X-Planes: Bell Textron X-76 SPRINT
Filed under: aerospace, history, engineering
This is the seventy-first article in the X-Planes series, following the X-1, the X-2, the X-3, the X-4, the X-5, the X-6, the X-7, the X-8, the X-9, the X-10, the X-11, the X-12, the X-13, the X-14, the X-15, the X-16, the X-17, the X-18, the X-19, the X-20, the X-21, the X-22, the X-23, the X-24, the X-25, the X-26, the X-27, the X-28, the X-29, the X-30, the X-31, the X-32, the X-33, the X-34, the X-35, the X-36, the X-37, the X-38, the X-39, the X-40, the X-41, the X-42, the X-43, the X-44, the X-45, the X-46, the X-47, the X-48, the X-49, the X-50, the X-51, the X-52, the X-53, the X-54, the X-55, the X-56, the X-57, the X-58, the X-59, the X-60, the X-61, the X-62, the X-63, the X-64, the X-65, the X-66, the X-67, the X-68, and the X-69 through X-75.
The X-76 carries two kinds of engine so that no one machine has to both lift it and push it fast. Two turboshafts lift it, a turbofan pushes it, and between those two modes its proprotors stop, fold and disappear [Parsch, DOD 4120.15-L Addendum] [The War Zone on the X-76]. Every engineering number this article can derive about the aeroplane follows from that division, and the most useful of them is that the turbofan’s certificated thrust sets a ceiling on how much drag the aircraft may carry at 400 knots, a ceiling that under the simplest model of how thrust falls with altitude is the same at every altitude, a result derived in The Jet Is a Drag Budget.
The X-76A designation was allocated on 20 October 2025 to Bell Textron for the Speed and Runway Independent Technologies programme, SPRINT, of the Defense Advanced Research Projects Agency, which is DARPA. Its row has an engine cell reading 2 GE CT7-8, PW308C+, a sponsor cell reading DARPA, and a description that the register marks as its compiler’s wording rather than as drawn from Department of Defense records [Parsch, DOD 4120.15-L Addendum]. The register is a compilation by Andreas Parsch published at designation-systems.net and not a Department of Defense publication.
Unmanned demonstrator for SPRINT (Speed and Runway Independent Technologies) program.
At this article’s date of 15 December 2025 that row was not public. It first appears in an archived copy of the register between 15 January and 1 February 2026 [Parsch, DOD 4120.15-L Addendum, as archived on 15 January 2026] [Parsch, DOD 4120.15-L Addendum, as archived on 1 February 2026], and DARPA announced the designation on 9 March 2026 [DARPA on the X-76]. The programme behind it was public, and in unusual depth. The solicitation of March 2023 is on the federal contracting portal with its proposers’ day slides, three budget justification books inside the date carry a programme entry, the federal award record holds three of the four first-phase contracts, and Bell’s patents describe stop-fold mechanisms of the kind the aircraft needs [SPRINT broad agency announcement] [SPRINT proposers day slides] [DARPA budget justification, fiscal year 2024] [DARPA budget justification, fiscal year 2025] [DARPA budget justification, fiscal year 2026] [Award HR001124C0325 to Aurora Flight Sciences] [Award HR001124C0326 to Piasecki Aircraft] [Award HR001124C0327 to Northrop Grumman] [US 10,526,068]. The article can therefore state the aeroplane’s envelope from the government’s documents and its engines from the register, and almost nothing else. The designation itself, and the founding-year reading of its number, are treated in the X-69 through X-75 article and are summarised here only where the aeroplane needs them.
This article treats the X-76 as an aircraft and not as a designation alone, because a vehicle exists and was being built after its critical design review. It has not flown and will not fly inside the dateline, so it is documentation-poor, and every section that would describe flight describes instead what the government asked for and what physics allows [DARPA on the X-76].
The Research Question
The programme states its question, and the solicitation and DARPA’s programme page state it in the same numbers. The solicitation asks for technologies that let an aircraft “cruise at speeds from 400 to 450 Knots, hover in austere environments, and transition between these modes of operation in a stable and time critical manner” [SPRINT broad agency announcement]. DARPA’s programme page, as it stood on 12 December 2025, gives the same pair of numbers, cruise from 400 to 450 knots at relevant altitudes and hover in austere environments from unprepared surfaces [DARPA SPRINT programme page, as archived on 12 December 2025].
The question is therefore runway independence at jet cruise speed, a hard one because the two halves want opposite rotors. Hover wants a large disk moving a large mass of air slowly, since the ideal power to hover falls as the square root of the disk area grows. High speed wants the opposite, a small, stiff propulsor whose blade tips stay subsonic when the aircraft’s speed is added to their rotation. A rotor big enough to hover efficiently is too big to cruise at 450 knots, and a propulsor fit for 450 knots is too small to hover efficiently. Bell’s 2025 paper states the same tension in one sentence, that hover requires significant power that can only be mitigated by larger diameter rotors, but that large diameter rotors become a detriment to achieving transonic flight [Schank et al. 2025].
Momentum theory states the hover half of that tension exactly. An ideal rotor system of total disk area $A$ lifting a weight $W$ in air of density $\rho$ needs an induced power
\[P_{\mathrm{ideal}} = \frac{W^{3/2}}{\sqrt{2 \rho A}}, \tag{1}\]so at fixed weight and density, doubling the disk area changes the ideal power by the factor
\[\frac{P_{\mathrm{ideal}}(2A)}{P_{\mathrm{ideal}}(A)} = \frac{1}{\sqrt{2}} = 0.707, \tag{2}\]a saving of 29 percent. The sizing section adds the figure of merit, the transmission loss and the wing download to this ideal, and quantifies the cruise half of the tension from the helical tip Mach number.
Two Propulsion Systems, Each Sized by One Flight Phase
The stop-fold answer is to stop asking one propulsor to do both jobs. The proprotors lift the aircraft in hover and pull it through conversion like those of any tiltrotor. At some airspeed the wing carries the weight, a separate jet takes over the thrust, and the proprotors are feathered, stopped, and folded back along their nacelles. The register’s engine cell is the physical form of that answer, two turboshafts and a turbofan. Engle and Sambell described the configuration in 1969 in terms that still fit, the rotors stopped in axial flow in a 120 to 200 knot range and the blades folded into streamlined pods, so that “the lift and propulsion systems can thus be optimized for their respective operating regimes” [Engle and Sambell 1969].
This article’s keystone is that sentence made quantitative. If each system is sized by one phase, then the turboshafts’ certificated power bounds what the aircraft can hover and the turbofan’s certificated thrust bounds what it can push at 400 knots. Neither bound needs the aircraft’s mass, wing or rotor diameter, which are not public, to be stated as an envelope. Both envelopes are derived below, and the most useful result is that the turbofan’s sea-level rating, with an assumed lapse factor, fixes the largest equivalent drag area the aircraft can carry at 400 knots, at every altitude in the solicitation’s band.
Why a Proprotor Cannot Simply Be Driven Faster
A conventional tiltrotor runs out of speed for two reasons that this article treats, and both are on the proprotor. The first is aeroelastic. A large, flexible proprotor on a flexible wing can couple its gyroscopic precession to the wing’s bending and torsion and go unstable, the instability called whirl flutter, and the speed at which it occurs falls as the wing is made thinner and less draggy [Acree et al. 1999] [Johnson 1974b]. The second is compressibility. A blade tip sees the aircraft’s forward speed and its own rotational speed combined, so the helical tip Mach number rises with airspeed even when the rotor turns no faster. A later subsection quantifies this second limit from the XV-15’s published rotor speed. The stop-fold configuration escapes both limits at once by removing the rotor from the airstream, and a 1972 full-scale wind tunnel test reported that effect, the stopped rotor eliminating the rotor, pylon and wing instability [The History of the XV-15 Tilt Rotor Research Aircraft].
The research question, then, is not whether a rotor can be stopped in flight, which was shown at full scale in a wind tunnel in 1972. It is whether an aircraft built around that idea, with existing engines and a flight control system that sequences the transition, can hover over an unprepared surface and then cruise at 400 knots, which no aircraft has done in the records this article consulted.
The Register Row and Its Engine Cell
The row has six cells and only the description is marked as the compiler’s. The date, the designation, the maker, the engines and the sponsor carry no mark and are, by the compiler’s scheme, drawn from Department of Defense records, while the whole description cell carries the class the compiler uses for wording that is not from Department records [Parsch, DOD 4120.15-L Addendum]. The engines are therefore the only configuration fact about this aeroplane in the public record that the compiler attributes to Department of Defense records, and they are engines of two kinds, two turboshafts and, on the reading taken below, one turbofan.
Two General Electric CT7-8 turboshafts are a helicopter powerplant. The CT7-8 series is the commercial member of the family whose military members are the T700 engines, the New Zealand regulator’s acceptance report recording that “the original CT7-1 turboshaft was a commercial derivative of the military T700 engine” [New Zealand type acceptance report for the CT7 series] and General Electric calling the line “the family of T700/CT7 turboshaft engines” [General Electric on the certification of new CT7-8 models, 2004]. In the copy of the register last updated on 23 August 2026, 23 other rows are powered by T700 or CT7 variants, and 20 of them are helicopters, two are the HC-144 transports with turboprop CT7s, and one is the X-49, a compound helicopter [Parsch, DOD 4120.15-L Addendum]. One PW308C is a business-jet turbofan of about 31 kilonewtons [Type-certificate data sheet for the PW308 series], and the New Zealand regulator’s acceptance report states that it “was developed for the Falcon 2000EX aircraft and is rated at 7002 lb. maximum takeoff thrust” [New Zealand type acceptance report for the PW308 series]. The two documents agree to within a pound, the European sheet’s 31.15 kilonewtons being 7,003 pounds. No other of its 539 rows pairs a turboshaft with a turbofan, every other cell naming more than one kind of engine or thruster belonging to a missile, a target or a satellite, and that pairing is what a stop-fold aircraft is [Parsch, DOD 4120.15-L Addendum].
The Plus Sign After the Turbofan Has Four Readings
The cell reads 2 GE CT7-8, PW308C+, and the trailing plus sign is not explained anywhere in the register. This article does not resolve it. It records the four readings that the evidence allows and the meaning of each.
The first reading is that the plus is part of a model name, and the register supports it. Two other rows end in a plus, the BQM-167A and the BQM-177A targets, both powered by a Microturbo Tri 60-5+ [Parsch, DOD 4120.15-L Addendum], and the Air Force’s fact sheet for the first gives its power plant as “1 MicroTurbo Tri 60-5+”, so in those rows the plus is part of the engine’s name [Air Force BQM-167A fact sheet, as archived on 11 November 2025]. Where the register combines two kinds of engine, a count and a second engine always follow the plus, as in 1 XJ400-CA-400 + 1 Solid Propellant and 1 Mark 104 Mod 3+ 1 Mark 72 Mod 1, and in this row nothing follows it.
The second reading is an improved PW308C. Pratt and Whitney Canada announced an enhanced PW308C in June 2011 for the Falcon 2000S, with changes to the combustor and fuel delivery [AviTrader on the enhanced PW308C]. A compiler or a source document might mark that variant with a plus, but none of the documents consulted does.
The third reading is the solicitation’s engine rule. The solicitation requires existing engines and permits off-the-shelf engines with minor upgrades that make no change to the engine core [SPRINT proposers day slides], and DARPA’s answers to proposers say that “modifications that include the engine core are not allowed” [SPRINT questions and answers]. A plus could mark such an upgrade. That is an inference from the rule’s existence and from nothing in the row.
The fourth reading is truncation. The plus could be the start of a combination whose second term was lost, an electrical machine or an auxiliary system for example. The register’s combination syntax makes this the least likely of the four, since every combination it prints continues after the plus with a count and a name.
Which engine count governs the turbofan is the same kind of question. The count 2 precedes the CT7-8 and nothing precedes the PW308C. The register’s other multi-type rows give a count for each type [Parsch, DOD 4120.15-L Addendum], so the cell, read literally, names two turboshafts and an unstated number of turbofans, and this article takes the turbofan count as one. That reading agrees with the published renderings. DARPA’s artist’s concept, released on 9 March 2026 and so after the dateline, shows one lit exhaust at the tail between two canted fins, with the folded blades lying along each wingtip nacelle [DARPA artist’s concept of the X-76], and a journalist’s description of the renderings agrees [The Aviationist on the X-76]. An artist’s concept is not an engineering drawing, and the reading depends on the register cell first and the picture second. The count matters, because the certificated PW308C is approved for multiple-engine installation only [Type-certificate data sheet for the PW308 series], a point taken up under Dependent Systems.
The Compiler’s Description Calls It Unmanned
The description calls the X-76 an unmanned demonstrator, and that word is not official. The solicitation explicitly left crewing to the proposer, saying that “the decision to have the SPRINT X-Plane as manned, unmanned, optionally piloted, etc. is left to the proposer” [SPRINT broad agency announcement]. Two documents inside the date are consistent with an uncrewed aircraft without saying so. The solicitation’s slides anticipate that “a flight termination system may be required if unmanned” [SPRINT proposers day slides], and the fiscal year 2026 budget book plans “ground station and human-machine interface development” [DARPA budget justification, fiscal year 2026]. A ground station is what an uncrewed aircraft is flown from, so the plans support the compiler’s word, as an inference. After the date, DARPA released one rendering of the X-76 that shows no cockpit glazing [DARPA artist’s concept of the X-76] and that journalists read as uncrewed and a second of a future operational aircraft described as optionally piloted [The War Zone on the X-76] [DARPA SPRINT programme page].
The Row Was Not Public at This Article’s Date
Three archived copies of the register bracket the row’s first public appearance. The copy of 10 December 2025 does not contain it [Parsch, DOD 4120.15-L Addendum, as archived on 10 December 2025], nor does the copy of 15 January 2026, and the copy of 1 February 2026 does. The row became public between 31 and 48 days after this article’s date, and 87 to 104 days after the allocation it records. Writing $t_{\mathrm{a}}$ for the allocation, $t_{\mathrm{d}}$ for this article’s date, $t_{\mathrm{pub}}$ for the row’s first public appearance and $t_{\mathrm{DARPA}}$ for the announcement,
\[t_{\mathrm{pub}} - t_{\mathrm{d}} \in [\,31,\ 48\,]\ \text{days}, \qquad t_{\mathrm{pub}} - t_{\mathrm{a}} \in [\,87,\ 104\,]\ \text{days}, \qquad t_{\mathrm{DARPA}} - t_{\mathrm{d}} = 84\ \text{days}. \tag{3}\]The compiler’s note on the row, read in the current copy, quotes DARPA’s statement that the out-of-sequence number is “a deliberate nod to the revolutionary spirit of 1776” [Parsch, DOD 4120.15-L Addendum], which is 84 days after this article’s date. This article uses the row as a fact about the aeroplane and dates every use of it. The X-69 through X-75 article measured this lag and treats the number’s meaning, and neither is revisited here.
Programme Origin, From the Solicitation to the Critical Design Review
The programme’s history can be told almost entirely from government documents, which is unusual for a vehicle that has not flown, and the documents disagree with each other and with the contractor in ways worth recording.
The Solicitation Set the Aeroplane’s Envelope Before Any Design Existed
DARPA’s Tactical Technology Office posted solicitation HR001123S0031 on Friday 10 March 2023, held a proposers’ day on 23 March, took abstracts until 31 March and proposals until 5 May, and expected to announce awards in September with work beginning in October [SPRINT proposers day slides]. The programme was joint from the first slide, with Headquarters, United States Special Operations Command, and its Special Operations Forces Acquisition, Technology and Logistics Center as partner, and the contracting officer’s representative to be that center’s deputy programme manager. The programme manager at the proposers’ day was Dr. Andrew Baker [SPRINT proposers day slides]. The programme page by December 2024 named Ian Higgins [DARPA SPRINT programme page, as archived on 24 December 2024], and the announcement of March 2026 gives his rank as commander, United States Navy [DARPA on the X-76].
The solicitation asked for two designs, not one. Each proposer had to size an Operational System to a representative mission and a Demonstrator X-Plane traceable to it, and only the demonstrator was to be built [SPRINT broad agency announcement]. The operational mission is specific. It carries a 5,000 pound payload in a notional cargo bay 30 feet long, 8 feet wide and 7 feet high, hovers out of ground effect at sea level on a 102 degree Fahrenheit day for take-off and at 4,000 feet on a 95 degree day mid-mission and for landing, flies two legs of 350 nautical miles at best-range speed, and dashes at maximum continuous power at 400 knots true airspeed as a threshold and 450 as an objective [SPRINT proposers day slides].
The demonstrator guidance is the closest thing to a specification of the X-76 that is public. It reads as follows in the slides.
| Attribute | Guidance |
|---|---|
| Gross take-off weight | 8,000 to 15,000 pounds, “weight range is not limiting” |
| Sustained speed | at least 400 knots true airspeed between 15,000 and 30,000 feet |
| Useful payload | at least 1,000 pounds, mainly for flight test instrumentation |
| Flight test endurance | 1.5 hours |
| Radius | at least 200 nautical miles |
| Load margins | minus 0.5 to plus 2 g |
| Design life | 500 hours, with DARPA’s demonstration expected to use 200 or fewer |
| Landing | 12 feet per second sink rate with no damage |
Three further rules shaped the configuration as much as any number. The X-plane had to use existing engines, and the government would not supply them. There was no disk loading, downwash or surface hardness limit, the proposer being asked instead to explain how the design meets the goal of runway independence. And the goal was first flight of the demonstrator no more than 42 months from contract award [SPRINT broad agency announcement]. The solicitation budgeted Phase 1A at the order of 15 million dollars, with 75 million dollars available for Phase 1 in total, and it allowed either a procurement contract or an other transaction. The answers DARPA posted on 30 March 2023 sharpen four of these rules [SPRINT questions and answers]. The Phase 1 money was 15 million dollars for Phase 1A and 60 million for Phase 1B, “a total split among performers”, matching the solicitation’s 75 million,
\[15 + 60 = 75\ \text{million dollars}. \tag{4}\]Engine modifications were allowed, but “modifications that include the engine core are not allowed”. A proposer could switch instruments between phases, an other transaction for Phase 1 and a regulation-based contract for Phase 2 being given as the example. And “the SPRINT X-Plane is not intended to transition to an operational system” [SPRINT questions and answers], which the budget books, describing a demonstrator that transitions for further risk reduction flight testing, do not contradict, since that transition is of the test aircraft and not to production [DARPA budget justification, fiscal year 2026].
Thirteen Offers and Four Awards, Three of Them in the Contract Record
The federal award record holds three first-phase contracts and states that each was competed with thirteen offers received. All three are cost-plus-fixed-fee research contracts under the solicitation’s number, described as Speed and Runway Independent Technologies, and the award notices posted to the contracting portal on 2 and 7 November 2023 [Award HR001124C0325 to Aurora Flight Sciences] [Award HR001124C0326 to Piasecki Aircraft] [Award HR001124C0327 to Northrop Grumman] [Award notice for HR001124C0326] [Award notice for HR001124C0325] [Award notice for HR001124C0327].
| Award | Recipient | Start | Obligated to date |
|---|---|---|---|
| HR001124C0326 | Piasecki Aircraft | 31 October 2023 | 4,944,700 dollars |
| HR001124C0325 | Aurora Flight Sciences | 1 November 2023 | 33,301,718 dollars |
| HR001124C0327 | Northrop Grumman | 1 November 2023 | 5,406,094 dollars |
DARPA’s programme page dates the programme’s entry into Phase 1 to 1 November 2023, which agrees with two of the three start dates [DARPA SPRINT programme page, as archived on 12 December 2025]. Bell announced its selection for Phase 1A on 27 November 2023 [Bell selected for SPRINT Phase 1A]. The Piasecki and Northrop Grumman contracts’ periods of performance end on 30 April 2024 [Award HR001124C0326 to Piasecki Aircraft] [Award HR001124C0327 to Northrop Grumman], the point at which the record shows their participation stopping.
Bell’s Instrument Is Not in the Contract Record
No contract, grant or indefinite-delivery vehicle from DARPA to any Bell entity for this programme appears in the award record, searched by programme name, by the phrases speed and runway and runway independent, and by recipient. The solicitation allowed an other transaction, and its answers allowed a different instrument in each phase [SPRINT broad agency announcement] [SPRINT questions and answers]. An other transaction is not a procurement contract, and no document read here states whether or how DARPA reports one to the award record, so the absence is consistent with Bell holding one. The point is inferred. Bell’s instrument, its value and its date are named in none of them, and the article’s statements about money are confined to what the record holds.
Phase 1B, and the Money the Record Allows Bell
Aurora’s contract carries both phases, and its modifications date the Phase 1B decision. The obligations before 24 May 2024 total 4,843,311 dollars, and modification P00006 on 24 May 2024 obligates 12,974,331 dollars, after which a further 15,484,076 dollars follow through February 2025 [Award HR001124C0325 to Aurora Flight Sciences]. That date agrees with DARPA’s statement that Aurora and Bell were awarded Phase 1B in May 2024 [DARPA SPRINT programme page, as archived on 12 December 2025] and with Bell’s release of 28 May 2024 [Bell awarded funding for SPRINT Phase 1B]. The contract’s total decomposes exactly into the three periods,
\[4{,}843{,}311 + 12{,}974{,}331 + 15{,}484{,}076 = 33{,}301{,}718\ \text{dollars}. \tag{5}\]The three recorded Phase 1A obligations sum to 15,194,105 dollars, Aurora’s pre-option figure with Piasecki’s and Northrop Grumman’s totals,
\[4{,}843{,}311 + 4{,}944{,}700 + 5{,}406{,}094 = 15{,}194{,}105 = 15{,}000{,}000 + 194{,}105\ \text{dollars}, \tag{6}\]which already exceeds the solicitation’s Phase 1A figure by 194,105 dollars before Bell’s share is counted. So the planning figure for Phase 1A was not a cap on what was obligated, and a figure that was not a cap for one sub-phase is weak evidence of a cap for the phase. The three recorded contracts together total 43,652,512 dollars, and if the solicitation’s 75 million dollars for Phase 1 had held as a ceiling,
\[B_{\mathrm{Bell}} \le 75{,}000{,}000 - (33{,}301{,}718 + 4{,}944{,}700 + 5{,}406{,}094) = 31{,}347{,}488\ \text{dollars}. \tag{7}\]Bell’s Phase 1 instrument could then not have exceeded 31,347,488 dollars, but the Phase 1A overrun shows that the premise of that bound did not hold for the first sub-phase, so it is stated as the bound the planning figure implies and not as an estimate of what Bell received.
Aurora’s contract has one more feature that this article records without interpreting. Its last modification, on 27 August 2025, carries the description DARPA RESEARCH PROJECT in place of the programme’s name, and its period of performance ends on 21 October 2025, the day after the X-76A allocation [Award HR001124C0325 to Aurora Flight Sciences].
The Other Finalist Also Chose Two Kinds of Engine
Aurora’s releases describe the design Bell beat, and it shares the X-76’s propulsion answer while differing in everything else. Aurora’s release of 20 May 2024 describes a “low-drag, fan-in-wing demonstrator that integrates a blended wing body platform” with three lift fans and “an uncrewed cockpit”, capable of 450 knots and using “existing engine solutions” [Aurora on its SPRINT design, May 2024]. Its release of 8 October 2024 is more specific. The demonstrator was uncrewed, with a 45-foot wingspan and a 1,000 pound payload, and “the propulsion system includes off-the-shelf turbofan and turboshaft engines that would power the vehicle to a maximum of 450 knots true airspeed” [Aurora on its SPRINT design, October 2024].
Both Phase 1B designs carried a turbofan and a turboshaft [Aurora on its SPRINT design, October 2024] [Parsch, DOD 4120.15-L Addendum]. One buried its lift fans in a blended wing and the other folded its rotors, and both answered the solicitation’s existing-engine rule with two kinds of engine rather than one convertible machine. It is the strongest evidence in the record that the separate-engine choice came from the rule rather than from Bell, evidence drawn from the competitor’s documents. The October 2024 release also gives the schedule as it then stood, with preliminary design review “scheduled for April 2025”, the phase running “through May 2025”, and “flight testing for the program is planned for 2027” [Aurora on its SPRINT design, October 2024].
Phase 2 Began in May, June or July 2025, Depending on Who Is Asked
Three sources inside or near the date give three months for the same decision. DARPA’s programme page reports that in June 2025 Bell “was awarded a contract for Phases 2 and 3” [DARPA SPRINT programme page, as archived on 12 December 2025]. Bell announced its selection for Phase 2 on 9 July 2025 [Bell to build the SPRINT X-plane]. DARPA’s announcement of March 2026 states that the programme began its second phase in May 2025 “following the downselect to Bell” [DARPA on the X-76]. These can all be true at once, a selection in May, an award in June and an announcement in July, but no document read here identifies which event each date names, and the article does not choose.
The contractor’s account of what Phase 2 includes changed between its releases. The release of July 2025 describes Phase 2 as “design, construction, ground testing and certification of an X-plane demonstrator” [Bell to build the SPRINT X-plane], while the solicitation had placed Phase 2 as critical design, build and ground test and Phase 3 as flight test [SPRINT broad agency announcement]. The certification in that sentence is airworthiness certification for an experimental aircraft, which the solicitation also placed in Phase 2, following a DARPA flight release tailored from the airworthiness handbook MIL-HDBK-516C [SPRINT broad agency announcement].
Two Contractor Datelines Are a Year Early on One Mirror
Textron’s investor-relations copies of two Bell releases carry datelines a year earlier than the releases themselves. The Phase 1B release, listed under 2024 and describing events of late 2023, is datelined “May 28, 2023” in its body [Textron copy of the Phase 1B release]. The Phase 2 release, listed under 2025, is datelined “July 9, 2024” [Textron copy of the Phase 2 release]. Bell’s own newsroom carries the correct dates, 28 May 2024 for the first and 9 July 2025 for the second [Bell awarded funding for SPRINT Phase 1B] [Bell to build the SPRINT X-plane], so the error lies in the mirror and not in the contractor’s record. It is recorded because a reader who took either dateline from the mirror would place Phase 1B before Phase 1A existed, and a chronology built from mirrored releases would be wrong by exactly a year in two places.
The Schedule Has Moved by at Least Eight Months
The solicitation’s goal of first flight within 42 months of contract award puts first flight by 1 May 2027 for an award on 1 November 2023. The slides’ notional schedule draws first flight in fiscal year 2027 for each notional performer [SPRINT proposers day slides]. As late as October 2024 the programme planned flight testing for 2027, by Aurora’s account of the schedule it was working to [Aurora on its SPRINT design, October 2024]. By July 2025 it planned flight testing in 2028, so the slip arose between those two dates, across the preliminary design review. Inside this article’s date, a DARPA spokesperson told Breaking Defense in July 2025 that the agency expected a completed demonstrator in 2027 and flight testing in 2028 [Breaking Defense on the Phase 2 selection], and DARPA’s March 2026 announcement, after it, gives early 2028 [DARPA on the X-76]. Taking early 2028 as 1 January 2028, the slip is at least eight months, and first flight would come at least 50 months after the Phase 1 award. Counting calendar months from the award,
\[t_{\mathrm{ff}}^{\mathrm{goal}} = t_{\mathrm{award}} + 42\ \text{months} = 1\ \text{May}\ 2027, \qquad t_{\mathrm{ff}}^{\mathrm{plan}} - t_{\mathrm{ff}}^{\mathrm{goal}} \ge 8\ \text{months}, \qquad t_{\mathrm{ff}}^{\mathrm{plan}} - t_{\mathrm{award}} \ge 50\ \text{months}, \tag{8}\]and the 42-month goal is 1,277 days. The programme’s other intervals set the pace against which that slip is measured, 236 days from the solicitation’s posting to the first award, and 719 days from that award to the designation’s allocation,
\[t_{\mathrm{award}} - t_{\mathrm{BAA}} = 236\ \text{days}, \qquad t_{\mathrm{a}} - t_{\mathrm{award}} = 719\ \text{days}. \tag{9}\]The comparison is between a goal and a plan, both of them documents, and implies no engineering difficulty, since no source read for this article describes one.
What Four Budget Books Said
DARPA’s research, development, test and evaluation budget justification books carry a programme entry for this programme in fiscal years 2024 through 2027, three of them published before 15 December 2025 and the fourth, of April 2026, after it [DARPA budget justification, fiscal year 2024] [DARPA budget justification, fiscal year 2025] [DARPA budget justification, fiscal year 2026] [DARPA budget justification, fiscal year 2027]. The entry sits in programme element 0603286E, Advanced Aerospace Systems, until fiscal year 2026, when it moves to programme element 0603468E, Advanced Complex Systems, project ACX-01, along with other programmes of the same project, among them the X-planes of the X-65 and X-68 articles.
The Same Year Reported Three Ways
Each book restates the earlier years, and the restatements are large. Figures are millions of dollars.
| Book for fiscal year, and its date | 2024 | 2025 | 2026 | 2027 |
|---|---|---|---|---|
| 2024, March 2023 | 22.663 | |||
| 2025, March 2024 | 22.663 | 36.866 | ||
| 2026, June 2025 | 13.024 | 41.998 | 55.200 | |
| 2027, April 2026, outside the date | 47.000 | 47.524 | 62.113 |
Fiscal year 2024 was requested at 22.663 million and executed at 13.024 million, a shortfall of 9.639 million in the programme’s first year [DARPA budget justification, fiscal year 2024] [DARPA budget justification, fiscal year 2026]. Fiscal year 2025 grew from a request of 36.866 million to an actual of 47.000 million in the latest book, about 27.5 percent more [DARPA budget justification, fiscal year 2025] [DARPA budget justification, fiscal year 2027]. Fiscal year 2026 was requested at 55.200 million and the latest book carries 47.524 million, about 13.9 percent less, though that figure is the current-year column of the latest book rather than an execution [DARPA budget justification, fiscal year 2026] [DARPA budget justification, fiscal year 2027]. The latest figures for fiscal years 2024 through 2027 sum to 169.661 million dollars. In millions,
\[22.663 - 13.024 = 9.639, \qquad \frac{47.000}{36.866} - 1 = 0.275, \qquad 1 - \frac{47.524}{55.200} = 0.139, \qquad 13.024 + 47.000 + 47.524 + 62.113 = 169.661. \tag{10}\]None of these figures is a contract value, and none of them can be reconciled with the award record’s 43.65 million without Bell’s missing instrument.
A Scaled Demonstrator Became a Demonstrator
The fiscal year 2024 book describes a programme that “culminates in the fabrication and flight test of a scaled demonstrator.” [DARPA budget justification, fiscal year 2024] The fiscal year 2025 book, a year later, drops the word scaled, and every later book follows it [DARPA budget justification, fiscal year 2025]. The solicitation itself had asked for “a scaled X-Plane demonstrator to validate the enabling technologies at a relevant size” [SPRINT broad agency announcement]. This article reads the change as vocabulary rather than concept, since the demonstrator guidance of 8,000 to 15,000 pounds was already a scale relative to the operational system and nothing in the plans changes, but it records the change because the word scaled is the only statement in any budget book about the aircraft’s size relative to anything.
The Transition Partner Changed Its Name Four Times
Each book names who the demonstrator transitions to, and each names it differently. The fiscal year 2024 book reads “military service members”, the 2025 book “military services”, the 2026 book “a DoD component” and the 2027 book “a Services component” [DARPA budget justification, fiscal year 2024] [DARPA budget justification, fiscal year 2025] [DARPA budget justification, fiscal year 2026] [DARPA budget justification, fiscal year 2027]. The 2027 book also rewrites the missions, adding contested logistics under attack and electronic warfare and dropping logistics support and the sentence that “the thresholds for speed and range have evolved with military strategy and mission needs” [DARPA budget justification, fiscal year 2027]. Special Operations Command is not named anywhere in the programme’s entries in any book, its only appearance being the books’ tables of contents, although it is named as the joint partner on every DARPA page and in the solicitation.
The Plans Describe an Aircraft Flown From a Ground Station
The plans lists are the closest thing to a schedule the books hold, and they read in sequence. The 2024 book plans conceptual design review “for multiple concepts” [DARPA budget justification, fiscal year 2024]. The 2025 book plans preliminary design review and the start of limited detailed and critical design [DARPA budget justification, fiscal year 2025]. The 2026 book, dated June 2025 and inside the date, plans the subsystems by name, “propulsion system, thermal management system, hydraulics, electrical system”, along with control law development, engineering drawing release, airworthiness certification, integration with the flight test facility, manufacture of the demonstrator, and “ground station and human-machine interface development” [DARPA budget justification, fiscal year 2026]. The 2027 book, outside the date, adds a structural proof load test, final software integration laboratory testing with simulated failures, and ground checkouts “including engine runs” [DARPA budget justification, fiscal year 2027].
A thermal management system appears by name in the subsystem list. This article cannot say why, and records only that an aircraft carrying at least three gas turbines, two of which may idle or shut down in cruise, has more than one heat source to manage.
Sizing From First Principles
Nothing about the X-76’s mass, wing, rotor diameter or drag is public at this article’s date, nor in any later document read for it. What is public is the solicitation’s envelope and the certificated ratings of the engines the register names, taken as two turboshafts and one turbofan. This section does not estimate the aeroplane. It derives what those engines can do for any aeroplane inside the envelope, which bounds the X-76 from both ends.
Every input is one of three kinds and the text names which. Engine ratings and masses are certificated figures from the type-certificate data sheets. The weight range, speed band and altitude band are the solicitation’s. Everything else is a named assumption, swept where a result depends on it, and the assumptions are the hover figure of merit, the transmission efficiency, the wing download, the thrust lapse factor, the helical tip Mach limit and the maximum lift coefficient. Results that depend on an assumption say so where they are stated.
The Symbols This Article Uses
| Symbol | Meaning | Unit |
|---|---|---|
| $W$ | gross weight | N |
| $m_0$ | gross mass, with $W = m_0 g$ | kg |
| $g$ | standard gravitational acceleration, 9.80665 | m/s² |
| $m_e$ | dry mass of the three engines together | kg |
| $\mu_e$ | engine mass fraction, $m_e / m_0$ | none |
| $P$ | installed shaft power of the two turboshafts at a stated rating | W |
| $P_h$ | shaft power required to hover out of ground effect | W |
| $P_{\mathrm{ideal}}$ | induced power of an ideal rotor system in hover | W |
| $P_F$ | thrust power of the turbofan, $F V$ | W |
| $\mathrm{FM}$ | rotor figure of merit in hover, assumed 0.75 | none |
| $\eta$ | transmission and accessory efficiency in hover, assumed 0.90 | none |
| $d$ | wing download as a fraction of weight, assumed 0.10 | none |
| $A$ | total disk area of the two proprotors | m² |
| $w$ | disk loading, $W / A$ | Pa |
| $r$ | radius of one proprotor | m |
| $v_h$ | induced velocity at the disk in hover | m/s |
| $\rho$ | air density | kg/m³ |
| $\rho_0$ | sea-level standard density, 1.225 | kg/m³ |
| $\sigma$ | density ratio, $\rho / \rho_0$ | none |
| $T$ | air temperature | K |
| $T_0$ | sea-level standard temperature, 288.15 | K |
| $p$ | air pressure | Pa |
| $p_0$ | sea-level standard pressure, 101,325 | Pa |
| $\Lambda$ | tropospheric temperature lapse rate, 0.0065 | K/m |
| $h$ | geopotential altitude | m |
| $R$ | specific gas constant of air, 287.05 | J/(kg·K) |
| $\gamma$ | ratio of specific heats of air, 1.4 | none |
| $a$ | speed of sound | m/s |
| $F$ | turbofan thrust at altitude and speed | N |
| $F_0$ | turbofan sea-level static thrust at a stated rating | N |
| $\varphi$ | the turbofan’s thrust lapse factor at cruise Mach number, swept 0.5 to 0.7 | none |
| $q$ | dynamic pressure, $\tfrac{1}{2} \rho V^2$ | Pa |
| $V$ | true airspeed | m/s |
| $f$ | equivalent flat-plate drag area | m² |
| $L$, $D$ | lift and drag | N |
| $M$ | flight Mach number, $V / a$ | none |
| $M_h$ | helical tip Mach number of a proprotor in axial flight | none |
| $\Omega$ | proprotor rotational speed | rad/s |
| $V_t$ | proprotor tip speed, $\Omega r$ | m/s |
| $V_s$ | wing stall speed | m/s |
| $S$ | wing reference area | m² |
| $C_L$ | lift coefficient, with $C_{L}^{\max}$ its maximum, assumed 1.6 | none |
| $E$ | lift-to-drag ratio, $L / D$ | none |
| $q_w$ | dynamic pressure of the fully developed hover wake | Pa |
| $\kappa$ | proprotor tip speed as a fraction of the XV-15’s airplane-mode tip speed | none |
| $\lambda$ | proprotor advance ratio in axial flight, $V / V_t$ | none |
| $N_e$, $N_r$ | turboshaft output speed and proprotor speed | rev/min |
| $\mathcal{G}$ | speed reduction from turboshaft output to proprotor, $N_e / N_r$ | none |
| $n_F$ | number of turbofans fitted | none |
| $t$ | a date, with $t_{\mathrm{a}}$ the allocation, $t_{\mathrm{d}}$ this article’s date, $t_{\mathrm{pub}}$ the row’s first public appearance, $t_{\mathrm{DARPA}}$ the announcement, $t_{\mathrm{BAA}}$ the solicitation, $t_{\mathrm{award}}$ the first Phase 1A award and $t_{\mathrm{ff}}$ first flight, goal or plan | date |
| $B_{\mathrm{Bell}}$ | the value of Bell’s Phase 1 instrument | dollars |
The Atmosphere
Every density and speed of sound below comes from the standard troposphere, the 1976 standard’s constants applied with the hydrostatic relation [U.S. Standard Atmosphere 1976 1976]. Below 11 kilometres,
\[T = T_0 - \Lambda h, \qquad p = p_0 \left( \frac{T}{T_0} \right)^{g / (\Lambda R)}, \qquad \rho = \frac{p}{R T}, \qquad a = \sqrt{\gamma R T}. \tag{11}\]The solicitation’s hover condition is 4,000 feet on a 95 degree Fahrenheit day [SPRINT proposers day slides], which the slides give as an altitude and a temperature without naming the kind of altitude, and which this article reads as a pressure altitude. Holding pressure on the standard profile and raising temperature to 308.15 kelvin gives a density of 0.9893 kilograms per cubic metre, a density ratio of 0.8076. Since induced power at fixed weight and disk area scales as the inverse square root of density, the hot-day condition costs
\[\sqrt{\frac{\rho_0}{\rho_{\mathrm{hot}}}} = \sqrt{\frac{1.225}{0.9893}} = 1.113, \tag{12}\]an 11.3 percent increase in induced power, before any loss of engine power with temperature, which this article does not model. The turboshafts’ hot-day lapse appears in none of the sources, so every hot-day result below is optimistic by that unmodelled amount.
The Installed Power and What It Hovers
The certificated CT7-8 delivers 1,879 kilowatts, 2,520 shaft horsepower, at its five-minute take-off rating and 1,523 kilowatts at maximum continuous, with a dry mass of 243.6 kilograms [Type-certificate data sheet for the CT7 series]. The register names the model as CT7-8 without a suffix [Parsch, DOD 4120.15-L Addendum]. The same data sheet lists the suffixed CT7-8 models from 1,845 to 2,009 kilowatts at take-off, so if the register’s name stands for the family rather than the base model, the installed power lies between about 2 percent below and 7 percent above the base figure,
Two engines give
\[P = 2 \times 1879\ \text{kW} = 3758\ \text{kW} \tag{14}\]at take-off and 3,046 kilowatts at maximum continuous.
Momentum theory gives the power to hover in terms of disk loading alone. An ideal rotor producing thrust $W(1+d)$ through a disk of area $A$ needs an induced power equal to that thrust times the induced velocity, and a real one needs that power divided by its figure of merit and by the drive system’s efficiency. With $w = W / A$,
\[P_h = \frac{W (1 + d)^{3/2}}{\mathrm{FM}\, \eta} \sqrt{\frac{w}{2 \rho}}. \tag{15}\]Setting $P_h$ equal to the installed power and solving for weight gives the heaviest aeroplane the two turboshafts can hover at a chosen disk loading,
\[W_{\max} = \frac{P\, \mathrm{FM}\, \eta}{(1 + d)^{3/2}} \sqrt{\frac{2 \rho}{w}}, \tag{16}\]and solving instead for disk loading at the solicitation’s heaviest weight gives the highest disk loading at which that weight can still hover,
\[w_{\max} = 2 \rho \left( \frac{P\, \mathrm{FM}\, \eta}{W (1 + d)^{3/2}} \right)^{2}. \tag{17}\]These depend on the three hover assumptions, and the table states them at the assumed values. None of the three is taken from a measurement of the X-76 or quoted from a report. The figure of merit of full-scale tiltrotor proprotors was measured at Ames Research Center’s outdoor facility in the 1980s, for the XV-15’s metal and composite blades and a model of the V-22’s [Felker et al. 1986a] [Felker et al. 1985], and the magnitude of the wing download for typical tiltrotor configurations is the subject of a review of that research [Felker 1988]. This article read those reports’ abstracts and one report’s text, and it does not quote a figure from them, because the measured values sit in plotted and tabulated data whose extracted text is not reliable. The assumed values are typical of that literature’s subject and are labelled as assumptions throughout. Weights are in pounds, disk loadings in pounds per square foot, and the power fraction is the share of the two engines’ take-off power needed to hover 15,000 pounds at sea level.
| Disk loading | Heaviest hover weight, sea level | Heaviest hover weight, 4,000 ft and 95 °F | Power fraction at 15,000 lb | Radius of each rotor at 15,000 lb |
|---|---|---|---|---|
| 10 | 35,358 | 31,775 | 0.424 | 4.71 m |
| 13.2, the XV-15’s | 30,775 | 27,657 | 0.487 | 4.10 m |
| 15 | 28,870 | 25,944 | 0.520 | 3.85 m |
| 20 | 25,002 | 22,469 | 0.600 | 3.33 m |
| 30 | 20,414 | 18,345 | 0.735 | 2.72 m |
| 60 | 14,435 | 12,972 | 1.039 | 1.92 m |
The XV-15’s disk loading of 13.2 pounds per square foot is its published figure, at a design gross weight of 13,000 pounds on two 25-foot proprotors [The History of the XV-15 Tilt Rotor Research Aircraft]. Each rotor’s radius follows from the total disk area shared by two equal rotors,
\[r = \sqrt{\frac{W}{2 \pi w}}. \tag{18}\]Two CT7-8s hover 15,000 pounds at sea level at any disk loading up to about 55.6 pounds per square foot, which corresponds to rotors of about 4.0 metres diameter each. Since the limit is proportional to density, on the solicitation’s hot day before engine lapse it falls to
\[w_{\max}^{\mathrm{hot}} = \sigma_{\mathrm{hot}}\, w_{\max} = 0.8076 \times 55.6\ \text{psf} = 44.9\ \text{psf}. \tag{19}\]At the XV-15’s disk loading they would hover about 30,800 pounds at sea level, twice the solicitation’s heaviest figure,
\[\frac{W_{\max}(w = 13.2\ \text{psf})}{15{,}000\ \text{lb}} = \frac{30{,}775}{15{,}000} = 2.05. \tag{20}\]Every hot-day weight in the table is the same fraction of its sea-level neighbour, because the heaviest hover weight scales as the square root of density at fixed power and disk loading,
\[\frac{W_{\max}(\rho_{\mathrm{hot}})}{W_{\max}(\rho_0)} = \sqrt{\frac{\rho_{\mathrm{hot}}}{\rho_0}} = \sqrt{0.8076} = 0.899, \tag{21}\]the hot day’s 10 percent penalty on hover weight before any engine lapse. The turboshafts are not the constraint on the X-76’s weight at any conventional tiltrotor disk loading. Either the aircraft is heavier than the solicitation’s guidance, which the guidance explicitly permits, or it hovers with a large power margin, or it hovers at a disk loading well above a conventional tiltrotor’s, and the engines alone cannot say which. Two observations favour the third. Folded blades must lie along their nacelles, and Bell’s patent on a stowed-blade clamp describes a blade “foldable to a stowed position extending substantially parallel to the pylon” [US 2021/0078695], so blade length is bounded by nacelle length. And the solicitation set no disk loading limit [SPRINT broad agency announcement]. Both are inferences about the X-76, not facts about it.
Disk Loading Is the Price of Runway Independence
The solicitation asks for hover over unprepared surfaces with personnel nearby and then declines to limit disk loading, downwash or surface hardness, asking the proposer to explain how the design meets the goal instead [SPRINT broad agency announcement]. Momentum theory makes the trade explicit. The induced velocity at the disk is
\[v_h = \sqrt{\frac{(1 + d)\, w}{2 \rho}}, \tag{22}\]and the fully developed wake below an ideal rotor moves at twice that. At sea level, the XV-15’s disk loading gives 16.8 metres per second at the disk and 33.7 in the wake. A disk loading of 20 gives 20.7 and 41.5, and a disk loading of 60 gives 35.9 and 71.8. The wake speed rises with the square root of disk loading. What the ground and a person standing on it feel is the wake’s dynamic pressure, and that has a cleaner form, since squaring twice the induced velocity cancels the density,
\[q_w = \tfrac{1}{2} \rho \left( 2 v_h \right)^2 = \tfrac{1}{2} \rho \cdot \frac{4 (1 + d)\, w}{2 \rho} = (1 + d)\, w. \tag{23}\]The fully developed wake’s dynamic pressure equals the rotor’s thrust per unit disk area, at any altitude and on any day. At the XV-15’s disk loading it is 695 pascals, 14.5 pounds per square foot, at a disk loading of 20 it is 1,053 pascals, and at 60 it is 3,160 pascals, 66 pounds per square foot. A stop-fold aircraft that shortens its blades to stow them pays for cruise speed in downwash, in exact proportion to the disk loading it accepts, and downwash is the quantity runway independence is about. The literature on outwash and its effect on people standing near a hovering aircraft is cited in the survey below, and one of its studies is titled for that question [Calvert and Wenren 2019], which this article cites for its title only.
The Jet Is a Drag Budget
The certificated PW308C produces 31.15 kilonewtons at its five-minute take-off rating and 31.13 kilonewtons at maximum continuous, at sea-level static conditions, with a dry mass of 623.5 kilograms [Type-certificate data sheet for the PW308 series]. How that thrust falls with altitude and speed is not in the data sheet or in any other source this article found. This article therefore models it in the simplest form consistent with turbofan behaviour, thrust falling with density at a fixed Mach factor,
\[F = F_0\, \sigma\, \varphi, \tag{24}\]and sweeps the factor $\varphi$ from 0.5 to 0.7 at cruise Mach numbers. That range is an assumption, not a measurement of this engine, and the results are stated across it.
In steady level flight thrust equals drag. Writing the aircraft’s total drag as the dynamic pressure times an equivalent flat-plate area, $D = q f$, and noting that the thrust available is an upper bound on the drag that can be carried,
\[f_{\max} = \frac{F}{q} = \frac{F_0\, \sigma\, \varphi}{\tfrac{1}{2} \sigma \rho_0 V^2} = \frac{2 F_0\, \varphi}{\rho_0 V^2}. \tag{25}\]The density ratio cancels, so the largest drag area the jet can push at a given true airspeed is the same at every altitude, to the extent that the lapse factor is. At 400 knots true airspeed the coefficient $2 F_0 / (\rho_0 V^2)$ is 1.200 square metres and at 450 knots it is 0.948. Across the swept lapse factor, the X-76 can carry at most 0.60 to 0.84 square metres of equivalent drag area at 400 knots, 6.5 to 9.0 square feet, and 0.47 to 0.66 square metres at 450 knots. That budget includes the induced drag of lifting the aircraft, so the parasite budget is smaller still. It must hold the fuselage, the wing, two nacelles with their folded blades, the tails and the inlet, which explains why the folded configuration has to be clean and why Bell has patented a chined spinner and blade fairings for the folded rotor, the abstract describing blades “folded down” in forward flight against fairings that cover them [US 12,030,623].
The same model gives the lift-to-drag ratio the aircraft must reach. Thrust equal to drag and lift equal to weight require
\[\left( \frac{L}{D} \right)_{\mathrm{req}} = \frac{W}{F} = \frac{W}{F_0\, \sigma\, \varphi}. \tag{26}\]At 15,000 pounds and the middle of the lapse range, the required ratio is 5.68 at 15,000 feet, 6.70 at 20,000, 7.97 at 25,000 and 9.55 at 30,000. At 8,000 pounds it is 3.03 at 15,000 feet and 5.09 at 30,000. The requirement rises with altitude because thrust falls with density while weight does not, so the bottom of the solicitation’s altitude band is where the turbofan most easily meets the speed requirement, and a heavy X-76 would most plausibly demonstrate 400 knots near 15,000 feet. The claim follows from the model alone. Turned around, the same relation gives the highest altitude at which a given lift-to-drag ratio still allows 400 knots, since level flight needs the density ratio to be at least
\[\sigma_{\min} = \frac{W}{F_0\, \varphi\, E}, \tag{27}\]which at 15,000 pounds and the middle of the lapse range is 0.595 for $E = 6$, 0.447 for $E = 8$ and 0.357 for $E = 10$, standard-atmosphere altitudes of about 16,700, 25,100 and 31,200 feet. A lift-to-drag ratio near 6 in the folded cruise configuration would confine a 15,000 pound X-76 to the bottom of the solicitation’s band, and the band’s top needs a ratio near 10.
The turbofan’s thrust power is comparable to the turboshafts’ shaft power. At 400 knots and 15,000 feet, at the middle of the lapse range,
\[P_F = F V = 31.13\ \text{kN} \times 0.6292 \times 0.6 \times 205.8\ \text{m/s} = 2.42\ \text{MW}, \tag{28}\]against 3.05 megawatts of maximum continuous shaft power from the two CT7-8s,
\[\frac{P_F}{P_{\mathrm{mcp}}} = \frac{2.42\ \text{MW}}{3.05\ \text{MW}} = 0.79. \tag{29}\]The aircraft thus carries two power sources of the same order and uses one at a time, the cost of having two propulsion systems and the reason Bell’s patents describe drive systems that let an otherwise idle lift engine contribute thrust in cruise through a pylon-mounted ducted fan [US 11,325,719], or that couple and decouple rotors and thrust fans through clutches in one gearbox [US 11,577,831]. Whether the X-76 does either has not been disclosed.
The Proprotor’s Speed Limit Forces the Rotor to Stop
A proprotor in axial flight sees its blade tip moving at its own tip speed and the aircraft’s speed at right angles, so the helical tip Mach number, the variable against which the advanced high-speed propeller programme measured its noise [Dittmar and Hall 1991], is
\[M_h = \frac{\sqrt{V^2 + V_t^2}}{a}. \tag{30}\]The XV-15 turned its 25-foot proprotors at 517 revolutions per minute in airplane mode and 589 in helicopter mode, tip speeds of 206.3 and 235.0 metres per second [The History of the XV-15 Tilt Rotor Research Aircraft]. The hover figure can be checked against a measurement. At sea level 235.0 metres per second is a tip Mach number of 0.69, inside the range of 0.60 to 0.73 over which a full-scale XV-15 rotor’s hover performance was measured, a range across which that test found “very little effect on rotor performance due to tip Mach number variations” [Felker et al. 1985]. The height-velocity envelope in that history’s appendix reaches about 300 knots true at 16,000 feet [The History of the XV-15 Tilt Rotor Research Aircraft], where its airplane-mode helical tip Mach number is 0.80. At the X-76’s speeds the same tip speed is no longer workable. At 400 knots and 15,000 feet it gives 0.90, and at 450 knots and 25,000 feet it gives 1.00, a tip that is sonic.
Holding the helical tip Mach number to a limit fixes the largest tip speed a proprotor may turn at,
\[V_t \le a \sqrt{M_{h,\max}^2 - M^2}, \tag{31}\]and taking 0.85 as that limit, which is an assumption, the XV-15’s airplane-mode tip speed is exceeded above 350 knots at 15,000 feet and above 318 knots at 25,000. To hold the limit at 450 knots and 25,000 feet the rotor would have to turn at about 61 percent of that tip speed, and at 400 knots and 15,000 feet at about 88 percent. And at an airspeed equal to the limit times the speed of sound no tip speed at all satisfies it,
\[V_{\mathrm{wall}} = M_{h,\max}\, a, \tag{32}\]which is 532 knots at 15,000 feet and 512 knots at 25,000. The objective of 450 knots is therefore not beyond the compressibility wall, but it is in the region where a proprotor must be slowed so far that its advance ratio is high and its thrust per unit of tip speed is poor. The two quantities make that concrete. The tip speed allowed as a fraction of the XV-15’s, and the advance ratio that results, are
\[\kappa = \frac{a \sqrt{M_{h,\max}^2 - M^2}}{V_t^{\mathrm{XV15}}}, \qquad \lambda = \frac{V}{\kappa\, V_t^{\mathrm{XV15}}}, \tag{33}\]which give $\kappa = 0.877$ and $\lambda = 1.14$ at 400 knots and 15,000 feet, and $\kappa = 0.607$ and $\lambda = 1.85$ at 450 knots and 25,000 feet. The XV-15 at its 300 knots ran at an advance ratio of 0.75, so the X-76’s objective asks a proprotor for two and a half times the advance ratio of the aircraft that proved the configuration. That, with whirl flutter, is the case for stopping the rotor rather than slowing it. Bell’s paper states the conclusion and not this arithmetic, that the stop-fold configuration can “make the rotor disappear” in cruise [Schank et al. 2025].
The Conversion Must Happen Where the Wing Can Fly
The rotor can only be stopped once the wing is carrying the whole weight and the jet the whole drag. The lower bound on the speed at which that is possible is the wing’s stall speed,
\[V_s = \sqrt{\frac{2\, (W/S)}{\rho_0\, C_{L}^{\max}}}, \tag{34}\]which at sea level, taking a maximum lift coefficient of 1.6, is 105 knots at a wing loading of 60 pounds per square foot, 122 at 80 and 136 at 100. The wing loading of the X-76 is not public and those three values are illustrative. The historical literature puts the stopping speed in the range that result implies. Engle and Sambell placed rotor stopping “in the 120 to 200-knot speed range” in 1969 [Engle and Sambell 1969], and the full-scale folding rotor tested in 1972 completed more than forty start and stop sequences at tunnel speeds up to 175 knots, making “smooth start/stop transitions” in about two seconds [Large Scale Wind Tunnel 1972]. The conversion corridor of a stop-fold aircraft is therefore a band bounded below by the wing, at the illustrative stall speeds between 105 and 136 knots, and above by the loads on a rotor being stopped and on blades being folded in a moving airstream, which the historical tests put between 175 and 200 knots, and a stopped blade at the wrong angle can go unstable in a way a turning blade does not, a full-scale test having found “violent dynamic instabilities” of a stopped blade that its author concluded were a type of stall flutter [White 1969].
The Engines Alone Are a Sixth of the Heaviest Aeroplane
On the one-turbofan reading, the three engines’ dry masses sum to 1,110.7 kilograms, 2,449 pounds, 487.2 kilograms of turboshaft and 623.5 of turbofan,
\[m_e = 2 \times 243.6 + 623.5 = 1110.7\ \text{kg}. \tag{35}\]As a fraction of gross mass,
\[\mu_e = \frac{m_e}{m_0} = \frac{1110.7\ \text{kg}}{6803.9\ \text{kg}} = 0.163 \quad \text{at 15,000 lb}, \qquad \frac{1110.7\ \text{kg}}{3628.7\ \text{kg}} = 0.306 \quad \text{at 8,000 lb}. \tag{36}\]Bare engines at 16 percent of gross mass, before transmissions, shafts, the fold mechanism, inlets and nacelles, put the X-76 at the heavy end of the solicitation’s range or above it. At the light end the bare engines alone would be almost a third of the aircraft. This is the article’s one line of evidence that the demonstrator is heavier than 15,000 pounds or close to it, an inference from certificated engine data and not a statement about the aircraft. The hover power margin is not a second line, because the section on installed power found that it is equally consistent with a heavier aircraft, a large power margin or a high disk loading, and that two observations favour the high disk loading. The turboshafts’ specific power and the turbofan’s static thrust-to-weight ratio are
\[\frac{1879\ \text{kW}}{243.6\ \text{kg}} = 7.7\ \text{kW/kg}, \qquad \frac{31.15\ \text{kN}}{623.5\ \text{kg} \times g} = 5.1, \tag{37}\]so the turbofan is the heavier of the two systems for the job it does, carrying the aircraft only in the one flight phase that a proprotor cannot reach. And the turbofan alone could not lift the aircraft. Its static thrust is a fraction of the weight at both ends of the solicitation’s range,
\[\frac{F_0}{W} = \frac{31.15\ \text{kN}}{66.72\ \text{kN}} = 0.47 \quad \text{at 15,000 lb}, \qquad \frac{31.15\ \text{kN}}{35.59\ \text{kN}} = 0.88 \quad \text{at 8,000 lb}, \tag{38}\]so even a jet vectored downward could not hover the X-76. The hover must be the rotors’, and the conversion is a hand-over between two systems rather than a change of attitude of one.
The Concept Is Older Than the Programme
Bell’s July 2025 release calls the aircraft that became the X-76 “a brand-new aircraft with the first-ever stop/fold technology” [Bell to build the SPRINT X-plane]. The aircraft is new, and the idea is at least sixty years older in the open literature, where a 1964 paper considered stopping a rotor in forward flight [Celniker et al. 1964] and a 1965 paper described a stowed-rotor concept for vertical and short take-off and landing [Leoni and Kaplita 1965], and the programme’s design choices make most sense read against what that literature found.
Bell Stopped and Folded a Full-Scale Rotor in 1972
The configuration was studied as a family of aircraft from the late 1960s. Engle and Sambell’s 1969 paper on folding-proprotor performance describes “moderate disc loading for efficient vertical lift and cruise speeds of 400 knots and beyond” [Engle and Sambell 1969]. DeTore and Gaffey’s paper on the stopped-rotor variant of the proprotor aircraft was presented in 1969 and published in 1970 [Detore and Gaffey 1969] [DeTore and Gaffey 1970], and a paper on the stability and control of a tilt-fold-proprotor aircraft followed the same path in 1970 and 1971 [Nicholson and Tiller 1970] [Tiller and Nicholson 1971], all cited here for their titles only. A wind tunnel test of the conversion process of a folding tilt rotor, using an unpowered semispan model, is also from 1971 [Magee and Taylor 1971], again cited for its title.
In February 1972 a folding version of Bell’s 25-foot proprotor was tested in the 40 by 80 foot wind tunnel at Ames Research Center, in a programme jointly funded by the National Aeronautics and Space Administration, the Army and the Air Force with Bell as hardware contractor. The XV-15’s official history records that the stop-fold tilt rotor “eliminated the rotor/pylon/wing aeroelastic instability by stopping the rotor while in the airplane configuration”, that the blades were folded back along the nacelle to cut their drag, and that “a convertible engine was used to produce the jet thrust” [The History of the XV-15 Tilt Rotor Research Aircraft]. The test report records more than forty start and stop sequences, with smooth transitions in about two seconds at tunnel speeds up to 175 knots [Large Scale Wind Tunnel 1972].
And the history records why the idea was then shelved. The stop-fold tilt rotor “had the additional penalties of the increased complexity and increased weight of the stop/fold mechanism, and, with the lack of a developed convertible engine, it was put aside as a potentially feasible concept that would require further advancements to be an effective contender” [The History of the XV-15 Tilt Rotor Research Aircraft]. Two of the three obstacles named in that sentence are obstacles the X-76 accepts, weight and complexity, and the third is one it goes around.
The Convertible Engine Was the Missing Piece and the X-76 Does Without It
For two decades after 1972 the folding tiltrotor’s literature was largely a propulsion literature, because a single engine that could drive proprotors in hover and produce jet thrust in cruise was what the concept was thought to need. DARPA was in it from the start. A DARPA and National Aeronautics and Space Administration programme to demonstrate a convertible turbofan-turboshaft engine began on 13 May 1981, using a modified TF34-GE-400, for an engine able to power a rotorcraft “in vertical flight and in horizontal flight up to approximately .85 Mach number” [Bellin and Brooks 1983]. A study of the same period found that the fold tilt rotor needed a convertible engine giving thrust to Mach 0.75 and shaft power to proprotors in hover, and identified a torque converter as the coupling that would let the fan be engaged and disengaged smoothly [Gill and Sauer 1983].
The engine was built and run. A report of 1988 describes a convertible engine with variable inlet guide vanes that ran stably and smoothly in turbofan, turboshaft and dual modes, the last combining fan and shaft power, with fuel consumption in turboshaft mode higher than a dedicated turboshaft’s because of fan-tip churning [McArdle 1988a]. Its conclusion bears most directly on the X-76. Its revised mission analyses for a 400-knot rotorcraft concluded that convertible engines, rather than separate lift and cruise engines, would give a smaller, lighter craft with lower fuel use and lower direct operating cost.
The X-76 uses separate lift and cruise engines, the configuration that analysis judged heavier. The solicitation explains why, as far as a document can. It required the demonstrator to “be based on existing engine(s)/propulsion system”, allowed only minor upgrades without core changes, and gave its reason, “to ensure the engine or propulsion system development does not delay the overall X-Plane flight demonstration” [SPRINT broad agency announcement]. No convertible engine of this class is in production in any record read here, so the rule excluded the configuration the earlier literature preferred. The competitor’s documents support this reading. Aurora’s Phase 1B design was a fan-in-wing aircraft, a configuration unlike Bell’s in every structural respect, and it too carried “off-the-shelf turbofan and turboshaft engines” [Aurora on its SPRINT design, October 2024], so both finalists answered the rule the same way. The engine mass fraction derived above is the price, and the solicitation accepted it for schedule. That causal reading is this article’s inference, and the solicitation also states that the operational system “may include an engine/propulsion system that is envisioned in the future”, which leaves the convertible engine open for the aircraft the X-76 is meant to inform.
Folding Tiltrotor Demonstrators Were Proposed in 1985 and 1986
A folding tiltrotor demonstrator was proposed twice in the mid-1980s and never built. Gleiter’s 1985 paper argued that the folding tiltrotor offered advantages “for missions requiring long endurance combined with a speed capability in excess of 400 knots”, reported that development had begun in 1967 with “no significant technical obstacles”, and proposed a demonstrator on either the V-22 or the S-3A powered by the convertible CTFS-34 engine [Gleiter 1985]. A study a year later at the National Aeronautics and Space Administration considered three demonstrator candidates, the V-22 with a convertible TF34, a modified S-3A with the same engines, and the XV-15 with a conceptual turbofan coupled through a torque converter [Eisenberg and Bowles 1986]. Every one of those proposals depended on a convertible engine. The X-76 is the first folding tiltrotor demonstrator in the records read here to be funded through to manufacture, and it is being built without one [DARPA budget justification, fiscal year 2026] [DARPA on the X-76].
DARPA Paid for a Stop-Fold Study in 2008
The federal award record holds a DARPA contract titled STOP FOLD TILT ROTOR STUDY, awarded on 30 May 2008 to the Bell Boeing Joint Project Office for 584,557.50 dollars on a cost-sharing basis, extended at no cost to 31 March 2009, with one offer received [Award HR001108C0077 for a stop fold tilt rotor study]. No report from that study was found. It sits between the 1980s demonstrator proposals and Bell’s earliest stop-fold patent filings, and it shows that the agency now sponsoring the X-76 had paid for the configuration’s study almost fifteen years before its solicitation.
Bell’s patent record dates the company’s sustained work. The earliest Bell filing found on in-flight blade folding has a priority date of 15 June 2010 and describes a foldable rotor system with a blade fold actuator and a swashplate that changes blade pitch [CA 2802389]. A cluster of filings with a priority date of 2 December 2014 describes the transition mechanism itself, a gimbal lock that enables and disables the rotor’s gimballing freedom and a blade stop assembly whose arms extend in non-rotary flight [US 10,526,068], a cam that locks the gimbal and the blade cuff together [US 10,336,447], and a fold mechanism driven through the swashplate and pitch links [US 11,235,858]. The dates are consistent with Bell’s July 2025 release, in which its engineering vice president calls the stop-fold aircraft an achievement Bell had been working towards for over 10 years [Bell to build the SPRINT X-plane].
Dependent Systems
Every subsystem below is described from a certificate, a solicitation, a patent or a contractor’s paper, and none from a description of the X-76 itself, because none is public.
The Turboshafts
The CT7-8 was approved by the Federal Aviation Administration on 29 September 2000 under type certificate E8NE [New Zealand type acceptance report for the CT7 series], General Electric announcing the certificate on 10 October 2000 for an engine selected for the 25,000-pound-class Sikorsky S-92 [General Electric on the CT7-8 certificate, 2000]. The European Union Aviation Safety Agency’s data sheet gives its certification date as 20 January 2003, a date taken over from a national approval that preceded the agency, with its basis in that American certificate, and the data sheet gives its output shaft speed as 21,945 revolutions per minute at its principal ratings [Type-certificate data sheet for the CT7 series]. That speed fixes the size of the reduction the drive system must make, since a proprotor of radius $r$ turning at tip speed $V_t$ runs at
\[N_r = \frac{60\, V_t}{2 \pi r}, \qquad \mathcal{G} = \frac{N_e}{N_r} = \frac{2 \pi r\, N_e}{60\, V_t}. \tag{39}\]At the XV-15’s own rotor speeds the reduction would be 37.3 in hover and 42.4 in airplane mode. For a 15,000 pound X-76 at the XV-15’s hover tip speed of 235 metres per second, the rotor radii of the hover table give a proprotor speed of 547 revolutions per minute and a reduction of 40.1 at the XV-15’s disk loading, 674 and 32.6 at a disk loading of 20, and 1,167 and 18.8 at a disk loading of 60. A small stowable rotor needs a smaller reduction, a weight saving in the gearbox that partly offsets the weight of the fold, and like every statement here about the X-76’s rotor it depends on a disk loading that is not public. The data sheet read is issue 10, dated 19 December 2025, four days after the article’s date, and the base model’s ratings and mass quoted here are those of that issue. A turboshaft of this family is a natural choice for the solicitation’s existing-engine rule, being the commercial counterpart of the T700 engines, which with the CT7 power 20 of the 47 rows whose basic mission symbol is H in the copy of the register last updated on 23 August 2026. Whether the X-76’s two turboshafts run in cruise, idle, or shut down is not public, and the answer matters for fuel, for restart reliability before the rotors are unfolded, and for the thermal management system the budget book names.
The Turbofan, and a Certificate That Requires Two of It
The PW308C’s primary certificate is Transport Canada’s E-31, which the New Zealand regulator validated on 18 October 2007 [New Zealand type acceptance report for the PW308 series], and the European data sheet read here is that agency’s validation. That sheet states that “the PW308A and PW308C engines are approved for multiple engine installation only” [Type-certificate data sheet for the PW308 series]. It also records that the PW308C is normally used at a reduced take-off thrust of 3,113 decanewtons with an automatic increase to its full rating if the other engine fails. Both are features of a certificate written for a twin-engine business jet. If the X-76 carries one PW308C, as the register cell read literally and the renderings suggest, its installation lies outside an assumption underlying the civil certificate. The mismatch is not a defect, because the X-76 is an experimental aircraft flown under a DARPA flight release and not a civil type, and DARPA told proposers that engine certification “whether commercial or military does not matter as long as certification documents are available to substantiate whatever airworthiness method is chosen” [SPRINT questions and answers]. But it means the engine’s certification basis does not cover its installation, and whatever the civil certificate takes for granted about a second engine has to be substantiated another way. This reading is inferred from the data sheet and the cell, and no document consulted states the number of turbofans fitted.
The Drive System in Bell’s Patents
The budget book’s subsystem list names a propulsion system, a thermal management system, hydraulics and an electrical system, and no drive system [DARPA budget justification, fiscal year 2026]. Bell’s patents describe several. One couples one or more rotor systems and one or more thrust fans through a combined gearbox with clutches, so that rotors and fans can be engaged in sequence through the transition [US 11,577,831]. One lets a normally idle lift engine drive a pylon-mounted ducted fan for extra thrust once the blades are folded [US 11,325,719]. One routes drive shafts through the wing to the rotor on the pylon [US 2023/0331393]. A patent describes an embodiment and claims a right, and it does not say what was built. Whether the X-76 has a drive system of any of these kinds is not public.
The Fold Mechanism
The transition has more locked states than a conventional tiltrotor has, and Bell’s filings describe each lock. A rotor-blade assembly in a 2023 filing has “a lock system to enable and disable a folding degree of freedom and a pitching degree of freedom” [US 2025/0100674], and a companion filing describes a blade position control system that selectively restricts pitch and fold through a multilobe component moved by an actuator [US 2025/0100680]. A 2018 method folds the blades of a tiltrotor from an inverted-Y rotor position, unlocking and restraining each blade in turn [US 10,858,094], and a 2019 filing clamps the stowed blade pneumatically along the pylon [US 2021/0078695]. A 2020 filing shapes the blade tip to cut drag when folded [US 11,643,195], and a 2020 filing applies the stop-fold rotor to a tail-sitter instead of a tiltrotor [US 2021/0253239]. Taken together the filings show a decade of work on the locks, the stow and the folded drag, which are the three things the 1972 test showed were possible and did not make light.
Control Through Conversion
The solicitation’s flight test checkouts require the transition in both directions to be controlled at maximum design gross weight, with handling qualities to Level 1 desired and Level 2 required by the military flying qualities handbook and hover manoeuvres judged against the rotorcraft handling qualities specification’s mission task elements [SPRINT proposers day slides], those being MIL-HDBK-1797 [MIL-HDBK-1797, Flying Qualities of Piloted Aircraft] and ADS-33E-PRF [ADS-33E-PRF, Handling Qualities Requirements for Military Rotorcraft]. The slides write the latter as “ADS-PRF-33”, which this article reads as the same Army specification. The airworthiness basis is MIL-HDBK-516C [MIL-HDBK-516C, Airworthiness Certification Criteria]. Bell’s paper on the sled test describes fly-by-wire transition controls that automatically manage each step of the transition from proprotor flight to jet flight and back [Schank et al. 2025]. The conversion of a stop-fold aircraft is a sequence of discrete events, feathering, stopping, indexing, locking and folding, and its reverse, each of which changes the aircraft’s mass distribution and drag. Such a sequence is a control problem for software and not for a pilot’s hands, which is consistent with an uncrewed demonstrator, as an inference.
The structural guidance is modest because the demonstrator is not a fighter. The solicitation asks for load margins from minus 0.5 to plus 2 g, a 500-hour design life, and a 12 feet per second sink rate at landing without damage [SPRINT broad agency announcement]. The fiscal year 2027 book adds a structural proof load test to verify that the built aircraft matches its structural design predictions [DARPA budget justification, fiscal year 2027], a plan published after the dateline.
The Contractor Overstates Bell’s Designation History
Bell’s March 2026 release claims that the company “has pushed the known boundaries of flight through pioneering high speed and vertical lift aircraft from the X-1 to the XV-3 and XV-15” [Bell on the X-76], and its Phase 1A release of November 2023 called the X-1 and the XV-15 “memorable X-planes” [Bell selected for SPRINT Phase 1A]. The XV-3 and XV-15 are not research designations. They belong to the convertiplane sequence, mission letter V with the experimental status prefix X, and the designating instruction states that a design number “identifies major design changes within the same basic mission” and stands to the right of “the basic mission or vehicle type symbols” [Department of the Air Force Instruction 16-401, 2020]. Under that rule, which the X-67 article examined, the V sequence is a different count from the research series. Bell’s research designations are eight, the X-1, X-2, X-5, X-9, X-14, X-16, X-22 and now the X-76. The X-76 is Bell’s first research designation since the X-22, and its only research designation for a rotorcraft that converts by stopping its rotors [Wikipedia, List of X-planes]. The releases’ framing is a heritage claim, and on its own terms a fair one, since the XV-3 made the first full in-flight conversion from helicopter to airplane mode on 18 December 1958 [The History of the XV-15 Tilt Rotor Research Aircraft]. It is recorded here only because it uses X-plane for a designation the series does not count.
The Flight Test Record Is Empty
Nothing has flown. At the article’s date Bell had been selected for Phase 2, which the solicitation placed after a preliminary design review, the fiscal year 2026 plans placed the programme in critical design, and a DARPA spokesperson had told the press that the agency expected a completed demonstrator in 2027 and flight testing in 2028 [Breaking Defense on the Phase 2 selection].
The Sled Test and the Wind Tunnel Are Ground Tests
Bell’s two risk reduction tests are the only test data the programme has reported, and both are ground tests. In late 2023 a track-guided test vehicle ran on the 10-mile High Speed Test Track at Holloman Air Force Base, integrating “multi-mode propulsion, folding proprotors, and fly-by-wire transition controls” [Schank et al. 2025] [Bell awarded funding for SPRINT Phase 1B]. Bell’s paper on it claims “the first known powered prop-to-jet and jet-to-prop transition”, a narrower and more defensible claim than first-ever stop-fold technology, since the 1972 test stopped and folded a rotor in a tunnel but did not carry a whole powered vehicle through the transition. In 2024 a wind tunnel programme at the National Institute for Aviation Research at Wichita State University “validated the stability and control of the aircraft through the rotor fold and unfold sequence in flight” [Bell completes stop-fold wind tunnel testing], the release being dated 4 December 2024. Neither result is published in numbers in any document consulted.
Comparison With Ground Prediction
There is no flight result to set beside any ground prediction, because the X-76 had not flown by 15 December 2025. What the record holds is prediction of three kinds. The first is the government’s specification, which asks for at least 400 knots true airspeed between 15,000 and 30,000 feet, a gross take-off weight of 8,000 to 15,000 pounds, and hover out of ground effect at 4,000 feet on a 95 degree Fahrenheit day [SPRINT proposers day slides]. The second is the contractor’s ground testing, the sled run at Holloman Air Force Base and the wind tunnel programme at Wichita State University, described above and not reported in numbers. The third is this article’s derivation from certificated engine ratings and the solicitation’s envelope, set out in Sizing From First Principles.
The nearest thing to a comparison of prediction with result is historical, and it was made on the ground. Engle and Sambell placed rotor stopping in the 120 to 200 knot speed range in 1969 [Engle and Sambell 1969], and the full-scale folding rotor tested in 1972 was stopped and started at tunnel speeds up to 175 knots [Large Scale Wind Tunnel 1972], inside that range. Both are analytical or wind tunnel results, and neither involved a whole aircraft in flight. Bell’s sled test carried a powered vehicle through the transition on rails [Schank et al. 2025], a step closer to flight and still a ground test.
The predictions this article makes are stated so that flight could check them. They are a drag-area ceiling of 0.60 to 0.84 square metres at 400 knots, from the relation for $f_{\max}$, a heaviest hover weight of about 30,800 pounds at sea level at the XV-15’s disk loading, from the relation for $W_{\max}$, and a conversion band bounded by illustrative stall speeds of 105 to 136 knots, from the stall relation, and by the 175 to 200 knots of the historical tests. Each depends on assumptions listed under Where the Framing Breaks Down, and none has been tested against the aircraft. The fiscal year 2027 budget book plans a structural proof load test to verify that the built aircraft matches its structural design predictions [DARPA budget justification, fiscal year 2027], which postdates the article and is itself a ground test. The comparisons a first flight would make possible follow.
What Would Be Compared With What
When the X-76 flies, four of this article’s derivations become testable. Its hover gross weight and rotor diameter fix its disk loading, which can be set against the hover envelope above. Its demonstrated cruise speed and altitude, with its weight, fix a required lift-to-drag ratio, and its level-flight thrust setting, if published, fixes its equivalent drag area against the ceiling of 0.60 to 0.84 square metres at 400 knots that the relation for $f_{\max}$ gives. Its conversion speed can be set against the band from wing stall to between 175 and 200 knots that the historical tests and the stall relation together suggest. And its maximum demonstrated speed can be set against the solicitation’s threshold of 400 and objective of 450 knots, the gap between which is the gap between a proprotor that must be slowed and one that must be stopped.
What the Data Changed Awaits a First Flight
If the X-76 meets its threshold, the first thing it settles is not speed but the conversion. That a proprotor aircraft can hover and that a jet can push a clean airframe to 400 knots are both established separately. No record consulted shows the sequence between them in flight, with a real wing, a real jet, and blades being stopped and folded in a real airstream at the low end of the conversion band, where the stopped-blade instabilities of the 1960s tests were found. A clean conversion in both directions would retire the risk that shelved the concept in 1972 other than the convertible engine, and the convertible engine would then become the remaining argument for the operational aircraft.
If it meets the objective of 450 knots, it would show that the folded configuration is clean enough to fit the drag budget a single business-jet turbofan sets, 0.47 to 0.66 square metres of equivalent drag area at 450 knots by the relation for $f_{\max}$, the article’s quantitative claim about the configuration and the one most sensitive to how well the folded blades are faired.
What it may fail to influence is the procurement it is meant to inform. The budget books’ transition partner moved from service members to services to a component, and Special Operations Command, the joint partner on every DARPA page, is named as transition partner in none of them. The literature records two folding tiltrotor demonstrators proposed in the 1980s and neither built, and the configuration’s history is one of feasibility repeatedly shown and repeatedly not bought. The X-76 changes that history only if someone buys what it demonstrates, a decision no flight test makes.
The Contemporary Literature
| Cluster | Records |
|---|---|
| Stopped, folded and stowed rotors | 93 |
| The tiltrotor and its relatives | 1,198 |
| Proprotor whirl flutter and tiltrotor aeroelasticity | 130 |
| High-speed propellers and tip compressibility | 191 |
| High-speed vertical lift as a class | 882 |
| Hover, wake, downwash and the surface | 277 |
| Conversion between hover and forward flight | 42 |
| Turboshafts, turbofans and the convertible engine | 383 |
| Rotorcraft conceptual design and sizing | 73 |
| The missions the solicitation names | 44 |
| Research aircraft and their flight test | 99 |
| Total | 3,412 |
There is almost no literature on the X-76 itself, and the one paper on its direct ancestor is the contractor’s. Bell’s 2025 paper on the stop-fold sled test is the only technical publication in the survey about the programme’s hardware [Schank et al. 2025]. What the survey maps is the large literature the X-76 sits in, being the stopped and folding rotor, the tiltrotor and its aeroelastic and compressibility limits, high-speed vertical lift as a class, hover physics and the downwash at the surface, conversion between modes, the propulsion families and the convertible engine, rotorcraft conceptual design, the missions the solicitation names, and the practice of research aircraft and their flight test.
The survey cites 3,412 research records, 17 of them the research primaries described in The Source Base and 3,395 drawn from a bibliographic index of the journal and conference literature and from the National Aeronautics and Space Administration’s reports server. Each record appears in one cluster only. 714 of them, 20.9 percent, are report primaries under the identifier rule set out under The Definition of Primary, and the 3,371 records that carry a year run from 1949 to 2027 with a median of 2007.
The clusters are uneven and the unevenness is informative. The tiltrotor literature is the largest and the conversion literature the smallest. The configuration the X-76 embodies has a literature with a gap in the middle. Of the 50 titles in the survey that name a folded, folding, stopped or stowed rotor, blade or propeller, 35 date from 1965 to 1999, none from the 2000s, and 15 from 2010 on, 10 of them from 2021 on. Titles that join a folded or stowed rotor to a tiltrotor or proprotor number 15, 14 of them from 1969 to 1992, a span that holds the convertible engine programmes and the V-22’s blade fold for stowage, and one from 2011, and the stopped-rotor revival of the 2020s is led by the high-speed vertical take-off and landing work this programme belongs to [Young 2024].
What the Literature Establishes, and Where It Is Moving
Read as a whole rather than cluster by cluster, the literature makes four points that bear on the X-76, and it is silent on a fifth.
First, the stopped rotor has an experimental base from the 1960s and 1970s and a revival in the 2020s, and the revival is divided. The early work found that a stopped blade can go violently unstable at some combinations of shaft and pitch angle [White 1969], and that a full-scale folding proprotor could be stopped and started in about two seconds [Large Scale Wind Tunnel 1972]. The contemporary reassessment by Brown and Ahuja reviews why the historical stopped-rotor experiments were not successful and argues that “with modern technologies, materials, and analysis tools” a low disc-loading rotor can be used “not only for efficient VTOL but also for efficient cruise” [Brown and Ahuja 2023a], where VTOL is vertical take-off and landing. Young’s survey of novel concepts for flight at 400 knots or more, written at the National Aeronautics and Space Administration, discusses “two stopped-rotor concepts and two non-stopped-rotor concepts” [Young 2024]. So the current literature splits between keeping the stopped rotor in the airstream as a lifting surface and removing it from the airstream altogether, and the X-76 belongs to the second branch, as the contractor’s sled-test paper states [Schank et al. 2025]. Work on the flight dynamics of stopped-rotor aircraft continues at small scale, judging by one paper’s title [He et al. 2022].
Second, whirl flutter is a large and recent experimental subject, and every result cited here is about making a turning proprotor survive at higher speed. Of the 209 titles in the survey that name whirl flutter, 105 are dated 2020 or later. The Maryland Tiltrotor Rig is a Froude-scaled, 4.75-foot, semispan flutter rig first tested to 100 knots in the Navy’s Carderock tunnel [Tsai et al. 2024]. Its swept-tip blades, swept 20 degrees aft from 80 percent of radius, showed “higher wing chord damping using swept-tip blades in freewheel conditions” [Sutherland et al. 2024], and the comprehensive analysis matched wing beam damping well while underpredicting chord damping and missing the effect of powered operation [Gul and Datta 2024]. Run to 200 knots in freewheeling airplane mode, the model “remained flutter-free up to 200 knots”, but its “chord damping showed signs of a sudden drop after 175 knots” [Akinwale and Datta 2023], and a 2026 analysis of the same rig’s free decays found that damping falls with response amplitude, “a trend missed by conventional linear estimation methods” [Simmons and Riso 2026]. The European Advanced Testbed for Tiltrotor Aeroelastics, called ATTILA, a Froude-scale semispan model of a civil tiltrotor’s wing and proprotor, found the wing torsion mode “displaying a sharp trend towards negative damping at higher speeds” and an unexpected contribution from stiction in the blade pitch mechanism [van ‘t Hoff et al 2024], which a 2026 analysis could reproduce only by modelling friction in the joints [De Vita et al. 2026]. A design study found that replacing one large wingtip rotor with two of half the disk area “pushed the instability speed by more than 100%” [Gul and Yeo 2025]. The standing reviews are Reed’s of 1965 [Reed 1965] and Kunz’s of 2002 and 2005 [Kunz 2002] [Kunz 2005], the latter cited for their titles. This literature is the measure of what the X-76 avoids. The stop-fold configuration’s premise is that removing the rotor from the airstream is easier than making it stable there, and a body of current work in which a scaled rig is flutter-free to 200 knots but losing chord damping above 175 is the evidence for that premise. Scaled speeds do not transfer to full-scale speeds without the rig’s scaling laws, and this article does not attempt the transfer.
Third, the convertible engine, the missing piece of 1972, has had almost no new literature in the survey since the 1990s. The DARPA and National Aeronautics and Space Administration programme of 1981 [Bellin and Brooks 1983], the 1988 stand test and mission analysis [McArdle 1988a] and a 1996 report whose title concerns the engine’s dynamic and transient performance [McArdle et al. 1996] are the field’s last substantial entries before a gap of more than twenty years. Of the 33 titles in the survey that name a convertible or turboshaft-turbofan engine, 31 date from 1967 to 1998, and the other two are from 2025 and 2026, on the performance and the mode-transition control of a turboshaft-turbofan engine [Jia et al. 2025b] [Li et al. 2026]. Both SPRINT finalists then answered the existing-engine rule with separate engines [Aurora on its SPRINT design, October 2024], so the current programme could not use the literature’s preferred solution.
Fourth, the hover side of runway independence rests on measurements that are decades old. The full-scale tiltrotor hover data are the Ames tests of the 1980s [Felker et al. 1985] [Felker et al. 1986a], and a 2017 report set out to widen that experimental base because computational work had concentrated on only two successful tiltrotors, the XV-15 and the MV-22B [Harris 2017a]. The title of one study places it most directly on people standing in a rotor’s outwash [Calvert and Wenren 2019]. The contemporary high-speed vertical take-off and landing design studies, including a 2024 preliminary design study and a student design competition winner, are cited for their titles [Yang et al. 2024a] [O’Brien and Delgado 2024].
And the literature is silent on the X-76’s keystone. No title in the survey reports a stop-fold conversion in flight. Bell’s sled test is the only powered prop-to-jet transition of a whole vehicle in the survey, the first known by its authors’ account, and it was on rails [Schank et al. 2025]. The X-76’s flight test would fill that gap, and it lies after the dateline.
Stopped, folded and stowed rotors
This is the X-76’s own lineage. It holds the rotor-stopping and stowed-rotor studies of the mid-1960s, the folding-proprotor studies of the late 1960s and 1970s, the full-scale folding rotor test of 1972, the stopped-rotor and rotor/wing concepts including the X-50’s canard rotor/wing, the X-wing’s stopped-rotor dynamics, and the stopped-rotor revival of the 2020s.
93 records. [Schank et al. 2025] [Engle and Sambell 1969] [Large Scale Wind Tunnel 1972] [Eisenberg and Bowles 1986] [Gleiter 1985] [White 1969] [Young 2024] [Brown and Ahuja 2023a] [Husseyin and Warmbrodt 2016a] [Husseyin and Warmbrodt 2016b] [Pandya and Aftosmis 2000] [Lawrence and Gold 1990] [Woods et al. 1989] [Schwartz and Rogers 1987] [Dopher and Duh 1987] [Mosher 1983] [Soule 1973] [Sharma et al. 2026] [Zhao et al. 2026b] [Zhang et al. 2026b] [Hilby et al. 2025a] [Hilby et al. 2025b] [Zhu et al. 2023] [Wang et al. 2023a] [Zhang et al. 2023a] [Gong et al. 2023] [Hu et al. 2023] [Brown and Ahuja 2023b] [Gao 2022] [He et al. 2022] [Nelson and Shen 2021] [Chao and Zhenghong 2019] [Deng and Mi 2019] [Gao et al. 2019a] [Gao et al. 2019b] [Dong et al. 2014] [Gai et al. 2014] [Slaby and Smith 2011] [Wendong Gai et al. 2011] [Tengfei Guo et al. 2011] [Demott et al. 2010] [Jeon 2008] [Kim and Lee 2007a] [Lee et al. 2006] [Kong et al. 2005] [Kim 2005] [Lopez and Wells 2004] [Kong et al. 2004] [The Boeing Canard Rotor/wing 2004] [Mitchell and Vogel 2003] [Pandya and Aftosmis 2001] [Helwani et al. 2001] [Pande 1999] [Tai et al. 1997] [Tai et al. 1996] [Tai et al. 1995] [Bass et al. 1995] [Crossley and Rutherford 1995] [Mavris et al. 1994] [Rutherford et al. 1993a] [Bass et al. 1993] [Bass and Rutherford 1993] [Swanson and Stroub 1992] [Olson 1992] [Craig et al. 1991] [Olson and Rumberger 1991] [Gilbert and Silva 1989] [Gilbert and Silva 1987] [Willshire and Martin 1984] [Matthys and Scroggs 1984] [Gimmestad 1981] [Magee and Taylor 1971] [Briardy et al. 1970] [Nicholson and Tiller 1970] [Rodden and Liu 1969] [Carlson and Maopolski 1969] [Detore and Gaffey 1969] [Cheeseman 1968] [Deckert and McCloud 1968] [Smith 1968] [Cheeseman 1967] [Amer et al. 1967] [Head 1966] [Harned and Head 1965] [Osder] [Leoni and Kaplita 1965] [Jepson and Carlson 1968] [Donham and Harvick 1967] [Donham and Prouty 1967] [Celniker et al. 1964] [Yillikci et al. 1993] [Niemiec et al. 2014a] [Niemiec et al. 2014b]
The tiltrotor and its relatives
The largest cluster, and the configuration the X-76 is in hover and conversion. It runs from the XV-3 and XV-15 research programmes through the V-22 and the civil tiltrotor studies to tilt-wing and electric tiltrotor work, and 274 of its records are on the National Aeronautics and Space Administration’s reports server.
1,198 records. [Simmons 2026] [Stutz et al. 2026b] [Thurman and Wang 2025b] [Horton et al. n.d.] [Jensen et al. 2025] [Perez et al. 2025] [Blaesser 2024] [Kreshock and Thornburgh 2024] [Acree 2024] [Perez et al. n.d.] [Blake et al. n.d.] [Pollard et al. 2023] [Ivanco et al. n.d.] [Zawodny et al. 2023a] [Kreshock et al. 2023a] [Young 2023] [Ingraham 2023] [Radotich n.d.] [Pei and Roithmayr 2022a] [Lopes et al. 2022] [Acree 2022] [Acree et al. 2022] [Whiteside et al. 2021] [Kratz and Culley n.d.] [Shelts and Schatzman 2020] [Geuther et al. 2020] [Kottapalli 2020] [Acree 2020] [Schatzman and Malpica 2019] [Kottapalli and Acree 2018] [Acree and Sheikman 2018] [Russell and Acree 2018] [Young 2018] [Persson and Lawrence 2017] [Harris 2017a] [Malpica 2017a] [Harris 2017b] [Grima 2016] [Acree 2016] [Solis and Meyn 2016] [Theodore et al. 2016] [Koning et al. 2016] [Koning 2016] [Koning 2015] [Acree 2014] [Snyder 2013] [Robuck et al. 2013] [Costa 2012] [Kaul 2012] [Robuck et al. 2012] [Suchezky and Cruzen 2012] [Malpica et al. 2011] [Malcipa et al. 2010] [Veres and Thurman 2010] [Snyder and Thurman 2010] [Acree 2010] [Snyder et al. 2010] [Germanowski et al. 2010] [Veres 2009] [Romander et al. 2007] [Romander 2006] [Kvaternil 2006] [Acree 2006a] [Acree and Johnson 2006] [Eames 2006] [Acree 2005a] [Betzina and Nguyen 2004] [D’Angelo 2004] [Acree 2004] [Masarati et al. 2004] [Acree et al. 2004] [Johnson 2003] [Harris 2003] [Acree 2003] [Yamauchi et al. 2003] [Betzina and Nguyen 2003] [Edwards and Conner 2003a] [Edwards and Conner 2003b] [Abrego et al. 2002] [Yamauchi et al. 2002] [Boyd and Burley 2001] [Johnson 2001a] [Acree and Rutkowski 2001] [Johnson et al. 2001] [Nixon et al. 2001b] [Brand et al. 2001] [McCluer et al. 2001] [Johnson 2001b] [Young et al. 2001] [Edwards et al. 2001] [Acree et al. 2001b] [Wadcock et al. 2001] [Kitaplioglu et al. 2000] [Acree 2000] [Kvaternik et al. 2000] [Acree et al. 2000] [Maisel et al. 2000] [Tadghighi and Rajagopalan 1999] [Wang et al. 1999] [Booth et al. 1999] [Ghiringhelli et al. 1999] [Burley et al. 1999] [Howard 1999] [Atencio and Banda 1998] [Young et al. 1998] [Edwards 1998] [Conner et al. 1998] [Lyle et al. 1997] [Kitaplioglu et al. 1997] [Dugan and Hindson 1997] [Nixon et al. 1997a] [Ghiringhelli et al. 1997] [Kozapalli and Warmbrodt 1997] [Lyle 1997] [McCarthy 1996] [Wells 1996] [Meakin 1996a] [Harris 1996] [Calise and Rysdyk 1996] [Brender et al. 1996] [George 1996] [Meakin 1996b] [Sternfeld et al. 1995] [Vadyak et al. 1995] [Wechsler and Rutherford 1995] [Studebaker and Abrego 1994] [Decker et al. 1994] [Birckelbaw et al. 1994] [Mosher and Light 1994] [Rais-Rohani 1994a] [Matuska et al. 1994] [Rais-Rohani 1994b] [Felker 1993] [Nixon 1993a] [Acree 1993] [Rogers and Reisdorfer 1993] [Schleicher et al. 1993] [Acree and Tischler 1993] [Conner and Wellman 1993] [Fejtek 1993] [Hindson et al. 1993] [Rais-Rohani 1993] [Totah 1992] [Hoad et al. 1992] [Coffen 1992] [Felker 1992] [Rutledge et al. 1991] [Vanaken 1991] [Conner and Wellman 1991] [Coffen et al. 1991] [Guerrero and Corliss 1991a] [Guerrero and Corliss 1991b] [Unger and Alexander 1991] [Totah and Madden 1991] [Bridgeman et al. 1991] [SantaMaria et al. 1991] [Jumper et al. 1991] [XV-15 1991] [Coffen and George 1990a] [Coffen and George 1990b] [Totah and Madden 1990] [Golub and Weir 1990] [Felker et al. 1990] [Decker et al. 1989] [Wolkovitch et al. 1989] [Schroers 1989] [Acree and Tischler 1989a] [Acree and Tischler 1989b] [George et al. 1989] [Wilkerson 1988] [Miller and Ham 1988] [Acree and Tischler 1988] [Faye et al. 1987] [Johnson et al. 1987] [Clay et al. 1987] [Tischler 1987] [Tischler and Kaletka 1987] [Felker et al. 1987] [Acree and Tischler 1987] [Bartie et al. 1986] [Tischler et al. 1986] [Tischler and Kaletka 1986] [Felker et al. 1986b] [Alexander et al. 1986] [Nasu 1986] [Bondi 1986] [Morlok and Schoendorfer 1985] [McCroskey et al. 1985] [Smith et al. 1985] [Tischler et al. 1985a] [Tischler et al. 1985b] [Dugan 1985] [Churchill and Gerdes 1984] [Tischler et al. 1984] [Ferguson et al. 1984] [McCroskey et al. 1983] [Magee 1983a] [Magee 1983b] [Schroers 1982] [Churchill and Dugan 1982] [Meuleners 1981] [Johnson 1980] [NASA/HAA Advanced Rotorcraft Technology 1980a] [NASA/HAA Advanced Rotorcraft Technology 1980b] [NASA/HAA Advanced Rotorcraft Technology 1980c] [Preliminary Design Study 1980] [Dugan et al. 1980] [Kimbell and Whitener 1980] [V/STOL Tilt Rotor Research 1980] [Liden 1980] [Weiberg and Maisel 1980] [Alexander et al. 1979] [Curtiss et al. 1979] [Wernicke and Magee 1979] [Magee and Alexander 1978] [Hofmann et al. 1978] [Shovlin and Gambucci 1978] [Brown et al. 1978] [Tilt Rotor Research Aircraft 1978] [V/STOL Tilt Rotor Research 1978a] [V/STOL Tilt Rotor Research 1978b] [Soohoo et al. 1977] [Kvaternik and Kohn 1977] [Amos and Alexander 1977] [Johnson 1977a] [Few and Edenborough 1977] [Wilson et al. 1976] [Hall and Buenz 1976] [Sambell 1976] [Radford et al. 1976] [Johnson 1976] [McVeigh 1976] [Marr 1976] [Johnson 1975a] [Detore and Sambell 1975] [NASA/Army XV-15 Tilt Rotor 1975] [Johnson 1975c] [Johnson 1975b] [Whitaker and Cheng 1975] [Marr et al. 1974] [Johnson 1974a] [Kvaternik 1974] [Gaffey and Maisel 1974] [Frick and Johnson 1974] [Faulkner 1974] [Johnson 1974c] [Poisson-Quinton and Cook 1973] [Gibs et al. 1973] [Kvaternik 1973a] [Kvaternik 1973b] [Rosenstein et al. 1973] [Soule and Badri-Nath 1973] [Magee and Alexander 1973] [Harendra et al. 1973] [Marr et al. 1973] [Poisson-Quinton and Cook 1972] [V/STOL Tilt Rotor Aircraft 1972a] [V/STOL Tilt Rotor Aircraft 1972b] [V/STOL Tilt-Rotor Study Task 1972] [Advancement of Proprotor Technology. 1971] [Chambers and Grafton 1970] [Advancement of Proprotor Technology. 1969] [Goodson 1966] [Biggers et al. 1966] [Chambers and Grafton 1966] [Kirby and Newsom 1964] [Kirby et al. 1963] [Quigley and Koenig 1961] [Grunwald 1961] [Koenig and Quigley 1960] [Hickey 1956] [Ye et al. 2026] [Wang et al. 2026f] [Zhao et al. 2026a] [Natelson and Rauleder 2026] [Wang et al. 2026b] [Simmons and Riso 2026] [Stutz et al. 2026a] [Zhang et al. 2026a] [Miao et al. 2026] [mao et al 2026] [Yang et al. 2026a] [Cheng et al. 2026] [Zinjarde et al. 2026] [Kim et al. 2026a] [Lade and Guérin 2026] [Liu et al. 2026a] [Ogle et al. 2026] [Simmons et al. 2026] [Semelka and Rauleder 2026] [Rovedatti et al. 2026] [Yu et al. 2026] [Comer et al. 2026a] [An and Kim 2026] [Villanueva-Aguado and Bronz 2026] [Immersion and Invariance Adaptive 2026] [May et al. 2026a] [Kim et al. 2026b] [Sun et al. 2026] [Kim 2026] [Sridhar and Smith 2026a] [Critchfield and Ning 2026] [O’Brien and Datta 2026a] [Lovera et al. 2026] [Hospodář and Kulhánek 2026] [Ibrahim et al. 2026] [Monnier and Litherland 2026] [Ouyang et al. 2026] [De Vita et al. 2026] [Chen 2026] [Bhandari and Chakraborty 2026b] [Cui 2026] [Delgado and Datta 2026] [Oh et al. 2026] [Sridhar and Smith 2026b] [Yu and Zhao 2026] [Zheng et al. 2026b] [Shin et al. 2026] [Peng et al. 2026] [Wright and Silva 2026] [Husain et al. 2026] [Choi et al. 2026] [Ahmed et al. 2026] [Sawron 2026] [Simmons and Ackerman 2026] [Wu et al. 2026b] [Adeyemi et al. 2026] [Burton et al. 2026] [May et al. 2026b] [Yue et al. 2026] [Delgado et al. 2026] [O’Brien and Datta 2026b] [Acree 2026a] [Acree 2026b] [Chakraborty et al. 2025] [Guan et al. 2025] [Yue et al. 2025] [Vinicius Rodrigues de Lima and Antônio dos Santos 2025] [Li and Yang 2025] [van ‘t Hoff et al 2025] [Feng et al. 2025] [Bowen et al. 2025] [Zheng et al. 2025] [Kim et al. 2025a] [Thornburgh et al. 2025] [Yu et al. 2025a] [Hong et al. 2025a] [Kim and Jo 2025] [Xia et al. 2025] [Puchuela and Sankar 2025] [Cook 2025] [Lira Sassett et al. 2025] [Wang et al. 2025a] [Doff-Sotta et al. 2025] [Choi et al. 2025] [Ma et al. 2025] [Aerospace et al. 2025a] [Wang et al. 2025b] [Design and Simulation 2025] [Gong et al. 2025] [Wang et al. 2025c] [Rosas Cordova et al. 2025] [Park and Roh 2025] [Zulkafli et al. 2025] [Chen and Guo 2025] [Gainutdinov and Gainutdinova 2025] [Wang et al. 2025d] [Kong et al. 2025] [Zhu et al. 2025b] [Kang et al. 2025a] [Simmons et al. 2025a] [Zhu et al. 2025c] [Huang and German 2025] [Tang et al. 2025] [Hou et al. 2025] [Cheng et al. 2025b] [Delgado and Datta 2025] [Stanzione 2025] [Zhao et al. 2025a] [Ruan et al. 2025] [Son et al. 2025a] [Lim and Jung 2025] [Sagan et al. 2025] [Li et al. 2025b] [Xing et al. 2025] [Aerospace et al. 2025b] [Savino 2025] [Thurman and Wang 2025a] [Yuan and Xian 2025] [Nunes et al. 2025] [De Vita et al. 2025] [Goodarzi et al. 2025] [Sridhar et al. 2025] [Zhang et al. 2025b] [Zhu and Wang 2025a] [Zhu and Wang 2025b] [Gao et al. 2025b] [Chen et al. 2025a] [Guo et al. 2025a] [Guan and Xian 2025] [Helicopters et al. 2025a] [Kang et al. 2025b] [Nabiyev et al. 2025] [Simmons et al. 2025b] [Park and Younus 2025] [Akinwale and Datta 2025a] [Hong et al. 2025b] [Yamazaki et al. 2025] [DiMaggio et al. 2025] [Liang et al. 2025] [May et al. 2025] [Guo et al. 2025b] [Akinwale and Datta 2025b] [Ivanco et al. 2025] [Son et al. 2025b] [Gul and Yeo 2025] [Punzi et al. 2024] [Shinozuka et al. 2024] [Liu et al. 2024a] [Hu et al. 2024a] [Jia et al. 2024] [Henríquez and Kilikevičius 2024] [Li et al. 2024] [der Meulen et al. 2024] [Hu et al. 2024b] [Shen and Baggett 2024] [Hwang et al. 2024] [Radotich 2024] [Oyama et al. 2024] [Gul and Yeo 2024] [Lim et al. 2024] [Rojo-Rodriguez et al. 2024] [Jeong et al. 2024] [He 2024] [Rohit 2024] [Tsai et al. 2024] [Meza et al. 2024] [Anantha et al. 2024] [Salahudden et al. 2024] [Wang et al. 2024a] [Comer and Chakraborty 2024] [Hu et al. 2024c] [Nie et al. 2024b] [Delgado and Datta 2024] [Carlson and Papachristos 2024] [Liao et al. 2024] [Moushegian et al. 2024] [Zhao et al. 2024a] [O’Brien and Datta 2024] [Zhang et al. 2024a] [Kang et al. 2024] [Qu et al. 2024] [Biggi et al. 2024] [Song et al. 2024b] [Santos Martins Nunes and Su 2024] [Huang et al. 2024] [Du and Zha 2024] [Nabiyev 2024] [Beretta et al. 2024] [Shahjahan et al. 2024] [Gali and Riso 2024] [Roiati et al. 2024] [Burton et al. 2024] [Berger et al. 2024] [Horn et al. 2024] [Gul and Datta 2024] [Zhang et al. 2024d] [Wang et al. 2024c] [Kaballo and Arogeti 2024] [Thornburgh and Kreshock 2024] [Li 2024] [Belardo et al. 2024] [Liu and Zhang 2024] [Yang et al. 2024d] [Saetti and Buğday 2023] [Cocco and Savino 2024] [Ingraham and Kinney 2024] [May et al. 2024a] [Yang et al. 2024e] [May et al. 2024b] [Marano et al. 2024] [Sutherland et al. 2024] [van ‘t Hoff et al 2024] [Daud Filho and Belo 2023] [Gul and Datta 2022a] [Zawodny et al. 2023b] [Porcacchia et al. 2023] [Lovell-Prescod et al. 2023] [Juhasz et al. 2023] [Bucciaglia et al. 2023a] [Kang et al. 2023a] [Murugan and Lm 2023] [Gebril and Kamal 2023] [Jin et al. 2023] [van ‘t Hoff et al 2023] [Zhao et al. 2023a] [Albuck et al. 2023] [Rostami et al. 2023] [Adebimpe 2023] [Cassinelli et al. 2023] [Pei et al. 2023] [Akinwale and Datta 2023] [Gul and Yeo 2023] [Wen et al. 2023a] [Primatesta et al. 2023] [Bath et al. 2023] [Kreshock et al. 2023b] [Bucciaglia et al. 2023b] [Chen et al. 2023] [Bachelder et al. 2023] [Zhao et al. 2023c] [Pricker and Armanini 2023] [Belák and Hromčík 2023a] [Panish et al. 2023] [Lin et al. 2023] [Huang et al. 2023] [Henkenjohann et al. 2023] [Bao et al. 2023] [Muscarello and Quaranta 2023] [Taubert et al. 2023] [Yan et al. 2023] [Zhang et al. 2023b] [An and Shao 2023] [Kang et al. 2023b] [Chakraborty and Mishra 2023] [Marano et al. 2023] [Cho et al. 2023] [Appleton 2023] [Cassoni 2023] [Comer and Chakraborty 2023] [Tran et al. 2023] [Wen et al. 2023b] [Burton et al. 2023] [Tran and Yeo 2022b] [Hyun et al. 2023] [Liao and Bang 2023] [Krimphove et al. 2023] [Khurana et al. 2023] [Yeo et al. 2023] [Belák and Hromčík 2023b] [Lichota 2023] [Wang et al. 2022a] [Osa et al. 2022] [Soemarwoto et al. 2022] [Simmons and Murphy 2022] [Huang et al. 2022] [Zhou et al. 2022] [Yuan et al. 2022a] [Marano et al. 2022] [Galles et al. 2022] [Lu et al. 2022] [Savino et al. 2022] [Yang et al. 2022a] [Pei and Roithmayr 2022b] [Yuan et al. 2022b] [Wu et al. 2022] [Juhasz et al. 2021] [DeNicola et al. 2022] [Qing et al. 2022] [Shen and Tsuchiya 2022] [Ivanco et al. 2022] [Tran and Lim 2022] [Chen and Chen 2022] [Sheng et al. 2022] [Zhang et al. 2022a] [Rogers et al. 2022] [Fan et al. 2022] [Cocco et al. 2022] [Kreshock et al. 2022] [Xu et al. 2022] [Bath et al. 2022] [Ma et al. 2022] [Nabiyev and Abdullayev 2022] [Набиев et al. 2022] [Chakraborty et al. 2022] [Milz and Looye 2022] [Berger et al. 2022b] [Tran and Yeo 2022a] [Panish and Bacic 2022] [Lombaerts et al. 2022] [Wang et al. 2022b] [Dong and Li 2022] [Tsai et al. 2022] [Gul and Datta 2022b] [Sutherland et al. 2022] [Su et al. 2021] [Osa et al. 2021] [Набиев and Aбдуллаев 2021] [Haidar et al. 2021] [Chen and Chen 2021] [Wu and Chen 2021] [Leng et al. 2021] [Hegde et al. 2021] [Huan et al. 2021] [Baggett et al. 2021] [Chen et al. 2021] [Cocco et al. 2021] [Annamalai and Thunaipragasam 2021] [Sutherland and Datta 2021] [Yang and Morales 2021] [Gul and Datta 2021] [Appleton et al. 2021] [Bachmaier and Anderson 2021a] [Ma et al. 2021] [Yeo et al. 2021] [Alvaro D. H. Arroyo et al. 2021] [Zhao et al. 2021] [Yokota et al. 2021] [Taubert et al. 2021] [Corle et al. 2021] [Içke et al. 2021] [Набиев et al. 2021] [Bachelder et al. 2021] [Zou et al. 2021] [Carlson and Papachristos 2021] [Lu et al. 2021] [Bath et al. 2021] [Yeo and Saberi 2021] [Thirumaleshwar Hegde et al. 2021] [Wang et al. 2021b] [Yuan et al. 2021] [Bachmaier and Anderson 2021b] [Busan et al. 2021] [Simmons and Murphy 2021] [Belardo et al. 2021] [Barra et al. 2020] [Yatsun et al. 2020] [Xu et al. 2020] [Yuan et al. 2020a] [Zeng et al. 2020] [Wilson and Prazenica 2020] [Chen et al. 2020] [Nabiyev et al. 2020] [Jatsun et al. 2020a] [Zheng et al. 2020a] [Hegde 2020] [Jatsun et al. 2020b] [Yuan et al. 2020b] [Bauersfeld and Ducard 2020] [Shimizu and Miwa 2020] [Tran et al. 2020] [Wang et al. 2020b] [Quackenbush et al. 2020b] [Asalani et al. 2020] [Belardo et al. 2020] [AvMC et al. 2020a] [Arl et al. 2020] [Chauhan and Martins 2020] [AvMC et al. 2020b] [Sanchez-Rivera et al. 2020] [Thirumaleshwar Hegde et al. 2020] [Yeo and Kreshock 2020] [Cummings et al. 2020] [Nabi et al. 2019] [Muscarello et al. 2019] [Kottapalli et al. 2019] [Li et al. 2019] [Zhang et al. 2019a] [Kottapalli and Cecil 2019] [Wakefield et al. 2019] [Warren et al. 2019] [Tsai and Datta 2019] [Chen et al. 2019a] [Autenrieb et al. 2019] [Kreshock et al. 2019b] [Rigo et al. 2019] [Lu et al. 2019] [Aoki and Muraoka 2019] [Lim 2019] [Staruk and Datta 2019] [W. et al. 2019] [Muscarello 2019] [Chiappinelli et al. 2019] [Chapman 2019] [Chen 2019b] [Wu et al. 2019a] [Tan et al. 2019] [Muscarello and Quaranta 2019] [Sanchez-Rivera et al. 2019] [Kandath et al. 2019] [Kang et al. 2019] [Corle et al. 2019b] [Shimizu and Miwa 2019] [Yeo and Kreshock 2019] [Zhang et al. 2019c] [Osa et al. 2018] [Pagano 2018] [Li and Xia 2018a] [Li and Xia 2018b] [Ho and Yeo 2018] [Apkarian 2018] [Corle et al. 2018] [Yeo et al. 2018] [Bowen-Davies 2018] [Sheng et al. 2018] [Zhang et al. 2018a] [Xiao et al. 2018a] [Bushgens et al. 2018] [Paiva et al. 2018] [Umer et al. 2018] [Xiao et al. 2018b] [Helicopter and Tiltrotor Flight 2018] [Hong and Ansell 2018] [Introduction to the Flight 2018] [Avital et al. 2018] [Pan et al. 2018] [Wang et al. 2018b] [Gires 2018] [Robert 2018] [Tiltrotor Aircraft 2018] [Zhang et al. 2018b] [Shimizu and Miwa 2018] [Yeo and Liu 2018] [Cao and Qi 2018] [V-22 and AW609 Tiltrotors 2018] [Hegedűs 2017] [Mascarello et al. 2017] [Yin et al. 2017] [Bevan et al. 2017] [Kambampati and Smith 2017] [Li and Xia 2017] [Shen and Kang 2017] [Yeo et al. 2017] [Description of XV-15 Design 2017] [Lu et al. 2017] [Brewer et al. 2017] [Cao et al. 2017b] [Staruk and Datta 2017] [Dreier 2017] [Righetti et al. 2017] [Staruk et al. 2017] [Sasongko and Muhammad 2017] [Bautista et al. 2017] [Liang et al. 2017] [Lichota and Szulczyk 2017] [Malpica 2017b] [Osa et al. 2017] [Hoover et al. 2017a] [Zhang et al. 2017] [Dehaeze et al. 2017] [Emelyanova et al. 2017] [Jimenez-Garcia et al. 2017] [Floros and Kang 2017] [Kreshock and Yeo 2017] [Hartmann et al. 2017] [Kang et al. 2017] [Kim et al. 2016] [Jimenez-Garcia and Barakos 2016] [Kim and Choi 2016] [Hadytama and Sasongko 2016] [Cai et al. 2016] [Lee and Lee 2016] [Lu et al. 2016a] [Di Francesco and Mattei 2016] [Lu et al. 2016b] [Zhen Pan et al. 2016] [Kang et al. 2016] [Droandi et al. 2016] [Alam et al. 2016] [Osa et al. 2016] [Ji et al. 2016] [Zhao and Wang 2016] [Udartsev et al. 2015] [Droandi and Gibertini 2015a] [Droandi and Gibertini 2015b] [Staruk et al. 2015] [Cetinsoy 2015] [Mikami and Uchiyama 2015] [Costa et al. 2015] [Murphy and Landman 2015] [Wang and Cai 2015] [Krüger 2015] [Song et al. 2015] [Lindqvist et al. 2015] [Kahvecioglu and Alemdaroglu 2015] [Hu-Sheng Wu et al. 2015] [Young 2015] [Bevan et al. 2015] [Hernandez-Garcia and Rodriguez-Cortes 2015] [Robinson 2015] [Flores et al. 2014] [Zhang et al. 2014a] [Ke et al. 2014] [Snyder 2014] [Wang and Wen-hai 2014] [Rothhaar et al. 2014] [Zhang et al. 2014b] [Sunkara et al. 2014] [Oktay 2014] [Zhao et al. 2014] [Cao et al. 2014] [Osa et al. 2014] [Tan et al. 2014] [Huangzhong et al. 2014] [Li and Xia 2014] [Newman et al. 2014] [Ying and Liang 2013] [Cole et al. 2013] [Russell and Johnson 2013a] [Ibrahim and Bil 2013] [Peng et al. 2013] [Ferrarese et al. 2013] [Simioni et al. 2013] [Lee and Lee 2013] [Young and Rajagopalan 2013] [Kim et al. 2013] [Snyder et al. 2013] [Judas and Deligiannidis 2013] [Chen et al. 2013] [Sunkara et al. 2013] [Papachristos et al. 2013] [Miyamoto et al. 2012] [Scott and Schrage 2012] [Duffy et al. 2012] [Fang et al. 2012] [Syzdykov et al. 2012] [Gibson et al. 2012] [Juhasz et al. 2012] [Malpica et al. 2012] [Stagliano and Hornung 2012] [Kim et al. 2012] [Mattaboni et al. 2012] [Snyder and Acree 2012] [Howard 2012] [Kaul and Ahmad 2012] [Colella et al. 2012] [Papachristos et al. 2012] [Krishnamurthy and Khorrami 2011] [Yang and Xia 2011] [Young et al. 2011] [Lawrence et al. 2011] [Kim and Choi 2011] [Kim et al. 2011] [McVeigh et al. 2011] [Papachristos et al. 2011] [Mattaboni et al. 2011] [Park et al. 2011] [Abras and Narducci 2010] [Welch 2010] [Paik and Gandhi 2010] [Zhu et al. 2010] [Park et al. 2010] [Choi et al. 2010] [Choi and Kim 2010] [Notarstefano and Hauser 2010] [Haixu et al. 2010] [Gennaretti et al. 2010] [Strand 2010] [Yue and Xia 2009] [Leishman 2009] [Kim et al. 2009] [Narducci et al. 2009] [Cooper et al. 2009] [Yanguo and Huanjin 2009] [Yomchinda et al. 2009] [Yeo and Johnson 2009b] [Muraoka et al. 2009] [Sun et al. 2009] [Lee-Rausch and Biedron 2009] [Vorwald 2009] [Johnson and Maddali 2008] [Hassan 2008] [Kim and Shin 2008] [Padfield 2008] [Youngshin Kang et al. 2008] [Acree 2008] [Isaac 2008] [Voskuijl and Walker 2007] [Paik et al. 2007] [Lancaster et al. 2007] [Hathaway and Gandhi 2007] [Gandhi and Paik 2007] [Charnov 2007] [Dreier 2007] [Introduction to the Flight 2007] [Walker and Perfect 2007] [Kim and Lee 2007b] [Cullen and Schaeffer 2007] [Johnson and Yeo 2007] [Mitchell 2007] [Kim et al. 2007] [Baldwin 2007] [Song 2007] [Charnov 2006] [Mueller et al. 2006] [Ananthan and Leishman 2006] [Yonghua and Jun 2006] [Bailey et al. 2006] [Barla et al. 2006] [Yu et al. 2006] [Acree 2006b] [Silva et al. 2006] [Manimala et al. 2006] [Song et al. 2006] [Radhakrishnan and Schmitz 2006] [Mayer and Wozniak 2006] [Hassan 2004b] [Schank 2006] [Hathaway and Gandhi 2006] [Kim et al. 2006] [Orr and Hajela 2005] [Singh et al. 2005] [Choi 2005] [Kunz 2005] [Potsdam and Strawn 2002b] [Acree 2005b] [Singh and Chopra 2005] [Ferguson and Dreier 2005] [Crane et al. 2005] [Min et al. 2005] [Gervais and Schmitz 2005] [Bi et al. 2005] [Preator et al. 2005] [Radhakrishnan and Schmitz 2005] [Han 2005] [Leishman et al. 2004] [McVeigh et al. 2004] [Model Predictive Control 2004] [Carlson and Zhao 2004] [Hassan 2004a] [Gervais and Schmitz 2004] [Hathaway and Gandhi 2004] [Mix et al. 2004] [Stalker et al. 2004] [Singh and Chopra 2003a] [Brown et al. 2003] [Radhakrishnan and Schmitz 2003] [Masarati et al. 2003] [Alli 2003] [Foster 2003] [Fosnaugh and Carl J. 2003] [Hathaway and Gandhi 2003] [Carlson and Zhao 2003] [Nixon et al. 2003] [Darabi and Wygnanski 2003] [Gervais and Schmitz 2003] [deBrun et al 2003] [Lee and Baeder 2003] [Singh and Chopra 2003b] [Johnson et al. 2003] [Piatak et al. 2002] [Yassini and Syrovy 2002] [Kvaternik et al. 2002] [Sitaraman and Baeder 2002] [Duello 2002] [Potsdam and Strawn 2002a] [Frost et al. 2002] [Meyer and Padfield 2002] [Bi and Haas 2002] [Gupta and Baeder 2002] [Hathaway and Gandhi 2002] [Conner et al. 2002] [Carlson and Zhao 2002] [Baeder and Gupta 2002] [Gervais and Schmitz 2002] [Singh and Chopra 2002] [Bennett et al. 2001c] [Nixon et al. 2001a] [Bennett et al. 2001a] [Altman et al. 2001] [Mehra et al. 2001] [Acree et al. 2001a] [Gervais 2001] [Nixon et al. 2000] [Settle and Wise 2000] [Betzina et al. 2000] [Fenny and Hart 2000] [Corso et al. 1997b] [Prichard 2000] [Morino et al. 2000] [Conner et al. 2000] [Soykasap and Hodges 2000] [Song et al. 2000] [Corso et al. 1999] [Liu et al. 1999] [Bauer et al. 1999] [Carlson et al. 1999] [Botha et al. 1999] [Liu and Tadghighi 1999] [Rand and Peyran 1999] [Ford 1999] [Edwards et al. 1999] [Calise and Rysdyk 1998] [Srinivas et al. 1998] [Liardon et al. 1998] [Polak and George 1998] [Srinivas and Chopra 1998a] [Faass 1998] [Brieger et al. 1998] [Kottapalli 1998] [Chen et al. 1998] [Barkai and Rand 1998] [Poling et al. 1998] [Srinivas and Chopra 1998b] [Calise et al. 1997] [Corso et al. 1997a] [Nixon and Settle 1997] [Chattopadhyay et al. 1997] [Rysdyk et al. 1997] [Popelka et al. 1997] [Nixon et al. 1997b] [McVeigh et al. 1997] [Brieger et al. 1997] [Brunson and Rais-Rohani 1996] [Smith 1996b] [Spencer et al. 1996] [Srinivas and Chopra 1996] [Bagai and Leishman 1995b] [Marcolini et al. 1996] [Tai 1996a] [Tai 1996b] [Poling et al. 1996] [Chopra and Srinivas 1996] [Gerald-Yamasaki 1996] [Wood et al. 1995] [Srinivas et al. 1995] [Quackenbush et al. 1995] [Builta et al. 1995] [Bagai and Leishman 1995a] [Brieger et al. 1995] [Berry et al. 1995] [Wood and Peryea 1995] [Egolf et al. 1995] [Tai 1995] [Bray 1995] [Carico and Garcia-Otero 1995] [Meakin 1995] [Farrell et al. 1994] [Liu et al. 1994] [Smith et al. 1994] [Dadone et al. 1994] [Doman and Andrisani 1994] [Rais-Rohani and Baker 1994] [Schleicher 1993] [Reber 1993] [Kimball 1993] [Meakin 1993] [Okuno and Kawachi 1993] [Nixon 1993b] [Peryea and Wood 1993] [Sullivan 1993] [Chana and Sullivan 1993] [Coffen and George 1993] [Khader and Abu-Mallouh 1992] [Wellman 1992] [Rutherford and Bass 1992] [Stettner and Schrage 1992] [Kottapalli and Meza 1992] [Sedivy 1992] [Riley 1992] [Curtiss and Warburton 1992] [Fejtek and Roberts 1992a] [Fejtek and Roberts 1992b] [Van Decker 1992] [Nixon 1992] [VanderVliet 1992] [Chana and Sullivan 1992] [Magnuson et al. 1992] [Uppaluri and Douglass 1991] [van Aken 1991] [Liu and McVeigh 1991] [Rangacharyulu and Moore 1991] [Joglekar et al. 1991] [Vorwald and Chopra 1991] [Miller et al. 1991] [Chambers 1991] [Application of Computational Fluid 1990] [Branum and Tung 1990] [McVeigh et al. 1990] [Golub et al. 1990] [Hirsh et al. 1990] [Thomason 1990] [Author 1989] [Huston et al. 1989] [Ward 1989] [Narramore and Vermeland 1989] [V-22 Osprey Tilt-Rotor Flies 1989] [Martin and Ostlund 1989] [Taylor and Wilkerson 1988] [Bennett et al. 1988] [Grauer et al. 1988] [Ford CEng MRAes 1988] [Honaker 1987] [Brieger et al. 1987] [Arnold et al. 1987] [Dooley et al. 1987] [Rosenstein and Clark 1986] [Batra et al. 1986a] [Gass et al. 1986] [Batra et al. 1986b] [Dabundo and Neary 1985] [Clark 1985] [McVeigh et al. 1983] [Thomason 1983a] [Tischler et al. 1983] [Thomason 1983b] [Bilger et al. 1982a] [Bilger et al. 1982b] [Thomason 1982] [Narramore 1981] [Maisel and Harris 1981] [Bilger et al. 1981a] [Wernicke 1981] [Bilger et al. 1981b] [Wernicke 1980] [Pruynn and Shannon 1980] [Wernicke et al. 1980] [Erhart et al. 1980] [Lee and Mosher 1979] [Beser 1979] [Schroers et al. 1979] [Magee and Wernicke 1979] [Beser 1978] [Morris and Alexander 1978] [Thomason 1978] [Johnson 1977b] [Wernicke 1977] [Brown and Edenborough 1977] [Brown et al. 1977] [Kvaternik 1976] [Gibs et al. 1976] [Marr et al. 1976] [Gibs et al. 1975] [Marr and Roderick 1974b] [Gold and Walchli 1974] [Alexander et al. 1974] [Marr and Roderick 1974a] [Edenborough et al. 1972] [Marr and Neal 1972] [Fraga and Liiva 1972] [Wernicke and Edenborough 1972] [Baird et al. 1972] [Sambell 1972] [Michaelsen 1971] [Sambell 1971] [Edenborough and Wernicke 1971] [Champine 1971] [Tiller and Nicholson 1971] [Pruyn and Taylor 1970] [DeTore and Gaffey 1970] [Wernicke 1969] [Edenborough 1968] [Borst 1968] [Brown and Fischer 1967] [Edenborough 1967] [Longhurst 1966] [Beppu and Curtiss 1966] [Fry 1965] [Breul 1963] [Nichols 1963] [Martin 1963b] [Martin 1963a] [Liu 1962] [Hargraves 1961] [Putman 1961] [Convertiplane Described 1959] [“Convertiplane” 1959] [Dancik et al. 1958] [Davis and Mertens 1958] [Woods 1957] [Marks 1957] [Mazzitelli 1957] [Stepniewski 1957] [McCormick and Mallen 1956] [Marks 1956] [Hohenemser 1955] [Cobey 1953] [Doetsch and Mark 1953] [Barnes] [Daud Filho] [Rysdyk and Calise] [Mohd Zawawi] [Botelho] [Lockhart] [O’Hara] [Dousis] [Zhong Chen et al] [Arroyo] [Carico] [Schmalzel et al] [Carico] [Dousis] [Mehra et al] [Chattopadhyay et al. 1995] [McCarthy and Chattopadhyay 1996] [Melo] [Colli et al. 2026] [Jordon et al. 1985] [Raghavan et al. 1990] [Saetti 2025a] [Droandi et al. 2015] [Rais-Rohani 1999] [Whitt and Gandhi 2023] [Chen 2025] [Light and Swanson 1992] [Smith et al. 2023] [Huang et al. 2020] [Russo 2026]
Proprotor whirl flutter and tiltrotor aeroelasticity
The first of the two limits the stop-fold configuration escapes. The cluster runs from the propeller-nacelle whirl flutter work of the early 1960s through the tiltrotor aeroelastic analyses of the 1970s to the current whirl flutter test rigs.
130 records. [Johnson 1974b] [Acree et al. 1999] [Nelson et al. n.d.] [Waite et al. n.d.] [Heeg et al. 2019] [Miller and Truax 2018] [Acree and Hoffman 2004] [Reed 1967] [Reed 1965] [Bennett and Bland 1964] [Bennett and Reed 1963] [Bland and Bennett 1963] [Chang and Cesnik 2026] [Haramura Bastos and de Vasconcellos 2026] [Kreshock et al. 2026] [Kher et al. 2026] [Magliocco et al. 2026] [dos Santos et al 2026] [Reveles et al. 2026] [Song et al. 2026] [Magliocco 2026] [McKechnie and Barakos 2025] [Chang and Cesnik 2025] [Böhnisch et al. 2025] [D’Alessandro et al. 2025] [Song et al. 2025] [Riso 2025] [Čečrdle et al. 2025] [Kreshock et al. 2025b] [Kreshock et al. 2025a] [de Gaudemaris et al. 2025] [Santos et al. 2025] [Tavares Pereira dos Santos et al. 2025] [Wang et al. 2025j] [Koch 2025] [da Luz et al. 2025] [Helicopters et al. 2025b] [Kantzidis et al. 2024] [Böhnisch et al. 2024] [Reveles et al. 2024] [Reveles and Rajagopal 2024] [Koch et al. 2024] [Muscarello and Quaranta 2024] [Haramura Bastos and de Vasconcellos 2024a] [Riso 2024a] [Koch and Koert 2024] [Gali et al. 2024] [Čečrdle et al. 2024] [Riso 2024b] [Haramura Bastos and de Vasconcellos 2024b] [Gatlin and Riso 2024] [Warren and Riso 2024] [Gaudemaris et al. 2024] [Chang et al. 2024] [Yildiz et al. 2023] [čečrdle 2023] [čečrdle 2023] [Gali et al. 2023a] [Koch and Koert 2023] [čečrdle 2023] [Nelson and Shen 2023] [Gali et al. 2023b] [Quintana et al. 2023] [čečrdle 2023] [Whirl Flutter of Turboprop 2023] [čečrdle 2023] [Bastos and de Vasconcellos 2023] [Haramura Bastos and de Vasconcellos 2023] [Suenai Haramura Bastos and Grombone de Vasconcellos 2022] [Aplicação De Transdutores Piezoelétricos 2022] [Quintana et al. 2022] [Gagliardi et al. 2022] [Nelson and Shen 2022] [Böhnisch et al. 2022] [Quintana et al. 2021] [Koch 2021] [Mair et al. 2021] [Muscarello and Quaranta 2021] [Quintana et al. 2020] [Higgins et al. 2019] [Kreshock et al. 2019a] [Guruswamy 2019] [Hoover and Shen 2019a] [Mair et al. 2019] [Corle et al. 2019a] [Reveles et al. 2019] [Hoover and Shen 2019b] [Čečrdle 2018] [Mair et al. 2018] [Hoover and Shen 2018a] [Hoover and Shen 2018b] [Hoover et al. 2018] [Hoover and Shen 2018c] [Hoover et al. 2017b] [Whirl Flutter Optimisation-Based Solution 2017] [Cecrdle et al. 2017] [Cecrdle 2016] [Cecrdle et al. 2016] [Rath et al. 2016] [Yang et al. 2015] [Zhang and Smith 2015] [Čečrdle 2015a] [Čečrdle 2015b] [Čečrdle 2015c] [Richter et al. 2015] [Cecrdle et al. 2015] [Čečrdle 2015d] [Wang and Chen 2015] [Whirl Flutter of Turboprop 2015] [Čečrdle 2015e] [Cecrdle and Malecek 2014a] [Cecrdle and Malecek 2014b] [Cecrdle 2012] [Gennaretti and Greco 2008] [Kunz 2002] [Rand and Peyran 2000] [Nitzsche 1994] [Nitzsche and Rodrigues 1992] [Nitzsche 1991] [Nitzsche and Rodrigues 1990] [Nitzsche 1989a] [Nitzsche 1989b] [Nitzsche 1988] [Kaza 1973] [Johns 1972] [Reed 1966] [Araki 1963] [Houbolt and Reed 1962] [De Gaudemaris] [Etemadi]
High-speed propellers and tip compressibility
The second limit. It holds the high-speed propeller and propfan literature, the advanced turboprop programme, and the work on tip Mach number effects and noise, which is where the helical tip Mach number of the sizing section is a working quantity.
191 records. [Dittmar and Hall 1991] [Sim and George 1993b] [Envia 1992] [Boldman et al. 1991] [Graber 1990] [Jou 1989] [Kaza 1988] [Carlson and Pendergraft 1987] [Dittmar and Stang 1987b] [Graber 1987] [Dittmar 1985a] [Dittmar 1985c] [Stefko and Jeracki 1985b] [Johnson 1983a] [Rohrbach et al. 1982] [Mackall et al. 1982] [Dittmar and Rice 1981] [Mehmed et al. 1981] [Jeracki and Mitchell 1981] [Dittmar et al. 1978] [Kurbjun 1959] [Hubbard and Lassiter 1954] [Fabri and Siestrunck 1953] [Stack et al. 1950] [Platt and Gilman 1949] [Diehl et al. 2026] [Jerominek 2026] [Popa et al. 2025] [Ristea et al. 2025] [Su et al. 2025] [Glegg and Devenport 2024] [Zhao et al. 2024d] [Pham et al. 2023] [Lefevre et al. 2022b] [Lefevre et al. 2022a] [Boisard 2021] [Boulkeraa et al. 2022] [Soundararajan and Jothi 2021] [Niskorodnov and Shvetc 2020] [Patrao et al. 2019] [Capitao Patrao et al. 2018] [DeLorenzo et al. 2018] [Hambrey et al. 2017a] [Moffitt et al. 2017] [Hambrey et al. 2017b] [Barnes 2017] [Park 2016] [Slaboch et al. 2016] [Guo and Thomas 2016] [Morizawa et al. 2016] [El-Sayed 2016] [Guo et al. 2015] [Guo and Thomas 2015a] [Guo and Thomas 2015b] [Ghenaiet and Halimi 2014] [Müller et al. 2014] [Marinus 2014] [Thomas et al. 2014] [Fuentes et al. 2013] [Deng et al. 2012] [Marinus 2012] [Kong et al. 2012] [Peters and Spakovszky 2010] [Marinus et al. 2009] [Black et al. 2006] [Bousquet and Gardarein 2003] [Polacsek et al. 2000] [Boyle et al. 1999] [Wallscheid et al. 1998] [Leth et al. 1998] [Ohman and Nguyen 1995] [Maass 1995] [Helming 1994a] [Helming 1994b] [Maass et al. 1994] [Sim and George 1993a] [Petrov 1993] [Mehmed and Kurkov 1993] [Shattuck and Young 1993] [Kuznetsov 1993] [Dunn and Farassat 1992] [Kodama and Namba 1992] [Yamamoto 1992] [Melake 1992] [Nallasamy 1992b] [Nallasamy 1992a] [Gazzaniga and Rose 1992] [Coe and Perkins 1991] [Takallu and Lessard 1991] [Naik 1990] [Hall and Delaney 1990] [Kim 1990] [Miller and Podboy 1990] [Coe and Perkins 1990] [Farassat et al. 1990] [Kirker 1990] [Dunn and Farassat 1990] [McCurdy 1989] [Lindblad 1989] [Anderson and Wagner 1989] [Swift and Bartel 1989] [Nallasamy et al. 1989] [Reddy et al. 1989] [Chambers et al. 1989] [Arakawa et al. 1989] [Bartel and Swift 1989] [Chen 1989] [Battezzato and Pias 1989] [Chapman et al. 1989] [McCurdy 1988] [Gee and Novick 1988] [Zickwolf and Cole 1988] [Miller 1988] [Mehmed and Murthy 1988] [Nallasamy et al. 1988a] [Nallasamy et al. 1988b] [Whitlow and Sievers 1988] [Matsuo et al. 1988] [Yoon and Schetz 1988] [Chapman et al. 1988] [Farassat et al. 1987] [Heidelberg and Woodward 1987] [Kaza et al. 1987] [Berman 1987] [Dittmar and Stang 1987a] [Anderson et al. 1987] [Peacock 1987] [Nallasamy et al. 1987a] [Nallasamy et al. 1987b] [Woodward 1987] [Saito et al. 1987] [Snyder 1987] [Chapman et al. 1987] [Reynolds et al. 1987] [Weslet and Sutherland 1987] [Aljabri 1987] [Lange 1986] [McCurdy et al. 1986] [Awker 1986] [Lyman and Hancock 1986] [Yamamoto et al. 1986] [Yoon and Schetz 1986] [Propfan Propulsion System Tested 1986] [Bradlaugh-Dredge 1986] [Grieb and Eckardt 1986] [Kordan et al. 1985] [Anderson et al. 1985] [McCurdy 1985] [Carlson et al. 1985] [Novick et al. 1985] [Dittmar 1985b] [Barton et al. 1985] [Sagerser and Ludemann 1985] [Padula and Block 1985] [Schmidt 1985] [Stefko and Jeracki 1985a] [Anderson et al. 1984] [Magliozzi 1984] [Hinson 1984] [McAninch and Rawls 1984] [Brooks and Mackall 1984] [Padula and Block 1984] [McCurdy 1984] [Chi 1984] [Coe et al. 1984] [Narain 1983] [Anderson et al. 1983] [Bennett et al. 1983] [Muehlbauer and Morris 1983] [Aljabri 1983] [McCurdy 1983] [Gilchrist 1983] [Chandrasekaran and Bartlett 1983] [Johnson 1983b] [Bober et al. 1983] [Godston and Reynolds 1983] [Bauer 1983] [Hirschkron and Davis 1982] [Mitchell and Mikkelson 1982] [Muehlbauer and Morris 1981] [Serafini et al. 1981] [Smith and Levin 1981] [Goldsmith and Bowles 1980] [Bober and Mitchell 1980] [Stolp 1979] [Dugan et al. 1977] [Nelson 1964] [Clark 1953] [Imray] [Propeller/Propfan In-Flight Thrust Determination] [Blandeau and Joseph 2010]
High-speed vertical lift as a class
The configurations the X-76 competes with, compound helicopters, slowed rotors, lift fans and the vertical and short take-off and landing literature, the electric and hybrid vertical take-off and landing designs of the 2020s, and the recent high-speed vertical take-off and landing work this programme belongs to.
882 records. [Liu and Wang 2024] [Liu et al. 2023] [Cook and Gregory n.d.] [Doo et al. 2021] [Johnson et al. 2016] [Malpica et al. 2015] [Dugan 2014] [Fredericks et al. 2013] [DeSmidt et al. 2013] [Russell and Johnson 2012] [Kottapalli and Harris 2012] [Kottapalli and Harris 2010] [Silva et al. 2010] [Johnson et al. 2007] [Floros and Johnson 2007a] [Yeo and Johnson 2006b] [Franklin 2000] [Anderson and Lebacqz 1997] [Albers and Zuk 1992] [Farassat et al. 1991] [Stroub 1991] [Scott 1991b] [Detore and Conway 1991] [Rutherford et al. 1991] [Wilkerson et al. 1991] [Albers and Zuk 1990] [Anderson 1990] [Eisenberg 1990] [Franklin and Stortz 1989] [Wang and Talbot 1989] [Eskey and Wilson 1989] [Albers and Zuk 1988a] [McNally and Bach 1988] [Hoad et al. 1988] [McArdle 1988b] [Albers and Zuk 1988b] [Wang and Talbot 1987] [Albers and Zuk 1987b] [Kuhn 1987] [Franklin 1986] [Lord 1985] [White et al. 1985] [Beatty and Worthey 1984] [Sutton and Bennett 1984] [Hwang 1984] [Boles et al. 1984] [Nelms 1984] [Joppa and Parikh 1984] [Eskey et al. 1984] [Koenig 1984] [Hwang 1983] [Bailey et al. 1983] [Cheatham and Creason 1983] [Margason 1982] [Roberts and Deckert 1982] [Driggers et al. 1982] [Hwang and Diedrich 1981] [Wilson et al. 1981a] [Luidens et al. 1981] [Henderson and Walters 1981] [Aulehla and Kissel 1981] [Reber 1981] [Anderson 1981] [Williams and Ybarra 1981a] [Williams and Ybarra 1981b] [Miller et al. 1981] [Roberts et al. 1981] [Gerdes 1981] [Adelt 1981] [Roberts and Anderson 1981] [Brown 1981] [Lewis and Lewis 1981] [Lampkin 1980] [Roth et al. 1980] [Betzina and Falarski 1979] [Lowry 1979] [Deckert 1979] [Stockman 1979] [Whittely 1979] [V/STOL Flight Simulation 1979] [Falarski 1979] [Lewis et al. 1978] [Gerdes 1977] [Aiken et al. 1977] [Koenig et al. 1977] [Hoad and Gentry 1977] [Deckert 1977] [Preliminary Design of Propulsion 1977] [Olson 1977] [Willis and Genever-Watling 1977] [Aiken 1977] [Roberts and Anderson 1977] [V/STOL Conference Palo Alto 1977] [Sulkoske et al. 1977] [McCormick 1976] [Wilcox and Shovlin 1975] [Kefford and Munch 1975] [Newsom and Anglin 1975] [Grafton and Anglin 1975] [Hoad and Gentry 1975] [Stockman 1975b] [Deckert and Rolls 1974] [Stockman 1974] [Toney 1974] [Deckert and Holzhauser 1973] [Rae 1973] [Holzhauser et al. 1972] [Feistel et al. 1972] [Lowson 1972] [Androsky et al. 1972] [Holzhauser et al. 1971] [Heyson 1971] [Auer et al. 1971] [Swaim 1971] [Grafton and Newsom 1971] [Clough et al. 1971] [Chambers 1971] [Diedrich et al. 1971] [Jones 1971b] [Deal and Jenkins 1970] [Lieblein 1970a] [Barrack and Kirk 1970] [Margason 1970] [Heyson 1970] [Rae and Shindo 1969] [Bryson and Mehra 1969] [Carter 1969] [Deal and Jenkins 1969] [McKinney and Newsom 1968] [Barrack and Kirk 1968] [Kenyon 1968] [Fry 1968] [Wright 1968] [Campbell 1968] [Marsh 1967] [Hall et al. 1967a] [Cook and Hickey 1967] [Bryson and Mehra 1967] [McKinney and Newsom 1967] [Fry and Zabinsky 1967] [Deal et al. 1967] [Hammond and McLemore 1967] [Hall et al. 1967b] [Study on the Feasibility 1967] [Deckert and Hickey 1967] [Kuhn 1967] [Campbell 1967] [Reeder 1967] [Newsom 1967] [English et al. 1966] [McKinney et al. 1966] [Scientific and Technical Information Division 1966] [Anderson 1966] [Alford and Harris 1966] [Joppa 1966] [Dicarlo et al. 1966] [Freeman and Newsom 1966] [Garren and Kelly 1966] [Harper 1966] [Heyson and Grunwald 1966] [Joppa and Shindo 1965] [Cook and Hickey 1965] [Kuhn 1965] [Campbell 1965] [Maggitti 1965] [Kuhn et al. 1964] [Garren et al. 1964] [Quigley 1964] [Campbell 1964] [Kirby and Parlett 1964] [Drinkwater et al. 1964] [Goldsmith and Hickey 1963a] [Goldsmith and Hickey 1963b] [Alford et al. 1963] [Campbell 1963] [Turner and Drinkwater 1963] [Zimmermann 1963] [Huston et al. 1963] [McKinney and Newsom 1962] [Kelley 1962] [Kirby 1961] [O’Bryan 1961] [Luoma 1961] [Louma 1961] [Foster and Morris 1961] [Foster and Morris 1960] [Anderson 1960a] [Tapscott 1960] [Conference on V/Stol Aircraft 1960] [Anderson 1960b] [NASA Conference on V/STOL 1960] [Hilton et al. 1960] [Holzhauser and Innis 1960] [Whitten 1960] [Drinkwater 1960] [Alford and Luoma 1960] [Kuhn 1960] [Zimmerman 1960] [Zheng et al. 2026a] [Comer 2026] [Sarker et al. 2026] [Qiao and Zhou 2026] [Cao and Wang 2026] [Uppoor et al. 2025a] [Healy et al. 2026] [Panayotov and Zikyamov 2026] [Petrotto et al. 2026] [Abdullah and Husi 2026] [Uppoor and Chopra 2026] [Scaramal et al. 2026] [Dragos Daniel et al. 2026] [Jun et al. 2026] [Comer et al. 2026b] [Yang et al. 2026b] [Wang et al. 2026d] [Das Biswas et al. 2026] [Bhandari and Chakraborty 2026a] [Wang et al. 2026e] [Gainutdinov et al. 2026] [Liu et al. 2026b] [Teodorescu et al. 2026] [Elena 2026] [Žerajić et al. 2026] [Park and Park 2026] [Hu et al. 2026] [Uppoor et al. 2026] [Zhu et al. 2025a] [Technology et al. 2025] [Cheng et al. 2025a] [Ajaj et al. 2025] [Zhang et al. 2025a] [Jiang et al. 2025] [Neogi et al. 2025] [Wang et al. 2025f] [Wang et al. 2025g] [Jeong and Park 2025] [Riccardi et al. 2025] [Uppoor et al. 2025b] [Wang et al. 2025h] [Waśniewska et al. 2025] [Moustafa et al. 2025] [Wang et al. 2025i] [Shubert and Jones 2025] [Teodorescu and Chopra 2025] [Saetti 2025b] [Zhao et al. 2025b] [Prabhakar et al. 2025] [Li et al. 2025d] [Park and Park 2025] [Bhandari et al. 2025b] [Kim et al. 2025b] [Zhu et al. 2025d] [Giurca 2025] [Cheng et al. 2025c] [Zheng and Chopra 2025] [O’Brien and Delgado 2024] [Abdullayev 2024] [Lympany and Page 2024] [Yang et al. 2024a] [Zhu et al. 2024] [Wei et al. 2024] [Uppoor et al. 2024a] [Zhang and Qi 2024] [Yin et al. 2024] [Yang and Deng 2024] [Basgall et al. 2024] [Bennink and Langelaan 2024] [Lang et al. 2024a] [Scheu et al. 2024] [Adesh and Arun 2024] [Raamesh et al. 2024] [Mishra and Chakraborty 2024a] [Muraoka et al. 2024] [Kai 2024] [Halder et al. 2024] [Liu et al. 2024b] [Weiand et al. 2024] [Lang et al. 2024b] [Mishra and Chakraborty 2024b] [Song et al. 2024a] [Wang et al. 2024b] [Lang et al. 2024c] [Lee and Yee 2024] [Zhao et al. 2024c] [Sugawara et al. 2024] [Ali et al. 2024] [Lou et al. 2024] [Uppoor et al. 2024b] [Colli et al. 2024] [Panish and Bacic 2023] [Yin et al. 2023b] [Lu et al. 2023a] [Yang 2023] [Kim and Park 2023a] [Yin et al. 2023c] [Lykyanov and Adler 2023] [Wang et al. 2023b] [Mohd Ali et al. 2023] [Obertino et al. 2023] [Lampl and Armanini 2023] [Bhandari et al. 2023] [Kosyanchuk et al. 2023] [Berger et al. 2023] [Zhao et al. 2023b] [Rehman et al. 2023] [Arco et al. 2023] [Kim and Park 2023b] [Chapman et al. 2023] [Yin et al. 2023a] [Botre et al. 2023] [Escobar and Yeo 2023] [Zafi and Chakraborty 2023] [Deng et al. 2023] [Zhao et al. 2023d] [Wang et al. 2023c] [Zhang et al. 2023c] [Zhao et al. 2023e] [Delash 2023] [Qin 2023] [Virasak 2022] [Angelov and Holzapfel 2022] [Frey et al. 2021] [Berger et al. 2022a] [DiPalma et al. 2022] [Likhite 2022] [Valentine 2022] [Dikshit et al. 2022] [Zosimovych 2022] [Zhu et al. 2022] [Lee et al. 2022] [Zheng et al. 2022] [Ugwueze et al. 2022] [Escobar and Yeo 2022] [Seznec and Ivanoff 2022] [Chakraborty and Mishra 2022] [Zong et al. 2022] [Yang et al. 2022c] [Nadell et al. 2022] [Sims 2022] [Palaia et al. 2021] [Yan et al. 2021] [Costandin et al. 2021] [Öhrle et al. 2020] [Dollinger et al. 2021] [Marvakov and Holzapfel 2021] [Umapathy et al. 2021] [Wei et al. 2021] [Sugawara et al. 2021] [Vayalali et al. 2021] [Berger et al. 2021] [Govindarajan and Sridharan 2021] [Zheng et al. 2021] [Maurya et al. 2021a] [Faust et al. 2021] [Makkar et al. 2021] [Batrakov 2021] [Rodrigues et al. 2021] [Pölzlbauer et al. 2021] [Silva and Johnson 2021] [Wang et al. 2021a] [Jiang and Zhang 2021] [Hayama et al. 2021] [Mrusek 2021] [Maurya et al. 2021b] [Boling et al. 2020] [Habibnia et al. 2020] [Frey et al. 2020] [Zhou et al. 2020] [Wang et al. 2020a] [Stokkermans et al. 2020] [Klimchenko and Baeder 2020] [Jacobellis et al. 2019] [Zhang and Barakos 2020] [Chiariello et al. 2020] [Quackenbush et al. 2020a] [Stanisławski 2020] [Gao et al. 2020] [Zheng et al. 2020b] [Cakin et al. 2020] [Fatima et al. 2020] [Ye et al. 2020] [Ha et al. 2020] [Rodrigues et al. 2020] [Vayalali et al. 2020] [Wang et al. 2020d] [Greene 2020] [Maurya et al. 2020] [Zha et al. 2019] [Ernst et al. 2019] [Sushereba et al. 2019] [Quackenbush et al. 2019] [Frey et al. 2019] [Ondra et al. 2019] [Chan 2019] [Zaludin and Gires 2019] [Cornes 2019] [Sirica and Staubach 2019] [Öhrle et al. 2019] [Park and Schlaich 2019] [Ma et al. 2019] [Berger et al. 2019] [Uehara et al. 2019] [Suder 2019] [Myers et al. 2019] [Snyder and Tong 2019] [Joshi et al. 2019] [Wu and Chen 2019] [Pölzlbauer et al. 2019] [Makarov 2019] [Avera 2019] [Yuan et al. 2019] [Schrage and Patel 2019] [Wang et al. 2019b] [Schrage et al. 2018] [Sargent and Anemaat 2018] [Wang et al. 2018a] [Darmstadt and Robuck 2018] [Jacobellis et al. 2018] [Ng and Datta 2018] [Ma et al. 2018] [Öhrle et al. 2018] [Jiang and Zhang 2018] [DiPalma et al. 2018] [Bowen-Davies and Yeo 2018] [Cao et al. 2018] [Reddinger et al. 2018] [Cao et al. 2017a] [Yang and Wang 2017] [Ward et al. 2017] [Seung et al. 2017] [Drezner et al. 2017] [Ferguson et al. 2017] [Reddinger and Gandhi 2017a] [Bowen-Davies and Yeo 2017] [Horn et al. 2017] [Reddinger and Gandhi 2017b] [Park 2017] [Prasad and Choi 2017] [Pavlov 2016] [Thorsen and Horn 2016a] [Lee et al. 2016] [Feil et al. 2016] [Udroiu and Blaj 2016] [Potsdam et al. 2016] [Kuvshinov 2016] [Thorsen and Horn 2016b] [Haviland et al. 2016] [Ferguson and Thomson 2016] [Schrage and Arterburn 2016] [Wang et al. 2016] [Ferguson and Thomson 2015b] [Jiang and Zhang 2016a] [Jiang and Zhang 2016b] [Lim et al. 2015b] [Szulc et al. 2016] [Reddinger and Gandhi 2016] [Ormiston 2016] [Ormiston 2015] [Olcott 2016] [Schrage and Van 2015] [Silva-Martinez et al. 2015] [Thorsen and Horn 2015] [Bowen-Davies and Chopra 2015] [Zhang et al. 2015] [Jiang et al. 2015] [Coaxial Compound Helicopter Transition 2015] [Rand and Khromov 2013b] [Herbst et al. 2015] [Anikin et al. 2015] [Lim et al. 2015a] [Ferguson and Thomson 2015a] [Chase 2015] [Demers Bouchard et al. 2015] [Bentley and Sission 2015] [Sinsay and Alonso 2015] [Reddinger et al. 2015] [Ferguson and Thomson 2015c] [Reddinger and Gandhi 2015] [Brown et al. 2015b] [Ferguson and Thomson 2014] [Reddinger and Gandhi 2014] [Durbin et al. 2014] [Russell and Johnson 2014] [Paris et al. 2014] [Jehangir 2014] [Mesec 2014] [Giurca 2014] [Streich 2013] [Ferguson and Thomson 2013] [Rand and Khromov 2013a] [Datta et al. 2013] [Russell and Johnson 2013b] [Yeo 2013] [Bowen-Davies and Chopra 2013] [Hasbestan and Farsadi 2013] [Wang and Chen 2012] [Potsdam et al. 2012] [Moodie and Yeo 2012] [Berry and Chopra 2012] [Bastian et al. 2012] [Moodie and Yeo 2011] [Datta et al. 2011] [Coleman 2011] [Hall and Hall 2010] [Bevilaqua et al. 2010] [Girfanov and Pavlov 2010] [Moore 2010] [Transition Dynamics of VTOL 2010] [VTOL Aircraft Control Design 2010] [Ashok et al. 2010] [Ailon 2009] [Zhao et al. 2009] [Allan et al. 2009] [Yeo and Johnson 2009a] [Floros and Johnson 2009] [Guo and Horn 2009] [Horn and Guo 2008] [Kinzer 2008] [Yeo and Johnson 2007] [Floros and Johnson 2007b] [Córdoba G. 2007] [Yeo and Johnson 2006a] [Syrovy and Yassini 2005] [Wang and Zheng 2004] [Floros and Johnson 2004] [Carter 2004] [Gress 2003] [Aaron et al. 2003] [Samar et al. 2003] [Huang et al. 2003] [Floros and Johnson 2003] [LaBiche 2003] [Cioc et al. 2002] [Ashby et al. 2002] [Chana 2002] [Ashby and Eadie 2002] [Representative Operations of V/STOL 2002] [Newman and Orchard 2000] [Lyrintzis et al. 2000] [Orchard and Newman 1999] [Farassat and Brentner 1998] [Peters et al. 1997] [Hirschberg 1997] [Newman 1997] [Bühler and Newman 1996] [Strawn et al. 1995] [Kopra et al. 1994] [Rutherford et al. 1993b] [Oliver and Stanzione 1993] [Gerdes 1993] [Talbot et al. 1993] [Benger et al. 1993] [Strawn et al. 1993] [Soistmann 1992] [Bettner et al. 1992] [Stroub 1992] [Birckelbaw and Nelson 1992] [Conway 1991] [Talbot 1991] [Bettner et al. 1991] [Rutherford and Fitzpatrick 1991] [Low-Speed Aerodynamics 1991] [Scott 1991a] [Schneider and Wilkerson 1990] [Hirschkron and Hull 1990] [Talbot et al. 1990] [The Bell X-22A V/STOL 1990] [Yoo and Strash 1990] [Yoo and Strash 1989] [Schneider 1989] [Green and Andrews 1989] [Rosenstein 1989] [Niwa et al. 1989] [Lewis 1989] [Rosenthal et al. 1988] [Raymer 1988] [Hamilton and Richardson 1988] [Niwa and Sugiura 1987] [Albers and Zuk 1987a] [McArdle 1987] [Peterson and Sutter 1987] [Binkley 1986] [Sheridan 1986] [Mitchell and Hoh 1985] [Eshlemen 1985] [Bodson and Athans 1985] [Neitzel et al. 1985] [Sheridan 1985] [Moller 1985] [Green and Zanine 1984] [Neitzel et al. 1984] [De Melo and Singh 1984] [Chu et al. 1983] [Anderson 1983] [Durston and Schreiner 1983] [Tam 1983] [Griffin 1983] [Ray 1983] [Adelt 1983] [Kalemaris 1983] [Glasgow et al. 1983] [Calise and Kramer 1982] [Durbin and McGeer 1982] [Kuhn 1982] [Digital Engine Control 1982] [Arcidiacono et al. 1982] [Clark 1982] [Goldstein 1982] [Design Concepts for Minimizing 1981] [Bradfield 1981] [Willis 1981] [Durston and Smith 1981] [Wilson et al. 1981b] [Woollett 1981] [Lind and Tamplin 1981] [Crafa and Reed 1980] [Nishimura 1980] [Stewart 1980] [Arcidiacono et al. 1980] [Kress 1980] [Willis 1980a] [Willis 1980b] [Glasgow and Skarshaug 1980] [Reed 1980] [Caldwell and Lafavor 1980] [Foley and Woodrey 1980] [Stapleford 1980] [Hill and Jenkins 1979] [Defense Science Board Washington Dc 1979] [Kuhn 1979] [Stewart 1979] [Transition Aerodynamics for Close-Coupled 1979] [Chance Vought Corp Dallas Tx 1979] [Lebacqz and Radford 1978] [Corliss et al. 1978] [Limage 1978] [Steele and Aurora 1978] [Wolkovitch and Fortenbaugh 1978] [Nelms 1978] [Knott 1978] [Wilcox and Quigley 1978] [Wolkovitch and Brassell 1978] [Ringland and Craig 1977] [Corliss et al. 1977] [Sellers et al. 1977] [Zabinsky and Burnham 1977] [Kalemaris and Cea 1977] [Rolls and Aoyagi 1977] [Waesche and Migdal 1977] [Schmitz et al. 1977] [Feddersen and Cea 1977] [McLean and Naseem 1977] [Hudson 1977] [Knott 1977] [Gleiter 1976] [Reader and Wilkerson 1976] [Mark and Dehart 1976] [Vause et al. 1976] [Kanai et al. 1976] [Platzer and Margason 1976] [Louisse and Marshall 1976] [Rolls et al. 1976] [Lebacqz and Aiken 1975a] [Hill and Waters 1975] [Beattie 1975] [Zabinsky and Burnham 1975] [Waesche and Midgal 1975] [Zabinsky et al. 1975] [Salter 1975] [Winston et al. 1975] [Novak 1975] [Carlockmber and Sageior 1975] [Anderson and Wood 1974] [Stepniewski 1974] [Hill and Waters 1974] [Lander and Palcza 1974] [Henschel et al. 1974] [Louisse and Marshall 1974] [Campbell and Quinn 1974] [Byrnes et al. 1974] [Migdal 1973] [Campbell and Quinn 1973] [Lieblein et al. 1973] [Gertsma and Zigan 1973] [Daffer and Rogers 1973] [Clarke et al. 1973] [Salkind 1973] [Patton 1972] [Johnson et al. 1972] [Civil Compound Helicopter 1972] [Roelke and Zigan 1972] [O’Connor 1972] [Kohn 1972] [Wood 1972] [McElreath 1972] [Rudolph 1972] [Hall and Hodder 1971] [Hill 1971] [Hoffman et al. 1971] [Curtiss 1971] [Pruyn and Taylor 1971] [Bland 1971] [Jones 1971a] [Tulino et al. 1971] [Hartwig and Sonneborn 1971] [Mendela 1971] [Wolkovitch and Hoffman 1971] [V/STOL R and D 1971] [V/STOL 1971] [Hoffman 1971] [Diedrich 1971] [Lo 1971] [Balke 1970] [Lieblein 1970b] [Winborn 1970] [Skifstad 1970] [Bryson et al. 1970] [Sinacori 1970] [Curtiss 1970] [Sternfeld and Hinterkeuser 1970] [Szlenkier 1970] [Dukes 1970] [Tuck 1970] [Swaim 1970] [McIntire and Monson 1970] [Bosse et al. 1970] [Darling et al. 1970] [Deckert and Hickey 1970] [Lo 1970] [Ramnath 1970] [Bell Aerospace Co Buffalo Ny 1970] [Cruz et al. 1969] [Grahame 1969] [Fenaughty and Beno 1969] [Theriault 1969] [Swaim 1969] [Curtiss 1969] [Rogers et al. 1969] [Howze 1969] [Rhodes 1969] [Keller 1969] [Kemp 1969] [Michaels 1969] [Lockheed-Georgia Co Marietta 1969] [Simpson 1969] [Ramnath 1969] [Turner 1969] [Strand and Levinsky 1969] [Nichols 1968] [Beno 1968] [Kazan and Krause 1968] [Brown and Fisher 1968] [Wareing 1968] [Spreuer 1968a] [Spreuer 1968b] [Hall 1968] [Deal and Jenkins 1968] [Blackburn and Rita 1968] [Swaim and Connor 1968] [Levinsky et al. 1968] [PlCKERELL and Cresswell 1968] [Telford and Vasiloff 1968] [Beebe 1968] [Spooner 1968] [Grahame 1968] [Riesenfeld 1968] [Garner 1967] [True 1967] [Veno 1967] [Madden 1967] [Fry 1967] [Cole and England 1967] [Segner 1967] [Bagan 1967] [Overfield and Crawford 1967] [Rae 1967] [Kentfield 1967] [Oswalt 1967] [Kemp 1967] [Egerton and Fitzpatrick 1967] [Robbins 1967] [Haugen 1966] [Tindell 1966] [Statler 1966] [Van Wyckhouse 1966] [Coplin 1966] [Goldberger 1966] [Kutney 1966] [Duvivier 1966] [Litke 1966] [Steils 1966] [Nicholson and lowry 1966] [Kaufman 1965] [Brown 1965] [Pauli 1965] [Curtiss 1965a] [Jacobson 1965] [Curtiss 1965b] [Wyrick 1965] [Johnston and Friend 1965] [Blackburn 1965] [Patierno and Asdurian 1965] [Gallagher and O’Donnell 1965] [Beeler and Volk 1965] [Beeler 1965] [Peterson 1965] [Przedpelski 1965] [Coplin 1965] [Fradenburgh and Segel 1965] [Miller and Clark 1965] [Klingloff et al. 1965] [Rodenbaugh and Veno 1965] [Day 1965] [Foulke and Rhodes 1965] [Heintzman 1965] [Steils 1965] [Segner 1965] [Price 1964a] [Friend 1964] [Pauli 1964] [Stutz and Price 1964] [Jacobson 1964] [Schwartz and Shearer 1964] [George et al. 1964] [Ehrich and Glessner 1964] [Stepniewski and Schneider 1964] [Fradenburgh and Kiely 1964] [Kirby 1964] [Goland et al. 1964] [Hatta and Matsuki 1964] [Price 1964b] [Westbrook 1964] [Morris et al. 1964] [Sanders 1964] [Hill and Schmitt 1964] [Kutney 1964] [Butler and Thomas 1964] [Clark 1964] [Bergquist 1964] [Davies 1964] [Josephs 1964] [Peterson 1964] [Wells and Yinger 1964] [Henderson 1964] [General Electric Co Cincinnati Oh 1964] [Harned and Nay 1963] [Ostheimer and Giguere 1963] [Starkey and True 1963] [Drees 1963] [McIntyre 1963] [Corden and Everett 1963] [Marchese 1963] [Morris 1962] [Young 1961] [Brogan et al. 1961] [Muse 1961] [Nichols 1960] [Campbell 1960] [Richardson 1959] [Crim 1959] [Campbell 1959] [Doblhoff 1959] [Bloomfield 1959] [Nelson 1959] [Mallen and Dancik 1959] [Loewy and Yntema 1958] [McCormick and Mallen 1957] [O’Mallei 1957] [Zimmerman 1957] [Boeing Co Morton Pa Vertol Div 1956] [McCormick 1956] [Douglas 1956] [Irvin and Swan 1956] [Nelson 1956] [Desilets] [Cabarbaye] [Silva] [Helicopter and V/Stol Aircraft] [Harding] [Vertical/short takeoff and landing] [Sugawara and Tanabe 2019] [Wu et al. 2019b]
Hover, wake, downwash and the surface
Runway independence is a question about the air below the aircraft, and this cluster holds rotor hover performance, rotor wakes in and out of ground effect, brownout, and the effect of outwash on people and objects nearby.
277 records. [Felker et al. 1985] [Felker et al. 1986a] [Felker 1988] [Lemmon et al. 2026] [Apodaca Moreno 2018] [Ramasamy et al. 2018] [Tanner et al. 2015] [Burley et al. 2003] [Tung and Low 1997] [Quackenbush et al. 1993] [Baeder 1991] [Chung 1987] [Velkoff 1981] [Mineck 1977] [Wilson and Mineck 1974] [Carpenter and Paulnock 1949] [Rathod and Vemuri 2026] [Lee et al. 2026] [Tyler et al. 2026] [Min et al. 2026] [Wu et al. 2026a] [Mihaila et al. 2026] [Shahjahan and Ahuja 2026] [Feng et al. 2026] [Romander et al. 2026] [Gillespie and Carter 2026] [Zhang et al. 2026c] [Radotich 2026] [Deneke and Carter 2026] [Casablanca et al. 2025] [Wang et al. 2025e] [Georgiev 2025a] [Vijayaraj et al. 2025] [Arnold 2025] [Georgiev 2025b] [Sagaga and Lee 2025] [Branco et al. 2025] [Erhard et al. 2025] [Shankar et al. 2025] [Peters and Shirazi 2025] [Deneke and Carter 2025] [Chen et al. 2025b] [Cox-Gross and Collins 2025] [Erhard and Alonso 2024] [Jain 2024] [Caprace et al. 2024] [Morishita et al. 2024] [Gahlot and Sankar 2024] [Tinney and Valdez 2024] [Jung et al. 2024] [Sagaga and Lee 2023] [Son and Kim 2023] [Rovere et al. 2023] [Li et al. 2023] [Klimchenko et al. 2023] [Cordell et al. 2023] [Sheen et al. 2023] [Stratton et al. 2023] [Ghosh and Rajagopalan 2022] [Ramanujam and Abhishek 2022] [Arita et al. 2022] [Lemmon et al. 2022] [Yang et al. 2022b] [Wu et al. 2021] [Shouji et al. 2021a] [Chen and Hubner 2021a] [Shouji et al. 2021b] [Mobley et al. 2021] [Ignatkin et al. 2021] [Maldonado et al. 2021] [Cao et al. 2021] [Lee and Baeder 2021] [Smith et al. 2021] [Schwarz et al. 2020] [Suresh 2020] [Rovere et al. 2020] [Kumar and Vijayakumar 2020] [Berend 2020] [Sugawara et al. 2020] [Neumann et al. 2020] [Lee and Dassonville 2020] [Mehrabi and Davari 2020] [Lorenz 2020] [Li et al. 2020] [Schwarz et al. 2019] [Chen 2019a] [Bauknecht et al. 2019] [Lee and Dassonville 2019] [Gao and Agarwal 2019] [Calvert and Wenren 2019] [Quackenbush et al. 2018] [Stahl et al. 2018] [Jacobson and Smith 2018] [Jain 2018] [Kellen and Benedict 2018] [White et al. 2018] [Jiao et al. 2018] [Min and Wake 2018] [Eshcol et al. 2018] [Halder and Benedict 2018] [Rotor Downwash Modeling 2018] [Pickles et al. 2018] [Afzal and Malik 2018] [Tan et al. 2018] [Hariharan et al. 2017] [Quackenbush et al. 2017] [Songchao et al. 2017] [Chan 2017] [Overmeyer and Martin 2017] [Kalra and Baeder 2017] [Jimenez-Garcia and Barakos 2017] [Shahmiri 2017] [Ramasamy and Yamauchi 2017] [Milluzzo and Leishman 2017] [Jain 2016] [Goulos 2016] [Hooi et al. 2016] [Minervino et al. 2016] [Barakos and Jimenez-Garcia 2016] [On the Rotor Lifting 2016] [Govindarajan and Leishman 2016] [Min and Wake 2015] [Sankar et al. 2015] [Perrotta 2015] [Abras and Hariharan 2015] [Chin Gian Hooi et al. 2015] [Jimenez Garcia and Barakos 2015] [Jain 2015] [Ramasamy et al. 2015] [Zhao and Sheng 2015] [Xin et al. 2015] [Bhagwat et al. 2015] [Jain and Potsdam 2014] [Tritschler et al. 2014] [Leishman 2014] [Fei and Peters 2013] [Benedict et al. 2013] [Kalra et al. 2013] [Burrage 2013] [Sydney and Leishman 2013] [Syal and Leishman 2013a] [Govindarajan et al. 2013] [Syal and Leishman 2013b] [Alfred et al. 2013] [Garrick et al. 2013] [Tritschler et al. 2012] [Stargel and Landman 2012] [Cao et al. 2012] [Fei and Peters 2012] [Dehaeze and Barakos 2012] [Tritschler and Celi 2012] [Jasion and Shrimpton 2012] [Silva and Navair 2011] [Polzin et al. 2011] [Strong 2011] [Lohry et al. 2011] [van der Wall 2011] [Neiswander 2011] [Kalra et al. 2011] [Rotor in Vertical Flight 2011] [Gerlach 2011] [Tritschler et al. 2010] [Milluzzo and Leishman 2010] [Baeder et al. 2010] [D’Andrea and Scorcelletti 2010] [Fletcher and Brown 2010] [Yemenici et al. 2010] [Wong and Tanner 2010] [Ghosh et al. 2010] [Bohorquez et al. 2010] [Phillips et al. 2010] [Phillips and Brown 2009] [D’Andrea 2009] [Wenren and Steinhoff 2009] [Steinhoff et al. 2008] [Phillips and Brown 2008] [Tung and McAlister 2008] [Leishman 2008] [Wong 2008] [Keller et al. 2006] [Ramasamy and Leishman 2006] [Lakshminarayan et al. 2006] [Bhagwat et al. 2006] [Quackenbush and Wachspress 2006] [Allen 2006] [Vasilescu 2006] [Vasilescu and Dancila 2006] [Zhao et al. 2005] [Griffiths et al. 2005] [Pulla and Conlisk 2005] [Brown and Whitehouse 2004] [Allen 2004] [Saijo et al. 2003] [Bhattacharya et al. 2003] [Brown and Whitehouse 2003] [Bohorquez et al. 2003] [Cao and Su 2003] [Bhattacharyya and Conlisk 2003] [Griffiths and Leishman 2002] [Kim et al. 2002] [Leishman 2002] [Kini and Conlisk 2002] [Koratkar and Chopra 2002] [Kim et al. 2001] [Koratkar and Chopra 2001] [Hariharan and Sankar 2000] [Kang and Kwon 2000] [Egolf et al. 2000] [Cao 1999] [Harris 1999] [Conlisk 1999] [Kucab et al. 1999] [Martin et al. 1999] [Xin et al. 1998] [Smith 1996a] [Leishman and Bagai 1996] [McAlister 1996] [Hassenpflug 1996] [Adamczyk et al. 1996] [He and Lee 1995] [Johnston and Fleeter 1995] [Chen and Chopra 1995] [Bagai and Leishman 1995c] [Adamczyk et al. 1994] [Crouse and Leishman 1993] [Light 1993] [Ramachandran and Tung 1992] [Graber et al. 1991] [Light 1989] [Ramachandran et al. 1989] [Srinivasan and McCroskey 1988] [Splettstoesser et al. 1987] [Brand et al. 1986] [Desopper 1985] [Egolf and Landgrebe 1984] [Weller and Warmbrodt 1983] [Miller 1983] [Kawachi 1982] [Miller 1982] [Ballard et al. 1980] [Hah and Lakshminarayana 1980] [Kato and Yamane 1979] [Sheridan 1978] [Samant and Gray 1977] [Jenkins and Marks 1975] [Leese and Knight 1974] [Curtiss 1973] [Hohenemser and Crews 1973] [Landgrebe 1972] [Goodman and Lehman 1971] [Landgrebe 1971] [Rinehart 1970b] [Lehman 1971] [Rinehart 1970a] [Landgrebe 1969] [Fanucci et al. 1969] [Wright 1969] [Crimi 1965] [Leese 1964] [Ghareeb 1964] [Hazen and Seckel 1950] [Neiswander] [Quaranta] [Aerodynamic Interaction Study 1994] [Jain 2017] [Parwani and Coder 2018] [Chen et al. 2019b] [Chen et al. 2022] [Chen and Hubner 2021b] [Zala and Greenwood 2026] [Chen and Hubner 2020] [Sheng 2018] [Felker and Light 1986] [Young and Derby 2002] [Sankar et al. 1985] [Sankar et al. 1986] [Chen et al. 2024]
Conversion between hover and forward flight
The keystone’s own literature, and it is small. It holds the jet, ducted-propeller and fan models tested in transition in the 1950s and 1960s, and since 2020 mostly the transition control of small unmanned aircraft. The conversion of tiltrotors and tilt-wings is in the tiltrotor cluster above.
Of its 42 records, 20 are dated 2020 or later and 8 are dated 1969 or earlier, and 24 titles name an unmanned, micro or drone vehicle, 15 of them from 2020 on. No title in it names a rotor that stops.
42 records. [Kjerstad and Paulson 1993] [Gentry and Margason 1968] [Spreemann 1968] [Vogler 1966] [Spreemann 1966] [Kuhn and Vogler 1965] [Otis 1962] [Spreemann 1960] [Smith 1958b] [Xu et al. 2027] [Dony and Islam 2026] [Wang et al. 2026a] [Zheng et al. 2026c] [Zhou et al. 2025] [Fu et al. 2025a] [Fan et al. 2025] [de Paula et al. 2025] [INAV-Based Adaptive Transition Control 2025] [Fu et al. 2025b] [Zhao et al. 2025c] [Lee et al. 2025] [Pobikrowska and Goetzendorf-Grabowski 2025] [Ren and Zha 2024] [Lee and Kim 2024] [Zhao et al. 2024b] [Chen 2023] [Irmawan et al. 2023] [Yuksek and Inalhan 2022] [Safi’i et al. 2021] [Wang et al. 2019a] [Liu et al. 2018] [Yangping and Honggang 2018] [Yuksek et al. 2016] [Chu et al. 2010] [Chu et al. 2009] [Omar et al. 2007] [Verma and Junkins 2000] [Engelland 1991] [J. Victor Lebacqz; Edwin W. Aiken 1978] [Johnson and Craig 1976] [Key 1970] [Marchini]
Turboshafts, turbofans and the convertible engine
The engine families the register names, and the engine the X-76 does without. It holds the turboshaft and T700 literature, rotorcraft drive systems and variable-speed rotors, turbofan installed performance, and the convertible fan/shaft engine programmes of the 1970s and 1980s.
383 records. [Bellin and Brooks 1983] [Gill and Sauer 1983] [McArdle 1988a] [Howard et al. 2010] [Howard et al. 2008] [Howard 2007] [DellaCorte and Bruckner 2007] [McArdle et al. 1996] [Henry 1995] [Dangelo 1995] [Dimanlig et al. 1994] [Rashidi and Krantz 1992] [Folenta and Lebo 1988] [McArdle 1986] [Feasibility Study for Convertible 1985] [Goldstein et al. 1983] [Gill et al. 1982] [Eisenberg 1982] [McArdle and Wenzel 1981] [Wang et al. 2026c] [Piancastelli et al. 2026] [Han et al. 2026] [Arace et al. 2026] [Norouzi et al. 2026] [Li et al. 2026] [Saidi and Bechhoefer 2026] [Grönstedt and Paniagua 2026] [He et al. 2026] [Karabacak and Turan 2026] [Yang et al. 2025a] [Xiao and Tong 2025] [He et al. 2025] [Li et al. 2025a] [Han et al. 2025] [Jia et al. 2025a] [Tronconi et al. 2025] [Li et al. 2025c] [Jia et al. 2025b] [Günaltılı 2025] [Hao and Christopher 2025] [Yu et al. 2025b] [Yang et al. 2025b] [Li et al. 2025e] [Zhang et al. 2024b] [Zhang et al. 2024c] [Jakubowski and Jakliński 2024] [Sanapo et al. 2024] [Nie et al. 2024a] [Yang et al. 2024b] [Yang et al. 2024c] [Vladov et al. 2024a] [Vladov et al. 2024b] [Yuk et al. 2024] [Vladov et al. 2024c] [Bechhoefer and Hajimohammadali 2024] [Song et al. 2024c] [Yao et al. 2024] [Yazar 2024] [Siyahi et al. 2024] [Scheu et al. 2023] [Champion-Reaud 2023] [Castiglione et al. 2023] [Chandrasekaran and Hodges 2023] [Knapp 2023] [Bazmi and Rahimi 2023] [Han et al. 2023] [He et al. 2023] [Bechhoefer and Hajimohammadali 2023] [Lakshmi et al. 2023] [Filippone and Bojdo 2023] [Shang 2023] [Hansen 2023] [Lu et al. 2023b] [Gamble 2023] [Varga 2022] [Weigand 2022] [Yepifanov and Bondarenko 2022] [Choi et al. 2022] [Carcel et al. 2022] [Gu et al. 2022] [Weigand and Gachot 2022] [Chao et al. 2022] [Monahova 2022] [Chandrasekaran and Hodges 2022] [Anfossi et al. 2022] [Zhang et al. 2022b] [Catană et al. 2022] [Li et al. 2022] [Caldwell et al. 2021] [Zong et al. 2021] [Liu et al. 2021] [Bazmi and Rahimi 2021] [Popov et al. 2021] [Ferrand et al. 2021] [Ellis et al. 2021] [Gu et al. 2021] [Chandrasekaran and Hodges 2021] [Zhang et al. 2021] [Lytviak et al. 2021] [6ttl and Willinger 2021] [Wang et al. 2020c] [Varga and Barta 2020] [Sener et al. 2020] [Harder 2020] [Koruyucu et al. 2020] [Mortimer et al. 2020] [Radil and Berkebile 2020] [Ferrand et al. 2020] [Ellis et al. 2020] [Zhang and Gümmer 2020] [Wang et al. 2020e] [Öttl and Willinger 2020] [Spytek 2019] [Ott 2019] [Dibble et al. 2019a] [Chi et al. 2019] [Zhang et al. 2019b] [Dvirnyk et al. 2019] [Mathur et al. 2019] [Cornelius and Hannula 2019] [Czarnecki et al. 2019] [Min-ze et al. 2019] [Dibble et al. 2019b] [Liu and Liao 2019] [Bobula et al. 2019] [Kalabuhov et al. 2019] [Mao et al. 2019] [Zheng et al. 2018] [Habib et al. 2018] [Fuchs et al. 2018] [Ferrand et al. 2018] [Kang et al. 2018] [Song et al. 2018] [Shao-feng and Yu-chun 2018] [Yazar 2018] [Chen et al. 2018] [Mihalčová 2018] [Xie et al. 2018] [Turboprop/Turboshaft Engine 2018] [Stevens et al. 2018] [Tamm and Spyropoulos 2018] [Chavez et al. 2017] [Scott 2017] [Anderson et al. 2017] [James et al. 2017] [Liu and Luo 2017] [Kerler et al. 2016] [Jacob Boby and Raj Kumar 2016] [Sheng et al. 2016] [Abdulhamitbilal 2016] [Turan and Aydın 2016] [Amri et al. 2016] [Kozachyn et al. 2016] [Misté and Benini 2016] [Soares et al. 2015] [Stevens et al. 2015] [Goff et al. 2015] [Ali et al. 2015a] [Ali et al. 2015b] [Brown et al. 2015a] [Masse 2015] [Hudson 2015] [Sheldon et al. 2014] [Chen et al. 2014] [Luebs 2014] [Welsh et al. 2014] [Kröger et al. 2014] [Siller et al. 2014] [Hocko and Polansky 2014] [de la Calzada et al. 2013a] [Fakhre et al. 2013] [de la Calzada et al. 2013b] [Han and Smith 2013] [Koziol 2013] [Han et al. 2013] [Luis Fajardo Rodriguez and Botez 2012] [Rottach et al. 2012] [Kim and Varrey 2012] [Misté and Benini 2012] [Xiao and Zhu 2012] [Gounet and Lewy 2012] [Greatrix 2012] [Burguburu and Basset 2012] [Ashok et al. 2011] [Bowen-Davies and Chopra 2011] [Pakmehr et al. 2011] [Behbahani et al. 2011] [Belapurkar et al. 2011] [Kong and Koo 2011] [Heath et al. 2011] [Henriksson et al. 2011] [Jussaume 2011] [Han et al. 2011] [Vick et al. 2010] [DiOttavio and Friedmann 2010] [Zhang et al. 2010] [Attia et al. 2010] [Filippone and Bojdo 2010] [Vick et al. 2009] [Lewicki et al. 2009] [k.AL-Taie and S.Salah 2009] [Golden 2008] [Parker 2008] [Lewicki et al. 2008] [Kumar Cheeda et al. 2008] [Pisano et al. 2008] [Litt 2007] [Simon and Litt 2007] [Chalmers et al. 2007] [Author 2007] [Tammi et al. 2007] [Litt 2005] [Kilmain 2005] [Sonoda 2005] [Garhart 2005] [Hutson 2004] [Kim et al. 2003] [Author 2003a] [Valco et al. 2003] [Gmirya and Vinayak 2003] [Author 2003b] [Bussichella 2003] [Philhower 2002] [Weinberg and Wyzykowski 2001] [Ames and Henry 2000] [Meitner et al. 2000] [Nelson et al. 1999] [Kimbel 1999] [Henry 1999] [Sullivan 1999] [Cormier 1999] [Goodwin 1999] [Kaya 1998] [Moller et al. 1998] [Greendyke et al. 1997] [Green et al. 1997] [Quinn 1997] [Claveau / Frealle 1996] [Owen et al. 1996a] [Owen et al. 1996b] [Le et al. 1996] [Zhao et al. 1996] [Astridge 1996] [Duyar et al. 1995] [Chen et al. 1995] [Boyd and Murgia 1995] [Litt et al. 1995] [Egbert and McKain 1994] [Krantz 1994] [Frith 1994] [Iwata and Rock 1993] [Anderson et al. 1993] [Vogt and Sehra 1993] [Jarvis et al. 1993] [Henry 1992] [Krantz and Kish 1992] [Bossler and Heath 1992] [Lenski and Valco 1992] [Becker and Frounfelker 1992] [Duyar et al. 1992] [Oconnell 1992] [Blacodon and Lewy 1992] [Bill 1992] [Frith 1992] [Peluso 1992] [Kish 1991] [Weber et al. 1991] [Douglas 1991] [Elliott 1991] [Ockier and Celi 1991] [Vogt 1991] [Chen 1991] [Boyd and Murgia 1990] [Bill 1990] [Kish 1990] [Bossler and Heath 1990] [Johnson and Lindsay 1990] [Kastrineli and Lightfoot 1990] [Bettner 1990a] [Pyle and Aldrich 1990] [Ponomariov 1990] [Bettner 1990b] [Henry 1990] [Blacodon and Lewy 1990] [Nawrocki 1989] [Cosner and Rutledge 1989] [Jones et al. 1988] [Baghdadi 1987] [Biesiadny et al. 1987] [Drago and Mack 1987] [Davis 1987] [Dugas 1986] [Guedel and Farrando 1986] [Pfeil 1986] [Pfeil et al. 1986] [Giraud 1986] [Hirschkron and Russo 1986] [Karamanlis et al. 1985] [Manningham 1985] [Rogo and Benstein 1985] [Hirschkron et al. 1984] [Gilmore 1984] [Klann et al. 1984] [Przedpelski 1984] [Pfeil et al. 1984] [Davis 1983] [Jasas and Fourny 1983] [Nagata et al. 1983] [Wansong 1983] [Goree 1983] [Corliss 1982] [Sellers et al. 1982] [McArdle and Wenzel 1982] [Dangelmaier 1982] [Brooks and Abdalla 1982] [Brooks 1979b] [Compagnon 1980] [Pisano 1979b] [Piscopo et al. 1980] [Kuo 1979] [Curran and Levine 1979] [Pisano 1979a] [Hogg 1979] [Zaretsky et al. 1979] [Millar et al. 1979] [Brooks 1979a] [Brooks 1979c] [Flood and Cartwright 1977] [McKenzie and Bayne 1976] [Soule and Hixson 1976] [Greene et al. 1976] [Stockman 1975a] [Alwang and McLain 1974] [Vance 1974] [Curran 1974] [Neate 1974] [Veno 1974] [Scoppe 1973] [Curran 1973] [Crawford 1973] [Bentele and Laborde 1972] [Neate 1972] [RS 360 Turboshaft Engine 1972] [L’Ecuyer et al. 1971] [Browne et al. 1971] [Wright and Jones 1970] [Lecuyer 1970] [Hall 1970] [Johansen and Duncan 1970] [Rodenbaugh 1969] [Edkins 1969] [Leutzinger 1968] [Lavi 1967] [Gaffin and Wilcox 1967] [Lavi 1966] [Sonder 1965] [Fitzwilliams 1965] [Rowe 1965] [Daniel 1964] [Smith 1963] [Bridgnell and Walters 1962] [Ritter and Ordway 1962] [Ehrich 1961] [Gunderson 1961] [Ferris 1961] [Rasmussen 1960] [Kappus 1959] [Munter 1954] [A Guide to Extending] [Air Bleed Objective for] [Design Considerations for Enclosed] [Chalmers] [Instrumentation Requirements for Turboshaft] [Spack] [Okelah] [Rotorcraft Turboshaft Engine Idle] [Standard Indoor Method of] [Turboshaft/Turboprop Gas Turbine Engine] [Bayoumi et al. 2003] [Atkinson and Raymond 1968] [Seery 1969] [l’Anson 1969] [Abdalla et al. 1988]
Rotorcraft conceptual design and sizing
The tools that turn an envelope into an aircraft, including the National Aeronautics and Space Administration’s rotorcraft design and analysis code and the sizing methods for tiltrotor and other vertical lift concepts.
73 records. [Peters 2025] [Johnson 2024a] [Johnson 2024b] [Johnson 2024c] [Johnson 2023b] [Johnson 2023a] [Johnson 2023c] [Johnson 2022b] [Johnson 2022a] [Johnson 2022c] [Johnson 2019] [Danis et al. 2018] [Silva et al. 2018] [Johnson 2018a] [Johnson 2018b] [Johnson 2017a] [Johnson 2017b] [Lawrence et al. 2016a] [Johnson 2016b] [Johnson 2016c] [Johnson 2016a] [Johnson 2016d] [Johnson 2015] [Johnson et al. 2014] [Johnson 2014] [Johnson 2010b] [Johnson 2010a] [Johnson 2009] [vanAken and Sinsay 2006] [Teerawathananon et al. 2026] [Park et al. 2026] [Johnson 2025a] [Johnson 2025b] [Johnson 2025c] [Bhandari et al. 2025a] [Orrick 2024] [Ahn et al. 2024] [Pipenberg et al. 2022] [Zanoni et al. 2022] [Ibacoglu et al. 2022] [Lakkis and Bil 2021] [Oh et al. 2021] [Zahoor et al. 2020] [Schwinn et al. 2020] [Scott et al. 2019] [Palaia et al. 2019] [Khurana et al. 2019] [Gerosa et al. 2018] [Lawrence et al. 2018] [Tyan et al. 2017] [Lim et al. 2017] [Gallaher 2017] [Cao et al. 2016] [Lawrence et al. 2016b] [Russell and Basset 2015] [Lim et al. 2014] [Kalra et al. 2012] [Sartorius 2011] [Sinsay and Nunez 2010] [Keith and Hall 2009] [Choi 2009] [Hirsh et al. 2007] [Ganguli 2004] [Rand and Khromov 2004] [Bennett et al. 2001b] [Frederick et al. 1999] [Bona et al. 1996] [Aiken et al. 1992] [Gabriele 1991] [Cox and Roskam 1990] [Huston 1989] [Logan 1989] [Meier and Olson 1988]
The missions the solicitation names
Special operations airlift, personnel recovery, combat search and rescue and agile combat employment, the uses the solicitation and the budget books give for an aircraft with speed and runway independence, with the runway-independent aircraft literature of the early 2000s.
44 records. [Developing Combat Support Mission 2025] [Assessing Agile Combat Employment 2024] [Pierce and Komives 2024] [Advancing Combat Support 2023] [The Forces We Need 2023] [Qingsong et al. 2020] [Lubiejewski 2019] [Mouton et al. 2019] [Air Force Studies Board et al. 2018] [Lewis 2017] [Newton and Searle 2016] [Michalek 2012] [Rowell 2012] [Barr 2011] [Galdorisi and Phillips 2011] [Smith 2011] [DiVittorio 2010] [Looney 2009] [Whitcomb 2006] [Xue and Atkins 2006] [Xue and Atkins 2005] [DePalo 2005] [Nelson 2004] [Atkins and Xue 2004] [Joglekar et al. 2003] [Xue and Atkins 2003] [Margason 2002] [Ezell and Higman 2002] [Burlein et al. 2002] [Spivey 2002] [Hall and Cummings 2002] [Peterson et al. 2001] [Hansen 2001] [Secretary Of The Air Force Washington Dc 2000] [Thompson 1999] [Currie 1999] [Zahrt 1996] [Watkins 1991] [Chisman 1991] [Mullarky 1990] [Lake 1990] [Bone 1988] [Mills 1988] [Brynn and Geesey 1976]
Research aircraft and their flight test
The practice the X-76 joins. It holds X-plane and research aircraft programmes, the flight test of tiltrotor and other vertical lift research aircraft, and accounts of what research aircraft have contributed to technology development.
99 records. [Spivey et al. n.d.] [Hall and Morris 1985] [Hall and Morris 1984] [Erickson et al. 1984] [Hall and Merrill 1983] [Merrill and Hall 1982] [Diehl 1978] [Mineck and Freeman 1977a] [Mineck and Freeman 1977b] [Lebacqz and Aiken 1975b] [Predesign Report 1972] [Linden 1972] [Schmidt and Linden 1972] [Smith 1961a] [Smith 1961b] [Smith 1959] [Smith 1958a] [Rothaupt et al. 2026] [Ghanchi and Gururajan 2026] [Hammer et al. 2026] [Ossyra et al. 2025] [Comer et al. 2025] [Dehennis 2025] [Pisano et al. 2025] [Gao et al. 2025a] [Bouwer and Ignatuk 2025a] [Bouwer and Ignatuk 2025b] [Hall and Merrett 2025] [Carter et al. 2024] [Makhtar et al. 2024] [Kier 2023] [Jusko et al. 2022] [Takarics and Vanek 2021] [Kyoung-Moo Min et al and Tjprc 2019] [Bouwer and Kaiser 2019] [Warsop and Crowther 2019] [Beh et al. 2018] [Feil et al. 2017] [Öznalbant et al. 2016] [Schaefer 2016] [Filho and de Andrade 2016] [Öznalbant and Kavsaoglu 2015] [Schafer et al. 2015] [Kanayath et al. 2012] [Boeing Flies Blended Wing 2008] [Blackwell and Millott 2008] [Ishikawa et al. 2008] [Niazi et al. 2006] [Toupet and Mettler 2006] [Grady et al. 2006] [Merret and Bragg 2003] [Vos et al. 2002] [Robertson 2000] [Shane 1992] [Yamato et al. 1991] [Ray et al. 1990] [Immenschuh 1990] [Murray 1990] [The Canadair CL-84 Experimental 1990] [Nichols 1990] [Davis 1989] [Zammit and Zwaanenburg 1989] [Yamauchi et al. 1988] [Yamato et al. 1988] [Hindson 1987] [Hicks and Matheny 1987] [Smith et al. 1987] [Chin et al. 1987] [Wang et al. 1986] [Weeks 1986] [Sefic and Cutler 1986] [Wolkovitch 1984] [Acree 1984] [Szalai 1984] [Painter and Erickson 1984] [Painter 1983] [Jackson and Coyle 1983] [Griffin and Jonas 1983] [Spacht 1983] [Rosenthal 1982] [Acree 1982] [Abbott et al. 1982] [Englar et al. 1981] [Riddle et al. 1981] [Burks 1981] [Clark 1980] [Design of the Circulation 1979] [Flight Test 1979] [Lebacqz and Chen 1977] [Armstrong 1977] [Nagy and Kirsten 1976] [Linden and Hellyar 1974] [Spitzer et al. 1972] [Pittsburgh Univ Washington DC Research Staff 1966] [Hirsh 1965] [Sanderson 1965] [Pfeiff 1965] [Wang] [Hamel 2012]
Where the Framing Breaks Down
The aircraft’s mass is the unknown that every envelope here is drawn around. The hover weights, the power fractions, the engine mass fraction and the required lift-to-drag ratio are all functions of a gross weight that is not public, and the inferences drawn from them about where the X-76 lies are inferences.
The turbofan’s lapse is assumed. The drag-area ceiling is exact in its algebra and approximate in its input, since the factor $\varphi$ is swept rather than known, and a real turbofan’s lapse is not a pure function of density. The altitude independence of the ceiling is exactly as good as that assumption.
The hover assumptions are typical rather than measured. A figure of merit of 0.75, a drive efficiency of 0.90 and a download of 10 percent are reasonable for a tiltrotor, and the X-76’s proprotors, which must fold, may be less efficient in hover than an optimised proprotor. The turboshafts’ hot-day lapse is not modelled at all, so every hot-day hover weight above is high by an unknown amount.
The proprotor’s speed limit is taken from compressibility alone. Whirl flutter, which the historical record names as the reason the first stop-fold tests stopped the rotor, is cited and not computed [The History of the XV-15 Tilt Rotor Research Aircraft], and for a particular aircraft it may bind at a lower speed than the helical tip Mach number does. The 0.85 limit is an assumption.
The register’s engine cell is the only configuration fact attributed to Department of Defense records, its plus sign is unexplained, and the turbofan count of one is a reading. With $n_F$ turbofans the drag ceiling is
\[f_{\max} = \frac{2\, n_F\, F_0\, \varphi}{\rho_0 V^2}, \tag{40}\]so if the X-76 carries two turbofans, the drag budget doubles and the certificate point disappears, and no source this article found excludes that.
And the patents describe embodiments of a company’s work, not the X-76. They are cited for what Bell has filed and for the problems those filings address, and no sentence here claims that any patented mechanism is fitted to the aircraft.
The Source Base
This article rests on a broad base of government primary documents, and almost all of them are about the programme rather than the aircraft. The solicitation, its slides and its questions and answers were read from the contracting portal [SPRINT broad agency announcement] [SPRINT proposers day slides] [SPRINT questions and answers]. Four budget justification books were read in full for the programme’s entries. The award record was read by contract and by transaction, with three first-phase contracts and the 2008 study found and Bell’s instruments not found. Aurora’s two releases of 2024 were read for the competitor’s propulsion and schedule. The designating instruction of 2020 was read for its definition of a design number, and the three flight-standard documents the solicitation names were identified from their catalogue entries and not read. DARPA’s programme page was read at its current version and as archived on 24 December 2024, 12 May 2025, 10 July 2025 and 12 December 2025 [DARPA SPRINT programme page, as archived on 12 May 2025] [DARPA SPRINT programme page, as archived on 10 July 2025], the last three days before this article’s date, and every statement about the programme as it stood at the date rests on that capture.
Apart from DARPA’s picture, the engine certification documents are the only primary documents about the aircraft’s hardware. They are the European Union Aviation Safety Agency’s data sheets and the New Zealand regulator’s two type acceptance reports, the latter dated 2007 and 2020 and so inside this article’s date, read because the Federal Aviation Administration’s and Transport Canada’s own sheets were not retrieved, together with General Electric’s certification releases of 2000 and 2004. The New Zealand report on the PW308 gives its take-off rating in pounds and agrees with the European sheet’s kilonewtons to within a pound, which is the only cross-check of a rating this article could make between two regulators. DARPA’s artist’s concept of the X-76 was read as an image, and the reading is stated as a reading of a picture. The register, whose compiler attributes every cell of the row but the description to Department of Defense records, is the only document naming the engines, read at its current version and at the three archived copies that bracket the row’s first appearance.
Bell’s releases were read from Bell’s newsroom and, for two of them, from Textron’s investor-relations mirror, which carries the two wrong datelines described above. Fourteen of Bell’s patent publications were read for their abstracts and are cited for nothing their abstracts do not say. The National Aeronautics and Space Administration history of the XV-15 was read for its account of the 1972 folding rotor test, its appendix specifications and its chronology, and seventeen research primaries were read for their abstracts, and one of them, the 1985 XV-15 rotor hover test, in part for its text.
One document the article would most like to have read could not be. Bell’s Phase 1 and Phase 2 instruments, presumably other transactions, are not in the award record, so the value of the contract that is building the X-76 is not known to this article.
The Definition of Primary
Primacy is a property of the document, and this survey derives it from the identifier. A record is a report primary when its address is on the National Aeronautics and Space Administration’s Technical Reports Server or it carries a Defense Technical Information Center identifier, being an address at dtic.mil or a digital object identifier under the 10.21236 prefix. Of the 3,412 research records, 714, or 20.9 percent, are report primaries under that rule, most of them in the tiltrotor cluster, 284, and the high-speed vertical lift cluster, 237. The rule reaches 8 of the 17 research primaries this article read for their abstracts, among them the 1972 folding rotor test report, the Ames hover tests and the convertible engine stand test, and not the other 9, which are society and journal papers such as Engle and Sambell’s of 1969 and Bell’s of 2025, so 20.9 percent is a lower bound on how much of the survey is first-hand.
Thin Subjects
Six subjects that this article’s derivations depend on have thin literatures. Each count below is the number of research records in this survey whose title carries at least one of the listed terms, with a hyphen or a slash read as a space.
| Subject | Title terms counted | Records |
|---|---|---|
| the thrust lapse of a turbofan with altitude and speed | thrust lapse, lapse rate, lapse | 0 |
| the helical tip Mach number of a propeller or proprotor | helical tip | 3 |
| the hover figure of merit | figure of merit, figures of merit | 2 |
| the conversion corridor | conversion corridor, conversion corridors, transition corridor, transition corridors | 7 |
| the weight of an engine | engine weight, engine mass, powerplant weight | 4 |
| restarting a turboshaft | restart, relight, airstart | 3 |
No title names a turbofan’s thrust lapse, so the factor $\varphi$ of The Jet Is a Drag Budget is swept as an assumption because the literature gives the article nothing to take it from.
The helical tip Mach number is a propeller acoustician’s variable. The 3 titles that name it are all on the noise of propellers and propfans, and none names a proprotor, so the speed limit of The Proprotor’s Speed Limit Forces the Rotor to Stop applies a propeller variable to a proprotor.
Two titles name a figure of merit, and neither names a tiltrotor or a proprotor, so the hover table’s figure of merit of 0.75 is an assumption in the literature’s titles as well as in the text.
The conversion corridor is named in 7 titles, 6 of them on tiltrotors and tilt-wings and 1 on a short take-off and vertical landing propulsion system, and none on a rotor that stops and folds, so the conversion band derived above has no published counterpart for the stop-fold configuration.
Four titles name the weight or mass of an engine, all of them turboshafts or rotorcraft powerplants, and none a turbofan, so the engine mass fraction of The Engines Alone Are a Sixth of the Heaviest Aeroplane rests on certificated dry masses and not on a weight model.
Three titles name a turboshaft restart, two of them sharing one title, and all are about the engine on its own, so the restart before the rotors are unfolded that the section on dependent systems names is not a subject of any title.
What the Survey Admits
A record is admitted only when a person reading its title finds it on this article’s subject, meaning that the title bears on a subject the argument above uses. The subject’s vocabulary is rich in homonyms, and the excluded classes show it. T700 names a carbon fibre and a steel grade as well as a turboshaft family, propeller names the propellers of ships and outboard motors and molecular propellers, hover names a manoeuvre in wireless communication, flutter is also a disorder of the heart, and austere environments, brownout, outwash, convertible and conversion corridor belong also to medicine, power grids, glaciology, finance and land use. Rotor wing also means a helicopter in the literature of medical transport, a rotor wake is also the wake of a compressor or fan rotor, and the vertical take-off and landing aircraft of nonlinear control theory is a planar benchmark model and not an aircraft. Titles that apply the subject to something the argument does not use are excluded too, such as cabin and interior noise, icing, crashworthiness and escape, avionics and cockpit displays, radar and infrared signatures, batteries, fuels and emissions, maintenance, air traffic and vertiport operations, and the path planning of small unmanned aircraft. Correction, erratum and withdrawal notices, news items, book reviews, supplementary video files, and dictionary and encyclopedia entries of two pages or fewer are excluded because they are not research works.
Some records of doubtful relevance are kept. The downwash of agricultural spraying aircraft and the sediment entrained by a rotor’s downwash are kept because their subject is the flow below a rotor, turboshafts in ships and heavy equipment because their subject is the engine, a stopped-rotor concept for Venus because it is a stopped rotor, histories and procurement studies of the V-22 and of Future Vertical Lift because this article discusses procurement, and control displays and airspeed sensors for vertical take-off and landing aircraft because they bear on handling qualities. A reader may weigh each accordingly. No cluster is a residual, since each is named for a subject the argument uses.
Every research title has been read for relevance, so the off-topic share that remains is a matter of reading judgement. A reading of titles cannot show that a work is relevant in substance, so this is a statement about titles only.
Epistemic State
The Article’s Own Vantage Point
The article is dated 15 December 2025 and written on 2 October 2026. The allocation of the designation happened inside its dateline, 56 days before it. The designation’s publication did not, the register first showing the row between 15 January and 1 February 2026 and DARPA announcing it on 9 March 2026. Everything this article reports about the programme from government documents of March 2023 through June 2025 was public at its date. Everything it reports about the aircraft’s name, critical design review and current schedule was not.
Historical Fact, From Primary Documents
- The X-76A was allocated on 20 October 2025 to Bell Textron, sponsor DARPA, with the engine cell
2 GE CT7-8, PW308C+and a description marked as the compiler’s. - DARPA posted solicitation HR001123S0031 in March 2023 with the demonstrator guidance, mission and engine rule as quoted, a 42-month goal to first flight, and a Phase 1 budget of 75 million dollars.
- Three first-phase contracts are in the award record with the dates, values and offer count stated, and a 2008 DARPA stop-fold tilt rotor study to the Bell Boeing Joint Project Office is too.
- The budget books carry the figures, wording and plans as tabulated and quoted.
- The CT7-8 and PW308C ratings and masses are as their data sheets state, and the PW308C is approved for multiple-engine installation only.
- A folding 25-foot proprotor was stopped and started more than forty times in a full-scale wind tunnel test in 1972, and the concept was then set aside for weight, complexity and the lack of a developed convertible engine.
- DARPA and the National Aeronautics and Space Administration funded a convertible turbofan-turboshaft engine programme beginning on 13 May 1981.
- Both Phase 1B designs carried existing turbofan and turboshaft engines, Aurora’s by its own release of October 2024.
- The CT7-8 was approved by the Federal Aviation Administration on 29 September 2000, and the PW308C’s primary certificate is Transport Canada’s E-31.
Measured From the Documents Rather Than Asserted by Them
- The row’s first public appearance, between 15 January and 1 February 2026, by archive capture.
- The absence of any Bell instrument from the award record under the searches described.
- The three-month disagreement among DARPA’s and Bell’s statements on when Phase 2 began.
- The one-year dateline errors on Textron’s mirror of two releases.
- The count of 23 other register rows powered by T700 or CT7 engines and the absence of any other turboshaft and turbofan pairing, in the copy of the register last updated on 23 August 2026.
Engineering Analysis, Derived Here and Checkable
- The hover envelope of two CT7-8s across disk loading, at the stated figure of merit, drive efficiency and download.
- The drag-area ceiling $f_{\max} = 2 F_0 \varphi / (\rho_0 V^2)$ and its independence of altitude under the stated lapse model.
- The required lift-to-drag ratios across the solicitation’s weight and altitude bands.
- The helical tip Mach numbers at the XV-15’s tip speed and the tip speed reductions needed to hold 0.85.
- The engine mass fractions of 0.163 and 0.306 at the solicitation’s weight limits.
- The schedule slip of at least eight months against the solicitation’s goal.
Inference, Stated as Such
- That the X-76 is heavier than 15,000 pounds or near it, from the engine mass fraction alone, since the hover power margin admits a heavier aircraft, a large margin or a high disk loading and does not choose between them.
- That it hovers at a disk loading well above a conventional tiltrotor’s, from the stowed-blade geometry and the absence of a disk loading limit.
- That it carries one turbofan, from the register cell read literally and the renderings.
- That it is uncrewed, from the compiler’s description, the solicitation’s flight termination clause and the budget book’s ground station.
- That Bell’s instruments are other transactions, from the solicitation’s permission and the award record’s silence.
- That the existing-engine rule is why the X-76 has separate lift and cruise engines rather than the convertible engine the earlier literature preferred, a reading the competitor’s identical choice supports.
What the Record Does Not Settle
What the plus sign after the turbofan means. How many turbofans are fitted. The aircraft’s gross weight, rotor diameter, wing area and drag. Whether the turboshafts run in cruise. Whether any patented drive or fold mechanism is fitted. The value of Bell’s contract. And the keystone itself, since no stop-fold aircraft has converted in flight in any record read here.
Statements in This Article That Postdate Its Own Date
- The register’s publication of the X-76A row, between 15 January and 1 February 2026.
- DARPA’s and Bell’s announcements of 9 March 2026, with the designation, the critical design review, the programme manager’s rank, the 1776 statement and the plan for flight testing in early 2028.
- DARPA’s programme page in its current form, and DARPA’s artist’s concept of the X-76, whose single exhaust and absent cockpit glazing are read here.
- The fiscal year 2027 budget book of April 2026, its figures for fiscal years 2025 through 2027, and its plans, each marked where used.
- The CT7 data sheet’s issue 10, dated 19 December 2025, four days after the date, whose base-model ratings are used.
- The defence journalism of March 2026 [Air and Space Forces on the X-76] [The War Zone on the X-76] [The Aviationist on the X-76].
- The award record, read in October 2026, whose totals include modifications through August 2025 and are therefore current totals rather than totals as they stood at any one earlier date.
- The literature survey, drawn from current indexes and including records dated to 2026 and one dated to 2027 by its publisher’s metadata.
Out of Scope
The designation’s number. Why this aircraft is the X-76 and not the X-69 is the X-69 through X-75 article’s subject and is not reargued here.
The operational aircraft. The solicitation’s operational system, its 5,000 pound payload and its cargo bay are described because they bound the demonstrator, and the operational aircraft’s sizing, which would need a mission fuel analysis, is not attempted.
Aeroelastic analysis. Whirl flutter and the stopped-blade instabilities are cited as the reasons the configuration exists and as risks to its conversion, and neither is computed, since both need structural properties that are not public.
Acoustics and signatures. The literature on tiltrotor noise is in the survey because it is part of the tiltrotor’s literature, and the X-76’s acoustic or other signatures are not treated.
The competing configurations. Aurora’s Phase 1 design is described here only for its propulsion and schedule, from Aurora’s releases, and the Phase 1A designs of Northrop Grumman and Piasecki are not described in any primary document read here. The comparative literature on high-speed rotorcraft concepts is cited without being used to rank them.
The procurement that would follow, a question about the services’ budgets rather than about an aeroplane.
Conclusion
The X-76 is a demonstrator built to answer one question, whether an aircraft can hover over an unprepared surface and then cruise at 400 knots or more, and its answer is to carry two propulsion systems and use them one at a time. Two CT7-8 turboshafts lift it on proprotors, a PW308C turbofan pushes it once those proprotors have been stopped and folded, and the register’s engine cell, the only configuration fact in the public record attributed to Department of Defense records, says so in one short line that ends in an unexplained plus sign.
The certificated ratings of those engines bound the aircraft from both ends without its mass, through the relations derived in Sizing From First Principles. At the assumed hover efficiencies, the turboshafts’ 3,758 kilowatts would hover about 30,800 pounds at the XV-15’s disk loading, twice the solicitation’s heaviest guidance, so either the X-76 is heavier than its guidance, or it hovers with a large margin, or its proprotors are small and its disk loading high. The turbofan’s sea-level thrust fixes the largest equivalent drag area the aircraft can carry at 400 knots, 0.60 to 0.84 square metres across the assumed lapse, and the density cancels, so that ceiling is the same at every altitude in the solicitation’s band. The folded configuration has to fit inside it. And the engines alone are a sixth of the solicitation’s heaviest aircraft, which is the price of carrying two systems.
The concept is at least sixty years old in the open literature and was shown at full scale in a wind tunnel in 1972, when a folding 25-foot proprotor was stopped and started more than forty times. It was then set aside for its weight, its complexity, and the lack of a convertible engine that could drive rotors and make jet thrust in one machine. The 1980s built that engine and proposed folding tiltrotor demonstrators around it, and none was built. The X-76 accepts the weight and the complexity and goes around the engine, because its solicitation required existing engines so that engine development could not delay first flight. The earlier literature judged separate lift and cruise engines the heavier choice, and the X-76 makes it anyway. The solicitation’s existing-engine rule explains why, and the competing finalist’s identical choice, a turbofan and a turboshaft in a fan-in-wing aircraft, supports the reading that the rule and not the configuration drove it.
On 15 December 2025 nothing had flown, the designation was not public, and the schedule had moved by at least eight months against the solicitation’s goal. The programme’s documents disagree on when its second phase began, a contractor’s mirror misdates two of its releases by a year, and the contract that is building the aircraft was not found in the public award record. The question the X-76 exists to answer, the conversion, remains open, because hovering and fast cruise have each been done and the sequence between them, in flight, with a real wing and a real jet, has not.
Equations
This section collects the 40 display equations of the article in the order they appear, each under its number and reproduced exactly as it stands in the text. A title in bold names an established result, and a title in italics beginning with the word Bespoke names a construction made for this analysis. Of the 40, 26 are established and 14 are bespoke. The relations are evaluated in the International System while weights are quoted in pounds, disk loadings in pounds per square foot and speeds in knots as the solicitation states them, and the hover results rest on an assumed figure of merit of 0.75, drive efficiency of 0.90 and download of 10 percent, while the cruise results rest on a thrust lapse factor swept from 0.5 to 0.7.
Equation 1, Ideal Induced Power in Hover. Momentum theory gives the induced power of an ideal rotor system as the weight to the three-halves power over the square root of twice the density times the disk area.
\[P_{\mathrm{ideal}} = \frac{W^{3/2}}{\sqrt{2 \rho A}}, \tag{1}\]Equation 2, Effect of Doubling the Disk Area on Ideal Power. At fixed weight and density, doubling the disk area multiplies the ideal induced power by the reciprocal of the square root of two, a saving of 29 percent.
\[\frac{P_{\mathrm{ideal}}(2A)}{P_{\mathrm{ideal}}(A)} = \frac{1}{\sqrt{2}} = 0.707, \tag{2}\]Equation 3, Publication and Announcement Lags of the Register Row. The archived copies of the register place the row’s first public appearance 31 to 48 days after the article’s date and 87 to 104 days after the allocation, and the announcement came 84 days after the article’s date. Parsch, DOD 4120.15-L Addendum, as archived on 10 December 2025 Parsch, DOD 4120.15-L Addendum
\[t_{\mathrm{pub}} - t_{\mathrm{d}} \in [\,31,\ 48\,]\ \text{days}, \qquad t_{\mathrm{pub}} - t_{\mathrm{a}} \in [\,87,\ 104\,]\ \text{days}, \qquad t_{\mathrm{DARPA}} - t_{\mathrm{d}} = 84\ \text{days}. \tag{3}\]Equation 4, Phase 1 Funding of the Solicitation. The 15 million dollars for Phase 1A and the 60 million for Phase 1B make up the solicitation’s 75 million dollars for Phase 1. SPRINT questions and answers SPRINT broad agency announcement
\[15 + 60 = 75\ \text{million dollars}. \tag{4}\]Equation 5, Decomposition of Aurora’s Contract. Aurora’s obligations before the Phase 1B modification, at that modification and after it sum exactly to the contract total of 33,301,718 dollars. Award HR001124C0325 to Aurora Flight Sciences
\[4{,}843{,}311 + 12{,}974{,}331 + 15{,}484{,}076 = 33{,}301{,}718\ \text{dollars}. \tag{5}\]Equation 6, Recorded Phase 1A Obligations. Aurora’s pre-option obligations with the Piasecki and Northrop Grumman totals sum to 15,194,105 dollars, which exceeds the solicitation’s Phase 1A figure by 194,105 dollars. Award HR001124C0325 to Aurora Flight Sciences Award HR001124C0326 to Piasecki Aircraft Award HR001124C0327 to Northrop Grumman
\[4{,}843{,}311 + 4{,}944{,}700 + 5{,}406{,}094 = 15{,}194{,}105 = 15{,}000{,}000 + 194{,}105\ \text{dollars}, \tag{6}\]Equation 7, Bespoke Bound on Bell’s Instrument Under a Phase 1 Ceiling. If the solicitation’s 75 million dollars had held as a ceiling on Phase 1, a premise the Phase 1A overrun shows did not hold, Bell’s instrument could not have exceeded 31,347,488 dollars. Award HR001124C0325 to Aurora Flight Sciences
\[B_{\mathrm{Bell}} \le 75{,}000{,}000 - (33{,}301{,}718 + 4{,}944{,}700 + 5{,}406{,}094) = 31{,}347{,}488\ \text{dollars}. \tag{7}\]Equation 8, Bespoke Slip of First Flight. The solicitation’s goal of first flight 42 months after the award gives 1 May 2027, and taking the plan of early 2028 as 1 January 2028 makes the slip at least eight months. SPRINT broad agency announcement
\[t_{\mathrm{ff}}^{\mathrm{goal}} = t_{\mathrm{award}} + 42\ \text{months} = 1\ \text{May}\ 2027, \qquad t_{\mathrm{ff}}^{\mathrm{plan}} - t_{\mathrm{ff}}^{\mathrm{goal}} \ge 8\ \text{months}, \qquad t_{\mathrm{ff}}^{\mathrm{plan}} - t_{\mathrm{award}} \ge 50\ \text{months}, \tag{8}\]Equation 9, Intervals From Solicitation to Award and From Award to Allocation. The first award came 236 days after the solicitation was posted, and the designation was allocated 719 days after that award.
\[t_{\mathrm{award}} - t_{\mathrm{BAA}} = 236\ \text{days}, \qquad t_{\mathrm{a}} - t_{\mathrm{award}} = 719\ \text{days}. \tag{9}\]Equation 10, Budget Shortfall, Growth and Total. Fiscal year 2024 was executed 9.639 million dollars below its request, fiscal year 2025 rose 27.5 percent from request to actual, fiscal year 2026 fell 13.9 percent from its request to the latest book, and the latest figures for fiscal years 2024 to 2027 sum to 169.661 million dollars. DARPA budget justification, fiscal year 2024 DARPA budget justification, fiscal year 2025 DARPA budget justification, fiscal year 2026 DARPA budget justification, fiscal year 2027
\[22.663 - 13.024 = 9.639, \qquad \frac{47.000}{36.866} - 1 = 0.275, \qquad 1 - \frac{47.524}{55.200} = 0.139, \qquad 13.024 + 47.000 + 47.524 + 62.113 = 169.661. \tag{10}\]Equation 11, Troposphere of the Standard Atmosphere. Below 11 kilometres the temperature falls linearly with altitude, the pressure follows from the hydrostatic relation, the density from the equation of state and the speed of sound from the temperature. U.S. Standard Atmosphere 1976 1976
\[T = T_0 - \Lambda h, \qquad p = p_0 \left( \frac{T}{T_0} \right)^{g / (\Lambda R)}, \qquad \rho = \frac{p}{R T}, \qquad a = \sqrt{\gamma R T}. \tag{11}\]Equation 12, Hot-Day Increase in Induced Power. Induced power at fixed weight and disk area scales as the inverse square root of density, so the solicitation’s hover condition of 4,000 feet on a 95 degree Fahrenheit day costs 11.3 percent before any engine lapse. SPRINT proposers day slides U.S. Standard Atmosphere 1976 1976
\[\sqrt{\frac{\rho_0}{\rho_{\mathrm{hot}}}} = \sqrt{\frac{1.225}{0.9893}} = 1.113, \tag{12}\]Equation 13, Take-Off Power of the Family Against the Base Model. The take-off ratings of the other models in the certificated family lie between 0.982 and 1.069 times the base model’s 1,879 kilowatts. Type-certificate data sheet for the CT7 series
\[\frac{1845}{1879} = 0.982, \qquad \frac{2009}{1879} = 1.069. \tag{13}\]Equation 14, Installed Take-Off Power. Two turboshafts at the certificated take-off rating give 3,758 kilowatts. Type-certificate data sheet for the CT7 series
\[P = 2 \times 1879\ \text{kW} = 3758\ \text{kW} \tag{14}\]Equation 15, Hover Power With Figure of Merit, Drive Loss and Download. The shaft power to hover is the ideal induced power for a thrust raised by the wing download, divided by the rotor figure of merit and the drive efficiency and written in terms of disk loading.
\[P_h = \frac{W (1 + d)^{3/2}}{\mathrm{FM}\, \eta} \sqrt{\frac{w}{2 \rho}}. \tag{15}\]Equation 16, Heaviest Weight the Installed Power Can Hover. Setting the hover power equal to the installed power and solving for weight gives the heaviest aeroplane that can hover at a chosen disk loading.
\[W_{\max} = \frac{P\, \mathrm{FM}\, \eta}{(1 + d)^{3/2}} \sqrt{\frac{2 \rho}{w}}, \tag{16}\]Equation 17, Highest Disk Loading at Which a Weight Can Hover. Solving the hover power relation for disk loading at a given weight gives the highest disk loading at which that weight can still hover.
\[w_{\max} = 2 \rho \left( \frac{P\, \mathrm{FM}\, \eta}{W (1 + d)^{3/2}} \right)^{2}. \tag{17}\]Equation 18, Radius of Each of Two Equal Rotors. Each rotor’s radius follows from the total disk area, weight over disk loading, shared equally between two circular disks.
\[r = \sqrt{\frac{W}{2 \pi w}}. \tag{18}\]Equation 19, Bespoke Disk Loading Limit on the Hot Day. At the assumed figure of merit, drive efficiency and download, the sea-level limit of 55.6 pounds per square foot scales with the density ratio to 44.9 on the solicitation’s hot day.
\[w_{\max}^{\mathrm{hot}} = \sigma_{\mathrm{hot}}\, w_{\max} = 0.8076 \times 55.6\ \text{psf} = 44.9\ \text{psf}. \tag{19}\]Equation 20, Bespoke Hover Weight at the XV-15’s Disk Loading. At the assumed hover efficiencies and the XV-15’s published disk loading of 13.2 pounds per square foot, two turboshafts would hover about 30,800 pounds, twice the solicitation’s heaviest weight. The History of the XV-15 Tilt Rotor Research Aircraft
\[\frac{W_{\max}(w = 13.2\ \text{psf})}{15{,}000\ \text{lb}} = \frac{30{,}775}{15{,}000} = 2.05. \tag{20}\]Equation 21, Hot-Day Ratio of Hover Weights. At fixed power and disk loading the heaviest hover weight scales as the square root of density, so the hot day costs about 10 percent of hover weight before engine lapse.
\[\frac{W_{\max}(\rho_{\mathrm{hot}})}{W_{\max}(\rho_0)} = \sqrt{\frac{\rho_{\mathrm{hot}}}{\rho_0}} = \sqrt{0.8076} = 0.899, \tag{21}\]Equation 22, Induced Velocity at the Disk. Momentum theory gives the induced velocity at the disk in hover as the square root of the thrust per unit disk area, including the download, over twice the density.
\[v_h = \sqrt{\frac{(1 + d)\, w}{2 \rho}}, \tag{22}\]Equation 23, Dynamic Pressure of the Hover Wake. Because the fully developed wake moves at twice the induced velocity, its dynamic pressure equals the thrust per unit disk area at any altitude and on any day.
\[q_w = \tfrac{1}{2} \rho \left( 2 v_h \right)^2 = \tfrac{1}{2} \rho \cdot \frac{4 (1 + d)\, w}{2 \rho} = (1 + d)\, w. \tag{23}\]Equation 24, Bespoke Thrust Lapse of the Turbofan. For want of a published lapse, the article models the turbofan’s thrust as its sea-level static thrust times the density ratio times a Mach factor it sweeps from 0.5 to 0.7. Type-certificate data sheet for the PW308 series
\[F = F_0\, \sigma\, \varphi, \tag{24}\]Equation 25, Bespoke Largest Drag Area the Jet Can Push. Under the article’s lapse model the density ratio cancels, so the largest equivalent flat-plate drag area at a given true airspeed is the same at every altitude.
\[f_{\max} = \frac{F}{q} = \frac{F_0\, \sigma\, \varphi}{\tfrac{1}{2} \sigma \rho_0 V^2} = \frac{2 F_0\, \varphi}{\rho_0 V^2}. \tag{25}\]Equation 26, Bespoke Required Lift-to-Drag Ratio. With thrust equal to drag and lift equal to weight, the article’s lapse model gives the lift-to-drag ratio the aircraft must reach as weight over available thrust.
\[\left( \frac{L}{D} \right)_{\mathrm{req}} = \frac{W}{F} = \frac{W}{F_0\, \sigma\, \varphi}. \tag{26}\]Equation 27, Bespoke Lowest Density Ratio for Level Flight. Turning the required ratio around gives the lowest density ratio, and so the highest altitude, at which a given lift-to-drag ratio still allows level flight under the article’s lapse model.
\[\sigma_{\min} = \frac{W}{F_0\, \varphi\, E}, \tag{27}\]Equation 28, Bespoke Thrust Power of the Turbofan in Cruise. At 400 knots and 15,000 feet and a lapse factor of 0.6 taken at the middle of the assumed range, the turbofan’s thrust power is 2.42 megawatts.
\[P_F = F V = 31.13\ \text{kN} \times 0.6292 \times 0.6 \times 205.8\ \text{m/s} = 2.42\ \text{MW}, \tag{28}\]Equation 29, Bespoke Thrust Power Against Shaft Power. The turbofan’s cruise thrust power at the assumed lapse factor is 0.79 of the two turboshafts’ maximum continuous shaft power.
\[\frac{P_F}{P_{\mathrm{mcp}}} = \frac{2.42\ \text{MW}}{3.05\ \text{MW}} = 0.79. \tag{29}\]Equation 30, Helical Tip Mach Number. A proprotor tip in axial flight moves at the vector sum of its tip speed and the flight speed, so its helical tip Mach number is that resultant over the speed of sound. Dittmar and Hall 1991
\[M_h = \frac{\sqrt{V^2 + V_t^2}}{a}. \tag{30}\]Equation 31, Largest Tip Speed Under a Helical Tip Mach Limit. Holding the helical tip Mach number to a limit bounds the tip speed by the speed of sound times the square root of the limit squared less the flight Mach number squared.
\[V_t \le a \sqrt{M_{h,\max}^2 - M^2}, \tag{31}\]Equation 32, Airspeed at Which No Tip Speed Satisfies the Limit. When the flight speed equals the helical tip Mach limit times the speed of sound, no positive tip speed satisfies the limit.
\[V_{\mathrm{wall}} = M_{h,\max}\, a, \tag{32}\]Equation 33, Bespoke Allowed Tip Speed Fraction and Advance Ratio. The article expresses the allowed tip speed as a fraction of the XV-15’s airplane-mode tip speed under an assumed helical tip Mach limit of 0.85, together with the advance ratio that results. The History of the XV-15 Tilt Rotor Research Aircraft
\[\kappa = \frac{a \sqrt{M_{h,\max}^2 - M^2}}{V_t^{\mathrm{XV15}}}, \qquad \lambda = \frac{V}{\kappa\, V_t^{\mathrm{XV15}}}, \tag{33}\]Equation 34, Wing Stall Speed. The stall speed is the square root of twice the wing loading over the sea-level density times the maximum lift coefficient.
\[V_s = \sqrt{\frac{2\, (W/S)}{\rho_0\, C_{L}^{\max}}}, \tag{34}\]Equation 35, Bespoke Dry Mass of the Engines on the One-Turbofan Reading. Reading the register’s engine cell as one turbofan and two turboshafts, the certificated dry masses sum to 1,110.7 kilograms. Type-certificate data sheet for the CT7 series Type-certificate data sheet for the PW308 series
\[m_e = 2 \times 243.6 + 623.5 = 1110.7\ \text{kg}. \tag{35}\]Equation 36, Bespoke Engine Mass Fraction. On the one-turbofan reading the bare engines are 0.163 of gross mass at the solicitation’s 15,000 pounds and 0.306 at its 8,000 pounds.
\[\mu_e = \frac{m_e}{m_0} = \frac{1110.7\ \text{kg}}{6803.9\ \text{kg}} = 0.163 \quad \text{at 15,000 lb}, \qquad \frac{1110.7\ \text{kg}}{3628.7\ \text{kg}} = 0.306 \quad \text{at 8,000 lb}. \tag{36}\]Equation 37, Specific Power and Static Thrust-to-Weight Ratio. The turboshaft’s certificated take-off power over its dry mass is 7.7 kilowatts per kilogram, and the turbofan’s static thrust over its dry weight is 5.1. Type-certificate data sheet for the CT7 series Type-certificate data sheet for the PW308 series
\[\frac{1879\ \text{kW}}{243.6\ \text{kg}} = 7.7\ \text{kW/kg}, \qquad \frac{31.15\ \text{kN}}{623.5\ \text{kg} \times g} = 5.1, \tag{37}\]Equation 38, Turbofan Static Thrust Against Gross Weight. The turbofan’s sea-level static thrust is 0.47 of the weight at 15,000 pounds and 0.88 at 8,000 pounds, so it alone could not hover the aircraft.
\[\frac{F_0}{W} = \frac{31.15\ \text{kN}}{66.72\ \text{kN}} = 0.47 \quad \text{at 15,000 lb}, \qquad \frac{31.15\ \text{kN}}{35.59\ \text{kN}} = 0.88 \quad \text{at 8,000 lb}, \tag{38}\]Equation 39, Proprotor Speed and Speed Reduction. A proprotor of a given radius and tip speed turns at a rotational speed that, set against the turboshaft output speed, fixes the reduction the drive system must make. Type-certificate data sheet for the CT7 series
\[N_r = \frac{60\, V_t}{2 \pi r}, \qquad \mathcal{G} = \frac{N_e}{N_r} = \frac{2 \pi r\, N_e}{60\, V_t}. \tag{39}\]Equation 40, Bespoke Drag Ceiling With More Than One Turbofan. Under the article’s lapse model the drag ceiling scales with the number of turbofans, so a second turbofan would double the drag budget.
\[f_{\max} = \frac{2\, n_F\, F_0\, \varphi}{\rho_0 V^2}, \tag{40}\]Notation
- $W$, the gross weight
- $m_0$, the gross mass, with $W = m_0 g$
- $m_e$, the dry mass of the three engines together
- $\mu_e$, the engine mass fraction, $m_e / m_0$
- $P_h$, the shaft power required to hover out of ground effect, with $P$ the installed shaft power of the two turboshafts
- $P_{\mathrm{ideal}}$, the induced power of an ideal rotor system in hover
- $P_F$, the thrust power of the turbofan, $F V$
- $\mathrm{FM}$, the rotor figure of merit in hover, assumed 0.75
- $\eta$, the transmission and accessory efficiency in hover, assumed 0.90
- $d$, the wing download as a fraction of weight, assumed 0.10
- $A$, the total disk area of the two proprotors
- $w$, the disk loading, $W / A$
- $r$, the radius of one proprotor
- $v_h$, the induced velocity at the disk in hover
- $\rho_0$, the sea-level standard density, 1.225 kilograms per cubic metre, with $\rho$ the air density
- $\sigma$, the density ratio, $\rho / \rho_0$
- $T_0$, the sea-level standard temperature, 288.15 kelvin, with $T$ the air temperature
- $p_0$, the sea-level standard pressure, 101,325 pascals, with $p$ the air pressure
- $\Lambda$, the tropospheric temperature lapse rate, 0.0065 kelvin per metre
- $h$, the geopotential altitude
- $R$, the specific gas constant of air, 287.05 joules per kilogram kelvin
- $\gamma$, the ratio of specific heats of air, 1.4
- $a$, the speed of sound
- $F_0$, the turbofan sea-level static thrust at a stated rating, with $F$ its thrust at altitude and speed
- $\varphi$, the turbofan’s thrust lapse factor at cruise Mach number, swept 0.5 to 0.7
- $f_{\max}$, the largest equivalent flat-plate drag area the jet can push
- $V$, the true airspeed
- $M_h$, the helical tip Mach number of a proprotor in axial flight, with $M_{h,\max}$ its limit
- $V_t$, the proprotor tip speed
- $V_s$, the wing stall speed
- $C_{L}^{\max}$, the maximum lift coefficient, assumed 1.6
- $E$, the lift-to-drag ratio, $L / D$
- $q_w$, the dynamic pressure of the fully developed hover wake
- $\kappa$, the proprotor tip speed as a fraction of the XV-15’s airplane-mode tip speed
- $\lambda$, the proprotor advance ratio in axial flight
- $N_r$, the proprotor speed in revolutions per minute, with $N_e$ the turboshaft output speed
- $\mathcal{G}$, the speed reduction from turboshaft output to proprotor, $N_e / N_r$
- $n_F$, the number of turbofans fitted
- $t_{\mathrm{pub}}$, the row’s first public appearance, with $t_{\mathrm{a}}$ the allocation and $t_{\mathrm{d}}$ this article’s date
- $t_{\mathrm{ff}}$, first flight, as a goal or a plan, with $t_{\mathrm{award}}$ the first Phase 1A award and $t_{\mathrm{BAA}}$ the solicitation
- $B_{\mathrm{Bell}}$, the value of Bell’s Phase 1 instrument
References
Primary Sources, Peer-Reviewed
- Abdulhamitbilal, Erkan. 2016. “High-Order Sliding Mode Control of a Turboshaft Engine.” In 2016 14th International Workshop on Variable Structure Systems (VSS). IEEE. https://doi.org/10.1109/vss.2016.7506917
- Acree, C. W., Jr., and Mark B. Tischler. 1989a. “Identification of XV-15 Aeroelastic Modes Using Frequency Sweeps.” Journal of Aircraft 26. https://ntrs.nasa.gov/citations/19890054647
- Adelt, Wilfried H. 1983. “Type a V/STOL: One Aircraft for All Support Missions?” Journal of Aircraft 20 (6): 508–15. https://doi.org/10.2514/3.44901
- Adesh, A., and S. R. Arun. 2024. “Electric, Amphibious and VTOL Aircraft Design, a Forgotten Art: From Conceptual Design to Powerful Future Implementation.” In 2024 Third International Conference on Distributed Computing and Electrical Circuits and Electronics (ICDCECE). IEEE. https://doi.org/10.1109/icdcece60827.2024.10548810
- Adeyemi, Dami, Sam Bull, David Cleaver, and Jon du Bois. 2026. “Tiltrotor Whirl Flutter Mitigation through Active Mini-Tab Control.” Journal of Aircraft 63 (2): 823–37. https://doi.org/10.2514/1.c037836
- Afzal, Hassaan, and Fahad Mumtaz Malik. 2018. “Stabilization of Unmanned Helicopter with Suspended Payload in Presence of Wind Gusts and Rotor Downwash.” In 2018 5th International Conference on Electrical and Electronic Engineering (ICEEE). IEEE. https://doi.org/10.1109/iceee2.2018.8391326
- Ailon, Amit. 2009. “Control for Autonomous VTOL Aircraft with Restricted Inputs.” In 2009 17th Mediterranean Conference on Control and Automation. IEEE. https://doi.org/10.1109/med.2009.5164771
- Akinwale, Akinola, and Anubhav Datta. 2025b. “Understanding High-Speed Aeroelastic Stability of a Gimballed Proprotor.” Journal of Aircraft 62 (2): 313–27. https://doi.org/10.2514/1.c037994
- Amri, H., R. Feil, M. Hajek, and M. Weigand. 2016. “Possibilities and Difficulties for Rotorcraft Using Variable Transmission Drive Trains.” CEAS Aeronautical Journal 7 (2): 333–44. https://doi.org/10.1007/s13272-016-0191-6
- An, Zhengcai, and Shuyi Shao. 2023. “Resilient Switching Control of the Tilt-Rotor Aircraft Based on the Disturbance Observer.” In 2023 International Conference on Advanced Robotics and Mechatronics (ICARM). IEEE. https://doi.org/10.1109/icarm58088.2023.10218762
- Anderson, R. D., R. E. Devlin, A. S. Novick, and D. A. Wagner. 1985. “Advanced Single-Rotation Propfan Drive System.” Journal of Propulsion and Power 1 (4): 259–60. https://doi.org/10.2514/3.22790
- Apkarian, Jacob. 2018. “Attitude Control of Pitch-Decoupled VTOL Fixed Wing Tiltrotor.” In 2018 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas.2018.8453473
- Arace, Matthew, Anubhav Datta, and Michael Ricci. 2026. “Hybrid-Electric Rotorcraft Sizing with Detailed Engine Specific Fuel Consumption.” Journal of Aircraft 63 (2): 669–80. https://doi.org/10.2514/1.c038404
- Atkins, Ella M., and Min Xue. 2004. “Noise-Sensitive Final Approach Trajectory Optimization for Runway-Independent Aircraft.” Journal of Aerospace Computing, Information, and Communication 1 (7): 269–87. https://doi.org/10.2514/1.3924
- Autenrieb, Johannes, Hyo-Sang Shin, and Marko Bacic. 2019. “Development of a Neural Network-Based Adaptive Nonlinear Dynamic Inversion Controller for a Tilt-Wing VTOL Aircraft.” In 2019 Workshop on Research, Education and Development of Unmanned Aerial Systems (RED UAS). IEEE. https://doi.org/10.1109/reduas47371.2019.8999700
- Bagai, Ashish, and J. Gordon Leishman. 1995c. “Rotor Free-Wake Modeling Using a Pseudoimplicit Relaxation Algorithm.” Journal of Aircraft 32 (6): 1276–85. https://doi.org/10.2514/3.46875
- Bao, Weicheng, Weiqi Wang, Xi Chen, Hang Zhang, and Qijun Zhao. 2023. “Numerical Analyses of Aeroacoustic Characteristics of Tiltrotor Considering the Aerodynamic Interaction by the Fuselage in Hover.” Aerospace Science and Technology 141: 108558. https://doi.org/10.1016/j.ast.2023.108558
- Barla, C., E. Berton, D. Favier, and C. Maresca. 2006. “Embedded Laser Doppler Velocimetry Boundary-Layer Investigation on a Tilt-Rotor Blade.” Journal of Aircraft 43 (3): 584–91. https://doi.org/10.2514/1.15983
- Barra, Federico, Pierluigi Capone, and Giorgio Guglieri. 2020. “A Methodology for Preliminary Performance Estimation of a Hybrid-Electric Tilt-Wing Aircraft for Emergency Medical Services.” In 2020 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas48674.2020.9214025
- Bauersfeld, L., and G. Ducard. 2020. “Fused-PID Control for Tilt-Rotor VTOL Aircraft.” In 2020 28th Mediterranean Conference on Control and Automation (MED). IEEE. https://doi.org/10.1109/med48518.2020.9183031
- Bautista, Jose A., Antonio Osorio, and Rogelio Lozano. 2017. “Modeling and Analysis of a Tricopter/flying-Wing Convertible UAV with Tilt-Rotors.” In 2017 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas.2017.7991502
- Bazmi, Farshid, and Afshin Rahimi. 2023. “Off-Design Analysis Method for Compressor Fouling Fault Diagnosis of Helicopter Turboshaft Engine.” Modelling 4 (1): 56–69. https://doi.org/10.3390/modelling4010005
- Belák, Jan, and Martin Hromčík. 2023b. “Unified Attitude Control Strategy for Tilt-Rotor VTOL Aircraft.” In 2023 American Control Conference (ACC). IEEE. https://doi.org/10.23919/acc55779.2023.10156090
- Belardo, Marika, Aniello Daniele Marano, Jacopo Beretta, et al. 2021. “Wing Structure of the Next-Generation Civil Tiltrotor: From Concept to Preliminary Design.” Aerospace 8 (4): 102. https://doi.org/10.3390/aerospace8040102
- Benedict, Moble, Tejaswi Jarugumilli, and Inderjit Chopra. 2013. “Effect of Rotor Geometry and Blade Kinematics on Cycloidal Rotor Hover Performance.” Journal of Aircraft 50 (5): 1340–52. https://doi.org/10.2514/1.c031461
- Beretta, Jacopo, Andres Cardozo, Nicola Paletta, Antonio Chiariello, and Marika Belardo. 2024. “On the Fine-Tuning of the Stick-Beam Wing Dynamic Model of a Tiltrotor: A Case Study.” Aerospace 11 (2): 116. https://doi.org/10.3390/aerospace11020116
- Beser, Jacques. 1979. “Approach Guidance Logic for a Tilt-Rotor Aircraft.” Journal of Guidance and Control 2 (6): 528–35. https://doi.org/10.2514/3.55920
- Bevan, R. L. T., D. J. Poole, C. B. Allen, and T. C. S. Rendall. 2017. “Adaptive Surrogate-Based Optimization of Vortex Generators for Tiltrotor Geometry.” Journal of Aircraft 54 (3): 1011–24. https://doi.org/10.2514/1.c033838
- Bevilaqua, Paul, Richard Margason, and Charles Gaharan. 2010. “Jet Entrainment Theory for Vertical Takeoff and Landing Aircraft Suckdown.” AIAA Journal 48 (2): 330–39. https://doi.org/10.2514/1.43258
- Bhagwat, Mahendra J., Francis X. Caradonna, and Manikandan Ramasamy. 2015. “Wing–vortex Interaction: Unraveling the Flowfield of a Hovering Rotor.” Experiments in Fluids 56 (1): 19. https://doi.org/10.1007/s00348-014-1893-3
- Bilger, J. M., R. L. Marr, and Ahmad Zahedi. 1982a. “In-Flight Structural Dynamic Characteristics of the XV-15 Tilt-Rotorresearch Aircraft.” Journal of Aircraft 19 (11): 1005–11. https://doi.org/10.2514/3.44804
- Blacodon, D., and S. Lewy. 1992. “Spinning Mode Analysis of the Acoustic Field Generated by a Turboshaft Engine.” Journal of Aircraft 29 (6): 1073–79. https://doi.org/10.2514/3.46287
- Blandeau, Vincent P., and Phillip F. Joseph. 2010. “Broadband Noise Due to Rotor-Wake/Rotor Interaction in Contra-Rotating Open Rotors.” AIAA Journal 48 (11): 2674–86. https://doi.org/10.2514/1.j050566
- Böhnisch, Nils, Carsten Braun, Vincenzo Muscarello, and Pier Marzocca. 2024. “About the Wing and Whirl Flutter of a Slender Wing–Propeller System.” Journal of Aircraft 61 (4): 1117–30. https://doi.org/10.2514/1.c037542
- Böhnisch, Nils, Paul Kantzidis, Pierangelo Masarati, and Vincenzo Muscarello. 2025. “Assessment of Aerodynamic Torque on Propeller Whirl Flutter and Its Control.” Journal of Aircraft 62 (6): 1490–1503. https://doi.org/10.2514/1.c038128
- Bohorquez, Felipe, Darryll Pines, and Paul D. Samuel. 2010. “Small Rotor Design Optimization Using Blade Element Momentum Theory and Hover Tests.” Journal of Aircraft 47 (1): 268–83. https://doi.org/10.2514/1.45301
- Boulkeraa, Tayeb, Adel Ghenaiet, and Ernesto Benini. 2022. “Optimum Operating Parameters and Blade Setting of a High-Speed Propeller.” Journal of Aircraft 59 (2): 484–501. https://doi.org/10.2514/1.c035861
- Bousquet, J.-M., and P. Gardarein. 2003. “Improvements on Computations of High Speed Propeller Unsteady Aerodynamics.” Aerospace Science and Technology 7 (6): 465–72. https://doi.org/10.1016/s1270-9638(03)00046-4
- Brown, E. L., and J. N. Fisher. 1968. “Comparative Projections of Low-Disk-Loading VTOL Aircraft for Civil Applications.” Journal of Aircraft 5 (5): 436–42. https://doi.org/10.2514/3.43963
- Burton, Samantha, Tianyi He, and Weihua Su. 2023. “Trajectory Planning and LPV Model Predictive Control of Tilt-Rotor VTOL Aircraft.” In 2023 American Control Conference (ACC). IEEE. https://doi.org/10.23919/acc55779.2023.10155861
- Burton, Samantha, Tianyi He, and Weihua Su. 2024. “Physics-Data-Hybrid Modeling of Tilt-Rotor Vertical Take-Off and Landing Aircraft.” In 2024 American Control Conference (ACC). IEEE. https://doi.org/10.23919/acc60939.2024.10644934
- Calise, Anthony J., and Friedrich Kramer. 1982. “A Variable Structure Approach to Robust Control of VTOL Aircraft.” In 1982 American Control Conference. IEEE. https://doi.org/10.23919/acc.1982.4788017
- Campbell, John P. 1960. “Vertical-Takeoff Aircraft.” Scientific American 203 (2): 41–49. https://doi.org/10.1038/scientificamerican0860-41
- Campbell, D. R., and B. Quinn. 1974. “Test Results of a VTOL Propulsion Concept Utilizing aTurbofan Powered Augmentor.” Journal of Aircraft 11 (8): 467–71. https://doi.org/10.2514/3.60369
- Cao, Fei, Ming Chen, and Liang Li. 2017a. “A Compound Helicopter Flight Power Calculation Method with Power Loss Model of Transmission System.” In 2017 8th International Conference on Mechanical and Aerospace Engineering (ICMAE). IEEE. https://doi.org/10.1109/icmae.2017.8038705
- Cao, Yihua, Qi Qi, and Dongfang Zhang. 2017b. “Flight Dynamic Characteristics of Tiltrotor Aircraft Slung-Load System.” Journal of Aircraft 54 (3): 1221–28. https://doi.org/10.2514/1.c033937
- Cao, Yihua, Gaozhan Wang, and Chongwen Jiang. 2021. “Study on Influencing Factors of Helicopter Brownout Evolution Based on CFD-DEM.” Applied Sciences 12 (1): 126. https://doi.org/10.3390/app12010126
- Cao, Yan, Yin Wang, Hongyi Song, Qiang Li, and Hui Zhang. 2018. “The Unidirectional Auxiliary Surface Sliding Mode Control for Compound High-Speed Helicopter.” In 2018 IEEE CSAA Guidance, Navigation and Control Conference (CGNCC). IEEE. https://doi.org/10.1109/gncc42960.2018.9018921
- Carico, D. n.d. “Tiltrotor Analytic Flight Test and Training Support.” In Proceedings, IEEE Aerospace Conference, vol. 5. IEEE. https://doi.org/10.1109/aero.2002.1035428
- Carico, D. 2003. “Modeling the Tiltrotor Shipboard Flight Test Environment.” In 2003 IEEE Aerospace Conference Proceedings (Cat. No.03TH8652), vol. 6. IEEE. https://doi.org/10.1109/aero.2003.1235199
- Carlockmber, G., and A. Sageior. 1975. “VTOL Flight-Control System Design Using Sensitivity Analysis.” IEEE Transactions on Aerospace and Electronic Systems AES-11 (2): 155–61. https://doi.org/10.1109/taes.1975.308052
- Carlson, Stephen J., and Christos Papachristos. 2021. “The MiniHawk-VTOL: Design, Modeling, and Experiments of a Rapidly-Prototyped Tiltrotor UAV.” In 2021 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas51884.2021.9476731
- Carlson, Stephen J., and Christos Papachristos. 2024. “Hybrid Locomotive Behaviors for an Amphibious Fixed-Wing / VTOL Tiltrotor UAV.” In 2024 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas60882.2024.10557085
- Carlson, Eric B., and Yiyuan J. Zhao. 2002. “Optimal Short Takeoff of Tiltrotor Aircraft in One Engine Failure.” Journal of Aircraft 39 (2): 280–89. https://doi.org/10.2514/2.2925
- Carlson, Eric B., and Yiyuan J. Zhao. 2003. “Prediction of Tiltrotor Height-Velocity Diagrams Using Optimal Control Theory.” Journal of Aircraft 40 (5): 896–905. https://doi.org/10.2514/2.6865
- Castiglione, Teresa, Diego Perrone, Luciano Strafella, Antonio Ficarella, and Sergio Bova. 2023. “Linear Model of a Turboshaft Aero-Engine Including Components Degradation for Control-Oriented Applications.” Energies 16 (6): 2634. https://doi.org/10.3390/en16062634
- Catană, Răzvan Marius, Gabriel Dediu, and Cornel Mihai Tărăbîc. 2022. “Studies and Experimental Research in the Evaluation of TV2-117A Turboshaft Engine Working Regimes.” Applied Sciences 12 (7): 3703. https://doi.org/10.3390/app12073703
- Cecrdle, J. 2012. “Analysis of Twin Turboprop Aircraft Whirl-Flutter Stability Boundaries.” Journal of Aircraft 49 (6): 1718–25. https://doi.org/10.2514/1.c031390
- Cetinsoy, Ertugrul. 2015. “Design and Control of a Gas-Electric Hybrid Quad Tilt-Rotor UAV with Morphing Wing.” In 2015 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas.2015.7152278
- Chakraborty, Imon, and Aashutosh Aman Mishra. 2023. “Sizing of Tilt-Wing Aircraft with All-Electric and Hybrid-Electric Propulsion.” Journal of Aircraft 60 (1): 245–64. https://doi.org/10.2514/1.c036813
- Chandrasekaran, Ruthvik, and Dewey H. Hodges. 2023. “Load Reduction during Resonance Crossing of a Variable-Speed Rotor.” Journal of Aircraft 60 (1): 97–119. https://doi.org/10.2514/1.c036873
- Chauhan, Shamsheer S., and Joaquim R. R. A. Martins. 2020. “Tilt-Wing eVTOL Takeoff Trajectory Optimization.” Journal of Aircraft 57 (1): 93–112. https://doi.org/10.2514/1.c035476
- Chen, Hao. 2019b. “Numerical Calculations on the Unsteady Aerodynamic Force of the Tilt-Rotor Aircraft in Conversion Mode.” International Journal of Aerospace Engineering 2019: 1–15. https://doi.org/10.1155/2019/2147068
- Chen, Hao. 2026. “Numerical Investigation on Aerodynamic Characteristics of a Tiltrotor Wing with Serrated Gurney Flap.” Scientific Reports 16 (1): 28443. https://doi.org/10.1038/s41598-026-59369-y
- Chen, Hao, and Bo Chen. 2022. “Lift Enhancement of Tiltrotor Wing Using a Gurney Flap.” International Journal of Aerospace Engineering 2022: 1–9. https://doi.org/10.1155/2022/1245484
- Chen, Hao, Siliang Du, and Zhong Chen. 2023. “Lift Augmentation on a Tiltrotor Wing Using the Combination of Vortex Generators and Gurney’s Flap.” International Journal of Aerospace Engineering 2023: 1–9. https://doi.org/10.1155/2023/6646817
- Chen, Yifeng, Yingqing Guo, and Ruichao Li. 2018. “State Feedback Control for Partially Distributed Turboshaft Engine with Time Delay and Packet Dropouts.” In 2018 37th Chinese Control Conference (CCC). IEEE. https://doi.org/10.23919/chicc.2018.8484255
- Chen, Mingtai, and James P. Hubner. 2021a. “Experimental Investigation of Wing-on-Rotor Effect at Low Disk Loading and Reynolds Number.” Journal of Aircraft 58 (3): 487–96. https://doi.org/10.2514/1.c035763
- Chen, Gang, Dongli Ma, Yuhong Jia, Xinglu Xia, and Cheng He. 2020. “Comprehensive Optimization of the Unmanned Tilt-Wing Cargo Aircraft with Distributed Propulsors.” IEEE Access 8: 137867–83. https://doi.org/10.1109/access.2020.3012481
- Chen, Gang, Dongli Ma, Yuhong Jia, Xinglu Xia, and Cheng He. 2021. “Comprehensive Sizing and Optimization Method for Series-Hybrid Unmanned Convertiplane.” Chinese Journal of Aeronautics 34 (4): 387–402. https://doi.org/10.1016/j.cja.2020.07.016
- Chen, Si, Lihua Yuan, Jiawei Xiang, et al. 2025b. “Self-Locking Stability Effect Induced by Downwash Flow of the Flapping Wing Rotor.” Journal of Bionic Engineering 22 (5): 2429–43. https://doi.org/10.1007/s42235-025-00746-0
- Cheng, Zeyu, Zhi Cao, John T. Hwang, and Chris Mi. 2025c. “Weight Minimization of Electric Vertical Takeoff and Landing Aircraft: From the Comprehensive Powertrain Perspective.” International Journal of Electrical Power & Energy Systems 172: 111328. https://doi.org/10.1016/j.ijepes.2025.111328
- Cheng, Zeyu, Zhi Cao, Chris Mi, and John T. Hwang. 2025a. “Cost Optimization of Electric Vertical Takeoff and Landing Aircraft through Powertrain Modeling.” Journal of Air Transportation 33 (3): 285–96. https://doi.org/10.2514/1.d0487
- Cheng, Xiaomei, Yingxun Wang, Jiang Zhao, Ningjun Liu, and Zhihao Cai. 2026. “Data-Driven Adaptive Hybrid-Based Control for Some Tiltrotor UAVs in the Low-Speed Flight.” Aerospace Science and Technology 170: 111513. https://doi.org/10.1016/j.ast.2025.111513
- Cheng, Xiaomei, Jiesong Yang, Bo Shao, and Yingxun Wang. 2025b. “Flight Control of Tiltrotor Uavs: Pso-Optimized Neural Network Aerodynamic Modeling with Esobased Disturbance Compensation.” In 2025 9th International Conference on Robotics and Automation Sciences (ICRAS). IEEE. https://doi.org/10.1109/icras65818.2025.11108809
- Chi, Cheng, Xufei Yan, Renliang Chen, and Pan Li. 2019. “Analysis of Low-Speed Height-Velocity Diagram of a Variable-Speed-Rotor Helicopter in One-Engine-Failure.” Aerospace Science and Technology 91: 310–20. https://doi.org/10.1016/j.ast.2019.05.003
- Chiappinelli, Romain, Mitchell Cohen, Martin Doff-Sotta, Meyer Nahon, James R. Forbes, and Jacob Apkarian. 2019. “Modeling and Control of a Passively-Coupled Tilt-Rotor Vertical Takeoff and Landing Aircraft.” In 2019 International Conference on Robotics and Automation (ICRA). IEEE. https://doi.org/10.1109/icra.2019.8793606
- Chiariello, Antonio, Salvatore Orlando, Pasquale Vitale, Mauro Linari, Raffaele Longobardi, and Luigi Di Palma. 2020. “Development of a Morphing Landing Gear Composite Door for High Speed Compound Rotorcraft.” Aerospace 7 (7): 88. https://doi.org/10.3390/aerospace7070088
- Chin Gian Hooi, Francis D. Lagor, and Derek A. Paley. 2015. “Flow Sensing, Estimation and Control for Rotorcraft in Ground Effect.” In 2015 IEEE Aerospace Conference. IEEE. https://doi.org/10.1109/aero.2015.7119297
- Choi, HaRyun, Byron YooHo Chang, Yeongmin Jo, and SangJoon Shin. 2026. “Rotor Sizing Effects on a Tiltwing Electric Vertical Takeoff and Landing Vehicle.” Journal of Aircraft: 1–15. https://doi.org/10.2514/1.c038503
- Choi, Seongwook, Youngshin Kang, Sungho Chang, Samok Koo, and Jai Moo Kim. 2010. “Development and Conversion Flight Test of a Small Tiltrotor Unmanned Aerial Vehicle.” Journal of Aircraft 47 (2): 730–32. https://doi.org/10.2514/1.46180
- Choi, Seong Wook, and Jai Moo Kim. 2010. “Investigation into the Aerodynamic Performance of the Tiltrotor Unmanned Aerial Vehicle Proprotor.” Journal of Aircraft 47 (3): 1083–86. https://doi.org/10.2514/1.47533
- Cioc, Carmen, Sorin Cioc, Laurentiu Moraru, Ahmet Kahraman, and Theo G. Keith. 2002. “A Deterministic Elastohydrodynamic Lubrication Model of High-Speed Rotorcraft Transmission Components.” Tribology Transactions 45 (4): 556–62. https://doi.org/10.1080/10402000208982587
- Clark, John W. 1982. “Recent Developments in Navy V/STOL Flying Qualities Criteria.” Journal of Aircraft 19 (2): 132–37. https://doi.org/10.2514/3.57365
- Cocco, Alessandro, Stefano Mazzetti, Pierangelo Masarati, Stefan van’t Hoff, and Bart Timmerman. 2022. “Numerical Whirl–Flutter Analysis of a Tiltrotor Semi-Span Wind Tunnel Model.” CEAS Aeronautical Journal 13 (4): 923–38. https://doi.org/10.1007/s13272-022-00605-2
- Colella, M. Molica, G. Bernadini, and M. Gennaretti. 2012. “Tiltrotor Wing-Root Vibratory Loads Reduction through Higher Harmonic Control Actuation.” Journal of Aircraft 49 (6): 1813–20. https://doi.org/10.2514/1.c031639
- Comer, Anthony, Imon Chakraborty, Stefanus Harris Putra, Rajan Bhandari, Bikash Kunwar, and Benjamin Davis. 2026b. “Flight Testing a Trajectory Control System on a Subscale Transitioning VTOL Aircraft.” Journal of Guidance, Control, and Dynamics 49 (2): 459–78. https://doi.org/10.2514/1.g009060
- “Convertiplane Described.” 1959. Journal of the Franklin Institute 268 (2): 136–37. https://doi.org/10.1016/0016-0032(59)90479-x
- Corliss, Lloyd, Richard K. Greif, and Ronald M. Gerdes. 1978. “Comparison of Ground-Based and in-Flight Simulation of VTOL Hover Control Concepts.” Journal of Guidance and Control 1 (3): 217–21. https://doi.org/10.2514/3.55766
- Costandin, Beniamin, Marius Costandin, and Petru Dobra. 2021. “A Novel Passively Coupled VTOL Aircraft for Arbitrary Flying Attitude.” Mechanics Based Design of Structures and Machines 51 (10): 5767–89. https://doi.org/10.1080/15397734.2021.2011745
- Critchfield, Tyler, and Andrew Ning. 2026. “Mission-Focused Multidisciplinary Design Optimization of Tilt-Rotor eVTOL Propulsion System.” Journal of Aircraft 63 (4): 1563–78. https://doi.org/10.2514/1.c038445
- Crossley, William A., and John W. Rutherford. 1995. “Sizing Methodology for Reaction-Driven, Stopped-Rotor Vertical Takeoff and Landing Concepts.” Journal of Aircraft 32 (6): 1367–74. https://doi.org/10.2514/3.46887
- Curtiss, H. C. 1970. “Dynamic Stability of V/STOL Aircraft at Low Speeds.” Journal of Aircraft 7 (1): 72–78. https://doi.org/10.2514/3.44124
- Curtiss, H. C. 1971. “Comment on ‘Minimum Control Power for VTOL Aircraft Stability Augmentation’.” Journal of Aircraft 8 (4): 0288a-0288a. https://doi.org/10.2514/3.59098
- Curtiss, H. C. 1973. “Complex Coordinates in near Hovering Rotor Dynamics.” Journal of Aircraft 10 (5): 289–96. https://doi.org/10.2514/3.60228
- de Gaudemaris, Vincent, Jean-Sébastien Schotté, Antoine Placzek, Laurent Blanc, and Fabrice Thouverez. 2025. “Influence of Blade Bending and Torsion on Propeller Whirl Flutter.” AIAA Journal 63 (11): 4782–97. https://doi.org/10.2514/1.j064944
- De Melo, Jorge, and Sahjendra Singh. 1984. “VTOL Aircraft Control Output Tracking Sensitivity Design.” IEEE Transactions on Aerospace and Electronic Systems AES-20 (2): 82–93. https://doi.org/10.1109/taes.1984.310430
- De Vita, Paolo, Gianni Cassoni, Marco Morandini, et al. 2026. “Numerical Interpretation of Whirl Flutter in a Tiltrotor Wind-Tunnel Model Using Mid-Fidelity Aerodynamics and Mechanical Friction.” CEAS Aeronautical Journal. https://doi.org/10.1007/s13272-026-00966-y
- Deckert, Wallace H., and David H. Hickey. 1970. “Summary and Analysis of Feasibility-Study Designs of V/STOL Transport Aircraft.” Journal of Aircraft 7 (1): 66–72. https://doi.org/10.2514/3.44123
- Delgado, Xavier M., Anubhav Datta, and Seyhan Gul. 2026. “Understanding High-Speed Aeroelastic Stability of Swept-Tip Tiltrotor Blades.” Journal of Aircraft 63 (5): 2521–33. https://doi.org/10.2514/1.c038396
- Deneke, Joseph A., and Darius J. Carter. 2026. “Tandem Rotor Wake Aerodynamics in Lateral Crossflow Wind Shear.” Journal of Aircraft: 1–15. https://doi.org/10.2514/1.c038488
- Deng, Xiongfeng, Binzi Xu, and Liang Tao. 2023. “Predefined Performance Tracking Control Design for a VTOL Aircraft System.” In 2023 5th International Conference on Robotics, Intelligent Control and Artificial Intelligence (RICAI). IEEE. https://doi.org/10.1109/ricai60863.2023.10489082
- Di Francesco, Gabriele, and Massimiliano Mattei. 2016. “Modeling and Incremental Nonlinear Dynamic Inversion Control of a Novel Unmanned Tiltrotor.” Journal of Aircraft 53 (1): 73–86. https://doi.org/10.2514/1.c033183
- Dibble, Robert, Vaclav Ondra, and Branislav Titurus. 2019b. “Resonance Avoidance for Variable Speed Rotor Blades Using an Applied Compressive Load.” Aerospace Science and Technology 88: 222–32. https://doi.org/10.1016/j.ast.2019.03.009
- Doff-Sotta, Martin, Mark Cannon, and Marko Bacic. 2025. “Data-Driven Robust Model Predictive Control of Tiltwing Vertical Takeoff and Landing Aircraft.” Journal of Guidance, Control, and Dynamics 48 (1): 203–11. https://doi.org/10.2514/1.g008315
- Dong, Linghua, and Qiyu Li. 2022. “Whirl Flutter Suppression of Tiltrotor Aircraft Using Actively Controlled Aileron.” Aerospace 9 (12): 795. https://doi.org/10.3390/aerospace9120795
- Dong, Jiuxiang, Boyang Zhang, and Yue Xin. 2014. “Static Output Feedback Control Synthesis for Canard Rotor/Wing Aircraft.” In Proceeding of the 11th World Congress on Intelligent Control and Automation. IEEE. https://doi.org/10.1109/wcica.2014.7053073
- dos Santos, João P. T. P., Gabriel P. Araujo, and Flávio D. Marques. 2026. “Nonlinear Energy Sink for Passive Mitigation of Propeller Whirl Flutter.” Aerospace Science and Technology 176: 112656. https://doi.org/10.1016/j.ast.2026.112656
- Dousis, D. A. n.d. “V-22 Tiltrotor Aircraft Vibration Monitoring from Design to Field Operations.” In Proceedings, IEEE Aerospace Conference, vol. 6. IEEE. https://doi.org/10.1109/aero.2002.1036147
- Dousis, D. A. 2000. “Design and Implementation of the V-22 Tiltrotor Aircuaft Vibration Monitoring and Diagnostic System.” In 2000 IEEE Aerospace Conference. Proceedings (Cat. No.00TH8484), vol. 6. IEEE. https://doi.org/10.1109/aero.2000.877901
- Droandi, G., G. Gibertini, D. Grassi, G. Campanardi, and C. Liprino. 2016. “Proprotor–wing Aerodynamic Interaction in the First Stages of Conversion from Helicopter to Aeroplane Mode.” Aerospace Science and Technology 58: 116–33. https://doi.org/10.1016/j.ast.2016.08.013
- Du, Siliang, and Yi Zha. 2024. “Numerical Simulation of the Transition Flight Aerodynamics of Cross-Shaped Quad-Tiltrotor UAV.” Scientific Reports 14 (1): 17878. https://doi.org/10.1038/s41598-024-68927-1
- Dunn, Mark H., and F. Farassat. 1992. “High-Speed Propeller Noise Prediction: A Multidisciplinary Approach.” AIAA Journal 30 (7): 1716–23. https://doi.org/10.2514/3.11128
- Durbin, Enoch, and Tad McGeer. 1982. “An Airspeed Vector Sensor for V/STOL Aircraft.” Journal of Aircraft 19 (6): 449–55. https://doi.org/10.2514/3.57415
- Edenborough, H. Kipling. 1968. “Investigation of Tilt-Rotor VTOL Aircraft Rotorpylon Stability.” Journal of Aircraft 5 (2): 97–105. https://doi.org/10.2514/3.43915
- Elena, Karpovich. 2026. “Scaling a Technology Demonstrator of an Electric Vertical Take-off and Landing Boxwing Martian Aircraft for Low-Altitude Flight Tests on Earth.” Aerospace Systems. https://doi.org/10.1007/s42401-026-00535-5
- Englar, Robert J., Rodney A. Hemmerly, W. Horace Moore, Vladimir Seredinsky, Walter Valckenaere, and John A. Jackson. 1981. “Design of the Circulation Control Wing STOL Demonstrator Aircraft.” Journal of Aircraft 18 (1): 51–58. https://doi.org/10.2514/3.57463
- Erhard, Racheal M., Juan J. Alonso, and Michael A. Cunningham. 2025. “Multifidelity Rotor Wake Modeling with Uncertainty Quantification of Transitioning Tilt-Propeller Aircraft Performance.” Journal of Aircraft 62 (2): 242–53. https://doi.org/10.2514/1.c037718
- Fan, Minglong, Lei Wang, Yi Sun, Jinwu Xiang, and Haiting Xia. 2025. “Aerodynamic Interference of Lift Surfaces during Transition Phase for VTOL Fixed-Wing UAVs with Canard Configuration.” Aerospace 12 (9): 784. https://doi.org/10.3390/aerospace12090784
- Fang, Xiaoxing, Qing Lin, Yingxun Wang, and Lili Zheng. 2012. “Control Strategy Design for the Transitional Mode of Tiltrotor UAV.” In IEEE 10th International Conference on Industrial Informatics. IEEE. https://doi.org/10.1109/indin.2012.6300840
- Farassat, F., and K. S. Brentner. 1998. “Supersonic Quadrupole Noise Theory for High-Speed Helicopter Rotors.” Journal of Sound and Vibration 218 (3): 481–500. https://doi.org/10.1006/jsvi.1998.1836
- Farassat, F., S. L. Padula, and M. H. Dunn. 1987. “Advanced Turboprop Noise Prediction Based on Recent Theoretical Results.” Journal of Sound and Vibration 119 (1): 53–79. https://doi.org/10.1016/0022-460x(87)90189-1
- Fatima, Kehkashan, Amir Hussain Idrisi, and Abdel-Hamid Ismail Mourad. 2020. “LabView Based Conrol System Design for VTOL Aircraft System.” In 2020 Advances in Science and Engineering Technology International Conferences (ASET). IEEE. https://doi.org/10.1109/aset48392.2020.9118372
- Fejtek, Ian, and Leonard Roberts. 1992b. “Navier-Stokes Computation of Wing/rotor Interaction for a Tilt Rotor in Hover.” AIAA Journal 30 (11): 2595–2603. https://doi.org/10.2514/3.11272
- Fenaughty, Ronald R., and Edward A. Beno. 1969. “Airload, Blade Response, and Hub Force Measurements on the NH-3A Compound Helicopter.” Journal of Aircraft 6 (5): 386–91. https://doi.org/10.2514/3.44075
- Feng, Hang, Shangyu Li, Kaicheng Li, and Junquan Chen. 2025. “Addressing Calibration Challenges for Large-Stroke Blade Pitch Control in Tiltrotor Aircraft via an Improved Cubic Polynomial Fitting Algorithm.” Aerospace 12 (9): 843. https://doi.org/10.3390/aerospace12090843
- Ferguson, Kevin, and Douglas Thomson. 2015a. “Flight Dynamics Investigation of Compound Helicopter Configurations.” Journal of Aircraft 52 (1): 156–67. https://doi.org/10.2514/1.c032657
- Ferrarese, Gastone, Fabrizio Giulietti, and Giulio Avanzini. 2013. “Modeling and Simulation of a Quad-Tilt Rotor Aircraft.” IFAC Proceedings Volumes 46 (30): 64–70. https://doi.org/10.3182/20131120-3-fr-4045.00037
- Fletcher, Timothy M., and Richard E. Brown. 2010. “Helicopter Tail Rotor Thrust and Main Rotor Wake Coupling in Crosswind Flight.” Journal of Aircraft 47 (6): 2136–48. https://doi.org/10.2514/1.c031018
- Flores, Gerardo, Israel Lugo, and Rogelio Lozano. 2014. “6-DOF Hovering Controller Design of the Quad Tiltrotor Aircraft: Simulations and Experiments.” In 53rd IEEE Conference on Decision and Control. IEEE. https://doi.org/10.1109/cdc.2014.7040348
- Fu, Yifang, Ban Wang, Huimin Zhao, Mengqi Zhou, Ni Li, and Zhenghong Gao. 2025a. “Adaptive Safety Attitude Control of a Hybrid VTOL UAV under Transition Flight Subject to Multiple Faults and Uncertainties.” Aerospace Science and Technology 163: 110284. https://doi.org/10.1016/j.ast.2025.110284
- Fu, Yifang, Ban Wang, Mengqi Zhou, Huimin Zhao, and Ni Li. 2025b. “Resilient Control Strategy for a VTOL UAV Achieving Safe Transition Flight under Actuator Faults and Disturbances.” In 2025 IEEE 19th International Conference on Control & Automation (ICCA). IEEE. https://doi.org/10.1109/icca65672.2025.11129771
- Gai, Wendong, Jing Zhang, Liangsong Huang, and Yuxia Li. 2014. “Transition Flight Control Using Adaptive Neutral Network Dynamic Inversion for Canard Rotor/Wing UAV.” In The 26th Chinese Control and Decision Conference (2014 CCDC). IEEE. https://doi.org/10.1109/ccdc.2014.6852919
- Gainutdinov, Vladimir, and Tatyana Gainutdinova. 2025. “Dynamic Model of a Composite Sectional Structure of Convertiplane with Two Tilting Rotors.” In Mathematical Modeling and Supercomputer Technologies. Springer Nature Switzerland. https://doi.org/10.1007/978-3-031-80457-1_18
- Gali, Sai Vishal, Todd G. Goehmann, and Cristina Riso. 2023a. “Fundamental Investigation into Output-Based Prediction of Whirl Flutter Bifurcations.” Journal of Fluids and Structures 123: 103986. https://doi.org/10.1016/j.jfluidstructs.2023.103986
- Gallagher, J. T., and F. B. O’Donnell. 1965. “Investigation of the Application of Direct Translational Control to VTOL Aircraft.” Journal of Aircraft 2 (6): 538–45. https://doi.org/10.2514/3.43694
- Ganguli, Ranjan. 2004. “A Survey of Recent Developments in Rotorcraft Design Optimization.” Journal of Aircraft 41 (3): 493–510. https://doi.org/10.2514/1.58
- Gao, Honggang, Zhenghong Gao, Yang Na, and Chao Pang. 2019b. “Trim Strategy, Control Model, and Flight Dynamics Characteristics of Canard Rotor/Wing Aircraft in Transition Mode.” IEEE Access 7: 66042–54. https://doi.org/10.1109/access.2019.2917316
- Gao, Honggang, Ao He, Zhenghong Gao, Yang Na, and Yangping Deng. 2019a. “Flight Dynamics Characteristics of Canard Rotor/wing Aircraft in Helicopter Flight Mode.” Chinese Journal of Aeronautics 32 (7): 1577–87. https://doi.org/10.1016/j.cja.2019.04.002
- Gao, Honggang, Zhenbao Liu, Ban Wang, and Chao Pang. 2020. “Flight Dynamics and Control of a New VTOL Aircraft in Fixed-Wing Mode.” In 2020 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas48674.2020.9213836
- Gao, Shang, Zhaonan Zuo, and Gang Wang. 2025b. “Research on Controlling Strategy of Autonomous VTOL and Transition Flight for Tiltrotor UAVs.” In 2025 5th International Conference on Mechatronics Technology and Aerospace Engineering (ICMTAE). IEEE. https://doi.org/10.1109/icmtae66890.2025.11427869
- Gennaretti, Massimo, Marco Molica Colella, and Giovanni Bernardini. 2010. “Prediction of Tiltrotor Vibratory Loads with Inclusion of Wing-Proprotor Aerodynamic Interaction.” Journal of Aircraft 47 (1): 71–79. https://doi.org/10.2514/1.41825
- Gibs, J., W. Z. Stepniewski, and R. Spencer. 1976. “Effects of Noise Reduction on Characteristics of a Tilt-Rotor Aircraft.” Journal of Aircraft 13 (11): 919–25. https://doi.org/10.2514/3.58730
- Gilbert, Michael G., and Walter A. Silva. 1989. “Aeroelastic Deformation Effects on the Stopped-Rotor Dynamics of an X-Wing Aircraft.” Journal of Aircraft 26 (5): 482–88. https://doi.org/10.2514/3.45789
- Glasgow, E. R., W. E. Beck, and R. R. Woollett. 1983. “Zero-Length Inlets for Subsonic V/STOL Aircraft.” Journal of Aircraft 20 (5): 397–403. https://doi.org/10.2514/3.44884
- Glasgow, E. R., and R. E. Skarshaug. 1980. “Type a V/STOL Propulsion System Development.” Journal of Aircraft 17 (10): 741–47. https://doi.org/10.2514/3.57961
- Goodman, Theodore R., and August F. Lehman. 1971. “Advantage of Testing Aircraft Rotor Models with Sharply Deflected Wakes in Water.” Journal of Aircraft 8 (7): 585–86. https://doi.org/10.2514/3.44286
- Govindarajan, B. M., and J. G. Leishman. 2016. “Predictions of Rotor and Rotor/Airframe Configurational Effects on Brownout Dust Clouds.” Journal of Aircraft 53 (2): 545–60. https://doi.org/10.2514/1.c033447
- Govindarajan, Bharath, J. Gordon Leishman, and Nail A. Gumerov. 2013. “Particle-Clustering Algorithms for the Prediction of Brownout Dust Clouds.” AIAA Journal 51 (5): 1080–94. https://doi.org/10.2514/1.j051907
- Grahame, William E. 1969. “Aerodynamic Effects of Lift-Jet and Lift-Fan Inlets in Transition Flight.” Journal of Aircraft 6 (2): 150–55. https://doi.org/10.2514/3.44022
- Green, Michael D., Ahmet Duyar, and Jonathan S. Litt. 1997. “Model-Based Fault Diagnosis for Turboshaft Engines.” IFAC Proceedings Volumes 30 (18): 73–78. https://doi.org/10.1016/s1474-6670(17)42383-4
- Gu, Nannan, Xi Wang, and Shubo Yang. 2022. “Explicit Model Predictive Based Fault Tolerant Control for Turboshaft Engine System.” IEEE Access 10: 34637–53. https://doi.org/10.1109/access.2022.3162269
- Gu, Nannan, Xi Wang, and Meiyin Zhu. 2021. “Multi-Parameter Quadratic Programming Explicit Model Predictive Based Real Time Turboshaft Engine Control.” Energies 14 (17): 5539. https://doi.org/10.3390/en14175539
- Guan, Mingjing, and Bin Xian. 2025. “Robust Control of Tilt-Rotor Aircraft Based on Adaptive Backstepping Method.” In 2025 44th Chinese Control Conference (CCC). IEEE. https://doi.org/10.23919/ccc64809.2025.11179014
- Guan, Ruoqiao, Rui Xing, Ning Hao, Fenghua He, and Yu Yao. 2025. “A Switch-Based Control Allocation Framework for Omnidirectional Tiltrotor Aircraft.” In 2025 44th Chinese Control Conference (CCC). IEEE. https://doi.org/10.23919/ccc64809.2025.11178863
- Guedel, A., and A. Farrando. 1986. “Experimental Study of Turboshaft Engine Core Noise.” Journal of Aircraft 23 (10): 763–67. https://doi.org/10.2514/3.45378
- Gul, Seyhan, and Hyeonsoo Yeo. 2024. “Correlation of High-Speed Tiltrotor Stability Predictions with Test Data and Parametric Study.” Journal of Aircraft 61 (4): 1283–92. https://doi.org/10.2514/1.c037807
- Guo, Yueping, and Russell H. Thomas. 2015b. “System Noise Assessment of Hybrid Wing–Body Aircraft with Open-Rotor Propulsion.” Journal of Aircraft 52 (6): 1767–79. https://doi.org/10.2514/1.c033048
- Guo, Yueping, and Russell H. Thomas. 2016. “Experimental Study on Open Rotor Noise Shielding by Hybrid-Wing-Body Aircraft.” AIAA Journal 54 (1): 242–53. https://doi.org/10.2514/1.j054243
- Guruswamy, Guru P. 2019. “Dynamic Aeroelasticity of Wings with Tip Propeller by Using Navier–Stokes Equations.” AIAA Journal 57 (8): 3200–3205. https://doi.org/10.2514/1.j058610
- Habib, Michael R., Mohammed A. Hassan, and Abdel M. Bayoumi. 2018. “Effect of Tail-Rotor Torque Variation on Vibration at Helicopter Tail-Rotor Drive-Train.” In 2018 IEEE Aerospace Conference. IEEE. https://doi.org/10.1109/aero.2018.8396732
- Haixu, Li, Qu Xiangju, and Wang Weijun. 2010. “Multi-Body Motion Modeling and Simulation for Tilt Rotor Aircraft.” Chinese Journal of Aeronautics 23 (4): 415–22. https://doi.org/10.1016/s1000-9361(09)60236-3
- Halder, Atanu, and Moble Benedict. 2018. “Role of Blade Flexibility on Cycloidal Rotor Hover Performance.” Journal of Aircraft 55 (5): 1773–91. https://doi.org/10.2514/1.c034712
- Hammer, T., N. Raaf, B. Ritterbach, S. de Graaf, L. Richter, and A. Treder. 2026. “Wing Design and Powertrain Integration for a Distributed Electric Propulsion Demonstrator Aircraft.” CEAS Aeronautical Journal. https://doi.org/10.1007/s13272-026-00999-3
- Han, Sibo, Yichen Cao, Xiaoxiang Shi, et al. 2025. “Design and Performance Evaluation of a Turboshaft Engine/proton Exchange Membrane Fuel Cell Hydrogen Hybrid Propulsion System.” Journal of Power Sources 652: 237663. https://doi.org/10.1016/j.jpowsour.2025.237663
- Han, Ziyang, Kunzhi Liu, and Mingsui Yang. 2026. “Data-Driven Multivariable Predictive Control via Segmented Trajectories: Application to Turboshaft Engine Speed Regulation.” In 2026 38th Chinese Control and Decision Conference (CCDC). IEEE. https://doi.org/10.1109/ccdc69976.2026.11560669
- Han, Dong, and Edward C. Smith. 2013. “Lagwise Dynamic Analysis of a Variable Speed Rotor.” Aerospace Science and Technology 29 (1): 277–86. https://doi.org/10.1016/j.ast.2013.03.010
- Han, Dong, Joseph Wang, Edward C. Smith, and George A. Lesieutre. 2013. “Transient Loads Control of a Variable Speed Rotor during Lagwise Resonance Crossing.” AIAA Journal 51 (1): 20–29. https://doi.org/10.2514/1.j050598
- Haramura Bastos, Servio Tulio Suenai, and Rui Marcos Grombone de Vasconcellos. 2026. “Effectiveness of Direct and Hybrid Piezoelectric Control for Whirl Flutter.” AIAA Journal 64 (5): 2836–51. https://doi.org/10.2514/1.j066013
- Hartmann, Philipp, Carsten Meyer, and Dieter Moormann. 2017. “Unified Velocity Control and Flight State Transition of Unmanned Tilt-Wing Aircraft.” Journal of Guidance, Control, and Dynamics 40 (6): 1348–59. https://doi.org/10.2514/1.g002168
- Hassenpflug, Walter C. 1996. “Momentum and Vortex Theory of Rotor Blade Wakes.” AIAA Journal 34 (8): 1741–42. https://doi.org/10.2514/3.13299
- Hathaway, Eric L., and Farhan Gandhi. 2006. “Tiltrotor Whirl Flutter Alleviation Using Actively Controlled Wing Flaperons.” AIAA Journal 44 (11): 2524–34. https://doi.org/10.2514/1.18428
- He, David, Eric Bechhoefer, and Andy Hess. 2025. “Automated Rotorcraft Turboshaft Engine Performance Prediction Using a Transfer Learning Approach.” In 2025 IEEE Aerospace Conference. IEEE. https://doi.org/10.1109/aero63441.2025.11068693
- He, Ao, Honggang Gao, Shanshan Zhang, et al. 2022. “Full Mode Flight Dynamics Modelling and Control of Stopped-Rotor UAV.” Chinese Journal of Aeronautics 35 (10): 95–105. https://doi.org/10.1016/j.cja.2022.03.016
- Henkenjohann, Mark, Udo Nolte, Christian Henke, and Ansgar Trächtler. 2023. “Novel Cascaded Incremental Nonlinear Dynamic Inversion Controller Approach for a Tiltrotor VTOL.” In 2023 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas57906.2023.10156317
- Henriksson, Mattias, Tomas Grönstedt, and Claes Breitholtz. 2011. “Model-Based on-Board Turbofan Thrust Estimation.” Control Engineering Practice 19 (6): 602–10. https://doi.org/10.1016/j.conengprac.2011.02.004
- Henschel, Frohmut, Ermin Plaetschke, and Hans-Kurt Schulze. 1974. “Minimum Noise Climbout Trajectories of a VTOL Aircraft.” Journal of Aircraft 11 (7): 429–32. https://doi.org/10.2514/3.60361
- Herbst, S., G. Wortmann, and M. Hornung. 2015. “Conceptual Design Studies of Vertical Takeoff and Landing Remotely Piloted Aircraft Systems for Hybrid Missions.” CEAS Aeronautical Journal 7 (1): 135–48. https://doi.org/10.1007/s13272-015-0176-x
- Hernandez-Garcia, Rogelio G., and H. Rodriguez-Cortes. 2015. “Transition Flight Control of a Cyclic Tiltrotor UAV Based on the Gain-Scheduling Strategy.” In 2015 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas.2015.7152383
- Hilby, Kristan, Max Hughes, and Ian Hunter. 2025a. “Design of a Six-Bar Linkage-Inspired Reversible Wing for Stopped-Rotor Vehicles.” In 2025 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS). IEEE. https://doi.org/10.1109/iros60139.2025.11247589
- Hilby, Kristan, Max Hughes, and Ian Hunter. 2025b. “Slat-Inspired Reversible Wing for Stopped-Rotor Vehicles.” In 2025 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas65942.2025.11007875
- Hill, T. Gardner. 1971. “An All Turbofan VTOL or STOL Intercity Transport.” Journal of Aircraft 8 (4): 254–57. https://doi.org/10.2514/3.44264
- Hill, G. C., and M. H. Waters. 1975. “Conceptual Design of a Lift Fan Plus Lift/Cruise Fighter Aircraft.” Journal of Aircraft 12 (10): 763–68. https://doi.org/10.2514/3.59870
- Ho, Jimmy C., and Hyeonsoo Yeo. 2018. “Assessing Calculated Blade Loads of the Tilt Rotor Aeroacoustic Model.” Journal of Aircraft 55 (3): 1287–98. https://doi.org/10.2514/1.c034624
- Hoffman, W. C., J. Zvara, A. E. Bryson, and N. D. Ham. 1971. “Automatic Guidance Concept for VTOL Aircraft.” Journal of Aircraft 8 (8): 637–42. https://doi.org/10.2514/3.59150
- Hohenemser, Kurt H., and S. T. Crews. 1973. “Model Tests on Unsteady Rotor Wake Effects.” Journal of Aircraft 10 (1): 58–60. https://doi.org/10.2514/3.44350
- Hong, Je Won, and Phillip J. Ansell. 2018. “Influence of Freestream Velocity on Tilt-Rotor Fountain Effect.” Journal of Aircraft 55 (4): 1742–45. https://doi.org/10.2514/1.c034599
- Hoover, Christian B., and Jinwei Shen. 2018a. “Parametric Study of Propeller Whirl Flutter Stability with Full-Span Model of X-57 Maxwell Aircraft.” Journal of Aircraft 55 (6): 2530–37. https://doi.org/10.2514/1.c035081
- Hoover, Christian B., and Jinwei Shen. 2019b. “Whirl Flutter Analysis of a Free-Flying Electric-Driven Propeller Aircraft.” Journal of Aircraft 56 (2): 831–36. https://doi.org/10.2514/1.c035263
- Hoover, Christian B., Jinwei Shen, and Andrew R. Kreshock. 2018. “Propeller Whirl Flutter Stability and Its Influence on X-57 Aircraft Design.” Journal of Aircraft 55 (5): 2169–75. https://doi.org/10.2514/1.c034950
- Hou, Zheng, Zongyang Lv, and Yuhu Wu. 2025. “Finite-Time Attitude Control Design of a Coaxial Tilt-Rotor eVTOL under Rotor Fault.” IFAC-PapersOnLine 59 (20): 2507–12. https://doi.org/10.1016/j.ifacol.2025.11.535
- Houbolt, John C., and Wilmer H. Reed. 1962. “Propeller-Nacelle Whirl Flutter.” Journal of the Aerospace Sciences 29 (3): 333–46. https://doi.org/10.2514/8.9417
- Hu, Kaixuan, Wen Li, and Shuang Shi. 2024c. “Fuzzy-Based Adaptive Tracking Control for the Conversion Mode of Tilt-Rotor Aircraft.” In 2024 39th Youth Academic Annual Conference of Chinese Association of Automation (YAC). IEEE. https://doi.org/10.1109/yac63405.2024.10598456
- Hu, Kaixuan, Shuang Shi, Ju Jiang, and Shouzhao Sheng. 2024a. “Almost Output Regulation for the Conversion Mode of Tiltrotor Aircraft via Switched T-S Fuzzy Modeling.” Journal of the Franklin Institute 361 (3): 1631–44. https://doi.org/10.1016/j.jfranklin.2024.01.028
- Hu, Zhiyuan, Peng Yu, Guohua Xu, Yongjie Shi, Feng Gu, and Aijun Zou. 2024b. “Comparative Study of Soft in-Plane and Stiff in-Plane Tiltrotor Blade Aerodynamics in Conversion Flight, Using CFD-CSD Coupling Approach.” Aerospace 11 (1): 77. https://doi.org/10.3390/aerospace11010077
- Hu-Sheng Wu, Wei-Zong Lu, and Yu-Long Wang. 2015. “Research on the Structure Design and Flight Performance of a Small Tilt Rotor Unmanned Aircraft.” In 2015 Chinese Automation Congress (CAC). IEEE. https://doi.org/10.1109/cac.2015.7382829
- Huang, Qingjin, Guoyi He, Jike Jia, Zhile Hong, and Feng Yu. 2024. “Numerical Simulation on Aerodynamic Characteristics of Transition Section of Tilt-Wing Aircraft.” Aerospace 11 (4): 283. https://doi.org/10.3390/aerospace11040283
- Huang, Jing, Ban Wang, Yangping Deng, Kaikai Ning, and Youmin Zhang. 2022. “Aerodynamic Design of Fixed-Wing Mode for a Ducted-Fan Tiltrotor UAV by Digital DATCOM.” In 2022 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas54217.2022.9836066
- Huang, Huaping, Li Yu, Guang He, and Xiangke Wang. 2020. “Tilting Curve Design of a Novel Tilt-Rotor UAV Based on Rotor/Wing Interference Model.” In 2020 Chinese Automation Congress (CAC). IEEE. https://doi.org/10.1109/cac51589.2020.9326872
- Huangzhong, Pu, Zhen Ziyang, and Gao Chen. 2014. “Tiltrotor Aircraft Attitude Control in Conversion Mode Based on Optimal Preview Control.” In Proceedings of 2014 IEEE Chinese Guidance, Navigation and Control Conference. IEEE. https://doi.org/10.1109/cgncc.2014.7007422
- Hyun, Jeongseok, Minseok Jang, Tuan Anh Nguyen, and Jae-Woo Lee. 2023. “Transition Control Planning and Optimization for a Boxed-Wing eVTOL Tiltrotor Vehicle Using Trim Analysis.” In 2023 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas57906.2023.10156619
- Irmawan, Erwhin, Agus Harjoko, and Andi Dharmawan. 2023. “Model, Control, and Realistic Visual 3D Simulation of VTOL Fixed-Wing Transition Flight Considering Ground Effect.” Drones 7 (5): 330. https://doi.org/10.3390/drones7050330
- Ishikawa, Hiroaki, Dong-Youn Kwak, and Kenji Yoshida. 2008. “Numerical Analysis on Flight-Test Results of Supersonic Experimental Airplane NEXST-1.” Journal of Aircraft 45 (5): 1505–13. https://doi.org/10.2514/1.33595
- J. Victor Lebacqz; Edwin W. Aiken. 1978. “Experimental Investigation of Control-Display Requirements for VTOL Instrument Transition.” Journal of Guidance, Control, and Dynamics 1 (4): 261–68. https://doi.org/10.2514/3.55774
- Jacobson, Daniel H. 1965. “An Evaluation of Lift Engines in Tactical Vtol Aircraft.” Journal of Aircraft 2 (5): 424–29. https://doi.org/10.2514/3.43678
- Jacobson, Kevin E., and Marilyn J. Smith. 2018. “Carefree Hybrid Methodology for Rotor Hover Performance Analysis.” Journal of Aircraft 55 (1): 52–65. https://doi.org/10.2514/1.c034112
- Jakubowski, Robert, and Piotr Jakliński. 2024. “A Practical Approach to Modeling and Performance Analysis of a Turboshaft Engine Using Matlab.” Applied Sciences 14 (23): 11373. https://doi.org/10.3390/app142311373
- Jatsun, S., Luis Miguel Mosquera Morocho, O. Emelyanova, and Andres Santiago Martinez Leon. 2020a. “Controlled Adaptive Flight of a Convertiplane Type Tricopter in Conditions of Uncertainty for Monitoring Water Areas.” In 2020 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon). IEEE. https://doi.org/10.1109/fareastcon50210.2020.9271078
- Jiang, Tianhong, Yaolong Liu, and Yao Zheng. 2025. “Ducted Fan Design for VTOL Aircraft Flight Mission Based on Bayesian Optimization.” Journal of Aircraft 62 (3): 660–71. https://doi.org/10.2514/1.c037541
- Jiang, Yun, and Bo Zhang. 2016a. “Numerical Investigation of Effect of Parameters on Hovering Efficiency of an Annular Lift Fan Aircraft.” Aerospace 3 (4): 35. https://doi.org/10.3390/aerospace3040035
- Jiang, Yun, and Bo Zhang. 2016b. “Numerical Study of Transition of an Annular Lift Fan Aircraft.” Aerospace 3 (4): 30. https://doi.org/10.3390/aerospace3040030
- Jiang, Yun, Bo Zhang, and Tao Huang. 2015. “CFD Study of an Annular-Ducted Fan Lift System for VTOL Aircraft.” Aerospace 2 (4): 555–80. https://doi.org/10.3390/aerospace2040555
- Jin, Bao, Biao Wang, Jian Wang, Chaoying Tang, and Hongcheng Li. 2023. “Design of Full-Mode Flight Control System for Tiltrotor Aircraft Based on Model Compensation Reduced-Order Active Disturbance Rejection Controller.” In 2023 China Automation Congress (CAC). IEEE. https://doi.org/10.1109/cac59555.2023.10450381
- Johnson, Wayne. 1977b. “Optimal Control Alleviation of Tilting Proprotor Gust Response.” Journal of Aircraft 14 (3): 301–8. https://doi.org/10.2514/3.44594
- Johnson, Walter A., and Samuel J. Craig. 1976. “Configuration Management during Transition for a Powered-Lift STOL Aircraft.” Journal of Aircraft 13 (2): 119–22. https://doi.org/10.2514/3.58640
- Jones, Arthur G. 1971a. “Parameter Variation-An Insight to V/STOL Design.” Journal of Aircraft 8 (8): 629–33. https://doi.org/10.2514/3.59149
- Joshi, Alaukik, Amritanshu Tripathi, and R. N. Ponnalgu. 2019. “Modelling and Design of a Hybrid Aerial Vehicle Combining VTOL Capabilities with Fixed Wing Aircraft.” In 2019 6th International Conference on Instrumentation, Control, and Automation (ICA). IEEE. https://doi.org/10.1109/ica.2019.8916678
- Jou, Wen-Huei. 1989. “Supersonic Propeller Noise in a Uniform Flow.” AIAA Journal 27. https://ntrs.nasa.gov/citations/19890044537
- Juhasz, Ondrej, Mark B. Tischler, and Roberto Celi. 2023. “Comparison of Linear Flexible Aircraft Model Structures on Large Flexible Tiltrotor Aircraft.” Journal of Aircraft 60 (5): 1601–12. https://doi.org/10.2514/1.c037085
- Kaballo, Eliav, and Shai Arogeti. 2024. “Simple Interpolating Control with Non-Symmetric Input Constraints for a Tilt- Rotor UAV.” In 2024 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas60882.2024.10556925
- Kahvecioglu, Ahmet Caner, and Nafiz Alemdaroglu. 2015. “Optimal Design of a Miniature Quad Tilt Rotor UAV.” In 2015 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas.2015.7152404
- Kai, Jean-Marie. 2024. “Full-Envelope Flight Control for Compound Vertical Takeoff and Landing Aircraft.” Journal of Guidance, Control, and Dynamics 47 (8): 1569–85. https://doi.org/10.2514/1.g007917
- Kalra, Tarandeep S., and James D. Baeder. 2017. “Modeling Subscale Rotor Wake in Ground Effect with Accurate Turbulent Length Scales.” AIAA Journal 55 (9): 3085–94. https://doi.org/10.2514/1.j055647
- Kambampati, Sandilya, and Edward C. Smith. 2017. “Aeroelastic Optimization of High-Speed Tiltrotor Wings with Wing Extensions and Winglets.” Journal of Aircraft 54 (5): 1718–27. https://doi.org/10.2514/1.c034195
- Kanai, K., P. N. Nikiforuk, and M. M. Gupta. 1976. “On a Constrained Design of an Optimal Controller for VTOL Aircraft.” IFAC Proceedings Volumes 9 (1): 534–52. https://doi.org/10.1016/s1474-6670(17)67147-7
- Kanayath, Sunilkumar, M. Jayakumar, and G. R. Bindu. 2012. “Estimation of Longitudinal Aerodynamic Coefficients of a Technology Demonstrator Aircraft Using Modified Maximum Likelihood Algorithm.” In 2012 IEEE International Conference on Computational Intelligence and Computing Research. IEEE. https://doi.org/10.1109/iccic.2012.6510222
- Kandath, Harikumar, Mohamad Abdul Hady, Mahardhika Pratama, and Ng Bing Feng. 2019. “Robust Evolving Neuro-Fuzzy Control of a Novel Tilt-Rotor Vertical Takeoff and Landing Aircraft.” In 2019 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE). IEEE. https://doi.org/10.1109/fuzz-ieee.2019.8858923
- Kang, Namuk, Linghai Lu, and James Whidborne. 2025a. “Energy Optimization Strategies for Automatic Tiltrotor Electric Vertical Takeoff and Landing Aircraft.” Journal of Guidance, Control, and Dynamics 48 (5): 1196–1200. https://doi.org/10.2514/1.g008466
- Kang, Hao, Jinwei Shen, and Andrew R. Kreshock. 2017. “Validation of Comprehensive Analysis for Tiltrotor Whirl Flutter Predictions.” Journal of Aircraft 54 (4): 1566–70. https://doi.org/10.2514/1.c034272
- Kato, Kanichiro, and Takashi Yamane. 1979. “A Calculation of Rotor Impedance for Hovering Articulated-Rotor Helicopters.” Journal of Aircraft 16 (1): 15–22. https://doi.org/10.2514/3.58477
- Kaul, Upender K., and Jasim Ahmad. 2012. “Skin-Friction Predictions on a Hovering Tilt-Rotor Blade.” Journal of Aircraft 49 (6): 1726–38. https://doi.org/10.2514/1.c031401
- Kawachi, Keiji. 1982. “Extension of Local Momentum Theory to Hovering Rotor with Distorted Wake.” Journal of Aircraft 19 (7): 538–45. https://doi.org/10.2514/3.44771
- Kaya, Tarik. 1998. “Influence of Inlet Pressure Distortion on a Convertible Engine Fan.” Journal of Propulsion and Power 14 (1): 82–89. https://doi.org/10.2514/2.5253
- Kaza, Krishna Rao Venkata. 1973. “Effect of Steady State Coning Angle and Damping on Whirl Flutter Stability.” Journal of Aircraft 10 (11): 664–69. https://doi.org/10.2514/3.60280
- Kazan, E., and J. Krause. 1968. “Comparative Analysis of Effects of Hover Control Concept on V/STOL Aircraft Size.” Journal of Aircraft 5 (4): 387–94. https://doi.org/10.2514/3.43955
- Ke, Lu, Wang Zhengzhong, and Cheng Qiyou. 2014. “Design of Flight Control System for Tiltrotor Conversion Using QFT.” In The 26th Chinese Control and Decision Conference (2014 CCDC). IEEE. https://doi.org/10.1109/ccdc.2014.6852702
- Kemp, E. D. G. 1969. “Studies of Exhaust-Gas Recirculation for VTOL Aircraft.” Journal of Aircraft 6 (2): 102–8. https://doi.org/10.2514/3.44015
- Kentfield, J. A. C. 1967. “Nozzles for Jet-Lift V/STOL Aircraft.” Journal of Aircraft 4 (4): 283–91. https://doi.org/10.2514/3.43836
- Khader, N., and R. Abu-Mallouh. 1992. “A Structural Dynamics Study of a Wing-Pylon-Tiltrotor System.” Computers & Structures 45 (5–6): 1061–71. https://doi.org/10.1016/0045-7949(92)90061-4
- Kim, Jin H., S. Andrew Gadsden, and Stephen A. Wilkerson. 2016. “Adaptive Integral Sliding Mode Controller for Longitudinal Rotation Control of a Tilt-Rotor Aircraft.” In 2016 24th Mediterranean Conference on Control and Automation (MED). IEEE. https://doi.org/10.1109/med.2016.7536004
- Kim, Minhee, Sanghoon Kim, Woore Kim, Chongam Kim, and Yushin Kim. 2011. “Flow Control of Tiltrotor Unamnned-Aerial-Vehicle Airfoils Using Synthetic Jets.” Journal of Aircraft 48 (3): 1045–57. https://doi.org/10.2514/1.c031225
- Kim, C., and J. Lee. 2007a. “Hub Drag-Reduction Strategies of Canard Rotor/Wing Unmanned Aerial Vehicles.” Journal of Aircraft 44 (4): 1389–91. https://doi.org/10.2514/1.24395
- Kim, Taeseong, Jaehoon Lim, SangJoon Shin, and Do-Hyung Kim. 2013. “Structural Design Optimization of a Tiltrotor Aircraft Composite Wing to Enhance Whirl Flutter Stability.” Composite Structures 95: 283–94. https://doi.org/10.1016/j.compstruct.2012.08.019
- Kim, Taeseong, and SangJoon Shin. 2008. “Advanced Analysis on Tiltrotor Aircraft Flutter Stability, Including Unsteady Aerodynamics.” AIAA Journal 46 (4): 1002–12. https://doi.org/10.2514/1.33474
- Kim, Taeseong, SangJoon Shin, and Taehyoun Kim. 2009. “Analysis of Tiltrotor Whirl Flutter in Time and Frequency Domain.” Journal of Mechanical Science and Technology 23 (12): 3281–91. https://doi.org/10.1007/s12206-009-1002-3
- Kim, Haedong, Marc H. Williams, and Anastasios S. Lyrintzis. 2002. “Improved Method for Rotor Wake Capturing.” Journal of Aircraft 39 (5): 794–803. https://doi.org/10.2514/2.3025
- Kini, Santosh, and A. T. Conlisk. 2002. “Nature of Locally Steady Rotor Wakes.” Journal of Aircraft 39 (5): 750–58. https://doi.org/10.2514/2.3021
- Knott, P. G. 1978. “V/STOL Aerodynamic Testing Techniques at British Aircraft Corporation.” Journal of Aircraft 15 (6): 339–44. https://doi.org/10.2514/3.58367
- Koch, Christopher. 2021. “Parametric Whirl Flutter Study Using Different Modelling Approaches.” CEAS Aeronautical Journal 13 (1): 57–67. https://doi.org/10.1007/s13272-021-00548-0
- Koch, Christopher, Nils Böhnisch, Hendrik Verdonck, Oliver Hach, and Carsten Braun. 2024. “Comparison of Unsteady Low- and Mid-Fidelity Propeller Aerodynamic Methods for Whirl Flutter Applications.” Applied Sciences 14 (2): 850. https://doi.org/10.3390/app14020850
- Koch, Christopher, and Benedikt Koert. 2024. “Including Blade Elasticity into Frequency-Domain Propeller Whirl Flutter Analysis.” Journal of Aircraft 61 (3): 774–84. https://doi.org/10.2514/1.c037501
- Kong, Ming, Bin Pei, Qi Liu, Yan Qiao, and Yong Xu. 2025. “Dynamics and Reliability Design of Tilt-Rotor Aircraft with Nonlinearity and Stochasticity.” AIAA Journal 63 (10): 4085–4104. https://doi.org/10.2514/1.j065364
- Koratkar, Nikhil A., and Inderjit Chopra. 2002. “Open-Loop Hover Testing of a Smart Rotor Model.” AIAA Journal 40 (8): 1495–1502. https://doi.org/10.2514/2.1834
- Kosyanchuk, Vladislav V., Eugene Yu. Zybin, Vladislav V. Glasov, Alexey V. Lapin, Sergey S. Karpenko, and Alexey M. Lelikov. 2023. “High-Speed Rotorcraft Flight Control System Fault Tolerance under Parametric Uncertainty.” In 2023 XX Technical Scientific Conference on Aviation Dedicated to the Memory of N.E. Zhukovsky (TSCZh). IEEE. https://doi.org/10.1109/tsczh58792.2023.10233650
- Kreshock, Andrew R., Robert P. Thornburgh, Hao Kang, and Hyeonsoo Yeo. 2025a. “Experimental and Analytical Comparison of Stiff and Flexible Rotor Blades for Whirl-Flutter Stability.” CEAS Aeronautical Journal. https://doi.org/10.1007/s13272-025-00909-z
- Krimphove, Johannes, Marten Schütt, Patrick Osterloh, and Dieter Moormann. 2023. “Trimmed Flight States of an over-Actuated Tilt-Wing Aircraft for Linear Controller Synthesis.” In 2023 IEEE Conference on Control Technology and Applications (CCTA). IEEE. https://doi.org/10.1109/ccta54093.2023.10252262
- Krishnamurthy, P., and F. Khorrami. 2011. “Adaptive Backstepping and θ-D Based Controllers for a Tilt-Rotor Aircraft.” In 2011 19th Mediterranean Conference on Control & Automation (MED). IEEE. https://doi.org/10.1109/med.2011.5983085
- Kuhn, R. E. 1982. “Design Concepts for Minimizing Hot-Gas Ingestion in V/STOL Aircraft.” Journal of Aircraft 19 (10): 845–50. https://doi.org/10.2514/3.61567
- Kumar Cheeda, Vijaya, R. Vinod Kumar, and G. Nagarajan. 2008. “Design and CFD Analysis of a Regenerator for a Turboshaft Helicopter Engine.” Aerospace Science and Technology 12 (7): 524–34. https://doi.org/10.1016/j.ast.2007.12.005
- Kunz, Donald L. 2005. “Analysis of Proprotor Whirl Flutter: Review and Update.” Journal of Aircraft 42 (1): 172–78. https://doi.org/10.2514/1.4953
- Kutney, J. T. 1966. “Propulsion System Development for V/STOL TRANSPORTS.” Journal of Aircraft 3 (6): 489–97. https://doi.org/10.2514/3.43767
- Kvaternik, Raymond G. 1976. “A Review of Some Tilt-Rotor Aeroelastic Research at NASA-Langley.” Journal of Aircraft 13 (5): 357–63. https://doi.org/10.2514/3.44530
- L’Ecuyer, M. R., J. J. Morrison, and W. E. Mallett. 1971. “Correlation of Turbofan Engine Thrust Performance with Comnound Nozzle Flow Theorv.” Journal of Aircraft 8 (7): 510–16. https://doi.org/10.2514/3.59131
- Lang, Jinxi, Yan Li, Yuqing Qiu, and Zhong Wang. 2024b. “Incremental Nonlinear Dynamic Inversion Control for Coaxial Compound Helicopter.” In 2024 36th Chinese Control and Decision Conference (CCDC). IEEE. https://doi.org/10.1109/ccdc62350.2024.10587543
- Lang, Jinxi, Yan Li, Yuqing Qiu, and Zhong Wang. 2024c. “Nonlinear Dynamic Inversion Based Full Envelope Robust Flight Control for Coaxial Compound Helicopter.” Aerospace Science and Technology 154: 109526. https://doi.org/10.1016/j.ast.2024.109526
- Lavi, R. 1967. “An Experimental Investigation of VTOL Lift- Engine Inlet.” Journal of Aircraft 4 (2): 125–32. https://doi.org/10.2514/3.43808
- Lee, Jae-Woo, Kwon-Su Jeon, Min-Ji Kim, Yung-Hwan Byun, Chang J. Kim, and Yung H. Yu. 2006. “Rotor Design for the Performance Optimization of Canard Rotor/Wing Aircraft.” In Computational Science and Its Applications - ICCSA 2006. Springer Berlin Heidelberg. https://doi.org/10.1007/11751649_102
- Lee, Myeong Kyu, and In Lee. 2013. “Performance Enhancement of Tilt-Rotor Unmanned Aerial Vehicle Using Nacelle-Fixed Auxiliary Wing.” Journal of Aircraft 50 (1): 319–24. https://doi.org/10.2514/1.c031896
- Lee, Donguk, Daejin Lim, and Kwanjung Yee. 2022. “Generic Design Methodology for Vertical Takeoff and Landing Aircraft with Hybrid-Electric Propulsion.” Journal of Aircraft 59 (2): 278–92. https://doi.org/10.2514/1.c036214
- Lee, Donguk, and Kwanjung Yee. 2024. “Novel Electric Propulsion System Analysis Method for Electric Vertical Takeoff and Landing Aircraft Conceptual Design.” Journal of Aircraft 61 (2): 375–91. https://doi.org/10.2514/1.c037225
- Lefevre, Lauriane, Vianney Nowinski, Jérôme Delva, and Antoine Dazin. 2022a. “Experimental Velocity Fields Evaluation of the Rotor/propeller Interactions for High-Speed Helicopters with Different Propeller Positions.” Experiments in Fluids 63 (12): 189. https://doi.org/10.1007/s00348-022-03537-z
- Leishman, J. Gordon. 2002. “Introduction: Rotor Wakes.” Journal of Aircraft 39 (5): 721–721. https://doi.org/10.2514/2.2999
- Li, Hai, Zaibin Chen, and Hongguang Jia. 2023. “Experimental Investigation on Hover Performance of a Ducted Coaxial-Rotor UAV.” Sensors 23 (14): 6413. https://doi.org/10.3390/s23146413
- Li, Liang, Ming Chen, Fang Wang, and Anan Xu. 2022. “The Influence of Rotor Adjustment Parameters on the Dynamic Balance of a Scale-Model Rigid Variable Speed Rotor.” Applied Sciences 12 (23): 12125. https://doi.org/10.3390/app122312125
- Li, Yanan, Haiwang Li, Gang Xie, and Zhi Tao. 2025a. “Configuration Trade-Off and Co-Design Optimization of Hybrid-Electric VTOL Propulsion Systems.” Drones 9 (11): 800. https://doi.org/10.3390/drones9110800
- Li, Zhiquan, and Pinqi Xia. 2017. “Aeroelastic Stability of Full-Span Tiltrotor Aircraft Model in Forward Flight.” Chinese Journal of Aeronautics 30 (6): 1885–94. https://doi.org/10.1016/j.cja.2017.09.007
- Li, Jiaying, Xu Zhao, Xinyuan Liu, Haiyang Yu, Linyan Huang, and Long He. 2025d. “Simulation Analysis of Aerodynamic Noise of Highspeed Compound Helicopter with Twin Propellers in Different Flight States.” In 2025 International Conference of Mechanical Engineering on Aerospace (CoMEA). IEEE. https://doi.org/10.1109/comea66280.2025.11241530
- Liang, Tingting, Weihong Wang, Sentang Wu, and Ke Lu. 2017. “Nonlinear Attitude Control of Tiltrotor Aircraft Based on Dynamic Surface Adaptive Backstepping.” In 2017 29th Chinese Control And Decision Conference (CCDC). IEEE. https://doi.org/10.1109/ccdc.2017.7978265
- Liang, Junkai, Hui Ye, Yaohua Shen, and Dawei Wu. 2025. “Transition Process Control of Tiltrotor Aircraft Based on Fractional-Order Model Reference Adaptive Control.” Machines 13 (6): 439. https://doi.org/10.3390/machines13060439
- Liao, Jingxian, and Hyochoong Bang. 2023. “Transition Nonlinear Blended Aerodynamic Modeling and Anti-Harmonic Disturbance Robust Control of Fixed-Wing Tiltrotor UAV.” Drones 7 (4): 255. https://doi.org/10.3390/drones7040255
- Liao, Wenan, Yunjie Yang, Jinlai Deng, Jihong Zhu, Xiangyang Wang, and Xiaming Yuan. 2024. “Identification of Aerodynamic Coupling during Vertical Takeoff and Landing of Tilt-Rotor Aircraft.” In 2024 China Automation Congress (CAC). IEEE. https://doi.org/10.1109/cac63892.2024.10864884
- Lieblein, S., J. A. Yuska, and J. H. Diedrich. 1973. “Performance Characteristics of a Model VTOL Lift Fan in Crossflow.” Journal of Aircraft 10 (3): 131–36. https://doi.org/10.2514/3.44357
- Lindqvist, Adrian, Emil Fresk, and George Nikolakopoulos. 2015. “Optimal Design and Modeling of a Tilt Wing Aircraft.” In 2015 23rd Mediterranean Conference on Control and Automation (MED). IEEE. https://doi.org/10.1109/med.2015.7158828
- Litt, Jonathan, Mehmet Kurtkaya, and Ahmet Duyar. 1995. “Sensor Fault Detection and Diagnosis for a T700 Turboshaft Engine.” Journal of Guidance, Control, and Dynamics 18 (3): 640–42. https://doi.org/10.2514/3.21439
- Liu, Changqi, Aijun Li, Guangzhan Duan, and Xuesong Hu. 2026b. “Optimal Rotational Speed Rotor Load Reduction Control in Coaxial High: Speed Helicopter/engine Integration System.” Aerospace Science and Technology 168: 111181. https://doi.org/10.1016/j.ast.2025.111181
- Liu, Zhun, and Mingfu Liao. 2019. “Scale Model Design of a Turboshaft Engine with Mid Turbine Frame.” In 2019 IEEE 10th International Conference on Mechanical and Aerospace Engineering (ICMAE). IEEE. https://doi.org/10.1109/icmae.2019.8881024
- Liu, Xiaofeng, and Chenshuang Luo. 2017. “Stability Analysis for GE T700 Turboshaft Distributed Engine Control Systems.” IEEE Access 5: 22485–91. https://doi.org/10.1109/access.2017.2762081
- Liu, Xuejun, Hailong Tang, Xin Zhang, and Min Chen. 2021. “Gaussian Process Model-Based Performance Uncertainty Quantification of a Typical Turboshaft Engine.” Applied Sciences 11 (18): 8333. https://doi.org/10.3390/app11188333
- Liu, Hangxian, Ningning Wang, Zheshuo Zhang, and Hui Yin. 2024a. “Agile and Precise Attitude Control of Tiltrotor Aircraft in Transition Flight.” IEEE Transactions on Intelligent Vehicles 9 (1): 787–98. https://doi.org/10.1109/tiv.2023.3317387
- Liu, Juhong, and Song Zhang. 2024. “Tilt-Rotor Vertical Takeoff and Landing UAV Oblique Takeoff Trajectory Optimization.” In 2024 International Conference on Intelligent Robotics and Automatic Control (IRAC). IEEE. https://doi.org/10.1109/irac63143.2024.10871517
- Lo, Ching-Fang. 1970. “Test Section for a V/STOL Wind Tunnel.” Journal of Aircraft 7 (4): 380–82. https://doi.org/10.2514/3.44187
- Lo, Ching-Fang. 1971. “Wind-Tunnel Boundary Interference on a V/STOL Model.” Journal of Aircraft 8 (3): 162–67. https://doi.org/10.2514/3.44248
- Lombaerts, Thomas, Kimberlee Shish, and John Kaneshige. 2022. “Trim Envelope Calculations for a Tiltrotor in Forward Flight, Hover and Transitions.” IFAC-PapersOnLine 55 (6): 611–16. https://doi.org/10.1016/j.ifacol.2022.07.195
- Lopez, C. A., and V. L. Wells. 2004. “Dynamics and Stability of an Autorotating Rotor/Wing Unmanned Aircraft.” Journal of Guidance, Control, and Dynamics 27 (2): 258–70. https://doi.org/10.2514/1.1065
- Louisse, Jan, and Franklin L. Marshall. 1976. “Prediction of Ground Effects for VTOL Aircraft with Twin Lifting Jets.” Journal of Aircraft 13 (2): 123–27. https://doi.org/10.2514/3.58641
- Lovell-Prescod, Gervase H. L. H., Ziqing Ma, and Ewoud J. J. Smeur. 2023. “Attitude Control of a Tilt-Rotor Tailsitter Micro Air Vehicle Using Incremental Control.” In 2023 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas57906.2023.10156272
- Lu, Yalan, Dong Cao, Qiang Qu, and Jiakui Zu. 2023a. “Active Disturbance Rejection Control for a Compound Helicopter during Transitional Period.” In 2023 China Automation Congress (CAC). IEEE. https://doi.org/10.1109/cac59555.2023.10450274
- Lu, Ke, Chunsheng Liu, Chunhua Li, and Renliang Chen. 2019. “Flight Dynamics Modeling and Dynamic Stability Analysis of Tilt-Rotor Aircraft.” International Journal of Aerospace Engineering 2019: 1–15. https://doi.org/10.1155/2019/5737212
- Lu, K., Chunsheng Liu, Zhengzhong Wang, and Weihong Wang. 2016a. “L1adaptive Output Feedback Controller for Tilt-Rotor Aircraft.” In 2016 IEEE Chinese Guidance, Navigation and Control Conference (CGNCC). IEEE. https://doi.org/10.1109/cgncc.2016.7829184
- Lu, Ke, Chunsheng Liu, Zhengzhong Wang, and Weihong Wang. 2016b. “Modeling and Control of Tilt-Rotor Aircraft.” In 2016 Chinese Control and Decision Conference (CCDC). IEEE. https://doi.org/10.1109/ccdc.2016.7531046
- Lu, Ke, Hongyuan Tian, Pan Zhen, Senkui Lu, and Renliang Chen. 2022. “Conversion Flight Control for Tiltrotor Aircraft via Active Disturbance Rejection Control.” Aerospace 9 (3): 155. https://doi.org/10.3390/aerospace9030155
- Lu, Wang, Daibing Zhang, Jiyang Zhang, Tengxiang Li, and Tianjiang Hu. 2017. “Design and Implementation of a Gasoline-Electric Hybrid Propulsion System for a Micro Triple Tilt-Rotor VTOL UAV.” In 2017 6th Data Driven Control and Learning Systems (DDCLS). IEEE. https://doi.org/10.1109/ddcls.2017.8068112
- Luis Fajardo Rodriguez and Ruxandra Mihaela Botez. 2012. “Civil Turbofan Engines Thrust Generic Model.” In IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society. IEEE. https://doi.org/10.1109/iecon.2012.6389521
- Lytviak, Oleksandr, Vasyl Loginov, Sergii Komar, and Yevhen Martseniuk. 2021. “Self-Oscillations of the Free Turbine Speed in Testing Turboshaft Engine with Hydraulic Dynamometer.” Aerospace 8 (4): 114. https://doi.org/10.3390/aerospace8040114
- Ma, Yue, Lu Lin, and Yu Wang. 2018. “Fault Diagnosis of the Speed Sensor of Electro-Mechanical Transmission of the High Speed Rotorcraft.” In 2018 10th International Conference on Modelling, Identification and Control (ICMIC). IEEE. https://doi.org/10.1109/icmic.2018.8529966
- Ma, Jinchao, Yang Lu, Xice Xu, and Huiyu Yue. 2022. “Research on near Field Aeroacoustics Suppression of Tilt-Rotor Aircraft Based on Rotor Phase Control.” Applied Acoustics 186: 108451. https://doi.org/10.1016/j.apacoust.2021.108451
- Ma, Ziqing, Ewoud J. J. Smeur, and Guido C. H. E. de Croon. 2025. “Design and Control of a Tilt-Rotor Tailsitter Aircraft with Pivoting VTOL Capability.” IEEE Robotics and Automation Letters 10 (6): 5911–18. https://doi.org/10.1109/lra.2025.3563821
- Mair, Christopher, Djamel Rezgui, and Branislav Titurus. 2018. “Nonlinear Stability Analysis of Whirl Flutter in a Rotor-Nacelle System.” Nonlinear Dynamics 94 (3): 2013–32. https://doi.org/10.1007/s11071-018-4472-y
- Mair, Christopher, Branislav Titurus, and Djamel Rezgui. 2021. “Stability Analysis of Whirl Flutter in Rotor-Nacelle Systems with Freeplay Nonlinearity.” Nonlinear Dynamics 104 (1): 65–89. https://doi.org/10.1007/s11071-021-06271-z
- Maldonado, Victor, Nicolas Peralta, Serdar Gorumlu, and Wolduamlak Ayele. 2021. “On the Figure of Merit and Streamwise Flow of a Propulsive Rotor with Synthetic Jets.” Aerospace Science and Technology 113: 106712. https://doi.org/10.1016/j.ast.2021.106712
- Manimala, Binoy, Gareth D. Padfield, and Daniel Walker. 2006. “Load Alleviation for a Tilt-Rotor Aircraft in Airplane Mode.” Journal of Aircraft 43 (1): 147–56. https://doi.org/10.2514/1.13565
- Manningham, Dan. 1985. “Operating Tips for Turboshaft Engines.” Hospital Aviation 4 (2): 10. https://doi.org/10.1016/s0740-8315(85)80023-1
- Mao, Haotian, Yingqing Guo, Ruichao Li, and Chenyang Lai. 2019. “Versatile Simulation Platform for Turboshaft Engine Control System.” In 2019 Chinese Control Conference (CCC). IEEE. https://doi.org/10.23919/chicc.2019.8865902
- Marano, Aniello Daniele, Marika Belardo, Jacopo Beretta, et al. 2022. “Aeroelastic Tailoring of the Next Generation Civil Tiltrotor Technological Demonstrator Composite Wing.” Aerospace 9 (7): 335. https://doi.org/10.3390/aerospace9070335
- Marano, Aniello Daniele, Gianluca Diodati, Nicola Paletta, Luigi Di Palma, Marika Belardo, and Pierre Abdel Nour. 2023. “Structural Scalability Preliminary Studies for the Next Generation Civil Tiltrotor Composite Wing.” Aerospace 10 (5): 478. https://doi.org/10.3390/aerospace10050478
- Marinus, Benoît G. 2014. “Comparative Study of Effects of Sweep and Humps on High-Speed Propeller Blades.” AIAA Journal 52 (4): 739–46. https://doi.org/10.2514/1.j052833
- Mascarello, Laura Novaro, Fulvia Quagliotti, and Gianluca Ristorto. 2017. “A Feasibility Study of an Harmless Tiltrotor for Smart Farming Applications.” In 2017 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas.2017.7991374
- Mattaboni, Mattia, Pierangelo Masarati, Giuseppe Quaranta, and Paolo Mantegazza. 2012. “Multibody Simulation of Integrated Tiltrotor Flight Mechanics, Aeroelasticity and Control.” Journal of Guidance, Control, and Dynamics 35 (5): 1391–1405. https://doi.org/10.2514/1.57309
- May, Marc, Daniel Milz, Sophie Armanini, and Gertjan Looye. 2025. “Transition Strategies for Tilt-Wing Aircraft.” Journal of Guidance, Control, and Dynamics 48 (10): 2326–37. https://doi.org/10.2514/1.g008257
- May, Marc, Daniel Milz, Sophie F. Armanini, and Gertjan Looye. 2026a. “Impact of Failure on the Tilt-Wing eVTOL Backward Transition.” Journal of Aircraft 63 (2): 553–65. https://doi.org/10.2514/1.c038391
- McVeigh, Michael A., Hassan Nagib, Tom Wood, and Israel Wygnanski. 2011. “Full-Scale Flight Tests of Active Flow Control to Reduce Tiltrotor Aircraft Download.” Journal of Aircraft 48 (3): 786–96. https://doi.org/10.2514/1.46956
- Mehra, R. K., R. K. Prasanth, and S. Gopalaswamy. 1998. “XV-15 Tiltrotor Flight Control System Design Using Model Predictive Control.” In 1998 IEEE Aerospace Conference Proceedings (Cat. No.98TH8339), vol. 2. IEEE. https://doi.org/10.1109/aero.1998.687905
- Mehrabi, Ali, and Ali R. Davari. 2020. “Outwash Flow Measurement around the Subscale Tandem Rotor in Ground Effect.” Engineering Science and Technology, an International Journal 23 (6): 1374–84. https://doi.org/10.1016/j.jestch.2020.08.016
- Meier, Wilfried H., and John R. Olson. 1988. “Efficient Sizing of a Cargo Rotorcraft.” Journal of Aircraft 25 (6): 538–43. https://doi.org/10.2514/3.45619
- Mendela, D. K. 1971. “Simulator Investigation of the VTOL Transport.” Journal of Aircraft 8 (10): 783–89. https://doi.org/10.2514/3.59171
- Mihaila, Florin, Ion Fuiorea, and Grigore Cican. 2026. “Hover Performance and Uncertainty Quantification of a Light-Twin Helicopter Rotor.” Eng 7 (7): 335. https://doi.org/10.3390/eng7070335
- Mikami, Takahito, and Kenji Uchiyama. 2015. “Design of Flight Control System for Quad Tilt-Wing UAV.” In 2015 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas.2015.7152364
- Miller, R. H. 1983. “Rotor Hovering Performance Using the Method of Fast Free Wake Analysis.” Journal of Aircraft 20 (3): 257–61. https://doi.org/10.2514/3.44861
- Miller, David G., Terry M. Black, and Mukund Joglekar. 1991. “Tiltrotor Control Law Design for Rotor Loads Alleviation Using Modern Control Techniques.” In 1991 American Control Conference. IEEE. https://doi.org/10.23919/acc.1991.4791852
- Miller, David P., and James W. Clark. 1965. “Research on Vtol Aircraft Handling Qualities Criteria.” Journal of Aircraft 2 (3): 194–201. https://doi.org/10.2514/3.43639
- Milluzzo, Joseph I., and J. Gordon Leishman. 2017. “Vortical Sheet Behavior in the Wake of a Rotor in Ground Effect.” AIAA Journal 55 (1): 24. https://doi.org/10.2514/1.j054498
- Min, Byung-Young, and Brian Wake. 2018. “Modified Hybrid Navier–Stokes/Free-Wake Method for Hovering Rotor Analysis.” Journal of Aircraft 55 (1): 38–51. https://doi.org/10.2514/1.c034066
- Min-ze, Chen, Chen Yu-chun, Fan Wei, Zhang Shao-feng, and Li Xia-xin. 2019. “Research on Overall Design of Turboshaft Engine Based on Data Analysis Method.” In 2019 IEEE 10th International Conference on Mechanical and Aerospace Engineering (ICMAE). IEEE. https://doi.org/10.1109/icmae.2019.8880964
- Misté, Gianluigi Alberto, and Ernesto Benini. 2016. “Variable-Speed Rotor Helicopters: Performance Comparison between Continuously Variable and Fixed-Ratio Transmissions.” Journal of Aircraft 53 (5): 1189–1200. https://doi.org/10.2514/1.c032744
- Mix, D. R., J. S. Koenig, K. M. Linda, O. Cifdaloz, V. L. Wells, and A. A. Rodriguez. 2004. “Towards Gain-Scheduled H/sup /Spl Infin// Control Design for a Tilt-Wing Aircraft.” In 2004 43rd IEEE Conference on Decision and Control (CDC) (IEEE Cat. No.04CH37601). IEEE. https://doi.org/10.1109/cdc.2004.1430208
- Morishita, Ryosuke, Shin Kawai, and Hajime Nobuhara. 2024. “Downwash Reduction Drone with Adaptive Rotors and Its 3D Aerodynamic Analysis and Stabilization Control.” IEEE Access 12: 22832–40. https://doi.org/10.1109/access.2024.3362639
- Morris, W. B., R. L. McCORMICK, and J. B. Sinacori. 1964. “Moving-Base Simulator Study of an All- Mechanical Control System for Vtol Aircraft.” Journal of Aircraft 1 (1): 41–45. https://doi.org/10.2514/3.43557
- Moustafa, Nader M., Katea L. Hamid, and Ehsan S. Al -Ameen. 2025. “Landing Trajectories Improvement of a Vertical Takeoff and Landing Aircraft Systems Considering Linear Quadratic Regulator Strategy.” Aerospace Systems 8 (4): 953–61. https://doi.org/10.1007/s42401-025-00381-x
- Muehlbauer, J. C., and S. J. Morris. 1983. “Advanced Turboprop Cargo Aircraft Systems Study.” Journal of Aircraft 20 (6): 523–29. https://doi.org/10.2514/3.44903
- Müller, L., D. Kožulović, and R. Radespiel. 2014. “Aerodynamic Performance of an over-the-Wing Propeller Configuration at Increasing Mach Number.” CEAS Aeronautical Journal 5 (3): 305–17. https://doi.org/10.1007/s13272-014-0108-1
- Muscarello, Vincenzo, Francesca Colombo, Giuseppe Quaranta, and Pierangelo Masarati. 2019. “Aeroelastic Rotorcraft–Pilot Couplings in Tiltrotor Aircraft.” Journal of Guidance, Control, and Dynamics 42 (3): 524–37. https://doi.org/10.2514/1.g003922
- Muscarello, Vincenzo, and Giuseppe Quaranta. 2024. “Exploration of the Effects of Rotor Blade Twist on Whirl-Flutter Stability Boundaries.” Journal of Aircraft 61 (2): 570–85. https://doi.org/10.2514/1.c037479
- Nallasamy, M., B. J. Clark, and J. F. Groeneweg. 1988b. “High-Speed Propeller Noise Predictions: Effects of Boundary Conditions Used in Blade Loading Calculations.” Journal of Aircraft 25 (2): 154–62. https://doi.org/10.2514/3.45556
- Nallasamy, M., R. P. Woodward, and J. F. Groeneweg. 1989. “High-Speed Propeller Performance and Noise Predictions at Takeoff/landing Conditions.” Journal of Aircraft 26 (6): 563–69. https://doi.org/10.2514/3.45803
- Neitzel, R. E., R. Hirschkron, and P. W. Vinson. 1985. “Studies of Convertible Turboshaft/turbofan Engines for High-Speed Rotorcraft.” Journal of Aircraft 22 (4): 296–302. https://doi.org/10.2514/3.45123
- Neumann, Patrick P., Paul Hirschberger, and Matthias Bartholmai. 2020. “Influence of Rotor Downwash on Vertically Displaced Nanobots in Flight.” Materials Today: Proceedings 32: 108–11. https://doi.org/10.1016/j.matpr.2020.03.047
- Newton, Richard, and Thomas Searle. 2016. “SOF, Airpower, and Special Operations Airmen: Limited by Our Own Imaginations.” Special Operations Journal 2 (1): 33–46. https://doi.org/10.1080/23296151.2016.1165579
- Nie, Weijian, Xiaoguang Yang, Guang Tang, Qicheng Zhang, and Ge Wang. 2024a. “Effect of Oil Film Radial Clearances on Dynamic Characteristics of Variable Speed Rotor with Non-Concentric SFD.” Machines 12 (12): 882. https://doi.org/10.3390/machines12120882
- Nishimura, Hiroshi. 1980. “Fuel Minimal Takeoff Path of Jet Lift VTOL Aircraft.” Journal of Aircraft 17 (5): 290–91. https://doi.org/10.2514/3.57903
- Nitzsche, F. 1989b. “Whirl-Flutter Investigation on an Advanced Turboprop Configuration.” Journal of Aircraft 26 (10): 939–46. https://doi.org/10.2514/3.45865
- Nitzsche, Fred. 1991. “Insights on the Whirl-Flutter Phenomena of Advanced Turboprops and Propfans.” Journal of Aircraft 28 (7): 463–70. https://doi.org/10.2514/3.46050
- Nitzsche, F. 1994. “Whirl-Flutter Suppression in Advanced Turboprops and Propfans by Active Control Techniques.” Journal of Aircraft 31 (3): 713–19. https://doi.org/10.2514/3.46552
- Nitzsche, F., and E. A. Rodrigues. 1992. “Whirl-Flutter Stability of a Pusher Configuration in Nonuniform Flow.” Journal of Aircraft 29 (4): 727–29. https://doi.org/10.2514/3.46233
- Niwa, S., and I. Sugiura. 1987. “An Automatic Flight Control System for VTOL Aircraft Supported by Ducted Fans.” IFAC Proceedings Volumes 20 (5): 145–50. https://doi.org/10.1016/s1474-6670(17)55195-2
- Notarstefano, Giuseppe, and John Hauser. 2010. “Modeling and Dynamic Exploration of a Tilt-Rotor VTOL Aircraft.” IFAC Proceedings Volumes 43 (14): 119–24. https://doi.org/10.3182/20100901-3-it-2016.00182
- Nunes, Jessica S. M., Weihua Su, and Tianyi He. 2025. “Nonlinear Model Predictive Control for Stabilizing Tiltrotor Urban Air Mobility Aircraft under Control Effector Failures.” Aerospace Science and Technology 165: 110517. https://doi.org/10.1016/j.ast.2025.110517
- O’Brien, Nathan T., and Anubhav Datta. 2026b. “Understanding High-Speed Aeroelastic Stability of a Hingeless Hub Proprotor.” Journal of Aircraft 63 (5): 2170–83. https://doi.org/10.2514/1.c038655
- Okuno, Yoshinori, and Keiji Kawachi. 1993. “Optimal Takeoff Procedures for a Transport Category Tiltrotor.” Journal of Aircraft 30 (3): 291–92. https://doi.org/10.2514/3.46332
- Omar, Zamri, Cees Bil, and Robin Hill. 2007. “The Application of Fuzzy Logic on Transition Manoeuvre Control of a New Ducted-Fan VTOL UAV Configuration.” In Second International Conference on Innovative Computing, Informatio and Control (ICICIC 2007). IEEE. https://doi.org/10.1109/icicic.2007.562
- Osa, Yasuhiro, Shuma Ioka, Takaya Masada, Kosuke Sakamoto, and Shigeru Uchikado. 2022. “A Study on Longitudinal Attitude Control of Tilt Rotor Aircraft against Gyro Effect by Tilting Rotor Nacelles.” In 2022 International Automatic Control Conference (CACS). IEEE. https://doi.org/10.1109/cacs55319.2022.9969858
- Osa, Yasuhiro, Kosuke Sakamoto, and Shigeru Uchikado. 2021. “A Study on Simultaneous Vertical and Lateral Translation Mode for Hovering Tilt Rotor Aircraft.” In 2021 International Automatic Control Conference (CACS). IEEE. https://doi.org/10.1109/cacs52606.2021.9736673
- Osa, Yasuhiro, Shigeru Uchikado, and Kanya Tanaka. 2014. “Study on Roll Angle Control for Hovering Tilt Rotor Aircraft on One Side Thrust Reduction.” In 2014 CACS International Automatic Control Conference (CACS 2014). IEEE. https://doi.org/10.1109/cacs.2014.7097175
- Osa, Yasuhiro, Shigeru Uchikado, and Kanya Tanaka. 2016. “Roll Angle Control Using Opposite Side Rotor Hub Moment for Hovering Tilt Rotor Aircraft on One Side Rotor Lift Variation.” In 2016 International Automatic Control Conference (CACS). IEEE. https://doi.org/10.1109/cacs.2016.7973878
- Osa, Yasuhiro, Shigeru Uchikado, and Kanya Tanaka. 2017. “Pitch Angle Control for Hovering Tilt Rotor Aircraft on One Side Rotor Lift Variation.” In 2017 International Automatic Control Conference (CACS). IEEE. https://doi.org/10.1109/cacs.2017.8284254
- Osa, Yasuhiro, Shigeru Uchikado, and Kanya Tanaka. 2018. “A Study on Spin Turn Mode for Hovering Tilt Rotor Aircraft.” In 2018 International Automatic Control Conference (CACS). IEEE. https://doi.org/10.1109/cacs.2018.8606738
- Osder, S. S. n.d. “Integrated Navigation, Guidance, and Control for Canard Rotor/wing (CRW) Aircraft.” In AIAA/IEEE Digital Avionics Systems Conference. 13th DASC. IEEE. https://doi.org/10.1109/dasc.1994.369484
- Padula, S. L., and P. J. W. Block. 1985. “Predicted Changes in Advanced Turboprop Noise with Shaft Angle of Attack.” Journal of Propulsion and Power 1 (5): 381–87. https://doi.org/10.2514/3.22813
- Paik, Jinho, and Farhan Gandhi. 2010. “Design Optimization for Improved Soft in-Plane Tiltrotor Aeroelastic in Airplane Mode.” Journal of Aircraft 47 (4): 1089–99. https://doi.org/10.2514/1.43212
- Paik, Jinho, Rupinder Singh, Farhan Gandhi, and Eric Hathaway. 2007. “Active Tiltrotor Whirl-Flutter Stability Augmentation Using Wing-Flaperon and Swash-Plate Actuation.” Journal of Aircraft 44 (5): 1439–46. https://doi.org/10.2514/1.20234
- Paiva, Enrique, Marcelo Llano, Jorge Rodas, Raul Gregor, Jose Rodriguez-Pineiro, and Marcos Gomez-Redondo. 2018. “Design and Implementation of a VTOL Flight Transition Mechanism and Development of a Mathematical Model for a Tilt Rotor UAV.” In 2018 IEEE International Conference on Automation/XXIII Congress of the Chilean Association of Automatic Control (ICA-ACCA). IEEE. https://doi.org/10.1109/ica-acca.2018.8609836
- Palaia, Giuseppe, Karim Abu Salem, Vittorio Cipolla, Vincenzo Binante, and Davide Zanetti. 2021. “A Conceptual Design Methodology for e-VTOL Aircraft for Urban Air Mobility.” Applied Sciences 11 (22): 10815. https://doi.org/10.3390/app112210815
- Pan, Zhen, Chengzhi Chi, and Jingkai Zhang. 2018. “Nonlinear Attitude Control of Tiltrotor Aircraft in Helicopter Mode Based on ADRSM Theory.” In 2018 37th Chinese Control Conference (CCC). IEEE. https://doi.org/10.23919/chicc.2018.8483589
- Papachristos, Christos, Kostas Alexis, George Nikolakopoulos, and Anthony Tzes. 2011. “Model Predictive Attitude Control of an Unmanned Tilt-Rotor Aircraft.” In 2011 IEEE International Symposium on Industrial Electronics. IEEE. https://doi.org/10.1109/isie.2011.5984282
- Papachristos, Christos, Kostas Alexis, and Anthony Tzes. 2012. “Towards a High-End Unmanned Tri-TiltRotor: Design, Modeling and Hover Control.” In 2012 20th Mediterranean Conference on Control & Automation (MED). IEEE. https://doi.org/10.1109/med.2012.6265864
- Papachristos, Christos, Kostas Alexis, and Anthony Tzes. 2013. “Trajectory Control of an Unmanned Tri-TiltRotor in Hover Flight via Direct Longitudinal Actuation.” In 21st Mediterranean Conference on Control and Automation. IEEE. https://doi.org/10.1109/med.2013.6608748
- Park, Hyunbum. 2016. “Advanced Turboprop Composite Propeller Design and Analysis Using Fluid–structure Interaction Method.” Composites Part B: Engineering 97: 111–19. https://doi.org/10.1016/j.compositesb.2016.04.054
- Park, Jae-Sang, Sung Nam Jung, Myeong-Kyu Lee, and Jai Moo Kim. 2010. “Design Optimization Framework for Tiltrotor Composite Wings Considering Whirl Flutter Stability.” Composites Part B: Engineering 41 (4): 257–67. https://doi.org/10.1016/j.compositesb.2010.03.005
- Park, Jae-Sang, Seong-Hwan Kim, and Sung Nam Jung. 2011. “Optimal Design of a Variable-Twist Proprotor Incorporating Shape Memory Alloy Hybrid Composites.” Composite Structures 93 (9): 2288–98. https://doi.org/10.1016/j.compstruct.2011.03.017
- Park, Junhee, Kunhyuk Kong, Gwangin Ko, and Sang Joon Shin. 2026. “Preliminary Design of a Drive System for a Midsized Coaxial Rotorcraft.” Journal of Aircraft 63 (1): 185–93. https://doi.org/10.2514/1.c038358
- Park, Minjun, and Se Hwan Park. 2026. “Sizing Method for Series Hybrid Electric Propulsion Systems in Vertical Take-off and Landing (VTOL) Aircraft.” Aerospace Science and Technology 168: 110745. https://doi.org/10.1016/j.ast.2025.110745
- Pauli, Frank A. 1965. “A System to Vary the Stability and Control of a Deflected-Jet, Fixed-Wing Vtol Aircraft.” Journal of Aircraft 2 (1): 39–43. https://doi.org/10.2514/3.43616
- Peng, Kai, Yuxuan Wei, Ai He, Jiashuai Liu, and Feng Lu. 2026. “Preview-Aware LSTM-Assisted Predictive Control for Turboshaft Engines under Tiltrotor Conversion-Flight Power Demand.” Aerospace 13 (9): 843. https://doi.org/10.3390/aerospace13090843
- Peterson, J. M. 1965. “Lift Fan Vstol Concept for Future Applications.” Journal of Aircraft 2 (2): 94–99. https://doi.org/10.2514/3.43624
- Petrotto, Andrea, Lorenzo Franchi, Giuseppe Mattei, and Luca Pugi. 2026. “Design and Simulation of a Hybrid Propulsion System for an Autonomous Compound Helicopter.” Machines 14 (5): 498. https://doi.org/10.3390/machines14050498
- Pfeil, William H., Michael Athans, and H. Austin Spang. 1986. “Multi-Variable Control of the GE T700 Engine Using the LQG/LTR Design Methodology.” In 1986 American Control Conference. IEEE. https://doi.org/10.23919/acc.1986.4789132
- Phillips, Catriona, and Richard E. Brown. 2009. “Eulerian Simulation of the Fluid Dynamics of Helicopter Brownout.” Journal of Aircraft 46 (4): 1416–29. https://doi.org/10.2514/1.41999
- Pierce, Troy B., and Jeffrey R. Komives. 2024. “Kingfish Ace: Application of Gaming to Help Air Force Leaders Understand Agile Combat Employment.” Journal of Leadership Studies 17 (4): 64–70. https://doi.org/10.1002/jls.21877
- Pipenberg, Benjamin T., Sara A. Langberg, Jeremy D. Tyler, and Matthew T. Keennon. 2022. “Conceptual Design of a Mars Rotorcraft for Future Sample Fetch Missions.” In 2022 IEEE Aerospace Conference (AERO). IEEE. https://doi.org/10.1109/aero53065.2022.9843820
- PlCKERELL, D. J., and R. A. Cresswell. 1968. “Powerplant Aspects of High-Speed, Inter-City VTOL Aircraft.” Journal of Aircraft 5 (5): 467–72. https://doi.org/10.2514/3.43968
- Polak, David R., and Albert R. George. 1998. “Flowfield and Acoustic Measurements from a Model Tiltrotor in Hover.” Journal of Aircraft 35 (6): 921–29. https://doi.org/10.2514/2.2387
- Pölzlbauer, Patrick, Andreas Kümmel, Damien Desvigne, and Christian Breitsamter. 2021. “Numerical Investigation of an Optimized Rotor Head Fairing for the RACER Compound Helicopter in Cruise Flight.” Aerospace 8 (3): 66. https://doi.org/10.3390/aerospace8030066
- Popa, Adrian, Octavian - Narcis Volintiru, Daniel Mărășescu, and Marius Cucu. 2025. “Aspects of High Speed Propeller Simulation.” In 2025 10th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE). IEEE. https://doi.org/10.1109/eeae65901.2025.11273795
- Prasad, Rachit, and Seongim Choi. 2017. “Variable-Fidelity Aerodynamic Analysis of Lift Fan Type Aircraft.” Aerospace Science and Technology 71: 636–50. https://doi.org/10.1016/j.ast.2017.09.022
- Qiao, Xiaotao, and Jun Zhou. 2026. “A Multi-Fidelity Preliminary Sizing Methodology for Hybrid-Electric VTOL Aircraft.” Aerospace Science and Technology 168: 110825. https://doi.org/10.1016/j.ast.2025.110825
- Qing, Lin, Zhu Xingyu, and Liu Juanxia. 2022. “Frequency-Domain System Identification of Tiltrotor Aircraft: Compared with CIFER.” In 2022 8th International Conference on Control Science and Systems Engineering (ICCSSE). IEEE. https://doi.org/10.1109/iccsse55346.2022.10079792
- Qingsong, Zhao, Ding Junyi, Guo Yu, Liu Peng, and Yang Kewei. 2020. “A Scenario Construction and Similarity Measurement Method for Navy Combat Search and Rescue.” Journal of Systems Engineering and Electronics 31 (5): 957–68. https://doi.org/10.23919/jsee.2020.000064
- Quintana, A., B. E. Saunders, R. Vasconcellos, and A. Abdelkefi. 2023. “The Influence of Freeplay on the Whirl Flutter and Nonlinear Characteristics of Rotor-Nacelle Systems.” Meccanica 58 (4): 659–86. https://doi.org/10.1007/s11012-023-01658-1
- Quintana, Anthony, Rui Vasconcellos, Glen Throneberry, and Abdessattar Abdelkefi. 2021. “Nonlinear Analysis and Bifurcation Characteristics of Whirl Flutter in Unmanned Aerial Systems.” Drones 5 (4): 122. https://doi.org/10.3390/drones5040122
- Radil, Kevin, and Stephen Berkebile. 2020. “Failure Progression of Spur Gears during a Simulated Loss-of-Lubrication Event in a Rotorcraft Drive System.” Tribology Transactions 63 (4): 718–25. https://doi.org/10.1080/10402004.2020.1737285
- Rae, William H. 1967. “Limits on Minimum Speed V/STOL Wind-Tunnel Tests.” Journal of Aircraft 4 (3): 249–54. https://doi.org/10.2514/3.43828
- Ramanujam, Rahul, and Abhishek. 2022. “Analytical and Computational Study of Hover Performance of Novel Dissimilar Coaxial Rotor.” Journal of Aircraft 59 (6): 1529–44. https://doi.org/10.2514/1.c036664
- Ramnath, Rudrapatna V. 1970. “Transition Dynamics of VTOL Aircraft.” AIAA Journal 8 (7): 1214–21. https://doi.org/10.2514/3.5875
- Rand, Omri, and Richard J. Peyran. 2000. “Experimental Demonstration of the Influence of Wing Couplings on Whirl- Flutter Instability.” Journal of Aircraft 37 (5): 859–64. https://doi.org/10.2514/2.2681
- Ray, Ronald J., John W. Hicks, and Russ I. Alexander. 1990. “Development of a Real-Time Aeroperformance Analysis Technique for the X-29A Advanced Technical Demonstrator.” Journal of Aircraft 27 (7): 660–67. https://doi.org/10.2514/3.25337
- Reddinger, Jean-Paul, and Farhan Gandhi. 2015. “Physics-Based Trim Optimization of an Articulated Slowed-Rotor Compound Helicopter in High-Speed Flight.” Journal of Aircraft 52 (6): 1756–66. https://doi.org/10.2514/1.c032939
- Reed, Wilmer H. 1966. “Propeller-Rotor Whirl Flutter: A State-of-the-Art Review.” Journal of Sound and Vibration 4 (3): 526–44. https://doi.org/10.1016/0022-460x(66)90142-8
- Rehman, Kinza, Hafiz Zeeshan Iqbal Khan, and Muhammad Farooq Haydar. 2023. “Inverse Optimal Control Design of a VTOL Aircraft.” In 2023 20th International Bhurban Conference on Applied Sciences and Technology (IBCAST). IEEE. https://doi.org/10.1109/ibcast59916.2023.10712886
- Ristea, Marian, Adrian Popa, and Octavian-Narcis Volintiru. 2025. “CFD Design Performance Analysis for a High-Speed Propeller.” Applied Sciences 15 (15): 8754. https://doi.org/10.3390/app15158754
- Rodden, William P., and David T. Liu. 1969. “Correlation of the Vortex Lattice Method on Rotor/wing Configurations.” Journal of Aircraft 6 (4): 375–375. https://doi.org/10.2514/3.44068
- Rogers, K. H., R. Lavi, and G. R. Hall. 1969. “Experimental Investigations of Ground-Jet Suppression Fences for VTOL Aircraft Prepared Sites.” Journal of Aircraft 6 (3): 245–51. https://doi.org/10.2514/3.44043
- Rojo-Rodriguez, Edgar Ulises, Erik Gilberto Rojo-Rodriguez, Sergio A. Araujo-Estrada, and Octavio Garcia-Salazar. 2024. “Design and Performance of a Novel Tapered Wing Tiltrotor UAV for Hover and Cruise Missions.” Machines 12 (9): 653. https://doi.org/10.3390/machines12090653
- Rostami, Mohsen, Julian Bardin, Daniel Neufeld, and Joon Chung. 2023. “EVTOL Tilt-Wing Aircraft Design under Uncertainty Using a Multidisciplinary Possibilistic Approach.” Aerospace 10 (8): 718. https://doi.org/10.3390/aerospace10080718
- Rovere, Federico, George N. Barakos, and René Steijl. 2023. “Comparison between Eulerian and Lagrangian Methods to Predict Brownout Clouds.” Aerospace Science and Technology 137: 108306. https://doi.org/10.1016/j.ast.2023.108306
- Ruan, Yin, Weite Wang, and Wei Zhang. 2025. “Investigation of Tilt-Proprotor Loads Correlation between Wind Tunnel Test Data and Comprehensive Modeling.” Aerospace 12 (6): 452. https://doi.org/10.3390/aerospace12060452
- Rudolph, James F. 1972. “V/STOL Certification.” Journal of Aircraft 9 (3): 248–51. https://doi.org/10.2514/3.58965
- Rutherford, John W., Matthew J. O’Rourke, Marc A. Lovenguth, and Clark A. Mitchell. 1993b. “Conceptual Assessment of Two High-Speed Rotorcraft.” Journal of Aircraft 30 (2): 241–47. https://doi.org/10.2514/3.48272
- Rysdyk, R. T., and A. J. Calise. 1998. “Adaptive Nonlinear Control for Tiltrotor Aircraft.” In Proceedings of the 1998 IEEE International Conference on Control Applications (Cat. No.98CH36104), vol. 2. IEEE. https://doi.org/10.1109/cca.1998.721604
- Sagan, Daniel S., Mark T. Lau, and Brian J. German. 2025. “Minimum-Power Trim of Overactuated Multi-Tiltrotor Aircraft in Transition.” Journal of Aircraft 62 (6): 1640–49. https://doi.org/10.2514/1.c038007
- Saidi, Lotfi, and Eric Bechhoefer. 2026. “Remaining Useful Life Prediction of Turboshaft Engine Gears Using Spectral-Resynthesis Residual Method and Recursive Kalman Filtering.” Measurement 288: 122574. https://doi.org/10.1016/j.measurement.2026.122574
- Salter, G. R. 1975. “Method for Analysis of V/STOL Aircraft Ejectors.” Journal of Aircraft 12 (12): 974–78. https://doi.org/10.2514/3.59902
- Sambell, Kenneth W. 1972. “Proprotor Short-Haul Aircraft-STOL and VTOL.” Journal of Aircraft 9 (10): 744–50. https://doi.org/10.2514/3.59072
- Sanchez-Rivera, Luz M., Rogelio Lozano, and Alfredo Arias-Montano. 2019. “Pitching Moment Analysis and Adjustment for Tilt-Wing UAV in VTOL Mode.” In 2019 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas.2019.8797952
- Sanchez-Rivera, Luz M., Rogelio Lozano, and Alfredo Arias-Montano. 2020. “Transition Flight Dynamics of a Dual Tilt-Wing UAV.” In 2020 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas48674.2020.9214061
- Sankar, N. L., B. E. Wake, and S. G. Lekoudis. 1986. “Solution of the Unsteady Euler Equations for Fixed and Rotor Wing Configurations.” Journal of Aircraft 23 (4): 283–89. https://doi.org/10.2514/3.45301
- Sasongko, R. A., and B. Muhammad. 2017. “Modeling and Simulation of Rotor Dynamics of a Tilt-Rotor Aircraft.” In 2017 5th International Conference on Instrumentation, Communications, Information Technology, and Biomedical Engineering (ICICI-BME). IEEE. https://doi.org/10.1109/icici-bme.2017.8537783
- Savino, Alberto. 2025. “Multi-Fidelity Aerodynamic Optimization of the Wing Extension of a Tiltrotor Aircraft.” Applied Sciences 15 (17): 9491. https://doi.org/10.3390/app15179491
- Shahjahan, Shahfiq, Andrew Gong, Andrew Moore, and Dries Verstraete. 2024. “Optimisation of Proprotors for Tilt-Wing eVTOL Aircraft.” Aerospace Science and Technology 144: 108835. https://doi.org/10.1016/j.ast.2023.108835
- Shao-feng, Zhang, and Chen Yu-chun. 2018. “Research on Reverse Design of Turboshaft Engine Based on the Balance of Difficulty Factor.” In 2018 9th International Conference on Mechanical and Aerospace Engineering (ICMAE). IEEE. https://doi.org/10.1109/icmae.2018.8467673
- Sheen, Guanbin, Hexi Baoyin, Xianyu Wang, and Jingyang Li. 2023. “Modeling of Hovering Intermeshing Rotor Using Blade Element Momentum Theory.” Journal of Aircraft 60 (2): 560–76. https://doi.org/10.2514/1.c036528
- Shen, Jinwei, and Hao Kang. 2017. “Comparison Study of Tiltrotor Whirl Flutter Using Two Rotorcraft Comprehensive Analyses.” Journal of Aircraft 54 (2): 845–50. https://doi.org/10.2514/1.c033905
- Shen, Zhe, and Takeshi Tsuchiya. 2022. “Gait Analysis for a Tiltrotor: The Dynamic Invertible Gait.” Robotics 11 (2): 33. https://doi.org/10.3390/robotics11020033
- Sheng, Chunhua. 2018. “Role of Transition Modeling in Rotor Hover Predictions.” Journal of Aircraft 55 (1): 23–37. https://doi.org/10.2514/1.c034137
- Sheng, Hanlin, Chen Zhang, and Yulong Xiang. 2022. “Mathematical Modeling and Stability Analysis of Tiltrotor Aircraft.” Drones 6 (4): 92. https://doi.org/10.3390/drones6040092
- Sheng, Chunhua, Qiuying Zhao, and Matthew Hill. 2018. “Computational Investigation of a Full-Scale Proprotor Hover Performance and Flow Transition.” Journal of Aircraft 55 (1): 122–32. https://doi.org/10.2514/1.c034015
- Sheridan, Arthur E. 1986. “Turbine Bypass Remote Augmentor Lift System for V/STOL Aircraft.” Journal of Aircraft 23 (9): 703–10. https://doi.org/10.2514/3.45365
- Shouji, Cheng, Reza Alidoost Dafsari, Seung-Hwa Yu, Yong Choi, and Jeekeun Lee. 2021b. “Mean and Turbulent Flow Characteristics of Downwash Air Flow Generated by a Single Rotor Blade in Agricultural Drones.” Computers and Electronics in Agriculture 190: 106471. https://doi.org/10.1016/j.compag.2021.106471
- Shouji, Cheng, Seung-Hwa Yu, Yeong-Ho Kang, Yong Choi, Reza Alidoost Dafsari, and Jeekeun Lee. 2021a. “Experimental Analysis of the Downwash Airflow Created by a Single Rotor Blade in Agricultural Drones.” Journal of Biosystems Engineering 46 (4): 317–31. https://doi.org/10.1007/s42853-021-00109-7
- Simioni, Nicola, Rita Ponza, and Ernesto Benini. 2013. “Numerical Assessment of Pneumatic Devices on the Wing/Fuselage Junction of a Tiltrotor.” Journal of Aircraft 50 (3): 752–63. https://doi.org/10.2514/1.c031911
- Simmons, Benjamin M., and Patrick C. Murphy. 2022. “Aero-Propulsive Modeling for Tilt-Wing, Distributed Propulsion Aircraft Using Wind Tunnel Data.” Journal of Aircraft 59 (5): 1162–78. https://doi.org/10.2514/1.c036351
- Singh, Beerinder, and Inderjit Chopra. 2005. “Elastic-Blade Whirl Flutter Stability Analysis of Two-Bladed Proprotor/Pylon Systems.” Journal of Aircraft 42 (2): 519–27. https://doi.org/10.2514/1.2814
- Skifstad, J. G. 1970. “Aerodynamics of Jets Pertinent to VTOL Aircraft.” Journal of Aircraft 7 (3): 193–204. https://doi.org/10.2514/3.44146
- Smith, Marilyn J. 1996a. “Acceleration Techniques for an Aeroelastic Euler Method for a Hovering Rotor.” Journal of Aircraft 33 (2): 429–34. https://doi.org/10.2514/3.46955
- Son, Chankyu, and Taewoo Kim. 2023. “Actuator Disk Model with Improved Tip Loss Correction for Hover and Forward Flight Rotor Analysis.” Aerospace 10 (6): 494. https://doi.org/10.3390/aerospace10060494
- Song, Zhihong, Jie Hong, Zhefu Yang, Yitao Cao, and Yanhong Ma. 2025. “Dynamical Analysis of Propeller Rotors Whirl Flutter Considering Complex Blade Geometries and Induced Velocities.” Mechanical Systems and Signal Processing 230: 112621. https://doi.org/10.1016/j.ymssp.2025.112621
- Song, Ma, Tan Jianguo, Su Sanmai, and Zhu Mingyan. 2018. “Optimization for the Starting Process of Turbofan Engine under High-Altitude Environment.” IEEE Access 6: 55797–55806. https://doi.org/10.1109/access.2018.2868971
- Song, Jie, Shancheng Li, Shicheng Zhu, Yong Wang, and Haibo Zhang. 2024a. “Low-Emission Optimization Control Method for Coaxial Compound Helicopter/engine Based on Variable Geometry Adjustment.” Aerospace Science and Technology 151: 109263. https://doi.org/10.1016/j.ast.2024.109263
- Song, Wei, Liguo Sun, and Qi Wang. 2024b. “Nonlinear Constrained Optimization Method for Dynamic Conversion Corridor of Tilt-Rotor Aircraft.” Journal of Guidance, Control, and Dynamics 47 (12): 2661–66. https://doi.org/10.2514/1.g007721
- Song, Jie, Yong Wang, Chuang Ji, and Haibo Zhang. 2024c. “Real-Time Optimization Control of Variable Rotor Speed Based on Helicopter/ Turboshaft Engine on-Board Composite System.” Energy 301: 131701. https://doi.org/10.1016/j.energy.2024.131701
- Song, Siyang, Weihong Wang, Ke Lu, and Lianghua Sun. 2015. “Nonlinear Attitude Control Using Extended State Observer for Tilt-Rotor Aircraft.” In The 27th Chinese Control and Decision Conference (2015 CCDC). IEEE. https://doi.org/10.1109/ccdc.2015.7162038
- Song, Zhihong, Zhefu Yang, Yanghong Ma, et al. 2026. “Whirl Flutter Analysis of Counter-Rotating Propeller Rotors with Complex Geometrical Flexible Blades under Arbitrary Inflow Direction.” Applied Mathematical Modelling 158: 116953. https://doi.org/10.1016/j.apm.2026.116953
- Soykasap, Omer, and Dewey H. Hodges. 2000. “Performance Enhancement of a Composite Tilt-Rotor Using Aeroelastic Tailoring.” Journal of Aircraft 37 (5): 850–58. https://doi.org/10.2514/2.2680
- Sridhar, Pranav, and Marilyn J. Smith. 2026b. “Physics of the Proprotor–Wing Interactional Aerodynamics across the Tiltrotor Conversion Maneuver.” Journal of Aircraft: 1–16. https://doi.org/10.2514/1.c038965
- Srinivas, Venkataraman, and Inderjit Chopra. 1998a. “Formulation of a Comprehensive Aeroelastic Analysis for Tilt-Rotor Aircraft.” Journal of Aircraft 35 (2): 280–87. https://doi.org/10.2514/2.2296
- Srinivasan, G. R., and W. J. McCroskey. 1988. “Navier-Stokes Calculations of Hovering Rotor Flowfields.” Journal of Aircraft 25 (10): 865–74. https://doi.org/10.2514/3.45673
- Staruk, William, and Anubhav Datta. 2019. “Gimbaled Tiltrotor Conversion Flight Loads Prediction Using Three-Dimensional Structural Analysis.” Journal of Aircraft 56 (2): 758–70. https://doi.org/10.2514/1.c035075
- Steele, Robert, and Ralph Aurora. 1978. “Military: The U.S. Navy Bets on V/STOL: Integrating Technological Advances on a Broad Front Is the Key to Successful Vertical/short Takeoff and Landing Aircraft.” IEEE Spectrum 15 (9): 58–63. https://doi.org/10.1109/mspec.1978.6367872
- Steils, William T. 1966. “V/STOL Hover Control System Analysis.” Journal of Aircraft 3 (5): 469–77. https://doi.org/10.2514/3.59282
- Stepniewski, W. Z., and J. J. Schneider. 1964. “Design Philosophy and Operational Requirements of Subsonic Vtol Aircraft.” Journal of Aircraft 1 (3): 148–56. https://doi.org/10.2514/3.43571
- Sternfeld, Harry, and Ernest Hinterkeuser. 1970. “Effects of Noise on Commercial V/STOL Aircraft Design and Operation.” Journal of Aircraft 7 (3): 220–25. https://doi.org/10.2514/3.44149
- Stewart, V. R. 1980. “Lift-Cruise Fan V/STOL Configuration Characteristics near a Small Deck.” Journal of Aircraft 17 (9): 677–83. https://doi.org/10.2514/3.57954
- Stokkermans, Tom, Leo Veldhuis, Bambang Soemarwoto, Raphaël Fukari, and Paul Eglin. 2020. “Breakdown of Aerodynamic Interactions for the Lateral Rotors on a Compound Helicopter.” Aerospace Science and Technology 101: 105845. https://doi.org/10.1016/j.ast.2020.105845
- Strand, Trevor E. 2010. “V-22 Osprey Unprepared Surface Short Takeoff and Landing Evaluation.” In 2010 IEEE Aerospace Conference. IEEE. https://doi.org/10.1109/aero.2010.5446777
- Strawn, Roger C., Rupak Biswas, and Michael Garceau. 1995. “Unstructured Adaptive Mesh Computations of Rotorcraft High-Speed Impulsive Noise.” Journal of Aircraft 32 (4): 754–60. https://doi.org/10.2514/3.46787
- Strong, John C. 2011. “Downwash and Lift Force in Helicopter Flight.” Physics Teacher 49 (3): 132–132. https://doi.org/10.1119/1.3555492
- Stutz, Richard G., and George Price. 1964. “Agility Performance of Several Vstol and Stol Aircraft.” Journal of Aircraft 1 (5): 267–72. https://doi.org/10.2514/3.43593
- Sugawara, Hideaki, and Yasutada Tanabe. 2019. “Numerical Investigation of Rotor/Wing Aerodynamic Interactions at High Advance Ratios.” Journal of Aircraft 56 (6): 2285–98. https://doi.org/10.2514/1.c035370
- Sugawara, Hideaki, Yasutada Tanabe, and Masaharu Kameda. 2021. “Effect of Lift-Share Ratio on Aerodynamic Performance of Winged Compound Helicopter.” Journal of Aircraft 58 (5): 997–1009. https://doi.org/10.2514/1.c036163
- Sugawara, Hideaki, Yasutada Tanabe, and Masaharu Kameda. 2024. “Performance Improvement of Winged Compound Helicopter Due to Differential Flap Deflections.” Journal of Aircraft 61 (5): 1550–60. https://doi.org/10.2514/1.c037307
- Sun, Jie, Jun Yang, and Xiaoping Zhu. 2009. “Robust Flight Control Law Development for Tiltrotor Conversion.” In 2009 International Conference on Intelligent Human-Machine Systems and Cybernetics. IEEE. https://doi.org/10.1109/ihmsc.2009.243
- Sunkara, Vishwamithra, Wilfred Nobleheart, and Animesh Chakravarthy. 2014. “Performance Metrics for Tiltrotor Flight Dynamics during the Transition Regime.” Journal of Guidance, Control, and Dynamics 37 (6): 2039–44. https://doi.org/10.2514/1.g000310
- Swaim, Robert L. 1969. “Comment: VTOL Aircraft Dynamics.” Journal of Aircraft 6 (2): 176a-176a. https://doi.org/10.2514/3.44031
- Swaim, Robert L. 1970. “Minimum Control Power for VTOL Aircraft Stability Augmentation.” Journal of Aircraft 7 (3): 231–35. https://doi.org/10.2514/3.44151
- Swaim, Robert L., and Alonzo J. Connor. 1968. “Gust Velocity Spatial Distribution Effects on Lateral-Directional Response of VTOL Aircraft.” Journal of Aircraft 5 (1): 53–59. https://doi.org/10.2514/3.43907
- Syal, Monica, and J. Gordon Leishman. 2013a. “Modeling of Bombardment Ejections in the Rotorcraft Brownout Problem.” AIAA Journal 51 (4): 849–66. https://doi.org/10.2514/1.j051761
- Tai, Tsze C. 1996b. “Simulation and Analysis of V-22 Tiltrotor Aircraft Forward-Flight Flowfield.” Journal of Aircraft 33 (2): 369–76. https://doi.org/10.2514/3.46947
- Takarics, Béla, and Bálint Vanek. 2021. “Robust Control Design for the FLEXOP Demonstrator Aircraft via Tensor Product Models.” Asian Journal of Control 23 (3): 1290–1300. https://doi.org/10.1002/asjc.2547
- Talbot, Peter D., James D. Phillips, and Joseph J. Totah. 1993. “Selected Design Issues of Some High-Speed Rotorcraft Concepts.” Journal of Aircraft 30 (6): 864–71. https://doi.org/10.2514/3.46428
- Tam, C. K. W. 1983. “On Linear Acoustic Solutions of High Speed Helicopter Impulsive Noise Problems.” Journal of Sound and Vibration 89 (1): 119–34. https://doi.org/10.1016/0022-460x(83)90915-x
- Tammi, Kari, Jari Hätönen, and Steve Daley. 2007. “Novel Adaptive Repetitive Algorithm for Active Vibration Control of a Variable-Speed Rotor.” Journal of Mechanical Science and Technology 21 (6): 855–59. https://doi.org/10.1007/bf03027057
- Tan, Weirong, Yan Li, Yanqing Miao, and Haixia Lv. 2014. “The Analysis of Airworthiness Issues Influence to the Development of Tiltrotor Aircraft.” Procedia Engineering 80: 602–8. https://doi.org/10.1016/j.proeng.2014.09.116
- Tan, Jian Feng, Yi Ming Sun, and George N. Barakos. 2018. “Vortex Approach for Downwash and Outwash of Tandem Rotors in Ground Effect.” Journal of Aircraft 55 (6): 2491–2509. https://doi.org/10.2514/1.c034740
- Tan, Jian Feng, Tian Yi Zhou, Yi Ming Sun, and George N. Barakos. 2019. “Numerical Investigation of the Aerodynamic Interaction between a Tiltrotor and a Tandem Rotor during Shipboard Operations.” Aerospace Science and Technology 87: 62–72. https://doi.org/10.1016/j.ast.2019.02.005
- Tang, Yiqiao, Yipeng Yang, Chen Wu, and Zhan Li. 2025. “Fault Tolerant Control of Tilt-Rotor Aircraft Based on Adaptive Control Allocation.” In 2025 China Automation Congress (CAC). IEEE. https://doi.org/10.1109/cac67268.2025.11487048
- Tengfei Guo, Honglun Wang, and Wendong Gai. 2011. “Transition Flight Control for Canard Rotor/Wing Rotorcraft.” In 2011 2nd International Conference on Artificial Intelligence, Management Science and Electronic Commerce (AIMSEC). IEEE. https://doi.org/10.1109/aimsec.2011.6010405
- Tindell, Runyon H. 1966. “A Concise Approach to V/STOL Propulsion.” Journal of Aircraft 3 (3): 231–35. https://doi.org/10.2514/3.43730
- Tischler, M. B., J. G. M. Leung, and D. C. Dugan. 1986. “Identification and Verification of Frequency-Domain Models for XV-15 Tilt-Rotor Aircraft Dynamics in Cruising Flight.” Journal of Guidance, Control, and Dynamics 9. https://ntrs.nasa.gov/citations/19860061723
- Tritschler, John K., Roberto Celi, and J. Gordon Leishman. 2014. “Methodology for Rotorcraft Brownout Mitigation through Flight Path Optimization.” Journal of Guidance, Control, and Dynamics 37 (5): 1524–38. https://doi.org/10.2514/1.g000330
- Turan, Önder, and Hakan Aydın. 2016. “Numerical Calculation of Energy and Exergy Flows of a Turboshaft Engine for Power Generation and Helicopter Applications.” Energy 115: 914–23. https://doi.org/10.1016/j.energy.2016.09.070
- Tyan, Maxim, Nhu Van Nguyen, Sangho Kim, and Jae-Woo Lee. 2017. “Comprehensive Preliminary Sizing/resizing Method for a Fixed Wing – VTOL Electric UAV.” Aerospace Science and Technology 71: 30–41. https://doi.org/10.1016/j.ast.2017.09.008
- Udartsev, E. P., S. I. Alekseenko, and O. M. Pereverzev. 2015. “Aerodynamic Arrangement of Unmanned Convertiplane with Vortexactive Stabilizers.” In 2015 IEEE International Conference Actual Problems of Unmanned Aerial Vehicles Developments (APUAVD). IEEE. https://doi.org/10.1109/apuavd.2015.7346557
- Umer, Muhammad, Syed Mohsin Abbas Kazmi, Syed M. Hassan Askari, and Iftikhar Ahmad Rana. 2018. “Design and Modeling of VTOL Tri Tilt-Rotor Aircraft.” In 2018 15th International Conference on Smart Cities: Improving Quality of Life Using ICT & IoT (HONET-ICT). IEEE. https://doi.org/10.1109/honet.2018.8551474
- “V-22 Osprey Tilt-Rotor Flies.” 1989. Hospital Aviation 8 (5): 22–23. https://doi.org/10.1016/s0740-8315(89)80112-3
- Villanueva-Aguado, Mauro, and Murat Bronz. 2026. “INDI Control of Fixed-Wing Tilt-Rotor Applied to Tethered Flight.” In 2026 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas69441.2026.11598694
- Vladov, Serhii, Maryna Bulakh, Victoria Vysotska, and Ruslan Yakovliev. 2024c. “Onboard Neuro-Fuzzy Adaptive Helicopter Turboshaft Engine Automatic Control System.” Energies 17 (16): 4195. https://doi.org/10.3390/en17164195
- Vladov, Serhii, Viacheslav Kovtun, Valerii Sokurenko, Oleksandr Muzychuk, and Victoria Vysotska. 2024a. “Helicopter Turboshaft Engine Residual Life Determination by Neural Network Method.” Electronics 13 (15): 2952. https://doi.org/10.3390/electronics13152952
- Vladov, Serhii, Ruslan Yakovliev, Maryna Bulakh, and Victoria Vysotska. 2024b. “Neural Network Approximation of Helicopter Turboshaft Engine Parameters for Improved Efficiency.” Energies 17 (9): 2233. https://doi.org/10.3390/en17092233
- Waesche, J. E., and D. Migdal. 1977. “High-Perf Ormance Jet-V/STOL Development.” Journal of Aircraft 14 (2): 97–103. https://doi.org/10.2514/3.58753
- Walker, D. J., and P. Perfect. 2007. “Longitudinal Stability and Control of Large Tilt-Rotor Aircraft.” IFAC Proceedings Volumes 40 (7): 413–18. https://doi.org/10.3182/20070625-5-fr-2916.00071
- Wang, Xing, André Bauknecht, Shashank Maurya, and Inderjit Chopra. 2021a. “Slowed Hingeless Rotor Wind Tunnel Tests and Validation at High Advance Ratios.” Journal of Aircraft 58 (1): 153–66. https://doi.org/10.2514/1.c035900
- Wang, Xinhua, and Lilong Cai. 2015. “Mathematical Modeling and Control of a Tilt-Rotor Aircraft.” Aerospace Science and Technology 47: 473–92. https://doi.org/10.1016/j.ast.2015.10.012
- Wang, Luofeng, Renliang Chen, Xin Xie, and Ye Yuan. 2025i. “Modeling and Full-Speed Range Transition Strategy for a Compound Helicopter.” Aerospace Science and Technology 160: 110092. https://doi.org/10.1016/j.ast.2025.110092
- Wang, Chengjiu, Jingru Chen, Xin Zhou, Jinquan Huang, and Feng Lu. 2026c. “A Hybrid TCN–BiLSTM–Attention Framework for Turboshaft Engine Performance Prediction.” Aerospace 13 (9): 810. https://doi.org/10.3390/aerospace13090810
- Wang, Bo, Xuan Gao, Wei Bian, Xi Chen, and Qijun Zhao. 2025e. “An Efficient Method for Rotor Aeroacoustic Calculation Accounting for Rotor Downwash Influence.” Aerospace 12 (12): 1101. https://doi.org/10.3390/aerospace12121101
- Wang, Bo, Zhong-xi Hou, Ya-fei Lu, and Xiong-feng Zhu. 2016. “Hover Performance Estimation and Validation of Battery Powered Vertical Takeoff and Landing Aircraft.” Journal of Central South University 23 (10): 2595–2603. https://doi.org/10.1007/s11771-016-3321-8
- Wang, Zeyang, Jun Huang, Mingxu Yi, and Shaoze Lu. 2022a. “A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase Modulation.” Sensors 22 (24): 9711. https://doi.org/10.3390/s22249711
- Wang, Mengtian, Tai Jin, and Yao Zheng. 2025d. “Dynamic Thrust of the Propeller in Oblique Flows in Continuous Conversion Mode of Tiltrotor.” Advances in Aerodynamics 7 (1): 20. https://doi.org/10.1186/s42774-025-00212-9
- Wang, Zhong, Jinxi Lang, and Yan Li. 2025f. “Envelope Protection for Coaxial Compound Helicopter with Prescribed Performance.” Journal of Guidance, Control, and Dynamics 48 (12): 2908–18. https://doi.org/10.2514/1.g009045
- Wang, Yu, Qihang Li, and Pan Li. 2025g. “Estimation Method for Basic Parameters of High-Speed Vertical Take-Off and Landing Aircraft.” Aerospace 12 (11): 992. https://doi.org/10.3390/aerospace12110992
- Wang, Zixu, Pan Li, Zhenhua Zhu, Renliang Chen, and Junbiao Shen. 2025a. “Control Allocation Design for Equal Control Sensitivity of Tiltrotor Aircraft.” Aerospace Science and Technology 161: 110134. https://doi.org/10.1016/j.ast.2025.110134
- Wang, Shiyi, Yirui Liu, Danling Zhao, Yongxu Chen, Kun Wang, and Guangrong Chen. 2026f. “A Trimodal Tiltrotor UAV with Ground Effect Enhancement: Integrated Design, Adaptive Control, and Multimodal Flight Validation.” Aerospace Science and Technology 179: 113501. https://doi.org/10.1016/j.ast.2026.113501
- Wang, Zhijun, Vanessa Q. Liu Xu, and Roeland De Breuker. 2025j. “Preliminary Aeroelastic Optimization of Electric Aircraft Wings Including Propeller Whirl Flutter Effects.” Aerospace Science and Technology 157: 109813. https://doi.org/10.1016/j.ast.2024.109813
- Wang, Yu, Wenyuan Ma, and Zhaolin Chen. 2024c. “Sensitivity Analysis for Design Parameters of Electric Tilt-Rotor Aircraft.” Aerospace 11 (4): 322. https://doi.org/10.3390/aerospace11040322
- Wang, Yutong, Jiahao Song, Haomiao Xia, and Qinchuan Hou. 2026e. “Numerical Investigation of Aerodynamic Interactions in a Twin-Propeller Compound Helicopter.” Aerospace 13 (8): 749. https://doi.org/10.3390/aerospace13080749
- Wang, Chen, Wenqian Tan, Liguo Sun, and Junkai Jiao. 2024a. “Flying Qualities Based Time-Varying Stability Augmentation System Design for Tiltrotor Conversion Control.” Chinese Journal of Aeronautics 37 (11): 366–85. https://doi.org/10.1016/j.cja.2024.05.002
- Wang, Zexin, Yingxun Wang, Zhihao Cai, Jiang Zhao, Ningjun Liu, and Yanqi Zhao. 2022b. “Unified Accurate Attitude Control for Dual-Tiltrotor UAV with Cyclic Pitch Using Actuator Dynamics Compensated LADRC.” Sensors 22 (4): 1559. https://doi.org/10.3390/s22041559
- Wang, Zhigang, Qiannan Wang, Hongrui Yu, Dengyan Duan, Zhiwei Ding, and Jianbo Li. 2021b. “Trimming Analysis Method of Quad Tilt Rotor Based on Aerodynamic Interference Model.” Journal of Aircraft 58 (2): 253–65. https://doi.org/10.2514/1.c035943
- Wang, Biao, Meng Wu, Chaoying Tang, and Chunsheng Liu. 2020b. “Model Predictive Control Design for Tilt-Rotor Aircraft at Low Speed Flight.” In 2020 IEEE 16th International Conference on Control & Automation (ICCA). IEEE. https://doi.org/10.1109/icca51439.2020.9264481
- Wang, Mingkai, Guotai Xiaoyang, Ruichen He, Shuguang Zhang, and Jintao Ma. 2023b. “Bi-Layer Sizing and Design Optimization Method of Propulsion System for Electric Vertical Takeoff and Landing Aircraft.” Energy 283: 129052. https://doi.org/10.1016/j.energy.2023.129052
- Wang, Xiaobo, Xufei Yan, Xiaojia Han, and Anhuan Xie. 2025b. “Design and Experiment of a Distributed Tiltrotor UAV.” In 2025 WRC Symposium on Advanced Robotics and Automation (WRC SARA). IEEE. https://doi.org/10.1109/wrcsara68202.2025.11195023
- Wang, Yu, Xinrong Zhang, Jun Zhang, and Aijun Li. 2026d. “Integrated VFEGO Planner and Response-Type-Aware Saturated MRAC for Coaxial Compound Helicopter Ship-Landing.” Aerospace Science and Technology 178: 112414. https://doi.org/10.1016/j.ast.2026.112414
- Wang, Ban, Huimin Zhao, Xinyue Hu, Yanyan Shen, and Ni Li. 2026a. “Adaptive Sliding Mode Fault-Tolerant Control of an over-Actuated Hybrid VTOL Fixed-Wing UAV under Transition Flight.” ISA Transactions 169: 263–73. https://doi.org/10.1016/j.isatra.2025.12.046
- Wang, Yong, Qian’gang Zheng, Zhigui Xu, and Haibo Zhang. 2020c. “A Novel Control Method for Turboshaft Engine with Variable Rotor Speed Based on the Ngdot Estimator through LQG/LTR and Rotor Predicted Torque Feedforward.” Chinese Journal of Aeronautics 33 (7): 1867–76. https://doi.org/10.1016/j.cja.2020.01.009
- Wang, Chunyang, Zhou Zhou, and Rui Wang. 2019a. “Research on Dynamic Modeling and Transition Flight Strategy of VTOL UAV.” Applied Sciences 9 (22): 4937. https://doi.org/10.3390/app9224937
- Wang, Ban, Dehai Zhu, Linying Han, Honggang Gao, Zhenghong Gao, and Youmin Zhang. 2023a. “Adaptive Fault-Tolerant Control of a Hybrid Canard Rotor/Wing UAV under Transition Flight Subject to Actuator Faults and Model Uncertainties.” IEEE Transactions on Aerospace and Electronic Systems 59 (4): 4559–74. https://doi.org/10.1109/taes.2023.3243580
- Wei, Mengxuan, Maohang Qiu, Shuai Yang, Xiaoyan Liu, Jeff Taylor, and Dong Cao. 2021. “Development of a Fuel Cell Hybrid Electric Vertical Takeoff and Landing Aircraft Power Train.” In 2021 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE. https://doi.org/10.1109/ecce47101.2021.9595968
- Wen, Jiayu, Yanguo Song, Huanjin Wang, Dong Han, and Changfa Yang. 2023a. “Hybrid Adaptive Control for Tiltrotor Aircraft Flight Control Law Reconfiguration.” Aerospace 10 (12): 1001. https://doi.org/10.3390/aerospace10121001
- Wen, Jiayu, Yanguo Song, Huanjin Wang, Dong Han, and Changfa Yang. 2023b. “Training Sample Pattern Optimization Based on a Swarm Intelligence Algorithm for Tiltrotor Flight Dynamics Model Approximation.” Aerospace 10 (12): 1006. https://doi.org/10.3390/aerospace10121006
- Wendong Gai, Honglun Wang, Tengfei Guo, and Dawei Li. 2011. “Modeling and LPV Flight Control of the Canard Rotor/ Wing Unmanned Aerial Vehicle.” In 2011 2nd International Conference on Artificial Intelligence, Management Science and Electronic Commerce (AIMSEC). IEEE. https://doi.org/10.1109/aimsec.2011.6011121
- Willis, William S. 1981. “Effect of Cross-Shafting on Landing Reliability of V/STOL Aircraft.” Journal of Aircraft 18 (9): 794–95. https://doi.org/10.2514/3.57564
- Winborn, Byron R. 1970. “ADAM III V/STOL Concept.” Journal of Aircraft 7 (2): 175–81. https://doi.org/10.2514/3.44143
- Wright, S. E. 1969. “Sound Radiation from a Lifting Rotor Generated by Asymmetric Disk Loading.” Journal of Sound and Vibration 9 (2): 223–40. https://doi.org/10.1016/0022-460x(69)90029-7
- Wu, Meiliwen, and Ming Chen. 2019. “Nonlinear Modeling and Flight Validation of a Small-Scale Compound Helicopter.” Applied Sciences 9 (6): 1087. https://doi.org/10.3390/app9061087
- Wu, Wei, and Renliang Chen. 2021. “An Improved Online System Identification Method for Tiltrotor Aircraft.” Aerospace Science and Technology 110: 106491. https://doi.org/10.1016/j.ast.2021.106491
- Wu, Chong, Hao Cheng, and Hua Wang. 2026b. “Tilt-Rotor Tricopter with State-Constrained Controller Design.” Drones 10 (2): 109. https://doi.org/10.3390/drones10020109
- Wu, Zhenlong, Can Li, and Yihua Cao. 2019a. “Numerical Simulation of Rotor–Wing Transient Interaction for a Tiltrotor in the Transition Mode.” Mathematics 7 (2): 116. https://doi.org/10.3390/math7020116
- Wu, Linfeng, Huanyu Li, Yingjie Li, and Chunwen Li. 2019b. “Position Tracking Control of Tailsitter VTOL UAV with Bounded Thrust-Vectoring Propulsion System.” IEEE Access 7: 137054–64. https://doi.org/10.1109/access.2019.2942526
- Wu, Zhenlong, Jiahao Ren, Jiajia Niu, et al. 2026a. “Concentration Field Characteristics of Sediments Entrained by Rotor Downwash Flow.” Chinese Journal of Aeronautics: 104121. https://doi.org/10.1016/j.cja.2026.104121
- Wu, Zhiyuan, Yong Wang, Tong Zhou, and Jianmei Shuai. 2021. “Design and Hover Control of a Tilt Tri-Rotor Flying-Wing Aircraft.” In 2021 36th Youth Academic Annual Conference of Chinese Association of Automation (YAC). IEEE. https://doi.org/10.1109/yac53711.2021.9486480
- Xiao, Lingfei, and Yue Zhu. 2012. “Support Vector Machine Generalized Predictive Control for Turboshaft Engine.” In Proceedings of the 10th World Congress on Intelligent Control and Automation. IEEE. https://doi.org/10.1109/wcica.2012.6358257
- Xie, Jiayi, Nanxiang Guan, Ming Zhou, and Zhifeng Xie. 2018. “Study on the Mechanism of the Variable-Speed Rotor Affecting Rotor Aerodynamic Performance.” Applied Sciences 8 (7): 1030. https://doi.org/10.3390/app8071030
- Xing, Rui, Ruoqiao Guan, Fenghua He, and Yu Yao. 2025. “Modeling and Control of a Novel Hybrid Coaxial and Tilt Rotor Aircraft.” In 2025 44th Chinese Control Conference (CCC). IEEE. https://doi.org/10.23919/ccc64809.2025.11178431
- Xu, Feng, Shengyi Liu, Shubo Yang, Yunjie Yang, and Xiangyang Wang. 2027. “Robust Mode Conversion Corridor for STOVL Propulsion System Control Schedule Design.” Aerospace Science and Technology 180: 113625. https://doi.org/10.1016/j.ast.2026.113625
- Xu, Yifan, Qian Zhang, and Zelong Yu. 2020. “An Innovative Control Allocation Framework for a Novel Tiltrotor Aircraft.” IEEE Access 8: 219788–219801. https://doi.org/10.1109/access.2020.3041855
- Xue, Min, and Ella M. Atkins. 2006. “Noise-Minimum Runway-Independent Aircraft Approach Design for Baltimore-Washington International Airport.” Journal of Aircraft 43 (1): 39–51. https://doi.org/10.2514/1.15692
- Yamato, Hiroyuki, Noriaki Okada, and Toshio Bando. 1991. “Flight Test of the Japanese Upper Surface Blowing STOL Experimental Aircraft ASKA.” Journal of Aircraft 28 (10): 630–37. https://doi.org/10.2514/3.46075
- Yamazaki, Kentaro, Mai Bando, and Shinji Hokamoto. 2025. “Tilt-Rotor Aircraft with Arm-Mechanisms to Mitigate Aerodynamic Interference.” In 2025 SICE Festival with Annual Conference (SICE FES). IEEE. https://doi.org/10.23919/sicefes67750.2025.11236688
- Yang, Shu. 2023. “Adaptive Bounding-Based Dynamic Inversion Control of a Coaxial Compound Helicopter.” IEEE Transactions on Aerospace and Electronic Systems 59 (6): 9451–62. https://doi.org/10.1109/taes.2023.3318886
- Yang, Tao, Xi Chen, Xuan Gao, Li Ma, Xiayang Zhang, and Qijun Zhao. 2026b. “Installation Effect of the Rear-Mounted Tails of a Compound Helicopter on Its Propeller Noise.” Aerospace 13 (2): 157. https://doi.org/10.3390/aerospace13020157
- Yang, Yunjie, Jinlai Deng, Wenan Liao, Zhihui Du, Zhidan Liu, and Jihong Zhu. 2024e. “Transition Flight Control of the Distributed Propulsion Tilt-Rotor Aircraft.” In 2024 China Automation Congress (CAC). IEEE. https://doi.org/10.1109/cac63892.2024.10864951
- Yang, Rui, Changping Du, Jiahao Yu, Tianrui Fang, and Zean Du. 2026a. “Corridor-Constrained Incremental TD3 for Nacelle Tilt Scheduling in Quad-Tiltrotor UAV Level Transition.” Aerospace Research Communications 4: 17000. https://doi.org/10.3389/arc.2026.17000
- Yang, Kelong, Dong Han, and Qipeng Shi. 2022c. “Study on the Lift and Propulsive Force Shares to Improve the Flight Performance of a Compound Helicopter.” Chinese Journal of Aeronautics 35 (1): 365–75. https://doi.org/10.1016/j.cja.2021.02.010
- Yang, Pingping, Chao Li, Guangfu Bin, Fengshou Gu, and Haiyan Miao. 2024b. “Effect of Particle Impact on Spatial and Temporal Erosion Characteristics of Turboshaft Engine Compressor.” Wear 558-559: 205578. https://doi.org/10.1016/j.wear.2024.205578
- Yang, Pingping, Chao Li, Guangfu Bin, Haiyan Miao, and Fengshou Gu. 2024c. “Erosion Wear Patterns of Turboshaft Engine Compressor under Different Radial Inlet Distortion Conditions.” Tribology International 198: 109907. https://doi.org/10.1016/j.triboint.2024.109907
- Yang, Hao, and Rafael M. Morales. 2021. “Flight Control Design for a Validated XV-15 Tilt Rotor Model: H ∞ vs Linear Parameter Varying.” In 2021 European Control Conference (ECC). IEEE. https://doi.org/10.23919/ecc54610.2021.9654873
- Yang, Aidi, and Yong Wang. 2017. “A New VTOL Aircraft.” In 2017 36th Chinese Control Conference (CCC). IEEE. https://doi.org/10.23919/chicc.2017.8028346
- Yang, ChaoMin, and PinQi Xia. 2011. “Aeroelastic Stability of Wing/pylon/rotor Coupled System for Tiltrotor Aircraft in Forward Flight.” Science China Technological Sciences 54 (10): 2708–15. https://doi.org/10.1007/s11431-011-4454-5
- Yangping, Deng, and Gao Honggang. 2018. “Transition Flight Control and Test of a New Kind Tilt Prop Box-Wing VTOL UAV.” In 2018 9th International Conference on Mechanical and Aerospace Engineering (ICMAE). IEEE. https://doi.org/10.1109/icmae.2018.8467657
- Yanguo, Song, and Wang Huanjin. 2009. “Design of Flight Control System for a Small Unmanned Tilt Rotor Aircraft.” Chinese Journal of Aeronautics 22 (3): 250–56. https://doi.org/10.1016/s1000-9361(08)60095-3
- Yeo, Hyeonsoo. 2013. “Investigation of UH-60A Rotor Performance and Loads at High Advance Ratios.” Journal of Aircraft 50 (2): 576–89. https://doi.org/10.2514/1.c031958
- Yeo, Hyeonsoo, and Wayne Johnson. 2007. “Aeromechanics Analysis of a Heavy Lift Slowed-Rotor Compound Helicopter.” Journal of Aircraft 44 (2): 501–8. https://doi.org/10.2514/1.23905
- Yeo, Hyeonsoo, and Wayne Johnson. 2009a. “Optimum Design of a Compound Helicopter.” Journal of Aircraft 46 (4): 1210–21. https://doi.org/10.2514/1.40101
- Yeo, Hyeonsoo, and Wayne Johnson. 2009b. “Performance and Design Investigation of Heavy Lift Tilt-Rotor with Aerodynamic Interference Effects.” Journal of Aircraft 46 (4): 1231–39. https://doi.org/10.2514/1.40102
- Yeo, Hyeonsoo, Hao Kang, and Andrew R. Kreshock. 2023. “Unified Modeling of the TiltRotor Aeroelastic Stability Testbed for Proprotor Whirl Flutter.” Journal of Aircraft 60 (3): 857–69. https://doi.org/10.2514/1.c036950
- Yeo, Hyeonsoo, and Andrew R. Kreshock. 2020. “Whirl Flutter Investigation of Hingeless Proprotors.” Journal of Aircraft 57 (4): 586–96. https://doi.org/10.2514/1.c035609
- Yildiz, Abdülkadir, Musa Küçükali, and Seher Eken. 2023. “An Analytical Investigation of Propeller Whirl Flutter.” In 2023 10th International Conference on Recent Advances in Air and Space Technologies (RAST). IEEE. https://doi.org/10.1109/rast57548.2023.10197981
- Yin, Xinfan, Hongxu Ma, Honglei An, Xianmin Peng, Guichuan Zhang, and Bowen Nie. 2023a. “Modeling and Wind Tunnel Test Validation of a Hybrid Compound High-Speed Helicopter.” In 2023 3rd International Conference on Robotics, Automation and Artificial Intelligence (RAAI). IEEE. https://doi.org/10.1109/raai59955.2023.10601283
- Yin, Xinfan, Hongxu Ma, Honglei An, Qing Wei, Liangquan Wang, and Bowen Nie. 2023b. “A Review of Hybrid Compound High-Speed Helicopter and Flight Control Technology.” In 2023 6th International Conference on Mechatronics, Robotics and Automation (ICMRA)(. IEEE. https://doi.org/10.1109/icmra59796.2023.10708131
- Yin, Xinfan, Hongxu Ma, Honglei An, Qing Wei, Liangquan Wang, and Bowen Nie. 2023c. “An Unsteady Rotor Aerodynamics Analytical Model of Hybrid Compound High-Speed Helicopter.” In 2023 5th International Conference on Control and Robotics (ICCR). IEEE. https://doi.org/10.1109/iccr60000.2023.10444885
- Yin, Xinfan, Hongxu Ma, Qing Wei, Pengfei Jiang, Liangquan Wang, and Bowen Nie. 2024. “Attitude Control Law Design Based on LQR for a Compound High-Speed Helicopter.” In 2024 36th Chinese Control and Decision Conference (CCDC). IEEE. https://doi.org/10.1109/ccdc62350.2024.10587914
- Yin, Yanchao, Hongwei Niu, and Xiaobao Liu. 2017. “Adaptive Neural Network Sliding Mode Control for Quad Tilt Rotor Aircraft.” Complexity 2017: 1–13. https://doi.org/10.1155/2017/7104708
- Yokota, Kentaro, Hiroshi Fujimoto, and Hiroshi Kobayashi. 2021. “Observer-Based Angle of Attack Estimation for Tilt-Wing eVTOL Aircraft.” In 2021 IEEE International Conference on Mechatronics (ICM). IEEE. https://doi.org/10.1109/icm46511.2021.9385670
- Yonghua, Fan, and Yang Jun. 2006. “Design of Tiltrotor Flight Control System Using Optical Control.” In 2007 Chinese Control Conference. IEEE. https://doi.org/10.1109/chicc.2006.4347033
- Yoo, Sungyul, and Daniel J. Strash. 1990. “Zonal Approach to V/STOL Aerodynamics.” Journal of Aircraft 27 (10): 866–72. https://doi.org/10.2514/3.45950
- Yoon, S. J., and J. A. Schetz. 1988. “Numerical Navier-Stokes Solutions of High-Speed Propeller Flows.” Journal of Propulsion and Power 4 (4): 291–92. https://doi.org/10.2514/3.23065
- Youngshin Kang, Bumjin Park, Changsun Yoo, Yushin Kim, and Samok Koo. 2008. “Flight Test Results of Automatic Tilt Control for Small Scaled Tilt Rotor Aircraft.” In 2008 International Conference on Control, Automation and Systems. IEEE. https://doi.org/10.1109/iccas.2008.4694527
- Yu, Zhihao, Chunhua Li, Jian Huang, and Yi Cheng. 2025b. “Transient Vibration Loads Characteristics Analysis of Variable Speed Rotor.” Applied Sciences 15 (19): 10493. https://doi.org/10.3390/app151910493
- Yu, Changjie, Jihong Zhu, Jinchun Hu, and Zengqi Sun. 2006. “Experimental Modeling Using Modified Cascade Correlation RBF Networks for a Four DOF Tilt Rotor Aircraft Platform.” Neurocomputing 69 (13–15): 1802–5. https://doi.org/10.1016/j.neucom.2005.09.012
- Yuan, Ye, Douglas Thomson, and David Anderson. 2020a. “Application of Automatic Differentiation for Tilt-Rotor Aircraft Flight Dynamics Analysis.” Journal of Aircraft 57 (5): 985–90. https://doi.org/10.2514/1.c035811
- Yuan, Ye, Douglas Thomson, and David Anderson. 2022a. “Aerodynamic Uncertainty Quantification for Tiltrotor Aircraft.” Aerospace 9 (5): 271. https://doi.org/10.3390/aerospace9050271
- Yuan, Ye, Douglas Thomson, and David Anderson. 2022b. “Faster-than-Realtime Inverse Simulation Method for Tiltrotor Handling Qualities Investigation.” Aerospace Science and Technology 124: 107516. https://doi.org/10.1016/j.ast.2022.107516
- Yuan, Baokun, and Bin Xian. 2025. “Nonlinear Control of a Tilt-Rotor Aircraft Based on Super Twisting Control and Online RBF Neural Networks.” In 2025 44th Chinese Control Conference (CCC). IEEE. https://doi.org/10.23919/ccc64809.2025.11179556
- Yue, Haifeng, Zeming Gao, Penghui Liu, et al. 2026. “Transition Planning and Control Methods for a Tilt-Wing VTOL UAV: From Hardware Design to Flight Validation.” Aerospace Science and Technology 168: 111265. https://doi.org/10.1016/j.ast.2025.111265
- Yue, HaiLong, and PinQi Xia. 2009. “A Wake Bending Unsteady Dynamic Inflow Model of Tiltrotor in Conversion Flight of Tiltrotor Aircraft.” Science in China Series E: Technological Sciences 52 (11): 3188–97. https://doi.org/10.1007/s11431-009-0188-z
- Yue, Haifeng, Sheng Zhang, Penghui Liu, et al. 2025. “A Real-Time Aerodynamics Prediction Method for the Tilt-Wing VTOL Aircraft Based on Deep Learning.” In 2025 16th International Conference on Mechanical and Aerospace Engineering (ICMAE). IEEE. https://doi.org/10.1109/icmae66341.2025.11276936
- Yuksek, B., A. Vuruskan, U. Ozdemir, M. A. Yukselen, and G. Inalhan. 2016. “Transition Flight Modeling of a Fixed-Wing VTOL UAV.” Journal of Intelligent & Robotic Systems 84 (1–4): 83–105. https://doi.org/10.1007/s10846-015-0325-9
- Zaludin, Zairil, and Ezanee Gires. 2019. “Automatic Flight Control Requirements for Transition Flight Phases When Converting Long Endurance Fixed Wing UAV to VTOL Aircraft.” In 2019 IEEE International Conference on Automatic Control and Intelligent Systems (I2CACIS). IEEE. https://doi.org/10.1109/i2cacis.2019.8825042
- Zanoni, Andrea, Giacomo Gerosa, Luigi Di Lallo, and Pierangelo Masarati. 2022. “Handling Qualities in Rotorcraft Conceptual Design.” Aerotecnica Missili & Spazio 101 (1): 95–108. https://doi.org/10.1007/s42496-022-00107-8
- Zeng, Lifang, Jianxin Hu, Dingyi Pan, and Xueming Shao. 2020. “Automated Design Optimization of a Mono Tiltrotor in Hovering and Cruising States.” Energies 13 (5): 1155. https://doi.org/10.3390/en13051155
- Zhang, Chengyu, and Volker Gümmer. 2020. “Multi-Objective Optimization and System Evaluation of Recuperated Helicopter Turboshaft Engines.” Energy 191: 116477. https://doi.org/10.1016/j.energy.2019.116477
- Zhang, Xinglong, Lingwei Li, and Tianhong Zhang. 2021. “Research on Real-Time Model of Turboshaft Engine with Surge Process.” In 2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing). IEEE. https://doi.org/10.1109/phm-nanjing52125.2021.9612904
- Zhang, Xinglong, Lingwei Li, and Tianhong Zhang. 2022b. “Research on Real-Time Model of Turboshaft Engine with Surge Process.” Applied Sciences 12 (2): 744. https://doi.org/10.3390/app12020744
- Zhang, Shuo, Aotian Ma, Teng Zhang, Ning Ge, and Xing Huang. 2024b. “A Performance Simulation Methodology for a Whole Turboshaft Engine Based on Throughflow Modelling.” Energies 17 (2): 494. https://doi.org/10.3390/en17020494
- Zhang, Xinran, and Guoyuan Qi. 2024. “Application of Additive-State-Decomposition-Based Model-Compensation Controller in Compound Vertical Takeoff and Landing Unmanned Aircraft.” In 2024 IEEE 13th Data Driven Control and Learning Systems Conference (DDCLS). IEEE. https://doi.org/10.1109/ddcls61622.2024.10606784
- Zhang, Jing, Liguo Sun, Xiangju Qu, and Liuping Wang. 2018b. “Time-Varying Linear Control for Tiltrotor Aircraft.” Chinese Journal of Aeronautics 31 (4): 632–42. https://doi.org/10.1016/j.cja.2018.01.025
- Zhang, Huanhuan, Xiangyang Wang, and Zhidan Liu. 2025a. “Design of Monitoring and Control Software Used for the Loop Simulation of VTOL Aircraft Propulsion System Model.” In 2025 44th Chinese Control Conference (CCC). IEEE. https://doi.org/10.23919/ccc64809.2025.11179362
- Zhang, Xiang, Weiqing Xu, Yan Shi, Maolin Cai, and Fengyun Li. 2017. “Study on the Effect of Tilting-Rotor Structure on the Lift of Small Tilt Rotor Aircraft.” In 2017 2nd International Conference on Advanced Robotics and Mechatronics (ICARM). IEEE. https://doi.org/10.1109/icarm.2017.8273192
- Zhang, Zhiqi, Mo Zhai, Shuaichen Chen, and Shouzhao Sheng. 2023b. “Research on Rotor Speed Optimization Strategy of TiltRotor Aircraft Based on IPSO-SQP Algorithm.” In 2023 International Conference on Computer Science and Automation Technology (CSAT). IEEE. https://doi.org/10.1109/csat61646.2023.00150
- Zhang, Zhengang, Huan Zhao, Shekun Wang, Kaiyuan Fan, and Zhenghong Gao. 2026b. “Multipoint Inverse Design Method for an Integrated Tail-Propulsive Propeller in Canard Rotor-Wing UAV.” IEEE Transactions on Aerospace and Electronic Systems 62: 10427–45. https://doi.org/10.1109/taes.2026.3689077
- Zhao, Guoqing, Zhuangzhuang Cui, Qijun Zhao, Xi Chen, and Peng Li. 2024a. “Investigations on Trimming Strategy and Unsteady Aerodynamic Characteristics of Tiltrotor in Conversion Procedure.” Aerospace 11 (8): 632. https://doi.org/10.3390/aerospace11080632
- Zhao, Yiyuan, Ali A. Jhemi, and Robert T. N. Chen. 1996. “Optimal Vertical Takeoff and Landing Helicopter Operation in One Engine Failure.” Journal of Aircraft 33 (2): 337–46. https://doi.org/10.2514/3.46943
- Zhao, Yanqin, Peilin Liu, and Xufei Yan. 2026a. “Adaptive Model-Informed Controller for Tiltrotor Aircraft.” Journal of Aircraft 63 (4): 1705–15. https://doi.org/10.2514/1.c038591
- Zhao, Huimin, Ban Wang, Yifang Fu, Mengqi Zhou, Ni Li, and Zhenghong Gao. 2026b. “Fixed-Time Adaptive Smooth Control with Relaxed Performance Constraints for a Canard Rotor/wing UAV Subject to Aerodynamic Interferences and Actuator Faults.” Aerospace Science and Technology 178: 112959. https://doi.org/10.1016/j.ast.2026.112959
- Zhao, Huimin, Ban Wang, Yanyan Shen, Yinong Zhang, Ni Li, and Zhenghong Gao. 2023a. “Development of Multimode Flight Transition Strategy for Tilt-Rotor VTOL UAVs.” Drones 7 (9): 580. https://doi.org/10.3390/drones7090580
- Zhao, Jiang, Yue Wu, Yuyan Zhang, et al. 2025b. “Research on Dynamic Characteristics of Coaxial Compound High Speed Helicopter Transmission System.” Mechanics Based Design of Structures and Machines 54 (1): 2539329. https://doi.org/10.1080/15397734.2025.2539329
- Zhao, Ming, Zhixiang Xiao, and Song Fu. 2014. “Predictions of Transition on a Hovering Tilt-Rotor Blade.” Journal of Aircraft 51 (6): 1904–13. https://doi.org/10.2514/1.c032570
- Zhao, Yanqin, Ye Yuan, and Renliang Chen. 2023b. “Influence of Differential Longitudinal Cyclic Pitch on Flight Dynamics of Coaxial Compound Helicopter.” Chinese Journal of Aeronautics 36 (9): 207–20. https://doi.org/10.1016/j.cja.2023.06.002
- Zhao, Yanqin, Ye Yuan, and Renliang Chen. 2023e. “Takeoff Optimisation of Coaxial Compound Helicopter with Uncertainty Quantification.” Optimization and Engineering 25 (2): 999–1024. https://doi.org/10.1007/s11081-023-09832-w
- Zhao, Qingfeng, Zhou Zhou, and Zhilin Zhang. 2023c. “Modeling and Dynamic Stability Analysis of Distributed Electric Propulsion Tilt-Rotor UAV.” Journal of Aircraft 60 (6): 1889–1900. https://doi.org/10.2514/1.c037208
- Zhen Pan, Weihong Wang, Siyang Song, and Ke Lu. 2016. “Nonlinear Attitude Control of Tiltrotor Aircraft Based on Active Disturbance Rejection Sliding Mode Method.” In 2016 IEEE Chinese Guidance, Navigation and Control Conference (CGNCC). IEEE. https://doi.org/10.1109/cgncc.2016.7828985
- Zheng, Ruijian, Feng Gu, Zhong Liu, Hao Zhou, and Yuqing He. 2020a. “Controller Design and Flight Experiments for the Dual Tilt Rotor Unmanned Aerial Vehicle in Helicopter Mode.” In 2020 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE. https://doi.org/10.1109/icuas48674.2020.9213944
- Zheng, Fengying, Longwu Liu, Zhiming Chen, Yuehua Chen, and Fengna Cheng. 2020b. “Hybrid Multi-Objective Control Allocation Strategy for Compound High-Speed Rotorcraft.” ISA Transactions 98: 207–26. https://doi.org/10.1016/j.isatra.2019.08.039
- Zheng, Fengying, Bowei Xiong, Jingyang Zhang, Ziyang Zhen, and Feng Wang. 2022. “Improved Neural Network Adaptive Control for Compound Helicopter with Uncertain Cross-Coupling in Multimodal Maneuver.” Nonlinear Dynamics 108 (4): 3505–28. https://doi.org/10.1007/s11071-022-07382-x
- Zheng, Qiangang, Zhigui Xu, Haibo Zhang, and Zhengchen Zhu. 2018. “A Turboshaft Engine NMPC Scheme for Helicopter Autorotation Recovery Maneuver.” Aerospace Science and Technology 76: 421–32. https://doi.org/10.1016/j.ast.2018.01.034
- Zhong Chen, Changjie Yu, and Jianwen Yang. 2005. “Dynamic Modeling Using Cascade-Correlation RBF Networks for Tilt Rotor Aircraft Platform.” In 2005 International Conference on Neural Networks and Brain, vol. 1. IEEE. https://doi.org/10.1109/icnnb.2005.1614561
- Zhou, Pan, Renliang Chen, Ye Yuan, and Cheng Chi. 2022. “Aerodynamic Interference on Trim Characteristics of Quad-Tiltrotor Aircraft.” Aerospace 9 (5): 262. https://doi.org/10.3390/aerospace9050262
- Zhou, Yang, Guoping Huang, and Chen Xia. 2020. “Analysis of Fixed-Wing VTOL Aircraft with Gas-Driven Fan Propulsion System.” Aerospace Science and Technology 104: 105984. https://doi.org/10.1016/j.ast.2020.105984
- Zhou, Mengqi, Ban Wang, Huimin Zhao, and Yifang Fu. 2025. “Adaptive Transition Flight Control for a Multi-Mode VTOL UAV with Model Uncertainties and Actuator Faults.” IFAC-PapersOnLine 59 (20): 500–505. https://doi.org/10.1016/j.ifacol.2025.11.200
- Zhu, He, Yuhao Du, Hong Nie, Zhiyang Xin, and Xi Geng. 2025c. “Experimental Investigation of Aerodynamic Interaction in Non-Parallel Tandem Dual-Rotor Systems for Tiltrotor UAV.” Drones 9 (5): 374. https://doi.org/10.3390/drones9050374
- Zhu, Xue Ping, Yong Hua Fan, and Jun Yang. 2010. “Design of Tiltrotor Flight Control System Using Fuzzy Sliding Mode Control.” In 2010 International Conference on Measuring Technology and Mechatronics Automation. IEEE. https://doi.org/10.1109/icmtma.2010.211
- Zhu, Yuanzhao, Guoping Huang, Chen Xia, and Yang Wu. 2025a. “Aerodynamic Design of Fixed-Wing VTOL Aircraft Powered by Gas-Driven Fan Propulsion System.” Aerospace Science and Technology 162: 110165. https://doi.org/10.1016/j.ast.2025.110165
- Zhu, Jiahao, Yongjie Shi, Taihang Ma, Guohua Xu, and Zhiyuan Hu. 2025b. “Effect of Dynamic Tilting Speed on the Flow Field of Distributed Multi-Propeller Tilt-Wing Aircraft during Transition Flight.” Machines 13 (12): 1130. https://doi.org/10.3390/machines13121130
- Zhu, Yingtao, Bingjie Zhu, Xixiang Yang, Zhongxi Hou, and Jianan Zong. 2022. “Fuzzy Logic-Based Energy Management Strategy of Hybrid Electric Propulsion System for Fixed-Wing VTOL Aircraft.” Aerospace 9 (10): 547. https://doi.org/10.3390/aerospace9100547
- Zong, Jianan, Bingjie Zhu, Zhongxi Hou, Xixiang Yang, and Jiaqi Zhai. 2021. “Evaluation and Comparison of Hybrid Wing VTOL UAV with Four Different Electric Propulsion Systems.” Aerospace 8 (9): 256. https://doi.org/10.3390/aerospace8090256
- Zong, Jianan, Bingjie Zhu, Zhongxi Hou, Xixiang Yang, and Jiaqi Zhai. 2022. “Sizing and Mission Profile Analysis of the Hybrid-Electric Propulsion System for Retrofitting a Fixed Wing VTOL Aircraft.” International Journal of Aerospace Engineering 2022: 1–10. https://doi.org/10.1155/2022/9384931
- Zou, Yiru, Chunsheng Liu, and Ke Lu. 2021. “Robust Smooth Transfer for Tilt-Rotor Aircraft under the Asynchronous Switching.” Journal of the Franklin Institute 358 (18): 9698–9720. https://doi.org/10.1016/j.jfranklin.2021.10.016
- ““Convertiplane” — A Dual-Purpose Aircraft.” 1959. Electrical Engineering 78 (9): 974–75. https://doi.org/10.1109/ee.1959.6445949
Primary Sources, Non-Peer-Reviewed
- \xd6ttl, Christoph, and Reinhard Willinger. 2021. “Thermodynamic and Mechanical Design Concept for Micro-Turbojet to Micro-Turboshaft Engine Conversion.” Preprint, . https://doi.org/10.1115/1.0002756v
- A-21 Aircraft Noise Measurement Aviation Emission Modeling. n.d. Helicopter and V/STOL Aircraft Noise Measurement Problems. SAE International. https://doi.org/10.4271/air1286
- Aaron, Ridley, J. J. Gutierrez, and E. R. Wood. 2003. “JSF Lift-Fan Approach for Design of a STOVL Heavy Lift Transport for Expeditionary Warfare.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f59-8111
- Abbott, William Y., John O. Benson, Randall G. Oliver, and Robert A. Williams. 1982. Validation Flight Test of UH-60A for Rotorcraft Systems Integration Simulator (RSIS). Defense Technical Information Center. https://doi.org/10.21236/ada125428
- Abdalla, K. L., J. G. McArdle, and H. Lindsay. 1988. Convertible Gas-Turbine Engines. LEW-14597. NASA Lewis Research Center, Cleveland, OH. https://ntrs.nasa.gov/citations/19880000542
- Abdullah, Masuk, and Géza Husi. 2026. “Engineering Approaches to Sustainable Supersonic VTOL Aircraft Using Lift Fan Technology and Future Prospects.” Periodica Polytechnica Transportation Engineering. https://doi.org/10.3311/pptr.38000
- Abdullayev, Bakhodur Shukhratuly. 2024. “Analysis of Aerodynamic Characteristics of Various Types of Vertical Takeoff Passenger Aircraft.” In ICSP «NEW SCIENCE» eBooks. https://doi.org/10.46916/22042024-4-978-5-00215-359-6
- Abras, Jennifer, and Nathan S. Hariharan. 2015. “Comparison of CFD Hover Predictions on the S-76 Rotor.” In 53rd AIAA Aerospace Sciences Meeting. AIAA 2015-1711. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1711
- Abras, Jennifer N., and Robert P. Narducci. 2010. “Analysis of CFD Modeling Techniques over the MV-22 Tiltrotor.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f66-000037
- Abrego, Anita I., Mark D. Betzina, and Kurtis R. Long. 2002. A Small-Scale Tiltrotor Model Operating in Descending Flight. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20030063074
- Acree, Cecil W. 1982. Performance of the Rotor Systems Research Aircraft Calibrated Rotor Loads Measurement System. https://doi.org/10.4050/vfs-f38-044
- Acree, Cecil W. 1984. “Performance of the Rotor Systems Research Aircraft Calibrated Rotor-Load-Measurement System.” Journal of the American Helicopter Society 29 (3): 65–72. https://doi.org/10.4050/jahs.29.65
- Acree, Cecil W. 2005b. “Effects of V-22 Blade Modifications on Whirl Flutter and Loads.” Journal of the American Helicopter Society 50 (3): 269. https://doi.org/10.4050/1.3092863
- Acree, Cecil W. 2006b. “Impact of Technology on Heavy Lift Tiltrotors.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f62-009
- Acree, Cecil W. 2008. Modeling Requirements for Analysis and Optimization of JVX Proprotor Performance. https://doi.org/10.4050/vfs-f64-000103
- Acree, C. W. 2014. “Aerodynamic Limits on Large Civil Tiltrotor Sizing and Efficiency.” In Decennial AHS Aeromechanics Specialists’’ Conference. https://ntrs.nasa.gov/citations/20140008651
- Acree, C. W. 2020. “Vertical Climb Testing of a Full-Scale Proprotor on the Tiltrotor Test Rig.” In Transformative Vertical Flight 2020. https://ntrs.nasa.gov/citations/20200000510
- Acree, C. W. 2026b. Wind Tunnel Performance Tests of a Full-Scale Proprotor on the Tiltrotor Test Rig Addendum: Numerical Data. National Aeronautics and Space Administration. https://doi.org/10.64631/fkmg9147
- Acree, Cecil W., Richard J. Peyran, and Wayne R. Johnson. 2001a. “Rotor Design Options for Improving Tiltrotor Whirl-Flutter Stability Margins.” Journal of the American Helicopter Society 46 (2): 87–95. https://doi.org/10.4050/jahs.46.87
- Acree, C. W., Jr. 1993. An Improved CAMRAD Model for Aeroelastic Stability Analysis of the XV-15 with Advanced Technology Blades. NASA-TM-4448. NASA. https://ntrs.nasa.gov/citations/19930013297
- Acree, C. W., Jr. 2000. Effects of Rotor Design Variations on Tiltrotor Whirl-Mode Stability. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20030062967
- Acree, C. W., Jr. 2003. Effects of Blade Sweep on V-22 Whirl Flutter and Loads. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20040008886
- Acree, C. W., Jr. 2004. Effects of V-22 Blade Modifications on Whirl Flutter and Loads. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20040077374
- Acree, C. W., Jr. 2005a. Effects of Swept Tips on V-22 Whirl Flutter and Loads. NASA/TM-2005-213458. NASA. https://ntrs.nasa.gov/citations/20060051636
- Acree, C. W., Jr. 2006a. Impact of Aerodynamics and Structures Technology on Heavy Lift Tiltrotors. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20070017952
- Acree, C. W., Jr. 2010. “Integration of Rotor Aerodynamic Optimization with the Conceptual Design of a Large Civil Tiltrotor.” In AHS Aeromechanics Specialists Conference 2010. https://ntrs.nasa.gov/citations/20100036641
- Acree, C. W., Jr. 2016. Assessment of JVX Proprotor Performance Data in Hover and Airplane-Mode Flight Conditions. NASA/TM-2016-219070. NASA. https://ntrs.nasa.gov/citations/20160004035
- Acree, C. W., Jr. 2022. Vertical Climb Testing of the Model 699 Proprotor on the Tiltrotor Test Rig. NASA/TM-20210021872. NASA. https://ntrs.nasa.gov/citations/20210021872
- Acree, C. W., Jr. 2024. Tiltrotor Test Rig Wind-Tunnel Test Data Catalog. NASA/TM-20240008170. NASA. https://ntrs.nasa.gov/citations/20240008170
- Acree, C. W., Jr. 2026a. Vertical Climb Testing of the Model 699 Proprotor on the Tiltrotor Test Rig Addendum: Numerical Data. National Aeronautics and Space Administration. https://doi.org/10.64631/wfqq5012
- Acree, C. W., Jr., and Krishna Hoffman. 2004. “Whirl Flutter Studies for a SSTOL Transport Demonstrator.” In American Helicopter Society 4th Decennial Specialist’’s Conference on Aeromechanics. https://ntrs.nasa.gov/citations/20050009924
- Acree, Cecil W., Jr., and Wayne Johnson. 2006. “Performance, Loads and Stability of Heavy Lift Tiltrotors.” In AHS Vertical Lift Aircraft Design Conference. https://ntrs.nasa.gov/citations/20060013409
- Acree, C. W., Jr., Wayne Johnson, and R. J. Peyran. 1999. “Rotor Design for Whirl Flutter: An Examination of Options for Improving Tiltrotor Aeroelastic Stability Margins.” In Proceedings of the Vertical Flight Society Forum 55 - Montreal, Canada 1999. The Vertical Flight Society. https://doi.org/10.4050/vfs-f55-00137
- Acree, C. W., Jr., R. J. Peyran, and Wayne Johnson. 2004. Rotor Design Options for Improving XV-15 Whirl-Flutter Stability Margins. NASA/TP-2004-212262. NASA. https://ntrs.nasa.gov/citations/20040081235
- Acree, C. W., Jr., R. J. Peyran, Wayne Johnson, and Edwin W. Aiken. 2000. Improving Tiltrotor Whirl-Mode Stability with Rotor Design Variations. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20000114842
- Acree, C. W., Jr., George Price, and Michael Rutkowski. 2001b. Rotor Design Options for Improving V-22 Whirl-Mode Stability. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20020038574
- Acree, C. W., Jr., and Michael Rutkowski. 2001. Effects of Rotor Design Variations on Tiltrotor Whirl-Mode Stability. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20010114155
- Acree, C. W., Jr., and A. L. Sheikman. 2018. “Development and Initial Testing of the Tiltrotor Test Rig.” In AHS (American Helicopter Society) Annual Forum and Technology Display. https://ntrs.nasa.gov/citations/20180002964
- Acree, C. W., Jr., A. L. Sheikman, and T. R. Norman. 2022. Wind Tunnel Performance Tests of a Full-Scale Proprotor on the Tiltrotor Test Rig. NASA/TM-20210021871. NASA. https://ntrs.nasa.gov/citations/20210021871
- Acree, C. W., Jr., and Mark B. Tischler. 1987. Using Frequency-Domain Methods to Identify XV-15 Aeroelastic Modes. NASA-TM-100033. NASA. https://ntrs.nasa.gov/citations/19880008262
- Acree, C. W., Jr., and Mark B. Tischler. 1988. “Using Frequency-Domain Methods to Identify XV-15 Aeroelastic Modes.” In International Powered Lift Conference and Exposition. https://ntrs.nasa.gov/citations/19880050007
- Acree, C. W., Jr., and Mark B. Tischler. 1989b. “Identification of XV-15 Aeroelastic Modes Using Frequency-Domain Methods.” Vertica 13 (1, 19). https://ntrs.nasa.gov/citations/19890053721
- Acree, C. W., Jr., and Mark B. Tischler. 1993. Determining XV-15 Aeroelastic Modes from Flight Data with Frequency-Domain Methods. NASA-TP-3330. NASA. https://ntrs.nasa.gov/citations/19940006463
- Adamczyk, J. J., M. L. Celestina, and Jen Ping Chen. 1994. “Wake-Induced Unsteady Flows: Their Impact on Rotor Performance and Wake Rectification.” In Volume 1: Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/94-gt-219
- Adamczyk, J. J., M. L. Celestina, and Jen Ping Chen. 1996. “Wake-Induced Unsteady Flows: Their Impact on Rotor Performance and Wake Rectification.” Journal of Turbomachinery 118 (1): 88–95. https://doi.org/10.1115/1.2836611
- Adebimpe, Saheed. 2023. “Enhancing Urban Air Mobility Integration in Cargo Transportation through Tiltrotor Technology.” Preprint, . https://doi.org/10.31224/3275
- Adelt, W. H. 1981. “Type ‘A’ V/STOL: One Aircraft for All Support Missions.” In V/STOL Conference. https://ntrs.nasa.gov/citations/19820033382
- ADS-33E-PRF, Handling Qualities Requirements for Military Rotorcraft, and 21 March. 2000. Aeronautical Design Standard Performance Specification: Handling Qualities Requirements for Military Rotorcraft. ADS-33E-PRF. U.S. Army. https://everyspec.com/ARMY/ADS-Aero-Design-Std/ADS-33E-PRF_31MAR2000_3614/
- Advancement of Proprotor Technology. Task 1: Design Study Summary. 1969. NASA-CR-114682. NASA. https://ntrs.nasa.gov/citations/19740003720
- Advancement of Proprotor Technology. Task 2: Wind-Tunnel Test Results. 1971. NASA-CR-114363. NASA. https://ntrs.nasa.gov/citations/19740003721
- “Aerodynamic Interaction Study of the Rotor/wing Ensemble in Different Flow Configurations.” 1994. In 12th Applied Aerodynamics Conference. AIAA 1994-1921. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1994-1921
- Aerospace, Dufour, Dufour Aerospace, Dufour Aerospace, et al. 2025a. “Design and Development of an Automated Flight Control System for Tilt-Wing Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0059
- Aerospace, Dufour, Sebastian Schmid, Dufour Aerospace, et al. 2025b. “Modeling, Simulation and System Identification of a Tilt-Wing Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0295
- Ahmed, Muhammad Tanvir, Ziad Bin Abdul Awal, Eipshita Sardar, and Moustafa Amir Faisal. 2026. “Rudimentary Design Analysis of a Conceptual Unmanned Tandem Tilt Rotor Aircraft.” In AIP Conference Proceedings, vol. 3488. AIP Publishing. https://doi.org/10.1063/5.0328249
- Ahn, Chihyun, WonSeok Cha, SunHoo Park, ByeongUk Im, TaeYoung Chun, and SangJoon Shin. 2024. “Physics-Based Airframe Design Approach Expanded from the Conceptual Design of Coaxial Rotorcraft.” International Journal of Aeronautical and Space Sciences 26 (2): 847–61. https://doi.org/10.1007/s42405-024-00758-w
- Aiken, T. N. 1977. Thrust Augmentor Application for STOL and V/STOL. NASA-TM-X-73241. NASA. https://ntrs.nasa.gov/citations/19770017154
- Aiken, E. W., J. L. Beilman, J. V. Lebacqz, and J. W. Clark Jr. 1977. “Capabilities of the Navy Variable Stability X-22A for V/STOL Flying Qualities R and D.” In Naval Postgraduate School Proc. of the Navy(NASA VSTOL Flying Qualities. https://ntrs.nasa.gov/citations/19780011162
- Aiken, Edwin, Robert Jacobsen, Michelle Eshow, William Hindson, and Douglas Doane. 1992. “Preliminary Design Features of the RASCAL: A NASA/Army Rotorcraft in-Flight Simulator.” In Flight Simulation Technologies Conference. AIAA 1992-4175. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-4175
- Aircraft Certification Unit. 2020. Type Acceptance Report: GENERAL ELECTRIC CT7 Series. TAR 20/21B/3. Civil Aviation Authority of New Zealand. https://www.aviation.govt.nz/assets/aircraft/type-acceptance-reports/General-Electric-CT7-Series.pdf
- Ajaj, Zahraa Fadhil, Ahmed Hameed Reja, and Ahmed Adnan Shandookh. 2025. “Design and Construct a New Model of E-VTOL RC Aircraft Using 3D-Printer.” In AIP Conference Proceedings, vol. 3350. AIP Publishing. https://doi.org/10.1063/5.0298698
- Akinwale, Akinola, and Anubhav Datta. 2023. “High Speed Whirl Flutter Tests of the Maryland Tiltrotor Rig.” In Proceedings of the Vertical Flight Society 79th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0079-2023-18035
- Akinwale, Akinola, and Anubhav Datta. 2025a. “The Effect of Pylon Center of Gravity on Tiltrotor Whirl-Flutter.” In AIAA SCITECH 2025 Forum. AIAA 2025-0429. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-0429
- AL-Taie, Arkan k., and Usama S. Salah. 2009. “Modeling of a Miso Control System for a Turboshaft Engine.” Engineering and Technology Journal 27 (1): 159–71. https://doi.org/10.30684/etj.27.1.12
- Alam, Mushfiqul, Sergej Celikovsky, and Daniel Walker. 2016. “Robust Hover Mode Control of a Tiltrotor Using Nonlinear Control Technique.” In AIAA Guidance, Navigation, and Control Conference. AIAA 2016-0359. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-0359
- Albers, James A., and John Zuk. 1987a. “Civil Applications of High Speed Rotorcraft and Powered Lift Aircraft Configurations.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/872372
- Albers, James A., and John Zuk. 1987b. V/STOL Aircraft Configurations and Opportunities in the Pacific Basin. NASA-TM-100005. NASA. https://ntrs.nasa.gov/citations/19880002262
- Albers, James A., and John Zuk. 1988a. “Civil Applications of High Speed Rotorcraft and Powered Lift Aircraft Configurations.” In International Powered Lift Conference and Exposition. https://ntrs.nasa.gov/citations/19880049999
- Albers, James A., and John Zuk. 1988b. “V/STOL Aircraft Configurations and Opportunities in the Pacific Basin.” In SAE. https://ntrs.nasa.gov/citations/19890023260
- Albers, James A., and John Zuk. 1990. Civil Applications for New V/STOL and STOL Aircraft. ARC-12175. NASA Ames Research Center, Moffett Field, CA. https://ntrs.nasa.gov/citations/19900000484
- Albers, James A., and John Zuk. 1992. Future V/STOL Aircraft for the Pacific Basin. ARC-12177. NASA Ames Research Center, Moffett Field, CA. https://ntrs.nasa.gov/citations/19920000320
- Albuck, Nathaniel, Tanmay Mathur, and Ahmad Haidar. 2023. “Development of a Coupled Torsional Dynamics and Gear Contact Model to Predict Peak Loads in a Tiltrotor Drive System.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18140
- Alexander, Harold R., Lois M. Hengen, and James A. Weiberg. 1974. “Aeroelastic-Stability Characteristics of a V/STOL Tilt-Rotor Aircraft with Hingeless Blades: Correlation of Analysis and Test.” In Proceedings of the Vertical Flight Society Forum 30 - Washington, D.C. 1974. The Vertical Flight Society. https://doi.org/10.4050/vfs-f30-022
- Alexander, Harold R., Martin D. Maisel, and Demo J. Giulianetti. 1986. “The Development of Advanced Technology Blades for Tilt-Rotor Aircraft.” Vertica 10 (3-4,). https://ntrs.nasa.gov/citations/19870037753
- Alexander, H. R., K. E. Smith, M. A. McVeigh, P. G. Dixon, and B. L. McManus. 1979. Preliminary Design Study of Advanced Composite Blade and Hub and Nonmechanical Control System for the Tilt-Rotor Aircraft. Volume 1: Engineering Studies. NASA-CR-152336-1. NASA. https://ntrs.nasa.gov/citations/19810014531
- Alford, W. J., Jr., and R. V. Harris Jr. 1966. Cruise Performance and Stability Considerations for Jet V/STOL Aircraft. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19660015328
- Alford, W. J., Jr., R. E. Kuhn, and J. P. Reeder. 1963. Jet V/STOL Tactical Aircraft. NASA. https://ntrs.nasa.gov/citations/19630021498
- Alford, W. J., Jr., and A. A. Luoma. 1960. Performance, Stability, and Control Characteristics at Transonic Speeds of Three V/STOL Airplane Configurations with Wings of Variable Sweep. NASA-TM-X-321. NASA. https://ntrs.nasa.gov/citations/19660020171
- Alfred, Jillian, Roberto Celi, and J. Gordon Leishman. 2013. “Rotorcraft Brownout Mitigation through Flight Path Optimization Using a High Fidelity Rotorcraft Simulation Model.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-0256
- Ali, Fakhre, Roberto d’Ippolito, Konstantinos Tzanidakis, Ioannis Goulos, and Vassilios Pachidis. 2015a. “Multi-Objective Optimization of a Regenerative Rotorcraft Powerplant: Quantification of Overall Engine Weight and Fuel Economy.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10239
- Ali, Jaffar Syed Mohamed, Hamdi Kamaruddin, and Abdul Aabid. 2024. “Study on the Propeller Characteristics of a Vertical Takeoff and Landing Aircraft.” Journal of Advanced Research in Applied Mechanics 129 (1): 12–23. https://doi.org/10.37934/aram.129.1.1223
- Ali, Fakhre, Konstantinos Tzanidakis, Ioannis Goulos, Vassilios Pachidis, and Roberto d’Ippolito. 2015b. “Multi-Objective Optimization of a Regenerative Rotorcraft Powerplant: Trade-off between Overall Engine Weight and Fuel Economy.” Journal of Engineering for Gas Turbines and Power 137 (12): 121201. https://doi.org/10.1115/1.4030634
- Aljabri, A. 1983. “Aerodynamic Design of Propfan Powered Transports.” In 19th Joint Propulsion Conference. AIAA 1983-1213. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-1213
- Aljabri, Abdullah. 1987. “Wind Tunnel Tests on a One-Foot Diameter SR-7L Propfan Model.” In 23rd Joint Propulsion Conference. AIAA 1987-1892. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-1892
- Allan, Brian G., Luther N. Jenkins, Chung-Sheng Yao, et al. 2009. Navier-Stokes Simulation of a Heavy Lift Slowed-Rotor Compound Helicopter Configuration. https://doi.org/10.4050/vfs-f65-1
- Allen, Christian. 2004. “Multi-Bladed Lifting Rotor Simulation in Hover, Forward Flight, and Ground Effect.” In 22nd Applied Aerodynamics Conference and Exhibit. AIAA 2004-5288. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2004-5288
- Allen, C. B. 2006. “Parallel Simulation of Lifting Rotor Wakes.” In Parallel Computational Fluid Dynamics 2005. Elsevier. https://doi.org/10.1016/b978-044452206-1/50002-1
- Alli, Pietro. 2003. “Erica: The European Tiltrotor. Design and Critical Technology Projects.” In AIAA International Air and Space Symposium and Exposition: The Next 100 Years. AIAA 2003-2515. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-2515
- Altman, Lk, Dj Reddy, and H. Moore. 2001. “Fail-Safe Approach for the V-22 Composite Proprotor Yoke.” In Composite Structures: Theory and Practice. ASTM International100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. https://doi.org/10.1520/stp14507s
- Alvaro D. H. Arroyo, Aniel S. Morais, Gabriela V. Lima, and Laura Ribeiro. 2021. “Modeling and Simulation of a Novel Tilt-Wing-Coaxial-Rotor Tricopter.” In Procedings do XV Simpósio Brasileiro de Automação Inteligente. SBA Sociedade Brasileira de Automática. https://doi.org/10.20906/sbai.v1i1.2627
- Alwang, Jeffrey, and Richard D. McLain. 1974. “Heavy-Lift Helicopter Engine Control System.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f30-037
- Amer, K., M. Harned, and R. Sullivan. 1967. “Hot Cycle Rotor/wing for High Speed City Center Transportation.” In 4th Annual Meeting and Technical Display. AIAA 1967-770. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1967-770
- Ames, Eric C., and Zachary S. Henry. 2000. “Advanced Rotorcraft Transmission II: Demonstrator Design.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f56-00003
- Amos, A. K., and H. R. Alexander. 1977. Simulation Study of Gust Alleviation in a Tilt Rotor Aircraft, Volume 1. NASA-CR-152050. NASA. https://ntrs.nasa.gov/citations/19780005095
- An, Jun-Young, and Chang-Joo Kim. 2026. “Generalized Rotor Kinematics Modeling for Coaxial and Tilt-Rotor Aircraft.” International Journal of Aeronautical and Space Sciences. https://doi.org/10.1007/s42405-026-01215-6
- Anantha, Sidharth, Akshay Mathur, and Ella M. Atkins. 2024. “Evaluation of a Tiltrotor Module for Electric Vertical Takeoff and Landing Flight.” In AIAA SCITECH 2024 Forum. AIAA 2024-2483. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-2483
- Ananthan, Shreyas, and J. Gordon Leishman. 2006. “Aerodynamic Optimization of a Coaxial Proprotor.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f62-005
- Anderson, Seth B. 1960a. An Examination of Handling Qualities Criteria for V/STOL Aircraft. NASA-TN-D-331. NASA. https://ntrs.nasa.gov/citations/19980223619
- Anderson, S. B. 1960b. Highlights of Handling Qualities Criteria for v STOL Aircraft. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19630004821
- Anderson, S. B. 1966. Considerations for Revision of V/STOL HANDLING Qualities Criteria. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19660015333
- Anderson, S. B. 1981. Historical Overview of V/STOL Aircraft Technology. NASA-TM-81280. NASA. https://ntrs.nasa.gov/citations/19810010574
- Anderson, S. 1983. “An Overview of V/STOL Aircraft Development.” In Aircraft Design, Systems and Technology Meeting. AIAA 1983-2491. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-2491
- Anderson, Seth B. 1990. “Jet-Powered V/STOL Aircraft: Lessons Learned.” In International Powered Lift Conference. https://ntrs.nasa.gov/citations/19920062680
- Anderson, R., J. Gill, and A. Novick. 1983. “Advanced Propfan Engine Characteristics and Technology Needs.” In 19th Joint Propulsion Conference. AIAA 1983-1155. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-1155
- Anderson, William G., Sandra Hoff, Dave Winstanley, John Phillips, and Scott DelPorte. 1993. “Heat Pipe Cooling of Turboshaft Engines.” In Volume 3A: General. American Society of Mechanical Engineers. https://doi.org/10.1115/93-gt-220
- Anderson, Seth B., and Victor Lebacqz. 1997. Historical Overview of V/STOL Aircraft Technology. NASA/TM-1997-81280. NASA. https://ntrs.nasa.gov/citations/20020051099
- Anderson, N., L. Nightingale, and D. Wagner. 1987. “Design and Test of a Propfan Gear System.” In 23rd Joint Propulsion Conference. AIAA 1987-2041. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-2041
- Anderson, Cody, Lars Ponten, Jason R. Fetty, Roozbeh Kiamanesh, and Treven Baker. 2017. “Hybrid Ceramic Bearing Fatigue Testing for the Future Advanced Rotorcraft Drive System Program.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12149
- Anderson, N., and D. Wagner. 1989. “Development Testing of the 578 Propfan Gear System.” In 25th Joint Propulsion Conference. AIAA 1989-2817. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2817
- Anderson, R., D. Wagner, R. Devlin, and A. Novick. 1984. “Advanced Propfan Drive System Characteristics and Technology Needs.” In 20th Joint Propulsion Conference. AIAA 1984-1194. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-1194
- Anderson, William D., and E. R. Wood. 1974. “AH-56A (AMCS) Compound Helicopter Vibration Reduction.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f30-021
- Androsky, A., S. C. Miller, J. A. Neiss, W. J. Portenier, and H. M. Webb. 1972. Study of V/STOL Aircraft Implementation. Volume 2: Appendices. NASA-CR-114518. NASA. https://ntrs.nasa.gov/citations/19730007282
- Anfossi, Jody, Jafar Al-Zaili, Tala El Samad, and Abdulnaser Sayma. 2022. “Performance Assessment of a Recuperated Turboshaft Engine: A Multifuel Case.” In Volume 4: Cycle Innovations; Cycle Innovations: Energy Storage. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2022-80455
- Angelov, Jorg, and Florian Holzapfel. 2022. “A Continuity-Based Command Mapping Approach Applied to Airspeed Control of VTOL Transition Aircraft in the Context of Simplified Vehicle Operations.” In AIAA SCITECH 2022 Forum. AIAA 2022-1385. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-1385
- Anikin, Viktor Andreevich, Oleg Vladimirovich Animitsa, Vladimir Mikhailovich Kuvshinov, and Veniamin Aleksandrovich Leontiev. 2015. “Design of Fly-by-Wire Control System Algorithms for Advanced High-Speed Helicopter.” TsAGI Science Journal 46 (3): 259–87. https://doi.org/10.1615/tsagiscij.2015014083
- Annamalai, Vinoth Kumar, and Selvakumaran Thunaipragasam. 2021. “Design, Modeling and Simulation of a Control Surface-Less Tri-Tilt-Rotor UAV.” Aircraft Engineering and Aerospace Technology 94 (4): 541–52. https://doi.org/10.1108/aeat-08-2021-0253
- Aoki, Yoshihisa, and Koji Muraoka. 2019. “Forward Wing Tip Design for Induced Drag Reduction of Quad Tilt Wing VTOL Un-Manned Plane in Cruise.” In AIAA Scitech 2019 Forum. AIAA 2019-1307. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1307
- “Aplicação De Transdutores Piezoelétricos Para o Controle Da Instabilidade De Whirl-Flutter.” 2022. In Congreso Iberoamericano de Ingeniería Mecánica-CIBIM 2022. Universidad Nacional de Educación a Distancia (España). https://doi.org/10.5944/bicim2022.068
- Apodaca Moreno, Maria Regina. 2018. “Fundamental Study into Rotor Outwash and Dust Kick-up under Mars-like Conditions.” PhD diss., Universidad Nacional Autonoma de Mexico. https://ntrs.nasa.gov/citations/20180008693
- Appleton, Wesley. 2023. “Tiltrotor Aeromechanics.” In Springer Aerospace Technology. Springer International Publishing. https://doi.org/10.1007/978-3-031-12437-2_5
- Appleton, W., A. Filippone, and N. Bojdo. 2021. “Interaction Effects on the Conversion Corridor of Tiltrotor Aircraft.” Aeronautical Journal 125 (1294): 2065–86. https://doi.org/10.1017/aer.2021.33
- “Application of Computational Fluid Dynamic Methods to the Component Aerodynamic Design of the V-22 Osprey Tilt Rotor Vehicle.” 1990. In Applied Computational Aerodynamics. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/5.9781600865985.0637.0678
- Arakawa, Chuichi, Shigeru Saito, Hiroshi Kobayashi, and Yuichi Matsuo. 1989. “Navier-Stokes Simulations around a Propfan Using Higher-Order Upwindschemes.” In 25th Joint Propulsion Conference. AIAA 1989-2699. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2699
- Araki, Hiroshi. 1963. “Some Considerations on the Propeller-Nacelle Whirl Flutter.” Journal of the Japan Society of Aeronautical Engineering 11 (111): 95–101. https://doi.org/10.2322/jjsass1953.11.95
- Arcidiacono, Peter J., Gary deSimone, and John J. Occhiato. 1980. “Preliminary Evaluation of RSRA Data Comparing Pure Helicopter, Auxiliary Propulsion and Compound Helicopter Flight Characteristics.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f36-010
- Arcidiacono, Peter J., Gary deSimone, and John Occhiato. 1982. “Preliminary Evaluation of RSRA Data Comparing Pure Helicopter, Auxiliary Propulsion and Compound Helicopter Flight Characteristics.” Journal of the American Helicopter Society 27 (1): 42–51. https://doi.org/10.4050/jahs.27.42
- Arco, António, José Lobo Do Vale, Sean Bazzocchi, and Afzal Suleman. 2023. “Investigation on the Airworthiness of a Novel Tri-Rotor Configuration for a Fixed Wing VTOL Aircraft.” International Journal of Aviation Science and Technology vm04 (is02): 53–62. https://doi.org/10.23890/ijast.vm04is02.0201
- Arita, Shunsaku, Noriaki Itoga, and Ryoya Hayashi. 2022. “Flap Usage Considering Swirl Velocities to Reduce the Download on a Winged Helicopter in Hover.” Transactions of the Japan Society for Aeronautical and Space Sciences 65 (4): 195–203. https://doi.org/10.2322/tjsass.65.195
- Arl, Us Army Ccdc, Andrew R. Kreshock, Us Army Ccdc AvMC, et al. 2020. “Pretest Flutter Predictions of the Upcoming Aeroelastic Tiltrotor Wind Tunnel Test.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0076-2020-16436
- Armstrong, Johnny G. 1977. Flight Planning and Conduct of the X-24B Research Aircraft Flight Test Program. Defense Technical Information Center. https://doi.org/10.21236/adb029224
- Arnold, J. 2025. “Flutter Assessment of a Rotor Blade in Hover Based on Indicial Aerodynamics Considering Blade Aerofoil, Rotor Inflow and Wake Periodicity.” Aeronautical Journal 129 (1333): 593–608. https://doi.org/10.1017/aer.2024.95
- Arnold, James R., Michelle Corning, and Michael K. Farrell. 1987. “One Engine Inoperative Takeoff Climb Performance of the XV-15 Tilt Rotor.” In SAE Technical Paper Series, vol. 1. SAE International. https://doi.org/10.4271/871851
- Arroyo, Alvaro. n.d. “Modelagem, Simulação e Controle De Uma Nova Proposta De Aeronave Tricóptero Tilt-Wing-Coaxial-Rotor.” PhD diss., Universidade Federal de Uberlândia. https://doi.org/10.14393/ufu.di.2021.716
- Asalani, Y. K., A. A. Arif, and R. A. Sasongko. 2020. “Modelling and Analysis of Tiltrotor Aircraft Flight Dynamics Based on Numerical Simulation.” In AIP Conference Proceedings, vol. 2232. AIP Publishing. https://doi.org/10.1063/5.0002435
- Ashby, Dale L., and William Eadie. 2002. “High Speed Rotorcraft Concepts.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f58-00089
- Ashby, Dale, William Eadie, and Guy Juan Montoro. 2002. “An Investigation of the Reverse Velocity Rotor Concept and Its Application to High Speed Rotorcraft.” In 2002 Biennial International Powered Lift Conference and Exhibit. AIAA 2002-5991. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-5991
- Ashok, Sylvester, Daniel P. Schrage, and Alexander Robledo. 2011. A Systems Engineering Modeling and Simulation Approach for Rotorcraft Drive System Optimization. https://doi.org/10.4050/vfs-f67-000176
- Ashok, Sylvester, Daniel Schrage, and Brian Wade. 2010. “Variable Speed Transmission Using a Planetary Gear System for High Speed Rotorcraft Application.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f66-000255
- Astridge, D. G. 1996. “Rotorcraft Transmission System HUM Requirements Derived from Design Safety Analysis.” Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 210 (3): 271–79. https://doi.org/10.1243/pime_proc_1996_210_370_02
- Atencio, Adolph, Jr., and Carolyn Banda. 1998. Short Haul Civil Tiltrotor Study in MIDAS: Auto versus Manual Nacelle Procedures for Commanded Go-Around. NASA/TM-1998-208753. NASA. https://ntrs.nasa.gov/citations/19990009997
- Atkinson, R. P., and C. C. Raymond. 1968. Preliminary Design Study of Convertible Fan/shaft Engines. Defense Technical Information Center. https://doi.org/10.21236/ad0673148
- Attia, Marco S., Richard W. Eustace, and Shane C. Favaloro. 2010. “The Predicted and Measured Effects of Increasing Back Pressure on the Performance of a Turboshaft Engine.” In Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Education; Electric Power; Manufacturing Materials and Metallurgy. ASMEDC. https://doi.org/10.1115/gt2010-22323
- Auer, B. M., H. C. Haller, and S. Lieblein. 1971. Computer Program for Preliminary Design and Analysis of V/STOL Tip-Turbine Fans. NASA-TN-D-6161. NASA. https://ntrs.nasa.gov/citations/19710008166
- Aulehla, F., and G. K. Kissel. 1981. “Experience with High Performance V/STOL Fighter Projects at MBB.” In V/STOL Conference. https://ntrs.nasa.gov/citations/19820033366
- Author, Unknown. 1989. NASA National Civil Tiltrotor Initiative. https://doi.org/10.4050/sm_rotary_1989-3563
- Author, Unlisted. 2003a. Advanced Rotorcraft Transmission II (ART II). https://doi.org/10.4050/sm_prop_2003-1483
- Author, Unlisted. 2003b. Rolls-Royce: Advanced Technology for Turboshaft Engines. https://doi.org/10.4050/sm_prop_2003-4101
- Author, Unlisted. 2007. GE’s Approach to Turboshaft Engine Condition Based Maintenance. https://doi.org/10.4050/sm_prop_2007-2880
- Avera, Michael. 2019. “VTOL Concepts for Unmanned Payload Delivery Applications.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14535
- Avital, E. J., T. Korakianitis, and F. Motallebi. 2018. “Low Reynolds Number Proprotor Aerodynamic Performance Improvement Using the Continuous Surface Curvature Design Approach.” Aeronautical Journal 123 (1259): 20–38. https://doi.org/10.1017/aer.2018.124
- AvMC, Us Army Ccdc, Tom Berger, Joseph F. Horn, and Mark B. Tischler. 2020a. “Outer-Loop Control Design and Simulation Handling Qualities Assessment for a Coaxial-Compound Helicopter and Tiltrotor.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0076-2020-16392
- AvMC, Us Army Ccdc, Hyeonsoo Yeo, and Hossein Saberi. 2020b. “Tiltrotor Conversion Maneuver Analysis with RCAS.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0076-2020-16437
- Award notice HR001123S0031-HR001124C0325. 2023. “7 November.” https://sam.gov/opp/3ac7bd3561814c5ba08a018808625efb/view
- Award notice HR001123S0031-HR001124C0326. 2023. “2 November.” https://sam.gov/opp/0bb6f0314d974204918b67dca6dbb098/view
- Award notice HR001123S0031-HR001124C0327. 2023. “7 November.” https://sam.gov/opp/3aed0e7af55f4302a1f1135973322645/view
- Awker, R. 1986. “Application of Propfan Propulsion to General Aviation.” In Aircraft Systems, Design and Technology Meeting. AIAA 1986-2698. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-2698
- Bachelder, Edward N., Bimal L. Aponso, Tom Berger, and Martine Godfroy-Cooper. 2021. “Pilot Workload and Performance Assessment for a Coaxial-Compound Helicopter and Tiltrotor during Aggressive Approach.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16799
- Bachelder, Edward N., Tom Berger, Bimal L. Aponso, and Jeff A. Lusardi. 2023. “Method for Predicting Multi-Axis Task Performance and Handling Qualities Rating for a Coaxial-Compound and Tiltrotor Rotorcraft with Validating Data.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18069
- Bachmaier, Benjamin, and Richard P. Anderson. 2021a. “Lateral-Directional Stability and Control Aspects of Small Tiltrotor Aircraft Hovering in Significant Wind.” In AIAA Aviation 2021 Forum. AIAA 2021-3215. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-3215
- Bachmaier, Benjamin, and Richard Anderson. 2021b. “Wind Estimation Based on the Specific Hover Characteristics of Small Tiltrotor Airplanes.” In AIAA Scitech 2021 Forum. AIAA 2021-1680. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-1680
- Baeder, J. D. 1991. “Euler Solutions to Nonlinear Acoustics of Non-Lifting Hovering Rotor Blades.” In European Rotorcraft Forum. https://ntrs.nasa.gov/citations/19910010513
- Baeder, James D., and Vinit Gupta. 2002. “Quad Tiltrotor Aerodynamics in Ground Effect.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f58-00134
- Baeder, James D., Tarandeep S. Kalra, and Vinod K. Lakshminarayan. 2010. “CFD Validation of Micro Hovering Rotor in Ground Effect.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f66-000103
- Bagai, Ashish, and J. Gordon Leishman. 1995a. “Free-Wake Analysis of Tandem, Tilt-Rotor and Coaxial Rotor Configurations.” In Proceedings of the Vertical Flight Society Forum 51 - Ft. Worth, TX 1995. The Vertical Flight Society. https://doi.org/10.4050/vfs-f51-1063
- Bagai, Ashish, and J. Gordon Leishman. 1995b. “Free-Wake Analysis of Tandem, Tilt-Rotor and Coaxial Rotor Configurations.” Journal of the American Helicopter Society 41 (3): 1–20. https://doi.org/10.4050/jahs.41.196
- Bagan, M. 1967. “Historical Progress in Cost Reduction of VTOL AIRCRAFT Operations.” In 4th Annual Meeting and Technical Display. AIAA 1967-826. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1967-826
- Baggett, Jennifer, Andrew Kreshock, and Jinwei Shen. 2021. “Comparison of Wind Tunnel Tiltrotor Loads of Two Hub Types under Different Pylon Angles with Multibody Dynamics Analyses.” In Proceedings of the Vertical Flight Society 77th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0077-2021-16759
- Baghdadi, Samy. 1987. “Compressors for Advanced Turboshaft Engines.” Journal of the American Helicopter Society 32 (3): 67–70. https://doi.org/10.4050/jahs.32.3.67
- Bailey, Bruce, Michael Bartley, Art Phelps, Martin Snowden, Jai Moo Kim, and Myeong Kyu Lee. 2006. “Design of an Advanced Composite Proprotor Blade for the Tilt-Rotor Smart UAV.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f62-066
- Bailey, R. O., S. C. Smith, and J. B. Bustie. 1983. Propulsion Simulation Test Technique for V/STOL Configurations. SAE PAPER 831427. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19840046742
- Baird, Eugene, Elmer Bauer, and Jerome Kohn. 1972. Model Tests and Analysis of Prop-Rotor Dynamics for Tilt-Rotor Aircraft. https://doi.org/10.4050/sm_vstol_1972-3496
- Baldwin, G. Douglas. 2007. “Utility of a Mono Tiltrotor (MTR) Scaled Demonstrator.” In Proceedings of the Vertical Flight Society Forum 63 - Virginia Beach, VA 2007. The Vertical Flight Society. https://doi.org/10.4050/vfs-f63-100
- Balke, R. W. 1970. “A Review of Turbine Engine Vibration Criteria for VTOL Aircraft.” In Proceedings of the Specialists Meeting on Environmental Effects on VTOL Designs - Arlington, Texas 1970. The Vertical Flight Society. https://doi.org/10.4050/sm_env_1970-1326
- Ballard, John D., Kenneth L. Orloff, and Alan Luebs. 1980. “Effect of Tip Shape on Blade Loading Characteristics and Wake Geometry for a Two-Bladed Rotor in Hover.” Journal of the American Helicopter Society 25 (1): 30–35. https://doi.org/10.4050/jahs.25.30
- Barakos, George N., and Antonio Jimenez-Garcia. 2016. “Hover Predictions of the S-76 Rotor Using HMB2: Model to Full Scale.” In 54th AIAA Aerospace Sciences Meeting. AIAA 2016-0299. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-0299
- Barkai, Shirley M., and Omri Rand. 1998. “The Influence of Composite Induced Couplings on Tiltrotor Whirl Flutter Stability.” Journal of the American Helicopter Society 43 (2): 133. https://doi.org/10.4050/jahs.43.133
- Barnes, Chris. n.d. “A CFD Analysis of the Download Reduction for the V-22 Osprey Wing.” PhD diss., West Virginia University Libraries. https://doi.org/10.33915/etd.10843
- Barnes, J. Philip. 2017. “Hybrid Blade Element and Lifting Line for Propeller or Propfan Performance.” In 35th AIAA Applied Aerodynamics Conference. AIAA 2017-3570. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-3570
- Barr, David T. 2011. Intelligence Support to Personnel Recovery: Is USPACOM Ready for the Unexpected?. Defense Technical Information Center. https://doi.org/10.21236/ada546172
- Barrack, J. P., and J. V. Kirk. 1968. “Low-Speed Characteristics of High-Performance Lift-Engine V/STOL Aircraft.” In SOCIETY OF AUTOMOTIVE ENGINEERS. https://ntrs.nasa.gov/citations/19680064100
- Barrack, J. P., and J. V. Kirk. 1970. Reingestion Characteristics and Inlet Flow Distortion of V/STOL Lift-Engine Fighter Configurations. NASA-TN-D-7014. NASA. https://ntrs.nasa.gov/citations/19710003945
- Bartel, H., and G. Swift. 1989. “Near-Field Acoustic Characteristics of a Single-Rotor Propfan.” In 12th Aeroacoustic Conference. AIAA 1989-1055. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-1055
- Bartie, K., H. Alexander, M. McVeigh, S. Lamon, and H. Bishop. 1986. Hover Performance Tests of Baseline Metal and Advanced Technology Blade (ATB) Rotor Systems for the XV-15 Tilt Rotor Aircraft. NASA-CR-177436. NASA. https://ntrs.nasa.gov/citations/19880016983
- Barton, J., O. Yamamoto, and L. Bober. 1985. “Inviscid Analysis of Advanced Turboprop Propeller Flow Fields.” In 21st Joint Propulsion Conference. AIAA 1985-1263. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-1263
- Basgall, Brandon, Bruno Moorthamers, Drew Darrah, Adam D’Silva, Wanbo Liu, and Willem A. Anemaat. 2024. “Conceptual Design of RUFUS, an Uncrewed Ducted Fan VTOL Aircraft.” In AIAA Aviation Forum and Ascend 2024. AIAA 2024-4428. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-4428
- Baskin, Bryan Kenneth. 2023. Low-Drag Blade Tip. https://patents.google.com/patent/US11643195B2/en
- Bass, Steven M., and John W. Rutherford. 1993. “The Design Evolution of the Canard Rotor/Wing.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f49-2012
- Bass, Steven, Thomas Thompson, and John Rutherford. 1995. “Fixed-Wing Performance Predictions of the Canard Rotor/wing Concept Based on Wind Tunnel Test Results.” In 13th Applied Aerodynamics Conference. AIAA 1995-1887. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1995-1887
- Bass, Steven, Thomas Thompson, John Rutherford, and Stephen Swanson. 1993. “Low-Speed Wind Tunnel Test Results of the Canard Rotor/Wing Concept.” In 11th Applied Aerodynamics Conference. AIAA 1993-3412. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-3412
- Bastian, Nathaniel D., Lawrence V. Fulton, Robert Mitchell, Wayne Pollard, David Wierschem, and Ronald Wilson. 2012. “The Future of Vertical Lift: Initial Insights for Aircraft Capability and Medical Planning.” Military Medicine 177 (7): 863–69. https://doi.org/10.7205/milmed-d-11-00437
- Bastos, Sérvio Túlio S. Haramura, and Rui Marcos Grombone de Vasconcellos. 2023. “Whirl-Flutter Control through Direct Piezoelectric Effect.” Engineering & Technology Scientific Journal 1 (1). https://doi.org/10.55977/etsjournal.v01i01.e023001
- Bath, Peter, Ann Gaitonde, and Dorian Jones. 2021. “The Use of Periodic Reduced Order Models in Coupled Flight Mechanics Analysis of Tiltrotor Aircraft.” In AIAA Scitech 2021 Forum. AIAA 2021-1201. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-1201
- Bath, Peter E., Ann Gaitonde, and Dorian Jones. 2022. “Reduced Order Aerodynamics and Flight Mechanics Coupling for Tiltrotor Aircraft Stability Analysis.” In AIAA SCITECH 2022 Forum. AIAA 2022-0284. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-0284
- Bath, Peter E., Ann Gaitonde, and Dorian P. Jones. 2023. “Including Steady State Information in Reduced Order Modelling for Tiltrotor Aircraft Stability Analysis.” In AIAA AVIATION 2023 Forum. AIAA 2023-3948. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-3948
- Batra, N., L. Dooley, T. Sheehan, and K. Goldstein. 1986b. “Use of Simulation during Preliminary Design of the V-22 Osprey.” In 24th Aerospace Sciences Meeting. AIAA 1986-491. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-491
- Batra, Narendra N., Dwayne F. Kimball, and T. A. Sheehan. 1986a. “Early Evaluation of the V-22 Osprey through Piloted Simulation.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f42-2022
- Batrakov, A. S. 2021. “Mathematical Model of the Fuselage of a Promising High-Speed Helicopter.” Russian Aeronautics 64 (2): 360–63. https://doi.org/10.3103/s1068799821020264
- Battezzato, L., and R. Pias. 1989. “Technology Development Required by Propfan Power Reduction Gearboxes.” In 25th Joint Propulsion Conference. AIAA 1989-2818. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2818
- Bauer, A. 1983. “Simulation of Propfan Noise Impact on a Fuselage.” In 8th Aeroacoustics Conference. AIAA 1983-715. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-715
- Bauer, Carl, Scott J. Brick, Douglas S. Fischer, and Curtis Walz. 1999. “Nacelle Control Augmentation for Tiltrotor Flight Directors.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f55-00116
- Bauknecht, Andre, Clemens Schwarz, Markus Raffel, and Stephan Mailänder. 2019. “Flow Measurement Techniques for Rotor Wake Characterization on Free-Flying Helicopters in Ground Effect.” In AIAA Scitech 2019 Forum. AIAA 2019-2107. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-2107
- Bayoumi, Abdel E., William Ranson, Mohammad Ahmed, and David Green. 2003. Mechanical Diagnosis and Prognosis of the Rotorcraft Power Trains for the Army HUMS System Demonstration. https://doi.org/10.4050/sm_prop_2003-3436
- Bazmi, Farshid, and Afshin Rahimi. 2021. “Helicopter Turboshaft Engine Database as a Conceptual Design Tool.” SAE International Journal of Engines 15 (1): 31–56. https://doi.org/10.4271/03-15-01-0003
- Beattie, E. 1975. “Control Considerations for Lift-Cruise Engines in a V/STOL Fighter Aircraft.” In 11th Propulsion Conference. AIAA 1975-1177. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1975-1177
- Beatty, T. D., and M. K. Worthey. 1984. Advanced Prediction Technique for the Low Speed Aerodynamics of V/STOL Aircraft. Volume 1: Technical Discussion. NASA-CR-166442-VOL-1. NASA. https://ntrs.nasa.gov/citations/19840018594
- Bechhoefer, Eric R., and Mina Hajimohammadali. 2023. “Process for Turboshaft Engine Performance Trending.” In Annual Conference of the PHM Society, vol. 15. https://doi.org/10.36001/phmconf.2023.v15i1.3490
- Bechhoefer, Eric R., and Fatemeh Hajimohammadali. 2024. “Process for Real-Time Monitoring of a Turboshaft Engine.” In Annual Conference of the PHM Society, vol. 16. https://doi.org/10.36001/phmconf.2024.v16i1.3929
- Becker, Mark D., and Brian Frounfelker. 1992. “Gyroscopic Test for the T800-LHT-800 Turboshaft Engine.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/921955
- Beebe, J. 1968. “Some Projections on Subsonic Aircraft and Structures in the 80’s with Emphasis on V/STOL Type Aircraft.” In Aircraft Design for 1980’s Operations Meeting. AIAA 1968-213. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1968-213
- Beeler, E. F. 1965. Lift Fan V/STOL. https://doi.org/10.4050/sm_vstol_1965-3356
- Beeler, E. F., and L. J. Volk. 1965. “Lift Fan Propulsion Systems V/STOL Aircraft Control.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/650831
- Beh, H., G. Hofinger, and P. Huber. 2018. “Control Law Design and Flight Test Results of the Experimental Aircraft X-31A.” In Advances in Aircraft Flight Control. Routledge. https://doi.org/10.1201/9781315136820-15
- Behbahani, Alireza, Eric Feron, James Paduano, Nthan Fitzgerald, and Mehrdad Pakmehr. 2011. “Decentralized Piecewise Linear Modeling of a Turboshaft Engine Driving a Variable Pitch Propeller.” In AIAA Modeling and Simulation Technologies Conference. AIAA 2011-6722. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2011-6722
- Belák, Jan, and Martin Hromčík. 2023a. “Modular Propeller-Wing Interaction Modeling Method for Tilt-Rotor Aircraft.” Preprint, . https://doi.org/10.2139/ssrn.4671509
- Belapurkar, Rohit, Rama Yedavalli, and Paul Paluszewski. 2011. “Design of Set-Point Controller for Partially Distributed Turboshaft Engine with Network Faults.” In 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. AIAA 2011-5858. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2011-5858
- Belardo, Marika, Jacopo Beretta, Aniello Daniele Marano, Gianluca Diodati, Nicola Paletta, and Luigi Di Palma. 2020. “On the Preliminary Structural Design Strategy of the Wing of the Next-Generation Civil Tiltrotor Technology Demonstrator.” International Journal of Aeronautical and Space Sciences 22 (3): 613–24. https://doi.org/10.1007/s42405-020-00330-2
- Belardo, Marika, Aniello Menichino, Gianluca Diodati, et al. 2024. “T-WING: The Italian Wing for the Next Generation Civil Tiltrotor.” In AIAA SCITECH 2024 Forum. AIAA 2024-1492. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1492
- Bell Aerospace Co Buffalo Ny. 1970. X-22A Tri-Service V/STOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0871466
- “The Bell X-22A V/STOL, Variable Stability Research Airplane: Lessons Learned.” 1990. In Aircraft Design, Systems and Operations Conference. AIAA 1990-3207. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3207
- Bellin, A. I., and A. Brooks. 1983. “Status Report: DARPA/NASA Convertible Turbofan/Turboshaft Engine Program.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/83-gt-196
- Benger, B. S., T. Jordan, and D. V. Humpherson. 1993. “The Compound Helicopter: The Rotorcraft for the 21st Century?” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f49-2054
- Bennett, R. M., and S. R. Bland. 1964. Experimental and Analytical Investigation of Propeller Whirl Flutter of a Power Plant on a Flexible Wing. NASA-TN-D-2399. NASA. https://ntrs.nasa.gov/citations/19640017748
- Bennett, Richard L., Ross K. Brown, Raymond G. Kvaternik, et al. 2001a. “An Experimental Evaluation of Generalized Predictive Control for Tiltrotor Aeroelastic Stability Augmentation in Airplane Mode of Flight.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f57-00071
- Bennett, Richard L., Ross K. Brown, Raymond G. Kvaternik, et al. 2001c. “A Wind-Tunnel Parametric Investigation of Tiltrotor Whirl-Flutter Stability Boundaries.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f57-00168
- Bennett, H., A. Hays, and G. Herstine. 1983. “Advanced Turboprop and Dual Cycle Engine Performance Benefits and Installation Options on a Mach 0.7 Shorthaul Transport Aircraft.” In 19th Joint Propulsion Conference. AIAA 1983-1212. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-1212
- Bennett, C. Thomas, Wayne Johnson, and K. A. O’Donnell. 1988. “Dynamic Perspective Displays and the Control of Tilt-Rotor Aircraft in Simulated Flight.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f44-017
- Bennett, R. M., and W. H. Reed III. 1963. Propeller Whirl Flutter Considerations for V/STOL Aircraft. NASA. https://ntrs.nasa.gov/citations/19630025041
- Bennett, Lorri A., Timothy W. Simpson, and Mike Yukish. 2001b. “Rotorcraft Conceptual Design Environment.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f57-00136
- Bennink, James, and Jack W. Langelaan. 2024. “Design and Initial Flight Testing of a Coaxial Tilting-Head Compound Rotorcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-0008
- Beno, E. 1968. “A Study of Measured Parametric Effects of Rotor Loading on Blade Airloads, Blade Response, and Hub Forces on a High Speed Compound Helicopter.” In 5th Annual Meeting and Technical Display. AIAA 1968-980. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1968-980
- Bentele, Max, and Justin J. Laborde. 1972. “Evolution of Small Turboshaft Engines.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/720830
- Bentley, Erskine, and Larry Sission. 2015. “Joint Future Vertical Lift Initiative.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10223
- Beppu, G., and H. C. Curtiss Jr. 1966. An Analytical Study of Factors Influencing the Longitudinal Stability of Tilt-Wing VTOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0640945
- Berend, Gábor. 2020. “Comparison of Different Approaches for Modeling Vortex: Rotor Wake Interference on Rotor Trim.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0076-2020-16284
- Berger, Tom, Chris L. Blanken, Jeff A. Lusardi, Mark B. Tischler, and Joseph F. Horn. 2022a. “Coaxial-Compound Helicopter Flight Control Design and High-Speed Handling Qualities Assessment.” Journal of the American Helicopter Society 67 (3): 98–113. https://doi.org/10.4050/jahs.67.032008
- Berger, Tom, Chris L. Blanken, Jeff A. Lusardi, Mark B. Tischler, and Joseph F. Horn. 2022b. “Tiltrotor Flight Control Design and High-Speed Handling Qualities Assessment.” Journal of the American Helicopter Society 67 (3): 114–28. https://doi.org/10.4050/jahs.67.032009
- Berger, Tom, Joseph F. Horn, Chris L. Blanken, and Mark Tischler. 2019. “Flight Control Design and Simulation Handling Qualities Assessment of High Speed Rotorcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14595
- Berger, Tom, Joseph F. Horn, Doug Miller, Grey Hagwood, and Derek Bridges. 2024. “Piloted Simulation Evaluation of Damage Tolerant Control for a Tiltrotor.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1348
- Berger, Tom, Joseph F. Horn, and Mark Tischler. 2021. “High-Speed Rotorcraft Pitch Axis Response Type Investigation.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16793
- Berger, Tom, Mark B. Tischler, and Joseph F. Horn. 2023. “High-Speed Rotorcraft Pitch Axis Response Type Investigation.” Journal of the American Helicopter Society 68 (3): 32001–17. https://doi.org/10.4050/jahs.68.032001
- Bergquist, R. 1964. “Some Problems of Design and Operation of a 250- Knot Compound Helicopter Rotor.” In General Aviation Aircraft Design and Operations Meeting. AIAA 1964-195. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-195
- Berman, Robert. 1987. “Certification of Propfan Propulsion Systems and Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/871845
- Berry, Ben, and Inderjit Chopra. 2012. Performance and Vibratory Load Measurements of a Slowed Rotor at High Advance Ratios. https://doi.org/10.4050/vfs-f68-000206
- Berry, Victor, David Lindsay, Tom Parham Jr., David Popelka, and Donald J. Baker. 1995. “Results of an Aeroelastic Tailoring Study for a Composite Tiltrotor Wing.” In Proceedings of the Vertical Flight Society Forum 51 - Ft. Worth, TX 1995. The Vertical Flight Society. https://doi.org/10.4050/vfs-f51-2020
- Beser, J. 1978. “Approach Guidance Logic for a Tilt-Rotor Aircraft.” In Guidance and Control Conference. AIAA 1978-1295. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1978-1295
- Bettner, James. 1990a. “Component Arrangement Studies for an 8000 Shp Turboshaft High Technology Core.” In 26th Joint Propulsion Conference. AIAA 1990-2398. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-2398
- Bettner, J. 1990b. “Precurser Convertible Engine Study.” In 26th Joint Propulsion Conference. AIAA 1990-2486. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-2486
- Bettner, J., J. Hawkins, and C. Blandford. 1992. “High Speed Rotorcraft Propulsion Concepts to Control Power/speed Characteristics.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3367. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3367
- Bettner, J., R. Yount, T. Ronan, and D. Pesetsky. 1991. “High Speed Rotorcraft Propulsion System Studies.” In 27th Joint Propulsion Conference. AIAA 1991-2150. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-2150
- Betzina, M. D., and M. D. Falarski. 1979. “Aerodynamics of a Tilt-Nacelle V/STOL Propulsion System.” In Workshop of V/STOL Aerodynamics. https://ntrs.nasa.gov/citations/19790018967
- Betzina, Mark D., W. Johnson, and Cahit Kitaplioglu. 2000. “Blade-Vortex Interaction Noise of an Isolated Full-Scale XV-15 Tilt-Rotor.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f56-04
- Betzina, Mark D., and Khanh Q. Nguyen. 2003. Method and System for Active Noise Control of Tiltrotor Aircraft. NASA-Case-ARC-14606-1. NASA. https://ntrs.nasa.gov/citations/20040013330
- Betzina, Mark D., and Khanh Q. Nguyen. 2004. Blade-Pitch Control for Quieting Tilt-Rotor Aircraft. ARC-14606. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20110016662
- Bevan, Rhodri, Daniel J. Poole, Christian B. Allen, and T. Rendall. 2015. “Simulation and Surrogate-Based Design of Rectangular Vortex Generators for Tiltrotor Aircraft Wings.” In 33rd AIAA Applied Aerodynamics Conference. AIAA 2015-2725. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-2725
- Bhagwat, Mahendra, Marvin Moulton, and Francis Caradonna. 2006. “Hybrid CFD for Rotor Hover Performance Prediction.” In 24th AIAA Applied Aerodynamics Conference. AIAA 2006-3474. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-3474
- Bhandari, Rajan, and Imon Chakraborty. 2026a. Multiscale Design and Optimization of a VTOL Aircraft for Disaster Relief. https://doi.org/10.4050/sm-2026-vlada-5185
- Bhandari, Rajan, and Imon Chakraborty. 2026b. “Optimization of a Hybrid-Electric Multi-Tilt-Rotor Aircraft with Conventional and Vertical Takeoff and Landing Capabilities.” In Proceedings of the Vertical Flight Society 82nd Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0082-2026-0206
- Bhandari, Rajan, Imon Chakraborty, and Jason Cornelius. 2025a. “Sizing and Analysis of VTOL Configurations for Mars and Titan Using the PEACE Framework.” In AIAA Aviation Forum and Ascend 2025. AIAA 2025-3700. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-3700
- Bhandari, Rajan, Benjamin M. Davis, Stefanus H. Putra, and Imon Chakraborty. 2025b. “Sizing and Optimization of a Subscale VTOL Aircraft with COTS Components Using the PEACE Framework.” In AIAA Aviation Forum and Ascend 2025. AIAA 2025-3699. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-3699
- Bhandari, Rajan, Aashutosh A. Mishra, and Imon Chakraborty. 2023. “Genetic Algorithm Optimization of Lift-Plus-Cruise VTOL Aircraft with Electrified Propulsion.” In AIAA SCITECH 2023 Forum. AIAA 2023-0398. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-0398
- Bhattacharya, S., A. T. Conlisk, B. Ganesh, et al. 2003. “Development of Unsteadiness in the Wake of a Rotor in Ground Effect.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f59-000051
- Bhattacharyya, Somnath, and A. Conlisk. 2003. “The Structure of the Rotor Wake in Ground Effect.” In 41st Aerospace Sciences Meeting and Exhibit. AIAA 2003-1255. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-1255
- Bi, Naipei, and David Haas. 2002. “Investigation of Low Airspeed Estimation for Tiltrotor Aircraft Using Neural Networks.” In AIAA Modeling and Simulation Technologies Conference and Exhibit. AIAA 2002-4867. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-4867
- Bi, Naipei, David Haas, and Kelly McCool. 2005. “Numerical Study on the Robustness of a Neural Network Model for Gross Weight Estimation of Tiltrotor Aircraft.” In AIAA Modeling and Simulation Technologies Conference and Exhibit. AIAA 2005-6112. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2005-6112
- Biesiadny, Thomas, Brett Berger, Gary Klann, and David Clark. 1987. “Contingency Power for Small Turboshaft Engines Using Water Injectioninto Turbine Cooling Air.” In 23rd Joint Propulsion Conference. AIAA 1987-1906. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-1906
- Biggers, J. C., D. J. Giulianetti, and R. L. Maki. 1966. Longitudinal and Lateral-Directional Aerodynamic Characteristics of a Large-Scale, V/STOL Model with Four Tilting Ducted Fans Arranged in a Dual Tandem Configuration. NASA-TN-D-3490. NASA. https://ntrs.nasa.gov/citations/19660019928
- Biggi, Massimo, Pierre Abdel Nour, and Giorgio Vicenzotti. 2024. “Next Generation Civil Tiltrotor Technology Demonstrator Program: Towards Flight Test.” In AIAA SCITECH 2024 Forum. AIAA 2024-1491. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1491
- Bilger, J., R. Marr, and A. Zahedi. 1981a. “In-Flight Structural Dynamic Characteristics of the XV-15 Tilt Rotor Research Aircraft.” In Dynamics Specialists Conference. AIAA 1981-612. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-612
- Bilger, J. M., R. L. Marr, and Ahmad Zahedi. 1981b. Results of Structural Dynamic Testing of the XV-15 Tilt Rotor Research Aircraft. https://doi.org/10.4050/vfs-f37-043
- Bilger, J. M., Roger L. Marr, and Ahmad Zahedi. 1982b. “Results of Structural Dynamic Testing of the XV-15 Tilt Rotor Research Aircraft.” Journal of the American Helicopter Society 27 (2): 58–65. https://doi.org/10.4050/jahs.27.58
- Bill, R. C. 1990. “Advanced Rotorcraft Transmission Program.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f46-1013
- Bill, Robert. 1992. “Summary Highlights of the Advanced Rotorcraft Transmission (ART) Program.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3362. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3362
- Binkley, V. 1986. “Hybrid Heavy Lift VTOL Aircraft and Their Potential Use in Forest Harvest.” In Aircraft Systems, Design and Technology Meeting. AIAA 1986-2701. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-2701
- Birckelbaw, Lourdes G., Lloyd D. Corliss, William S. Hindson, and Gary B. Churchill. 1994. Piloted Simulation Study of Two Tilt-Wing Flap Control Concepts, Phase 2. NASA-TM-108817. NASA. https://ntrs.nasa.gov/citations/19940029492
- Birckelbaw, Larry, and Edward Nelson. 1992. “Infrared Flow Visualization of V/STOL Aircraft.” In Guidance, Navigation and Control Conference. AIAA 1992-4253. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-4253
- Black, Scott, Young Shen, and Stuart Jessup. 2006. “Advanced Blade Sections for High Speed Propellers.” In SNAME 11th Propeller and Shafting Symposium. SNAME. https://doi.org/10.5957/pss-2006-10
- Blackburn, W. E. 1965. “High Speed Helicopter Research with Jet Thrust Augmentation.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f21-003
- Blackburn, W. E., and A. D. Rita. 1968. Flight Research Program to Evaluate Methods of Improving Compound Helicopter Maneuver Capability. Defense Technical Information Center. https://doi.org/10.21236/ad0670942
- Blackwell, R., and T. Millott. 2008. “Dynamics Design Characteristics of the Sikorsky X2 Technology™ Demonstrator Aircraft.” In Proceedings of the Vertical Flight Society AHS 64th Annual Forum, Montréal, Québec, April 29-May 1, 2008. The Vertical Flight Society. https://doi.org/10.4050/vfs-f64-000174
- Blacodon, D., and S. Lewy. 1990. “Space-Structure Determination of the Acoustic Field Generated by a Helicopter Turboshaft Engine.” In 13th Aeroacoustics Conference. AIAA 1990-4012. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-4012
- Blaesser, Nathaniel J. 2024. Fundamental Proprotor Design Considerations. NASA/TM-20240002116. NASA. https://ntrs.nasa.gov/citations/20240002116
- Blake, Joshua D., Christopher S. Thurman, Nikolas S. Zawodny, and Leonard V. Lopes. n.d. “Broadband Predictions of Optimized Proprotors in Axial Forward Flight.” In AIAA AVIATION Forum and Exposition. https://ntrs.nasa.gov/citations/20230006072
- Bland, A. 1971. “Fan Propulsion System Influence on VTOL Transport Design.” In 7th Propulsion Joint Specialist Conference. AIAA 1971-744. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1971-744
- Bland, Samuel R., and Robert M. Bennett. 1963. Wind-Tunnel Measurement of Propeller Whirl-Flutter Speeds and Static-Stability Derivatives and Comparison with Theory. NASA-TN-D-1807. NASA. https://ntrs.nasa.gov/citations/19630009775
- Bloomfield, Warren. 1959. “The Application of Modern Shaft Turbines to VTOL Aircraft, Based on Experience with Three Different VTOL Machines.” In Proceedings of the Vertical Flight Society Forum 15 - Washington, D.C. 1959. The Vertical Flight Society. https://doi.org/10.4050/vfs-f15-013
- Bober, L., D. Chaussee, and P. Kutler. 1983. “Prediction of High Speed Propeller Flow Fields Using a Three-Dimensional Euler Analysis.” In 21st Aerospace Sciences Meeting. AIAA 1983-188. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-188
- Bober, L., and G. Mitchell. 1980. “Summary of Advanced Methods for Predicting High Speed Propeller Performance.” In 18th Aerospace Sciences Meeting. AIAA 1980-225. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-225
- Bobula, George, Richard Wayne, and Charles Watwood. 2019. “Turboshaft Engine Altitude Testing for Army Qualification.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14671
- Bodson, M., and M. Athans. 1985. “Multivariable Control of VTOL Aircraft for Shipboard Landing.” In 7th Computational Fluid Dynamics Conference. AIAA 1985-1928. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-1928
- “The Boeing Canard Rotor/wing Aircraft Begins Flight Testing.” 2004. Aircraft Engineering and Aerospace Technology 76 (2). https://doi.org/10.1108/aeat.2004.12776bab.005
- Boeing Co Morton Pa Vertol Div. 1956. Comparative Study of Various Types of VTOL Transport Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0141370
- “Boeing Flies Blended Wing Body Research Aircraft.” 2008. Aircraft Engineering and Aerospace Technology 80 (1). https://doi.org/10.1108/aeat.2008.12780aaf.003
- Böhnisch, Nils, Carsten Braun, Stephan Koschel, and Pier Marzocca. 2022. “Whirl Flutter for Distributed Propulsion Systems on a Flexible Wing.” In AIAA SCITECH 2022 Forum. AIAA 2022-1755. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-1755
- Bohorquez, Felipe, Falcon Rankins, James Baeder, and Daryll Pines. 2003. “Hover Performance of Rotor Blades at Low Reynolds Numbers for Rotary Wing Micro Air Vehicles. an Experimental and CFD Study.” In 21st AIAA Applied Aerodynamics Conference. AIAA 2003-3930. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-3930
- Boisard, Ronan. 2021. “Numerical Analysis of Rotor/Propeller Aerodynamic Interactions on a High-Speed Compound Helicopter.” Journal of the American Helicopter Society 67 (1): 1–15. https://doi.org/10.4050/jahs.67.012005
- Boldman, D. R., C. Iek, D. P. Hwang, R. J. Jeracki, and M. Larkin. 1991. Evaluation of Panel Code Predictions with Experimental Results of Inlet Performance for a 17-Inch Ducted Prop/fan Simulator Operating at Mach 0.2. AIAA PAPER 91-3354. NASA Lewis Research Center. https://ntrs.nasa.gov/citations/19910061196
- Boles, M. A., K. Ramesh, and D. P. Hwang. 1984. Analytical Study of Suction Boundary Layer Control for Subsonic V/STOL Inlets. AIAA PAPER 84-1399. North Carolina State Univ. https://ntrs.nasa.gov/citations/19840061400
- Boling, Jeremy S., Gecheng Zha, and Cale Zeune. 2020. “A High-Speed, High-Efficiency VTOL Concept Using CoFlow Jet Airfoil.” In AIAA Aviation 2020 Forum. AIAA 2020-2792. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-2792
- Bona, J. V., Iv A. T. Glinka, and V. L. Wells. 1996. “An Acoustic Methodology for Use in the Conceptual Design of Rotorcraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f52-1142
- Bondi, M. 1986. “Tiltrotor: ‘Copter and Plane in One.” Mechanical Engineering 108. https://ntrs.nasa.gov/citations/19860050827
- Bone, John R. 1988. Combat Search and Rescue: Military Stepchild. Defense Technical Information Center. https://doi.org/10.21236/ada202204
- Booth, Earl R., Jr., Megan McCluer, and Hormoz Tadghighi. 1999. “Acoustic Characteristics of a Model Isolated Tiltrotor in DNW.” In American Helicopter Society 55th Annual Forum. https://ntrs.nasa.gov/citations/20040087007
- Borst, Henry V. 1968. “Review of V/STOL Aircraft with Tilt-Propellers and Tilt-Rotors.” Aeronautical Journal 72 (693): 817–30. https://doi.org/10.1017/s0001924000085195
- Bosse, P. C., J. N. Tulino, and W. H. Wiley. 1970. “Preliminary Design and Analysis of an Advanced Convertible Fan/shaft Engine for V/STOL Tactical and Transport Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f26-032
- Bossler, Robert, and Gregory Heath. 1990. “Advanced Rotorcraft Transmission (ART) Program Status.” In Proceedings of the National Specialists Meeting on Rotary Wing Propulsion Systems - Williamsburg, Virginia 1990. The Vertical Flight Society. https://doi.org/10.4050/sm_rwp_1990-1482
- Bossler, Robert, Jr., and Gregory Heath. 1992. “Advanced Rotorcraft Transmission Program Summary.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3363. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3363
- Botelho, Leonardo Cardoso. n.d. “Attitude Stabilization and Altitude Control of a Twin-Engine Tiltrotor Aerial with Inhomogeneous Propulsion.” PhD diss., Universidade de Brasília. https://doi.org/10.26512/2025.01.d.51754
- Botha, Gavin J., Gloria K. Yamauchi, Larry A. Young, Earl R. Booth, and Seth Dawson. 1999. “Overview of the Testing of a Small-Scale Proprotor.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f55-00123
- Botre, Mrunali, Eric Greenwood, Daniel A. Wachspress, and Kenneth Steven Brentner. 2023. “Onboard Acoustic Prediction Method for VTOL Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-17957
- Bouwer, Scott, and Kevin Ignatuk. 2025a. “SB>1 DEFIANT JMR Technology Demonstrator Aircraft Main Rotor Gearbox Technology Insertions & Teardown Results.” In Proceedings of the Vertical Flight Society 81st Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0081-2025-229
- Bouwer, Scott, and Kevin Ignatuk. 2025b. “SBb1 DEFIANT JMR Technology Demonstrator Aircraft Main Rotor Gearbox Technology Insertions & Teardown Results.” In Proceedings of the Vertical Flight Society 81st Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0081-2025-0229
- Bouwer, Scott, and Eric Kaiser. 2019. “Design and Development of the Main Rotor Gearbox for the Sikorsky Boeing SB>1 DEFIANT JMR Technology Demonstrator Aircraft.” In Proceedings of the Vertical Flight Society 75th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0075-2019-14675
- Bowen, Luke, Malcolm Foster, Furqan, and Chaitanya C. Paruchuri. 2025. “Aerodynamic Design and Experimental Validation of a 1/10th Scale Notional Proprotor for a 30-Seat Tilt-Rotor eVTOL Aircraft.” In AIAA Aviation Forum and Ascend 2025. AIAA 2025-3137. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-3137
- Bowen-Davies, Graham. 2018. “Comparison of VortexWake, VVPM and CFD Aeromechanics Computations of the Boeing 222 Proprotor.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12703
- Bowen-Davies, Graham, and Inderjit Chopra. 2011. Aeromechanics of a Variable-Speed Rotor. https://doi.org/10.4050/vfs-f67-000248
- Bowen-Davies, Graham, and Inderjit Chopra. 2013. “Investigation of the UH-60A Slowed Rotor Wind Tunnel Tests Using UMARC.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-0189
- Bowen-Davies, Graham, and Inderjit Chopra. 2015. “Aeromechanics of a Slowed Rotor.” Journal of the American Helicopter Society 60 (3): 1–13. https://doi.org/10.4050/jahs.60.032011
- Bowen-Davies, Graham, and Hyeonsoo Yeo. 2017. “Performance and Loads Study of a High-Speed Compound Helicopter.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12051
- Bowen-Davies, Graham, and Hyeonsoo Yeo. 2018. “Performance and Loads Study of a High-Speed Compound Helicopter.” Journal of the American Helicopter Society 63 (3): 1–15. https://doi.org/10.4050/jahs.63.032004
- Boyd, Keith E., and Edward Murgia. 1990. “Advanced Methods of Helicopter Propulsion System Integration/air Management System Design.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f46-1012
- Boyd, Keith E., and Edward Murgia. 1995. “Advanced Methods of Helicopter Propulsion System Integration/Air Management System Design.” Journal of the American Helicopter Society 40 (1): 20–31. https://doi.org/10.4050/jahs.40.20
- Boyd, D. Douglas, Jr., and Casey L. Burley. 2001. “Analysis of Measured and Predicted Acoustics from an XV-15 Flight Test.” In American Helicopter Society 57th Forum. https://ntrs.nasa.gov/citations/20010058886
- Boyle, Fergal, Micheal O’Flaherty, and John Eaton. 1999. “Comparison of PIV Measurements with CFD Predictions for a High Speed Propeller.” In 35th Joint Propulsion Conference and Exhibit. AIAA 1999-2387. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1999-2387
- Bradfield, G. 1981. “Design Features of a Sea-Based Multipurpose V/STOL, STOVL, and STOL Aircraft in a Support Role for the U.S. Navy.” In AIAA and NASA Ames VSTOL Conference. AIAA 1981-2650. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-2650
- Bradlaugh-Dredge, T. 1986. “Propfan Test Assessment (PTA) Quick Engine Change (QEC) Nacelle.” In 22nd Joint Propulsion Conference. AIAA 1986-1626. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-1626
- Branco, David Souza, Ieuan Owen, Mark White, and Neale A. Watson. 2025. “Hospital Landing Site Safety: A CFD Study of Rotor Downwash and Turbulent Airwake Effects.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0084
- Brand, A. G., N. M. Komerath, and H. M. McMahon. 1986. Wind Tunnel Data from a Rotor Wake/Airframe Interaction Study. Defense Technical Information Center. https://doi.org/10.21236/ada171333
- Brand, Albert G., Martin A. Peryea, Tom L. Wood, and Robert L. Meakin. 2001. Flowfield and Download Measurements and Computation of a Tiltrotor Aircraft in Hover. Bell Helicopter Co. https://ntrs.nasa.gov/citations/20010117310
- Branum, Lonnie, and Chee Tung. 1990. “Model Tilt-Rotor Hover Performance and Surface Pressure Measurement.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f46-2004
- Bray, Derek. 1995. “Tactical Tilt-Rotor Transport Aircraft Design.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f51-2034
- Brender, Scott, Hans Mark, and Frank Aguilera. 1996. The Attributes of a Variable-Diameter Rotor System Applied to Civil Tiltrotor Aircraft. NASA-CR-203092. NASA. https://ntrs.nasa.gov/citations/19970005490
- Breul, Harry T. 1963. A Simulator Study of Tilt-Wing Handling Qualities. Defense Technical Information Center. https://doi.org/10.21236/ad0402774
- Brewer, Roy, Frank Conway, and Ray Mulato. 2017. “Development and Evaluation of New High-Speed ADS-33 Mission Task Elements Using a Tiltrotor Platform.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12067
- Briardy, F. J., S. V. LaForge, and J. R. Neff. 1970. ROTOR/WING. Defense Technical Information Center. https://doi.org/10.21236/ad0710425
- Bridgeman, John O., Devon Prichard, and Francis X. Caradonna. 1991. “The Development of a CFD Potential Method for the Analysis of Tilt-Rotors.” In In: AHS and Royal Aeronautical Society, Technical Specialists’ Meeting on Rotorcraft Acoustics(Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings (A93-29401 10-71). https://ntrs.nasa.gov/citations/19930045437
- Bridgnell, D., and F. M. Walters. 1962. Development of Recuperator 178620-1 Turboshaft Gas Turbine Aircraft Engines. Defense Technical Information Center. https://doi.org/10.21236/ad0408489
- Brieger, John T., Lawrence E. Becker, Charles D. Smith, David A. Conner, and Michael A. Marcolini. 1995. “Noise Characteristics of a Model Tiltrotor.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f51-2026
- Brieger, John T., Bryan Edwards, Michael A. Marcolini, and David A. Conner. 1997. “XV-15 Tiltrotor Low Noise Terminal Area Operations.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f53-102
- Brieger, John T., Sandy R. Liu, and Martin Peryea. 1998. “Model Tiltrotor Flow Field/turbulence Ingestion Noise Experiment and Prediction.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f54-00088
- Brieger, John T., Martin D. Maisel, and Ronald M. Gerdes. 1987. External Noise Evaluation of the XV-15 Tiltrotor Aircraft. https://doi.org/10.4050/sm_aero_1987-2708
- Brogan, E., G. Casey, B. Engel, et al. 1961. Vertodyne Fan-in-Wing VTOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0265569
- Brooks, A. 1979a. “The Impact of Contingency Ratings on Advanced Turboshaft Engine Design.” In Proceedings of the Specialists Meeting on Helicopter Propulsion Systems, Williamsburg, Virginia, November 1979. The Vertical Flight Society. https://doi.org/10.4050/sm_prop_1979-4566
- Brooks, A. 1979b. “The Impact of Contingency Ratings on Advanced Turboshaft Engine Design.” Journal of the American Helicopter Society 26 (3): 1–24. https://doi.org/10.4050/jahs.26.20
- Brooks, A. 1979c. The T700 Booster Engine. https://doi.org/10.4050/sm_prop_1979-4635
- Brooks, A., and K. L. Abdalla. 1982. TF34 Convertible Engine System Technology Program. https://doi.org/10.4050/vfs-f38-016
- Brooks, B., and K. Mackall. 1984. “Measurement and Analysis of Acoustic Flight Test Data for Two Advanced Design High Speed Propeller Models.” In 22nd Aerospace Sciences Meeting. AIAA 1984-250. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-250
- Brown, E. 1965. “A Survey of Low-Disc-Loading VTOL Aircraft Designs.” In Aircraft Design and Technology Meeting. AIAA 1965-756. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1965-756
- Brown, H. 1981. “V/STOL Propulsion Control Technology.” In V/STOL Conference. https://ntrs.nasa.gov/citations/19820033374
- Brown, Gerald, and Vivek Ahuja. 2023a. “The Stopped Rotor Concept: A New Look at an Old Idea.” In Proceedings of the Vertical Flight Society 79th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0079-2023-17960
- Brown, Gerald, and Vivek Ahuja. 2023b. “The Stopped Rotor: A New Look at an Old Idea.” In Proceedings of the Vertical Flight Society 79th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0079-2023-0078
- Brown, Ross K., Lawrence M. Corso, Raymond G. Kvaternik, et al. 2003. “Aeroelastic Stability of a Four-Bladed Semi-Articulated Soft-Inplane Tiltrotor Model.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f59-000110
- Brown, Nate, Jeff Demo, and Gregory F. Heath. 2015a. Multifunctional Lubrication Monitoring System for Rotorcraft Propulsion and Drives. https://doi.org/10.4050/sm_prop_2015-3546
- Brown, J. H., and H. Kipling Edenborough. 1977. “Status Report on XV-15 Tilt Rotor Test Program.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f33-039
- Brown, James H., H. Kipling Edenborough, and David D. Few. 1977. “XV-15 Tilt Rotor Test Progress Report.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/770953
- Brown, E., and J. Fischer. 1967. “Comparative Projections of Helicopters, Compound Helicopters and Tilting-Proprotor Low- Disc-Loading VTOL Aircraft for Civil Applications.” In 4th Annual Meeting and Technical Display. AIAA 1967-939. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1967-939
- Brown, Bryan, Wei Wei, Rodger Ozburn, Manish Kumar, and Kelly Cohen. 2015b. “Surveillance for Intelligent Emergency Response Robotic Aircraft (SIERRA)- VTOL Aircraft for Emergency Response.” In AIAA Infotech @ Aerospace. AIAA 2015-0363. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-0363
- Brown, Richard E., and Glen R. Whitehouse. 2003. “Helicopter Rotor Response to Wake Encounters in Ground Effect.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f59-000050
- Brown, Richard E., and Glen R. Whitehouse. 2004. “Modelling Rotor Wakes in Ground Effect.” Journal of the American Helicopter Society 49 (3): 238–49. https://doi.org/10.4050/jahs.49.238
- Brown, J. H., Jr., H. K. Edenborough, and K. G. Wernicke. 1978. “Evaluation of the Tilt Rotor Concept: The XV-15’s Role.” In AGARD Rotorcraft Design. https://ntrs.nasa.gov/citations/19780011199
- Browne, Jacob L., Paul C. Setze, and Robert C. Turnbull. 1971. “VTOL Propulsion System Development.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f27-033
- Brunson, S., and M. Rais-Rohani. 1996. “A Thin Tailored Composite Wing Box for a Civil Tiltrotor Transport Aircraft.” In 37th Structure, Structural Dynamics and Materials Conference. AIAA 1996-1378. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1996-1378
- Brynn, Edward P., and Arthur P. Geesey. 1976. Project CHECO Southeast Asia Report. Joint Personnel Recovery in Southeast Asia. Defense Technical Information Center. https://doi.org/10.21236/ada490689
- Bryson, A., Jr., W. Hoffman, and J. Zvara. 1970. “An Automatic Guidance Concept for VTOL Aircraft.” In Astrodynamics Conference. AIAA 1970-1035. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1970-1035
- Bryson, A. E., Jr., and R. K. Mehra. 1967. Conjugate Gradient Methods with an Application to V/STOL Flight-Path Optimization. NASA-CR-91880. NASA. https://ntrs.nasa.gov/citations/19680007007
- Bryson, A. E., Jr., and R. K. Mehra. 1969. Conjugate Gradient Methods with an Application to V/STOL Flight-Path Optimization. NASA. https://ntrs.nasa.gov/citations/19690048774
- Bucciaglia, Giuseppe, Andrea Duina, and Davide Prederi. 2023a. “Correlation and Accuracy Quantification of Proprotor Loads between Predictions of Comprehensive Aeroelastic Software and Experimental Data.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18033
- Bucciaglia, Giuseppe, Davide Prederi, and Andrea Duina. 2023b. “Lichten Runner-up Paper: Correlation and Accuracy Quantification of Proprotor Loads between Predictions of Comprehensive Aeroelastic Software and Experimental Data.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-0091
- Bühler, M., and S. J. Newman. 1996. “The Aerodynamics of the Compound Helicopter Configuration.” Aeronautical Journal 100 (994): 111–20. https://doi.org/10.1017/s0001924000027391
- Builta, Kenneth E., R. L. Fortenbaugh, and Kynn J. Schulte. 1995. “Development and Testing of Flying Qualities for Manual Operation of a Tiltrotor UAV.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f51-1023
- Burguburu, Stephane, and Pierre-Marie Basset. 2012. “Turboshaft Engine Predesign and Performance Assessment.” In 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. AIAA 2012-3813. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2012-3813
- Burks, J. 1981. “Rotor Systems Research Aircraft /RSRA/ Rotor Force and Moment Measurement System.” In 1st Flight Test Conference. AIAA 1981-2516. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-2516
- Burlein, Mike, Devol Brett, and Robert B. Mohan. 2002. Improving Personnel Recovery in a Coalition Environment. Defense Technical Information Center. https://doi.org/10.21236/ada406322
- Burley, Casey L., Thomas F. Brooks, Bruce D. Charles, and Megan McCluer. 1999. “Tiltrotor Aeroacoustic Code (TRAC) Prediction Assessment and Initial Comparisons with Tram Test Data.” In 25th European Rotorcraft Forum. https://ntrs.nasa.gov/citations/20040086961
- Burley, Casey L., Thomas F. Brooks, Berend vanderWall, et al. 2003. “Rotor Wake Vortex Definition Using 3C-PIV Measurements: Corrected for Vortex Orientation.” In American Inst. of Aeronautics and Astronautics. https://ntrs.nasa.gov/citations/20030065913
- Burrage, B. 2013. “Figure of Merit of Meshing Rotors: Blade Twist, Rotor Overlap and Cant.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-0228
- Burton, Samantha, Tianyi He, and Weihua Su. 2026. “Trajectory Planning of Longitudinal Transition Flight and Quasi-Linear Parameter-Varying-Model Predictive Control Tracking Control for Tilt-Rotor VTOL Aircraft.” Journal of Dynamic Systems, Measurement, and Control 148 (4): 041002. https://doi.org/10.1115/1.4070771
- Busan, Ronald C., Patrick C. Murphy, David B. Hatke, and Benjamin M. Simmons. 2021. “Wind Tunnel Testing Techniques for a Tandem Tilt-Wing, Distributed Electric Propulsion VTOL Aircraft.” In AIAA Scitech 2021 Forum. AIAA 2021-1189. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-1189
- Bushgens, Andrei Georgievich, Aleksandr Yurievich Voronin, Vladimir Mikhailovich Kuvshinov, and Veniamin Aleksandrovich Leontiev. 2018. “Design of Control System Algorithms for Unmanned Tiltrotor.” TsAGI Science Journal 49 (2): 149–74. https://doi.org/10.1615/tsagiscij.2018027091
- Bussichella, Joe. 2003. Rotorcraft Future Propulsion Needs Propulsion Technology. https://doi.org/10.4050/sm_prop_2003-4154
- Butler, J. E., and G. F. Thomas. 1964. Rapid Site Preparation for Turbojet VTOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0613342
- Byrnes, J., R. Murphy, R. Ball, et al. 1974. “V/STOL Demonstrator Vehicle for Ejector Thrust Augmentation Technology.” In 6th Aircraft Design,Flight Test and Operations Meeting. AIAA 1974-995. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1974-995
- Cabarbaye, Aurélien. n.d. “Design, Model and Control of a New Type of VTOL Aircraft.” PhD diss., Toulouse, ISAE. https://doi.org/10.70675/142832fez8c1cz4237z83b9z89d813801148
- Cai, Guowei, Adnan Saeed, Ahmad B. Younes, Tarek Taha, Jorge Dias, and Lakmal Seneviratne. 2016. “First-Principles Modeling of a Miniature Tilt-Rotor Convertiplane in Low-Speed Operation.” In AIAA Modeling and Simulation Technologies Conference. AIAA 2016-3222. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-3222
- Cakin, Ugur, Zafer Kaçan, Zeynel Abidin Aydogan, and Ipek Kuvvetli. 2020. “Initial Sizing of Hybrid Electric VTOL Aircraft for Intercity Urban Air Mobility.” In AIAA Aviation 2020 Forum. AIAA 2020-3173. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-3173
- Caldwell, D., and S. Lafavor. 1980. “V/STOL Fighter-Attack Aircraft in Naval Operations.” In Aircraft Systems Meeting. AIAA 1980-1810. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-1810
- Caldwell, Niall, David Rancourt, Peter McCurry, and Uwe Stein. 2021. “Digital Displacement Hydrostatic Transmission for Rotorcraft and Distributed Propulsion.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16890
- Calise, A. J., and R. Rysdyk. 1996. Research in Nonlinear Flight Control for Tiltrotor Aircraft Operating in the Terminal Area. NASA-CR-203112. NASA. https://ntrs.nasa.gov/citations/19970007336
- Calise, Anthony J., and Rolf T. Rysdyk. 1998. “Adaptive Model Inversion Flight Control for Tiltrotor Aircraft.” In Proceedings of the Vertical Flight Society Forum 54 - Washington, D.C. 1998. The Vertical Flight Society. https://doi.org/10.4050/vfs-f54-00001
- Calise, Anthony, Rolf Rysdyk, Anthony Calise, and Rolf Rysdyk. 1997. “Adaptive Model Inversion Flight Control for Tiltrotor Aircraft.” In Guidance, Navigation, and Control Conference. AIAA 1997-3758. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1997-3758
- Calvert, Mark E., and Yonghu Wenren. 2019. “Rotorcraft Outwash and Human Stability.” In AIAA Scitech 2019 Forum. AIAA 2019-1095. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1095
- Campbell, John P. 1959. “Research on VTOL and STOL Aircraft in the United States.” In Advances in Aeronautical Sciences. Elsevier. https://doi.org/10.1016/b978-1-4831-9833-0.50014-1
- Campbell, J. P. 1963. Status of V/STOL Research and Development in the United States. AIAA PAPER 63-482. NASA. https://ntrs.nasa.gov/citations/19630027849
- Campbell, J. P. 1964. Status of V/stol Research and Development in the United States. AIAA PAPER 63-482. NASA. https://ntrs.nasa.gov/citations/19650031242
- Campbell, J. P. 1965. Operating Problems Peculiar to V/stol and Stol Aircraft. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19650021528
- Campbell, J. P. 1967. V/STOL Session Introductory and Review Paper. NASA-TM-X-59740. NASA. https://ntrs.nasa.gov/citations/19680016407
- Campbell, J. P. 1968. V/STOL Session Introductory and Review Paper. NASA. https://ntrs.nasa.gov/citations/19690037574
- Campbell, D., and B. Quinn. 1973. “Full-Scale Tests of an Augmentor VTOL Concept.” In 9th Propulsion Conference. AIAA 1973-1185. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1973-1185
- “The Canadair CL-84 Experimental Aircraft: Lessons Learned.” 1990. In Aircraft Design, Systems and Operations Conference. AIAA 1990-3205. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3205
- Cao, Yihua. 1999. “A New Method for Predicting Rotor Wake Geometries and Downwash Velocity Field.” Aircraft Engineering and Aerospace Technology 71 (2): 129–35. https://doi.org/10.1108/00022669910261574
- Cao, Fei F., Ming Chen, and Mei Li Wen Wu. 2016. “Conceptual Design for the Performance Optimization of Compound Coaxial Helicopter.” Applied Mechanics and Materials 826: 40–44. https://doi.org/10.4028/www.scientific.net/amm.826.40
- Cao, Yihua, and Qi Qi. 2018. “Trims, Controllability, and Flying Qualities of a Tilt-Rotor Aircraft Slung-Load System.” Journal of Aerospace Engineering 31 (2): 06017006. https://doi.org/10.1061/(asce)as.1943-5525.0000803
- Cao, Xiaoying, Gilles Roy, Simon Roy, and Evan Trickey. 2012. “Assessment of Helicopter Brownout with a Scanning Lidar.” In Conference on Lasers and Electro-Optics 2012. OSA. https://doi.org/10.1364/cleo_at.2012.atu2g.5
- Cao, Yihua, and Yuan Su. 2003. “Insight into the Effects of Rotor Downwash on Engine Jet.” Aircraft Engineering and Aerospace Technology 75 (4): 345–49. https://doi.org/10.1108/00022660310484266
- Cao, Y., and M. M. Wang. 2026. “Aerodynamic Interactions between the Propeller and Other Components in a Coaxial Compound Helicopter.” Journal of Applied Fluid Mechanics 19 (8). https://doi.org/10.47176/jafm.19.8.4200
- Cao, Yu Yan, Xin Min Wang, and Cheng Peng. 2014. “Self-Scheduled and Robust Control for Tilt Rotor Aircraft.” Applied Mechanics and Materials 721: 210–13. https://doi.org/10.4028/www.scientific.net/amm.721.210
- Capitao Patrao, Alexandre, Daniel Lindblad, and Tomas Grönstedt. 2018. “Aerodynamic and Aeroacoustic Comparison of Optimized High-Speed Propeller Blades.” In 2018 Joint Propulsion Conference. AIAA 2018-4658. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-4658
- Caprace, Denis-Gabriel, Ethan Baker, Patricia Ventura Diaz, and Seokkwan Yoon. 2024. “Comparing Planetary Helicopter Brownout Observations with Numerical Predictions for Ingenuity.” In AIAA Aviation Forum and Ascend 2024. AIAA 2024-4341. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-4341
- Carcel, Cristobal Ruiz, Andrew G. Starr, and Arturo Francese. 2022. “Experimental Assessment of a Broadband Vibration and Acoustic Emission Sensor for Rotorcraft Transmission Monitoring.” PHM Society European Conference 7 (1): 440–48. https://doi.org/10.36001/phme.2022.v7i1.3368
- Carico, Dean, and Singli Garcia-Otero. 1995. Tilt Rotor Aircraft Modeling Using a Generic Simulation Structure,. Defense Technical Information Center. https://doi.org/10.21236/ada305253
- Carlson, R., and B. Maopolski. 1969. “Rotor Dynamics of a Single Stowed Rotor Aircraft.” In VTOL Research, Design, and Operations Meeting. AIAA 1969-207. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-207
- Carlson, John R., and Odis C. Pendergraft Jr. 1987. An Experimental Investigation of an Advanced Turboprop Installation on a Swept Wing at Subsonic and Transonic Speeds. NASA-TP-2729. NASA. https://ntrs.nasa.gov/citations/19870017450
- Carlson, J., O. Pendergraft Jr., and G. Bartlett. 1985. “Comparison of Advanced Turboprop Installation on Swept and Unswept Supercritical Wings at Transonic Speeds.” In 21st Joint Propulsion Conference. AIAA 1985-1264. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-1264
- Carlson, Eric B., and Yiyuan J. Zhao. 2004. “Optimal City-Center Takeoff Operation of Tiltrotor Aircraft in One Engine Failure.” Journal of Aerospace Engineering 17 (1): 26–39. https://doi.org/10.1061/(asce)0893-1321(2004)17:1(26)
- Carlson, Eric, Yiyuan Zhao, and Robert Chen. 1999. “Optimal Tiltrotor Runway Operations in One Engine Inoperative.” In Guidance, Navigation, and Control Conference and Exhibit. AIAA 1999-3961. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1999-3961
- Carpenter, Paul J., and Russell S. Paulnock. 1949. Hovering and Low-Speed Performance and Control Characteristics of the Kaman Helicopter Rotor System as Determined on the Langley Helicopter Tower. TED No. NACA DE 205. NACA-RM-SL9I27. National Advisory Committee for Aeronautics. Langley Aeronautical Lab. https://ntrs.nasa.gov/citations/20090026503
- Carter, Arthur W. 1969. Effects of Jet Exhaust Longitudinal Aerodynamic Characteristics of a Jet V/STOL Model. NASA-TN-D-5333. NASA. https://ntrs.nasa.gov/citations/19690023832
- Carter, Ryan, Timothy M. Keeter, and Paul Calhoun. 2024. “Airborne Recovery of the X-61A Gremlin Unmanned Aircraft.” In AIAA SCITECH 2024 Forum. AIAA 2024-0570. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-0570
- Carter, Jay, Jr. 2004. The Carter Heliplane Transport Slowed Rotor/Compound Aircraft: Candidate for the Air-Maneuver Transport (AMT). https://doi.org/10.4050/vfs-f60-000121
- Casablanca, Manuel, Andrea Magrini, Francesco De Vanna, and Ernesto Benini. 2025. “A Comparative Investigation of Tip-Loss and Compressibility Correlations for Blade Element Momentum Theory Propeller Performance Analysis.” In European Conference on Turbomachinery Fluid Dynamics and Thermodynamics. European Turbomachinery Society. https://doi.org/10.29008/etc2025-161
- Cassinelli, Carlo, Pierre Abdel Nour, Gianni Bernini, et al. 2023. “Experimental Aerodynamics Validation of a Tiltrotor Platform within Next Generation Tiltrotor Technology Demonstrator Project.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18003
- Cassoni, G. 2023. “Tiltrotor Whirl-Flutter Stability Analysis Using the Maximum Lyapunov Characteristic Exponent Estimated from Time Series.” In Materials Research Proceedings, vol. 37. Materials Research Forum LLC. https://doi.org/10.21741/9781644902813-7
- Čečrdle, Jiří. 2015a. “Analytical Methods for Whirl Flutter Investigation.” In Whirl Flutter of Turboprop Aircraft Structures. Elsevier. https://doi.org/10.1533/9781782421863.81
- Čečrdle, Jiří. 2015b. “Experimental Research on Whirl Flutter.” In Whirl Flutter of Turboprop Aircraft Structures. Elsevier. https://doi.org/10.1533/9781782421863.41
- Čečrdle, Jiří. 2015c. “Introduction to Aircraft Aeroelasticity and Whirl Flutter.” In Whirl Flutter of Turboprop Aircraft Structures. Elsevier. https://doi.org/10.1533/9781782421863.1
- Čečrdle, Jiří. 2015d. “Theoretical Background of Whirl Flutter Phenomenon.” In Whirl Flutter of Turboprop Aircraft Structures. Elsevier. https://doi.org/10.1533/9781782421863.13
- Čečrdle, Jiří. 2015e. “Whirl Flutter Occurrence in Aerospace Practice.” In Whirl Flutter of Turboprop Aircraft Structures. Elsevier. https://doi.org/10.1533/9781782421863.33
- Cecrdle, Jiri. 2016. “Application of Whirl Flutter Optimization-Based Solution to Full-Span Model of Twin Turboprop Aircraft.” In Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016). Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece. https://doi.org/10.7712/100016.2035.6754
- Čečrdle, Jiří. 2018. “Aeroelastic Stability of Turboprop Aircraft: Whirl Flutter.” In Flight Physics - Models, Techniques and Technologies. InTech. https://doi.org/10.5772/intechopen.70171
- Čečrdle, Jiří. 2023a. “Analytical Methods for Whirl Flutter Investigation.” In Whirl Flutter of Turboprop Aircraft Structures. Elsevier. https://doi.org/10.1016/b978-0-323-95555-3.00004-4
- Čečrdle, Jiří. 2023b. “Experimental Research into Whirl Flutter.” In Whirl Flutter of Turboprop Aircraft Structures. Elsevier. https://doi.org/10.1016/b978-0-323-95555-3.00012-3
- Čečrdle, Jiří. 2023c. “Introduction to Aircraft Aeroelasticity and Whirl Flutter.” In Whirl Flutter of Turboprop Aircraft Structures. Elsevier. https://doi.org/10.1016/b978-0-323-95555-3.00009-3
- Čečrdle, Jiří. 2023d. “Theoretical Background of Whirl Flutter Phenomenon.” In Whirl Flutter of Turboprop Aircraft Structures. Elsevier. https://doi.org/10.1016/b978-0-323-95555-3.00002-0
- Čečrdle, Jiří. 2023e. “Whirl Flutter Occurrence in Aerospace Practice.” In Whirl Flutter of Turboprop Aircraft Structures. Elsevier. https://doi.org/10.1016/b978-0-323-95555-3.00008-1
- Cecrdle, Jiri, and Jaromir Malecek. 2014a. “Design and Development of New Whirl Flutter Aeroelastic Demonstrator.” In 55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2014-0678. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2014-0678
- Cecrdle, Jiri, and Jaromir Malecek. 2014b. “Mechanical Concept of W-WING Whirl Flutter Aeroelastic Demonstrator.” Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 229 (8): 1485–94. https://doi.org/10.1177/0954410014554473
- Cecrdle, Jiri, Jaromir Malecek, Ondrej Vich, and Petr Malinek. 2015. “Preparatory Analyses and Tests of W-WING Whirl Flutter Demonstrator.” In 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2015-1858. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1858
- Cecrdle, Jiri, Jaromir Malecek, Ondrej Vich, and Petr Malinek. 2016. “Development and Wind Tunnel Test of W-WING Whirl Flutter Aeroelastic Demonstrator.” In 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2016-1961. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-1961
- Cecrdle, Jiri, Petr Malinek, and Ondrej Vich. 2017. “Wind Tunnel Tests of Whirl Flutter Aeroelastic Demonstrator.” In 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2017-0635. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-0635
- Čečrdle, J., P. Malínek, and O. Vích. 2025. “Experimental Investigation into Whirl Flutter Using W-Wing Aeroelastic Demonstrator in 2024.” In Engineering Mechanics. Institute of Theoretical and Applied Mechanics, Czech Academy of Sciences, Prague. https://doi.org/10.21495/em2025-49
- Čečrdle, J., O. Vích, J. Stárek, J. Vlach, M. Kolář, and M. Šmíd. 2024. “New Design and Upgrade of Whirl Flutter Aeroelastic Demonstrator.” In Engineering Mechanics. Institute of Solid Mechanics, Mechatronics and Biomechanics, Brno University of Technology, Brno. https://doi.org/10.21495/em2024-066
- Celniker, L., I. H. Culver, and P. W. Theriault. 1964. “Considerations Relative to Stopping a Rotor in Forward Flight.” In Proceedings of the Vertical Flight Society Forum 20 - Washington, D.C. 1964. The Vertical Flight Society. https://doi.org/10.4050/vfs-f20-008
- Chakraborty, Imon, Bikash Kunwar, and Peter Schmidt. 2025. “A Maneuver Control System Enabling Simplified Vehicle Operations and Tactical Maneuvering for a Tilt-Wing Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0406
- Chakraborty, Imon, Noah S. Miller, and Aashutosh A. Mishra. 2022. “Sizing and Analysis of a Tilt-Wing Aircraft with All-Electric and Hybrid-Electric Propulsion Systems.” In AIAA SCITECH 2022 Forum. AIAA 2022-1515. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-1515
- Chakraborty, Imon, and Aashutosh A. Mishra. 2022. “Sizing and Analysis of a Lift-Plus-Cruise VTOL Aircraft with Electrified Propulsion Systems.” In AIAA AVIATION 2022 Forum. AIAA 2022-3513. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-3513
- Chalmers, Jennifer. n.d. “Design and Validation of an Experiment for the Detection and Prediction of Stall and Surge in a PT6/T400 Turboshaft Engine.” PhD diss., Carleton University. https://doi.org/10.22215/etd/2006-08102
- Chalmers, Jennifer L. Y., Jeff W. Bird, and Donald Gauthier. 2007. “Design and Validation of an Experiment for the Detection and Prediction of Stall and Surge in a PT6/T400 Turboshaft Engine.” In Volume 6: Turbo Expo 2007, Parts A and B. ASMEDC. https://doi.org/10.1115/gt2007-28244
- Chambers, J. R. 1971. Stability and Control Characteristics of STOL and V/STOL Airplanes. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19710015226
- Chambers, H. A. 1991. “Turboshaft Engine Development for Commercial Tiltrotor Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/911017
- Chambers, J. R., and S. B. Grafton. 1966. Static and Dynamic Longitudinal Stability Derivatives of a Powered 1/9-Scale Model of a Tilt-Wing V/STOL Transport. NASA-TN-D-3591. NASA. https://ntrs.nasa.gov/citations/19660027742
- Chambers, J. R., and S. B. Grafton. 1970. Investigation of Lateral-Directional Dynamic Stability of a Tilt-Wing V/STOL Transport. NASA-TN-D-5637. NASA. https://ntrs.nasa.gov/citations/19700008731
- Chambers, F., N. Reddy, and H. Bartel. 1989. “Lateral Noise Attenuation of the Advanced Propeller of the Propfan Test Assessment Aircraft.” In 12th Aeroacoustic Conference. AIAA 1989-1057. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-1057
- Champine, R. 1971. “Flight Investigation of a Tilt-Wing VTOL Aircraft in the Terminal Area under Simulated Instrument Conditions.” In 9th Aerospace Sciences Meeting. AIAA 1971-7. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1971-7
- Champion-Reaud, Jean-Louis. 2023. “First Measurements on BEARCAT, the SAFRAN’s Heavily Instrumented Turboshaft.” In AIAA SCITECH 2023 Forum. AIAA 2023-1936. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1936
- Chan, Keen. 2017. “Generalized Aerodynamic Optimization of Hovering Coaxial Rotor Blades.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-11992
- Chan, Keen. 2019. “Asymmetric Distributed Electric Propulsion VTOL Flying Wing: Conceptualization, Design and Flight Test.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14541
- Chana, William. 2002. “Early 21st Century Executive VTOL Aircraft.” In 2002 Biennial International Powered Lift Conference and Exhibit. AIAA 2002-5996. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-5996
- Chana, William F., and Taylor Sullivan. 1992. “The Tilt Wing Advantage: For High Speed VSTOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/921911
- Chana, William F., and T. M. Sullivan. 1993. “The Tilt Wing Design for a Family of High Speed VSTOL Aircraft.” In Proceedings of the Vertical Flight Society Forum 49 - St. Louis, MO 1993. The Vertical Flight Society. https://doi.org/10.4050/vfs-f49-2018
- Chance Vought Corp Dallas Tx. 1979. V/STOL Aircraft Design Sensitivity to Flying Qualities Criteria Study. Defense Technical Information Center. https://doi.org/10.21236/ada358711
- Chandrasekaran, B., and G. Bartlett. 1983. “Method for Calculating Effects of a Propfan on Aircraft Aerodynamicsat Subsonic Speeds.” In 19th Joint Propulsion Conference. AIAA 1983-1216. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-1216
- Chandrasekaran, Ruthvik, and Dewey H. Hodges. 2021. “Performance Advantages and Resonance Analysis of a Variable Speed Rotor Using Geometrically Exact Beam Formulations.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16768
- Chandrasekaran, Ruthvik, and Dewey H. Hodges. 2022. “Performance Advantages and Resonance Analysis of a Variable Speed Rotor Using Geometrically Exact Beam Formulations.” Journal of the American Helicopter Society 67 (4): 1–21. https://doi.org/10.4050/jahs.67.042006
- Chang, Jasmine C., and Carlos Cesnik. 2025. “Analytical Linearization of the Viscous Vortex Particle Method for Whirl Flutter Prediction.” In AIAA SCITECH 2025 Forum. AIAA 2025-0431. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-0431
- Chang, Jasmine C., and Carlos E. S. Cesnik. 2026. “Coupled Linearized Unsteady Vortex Lattice Method and Viscous Vortex Particle Method for Whirl Flutter Prediction.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0113
- Chang, Jasmine C., Carlos E. S. Cesnik, and Divya Sanghi. 2024. “Wing and Propeller Aerodynamic Interaction Effects on Whirl Flutter Instability.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1330
- Chao, Li, Bin Guangfu, Li Jian, and Wang Weimin. 2022. “Influence of Sand Particle Size on the Erosive Wear of Compressor Blade in an Aero-Turboshaft Engine.” Journal of Mechanical Engineering 58 (19): 180. https://doi.org/10.3901/jme.2022.19.180
- Chao, Pang, and Gao Zhenghong. 2019. “CFD Simulation of Unsteady Interaction between Rotor and Fuselage for Canard Rotor Wing in Hovering Using Overset Grids.” Journal of Physics: Conference Series 1215 (1): 012008. https://doi.org/10.1088/1742-6596/1215/1/012008
- Chapman, Jeffryes W. 2019. “Multi-Point Design and Optimization of a Turboshaft Engine for Tiltwing Turboelectric VTOL Air Taxi.” In AIAA Scitech 2019 Forum. AIAA 2019-1948. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1948
- Chapman, D., R. Fleury, and D. Smith. 1989. “Testing of the 578-DX Propfan Propulsion System.” In 25th Joint Propulsion Conference. AIAA 1989-2581. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2581
- Chapman, D., J. Godston, and D. Smith. 1988. “Testing of the 578-DX Propfan Propulsion System.” In 24th Joint Propulsion Conference. AIAA 1988-2804. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-2804
- Chapman, D., G. Sevich, and D. Smith. 1987. “Preparing a Propfan Propulsion System for Flight Test.” In 23rd Joint Propulsion Conference. AIAA 1987-1731. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-1731
- Chapman, Jeffryes W., Michael Vegh, Christopher Snyder, and Gerardo Nuñez. 2023. “Modeling Turboshaft Engines for the Revolutionary Vertical Lift Technology Project, Expanded.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18141
- Charnov, Bruce H. 2006. “A Critical Re-Examination of the Franklin Institute Rotating Wing Aircraft Meeting of October 28 – 29, 1938: Facts and Myths Surrounding the Foundations of Autogiro/Convertiplane/Helicopter Development in America and Europe.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f62-125
- Charnov, Bruce H. 2007. “Gerard Post Herrick (1873 – 1955) America’s Unforgettable “Forgotten” Convertiplane Pioneer.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f63-000056
- Chase, Ned A. 2015. Future Vertical Lift Overview. https://doi.org/10.4050/sm_prop_2015-2875
- Chattopadhyay, Aditi, Thomas R. McCarthy, and John Rajadas. 1997. “Multidisciplinary Optimization of Tilt Rotor Blades Using Comprehensive Composite Modeling Technique.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f53-166
- Chattopadhyay, Aditi, Thomas R. McCarthy, and Sen Zhang. 1995. “A Coupled Rotor/Wing Optimization Procedure for High Speed Tilt-Rotor Aircraft.” In Proceedings of the Vertical Flight Society Forum 51 - Ft. Worth, TX 1995. The Vertical Flight Society. https://doi.org/10.4050/vfs-f51-2003
- Chavez, Andrea, Treven Baker, and Jason R. Fetty. 2017. “Future Advanced Rotorcraft Drive System (FARDS) Full Scale Gearbox Demonstration.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12152
- Cheatham, J. G., and T. L. Creason. 1983. V/STOL Model Fan Stage Rig Design Report. NASA-CR-174688. NASA. https://ntrs.nasa.gov/citations/19840015561
- Cheeseman, I. 1967. “Circulation Control and Its Application to Stopped Rotor Aircraft.” In 10th Anglo-American Aeronautical Conference. AIAA 1967-747. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1967-747
- Cheeseman, I. C. 1968. “Circulation Control and Its Application to Stopped Rotor Aircraft.” Aeronautical Journal 72 (691): 635–46. https://doi.org/10.1017/s0001924000084803
- Chen, Shih. 1989. “Prediction of Periodic Loadings on Single Rotation Propfan with off-Axis Inflow.” In 25th Joint Propulsion Conference. AIAA 1989-2694. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2694
- Chen, Yih-Jen D. 1991. Parametric Study of the Gear Blank Structure in Helicopter Transmission Design. https://doi.org/10.4050/sm_struct_1991-3797
- Chen, Geoffrey. 2019a. “Development of a Probability of Hover Analysis Capability to Support Rotorcraft Conceptual Design.” In Proceedings of the Vertical Flight Society 75th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0075-2019-14653
- Chen, Kaixiang. 2023. “Controller Design for Transition Flight of Rotor-Driven VTOL Fixed-Wing UAV Based on PID.” Applied and Computational Engineering 9 (1): 15–21. https://doi.org/10.54254/2755-2721/9/20230018
- Chen, Mingtai. 2025. “Rotor-Wing Interaction in Urban Air Mobility Tiltrotors.” In Innovations and Developments in Unmanned Aerial Vehicles. IGI Global Scientific Publishing. https://doi.org/10.4018/979-8-3693-8462-6.ch015
- Chen, Robert T. N., Eric B. Carlson, and Yiyuan J. Zhao. 1998. “Optimal Trajectories for Tiltrotor Aircraft in Total Power Failure.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f54-00093
- Chen, Hao, and Bo Chen. 2021. “Aerodynamic Performance Enhancement of Tiltrotor Aircraft Wings Using Double-Row Vortex Generators.” International Journal of Aeronautical and Space Sciences 22 (4): 802–12. https://doi.org/10.1007/s42405-020-00346-8
- Chen, Peter, and Inderjit Chopra. 1995. “Hover Testing of a Smart Rotor with Induced-Strain Actuation of Blade Twist.” In 36th Structures, Structural Dynamics and Materials Conference. AIAA 1995-1097. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1995-1097
- Chen, Mingtai, Darnisha Cranes, and James P. Hubner. 2019b. “Experimental Investigation of Rotor-Wing Interaction at Low Disk Loading and Low Reynolds Number.” In AIAA Aviation 2019 Forum. AIAA 2019-3034. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-3034
- Chen, Y. D., R. Gilbert, G. Heath, and Valdez Rupa Sheth. 1995. “Advanced Rotorcraft Transmission Development: A Technology Reconversion Program.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f51-2038
- Chen, Zhuoqun, and Runzhao Guo. 2025. “Discussion on Rotor Design Schemes for Tiltrotor Aircraft in Hovering State.” Journal of Physics: Conference Series 3169 (1): 012037. https://doi.org/10.1088/1742-6596/3169/1/012037
- Chen, Mingtai, Jie Hua, Jinwei Shen, and James Hubner. 2024. “Tip Vortex Trajectory and Its Application in Small-Rotor/Wing Interaction.” In AIAA SCITECH 2024 Forum. AIAA 2024-2846. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-2846
- Chen, Mingtai, and James P. Hubner. 2020. “Prediction of Dual-Rotor-Wing Interaction in Hover Using Actuator Disk Theory.” In AIAA Aviation 2020 Forum. AIAA 2020-2793. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-2793
- Chen, Mingtai, and James P. Hubner. 2021b. “Numerical Simulations of Single-Rotor/Wing Interaction in Hover at Low Reynolds Number.” In AIAA Aviation 2021 Forum. AIAA 2021-2592. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-2592
- Chen, Mingtai, Jinwei Shen, and James P. Hubner. 2022. “Investigation of Fountain Effect in Dual-Rotor/Wing Interaction at Low Reynolds Number.” In AIAA AVIATION 2022 Forum. AIAA 2022-3816. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-3816
- Chen, Heng, Xu Wang, and Tengfei Lei. 2013. “TiltRotor Aircraft Flight Control Study Based on Fuzzy Logic Control via Genetic Algorithm.” In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-38524-7_41
- Chen, Min, Kun Zhang, and Hai-Long Tang. 2014. “A Probabilistic Design Methodology for a Turboshaft Engine Overall Performance Analysis.” Advances in Mechanical Engineering 6: 976853. https://doi.org/10.1155/2014/976853
- Chen, Qiang, Ning Zhang, Lulu Xue, and Zefeng Chen. 2025a. “Research on Mathematical Modeling Method of Tilt-Rotor Aircraft.” In Lecture Notes in Electrical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-96-2256-6_34
- Chen, Yunhai, Jie Zheng, Zishi Shen, et al. 2019a. “Design, Analysis and Tests of a Tri–Tiltrotor Aircraft.” In AIAA Aviation 2019 Forum. AIAA 2019-2883. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-2883
- Chi, R. 1984. “Separated Flow Unsteady Aerodynamics for Propfan Applications.” In 25th Structures, Structural Dynamics and Materials Conference. AIAA 1984-874. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-874
- Chin, J., V. Chacon, and J. Gera. 1987. “X-29A Flight Control System Performance during Flight Test.” In Aircraft Design, Systems and Operations Meeting. AIAA 1987-2878. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-2878
- Chisman, R. 1991. “Special Operations Aircraft Needs, Options and Feasibility.” In Aircraft Design and Operations Meeting. AIAA 1991-3168. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-3168
- Cho, Changik, Christopher D. Rahn, Edward Smith, and Joseph P. Cusumano. 2023. “Thrust Control and Vibration Damping Using a Wingtip Electric Proprotor.” In AIAA SCITECH 2023 Forum. AIAA 2023-1891. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1891
- Choi, Seongwook. 2005. “Aerodynamic Design of the SUAV Proprotor.” Journal of the Korean Society for Aeronautical & Space Sciences 33 (9): 16–26. https://doi.org/10.5139/jksas.2005.33.9.016
- Choi, Won;Hwang, Yu-Sang;Kim, Cheol-Ho;Kim, Sang-Hun;Lee, Dong-Ho;Park, Chan-Woo;. 2009. “The Development of the Rotorcraft Multidisciplinary Design Optimization Framework and Conceptual Design Using the KHP-SDM RMDO.” Journal of the Korean Society for Aeronautical & Space Sciences 37 (7): 685–92. https://doi.org/10.5139/jksas.2009.37.7.685
- Choi, Jaehoon, Suchul Kim, Jaeseung Kim, Sanggon Moon, and Jonghyeon Sohn. 2022. “Effect of Gear Helix Angle on Lightweight Design of First Reduction Stage in Rotorcraft Transmission.” Journal of the Korean Society of Manufacturing Process Engineers 21 (12): 42–52. https://doi.org/10.14775/ksmpe.2022.21.12.042
- Choi, Yong-Hyeon, Zin W. Thu, Dongoh Kwag, and Jae W. Lee. 2025. “Deriving the Flight Envelope and Conversion Corridor of an eVTOL Tiltrotor Aircraft Considering Battery Discharge Rate.” In AIAA Aviation Forum and Ascend 2025. AIAA 2025-3758. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-3758
- Chopra, Inderjit, and Venkataraman Srinivas. 1996. “Validation of a Comprehensive Aeroelastic Analysis for Tiltrotor Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f52-10212
- Chu, C.-W., V. Ortiz, and T. Widynski. 1983. “A New Ejector Concept for V/STOL Aircraft.” In Aircraft Design, Systems and Technology Meeting. AIAA 1983-2514. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-2514
- Chu, Diyang, Jonathan Sprinkle, Ryan Randall, and Sergey Shkarayev. 2009. “Automatic Control of VTOL Micro Air Vehicle during Transition Maneuver.” In AIAA Guidance, Navigation, and Control Conference. AIAA 2009-5875. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2009-5875
- Chu, Diyang, Jonathan Sprinkle, Ryan Randall, and Sergey Shkarayev. 2010. “Simulator Development for Transition Flight Dynamics of a VTOL MAV.” International Journal of Micro Air Vehicles 2 (2): 69–89. https://doi.org/10.1260/1756-8293.2.2.69
- Chung, Song-Young. 1987. Results of the Integration of a Transonic Full-Potential Analysis Program with a Free-Wake Lifting-Line Program for Hovering Rotors. NASA-TM-89494. NASA. https://ntrs.nasa.gov/citations/19870013198
- Churchill, G. B., and D. C. Dugan. 1982. Simulation of the XV-15 Tilt Rotor Research Aircraft. NASA-TM-84222. NASA. https://ntrs.nasa.gov/citations/19820012300
- Churchill, G. B., and R. M. Gerdes. 1984. Advanced AFCS Developments on the XV-15 Tilt Rotor Research Aircraft. U.S. Army, Aeromechanics Laboratory, Moffett Field. https://ntrs.nasa.gov/citations/19850049862
- Civil Aviation Authority of New Zealand. 2007. “Type Acceptance Report, Pratt and Whitney Canada PW308 Series, 18 October.” https://avsec.govt.nz/assets/aircraft/type-acceptance-reports/Pratt_Whitney_Canada_PW308_Series.pdf
- “Civil Compound Helicopter.” 1972. Aircraft Engineering and Aerospace Technology 44 (2): 10–12. https://doi.org/10.1108/eb034865
- Clark, William H. 1953. “Propeller Control Sysyems for High Speed Flight.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/530205
- Clark, J. 1964. “Research on Vtol Aircraft Handling Qualities Criteria.” In Transport Aircraft Design and Operations Meeting. AIAA 1964-618. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-618
- Clark, Frank B. 1980. “A Hybrid Composite Horizontal Stabilizer for the XH-2/CCR Flight Demonstrator Aircraft.” In Proceedings of the Vertical Flight Society Forum 36 - Washington, D.C. 1980. The Vertical Flight Society. https://doi.org/10.4050/vfs-f36-035
- Clark, David R. 1985. Analysis of the Wing/Rotor and Rotor/Rotor Interactions Present in Tilt-Rotor Aircraft. https://doi.org/10.4050/sm_rotor_1985-1735
- Clarke, G., J. Hoeg, and J. Rebel. 1973. “V/STOL Aircraft Testing for the Sea Control Ship Environment.” In 5th Aircraft Design,Flight Test and Operations Meeting. AIAA 1973-810. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1973-810
- Clay, Bill, Paul Baumgaertner, Pete Thompson, Sam Meyer, Ron Reber, and Dennis Berry. 1987. Civil Tiltrotor Missions and Applications. NASA-CR-177452. NASA. https://ntrs.nasa.gov/citations/19910004111
- Clough, N., J. H. Diedrich, and J. A. Yuska. 1971. Lewis 9- by 15-Foot V/STOL Wind Tunnel. NASA-TM-X-2305. NASA. https://ntrs.nasa.gov/citations/19710020579
- “Coaxial Compound Helicopter Transition Balancing Analysis.” 2015. In Advances in Engineering Materials and Applied Mechanics. CRC Press. https://doi.org/10.1201/b19268-19
- Cobey, William E. 1953. “Convertiplane Development Tests.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f9-010
- Cocco, Alessandro, and Alberto Savino. 2024. “Tiltrotor Whirl-Flutter Assessment by Multifidelity Aerodynamic Models.” In AIAA SCITECH 2024 Forum. AIAA 2024-1850. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1850
- Cocco, A., A. Savino, A. Zanotti, A. Zanoni, P. Masarati, and V. Muscarello. 2021. “Coupled Multibody-Mid Fidelity Aerodynamic Solver for Tiltrotor Aeroelastic Simulation.” In 9th edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering. CIMNE. https://doi.org/10.23967/coupled.2021.013
- Coe, Paul L., Zachary T. Applin, and Louis J. Williams. 1984. “Stability and Control Results for Advanced Turboprop Aft-Mount Installations.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/841479
- Coe, Paul, Jr., and John Perkins. 1990. “Exploratory Wind Tunnel Investigation of the Stability and Control Characteristics of a Three-Surface, Forward-Swept Wing Advanced Turboprop Model.” In Flight Simulation Technologies Conference and Exhibit. AIAA 1990-3074. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3074
- Coe, Paul, Jr., and John Perkins. 1991. “30 x 60 Foot Wind Tunnel Test Highlights for an over-the-Tail Advanced Turboprop Configuration.” In 29th Aerospace Sciences Meeting. AIAA 1991-681. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-681
- Coffen, Charles David. 1992. Tilt Rotor Hover Aeroacoustics. NASA-CR-177598. NASA. https://ntrs.nasa.gov/citations/19930001270
- Coffen, Charles D., and Albert R. George. 1990a. Analysis and Prediction of Tilt Rotor Hover Noise. Cornell Univ. https://ntrs.nasa.gov/citations/19910033018
- Coffen, Charles D., and Albert R. George. 1990b. Prediction of XV-15 Tilt Rotor Discrete Frequency Aeroacoustic Noise with WOPWOP. NASA-CR-187684. NASA. https://ntrs.nasa.gov/citations/19910005490
- Coffen, C. D., and A. R. George. 1993. “Tilt Rotor Broadband Hover Aeroacoustics.” Journal of Fluids Engineering 115 (4): 568–72. https://doi.org/10.1115/1.2910181
- Coffen, Charles D., Albert R. George, Hal Hardinge, and Ryan Stevenson. 1991. “Flow Visualization and Flow Field Measurements of a 1/12 Scale Tilt Rotor Aircraft in Hover.” In In: AHS and Royal Aeronautical Society, Technical Specialists’ Meeting on Rotorcraft Acoustics(Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings (A93-29401 10-71). https://ntrs.nasa.gov/citations/19930045444
- Cole, John N., and Robert T. England. 1967. Evaluation of Noise Problems Anticipated with Future VTOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0658448
- Cole, Julia, Mark Maughmer, and Goetz Bramesfeld. 2013. “Aerodynamic Design Considerations for Tiltrotor Wing Extensions and Winglets.” In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. AIAA 2013-1088. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2013-1088
- Coleman, M. 2011. GE Perspective on Future Vertical Lift Propulsion. https://doi.org/10.4050/sm_prop_2011-2879
- Colli, Andrea, Sung Tyaek Go, Clemence Bricker, Djamel Rezgui, and Mahdi Azarpeyvand. 2026. “Aerodynamics and Aeroacoustics of Rotor-Rotor and Rotor-Wing Interactions in an eVTOL Aircraft.” In 32nd AIAA/CEAS Aeroacoustics Conference (2026). AIAA 2026-3247. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-3247
- Colli, Andrea, Alex Zanotti, and Giuseppe Gibertini. 2024. “Wind-Tunnel Experimental Investigation on Rotor-Rotor Aerodynamic Interaction in Compound Helicopter Configuration.” Preprint, . https://doi.org/10.2139/ssrn.4864681
- Comer, Anthony. 2026. “A Configuration-Independent Trajectory Control System for Simplified Vehicle Operations of VTOL Aircraft.” In Proceedings of the Vertical Flight Society 82nd Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0082-2026-0311
- Comer, Anthony M., and Imon Chakraborty. 2023. “Total Energy Flight Control Architecture Optimization for a Tilt-Wing Aircraft.” In AIAA AVIATION 2023 Forum. AIAA 2023-4510. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-4510
- Comer, Anthony M., and Imon Chakraborty. 2024. “Full Envelope Flight Control System Design and Optimization for a Tilt-Wing Aircraft.” Journal of the American Helicopter Society 69 (3): 1–18. https://doi.org/10.4050/jahs.69.032003
- Comer, Anthony M., Imon Chakraborty, Bikash Kunwar, and Peter Schmidt. 2026a. “Flight Test Validation of a Trajectory Control System for Simplified Vehicle Operations on a Tiltwing VTOL Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0189
- Comer, Anthony M., Benjamin M. Simmons, and Garrett D. Asper. 2025. Design, Simulation, and Flight Testing of a Multi-Purpose VTOL Flight Control System. National Aeronautics and Space Administration. https://doi.org/10.64631/ykyx8927
- Compagnon, M. A. 1980. “A New Approach to Turboshaft Engine Growth.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f36-041
- Conference on V/Stol Aircraft a Compilation of the Papers Presented at Langley Research Center, Langley Field, VA., Nov. 17-18, 1960. 1960. NASA. https://ntrs.nasa.gov/citations/19630004807
- Conlisk, A. 1999. “The Fluid Dynamics of Rotor Wakes: Theory, Computation and Experiment.” In 30th Fluid Dynamics Conference. AIAA 1999-3421. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1999-3421
- Conner, David A., Bryan D. Edwards, William A. Decker, Michael A. Marcolini, and Peter D. Klein. 2002. “NASA/Army/Bell XV-15 Tiltrotor Low Noise Terminal Area Operations Flight Research Program.” Journal of the American Helicopter Society 47 (4): 219. https://doi.org/10.4050/jahs.47.219
- Conner, David, Bryan Edwards, Peter Klein, William Decker, and Michael Marcolini. 2000. “NASA/Army/Bell XV-15 Tiltrotor Low Noise Terminal Area Operations Flight Research Program.” In 6th Aeroacoustics Conference and Exhibit. AIAA 2000-1923. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2000-1923
- Conner, David A., Michael A. Marcolini, Bryan D. Edwards, and John T. Brieger. 1998. XV-15 Tiltrotor Low Noise Terminal Area Operations. Army Aviation and Missile Command. https://ntrs.nasa.gov/citations/20040110255
- Conner, David A., and Brent Wellman. 1991. “Far-Field Hover Acoustic Characteristics of the XV-15 Tiltrotor Aircraft with Advanced Technology Blades.” In In: AHS and Royal Aeronautical Society, Technical Specialists’ Meeting on Rotorcraft Acoustics(Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings (A93-29401 10-71). https://ntrs.nasa.gov/citations/19930045415
- Conner, David A., and J. Brent Wellman. 1993. Hover Acoustic Characteristics of the XV-15 with Advanced Technology Blades. NASA-TM-111578. NASA. https://ntrs.nasa.gov/citations/19960023946
- Conway, Scott. 1991. “Conclusions from High-Speed Rotorcraft Studies.” In 27th Joint Propulsion Conference. AIAA 1991-2149. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-2149
- Cook, Jacob. 2025. “Automating Tilt-Wing Aircraft: A Comprehensive Framework.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0105
- Cook, Jacob William, and Irene M. Gregory. n.d. “A Robust Uniform Control Approach for VTOL Aircraft.” In 2021 Autonomous VTOL Technical Meeting and Electric VTOL Symposium. https://ntrs.nasa.gov/citations/20210000418
- Cook, W. L., and D. H. Hickey. 1965. Correlation of Wind-Tunnel and Flight-Test Aerodynamic Data for Five V/STOL Aircraft. AGARD-520. NASA AMES RES. CENTER. https://ntrs.nasa.gov/citations/19670020207
- Cook, W. L., and D. H. Hickey. 1967. Aerodynamics of V/STOL Aircraft Powered by Lift Fans. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19680013029
- Cooper, Jared K., David G. Ward, and Peter Thompson. 2009. Data-Driven Simulation-Updates of Tiltrotor Aircraft. https://doi.org/10.4050/vfs-f65-000284
- Coplin, J. 1965. “Lift Jet Installational Experience.” In Aircraft Design and Technology Meeting. AIAA 1965-798. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1965-798
- Coplin, John F. 1966. “Lift Jet Installational Experience: A Review of the Progress Made in Lift Jet Installations and on Lift Intake and Exhaust Jet Deflector Design.” Aircraft Engineering and Aerospace Technology 38 (3): 8–15. https://doi.org/10.1108/eb034131
- Cordell, Christopher E., Oliver Pierson, Douglas Hope, John Stewart, Josh Gaston, and Eric Grigorian. 2023. “Modeling and Simulation of Real-Time Rotorcraft Brownout for a Flight Simulator.” In AIAA AVIATION 2023 Forum. AIAA 2023-3723. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-3723
- Corden, C. D., and W. L. Everett. 1963. “Simulation Approach to Development of the XV-5A Lift-Fan V/STOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/630377
- Córdoba G., Mario. 2007. “THE EFIGENIA EJ-1B MOZART: An S/VTOL Autonomous UAV Unmanned Aircraft Autocontrolled with an Intelligent Adaptive Digital Reconfigurable Guidance, Navigation and Flight Control System.” In AIAA Infotech@Aerospace 2007 Conference and Exhibit. AIAA 2007-2732. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2007-2732
- Corle, Ethan, Matt Floros, and Sven Schmitz. 2018. “CFD/CSD Aeroelastic Predictions of a Semi-Span Tiltrotor.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12709
- Corle, Ethan, Matthew Floros, and Sven Schmitz. 2019b. “Transient CFD/CSD Tiltrotor Stability Analysis.” In AIAA Scitech 2019 Forum. AIAA 2019-2132. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-2132
- Corle, Ethan, Matthew Floros, and Sven Schmitz. 2021. “On the Influence of Inflow Model Selection for Time-Domain Tiltrotor Aeroelastic Analysis.” Journal of the American Helicopter Society 66 (3): 1–12. https://doi.org/10.4050/jahs.66.032009
- Corle, Ethan, Sven Schmitz, Hao Kang, and Matthew Floros. 2019a. “Time- and Frequency-Domain Whirl-Flutter Analysis Using a Vortex Particle Method.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14585
- Corliss, Lloyd D. 1982. A Helicopter Handling-Qualities Study of the Effects of Engine Response Characteristics, Height-Control Dynamics, and Excess Power on Nap-of-the-Earth Operations. https://doi.org/10.4050/sm_handling_1982-1262
- Corliss, L., R. K. Greif, and R. Gerdes. 1977. “An in-Flight Simulation of VTOL Hover Control Concepts.” In V/STOL Conference. AIAA 1977-610. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1977-610
- Cormier, Kenneth R. 1999. “T700 Growth through Technology Insertion.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f55-00162
- Cornelius, Daniel, and Scott Hannula. 2019. “Model-Based Engine Health for Turboshaft Engines with Limited Instrumentation.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14612
- Cornes, Olivier. 2019. “Basic Design Limitations for Urban Electric VTOL Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14542
- Corso, Lawrence M., David A. Popelka, and Mark W. Nixon. 1997a. “Design, Analysis, and Test of a Composite Tailored Tiltrotor Wing.” In Proceedings of the Vertical Flight Society Forum 53 - Virginia Beach, VA 1997. The Vertical Flight Society. https://doi.org/10.4050/vfs-f53-120
- Corso, Lawrence M., David A. Popelka, and Mark W. Nixon. 1997b. “Design, Analysis, and Test of a Composite Tailored Tiltrotor Wing.” Journal of the American Helicopter Society 45 (3): 1–11. https://doi.org/10.4050/jahs.45.207
- Corso, Lawrence M., David A. Popelka, Mark W. Nixon, and David J. Piatak. 1999. “Aeroelastic Tailoring for Stability Augmentation and Performance Enhancements of Tiltrotor Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f55-00010
- Cosner, Andrew A., and Glyn S. Rutledge. 1989. “Successful Performance Development Program for the T800-LHT-800 Turboshaft Engine.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/891048
- Costa, Guillermo. 2012. “Conceptual Design of a 150-Passenger Civil Tiltrotor.” In Cal Poly Student Intern Presentation. https://ntrs.nasa.gov/citations/20160014679
- Costa, Guillermo, Sandilya Kambampati, Samuel B. Johnson, and Ed Smith. 2015. “Design, Fabrication, Test, and Evaluation of Small-Scale Tiltrotor Whirl Flutter Wind Tunnel Models.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10286
- Cox, Brian, and Jan Roskam. 1990. “Preliminary Design of a Supersonic Short Takeoff and Vertical Landing (STOVL) Fighter Aircraft.” In Aircraft Design, Systems and Operations Conference. AIAA 1990-3231. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3231
- Cox-Gross, Riley J., and Kyle Collins. 2025. “eVTOL RPM Controlled Rotor Design Methodology for Analyzing Hover Performance and Frequency Response.” In AIAA SCITECH 2025 Forum. AIAA 2025-1289. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-1289
- Crafa, V., and V. Reed. 1980. “Contingency Rating Options for ASW-AEW V/STOL Aircraft.” In Aircraft Systems Meeting. AIAA 1980-1854. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-1854
- Craig, Samuel, Gregory Zwernemann, and Jeffrey Black. 1991. “The Tandem Y-Wing: A New Approach to Stopped Rotor V/STOL.” In Aircraft Design and Operations Meeting. AIAA 1991-3120. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-3120
- Crane, David, Paul Sherrill, Ron Measom, and Max Miller. 2005. Enabling Technology for the BA609 Proprotor Blade. https://doi.org/10.4050/vfs-f61-000263
- Cravener, Kyle, Andrew Harloff, Lancer Drake Halcom, and Andrew Maresh. 2025. Fold-Lock and Pitch-Lock Systems. https://patents.google.com/patent/US20250100674A1/en
- Crawford, William J. 1973. “The T700-GE-700 Turboshaft Engine Program.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/730917
- Crim, Almer D. 1959. “Hovering and Low Speed Controllability of VTOL Aircraft.” Journal of the American Helicopter Society 4 (1): 26–28. https://doi.org/10.4050/jahs.4.1.26
- Crimi, Peter. 1965. Theoretical Prediction of the Flow in the Wake of a Helicopter Rotor. Part 2. Formulation and Application of the Rotor-Wake-Flow Computer Program. Defense Technical Information Center. https://doi.org/10.21236/ad0629783
- Crouse, G., Jr., and J. Leishman. 1993. “A New Method for Improved Rotor Free-Wake Convergence.” In 31st Aerospace Sciences Meeting. AIAA 1993-872. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-872
- Cruz, E. S., N. B. Gorenberg, and A. W. Kerr. 1969. A Flight Envelope Expansion Study for the XH-51A Compound Helicopter. Defense Technical Information Center. https://doi.org/10.21236/ad0864282
- Cui, Bin. 2026. “Overall Design of a Tiltrotor Cargo UAV for Logistics Distribution.” In Sixth International Conference on Testing Technology and Automation Engineering (TTAE 2026), edited by Jinping Liu, Tao Liu. SPIE. https://doi.org/10.1117/12.3124424
- Cullen, Lachlan M., and Joseph M. Schaeffer. 2007. “Operating Procedures and Control Laws for Transport Category Performance in the Bell-Agusta 609 Tiltrotor.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f63-000195
- Cummings, Haley V., Michelle Dominguez, Eduardo Solis, Christopher J. Silva, Belen Bowman, and Shirley Burek. 2020. “XV-15 Tilt Rotor Research Aircraft Photogrammetry and Metrology Measurement.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0076-2020-16278
- Curran, J. J. 1973. “T700 Fuel and Control System a Modern System Today for Tomorrow’s Helicopters.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f29-038
- Curran, J. J. 1974. “T700 Fuel and Control System.” Journal of the American Helicopter Society 19 (3): 17–27. https://doi.org/10.4050/jahs.19.3.17
- Curran, Joseph J., and Allan M. Levine. 1979. “Development of a ‘No Adjustment’ Turboshaft Engine Control System.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f35-041
- Currie, Tom P., Jr. 1999. The CV-22 Osprey” and the Impact on Air Force Combat Search and Rescue”. Defense Technical Information Center. https://doi.org/10.21236/ada389188
- Curtiss, H. C. 1965a. “An Analytical Study of the Dynamics of VTOL Aircraft in Unsteady Flight.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f21-006
- Curtiss, Professor H. C., and Frank W. Warburton. 1992. “Evaluation of Tilt Rotor Aircraft Design Utilizing a Realtime Interactive Simulation.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f48-2027
- Curtiss, H. C., Jr. 1965b. Downwash Tests of the Dual Tandem Ducted Propeller VTOL Research Aircraft Configurations to Evaluate Engine Inlets, Protection Devices and Study Aerodynamic Interference. Defense Technical Information Center. https://doi.org/10.21236/ad0628669
- Curtiss, H., Jr. 1969. “Dynamic Stability of V/STOL Aircraft at Low Speeds.” In VTOL Research, Design, and Operations Meeting. AIAA 1969-194. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-194
- Curtiss, H. C., Jr., T. Komatsuzaki, and J. J. Traybar. 1979. The Influence of Feedback on the Aeroelastic Behavior of Tilt Proprotor Aircraft Including the Effects of Fuselage Motion. NASA-CR-158778. NASA. https://ntrs.nasa.gov/citations/19790018954
- Czarnecki, Michal, John Olsen, and Ruixian Ma. 2019. “PZL-10 Turboshaft Engine–System Design Review.” Journal of KONES 26 (1): 23–29. https://doi.org/10.2478/kones-2019-0003
- D’Alessandro, Francesco, Florian Garnier, Damien Guivarch, et al. 2025. “Computational Terms to Be Considered in the Investigation of Whirl-Flutter Phenomenon in Installed Propeller Aeroengine Systems.” In Volume 8: Structures and Dynamics — Bearing & Seal Dynamics; Emerging Methods in Engineering Design, Analysis and Additive Manufacturing; Fatigue, Fracture & Life Prediction; Probabilistic Methods; Rotordynamics. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2025-153582
- D’Andrea, Andrea. 2009. Numerical Analysis of Unsteady Vortical Flows Generated by a Rotorcraft Operating on Ground: A First Assessment of Helicopter Brownout. https://doi.org/10.4050/vfs-f65-000351
- D’Andrea, Andrea, and Francesco Scorcelletti. 2010. “Enhanced Numerical Simulations of Helicopter Landing Maneuvers in Brownout Conditions.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f66-000180
- D’Angelo, Marin M. 2004. Contingency Power Study for Short Haul Civil Tiltrotor. NASA/CR-2004-213096. NASA. https://ntrs.nasa.gov/citations/20040077263
- da Luz, Isadora, José Manoel Balthazar, and Carlos Alberto Bavastri. 2025. “The Use of Lyapunov Exponent to Nonlinear Stability Analysis of a Whirl Flutter in a Rotor/nacelle System.” In Proceedings of the 28th International Congress of Mechanical Engineering. ABCM. https://doi.org/10.26678/abcm.cobem2025.cob2025-0421
- Dabundo, C., and M. Neary. 1985. “A Longitudinal Stability Augmentation System for a Tilt Rotor Aircraft.” In 23rd Aerospace Sciences Meeting. AIAA 1985-72. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-72
- Dadone, Leo U., Joseph Wilkerson, Cecil W. Acree, and John Liu. 1994. “Proprotor Design Issues for High Speed Tiltrotors.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f50-8888
- Daffer, George H., and David F. Rogers. 1973. Simulation of the Compatibility of an Air Capable Ship and a VTOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0764865
- Dancik, Paul J., Frederick R. Mazzitelli, and William B. Peck. 1958. “Test Experience on the Vertol 76 Tilt Wing VTOL Research Aircraft.” In Proceedings of the Vertical Flight Society Forum 14 - Washington, D.C. 1958. The Vertical Flight Society. https://doi.org/10.4050/vfs-f14-002
- Dangelmaier, R. 1982. “T700: Modern Development Test Techniques, Lessons Learned and Results.” In 18th Joint Propulsion Conference. AIAA 1982-1183. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1982-1183
- Dangelo, Martin. 1995. Wide Speed Range Turboshaft Study. NASA-CR-198380. NASA. https://ntrs.nasa.gov/citations/19960009440
- Daniel, J. Nelson. 1964. “New Concepts in Helicopter and VTOL Transmission Systems.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f20-007
- Danis, Reed A., Michael W. Green, Jeffrey L. Freeman, and David W. Hall. 2018. Examining the Conceptual Design Process for Future Hybrid-Electric Rotorcraft. NASA/CR-2018-219897. NASA. https://ntrs.nasa.gov/citations/20180003214
- Darabi, Amir, and Israel Wygnanski. 2003. “The Rotor Wake above a Tilt-Rotor Airplane Model in Hover.” In 33rd AIAA Fluid Dynamics Conference and Exhibit. AIAA 2003-3596. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-3596
- Darling, Richard, George Hogg, and Ernst Staudt. 1970. Requirements and Developmental Techniques for Engine Air Particle Separators in VTOL Aircraft. https://doi.org/10.4050/sm_env_1970-4062
- Darmstadt, Patrick R., and Mark Robuck. 2018. “Composites for Advanced Drive Systems, a Systems Analysis Revolutionary Vertical Lift Technology (RVLT).” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12862
- DARPA. 2023a. “SPRINT Proposers Day and BAA Questions and Answers, 30 March.” https://sam.gov/api/prod/opps/v3/opportunities/resources/files/0368659810954dc7b747f40461a31607/download
- DARPA. 2023b. “SPRINT Proposers Day slides, 23 March.” https://sam.gov/api/prod/opps/v3/opportunities/resources/files/6058e645a0f3474abf5275e6c5c01a0e/download
- “DARPA PB2024 justification.” n.d. Accessed October 24, 2026. https://comptroller.war.gov/Portals/45/Documents/defbudget/fy2024/budget_justification/pdfs/03_RDT_and_E/RDTE_Vol1_DARPA_MasterJustificationBook_PB_2024.pdf
- “DARPA PB2025 justification.” n.d. Accessed October 24, 2026. https://comptroller.war.gov/Portals/45/Documents/defbudget/fy2025/budget_justification/pdfs/03_RDT_and_E/RDTE_Vol1_DARPA_MasterJustificationBook_PB_2025.pdf
- “DARPA PB2027 justification.” n.d. Accessed October 24, 2026. https://comptroller.war.gov/Portals/45/Documents/defbudget/FY2027/budget_justification/pdfs/03_RDT_and_E/RDTE_Vol1_DARPA_MasterJustificationBook_PB_2027.pdf
- DARPA Tactical Technology Office. 2023. “SPeed and Runway INdependent Technologies X-Plane Demonstrator Project, Broad Agency Announcement HR001123S0031, March.” https://sam.gov/api/prod/opps/v3/opportunities/resources/files/583b768a264742c7b403cb2befbf1935/download
- Das Biswas, Somrick, William A. Crossley, and Daniel DeLaurentis. 2026. “Investigation of Different Hybridization Schemes for VTOL Aircraft Using Conceptual Design Tools.” In AIAA AVIATION 2026 Forum. AIAA 2026-4787. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-4787
- Datta, Anubhav, Hyeonsoo Yeo, and Thomas Norman. 2011. Experimental Investigation and Fundamental Understanding of a Slowed UH-60A Rotor at High Advance Ratios. https://doi.org/10.4050/vfs-f67-000160
- Datta, Anubhav, Hyeonsoo Yeo, and Thomas R. Norman. 2013. “Experimental Investigation and Fundamental Understanding of a Full-Scale Slowed Rotor at High Advance Ratios.” Journal of the American Helicopter Society 58 (2): 1–17. https://doi.org/10.4050/jahs.58.022004
- Daud Filho, Antonio Carlos. n.d. “A Tilt-Wing VTOL UAV Configuration Study: Flight Dynamics Modeling, Simulation, States Estimation, Control, Systems Integration and Flight Testing.” PhD diss., Universidade de São Paulo. https://doi.org/10.11606/t.18.2023.tde-27032023-153150
- Daud Filho, A. C., and E. M. Belo. 2023. “A Tilt-Wing VTOL UAV Configuration: Flight Dynamics Modelling and Transition Control Simulation.” Aeronautical Journal 128 (1319): 152–77. https://doi.org/10.1017/aer.2023.34
- Davies, K. 1964. “Status Report on Lift Jets.” In Transport Aircraft Design and Operations Meeting. AIAA 1964-609. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-609
- Davis, S. 1983. “Accelerated Simulated Mission Endurance Test of a Turboshaft Engine for Military Attack Helicopter Application.” In 19th Joint Propulsion Conference. AIAA 1983-1359. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-1359
- Davis, J. 1987. “Transient Test System Design for the T800-APW-800 Turboshaft Engine.” In 23rd Joint Propulsion Conference. AIAA 1987-1791. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-1791
- Davis, Hubert. 1989. “A Technology Demonstrator Vehicle for Advanced Launch Systems.” In 25th Joint Propulsion Conference. AIAA 1989-2949. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2949
- Davis, Charles E., and John R. Mertens. 1958. “Wind Tunnel and Flight Testing the XV-3 Fixed-Wing VTOL.” In Proceedings of the Vertical Flight Society Forum 14 - Washington, D.C. 1958. The Vertical Flight Society. https://doi.org/10.4050/vfs-f14-004
- Day, L. 1965. “The XC-142A V/STOL: New Structures Design Challenge.” In Aircraft Design and Technology Meeting. AIAA 1965-769. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1965-769
- De Gaudemaris, Vincent. n.d. “Development of Low-to Mid-Fidelity Models for the Analysis of Whirl Flutter in Rigid or Flexible Blade Propellers.” PhD diss., Ecully, Ecole centrale de Lyon. https://doi.org/10.70675/94ae669az223az4e3cz9e49zf4a9d75e664c
- de la Calzada, Pedro, Jorge Parra, and Belén Mínguez. 2013b. “Investigation on the Aerodynamic Performance of an Annular Exhaust System for a Small Turboshaft Engine.” In Volume 6B: Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2013-94022
- de la Calzada, Pedro, Miguel A. Villanueva, Jorge Parra, and Juan I. Ruiz-Gopegui. 2013a. “Design and Development of the Inter-Turbine Structure and Power Turbine for MTR390-E Turboshaft Engine.” In Volume 2: Aircraft Engine; Coal, Biomass and Alternative Fuels; Cycle Innovations. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2013-94021
- de Paula, Camila, Guilherme Fernandes, and Victor Maldonado. 2025. “Aerodynamic Simulations of a Blended Fan-in-Wing Body VTOL Configuration for Optimal and Efficient Flight Transition.” In AIAA Aviation Forum and Ascend 2025. AIAA 2025-3764. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-3764
- De Vita, Paolo, Gianni Cassoni, Marco Morandini, et al. 2025. “Numerical Whirl-Flutter Investigation of a Multibody/Vortex Particle Tiltrotor Model with Frictional Components.” Preprint, Research Square. https://doi.org/10.21203/rs.3.rs-6511107/v1
- Deal, P. L., J. F. Garren Jr., and J. R. Kelly. 1967. Flight Investigation of V/STOL Height- Control Requirements for Hovering and Low- Speed Flight under Visual Conditions. NASA-TN-D-3977. NASA. https://ntrs.nasa.gov/citations/19670015729
- Deal, Perry L., and Julian L. Jenkins. 1968. “Flight Investigation of the Wing-Rotor Lift-Sharing Characteristics of a Hingeless Rotor Compound Helicopter.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f24-014
- Deal, P. L., and J. L. Jenkins Jr. 1969. Flight Investigation of the Wing-Rotor Lift- Sharing Characteristics of a Hingeless Rotor Compound Helicopter. NASA. https://ntrs.nasa.gov/citations/19690051713
- Deal, P. L., and J. L. Jenkins Jr. 1970. Investigation of Level-Flight and Maneuvering Characteristics of a Hingeless-Rotor Compound Helicopter. NASA-TN-D-5602. NASA. https://ntrs.nasa.gov/citations/19700006834
- deBrun, Erik T., Yi Lu, Tom L. MacDonald, and David G. Miller. 2003. “Tiltrotor Control Law Development for Handling Qualities Enhancement in the Shipboard Operational Environment.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f59-1711
- Decker, William A., Douglas Isleib, and John Johns. 1989. “A Simulator Investigation of Air-to-Air Combat Maneuvering for Tilt-Rotor Aircraft.” In National Technical Specialists’’ Meeting on Tactical V/STOL. https://ntrs.nasa.gov/citations/19900051486
- Decker, William A., Rickey C. Simmons, George E. Tucker, and Edwin W. Aiken. 1994. Handling Qualities Influences on Civil Tiltrotor Terminal Operating Procedure Development. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20020002849
- Deckert, W. H. 1977. “Moving V/STOL from Technology to System.” Astronautics and Aeronautics 15. https://ntrs.nasa.gov/citations/19780032784
- Deckert, W. H. 1979. Recent V/STOL Aircraft Designs. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19790063595
- Deckert, W. H., and D. H. Hickey. 1967. Summary and Analysis of Related Feasibility- Study Designs of V/STOL Transport Aircraft. AIAA PAPER 67-938. NASA. https://ntrs.nasa.gov/citations/19670064299
- Deckert, W. H., and C. A. Holzhauser. 1973. “Evaluation of V/STOL Research Aircraft Design.” In Society of Automotive Engineers. https://ntrs.nasa.gov/citations/19740028807
- Deckert, Wallace H., and John L. McCloud III. 1968. “Considerations of the Stopped Rotor V/STOL Concept.” Journal of the American Helicopter Society 13 (1): 27–43. https://doi.org/10.4050/jahs.13.1.27
- Deckert, W. H., and L. S. Rolls. 1974. “Integrated Propulsion/energy Transfer Control Systems for Lift-Fan V/STOL Aircraft.” In AGARD V(STOL Propulsion Systems. https://ntrs.nasa.gov/citations/19740012303
- Defense Advanced Research Projects Agency, RDT&E Programs Justification Book, and President’s Budget. 2026. “June 2025.” https://comptroller.war.gov/Portals/45/Documents/defbudget/FY2026/budget_justification/pdfs/03_RDT_and_E/RDTE_Vol1_DARPA_MasterJustificationBook_PB_2026.pdf
- Defense Science Board Washington Dc. 1979. Final Report of the Defense Science Board Task Force on V/STOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ada201049
- Dehaeze, Florent, Christian B. Allen, and George N. Barakos. 2017. “The Collaborative Development of New CFD Methods Adapted for Tilt Rotor Aircraft in the HiPerTilt Project.” In 35th AIAA Applied Aerodynamics Conference. AIAA 2017-3919. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-3919
- Dehaeze, F., and G. N. Barakos. 2012. “Hovering Rotor Computations Using an Aeroelastic Blade Model.” Aeronautical Journal 116 (1180): 621–49. https://doi.org/10.1017/s0001924000007107
- Dehennis, Timothy. 2025. “Evaluation and Implementation of Low Core Hardness Gears in the SB>1 DEFIANT JMR Technology Demonstrator Aircraft.” In Proceedings of the Vertical Flight Society 81st Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0081-2025-0228
- Delash, Thomas. 2023. Thermal Management for Future Vertical Lift Platforms. https://doi.org/10.4050/sm_2023_prop-1000
- Delgado, Xavier, and Anubhav Datta. 2024. “High Speed Whirl Flutter Tests of Swept-Tip Tiltrotor Blades.” In AIAA SCITECH 2024 Forum. AIAA 2024-1851. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1851
- Delgado, Xavier M., and Anubhav Datta. 2025. “High Speed Whirl Flutter Tests and Predictions of Swept-Tip Tiltrotor Blades.” In AIAA SCITECH 2025 Forum. AIAA 2025-0428. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-0428
- Delgado, Xavier, and Anubhav Datta. 2026. “Parametric Whirl Flutter Testing of Swept-Tip Proprotor Blades.” In Proceedings of the Vertical Flight Society 82nd Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0082-2026-0269
- DellaCorte, Christopher, and Robert J. Bruckner. 2007. “Oil-Free Rotor Support Technologies for an Optimized Helicopter Propulsion System.” In International Society for Air Breathing Engines. https://ntrs.nasa.gov/citations/20070023441
- DeLorenzo, Charles, Jared Deleon, and Paul E. Slaboch. 2018. “Effect of Aft Rotor on Forward Rotor Blade Wakes in Open Rotor Propulsion Systems.” In Volume 1: Aircraft Engine; Fans and Blowers; Marine. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2018-76183
- Demers Bouchard, Etienne, David Rancourt, and Dimitri N. Mavris. 2015. “Integration of Electric Propulsion in Efficient Heavy-Lift VTOL Concept.” In 15th AIAA Aviation Technology, Integration, and Operations Conference. AIAA 2015-3337. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-3337
- Demott, Robert, Lloyd Mize, and Robert Klenke. 2010. “Control Algorithms Used in the VCU Rotor-Wing Flight Control System.” In AIAA Infotech@Aerospace 2010. AIAA 2010-3493. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2010-3493
- Deneke, Joseph A., and Darius Carter. 2025. “Rotor Aerodynamics in Boundary Layer Flow with Ground Effect.” In AIAA SCITECH 2025 Forum. AIAA 2025-1266. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-1266
- Deng, Yangping, and Baigang Mi. 2019. “Design and Analysis of Rotor/Wing Flap for Canard Rotor/Wing Aircraft.” Journal of Physics: Conference Series 1215 (1): 012011. https://doi.org/10.1088/1742-6596/1215/1/012011
- Deng, S., B. W. van Oudheusden, T. Xiao, and H. Bijl. 2012. “A Computational Study on the Aerodynamic Influence of a Propeller on an MAV by Unstructured Overset Grid Technique and Low Mach Number Preconditioning.” Open Aerospace Engineering Journal 5 (1): 11–21. https://doi.org/10.2174/1874146001205010011
- DeNicola, Lucia, Luca Belluomini, Sid Xiao, and Ahmad Haidar. 2022. “Flight Test Validation of Thrust Axis Tactile Cueing System on AW609 Tiltrotor.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0078-2022-1262
- DePalo, Lee K. 2005. USAF Combat Search and Rescue. Untapped Combat Power (Maxwell Paper, Number 35). Defense Technical Information Center. https://doi.org/10.21236/ada441693
- der Meulen, B. van, Michiel Bardet, Theo ter Meer, E. Brehl, and Keith Soal. 2024. B5.1: Measuring the Aeroelastic Properties of a Tiltrotor Aircraft in a Wind Tunnel Model. https://doi.org/10.5162/ettc2024/b5.1
- “Description of XV-15 Design Case Studies.” 2017. In Practical Methods for Aircraft and Rotorcraft Flight Control Design: An Optimization-Based Approach. American Institute of Aeronautics and Astronautics, Inc. https://doi.org/10.2514/5.9781624104435.0087.0104
- “Design and Simulation of a Tilt: Rotor Deformable Flying Car.” 2025. Academic Journal of Engineering and Technology Science 8 (2). https://doi.org/10.25236/ajets.2025.080203
- “Design Concepts for Minimizing Hot-Gas Ingestion in V/STOL Aircraft.” 1981. In Aircraft Systems and Technology Conference. AIAA 1981-1624. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-1624
- “Design of the Circulation Control Wing STOL Demonstrator Aircraft.” 1979. In Aircraft Systems and Technology Meeting. AIAA 1979-1842. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1979-1842
- Desilets, Alexander. n.d. “Development of an Efficient Vertical Takeoff and Landing Aircraft.” PhD diss., University of Rhode Island. https://doi.org/10.23860/thesis-desilets-alexander-2019
- DeSmidt, Hans A., Edward C. Smith, Robert C. Bill, and Kon-Well Wang. 2013. Comprehensive Modeling and Analysis of Rotorcraft Variable Speed Propulsion System with Coupled Engine/Transmission/Rotor Dynamics. NASA/CR-2013-216502. NASA. https://ntrs.nasa.gov/citations/20130014755
- Desopper, Andre. 1985. Rotor Wake Measurements for a Rotor in Forward Flight. https://doi.org/10.4050/sm_rotor_1985-4135
- Detore, Jack, and Scott Conway. 1991. Technology Needs for High Speed Rotorcraft (3). NASA-CR-177592. NASA. https://ntrs.nasa.gov/citations/19920004821
- Detore, J., and T. Gaffey. 1969. “The Stopped-Rotor Variant of the Proprotor VTOL Aircraft.” In VTOL Research, Design, and Operations Meeting. AIAA 1969-220. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-220
- DeTore, J. A., and T. M. Gaffey. 1970. “The Stopped-Rotor Variant of the Proprotor VTOL Aircraft.” Journal of the American Helicopter Society 15 (3): 45–56. https://doi.org/10.4050/jahs.15.45
- Detore, J. A., and K. W. Sambell. 1975. Conceptual Design Study of 1985 Commercial Tilt Rotor Transports. Volume 1: VTOL Design Summary. NASA-CR-2544. NASA. https://ntrs.nasa.gov/citations/19750013184
- Dibble, Robert, Vaclav Ondra, Benjamin K. Woods, and Branislav Titurus. 2019a. “Aeroelastic Eigenvalue Analysis of a Variable Speed Rotor Blade with an Applied Compressive Load.” In AIAA Scitech 2019 Forum. AIAA 2019-1355. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1355
- Dicarlo, D. J., N. R. Driscoll, and J. F. Garren Jr. 1966. Flight Investigation of an on-off Control for V/STOL Aircraft under Visual Conditions. NASA-TN-D-3436. NASA. https://ntrs.nasa.gov/citations/19660018747
- Diedrich, J. 1971. “Wind Tunnel Tests of a Wing-Installed Model VTOL Lift Fan with Coaxial Drive Turbine.” In 7th Propulsion Joint Specialist Conference. AIAA 1971-742. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1971-742
- Diedrich, J. H., J. L. Hassell Jr., D. H. Hickey, R. W. Luidens, N. D. Sanders, and W. L. Stewart. 1971. V/STOL Propulsion. NASA Lewis Research Center. https://ntrs.nasa.gov/citations/19710009981
- Diehl, J. J. 1978. Application of a Cost/performance Measurement System on a Research Aircraft Project. NASA-TM-78498. NASA. https://ntrs.nasa.gov/citations/19780019100
- Diehl, Lorenzo S., Lucas A. Bonomo, Lucas M. Pereira, Julio A. Cordioli, and Eduardo Hulse. 2026. “Outdoor Static Testing of Propeller Noise at High Tip Mach Numbers under Ambient Wind Influence.” In 32nd AIAA/CEAS Aeroacoustics Conference (2026). AIAA 2026-3550. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-3550
- “Digital Engine Control for V/STOL and V/TOL Aircraft.” 1982. Aircraft Engineering and Aerospace Technology 54 (9): 19–22. https://doi.org/10.1108/eb035820
- Dikshit, Abhijnan, Tom Stokkermans, Shawn Lim, and James Wang. 2022. “Effect of Lifting Surface and Tail Configuration on the Aerodynamics and Flight Mechanics of VTOL Aircraft.” In Proceedings of the Vertical Flight Society 78th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0078-2022-17483
- DiMaggio, Griffin A., Benjamin M. Simmons, Steven C. Geuther, Roy J. Hartfield, and Vivek Ahuja. 2025. “Transition Aero-Propulsive Analysis of a Tilt-Wing eVTOL Aircraft Using a Surface-Vorticity Solver.” In AIAA SCITECH 2025 Forum. AIAA 2025-0654. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-0654
- Dimanlig, Arsenio C. B., Cornelis P. Vandam, and Earl P. N. Duque. 1994. Numerical Simulation of Helicopter Engine Plume in Forward Flight. NASA-CR-197488. NASA. https://ntrs.nasa.gov/citations/19950010174
- DiOttavio, James, and David Friedmann. 2010. “Operational Benefits of an Optimal, Widely Variable Speed Rotor.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f66-000460
- DiPalma, Matthew, Tim Conti, Claude G. Matalanis, Preston Bates, and Joe Szefi. 2022. “Design and Test of an Active Pneumatic Trailing Edge Flap for High-Speed Rotorcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0078-2022-1130
- DiPalma, Matthew, Etana Ferede, and Farhan S. Gandhi. 2018. “Optimization of Extension-Twist Coupled Composite Blades for High-Speed Rotorcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12881
- Dittmar, J. H. 1985a. “Further Comparison of Wind Tunnel and Airplane Acoustic Data for Advanced Design High Speed Propeller Models.” In Meeting of the Acoust. Soc. of Am.. https://ntrs.nasa.gov/citations/19850013798
- Dittmar, James H. 1985b. “Further Comparisons of Wind Tunnel and Airplane Acoustic Data for Advanced Design High-Speed Propeller Models.” Journal of the Acoustical Society of America 77 (S1): S76-S76. https://doi.org/10.1121/1.2022502
- Dittmar, J. H. 1985c. Preliminary Measurement of the Noise from the 2/9 Scale Model of the Large-Scale Advanced Propfan (LAP) Propeller, SR-7A. NASA-TM-87116. NASA. https://ntrs.nasa.gov/citations/19860004537
- Dittmar, J. H., B. J. Blaha, and R. J. Jeracki. 1978. Tone Noise of Three Supersonic Helical Tip Speed Propellers in a Wind Tunnel at 0.8 Mach Number. NASA-TM-79046. NASA. https://ntrs.nasa.gov/citations/19790007587
- Dittmar, James H., and David G. Hall. 1991. Detailed Noise Measurements on the SR-7A Propeller: Tone Behavior with Helical Tip Mach Number. NASA-TM-105206. NASA. https://ntrs.nasa.gov/citations/19920007487
- Dittmar, J. H., and E. J. Rice. 1981. A Shock Wave Approach to the Noise of Supersonic Propellers. NASA-TM-82752. NASA. https://ntrs.nasa.gov/citations/19820008935
- Dittmar, James, and David Stang. 1987a. “Cruise Noise of the 2/9 Scale Model of the Large-Scale Advanced Propfan (LAP) Propeller, SR-7A.” In 11th Aeroacoustics Conference. AIAA 1987-2717. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-2717
- Dittmar, James H., and David B. Stang. 1987b. Cruise Noise of the 2/9th Scale Model of the Large-Scale Advanced Propfan (LAP) Propeller, SR-7A. NASA-TM-100175. NASA. https://ntrs.nasa.gov/citations/19870018965
- DiVittorio, Ernesto M. 2010. CSAR-eXit: The Future of Air Force Combat Search and Rescue. Defense Technical Information Center. https://doi.org/10.21236/ad1018553
- Doblhoff, F. L. 1959. “Some Characteristics and Limitations of the Unloaded Rotor Compound Helicopter.” Journal of the American Helicopter Society 4 (1): 12–14. https://doi.org/10.4050/jahs.4.12
- Doetsch, Hans K., and Leon Mark. 1953. Wind-Tunnel Investigation to Determine the Critical Advance Ratio of the 8/31-SCALE Mcdonnell Model 82 Convertiplane Rotor. Defense Technical Information Center. https://doi.org/10.21236/ad0016744
- Dollinger, Daniel, Philipp Reiss, Jorg Angelov, David Löbl, and Florian Holzapfel. 2021. “Control Inceptor Design for Onboard Piloted Transition VTOL Aircraft Considering Simplified Vehicle Operation.” In AIAA Scitech 2021 Forum. AIAA 2021-1896. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-1896
- Doman, David, and D. Andrisani III. 1994. “Use of a Laboratory Tilt Rotor Aircraft to Develop Practical Knowledge of Flying Qualities Issues.” In Guidance, Navigation, and Control Conference. AIAA 1994-3696. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1994-3696
- Donham, Robert E., and Wayne P. Harvick. 1967. “Analysis of Stowed Rotor Aeroelastic Characteristics.” Journal of the American Helicopter Society 12 (1): 21–44. https://doi.org/10.4050/jahs.12.21
- Donham, Robert E., and Raymond W. Prouty. 1967. “Aerodynamic Considerations of Stopping a Rotor in Flight.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f23-002
- Dony, Md Nur-A-Adam, and Md Azizul Islam. 2026. “Transition Control of a Quadplane VTOL Certified on a Flight-Identified Model: Polytopic Lyapunov Synthesis and a Bypassable Barrier Filter on the PX4 Stack.” Preprint, . https://doi.org/10.2139/ssrn.7478050
- Doo, Johnny T., Marilena D. Pavel, Arnaud Didey, et al. 2021. NASA Electric Vertical Takeoff and Landing (eVTOL) Aircraft Technology for Public Services – a White Paper. International Vehicle Research, Inc. https://ntrs.nasa.gov/citations/20205000636
- Dooley, Larry W., Dwayne F. Kimball, and D. L. Smithson. 1987. The Development and Application of a Tiltrotor Flight Simulation. https://doi.org/10.4050/sm_avionics_1987-4504
- Dopher, Robert, and James E. Duh. 1987. “Prediction of Aeroelastic Response of a Model X-Wing Rotor.” In NASA. Ames Research Center Proceedings of the Circulation-Control Workshop, 1986. https://ntrs.nasa.gov/citations/19880008219
- Douglas, L. L. 1956. “Future of Vertical Lift Aircraft.” Journal of the American Helicopter Society 1 (2): 3–11. https://doi.org/10.4050/jahs.1.2.3
- Douglas, Laura M. 1991. “Development of a Lubrication System for the T800-LHT-800 Turboshaft Engine.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/91-gt-398
- Drago, Raymond, and John Mack. 1987. “Development of a Large, Spiral Bevel Gear Rotorcraft Transmission.” In 23rd Joint Propulsion Conference. AIAA 1987-1839. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-1839
- Dragos Daniel, Ion Guta, Gheorma Cristian-Tudor, Pascale Catalin, Berceanu Radu, and Neagu Mihai. 2026. “Flight Control System for Ultra-Light Aircraft Conversion to VTOL Unmanned Aircraft Vehicle.” Preprint, . https://doi.org/10.20944/preprints202601.0351.v1
- Drees, Jan M. 1963. “High Speed Helicopter Rotor Design.” Journal of the American Helicopter Society 8 (3): 21–29. https://doi.org/10.4050/jahs.8.21
- Driggers, H. H., S. A. Powers, and R. T. Roush. 1982. Study of Aerodynamic Technology for Single-Cruise Engine V/STOL Fighter/attack Aircraft. NASA-CR-166271. NASA. https://ntrs.nasa.gov/citations/19840020668
- Drinkwater, F. J., III. 1960. Operational Technique for Transition of Several Types of v STOL Aircraft. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19630004816
- Drinkwater, F. J., III, H. C. Quigley, L. S. Rolls, and H. L. Turner. 1964. V/stol Handling Qualities as Determined by Flight Test and Simulation Techniques. NASA. https://ntrs.nasa.gov/citations/19650032844
- Droandi, Giovanni, and Giuseppe Gibertini. 2015a. “Aerodynamic Blade Design with Multi-Objective Optimization for a Tiltrotor Aircraft.” Aircraft Engineering and Aerospace Technology 87 (1): 19–29. https://doi.org/10.1108/aeat-01-2013-0005
- Droandi, G., and G. Gibertini. 2015b. “Aerodynamic Shape Optimisation of a Proprotor and Its Validation by Means of CFD and Experiments.” Aeronautical Journal 119 (1220): 1223–51. https://doi.org/10.1017/s0001924000011222
- Droandi, G., A. Zanotti, G. Gibertini, D. Grassi, and G. Campanardi. 2015. “Experimental Investigation of the Rotor-Wing Aerodynamic Interaction in a Tiltwing Aircraft in Hover.” Aeronautical Journal 119 (1215): 591–612. https://doi.org/10.1017/s0001924000010708
- Duello, Charles. 2002. “BA609 Tiltrotor Drive System.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f58-00022
- Duffy, Michael, John Liu, and Michael A. (Tony) McVeigh. 2012. “Aerodynamic Design of Nacelle-Mounted Sails for Flight Test Demonstration on the V-22 Osprey Tiltrotor.” In 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. AIAA 2012-1041. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2012-1041
- Dugan, D. C. 1985. The XV-15 Tilt-Rotor Flight-Test Program. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19860060200
- Dugan, Daniel C. 2014. “Trust Control of VTOL Aircraft Part Deux.” In Decennial AHS Aeromechanics Specialists’’ Conference. https://ntrs.nasa.gov/citations/20140008647
- Dugan, J., D. Bencze, and L. Williams. 1977. “Advanced Turboprop Technology Development.” In Aircraft Systems and Technology Meeting. AIAA 1977-1223. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1977-1223
- Dugan, D. C., R. G. Erhart, and L. G. Schroers. 1980. The XV-15 Tilt Rotor Research Aircraft. NASA-TM-81244. NASA. https://ntrs.nasa.gov/citations/19810001546
- Dugan, Daniel C., and William S. Hindson. 1997. Don’t Look Now: Tiltrotors Are Coming!. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20020048314
- Dugas, R. M. 1986. Effects of Test Cell Recirculation on High-Bypass Turbofan Engines during Simulated Altitude Tests. Defense Technical Information Center. https://doi.org/10.21236/ada171418
- Dukes, Theodor A. 1970. Feedback Control of VTOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0871424
- Dunn, Mark, and F. Farassat. 1990. “State-of-the-Art of High-Speed Propeller Noise Prediction: A Multidisciplinary Approach and Comparison with Measured Data.” In 13th Aeroacoustics Conference. AIAA 1990-3934. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3934
- Durbin, David B., Jim A. Faughn, Richard W. Kozycki, Jamison S. Hicks, and Ron L. Carty. 2014. Assessment of Cabin Dimensions to Accommodate Infantry Soldiers for the Future Vertical Lift/Joint Multi-Role Medium-Class Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ada607676
- Durston, D., and J. Schreiner. 1983. “High Angle-of-Attack Aerodynamics of a Strake-Canard-Wing V/STOL Fighter Configuration.” In Aircraft Design, Systems and Technology Meeting. AIAA 1983-2510. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-2510
- Durston, D., and S. Smith. 1981. “Lift-Enhancing Surfaces on Several Advanced V/STOL Fighter/attack Aircraft Concepts.” In Aircraft Systems and Technology Conference. AIAA 1981-1675. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-1675
- Duvivier, Jean-Pierre. 1966. “Some Design Criteria and Operational Characteristics of High Performance Naval VTOL Aircraft.” Journal of the American Helicopter Society 11 (2): 1–7. https://doi.org/10.4050/jahs.11.2.1
- Duyar, Ahmet, Zhen Gu, and Jonathan S. Litt. 1992. “Identification of the Open Loop Dynamics of the T700 Turboshaft Engine.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f48-1035
- Duyar, Ahmet, Zhen Gu, and Jonathan S. Litt. 1995. “A Simplified Dynamic Model of the T700 Turboshaft Engine.” Journal of the American Helicopter Society 40 (4): 62–70. https://doi.org/10.4050/jahs.40.62
- Dvirnyk, Yaroslav, Dmytro Pavlenko, and Radoslaw Przysowa. 2019. “Determination of Serviceability Limits of a Turboshaft Engine by the Criterion of Blade Natural Frequency and Stall Margin.” Preprint, . https://doi.org/10.20944/preprints201911.0036.v1
- E-33 In Flight Propulsion Measurement Committee. n.d. Propeller/Propfan in-Flight Thrust Determination. SAE International. https://doi.org/10.4271/air4065
- Eames, David J. H. 2006. Short Haul Civil Tiltrotor Contingency Power System Preliminary Design. NASA/CR-2006-214059. NASA. https://ntrs.nasa.gov/citations/20060006384
- Edenborough, H. 1967. “Investigation of Tilt-Rotor VTOL Aircraft Rotor-Pylon Stability.” In 5th Aerospace Sciences Meeting. AIAA 1967-17. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1967-17
- Edenborough, H., T. Gaffey, and J. Weiberg. 1972. “Analyses and Tests Confirm Design of Proprotor Aircraft.” In 4th Aircraft Design, Flight Test, and Operations Meeting. AIAA 1972-803. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1972-803
- Edenborough, H. Kipling, and Kenneth G. Wernicke. 1971. “Full-Scale Proprotor Development.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f27-002
- Edkins, Denis P. 1969. Convertible Fan/Shaft Engines Incorporating Variable-Pitch Fan Rotors. Defense Technical Information Center. https://doi.org/10.21236/ad0859275
- Edwards, B. D. 1998. XV-15 Low-Noise Terminal Area Operations Testing. NASA/CR-1998-206946. NASA. https://ntrs.nasa.gov/citations/19980047341
- Edwards, Bryan D., and David A. Conner. 2003a. XV-15 Tiltrotor Aircraft: 1997 Acoustic Testing. NASA/TM-2003-212151. NASA. https://ntrs.nasa.gov/citations/20030052724
- Edwards, Bryan D., and David A. Conner. 2003b. XV-15 Tiltrotor Aircraft: 1999 Acoustic Testing: Test Report. NASA/TM-2003-212152. NASA. https://ntrs.nasa.gov/citations/20030039187
- Edwards, Bryan D., David A. Conner, William A. Decker, Michael A. Marcolini, and Peter D. Klein. 2001. NASA/ARMY/BELL XV-15 Tiltrotor Low-Noise Terminal Area Operations Flight Research Program. Textron Bell Helicopter. https://ntrs.nasa.gov/citations/20010059380
- Edwards, Bryan, Peter D. Klein, Colby O. Nicks, et al. 1999. “XV-15 Tiltrotor Low Noise Approach Operations.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f55-00187
- Egbert, Norman, and Theodore McKain. 1994. “Common Core Development Approach for Allison T406/AE Family of Turboshaft, Turboprop, and Turbofan Engines.” In 30th Joint Propulsion Conference and Exhibit. AIAA 1994-2829. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1994-2829
- Egerton, Harry S., and James E. Fitzpatrick. 1967. The Model K-I6B V/STOL Research Amphibious Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0674529
- Egolf, T. Alan, and Anton J. Landgrebe. 1984. Generalized Wake Geometry for a Helicopter Rotor in Forward Flight and Effect of Wake Deformation on Airloads. https://doi.org/10.4050/vfs-f40-1174
- Egolf, T., Brian Wake, and Charles Berezin. 2000. “Recent Rotor Wake Simulation and Modeling Studies at United Technologies Corporation.” In 38th Aerospace Sciences Meeting and Exhibit. AIAA 2000-115. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2000-115
- Egolf, T. Alan, Brian Wake, and Mark W. Scott. 1995. “Results of a Viscous Flow Analysis for Proprotor Design.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f51-1065
- Ehrich, Frederic F. 1961. “Design and Development Review of the T64 Turboprop/Turboshaft Engine.” In ASME 1961 Gas Turbine Power Conference and Exhibit. American Society of Mechanical Engineers. https://doi.org/10.1115/61-gtp-7
- Ehrich, F., and H. Glessner. 1964. “Design and Development of the t64 Turboprop/ Turboshaft Engine for Operation in V/stol Attitude.” In General Aviation Aircraft Design and Operations Meeting. AIAA 1964-174. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-174
- Eisenberg, J. D. 1982. “Rotorcraft Convertible Engines for the 1980s.” In Rotary Wing Propulsion System Specialist Meeting. https://ntrs.nasa.gov/citations/19830003821
- Eisenberg, Joseph D. 1990. “The Selection of Convertible Engines with Current Gas Generator Technology for High Speed Rotorcraft.” In NASA. https://ntrs.nasa.gov/citations/19900059878
- Eisenberg, Joseph D., and Jeffrey V. Bowles. 1986. “Folding Tilt Rotor Demonstrator Feasibility Study.” In Proceedings of the Vertical Flight Society Forum 42 - Washington D.C. 1986. The Vertical Flight Society. https://doi.org/10.4050/vfs-f42-2001
- El-Sayed, Ahmed F. 2016. “Shaft Engines Turboprop, Turboshaft, and Propfan.” In Fundamentals of Aircraft and Rocket Propulsion. Springer London. https://doi.org/10.1007/978-1-4471-6796-9_7
- Elliott, Andrew S. 1991. “Dynamic Response of a Variable-Speed Rotor during Rapid Shaft Tilt.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f47-2018
- Ellis, Matthew, Nicholas Bojdo, and Antonio Filippone. 2020. “Influence of Turboshaft Engine Architecture on Ash Particle Deposition: Reduced Order Model Application.” In Volume 2B: Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2020-15203
- Ellis, Matthew, Nicholas Bojdo, and Antonio Filippone. 2021. “Influence of Turboshaft Engine Architecture on Ash Particle Deposition: Reduced Order Model Application.” Preprint, . https://doi.org/10.1115/1.0002725v
- Emelyanova, O. V., G. K. Kazaryan, A. S. Martinez Leon, and S. F. Jatsun. 2017. “The Synthesis of Electric Drives Characteristics of the UAV of “Convertiplane–Tricopter” Type.” MATEC Web of Conferences 99: 02002. https://doi.org/10.1051/matecconf/20179902002
- Engelland, Shawn. 1991. “Evaluation of the Longitudinal Stability and Control Characteristicsof a Mixed-Flow Remote-Lift STOVL Aircraft in Transition and Hover.” In Aircraft Design and Operations Meeting. AIAA 1991-3185. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-3185
- Engle, F. V., and K. W. Sambell. 1969. “Performance Aspects of Folding-Proprotor V/STOL Aircraft.” In Proceedings of the Vertical Flight Society Forum 25 - Washington, D.C. 1969. The Vertical Flight Society. https://doi.org/10.4050/vfs-f25-005
- English, R. B., K. R. Marsh, and J. J. Santamaria. 1966. A Study of V/STOL Concepts for Short-Haul Transportation Use. NASA. https://ntrs.nasa.gov/citations/19660063601
- Envia, Edmane. 1992. “An Asymptotic Theory of Supersonic Propeller Noise.” In In: DGLR(AIAA Aeroacoustics Conference, 14th, Aachen, Germany, May 11-14, 1992, Proceedings. Vol. 1 (A93-19126 05-71). https://ntrs.nasa.gov/citations/19930035172
- Equipment, Eg-1E Gas Turbine Test Facilities and. 2013. Turboshaft/Turboprop Gas Turbine Engine Test Cell Correlation. https://doi.org/10.4271/arp4755b
- Equipment, Eg e Gas Turbine Test Facilities And, and null Null. 2007. Design Considerations for Enclosed Turboshaft Engine Test Cells. https://doi.org/10.4271/air4989
- Erhard, Racheal M., and Juan Jose Alonso. 2024. “A Quasi-Prescribed Vortex Wake Method Capturing Rotor Wake Distortion.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1116
- Erhart, R. G., R. L. Marr, Daniel C. Dugan, and Laurel G. Schroers. 1980. “Operating Flexibility Exhibited in Flight Test of the XV-15 Tilt Rotor Research Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f36-058
- Erickson, R. E., R. M. Kufeld, J. L. Cross, R. W. Hodge, W. F. Ericson, and R. D. G. Carter. 1984. NASA Rotor System Research Aircraft Flight-Test Data Report: Helicopter and Compound Configuration. NASA-TM-85843. NASA. https://ntrs.nasa.gov/citations/19840024311
- Ernst, Katie M., Emilie Roth, Scott Scheff, et al. 2019. “A Strategy for Determining Optimal Crewing in Future Vertical Lift: Human-Automation Function Allocation.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14558
- Escobar, Daniel, and Hyeonsoo Yeo. 2022. “Performance and Loads of a Wing-Offset Compound Helicopter.” In AIAA SCITECH 2022 Forum. AIAA 2022-0929. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-0929
- Escobar, Daniel, and Hyeonsoo Yeo. 2023. “Performance and Loads of a Wing-Offset Compound Helicopter.” Journal of the American Helicopter Society 68 (3): 32002–14. https://doi.org/10.4050/jahs.68.032002
- Eshcol, Ritu M., Yuvraj Dewan, Chong Zhou, and Lakshmi N. Sankar. 2018. “Optimization of S-76 Rotor Blade for Hover Performance.” In 2018 AIAA Aerospace Sciences Meeting. AIAA 2018-1782. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-1782
- Eshlemen, J. 1985. “Ground Effects on V/STOL and STOL Aircraft: A Survey.” In Aircraft Design Systems and Operations Meeting. AIAA 1985-4033. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-4033
- Eskey, Megan A., and Samuel B. Wilson III. 1989. Piloted Simulations of a V/STOL Aircraft. ARC-11807. NASA Ames Research Center, Moffett Field, CA. https://ntrs.nasa.gov/citations/19890000032
- Eskey, M. A., S. B. Wilson III, W. Valckenaere, and J. P. Lareau. 1984. “Twin Tilt Nacelle V/STOL Aircraft.” In SAE. https://ntrs.nasa.gov/citations/19850057057
- Etemadi, Nikoo. n.d. “Whirl Flutter Investigation for Rotor Discs and Two-Bladed Systems.” PhD diss., Carleton University. https://doi.org/10.22215/etd/2025-16652
- European Union Aviation Safety Agency. 2023. Type-Certificate Data Sheet for PW308 Series Engines. EASA.IM.E.057, Issue 06. European Union Aviation Safety Agency. https://www.easa.europa.eu/en/downloads/7705/en
- European Union Aviation Safety Agency. 2025. Type-Certificate Data Sheet for General Electric Company CT7-Series Engines. EASA.IM.E.010, Issue 10. European Union Aviation Safety Agency. https://www.easa.europa.eu/en/downloads/7783/en
- Ezell, William, and Jerry P. Higman. 2002. “Development of a Real-Time Multi-Rotorcraft Simulator for Army Aviation Test and Evaluation.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f58-00053
- Faass, Robert L. 1998. “Light Weight Drive Couplings for Tiltrotor and Other VSTOL Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f54-00080
- Fabri, Jean, and Raymond Siestrunck. 1953. Study of the Supersonic Propeller. NACA-TM-1355. NASA. https://ntrs.nasa.gov/citations/19930093875
- Fakhre, Ali, Vassilios Pachidis, Ioannis Goulos, Mahmood Tashfeen, and Pericles Pilidis. 2013. “Helicopter Mission Analysis for a Regenerated Turboshaft.” In Volume 2: Aircraft Engine; Coal, Biomass and Alternative Fuels; Cycle Innovations. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2013-94971
- Falarski, M. D. 1979. “Wind-Tunnel Investigation of Highly Maneuverable Supersonic V/STOL Fighter.” In V/STOL Aerodyn. Workshop. https://ntrs.nasa.gov/citations/19790017846
- Fan, Yourong, Xinhua Wang, Zhe Hu, and Kai Zhang. 2022. “Nonlinear Modeling and Transition Corridor Calculation of a Tiltrotor without Cyclic Pitch.” MATEC Web of Conferences 355: 01022. https://doi.org/10.1051/matecconf/202235501022
- Fanucci, J., E. Gibbs, and O. Skujins. 1969. “Rotor Downwash in Ground Effect in the Presence of a Step.” In VTOL Research, Design, and Operations Meeting. AIAA 1969-225. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-225
- Farassat, F., Yung-Jang Lee, H. Tadghighi, and R. Holz. 1991. “High-Speed Helicopter Rotor Noise: Shock Waves as a Potent Source of Sound.” In In: AHS and Royal Aeronautical Society, Technical Specialists’ Meeting on Rotorcraft Acoustics(Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings (A93-29401 10-71). https://ntrs.nasa.gov/citations/19930045406
- Farassat, F., M. K. Myers, and M. H. Dunn. 1990. “High Speed Propeller Acoustics and Aerodynamics — A Boundary Element Approach.” In Boundary Element Methods in Engineering. Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-84238-2_64
- Farrell, M. K., Jim C. Narramore, and William K. Grauer. 1994. “Aerodynamic Evaluation of the V-22 Osprey Wing Section.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f50-2015
- Faulkner, H. B. 1974. The Cost of Noise Reduction in Commercial Tilt Rotor Aircraft. NASA-CR-137552. NASA. https://ntrs.nasa.gov/citations/19750005796
- Faust, Jan-Arun, Yong Su Jung, James D. Baeder, André Bauknecht, and Juergen Rauleder. 2021. “Interactional Aerodynamic Analysis of an Asymmetric Lift-Offset Compound Helicopter in Forward Flight.” Journal of the American Helicopter Society 66 (3): 1–17. https://doi.org/10.4050/jahs.66.032011
- Faye, Robert E., Fort F. Felker, and Jeffrey S. Light. 1987. An Assessment of Upper Surface Blowing for the Reduction of Tilt Rotor Download. Calif. Polytechnic Inst. https://ntrs.nasa.gov/citations/19950028590
- Feasibility Study for Convertible Engine Torque Converter. 1985. NASA-CR-175082. NASA. https://ntrs.nasa.gov/citations/19860021261
- Feddersen, R., and R. Cea. 1977. “Propulsion Cycle Effects for a Two-Fan V/STOL Aircraft.” In V/STOL Conference. AIAA 1977-580. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1977-580
- Fei, Zhongyang, and David Peters. 2012. “Eigenvalues and Mode Shapes for the Complete Rotor Dynamic-Wake Model.” In 30th AIAA Applied Aerodynamics Conference. AIAA 2012-2910. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2012-2910
- Fei, Zhongyang, and David A. Peters. 2013. “Applications of Generalized Dynamic Wake Theory to the Flow in a Rotor Wake.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-061
- Feil, Roland, Juergen Rauleder, and Manfred Hajek. 2016. “Aeromechanics Analysis of a Coaxial Rotor System in Hover and High-Advance-Ratio Forward Flight.” In 34th AIAA Applied Aerodynamics Conference. AIAA 2016-3419. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-3419
- Feil, Roland, Markus Rinker, and Manfred Hajek. 2017. “Flight Testing of a Coaxial Ultralight Rotorcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12183
- Feistel, T. W., E. C. Stewart, R. M. Gerdes, and K. R. Smith Jr. 1972. “A Look at V/STOL for Business Aircraft.” In Society of Automotive Engineers. https://ntrs.nasa.gov/citations/19720041928
- Fejtek, Ian G. 1993. Navier-Stokes Flowfield Computation of Wing/rotor Interaction for a Tilt Rotor Aircraft in Hover. NASA-CR-4532. NASA. https://ntrs.nasa.gov/citations/19940006303
- Fejtek, Ian, and Leonard Roberts. 1992a. “Navier-Stokes Computation of Wing Leading Edge Tangential Blowing for a Tilt Rotor in Hover.” In 10th Applied Aerodynamics Conference. AIAA 1992-2608. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-2608
- Felker, Fort F. 1988. A Review of Tilt Rotor Download Research. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19900055382
- Felker, Fort F. 1992. Wing Download Results from a Test of a 0.658-Scale V-22 Rotor and Wing. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20000021396
- Felker, Fort F. 1993. Accuracy of Tilt Rotor Hover Performance Predictions. NASA-TM-104023. NASA. https://ntrs.nasa.gov/citations/19930076326
- Felker, F. F., M. D. Betzina, and D. B. Signor. 1985. Performance and Loads Data from a Hover Test of a Full-Scale XV-15 Rotor. NASA-TM-86833. NASA. https://ntrs.nasa.gov/citations/19860005773
- Felker, Fort F., and Jeffrey S. Light. 1986. “Rotor/wing Aerodynamic Interactions in Hover.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f42-1025
- Felker, F. F., M. D. Maisel, and M. D. Betzina. 1986a. “Full-Scale Tilt-Rotor Hover Performance.” American Helicopter Society, Journal 31. https://ntrs.nasa.gov/citations/19860053032
- Felker, Fort F., Patrick R. Shinoda, Ruth M. Heffernan, and Hugh F. Sheehy. 1990. Wing Force and Surface Pressure Data from a Hover Test of a 0.658-Scale V-22 Rotor and Wing. NASA-TM-102244. NASA. https://ntrs.nasa.gov/citations/19920013621
- Felker, Fort F., David B. Signor, Larry A. Young, and Mark D. Betzina. 1987. Performance and Loads Data from a Hover Test of a 0.658-Scale V-22 Rotor and Wing. NASA-TM-89419. NASA. https://ntrs.nasa.gov/citations/19870015863
- Felker, Fort F., Larry A. Young, and David B. Signor. 1986b. Performance and Loads Data from a Hover Test of a Full-Scale Advanced Technology XV-15 Rotor. NASA-TM-86854. NASA. https://ntrs.nasa.gov/citations/19870014976
- Feng, Xu, Jia Cui, Yi Zhang, et al. 2026. “Numerical Simulation of Downwash Airflow of Rescue Helicopter Rotor.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/2026-99-1294
- Fenny, Carlos A., and Kenneth E. Hart. 2000. “Design and Development of a Pylon Conversion Actuation System for a Civil Tiltrotor Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f56-00029
- Ferguson, Sam, and Mark E. Dreier. 2005. “Empirical Wake Turbulence Model of Tiltrotor Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/2005-01-3182
- Ferguson, S. W., G. D. Hanson, and G. B. Churchill. 1984. Simulation Validation of the XV-15 Tilt-Rotor Research Aircraft. Systems Technology, Inc. https://ntrs.nasa.gov/citations/19850049865
- Ferguson, Kevin, and Douglas G. Thomson. 2013. “A Flight Dynamics Investigation of Compound Helicopter Configurations.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-067
- Ferguson, Kevin, and Douglas G. Thomson. 2014. “A Performance Analysis of Compound Helicopter Configurations.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0070-2014-9571
- Ferguson, Kevin, and Douglas G. Thomson. 2015b. “Maneuverability Assessment of a Compound Helicopter Configuration.” Journal of the American Helicopter Society 61 (1): 1–15. https://doi.org/10.4050/jahs.61.012008
- Ferguson, Kevin, and Douglas Thomson. 2015c. “Performance Comparison between a Conventional Helicopter and Compound Helicopter Configurations.” Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 229 (13): 2441–56. https://doi.org/10.1177/0954410015577997
- Ferguson, K., and D. Thomson. 2016. “Examining the Stability Derivatives of a Compound Helicopter.” Aeronautical Journal 121 (1235): 1–20. https://doi.org/10.1017/aer.2016.101
- Ferguson, Kevin, Douglas G. Thomson, and Dave Anderson. 2017. Investigation of a Compound Helicopter Flying the Depart and Abort Mission Task Element. https://doi.org/10.4050/sm_2017_hq-3260
- Ferrand, Antoine, Marc Bellenoue, Yves Bertin, Radu Cirligeanu, Patrick Marconi, and Fabien Mercier-Calvairac. 2018. “High Fidelity Modeling of the Acceleration of a Turboshaft Engine during a Restart.” In Volume 1: Aircraft Engine; Fans and Blowers; Marine. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2018-76654
- Ferrand, Antoine, Marc Bellenoue, Yves Bertin, and Patrick Marconi. 2020. “Improvement of Turboshaft Restart Time through an Experimental and Numerical Investigation.” In Volume 1: Aircraft Engine; Fans and Blowers. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2020-14143
- Ferrand, Antoine, Patrick Marconi, Marc Bellenoue, and Yves Bertin. 2021. “Improvement of Turboshaft Restart Time through an Experimental and Numerical Investigation.” Preprint, . https://doi.org/10.1115/1.0002490v
- Ferris, John R. 1961. Liquid Metal Regenerator Feasibility Study for a Light-Weight Turboshaft Engine. Defense Technical Information Center. https://doi.org/10.21236/ad0263594
- Few, D. D., and H. K. Edenborough. 1977. “Tilt-Proprotor Perspective.” Astronautics and Aeronautics 15. https://ntrs.nasa.gov/citations/19780032785
- Filho, João Otávio Falcão Arantes, and Donizeti de Andrade. 2016. “Management Process of a Frequency Response Flight Test for Rotorcraft Flying Qualities Evaluation.” Journal of Aerospace Technology and Management 8 (3): 289–306. https://doi.org/10.5028/jatm.v8i3.644
- Filippone, Antonio, and Nicholas Bojdo. 2010. “Turboshaft Engine Air Particle Separation.” Progress in Aerospace Sciences 46 (5–6): 224–45. https://doi.org/10.1016/j.paerosci.2010.02.001
- Filippone, Antonio, and Nicholas Bojdo. 2023. “Rotorcraft Propulsion Systems.” In Springer Aerospace Technology. Springer International Publishing. https://doi.org/10.1007/978-3-031-12437-2_3
- Fitzwilliams, O. L. L. 1965. “The Control of Turboshaft Engines in Helicopters.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/650014
- “Flight Test of a VTOL Digital Autoland System along Complex Trajectories.” 1979. In Guidance and Control Conference. AIAA 1979-1703. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1979-1703
- Flood, W. L., and J. N. Cartwright. 1977. “Simulated Flight Endurance Testing of a Small Helicopter Turboshaft Engine.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f33-044
- Floros, Matthew, and Wayne Johnson. 2003. Stability Analysis of Slowed-Rotor Compound Helicopter Configurations. https://doi.org/10.4050/sm_2003_ae-4319
- Floros, Matthew, and Wayne R. Johnson. 2004. Stability Analysis of the Slowed-Rotor Compound Helicopter Configuration. https://doi.org/10.4050/vfs-f60-000160
- Floros, Matthew W., and Wayne Johnson. 2007a. Stability Analysis of the Slowed-Rotor Compound Helicopter Configuration. Army Research Lab. https://ntrs.nasa.gov/citations/20070035908
- Floros, Matthew, and Wayne R. Johnson. 2007b. “Stability and Control Analysis of the Slowed-Rotor Compound Helicopter Configuration.” Journal of the American Helicopter Society 52 (3): 239–53. https://doi.org/10.4050/jahs.52.239
- Floros, Matthew, and Wayne R. Johnson. 2009. “Performance Analysis of the Slowed-Rotor Compound Helicopter Configuration.” Journal of the American Helicopter Society 54 (2): 22002–2200212. https://doi.org/10.4050/jahs.54.022002
- Floros, Matthew, and Hao Kang. 2017. “Tiltrotor Whirl Flutter Stability Augmentation Using Active Wing Tips.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12057
- Folenta, Dezi, and William Lebo. 1988. Design, Manufacture and Spin Test of High Contact Ratio Helicopter Transmission Utilizing Self-Aligning Bearingless Planetary (SABP). NASA-CR-4155. NASA. https://ntrs.nasa.gov/citations/19880015591
- Foley, W., and R. Woodrey. 1980. “Vectored Engine over Wing Concept for V/STOL Supersonic Fighter.” In Aircraft Systems Meeting. AIAA 1980-1877. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-1877
- Ford, Terry. 1999. “Tiltrotor Progress.” Aircraft Engineering and Aerospace Technology 71 (1): 42–47. https://doi.org/10.1108/00022669910252169
- Ford CEng MRAes, Terry. 1988. “Tiltrotor Technology.” Aircraft Engineering and Aerospace Technology 60 (11): 2–6. https://doi.org/10.1108/eb036704
- Foskey, Christopher E. 2024. Drag Reducing Spinner for High Speed Stop Fold Rotor. https://patents.google.com/patent/US12030623B2/en
- Foskey, Christopher Edward, and Colton Gilliland. 2022. Lift Engine Auxiliary Thrust System for Stop Fold Aircraft. https://patents.google.com/patent/US11325719B2/en
- Foskey, Christopher Edward, and Troy Cyril Schank. 2021. Stowed Blade Pneumatic Clamp. https://patents.google.com/patent/US20210078695A1/en
- Fosnaugh III and Carl J. 2003. How We Provide for the Common Defense: A Review of the Interactive Decision-Making Process of the V-22 Osprey Program from 1981 through 1992. Defense Technical Information Center. https://doi.org/10.21236/ada442069
- Foster, Malcolm. 2003. “Evolution of Tiltrotor Aircraft.” In AIAA International Air and Space Symposium and Exposition: The Next 100 Years. AIAA 2003-2652. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-2652
- Foster, G. V., and O. A. Morris. 1960. Aerodynamic Characteristics in Pitch at a Mach Number of 1.97 of Two Variable-Wing- Sweep V/STOL Configurations with Outboard Wing Panels Swept Back 75 Deg. NASA-TM-X-322. NASA. https://ntrs.nasa.gov/citations/19660011612
- Foster, G. V., and O. A. Morris. 1961. Static Longitudinal and Lateral Aerodynamic Characteristics at a Mach Number of 2.20 of a V/STOL Airplane Configuration with a Variable-Sweep Wing and with a Skewed Wing Design. NASA-TM-X-521. NASA. https://ntrs.nasa.gov/citations/19660013086
- Foulke, William K., and J. Eric Rhodes. 1965. “The XH-51A Rigid Rotor Compound Helicopter Program.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f21-001
- Fradenburgh, Evan A., and Edmond F. Kiely. 1964. “Development of Dynamic Model Rotor Blades for High Speed Helicopter Research.” Journal of the American Helicopter Society 9 (1): 3–20. https://doi.org/10.4050/jahs.9.1.3
- Fradenburgh, Evan A., and Richard M. Segel. 1965. “Model and Full Scale Compound Helicopter Research.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f21-004
- Fraga, D., and J. Liiva. 1972. “Design Studies and Model Tests of the Stowed Tilt-Rotor Concept.” In 4th Aircraft Design, Flight Test, and Operations Meeting. AIAA 1972-804. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1972-804
- Franklin, J. A. 1986. “Control of V/STOL Aircraft.” Aeronautical Journal 90. https://ntrs.nasa.gov/citations/19860061264
- Franklin, James A. 2000. V/STOL Dynamics, Control, and Flying Qualities. NASA/TP-2000-209591. NASA. https://ntrs.nasa.gov/citations/20010038495
- Franklin, James A., and Michael W. Stortz. 1989. “Flight/propulsion Control Integration for V/STOL Fighter/attack Aircraft.” In National Technical Specialists’’ Meeting on Tactical V/STOL. https://ntrs.nasa.gov/citations/19900051475
- Frealle, Mm. Claveau /. 1996. “Advanced Fuel Control System for Turboshaft Engines.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f52-2056
- Frederick, R., Jr., Kora Davis, Mandy Hopper, and Alison Symes. 1999. “Preliminary Design of Rotorcraft with Multi-Disciplinary, International Teams.” In 35th Joint Propulsion Conference and Exhibit. AIAA 1999-2845. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1999-2845
- Fredericks, William J., Mark D. Moore, and Ronald C. Busan. 2013. “Benefits of Hybrid-Electric Propulsion to Achieve 4x Increase in Cruise Efficiency for a VTOL Aircraft.” In American Inst. of Aeronautics and Astronautics. https://ntrs.nasa.gov/citations/20140001088
- Freeman, D. C., Jr., and W. A. Newsom Jr. 1966. Flight Investigation of Stability and Control Characteristics of a 0.18-Scale Model of a Four-Duct Tandem V/STOL Transport. NASA-TN-D-3055. NASA. https://ntrs.nasa.gov/citations/19660012981
- Frey, Felix, Jakob Thiemeier, Constantin Öhrle, Manuel Keßler, and Ewald Krämer. 2019. “Aerodynamic Interactions on Airbus Helicopters’ Compound Helicopter RACER in Cruise Flight.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14505
- Frey, Felix, Jakob Thiemeier, Constantin Öhrle, Manuel Keßler, and Ewald Krämer. 2020. “Aerodynamic Interactions on Airbus Helicopters’ Compound Helicopter RACER in Cruise Flight.” Journal of the American Helicopter Society 65 (4): 1–14. https://doi.org/10.4050/jahs.65.042001
- Frey, Felix, Jakob Thiemeier, Constantin Öhrle, Manuel Keßler, and Ewald Krämer. 2021. “Aerodynamic Interactions on Airbus Helicopters’ Compound Helicopter RACER in Hover.” Journal of the American Helicopter Society 67 (1): 1–17. https://doi.org/10.4050/jahs.67.012007
- Frick, J. K. D., and W. Johnson. 1974. Optimal Control Theory Investigation of Proprotor/wing Response to Vertical Gust. NASA-TM-X-62384. NASA. https://ntrs.nasa.gov/citations/19750001985
- Friend, C. 1964. “A Fundamental Study of Reaction Control Criteria for Jet Vtol Aircraft.” In Military Aircraft Systems and Technology Meeting. AIAA 1964-787. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-787
- Frith, Peter C. 1992. “The Effect of Compressor Rotor Tip Crops on Turboshaft Engine Performance.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/92-gt-083
- Frith, P. C. 1994. “The Effect of Compressor Rotor Tip Crops on Turboshaft Engine Performance.” Journal of Engineering for Gas Turbines and Power 116 (1): 184–89. https://doi.org/10.1115/1.2906790
- Frost, Chad, James Franklin, and Gordon Hardy. 2002. “Evaluation of Flying Qualities and Guidance Displays for an Advanced Tilt-Wing STOL Transport Aircraft in Final Approach and Landing.” In 2002 Biennial International Powered Lift Conference and Exhibit. AIAA 2002-6016. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-6016
- Fry, Bernard L. 1965. “Low-Speed Aerodynamic Flight Boundaries and Control Aspects OF TILT-WING AIRCRAFT.” In Proceedings of the Vertical Flight Society Forum 21 - Washington, D.C. 1965. The Vertical Flight Society. https://doi.org/10.4050/vfs-f21-002
- Fry, B. 1967. “Assessment of Commercial VTOL Aircraft with Rotor or Propeller Lift Systems.” In Commercial Aircraft Design and Operation Meeting. AIAA 1967-411. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1967-411
- Fry, B. L. 1968. Supplement to Feasibility of V/STOL Concepts for Short-Haul Transport Aircraft. NASA-CR-743/1/. NASA. https://ntrs.nasa.gov/citations/19680025705
- Fry, B. L., and J. M. Zabinsky. 1967. Feasibility of V/STOL Concepts for Short-Haul Transport Aircraft. NASA-CR-743. NASA. https://ntrs.nasa.gov/citations/19670019040
- Fuchs, Fabian, Christian Schäffer, and Volker Gümmer. 2018. “Experimental Investigation of a Radial Turboshaft Engine Intake.” In 2018 Joint Propulsion Conference. AIAA 2018-4747. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-4747
- Fuentes, Guido, H. Ceron-Munoz, and Julio Parra. 2013. “Design of an Advanced Turboprop Aircraft for Regional Operations with Ninety Passengers.” In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. AIAA 2013-24. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2013-24
- Gabriele, Gary. 1991. “Computer-Aided Conceptual Design of Rotorcraft.” In Aircraft Design and Operations Meeting. AIAA 1991-3099. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-3099
- Gaffey, T. M., and M. D. Maisel. 1974. “Measurement of Tilt Rotor VTOL Rotor Wake-Airframe Ground Aerodynamic Interference for Application to Real Time Flight Simulation.” In AGARD V/STOL Aerodyn.. https://ntrs.nasa.gov/citations/19750005744
- Gaffin, W. O., and Simon Wilcox. 1967. “Turbofan/Turboshaft Powerplant for Composite Helicopters.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/670352
- Gagliardi, Giuseppe Maurizio, Aniello Daniele Marano, and Francesco Marulo. 2022. “Numerical and Experimental Investigation of Whirl Flutter Characteristics in a Small-Scale Demonstrator.” Journal of Aerospace Engineering 35 (3): 04022025. https://doi.org/10.1061/(asce)as.1943-5525.0001422
- Gahlot, Aishwerya Singh, and Lakshmi N. Sankar. 2024. “Effects of Rain on Hover and Forward Flight Performance of the S-76 Rotor.” In AIAA SCITECH 2024 Forum. AIAA 2024-1117. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1117
- Gainutdinov, V. G., T. Yu. Gainutdinova, R. A. Sharifullin, N. A. Mysovskii, and L. A. Fazliev. 2026. “On the Algorithm for Designing the Required Thrust of Vertical Takeoff and Landing Aircraft Power Units.” Russian Aeronautics 69 (1): 19–29. https://doi.org/10.3103/s1068799826010022
- Galdorisi, George, and Tom Phillips. 2011. “Navy Combat Search and Rescue: Challenges and Opportunities.” In AIAA Centennial of Naval Aviation Forum “100 Years of Achievement and Progress”. AIAA 2011-7029. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2011-7029
- Gali, Sai Vishal, Carlos E. S. Cesnik, Cristina Riso, and Jasmine C. Chang. 2024. “Inflow Model Effects on Propeller Whirl Flutter.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1156
- Gali, Sai Vishal, Todd Goehmann, and Cristina Riso. 2023b. “Predicting Whirl Flutter Bifurcations Using Pre-Flutter Output Data.” In AIAA SCITECH 2023 Forum. AIAA 2023-1308. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1308
- Gali, Sai Vishal, and Cristina Riso. 2024. “Output-Based Approach for Tiltrotor Whirl Flutter Bifurcation Analysis.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1077
- Gallaher, Andrew. 2017. “Method for Estimating Inertial Properties of Rotorcraft in Conceptual Design.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12022
- Galles, Matthew B., Michael G. Jones, and Douglas M. Nark. 2022. “An Initial Assessment of Variable Depth Liner Optimization for Ducted Proprotor Applications.” In 28th AIAA/CEAS Aeroacoustics 2022 Conference. AIAA 2022-2821. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-2821
- Gamble, Dustin E. 2023. “World Record Duration Flight of Group 2 Unmanned Aircraft with VTOL and Hybrid Propulsion System Using Solid Oxide Fuel Cell.” In AIAA SCITECH 2023 Forum. AIAA 2023-1725. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1725
- Gandhi, Farhan S., and Jinho Paik. 2007. “Design Optimization for Soft-Inplane Tiltrotor Whirl Flutter Stability Improvement.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f63-000083
- Gao, Honggang. 2022. “A New Control Strategy of Stopped-Rotor Aircraft Based on Manipulation Model.” Aircraft Engineering and Aerospace Technology 94 (10): 1720–30. https://doi.org/10.1108/aeat-10-2021-0314
- Gao, Han, and Ramesh K. Agarwal. 2019. “Numerical Study of a Hovering Helicopter Rotor Blade in Ground Effect.” In AIAA Scitech 2019 Forum. AIAA 2019-1099. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1099
- Gao, W., W. Jiang, Q. Li, and B. Lu. 2025a. “Linear Parameter-Varying Model Order Reduction and Control Design of FLEXOP Demonstrator Aircraft.” Aeronautical Journal 129 (1339): 2648–69. https://doi.org/10.1017/aer.2025.41
- Garhart, Jonathan. 2005. Implementation of Carbon Fiber Composites in Rotorcraft Transmission Housing Applications. https://doi.org/10.4050/vfs-f61-000319
- Garner, Jack E. 1967. A Review of Jet Efflux Studies Applicable to V/STOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0658432
- Garren, J. F., Jr., and J. R. Kelly. 1966. Flight Study of on-off Control for V/STOL AIRCRAFT. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19660015335
- Garren, J. F., Jr., J. R. Kelly, and J. P. Reeder. 1964. Effects of Gross Changes in Static Directional Stability on V/stol Handling Characteristics Based on a Flight Investigation. NASA-TN-D-2477. NASA. https://ntrs.nasa.gov/citations/19640021167
- Garrick, Daniel P., R. Ganesh Rajagopalan, and Kanchan Guntupalli. 2013. “Simulation of Landing Maneuvers of Rotorcraft in Brownout Conditions.” In 2013 International Powered Lift Conference. AIAA 2013-4266. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2013-4266
- Gass, J., Marlin D. Breer, J. J. Kim, and D. Kneeling. 1986. “Sand Separator Efficiency Calculation for the JVX Tilt Rotor Aircraft Inlet.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f42-2029
- Gatlin, Maia, and Cristina Riso. 2024. “Predicting Whirl Flutter Bifurcations Using Machine Learning.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-0016
- Gaudemaris, Vincent de, Jean-Sébastien Schotté, Antoine Placzek, Laurent Blanc, and Fabrice Thouverez. 2024. “Unsteady Aerodynamic Modeling of Whirl Flutter on a Bending Wing.” Journal of Physics: Conference Series 2647 (11): 112013. https://doi.org/10.1088/1742-6596/2647/11/112013
- Gazzaniga, John, and Gayle Rose. 1992. “Wind Tunnel Performance Results of Swirl Recovery Vanes as Tested with an Advanced High Speed Propeller.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3770. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3770
- Gebril, Ahmed A., and Ashraf M. Kamal. 2023. “Design and Analysis of an Electric Tiltrotor Unmanned Aerial Vehicle.” Journal of Physics: Conference Series 2616 (1): 012008. https://doi.org/10.1088/1742-6596/2616/1/012008
- Gee, T., and A. Novick. 1988. “Advanced Turboprop and Propfan Development and Testing.” In 24th Joint Propulsion Conference. AIAA 1988-3080. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-3080
- General Electric Co Cincinnati Oh. 1964. XV-5A Lift Fan Flight Research Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0447839
- Gennaretti, M., and L. Greco. 2008. “Whirl Flutter Analysis of Prop-Rotors Using Unsteady Aerodynamics Reduced-Order Models.” Aeronautical Journal 112 (1131): 261–70. https://doi.org/10.1017/s0001924000002207
- Gentry, G. L., Jr., and R. J. Margason. 1968. Aerodynamic Characteristics of a Five Jet VTOL Configuration in the Transition Speed Range. NASA-TN-D-4812. NASA. https://ntrs.nasa.gov/citations/19680026609
- George, Albert R. 1996. Tilt Rotor Aircraft Aeroacoustics. NASA-CR-203040. NASA. https://ntrs.nasa.gov/citations/19970004232
- George, M. M., A. A. Perlmutter, and L. J. Butler. 1964. Downwash Impingement Design Criteria for VTOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0608185
- George, Albert R., Charles A. Smith, Martin D. Maisel, and John T. Brieger. 1989. Tilt Rotor Aircraft Aeroacoustics. Cornell University. https://ntrs.nasa.gov/citations/19900041183
- Georgiev, Gabriel. 2025a. “Blade Element – Momentum Aerodynamic Model of a Helicopter Rotor Operating at Low-Reynolds Numbers in Ground Effect.” Aviation 29 (2): 71–81. https://doi.org/10.3846/aviation.2025.23587
- Georgiev, Gabriel. 2025b. “Helicopter Rotor Aerodynamic Characteristics in Ground Effect: Numerical Study.” In The 14th International Scientific Conference TechSys 2025—Engineering, Technologies and Systems. MDPI. https://doi.org/10.3390/engproc2025100013
- Gerald-Yamasaki, Michael. 1996. “Visualizing Time-Dependent Particle Tracing for the V-22 Tiltrotor Aircraft.” In ACM SIGGRAPH 96 Visual Proceedings: The art and interdisciplinary programs of SIGGRAPH ‘96 on - SIGGRAPH ‘96. ACM Press. https://doi.org/10.1145/253607.254070
- Gerdes, R. M. 1977. “A Piloted Simulation of V/STOL Landings aboard a Non-Aviation Ship.” In Naval Postgraduate School Proc. of the Navy(NASA VSTOL Flying Qualities. https://ntrs.nasa.gov/citations/19780011163
- Gerdes, R. M. 1981. The X-14: 24 Years of V/STOL Flight Testing. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19820031392
- Gerdes, Ronald. 1993. “Lift-Fan Aircraft: Lessons Learned from XV-5 Flight Experience.” In International Powered Lift Conference. AIAA 1993-4838. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-4838
- Gerlach, T. 2011. “Visualisation of the Brownout Phenomenon, Integration and Test on a Helicopter Flight Simulator.” Aeronautical Journal 115 (1163): 57–63. https://doi.org/10.1017/s0001924000005364
- Germanowski, Peter J., Brandon L. Stille, and Michael P. Strauss. 2010. Technology Assessment for Large Vertical-Lift Transport Tiltrotors. NASA/CR-2010-216384. NASA. https://ntrs.nasa.gov/citations/20110008354
- Gerosa, Giacomo, Andrea Zanoni, Simone Panza, Pierangelo Masarati, and Marco Lovera. 2018. “A Handling Qualities Oriented Approach to Rotorcraft Conceptual Design.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12718
- Gertsma, L. W., and Steve Zigan. 1973. “Propulsion System for Research VTOL Transports.” In ASME 1973 International Gas Turbine Conference and Products Show. American Society of Mechanical Engineers. https://doi.org/10.1115/73-gt-24
- Gervais, Marc. 2001. “Tiltrotor Blade-Vortex Interaction (BVI) Noise Control through Non-Unique Longitudinal Force Trim.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f57-00151
- Gervais, Marc, and Fredric Schmitz. 2002. “Tiltrotor BVI Noise Reduction through Flight Trajectory Management & Configuration Control.” In 8th AIAA/CEAS Aeroacoustics Conference & Exhibit. AIAA 2002-2544. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-2544
- Gervais, Marc, and Fredric Schmitz. 2003. “Tiltrotor BVI Noise Abatement Using Flight Path Management and Configuration Control.” In AIAA Guidance, Navigation, and Control Conference and Exhibit. AIAA 2003-5409. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-5409
- Gervais, Marc, and Fredric H. Schmitz. 2004. “Tiltrotor BVI Noise Reduction through Flight Trajectory Management & Configuration Control.” Journal of the American Helicopter Society 49 (4): 436–44. https://doi.org/10.4050/jahs.49.436
- Gervais, Marc, and Fredric H. Schmitz. 2005. Neural Network Modeling of Measured Tiltrotor Acoustics for Designing Low-Noise Approach Profiles. https://doi.org/10.4050/vfs-f61-000253
- Geuther, Steven C., David D. North, and Ronald C. Busan. 2020. Investigation of a Tandem Tilt-Wing VTOL Aircraft in the NASA Langley 12-Foot Low-Speed Tunnel. Langley Research Center. https://ntrs.nasa.gov/citations/20205003178
- Ghanchi, Mohammadshadab A., and Srikanth Gururajan. 2026. “Lessons Learned from the Design, Development, and Subscale Flight Testing of a Hybrid-VTOL UAS.” In AIAA SCITECH 2026 Forum. AIAA 2026-1866. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-1866
- Ghareeb, Nancy. 1964. Programs for Machine Computation of Rotor Blade Downwash. Defense Technical Information Center. https://doi.org/10.21236/ad0619285
- Ghenaiet, Adel, and Akila Halimi. 2014. “Aerodynamic Characterization of a High Speed Propeller.” In Volume 1A: Aircraft Engine; Fans and Blowers. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2014-25765
- Ghiringhelli, G. L., P. Masarati, P. Mantegazza, and M. W. Nixon. 1997. Multi-Body Analysis of a Tiltrotor Configuration. Politecnico di Milano. https://ntrs.nasa.gov/citations/20040110305
- Ghiringhelli, G. L., P. Masarati, P. Mantegazza, and M. W. Nixon. 1999. “Multi-Body Analysis of the 1/5 Scale Wind Tunnel Model of the V-22 Tiltrotor.” In American Helicopter Society 55th Annual FOrum. https://ntrs.nasa.gov/citations/20040086758
- Ghosh, Sayan, Mark Lohry, and R. Rajagopalan. 2010. “Rotor Configurational Effect on Rotorcraft Brownout.” In 28th AIAA Applied Aerodynamics Conference. AIAA 2010-4238. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2010-4238
- Ghosh, Sayan, and R. Ganesh Rajagopalan. 2022. “A Computational Study on Rotor and Fuselage Configuration Effect on Rotorcraft Brownout.” Journal of the American Helicopter Society 67 (1): 1–18. https://doi.org/10.4050/jahs.67.012001
- Gibs, J., W. Stepniewski, and R. Spencer. 1975. “Effect of at-the-Source Noise Reduction on Performance and Weights of a Tilt-Rotor Aircraft.” In 13th Aerospace Sciences Meeting. AIAA 1975-205. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1975-205
- Gibs, J., W. Z. Stepniewski, R. Spencer, and G. Kohler. 1973. Noise Reduction of a Tilt-Rotor Aircraft Including Effects on Weight and Performance. NASA-CR-114648. NASA. https://ntrs.nasa.gov/citations/19730023205
- Gibson, Terry, Michael J. Jagielski, John Robert Barber, William Chung, and Larry A. Young. 2012. Employment of Conceptual Civil Tiltrotor Aircraft in Disaster Response. https://doi.org/10.4050/vfs-f68-000191
- Gilbert, Michael, and Walter Silva. 1987. “The Effects of Aeroelastic Deformation on the Unaugmented Stopped-Rotor Dynamics of an X-Wing Aircraft.” In 14th Atmospheric Flight Mechanics Conference. AIAA 1987-2563. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-2563
- Gilchrist, I. 1983. “High Speed Propeller for the Lear Fan 2100.” In Aircraft Design, Systems and Technology Meeting. AIAA 1983-2465. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-2465
- Gill, J. C., R. V. Earle, and H. M. Mar. 1982. Rotorcraft Convertible Engine Study. NASA-CR-168161. NASA. https://ntrs.nasa.gov/citations/19830019725
- Gill, J. C., and J. D. Sauer. 1983. “Convertible Engines for Fold Tilt Rotor Aircraft and ABC Rotorcraft.” In Proceedings of the Vertical Flight Society Forum 39 - St. Louis, MO 1983. The Vertical Flight Society. https://doi.org/10.4050/vfs-f39-033
- Gillespie, John, and Darius Carter. 2026. “PIV and Load Measurements of a Rotor in a Building Wake.” In AIAA SCITECH 2026 Forum. AIAA 2026-2303. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-2303
- Gilmore, Dilip. 1984. TF34 Convertible Engine Control System Design. https://doi.org/10.4050/vfs-f40-1195
- Gimmestad, D. 1981. “A Preliminary Divergence and Flutter Evaluation of an X-Wing Aircraft.” In Aircraft Systems and Technology Conference. AIAA 1981-1671. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-1671
- Giraud, M. 1986. “Power Level Influence on Architecture of Small Helicopter Turboshaft Engines.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/86-gt-191
- Gires, Ezanee. 2018. “Simulation Framework for Civil Tiltrotor Mission Performance.” International Journal of Engineering and Technology 7 (4.13): 178–87. https://doi.org/10.14419/ijet.v7i4.13.21352
- Girfanov, A. M., and V. V. Pavlov. 2010. “Mathematical Model of Balancing for a Vertical Takeoff and Landing Disk-Wing Aircraft.” Russian Aeronautics (Iz VUZ) 53 (1): 1–8. https://doi.org/10.3103/s1068799810010010
- Giurca, Liviu. 2014. “Vertical Takeoff and Landing Powerplant for Aircraft.” International Journal of Unmanned Systems Engineering 2 (1): 9–14. https://doi.org/10.14323/ijuseng.2014.2
- Giurca, Liviu Grigorian. 2025. “The New Turbo Wing – TW Propulsion for VTOL Aircraft.” Incas Bulletin 17 (1): 87–91. https://doi.org/10.13111/2066-8201.2025.17.1.9
- Glegg, Stewart, and William Devenport. 2024. “Propeller and Open Rotor Noise.” In Aeroacoustics of Low Mach Number Flows. Elsevier. https://doi.org/10.1016/b978-0-443-19112-1.00017-5
- Gleiter, D. 1976. “A Comparison of Two Lift Fan Propulsion Concepts.” In Aircraft Systems and Technology Meeting. AIAA 1976-954. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1976-954
- Gleiter, Donald P. 1985. “Folding Tiltrotor Technology Demonstrator: The Next Step for Tiltrotor Technology.” In SAE Technical Paper Series, vol. 1. SAE International. https://doi.org/10.4271/851844
- Gmirya, Yuriy, and H. Vinayak. 2003. RDS-21 – Rotorcraft Drive System for the 21st Century: Design and Analysis of 5100 Hprds-21 Demonstrator Gearbox. https://doi.org/10.4050/sm_prop_2003-4006
- Godston, J., and C. Reynolds. 1983. “Propulsion System Integration Configurations for Future Prop-Fan Powered Aircraft.” In 19th Joint Propulsion Conference. AIAA 1983-1157. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-1157
- Goff, Adam, Ted Sheridan, Roy Bergman, et al. 2015. Enhanced Magnetic Seals and Installation Practices for Rotorcraft Drive Systems. https://doi.org/10.4050/sm_prop_2015-2603
- Goland, L., N. Miller, and L. Butler. 1964. Effects of Propeller Slipstream on V/STOL Aircraft Performance and Stability. Defense Technical Information Center. https://doi.org/10.21236/ad0608186
- Gold, T., and R. Walchli. 1974. “A Head-up Display for All-Weather Approach and Landing of Tilt-Wing V/STOL Aircraft.” In 6th Aircraft Design,Flight Test and Operations Meeting. AIAA 1974-952. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1974-952
- Goldberger, Stephen. 1966. On the Relative Importance of the Low Speed Control Requirement for V/ STOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0644191
- Golden, Daniel L. 2008. An Experimental Study of Water Injection into a Rolls-Royce Model 250-C20B Turboshaft Gas Turbine. Defense Technical Information Center. https://doi.org/10.21236/ada486636
- Goldsmith, I., and J. Bowles. 1980. “Potential Benefits for Propfan Technology on Derivatives of Future Short- to Medium-Range Transport Aircraft.” In 16th Joint Propulsion Conference. AIAA 1980-1090. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-1090
- Goldsmith, R. H., and D. H. Hickey. 1963a. Characteristics of Aircraft with Lifting-Fan Propulsion Systems for V/STOL. IAS PAPER 63-27. NASA. https://ntrs.nasa.gov/citations/19630015522
- Goldsmith, R. H., and D. H. Hickey. 1963b. Characteristics of Lifting-Fan V/STOL Aircraft. NASA. https://ntrs.nasa.gov/citations/19630027574
- Goldstein, Kewin. 1982. “VTOL and VSTOL Handling Qualities Specifications an Overview of the Current Status.” In Proceedings of the National Specialists Meeting on Handling Qualities, Moffett Field, CA 1982. The Vertical Flight Society. https://doi.org/10.4050/sm_handling_1982-4947
- Goldstein, D. N., R. Hirschkron, and C. E. Smith. 1983. Rotorcraft Convertible Engine Study. NASA-CR-168241. NASA. https://ntrs.nasa.gov/citations/19830026673
- Golub, Robert, David Conner, Lawrence Becker, C. Rutledge, and Rita Smith. 1990. “Some Far-Field Acoustics Characteristics of the XV-15 Tilt-Rotor Aircraft.” In 13th Aeroacoustics Conference. AIAA 1990-3971. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3971
- Golub, Robert A., and Donald S. Weir. 1990. “The ROTONET Prediction System and Initial Comparisons with Far-Field Acoustics Measurements for the XV-15 Tilt-Rotor Aircraft.” In NASA. https://ntrs.nasa.gov/citations/19900059892
- Gong, Haixia, Wei He, Shuping Hou, et al. 2025. “Design and Validation of a New Tilting Rotor VTOL Drone: Structural Optimization, Flight Dynamics and PID Control.” Preprint, . https://doi.org/10.20944/preprints202504.0100.v1
- Gong, Anthony, Mark Tischler, and Ohad Shalev-Eggert. 2023. “Flight Dynamics, Control, and Testing of a Coaxial Helicopter UAV with Folding Rotor Blades.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18189
- Goodarzi, Yahya, Amin Talaeizadeh, Hossein Nejat Pishkenari, and Aria Alasty. 2025. “Optimal Control of an Overactuated Quad-Tiltrotor.” Preprint, . https://doi.org/10.2139/ssrn.5116260
- Goodson, Kenneth W. 1966. “Comparison of Wind-Tunnel and Flight Results on a Four-Propeller Tilt-Wing Configuration.” In Conference on V/STOL and STOL aircraft. https://ntrs.nasa.gov/citations/19660015322
- Goodwin, Kurt. 1999. T700/CT7 Power Growth through Technology Insertion. https://doi.org/10.4050/sm_1999_prop-4421
- Goree, P. F. 1983. T700 Engine Case Study Report. (IDA/OSD R&M (Institute for Defense Analyses/Office of the Secretary of Defense Reliability and Maintainability) Study). Defense Technical Information Center. https://doi.org/10.21236/ada143104
- Goulos, Ioannis. 2016. “An Improved Analytical Approach for Modeling the Effect of Rotor Wake Curvature Using Finite-State Induced Flow Models.” Journal of the American Helicopter Society 61 (3): 1–16. https://doi.org/10.4050/jahs.61.032010
- Gounet, Helene, and S. Lewy. 2012. “Three-Dimensional Sound Directivity around a Helicopter Turboshaft Engine.” Journal of the American Helicopter Society 57 (4): 1–10. https://doi.org/10.4050/jahs.57.042002
- Govindarajan, Bharath, and Ananth Sridharan. 2021. “Hybrid Powertrain Systems for Hybrid VTOL Aircraft.” In AIAA Aviation 2021 Forum. AIAA 2021-3221. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-3221
- Graber, Edwin J. 1987. “Overview of NASA PTA Propfan Flight Test Program.” In Aeropropulsion ‘87. Session 5: Subsonic Propulsion Technology. https://ntrs.nasa.gov/citations/19880006423
- Graber, Edwin J. 1990. “Overview of NASA PTA Propfan Flight Test Program.” In Aeropropulsion 1987. https://ntrs.nasa.gov/citations/19920013293
- Graber, A., A. Rosen, and A. Seginer. 1991. “An Investigation of a Hovering Rotor in Ground Effect.” Aeronautical Journal 95 (945): 161–69. https://doi.org/10.1017/s0001924000023812
- Grady, Nickolas, Michael Frye, and Chunjiang Qian. 2006. “The Instrumentation and Flight Testing of a Rotorcraft Vehicle for Undergraduate Flight Control Research.” In AIAA Modeling and Simulation Technologies Conference and Exhibit. AIAA 2006-6739. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-6739
- Grafton, S. B., and E. L. Anglin. 1975. Free-Flight Model Investigation of a Vertical-Attitude VTOL Fighter with Twin Vertical Tails. NASA-TN-D-8089. NASA. https://ntrs.nasa.gov/citations/19760003954
- Grafton, S. B., and W. A. Newsom Jr. 1971. Flight Investigation of a V/STOL Transport Model with Four Pod-Mounted Lift Fans. NASA-TN-D-6129. NASA. https://ntrs.nasa.gov/citations/19710007948
- Grahame, W. 1968. “The Aerodynamic Effects of Lift Jet and Lift Fan Inlets in Transition Flight.” In 4th Propulsion Joint Specialist Conference. AIAA 1968-637. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1968-637
- Grauer, William K., Michael A. McVeigh, and David J. Paisley. 1988. “Rotor/airframe Interactions on Tiltrotor Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f44-004
- Greatrix, David R. 2012. “Turboprop and Turboshaft Engines.” In Powered Flight. Springer London. https://doi.org/10.1007/978-1-4471-2485-6_8
- Green, David, and Harold Andrews. 1989. “Application of Synthesized Tactics to the Design and Evaluation of VTOL, V/STOL and STOVL Aircraft.” In Aircraft Design and Operations Meeting. AIAA 1989-2143. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2143
- Green, K. A., and J. J. Zanine. 1984. “Estimation of Hot Gas Reingestion for a VTOL Aircraft at the Conceptual Design Stage.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/841555
- Greendyke, R., D. Paxson, M. Schoebeiri, R. Greendyke, D. Paxson, and M. Schoebeiri. 1997. “Dynamic Simulation of a Wave Rotor Topped Turboshaft Engine.” In 33rd Joint Propulsion Conference and Exhibit. AIAA 1997-3143. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1997-3143
- Greene, Peter R. 2020. “Vertical Takeoff and Landing Aircraft, Vertical Takeoff and Landing Ground Effects.” SAE International Journal of Aerospace 14 (1): 33–43. https://doi.org/10.4271/01-14-01-0001
- Greene, Charles H., George J. Kovacich, and Wilby Crawford. 1976. “T700 Engine Flight Test Experience on UTTAS and AAH.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/760934
- Gress, Gary. 2003. “A Dual-Fan VTOL Aircraft Using Opposed Lateral Tilting for Pitch Control.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f59-000269
- Grieb, H., and D. Eckardt. 1986. “Turbofan and Propfan as Basis for Future Economic Propulsion Concepts.” In 22nd Joint Propulsion Conference. AIAA 1986-1474. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-1474
- Griffin, D. 1983. “Supersonic V/STOL: Tandem Fan Concepts.” In Aircraft Design, Systems and Technology Meeting. AIAA 1983-2567. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-2567
- Griffin, K., and F. Jonas. 1983. “Wake Characteristics and Interactions of the Canard/wing Lifting Surface Configuration of the X-29 Forward-Swept Wing Flight Demonstrator.” In Applied Aerodynamics Conference. AIAA 1983-1835. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-1835
- Griffiths, Daniel A., Shreyas Ananthan, and J. Gordon Leishman. 2005. “Predictions of Rotor Performance in Ground Effect Using a Free-Vortex Wake Model.” Journal of the American Helicopter Society 50 (4): 302–14. https://doi.org/10.4050/1.3092867
- Griffiths, Daniel A., and J. Gordon Leishman. 2002. “A Study of Dual-Rotor Interference and Ground Effect Using a Free-Vortex Wake Model.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f58-00166
- Grima, Alexander. 2016. Aerodynamic Characterisation of an Experimental Tilt-Wing Aircraft. ARC-E-DAA-TN31971. Välkommen Till Kth. https://ntrs.nasa.gov/citations/20190027230
- Grönstedt, Tomas, and Guillermo Paniagua. 2026. “System-Level Thermodynamic Assessment and Optimization of a Rotating-Detonation Turboshaft Engine.” Preprint, . https://doi.org/10.2139/ssrn.6675784
- Grunwald, Kalman J. 1961. Aerodynamic Characteristics of a Four-Propeller Tilt-Wing VTOL Model with Twin Vertical Tails, Including Effects of Ground Proximity. NASA-TN-D-901. NASA. https://ntrs.nasa.gov/citations/19980227988
- Guerrero, Lourdes M., and Lloyd D. Corliss. 1991a. Handling Qualities Results of an Initial Geared Flap Tilt Wing Piloted Simulation. SAE-911201. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20000023186
- Guerrero, Lourdes M., and Lloyd D. Corliss. 1991b. Initial Piloted Simulation Study of Geared Flap Control for Tilt-Wing V/STOL Aircraft. NASA-TM-103872. NASA. https://ntrs.nasa.gov/citations/19930001553
- Gul, Seyhan, and Anubhav Datta. 2021. “Fundamental Understanding and Prediction of Loads and Stability of a Full-Scale Hingeless Tiltrotor.” In AIAA Scitech 2021 Forum. AIAA 2021-0090. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-0090
- Gul, Seyhan, and Anubhav Datta. 2022a. “Aeroelastic Loads and Stability of Swept-Tip Hingeless Tiltrotors toward High-Speed Instability-Free Cruise.” Journal of the American Helicopter Society 68 (1): 1–18. https://doi.org/10.4050/jahs.68.012001
- Gul, Seyhan, and Anubhav Datta. 2022b. “Whirl Flutter Test of the Maryland Tiltrotor Rig: Prediction and Validation.” In AIAA SCITECH 2022 Forum. AIAA 2022-0927. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-0927
- Gul, Seyhan, and Anubhav Datta. 2024. “Prediction and Validation of Whirl Flutter Data of the Maryland Tiltrotor Rig.” Journal of the American Helicopter Society 69 (1): 1–11. https://doi.org/10.4050/jahs.69.012011
- Gul, Sehyan, and Hyeonsoo Yeo. 2023. “High-Speed Stability Predictions of Maryland Tiltrotor Rig and Parametric Study.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18038
- Gul, Seyhan, and Hyeonsoo Yeo. 2025. “Whirl Flutter Predictions for Distributed Propulsion Tiltrotor Congurations.” Journal of the American Helicopter Society 70 (1): 1–13. https://doi.org/10.4050/jahs.70.012001
- Günaltılı, Enes. 2025. “Performance Analysis of Helicopter Turboshaft Engines: The Case of Agusta A119 PT6B-37.” ASREL. https://doi.org/10.56753/asrel.2025.1.7
- Gunderson, Charles O. 1961. “Factors Involved in the Design of a VTOL Propulsion System.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/610111
- Guo, Yueping, Michael Czech, and Russell H. Thomas. 2015. “Open Rotor Noise Shielding by Blended-Wing-Body Aircraft.” In 53rd AIAA Aerospace Sciences Meeting. AIAA 2015-1214. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1214
- Guo, Wei, and Joseph Horn. 2009. “Rotor State Feedback Control for Rotorcraft with Variable Rotor Speed.” In AIAA Guidance, Navigation, and Control Conference. AIAA 2009-5797. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2009-5797
- Guo, Zhonghua, Hang Su, Yucheng Zhu, and Feng Feng. 2025b. “Tri Tilt-Rotor Aircraft: Design, Control Model, and Potential Applications in VTOL-Enabled Lunar/Mars Base Construction.” Journal of Physics: Conference Series 3109 (1): 012065. https://doi.org/10.1088/1742-6596/3109/1/012065
- Guo, Yueping, and Russell H. Thomas. 2015a. “System Noise Assessment of Blended-Wing-Body Aircraft with Open Rotor Propulsion.” In 53rd AIAA Aerospace Sciences Meeting. AIAA 2015-1215. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1215
- Guo, Qiang, Xinghu Wang, Linming Yan, Shengjie He, and Gen Sun. 2025a. “Research on the Development of Foreign Tilt Rotor Aircraft.” In Lecture Notes in Mechanical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-95-3016-8_10
- Gupta, Vinit, and James Baeder. 2002. “Investigation of Quad Tiltrotor Aerodynamics in Forward Flight Using CFD.” In 20th AIAA Applied Aerodynamics Conference. AIAA 2002-2812. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-2812
- Ha, Tae H., Keunseok Lee, and John T. Hwang. 2020. “Large-Scale Multidisciplinary Optimization under Uncertainty for Electric Vertical Takeoff and Landing Aircraft.” In AIAA Scitech 2020 Forum. AIAA 2020-0904. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-0904
- Habibnia, Mehdi, Frederico Rodrigues, and Jos Carlos Pscoa. 2020. “A Novel Propulsion System Based on Cycloidal Rotors Coupled with Pair-Wing for VTOL Aircrafts; Cyclo-Craft.” In Progress in Canadian Mechanical Engineering. Volume 3. University of Prince Edward Island. Robertson Library. https://doi.org/10.32393/csme.2020.55
- Hadytama, Muhammad Rafi, and Rianto Adhy Sasongko. 2016. “Dynamics Simulation and Analysis of Transition Stage of Tilt-Rotor Aircraft.” Applied Mechanics and Materials 842: 251–58. https://doi.org/10.4028/www.scientific.net/amm.842.251
- Hah, C., and B. Lakshminarayana. 1980. “Freestream Turbulence Effects on the Development of a Rotor Wake.” In 13th Fluid and PlasmaDynamics Conference. AIAA 1980-1431. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-1431
- Haidar, Ahmad, Luca Belluomini, and Alberto Angelo Trezzini. 2021. “AW609 Civil Tiltrotor Drive Train Torsional Stability Analysis and Certification Test Campaign.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16772
- Halcom, Lancer Drake, and Kyle Thomas Cravener. 2025. Blade Position Control System. https://patents.google.com/patent/US20250100680A1/en
- Halder, Anubhav, Gaurav Makkar, and Farhan Gandhi. 2024. “Gross Weight, CG Position, and Rotor Flapping Prediction for a Compound Helicopter Using Machine Learning.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1328
- Hall, G. 1968. “Experimental Investigations of Ground-Jet Suppression Fences for VTOL Aircraft Prepared Sites.” In 4th Propulsion Joint Specialist Conference. AIAA 1968-639. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1968-639
- Hall, G. 1970. “Model Tests of Concepts to Reduce Hot Gas Ingestion in VTOL Lift Engines.” In 2nd Aircraft Design and Operations Meeting. AIAA 1970-905. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1970-905
- Hall, David, and Russell Cummings. 2002. “Runway Independent STOL Regional Airliner Configuration Studies as Teaching Tools.” In 2002 Biennial International Powered Lift Conference and Exhibit. AIAA 2002-6000. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-6000
- Hall, Edward, and Robert Delaney. 1990. “3D Euler Analysis of Ducted Propfan Flowfields.” In Flight Simulation Technologies Conference and Exhibit. AIAA 1990-3034. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3034
- Hall, Kenneth C., and Steven R. Hall. 2010. “A Variational Method for Computing the Optimal Aerodynamic Performance of Conventional and Compound Helicopters.” Journal of the American Helicopter Society 55 (4): 042006. https://doi.org/10.4050/jahs.55.042006
- Hall, L. P., D. H. Hickey, and J. V. Kirk. 1967a. Aerodynamic Characteristics of a Large-Scale V/STOL Transport Model with Lift and Lift-Cruise Fans. NASA-TN-D-4092. NASA. https://ntrs.nasa.gov/citations/19670024125
- Hall, L., and B. Hodder. 1971. “Aerodynamics of Lift Fan V/STOL Aircraft.” In 8th Annual Meeting and Technical Display. AIAA 1971-981. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1971-981
- Hall, L. P., B. K. Hodder, and J. V. Kirk. 1967b. Large-Scale Wind-Tunnel Investigation of a V/STOL Transport Model with Wing-Mounted Lift Fans and Fuselage-Mounted Lift-Cruise Engines for Propulsion. NASA-TN-D-4233. NASA. https://ntrs.nasa.gov/citations/19670030869
- Hall, Ryan, and Craig Merrett. 2025. “The Design and Manufacture of a Dedicated Aeroelastically Scaled Flutter Demonstrator Aircraft.” In 2025 Regional Student Conferences. AIAA 2025-97196. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-97196
- Hall, G. W., and R. K. Merrill. 1983. Flight Testing the Rotor Systems Research Aircraft (RSRA). NASA-TM-85852. NASA. https://ntrs.nasa.gov/citations/19840005109
- Hall, G. W., and P. M. Morris. 1984. Flight Testing the Fixed Wing Configuration of the Rotor Systems Research Aircraft (RSRA). NASA Ames Research Center. https://ntrs.nasa.gov/citations/19860036326
- Hall, G. W., and P. M. Morris. 1985. Flight Testing the Fixed-Wing Configuration of the Rotor Systems Research Aircraft (RSRA). NASA-TM-86762. NASA. https://ntrs.nasa.gov/citations/19850025822
- Hall, W. E., Jr., and D. Buenz. 1976. Analytical Evaluation of Tilting Proprotor Wind Tunnel Test Requirements. NASA-CR-137826. NASA. https://ntrs.nasa.gov/citations/19760012058
- Hambrey, Jason, Daniel Feszty, Sid-Ali Meslioui, and Jong Park. 2017a. “Acoustic Prediction of High Speed Propeller Noise Using URANS and a Ffowcs Williams-Hawkings Solver.” In 35th AIAA Applied Aerodynamics Conference. AIAA 2017-3917. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-3917
- Hambrey, Jason, Mark Kotwicz Herniczek, Daniel Feszty, Sid-Ali Meslioui, and Jong Park. 2017b. “Comparison of Three Popular Methods for the Prediction of High Speed Propeller Noise.” In 23rd AIAA/CEAS Aeroacoustics Conference. AIAA 2017-4181. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-4181
- Hamel, Peter G. 2012. “Aircraft and Rotorcraft System Identification, Engineering Methods with Flight-Test Examples, 2nd Edition.” Journal of the American Helicopter Society 58 (1): 1–2. https://doi.org/10.4050/jahs.58.017001
- Hamilton, D., and S. Richardson. 1988. “V/STOL Advantages for Ground Attack.” In Aircraft Design, Systems and Operations Conference. AIAA 1988-4478. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-4478
- Hammond, A. D., and H. C. McLemore. 1967. Hot-Gas Ingestion and Jet Interference Effects for Jet V/STOL Aircraft. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19680019386
- Han, Kwang-Ho. 2005. “Tiltrotor Aircraft SCAS Design Using Neural Networks.” Journal of Control Automation and Systems Engineering 11 (3): 233–39. https://doi.org/10.5302/j.icros.2005.11.3.233
- Han, Dong, Edward C. Smith, and Christopher D. Rahn. 2011. Pitch Link Loads Analysis of a Variable Speed Rotor. https://doi.org/10.4050/vfs-f67-000348
- Han, Dong, Dongxia Xu, Long He, and Mingqi Huang. 2023. “Passively Adaptive Variable Rotor Diameter to Improve the Flight Performance of Variable-Speed Rotors.” Transactions of the Japan Society for Aeronautical and Space Sciences 66 (6): 226–33. https://doi.org/10.2322/tjsass.66.226
- Hansen, Darren T. 2001. Combat Search and Rescue: Should It Be a Joint Requirement?. Defense Technical Information Center. https://doi.org/10.21236/ada389899
- Hansen, Bruce D. 2023. VFS Future Advanced Rotorcraft Drive System (FARDS) Review. https://doi.org/10.4050/sm_2023_prop-1002
- Hao, Yingdi, and Cadou Christopher. 2025. “Retrofitting a Turboshaft Engine to an Engine-Fuel Cell Hybrid: A Case Study.” In 2025 Regional Student Conferences. AIAA 2025-100061. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-100061
- Haramura Bastos, Sérvio Túlio S., and Rui Marcos G. de Vasconcellos. 2023. “Whirl-Flutter Control via Piezoelectric Shunt Damping Effect.” In AIAA SCITECH 2023 Forum. AIAA 2023-2220. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-2220
- Haramura Bastos, Sérvio Túlio S., and Rui Marcos G. de Vasconcellos. 2024a. “Hybrid Piezoelectric Control for Whirl-Flutter Instability.” In AIAA Aviation Forum and Ascend 2024. AIAA 2024-4052. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-4052
- Haramura Bastos, Sérvio Túlio S., and Rui Marcos G. de Vasconcellos. 2024b. “Piezoelectric Passive Control for Whirl-Flutter Presenting Structural Discontinuous Effects.” In AIAA Aviation Forum and Ascend 2024. AIAA 2024-3843. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-3843
- Harder, Todd T. 2020. “Development & Testing of a Rotorcraft Engine Transmission Lubrication System.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0076-2020-16372
- Harding, John Craig. n.d. “The Design of a Vertical Takeoff and Landing Aircraft for the General Aviation Market.” PhD diss., Dartmouth College. https://doi.org/10.1349/ddlp.3136
- Harendra, P. B., M. J. Joglekar, T. M. Gaffey, and R. L. Marr. 1973. V/STOL Tilt Rotor Study. Volume 5: A Mathematical Model for Real Time Flight Simulation of the Bell Model 301 Tilt Rotor Research Aircraft. NASA-CR-114614. NASA. https://ntrs.nasa.gov/citations/19730022217
- Hargraves, Charles R. 1961. An Analytical Study of the Longitudinal Dynamics of a Tilt-Wing VTOL. Defense Technical Information Center. https://doi.org/10.21236/ad0268350
- Hariharan, Nathan S., Robert P. Narducci, Edward Reed, and Alan Egolf. 2017. “AIAA Standardized Hover Simulation: Hover Performance Prediction Status and Outstanding Issues.” In 55th AIAA Aerospace Sciences Meeting. AIAA 2017-1429. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-1429
- Hariharan, Nathan, and Lakshmi Sankar. 2000. “A Review of Computational Techniques for Rotor Wake Modeling.” In 38th Aerospace Sciences Meeting and Exhibit. AIAA 2000-114. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2000-114
- Harned, M. S., and R. E. Head. 1965. “Hot Cycle Rotor/Wing High-Speed VTOL Aircraft.” In Proceedings of the 1st National Symposium on V/STOL Aircraft, Subsystem Design and Testing and Operation - Ohio 1965. The Vertical Flight Society. https://doi.org/10.4050/sm_vstol_1965-3034
- Harned, Malcolm, and Harey O. Nay. 1963. “An Economic Assessment of the Hot Cycle Compound Helicopter for VTOL Transport.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/630349
- Harper, C. W. 1966. The Challenge of V/STOL Transport. NASA. https://ntrs.nasa.gov/citations/19660063600
- Harris, Franklin D. 1996. Performance Analysis of Two Early NACA High Speed Propellers with Application to Civil Tiltrotor Configurations. NASA-CR-196702. NASA. https://ntrs.nasa.gov/citations/19960047059
- Harris, Franklin D. 1999. “Technical Note: Twin Rotor Hover Performance.” Journal of the American Helicopter Society 44 (1): 34–37. https://doi.org/10.4050/jahs.44.34
- Harris, Franklin D. 2003. An Overview of Autogyros and the McDonnell XV-1 Convertiplane. NASA/CR-2003-212799. NASA. https://ntrs.nasa.gov/citations/20080022367
- Harris, Franklin D. 2017a. Hover Performance of Isolated Proprotors and Propellers: Experimental Data. NASA/CR-2017-219486. NASA. https://ntrs.nasa.gov/citations/20180000109
- Harris, Franklin D. 2017b. Tiltrotor Conceptual Design. NASA/CR-2017?219474. NASA. https://ntrs.nasa.gov/citations/20190001250
- Hartwig, Louis W., and Walter G. O. Sonneborn. 1971. “Results of High-Speed Flight Research with the High Performance UH-1 Compound Helicopter.” In Proceedings of the Vertical Flight Society Forum 27 - Washington, D.C. 1971. The Vertical Flight Society. https://doi.org/10.4050/vfs-f27-034
- Hasbestan, J. Javanshir, and Touraj Farsadi. 2013. “Pitch – Flap Flutter Instability of Composite High-Speed Rotorcraft Blade with Non-Uniform Cross Section in Unsteady Subsonic Compressible Flow.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-041
- Hassan, Ahmed A. 2004a. “Strategies for Tiltrotor Airframe Download Reduction Using Active Flow Control.” In Proceedings of the Vertical Flight Society Forum 60 - Baltimore, MD 2004. The Vertical Flight Society. https://doi.org/10.4050/vfs-f60-000040
- Hassan, Ahmed A. 2004b. “Strategies for Tiltrotor Airframe Download Reduction Using Active Flow Control.” Journal of the American Helicopter Society 51 (3): 1–17. https://doi.org/10.4050/1.3092886
- Hassan, Ahmed. 2008. “Active Flow Control: A Technology for Advanced Rotorcraft and High-Speed Tiltrotor Aircraft (Invited).” In 4th Flow Control Conference. AIAA 2008-3867. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2008-3867
- Hathaway, Eric, and Farhan Gandhi. 2002. “Modeling Refinements in Simple Tiltrotor Aeroelastic Stability Analyses.” In 43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2002-1604. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-1604
- Hathaway, Eric L., and Farhan S. Gandhi. 2003. “Modeling Refinements in Simple Tiltrotor Whirl Flutter Analyses.” Journal of the American Helicopter Society 48 (3): 186–98. https://doi.org/10.4050/jahs.48.186
- Hathaway, Elic L., and Faihan Gandhi. 2004. “Tiltrotor Whirl Flutter Alleviation Using Actively Controlled Wing Flaperons.” In Proceedings of the Vertical Flight Society Forum 60 - Baltimore, MD 2004. The Vertical Flight Society. https://doi.org/10.4050/vfs-f60-106
- Hathaway, Eric L., and Farhan S. Gandhi. 2007. “Design Optimization for Improved Tiltrotor Whirl Flutter Stability.” Journal of the American Helicopter Society 52 (2): 79–89. https://doi.org/10.4050/jahs.52.79
- Hatta, Keizo, and Masakatsu Matsuki. 1964. “Engines for V/STOL Aircraft.” Journal of the Society of Mechanical Engineers 67 (545): 818–25. https://doi.org/10.1299/jsmemag.67.545_818
- Haugen, Jimmy. 1966. “A Fluidic Approach to Control of VTOL Aircraft.” In Guidance and Control Conference. AIAA 1966-1866. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1966-1866
- Haviland, Stephen T., Dmitry Bershadsky, and Eric N. Johnson. 2016. “Dynamic Modeling and Analysis of a VTOL Freewing Concept.” In AIAA Atmospheric Flight Mechanics Conference. AIAA 2016-1289. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-1289
- Hayama, Kiyoteru, Tomohiro Kudou, and Hiroki Irie. 2021. “Trial Production of Modified Tricopter Based Vertical Take-off Landing Canard Aircraft with Tilt Tail Rotor.” In The Proceedings of The 8th International Conference on Intelligent Systems and Image Processing 2021. The Institute of Industrial Applications Engineers. https://doi.org/10.12792/icisip2021.035
- Hazen, D. C., and E. Seckel. 1950. Theoretical Analysis of the Downwash Distribution over Helicopter Rotors in Forward Flight. Defense Technical Information Center. https://doi.org/10.21236/ada952420
- He, Zhiyuan. 2024. “Design of an Electric Tilt-Wing Martian Aircraft.” Applied and Computational Engineering 66 (1): 79–86. https://doi.org/10.54254/2755-2721/66/20240916
- He, David, Eric R. Bechhoefer, and Miao He. 2026. “Towards Autonomous PHM: An Application to Turboshaft Engine Torque Prediction.” PHM Society Asia-Pacific Conference 5 (1). https://doi.org/10.36001/phmap.2025.v5i1.4565
- He, C. J., and Chyang S. Lee. 1995. “A Free Wake/Ground Vortex Model for Rotors at Low Speed in-Ground-Effect Flight.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f51-1062
- He, Dongjing, Rui Zhang, Cheng Wen, and Jianliang Teng. 2023. “Performance Simulation of Thermodynamic Design for a New Turboshaft Engine.” Journal of Physics: Conference Series 2658 (1): 012048. https://doi.org/10.1088/1742-6596/2658/1/012048
- Head, Robert E. 1966. Supplementary Study Report Rotor/wing Concept Study. Defense Technical Information Center. https://doi.org/10.21236/ad0489862
- Healy, Richard C., Phuriwat Anusonti-Inthra, and Nathan Beals. 2026. “Airfoil Performance Surrogate Modeling for High-Speed Rotorcraft Using HPCMP CREATE TM Sage.” In AIAA SCITECH 2026 Forum. AIAA 2026-0895. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-0895
- Heath, Gregory F., David Fisher, David Lewicki, Stephen Slaughter, and Jason Fetty. 2011. Helical Face Gear Development under the Enhanced Rotorcraft Drive System Program. https://doi.org/10.4050/vfs-f67-000270
- Heeg, Jennifer, Bret K. Stanford, Andrew Kreshock, Jinwei Shen, Christian B. Hoover, and Roger Truax. 2019. “Whirl Flutter and the Development of the NASA X-57 Maxwell.” In International Forum on Aeroelasticity and Structural Dynamics (IFASD 2019). https://ntrs.nasa.gov/citations/20200002633
- Hegde, Navya Thirumaleshwar. 2020. “Design of H-Infinity Controller for VTOL Tiltrotor Unmanned Aerial Vehicle.” Journal of Advanced Research in Dynamical and Control Systems 12 (SP3): 1061–70. https://doi.org/10.5373/jardcs/v12sp3/20201352
- Hegde, Navya Thirumaleshwar, V. I. George, C. Gurudas Nayak, and Aldrin Claytus Vaz. 2021. “Application of Robust H-Infinity Controller in Transition Flight Modeling of Autonomous VTOL Convertible Quad Tiltrotor UAV.” International Journal of Intelligent Unmanned Systems 9 (3): 204–35. https://doi.org/10.1108/ijius-09-2020-0041
- Hegedűs, Ernő. 2017. “A Bell/Boeing V-22 Osprey Konvertiplán és a Jövő Billenőmotoros Repülőgép-Fejlesztései.” Haditechnika 52 (3): 9–15. https://doi.org/10.23713/ht.51.3.02
- Heidelberg, Laurence, and Richard Woodward. 1987. “Advanced Turboprop Wing Installation Effects Measured by Unsteady Blade Pressure and Noise.” In 11th Aeroacoustics Conference. AIAA 1987-2719. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-2719
- Heintzman, Richard J. 1965. V/STOL Visual Flight Simulation Techniques. https://doi.org/10.4050/sm_vstol_1965-4883
- Helicopter and Tiltrotor Flight Dynamics – an Introductory Tour. 2018. Wiley. https://doi.org/10.1002/9781119401087.ch2
- Helicopters, Leonardo, Leonardo Helicopters, Anna Sofia Passarelli D’Onofrio, and Matteo Pecoraro. 2025a. “Roll Take-Off Model for Tiltrotor Preliminary Design.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0245
- Helicopters, Leonardo, Alessandro Velo, Leonardo Helicopters, et al. 2025b. “Uncertainty Estimation in Experimental Whirl Flutter Modes Identification.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0239
- Helming, Klaus. 1994a. “Experimental and Numerical Investigation of Shock Wave within a Swept Shrouded Propfan Rotor.” In Volume 1: Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/94-gt-221
- Helming, K. 1994b. “Numerical Analysis of Sweep Effects in Shrouded Propfan Rotors.” In 30th Joint Propulsion Conference and Exhibit. AIAA 1994-2695. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1994-2695
- Helwani, Moutaz, Scott Schwimley, Gerald A. Shockey, Roger L. Smith, and Thomas L. Thompson. 2001. “Wind Tunnel Test Results for a Canard Rotor/Wing Aircraft Configuration.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f57-00166
- Henderson, C. 1964. “X-22a V/stol Aircraft Research Capabilities.” In Military Aircraft Systems and Technology Meeting. AIAA 1964-786. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-786
- Henderson, C., and M. M. Walters. 1981. “Development and Validation of the V/STOL Aerodynamics and Stability and Control Manual.” In V/STOL Conference. https://ntrs.nasa.gov/citations/19820033368
- Henríquez, Carlos Sosa, and Sigitas Kilikevičius. 2024. Analytical-Numerical Proprotor Performance Envelope Analysis: Exploring Collective Pitch and RPM Sweeps across Varying Flight Conditions. https://doi.org/10.5755/e01.2351-7034.2024.p571-575
- Henry, Zachary S. 1990. Preliminary Design and Analysis of an Advanced Rotorcraft Transmission. https://doi.org/10.4050/sm_rwp_1990-3914
- Henry, Z. 1992. “Advanced Rotorcraft Transmission (ART): Component Test Results.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3366. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3366
- Henry, Zachary S. 1995. Bell Helicopter Advanced Rotocraft Transmission (ART) Program. NASA-CR-195479. NASA. https://ntrs.nasa.gov/citations/19950023117
- Henry, Zachary. 1999. Rotorcraft Propulsion for the New Millennium: Advanced Rotorcraft Transmission II Design Overview. https://doi.org/10.4050/sm_1999_prop-4161
- Heyson, H. H. 1970. Theoretical Study of Conditions Limiting V/STOL Testing in Wind Tunnels with Solid Floor. NASA-TN-D-5819. NASA. https://ntrs.nasa.gov/citations/19700022552
- Heyson, H. H. 1971. Approximate Treatment of V/STOL Wall Interference for Closed Circular Tunnels. NASA-TN-D-6127. NASA. https://ntrs.nasa.gov/citations/19710007892
- Heyson, Harry H., and Kalman J. Grunwald. 1966. “Wind-Tunnel Boundary Interference for V/STOL TESTING.” In Conference on V/STOL and STOL aircraft. https://ntrs.nasa.gov/citations/19660015342
- Hickey, David H. 1956. Full-Scale Wind-Tunnel Tests of the Longitudinal Stability and Control Characteristics of the XV-1 Convertiplane in the Autorotating Flight Range. NACA-RM-A55K21a. NASA. https://ntrs.nasa.gov/citations/19930088539
- Hicks, John, and Neil Matheny. 1987. “Preliminary Flight Assessment of the X-29A Advanced Technology Demonstrator.” In Aircraft Design, Systems and Operations Meeting. AIAA 1987-2949. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-2949
- Higgins, Ross, Antonio Jimenez-Garcia, George N. Barakos, and Nicholas Bown. 2019. “A Time-Marching Aeroelastic Method Applied to Propeller Flutter.” In AIAA Scitech 2019 Forum. AIAA 2019-1102. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1102
- Hill, T., and H. Schmitt. 1964. “Propulsion: The Key to an Efficient Vtol Transport.” In Transport Aircraft Design and Operations Meeting. AIAA 1964-620. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-620
- Hill, G., and M. Waters. 1974. “Conceptual Design of a Lift Fan Plus Lift/cruise Fighter Aircraft.” In 6th Aircraft Design,Flight Test and Operations Meeting. AIAA 1974-969. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1974-969
- Hill, W., Jr., and R. Jenkins. 1979. “Effect of Nozzle Spacing on Ground Interference Forces for a Two Jet V/STOL Aircraft.” In Aircraft Systems and Technology Meeting. AIAA 1979-1856. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1979-1856
- Hilton, D. A., H. H. Hubbard, and D. J. Maglieri. 1960. Noise Considerations in the Design and Operation of v STOL Aircraft. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19630004828
- Hindson, William S. 1987. Implementation and Flight-Test of a Multi-Mode Rotorcraft Flight-Control System for Single-Pilot Use in Poor Visibility. https://doi.org/10.4050/sm_avionics_1987-3119
- Hindson, William S., Gordon H. Hardy, George E. Tucker, and William A. Decker. 1993. “Piloting Considerations for Terminal Area Operations of Civil Tiltwing and Tiltrotor Aircraft.” In Piloting Vertical Flight Aircraft: A Conference on Flying Qualities and Human Factors. https://ntrs.nasa.gov/citations/19940008847
- Hinson, B. L. 1984. “Design and Experimental Evaluation of Propfan Inlets.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/841477
- Hirschkron, R., and R. H. Davis. 1982. “Advanced Turboprop Engines for Long Endurance Naval Patrol Aircraft.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/82-gt-217
- Hirschkron, Robert, R. H. Davis, D. N. Goldstein, J. F. Haynes, and J. W. Gauntner. 1984. Contingency Power Concepts for Helicopter Turboshaft Engine. https://doi.org/10.4050/vfs-f40-1194
- Hirschkron, R., and P. Hull. 1990. “Convertible Engine System for High Speed Rotorcraft.” In 26th Joint Propulsion Conference. AIAA 1990-2512. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-2512
- Hirschkron, R., and C. Russo. 1986. “Small Turboshaft/turboprop Engine Technology Study.” In 22nd Joint Propulsion Conference. AIAA 1986-1623. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-1623
- Hirsh, Norman B. 1965. Aircraft Design XV-9A Hot Cycle Research Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0621684
- Hirsh, J., John Liu, and David J. Paisley. 1990. “Tiltrotor Aerodynamic Blade Design by Numerical Optimization Method.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f46-1040
- Hirsh, Joel, Joseph Wilkerson, and Robert Narducci. 2007. “An Integrated Approach to Rotorcraft Conceptual Design.” In 45th AIAA Aerospace Sciences Meeting and Exhibit. AIAA 2007-1252. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2007-1252
- Hoad, Danny R., Susan L. Althoff, and Joe W. Elliott. 1988. “Rotor Inflow Variability with Advance Ratio.” In Annual Forum of the AHS. https://ntrs.nasa.gov/citations/19890031484
- Hoad, Danny R., David A. Conner, and Charles K. Rutledge. 1992. “Acoustic Flight Test Experience with the XV-15 Tiltrotor Aircraft with the Advanced Technology Blade (ATB).” In In: DGLR(AIAA Aeroacoustics Conference, 14th, Aachen, Germany, May 11-14, 1992, Proceedings. Vol. 1 (A93-19126 05-71). https://ntrs.nasa.gov/citations/19930035146
- Hoad, D. R., and G. L. Gentry Jr. 1975. Longitudinal Aerodynamics of a Low-Wing Lift-Fan Transport Including Hover Characteristics in and out of Ground Effect. NASA-TM-X-72670. NASA. https://ntrs.nasa.gov/citations/19750013176
- Hoad, D. R., and G. L. Gentry Jr. 1977. Longitudinal Aerodynamic Characteristics of a Low-Wing Lift-Fan Transport Including Hover Characteristics in and out of Ground Effect. NASA-TM-X-3420. NASA. https://ntrs.nasa.gov/citations/19770013085
- Hocko, Marián, and Jiri Polansky. 2014. “Transformation of an Aviation Turboshaft Engine into a Experimental Jet Engine for Laboratory Testing Unstable Radial Compressor Work.” In Volume 5: Education and Globalization. American Society of Mechanical Engineers. https://doi.org/10.1115/imece2014-37298
- Hoff, Stefan van ‘t, Leonardo Helicopters, Leonardo Helicopters, et al. 2025. “ATTILA Tiltrotor Whirl Flutter Code-to-Test Correlation.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0265
- Hoffman, M. 1971. “VTOL Aircraft Control Power Costs.” In 3rd Aircraft Design and Operations Meeting. AIAA 1971-768. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1971-768
- Hofmann, L. G., R. H. Hoh, W. F. Jewell, G. L. Teper, and P. D. Patel. 1978. Development of Automatic and Manual Flight Director Landing Systems for the XV-15 Tilt Rotor Aircraft in Helicopter Mode. NASA-CR-152140. NASA. https://ntrs.nasa.gov/citations/19780014128
- Hogg, G. W. 1979. Issues Regarding Army Turboshaft Engine Diagnostics and Condition Monitoring. https://doi.org/10.4050/sm_prop_1979-3294
- Hohenemser, Kurt H. 1955. “Remarks on the Unloaded Rotor Type of Convertiplane.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f11-002
- Hollimon, Charles, Dudley E. Smith, and David Ludolph. 2011. Method and Apparatus for in-Flight Blade Folding. https://patents.google.com/patent/CA2802389A1/en
- Holzhauser, C. A., and R. C. Innis. 1960. Operating Problems of v STOL Aircraft in Stol-Type Landing and Approach. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19630004826
- Holzhauser, C. A., S. A. Morello, R. C. Innis, and J. M. Patton. 1971. A Flight Evaluation of a VTOL Jet Transport under Visual and Simulated Instrument Conditions. NASA-TM-X-62083. NASA. https://ntrs.nasa.gov/citations/19710025733
- Holzhauser, C. A., S. A. Morello, R. C. Innis, and J. M. Patton Jr. 1972. A Flight Evaluation of VTOL Jet Transport under Visual and Simulated Instrument Conditions. NASA-TN-D-6754. NASA. https://ntrs.nasa.gov/citations/19720012362
- Honaker, Jim S. 1987. “Certification Issues for a Tilt-Rotor Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/871852
- Hong, Zhile, Guoyi He, Xinxin Ouyang, and Wentong Deng. 2025a. “Analysis of Aerodynamic Characteristics during Tilt Transition of Compound Tilt-Wing Aircraft.” International Journal of Aeronautical and Space Sciences 27 (2): 1130–44. https://doi.org/10.1007/s42405-025-01020-7
- Hong, Zhile, Guoyi He, Xinxin Ouyang, Wentong Deng, Kaixu Zhang, and Haitao Xu. 2025b. “The Study on the Aerodynamic Characteristics of the Transition Phase during the Take-Off of Compound Tilt-Wing Aircraft.” Advances in Aerospace Science and Technology 10 (01): 18–33. https://doi.org/10.4236/aast.2025.101002
- Hooi, Chin Gian, Francis D. Lagor, and Derek A. Paley. 2016. “Height Estimation and Control of Rotorcraft in Ground Effect Using Spatially Distributed Pressure Sensing.” Journal of the American Helicopter Society 61 (4): 1–14. https://doi.org/10.4050/jahs.61.042004
- Hoover, Christian B., Hao Kang, Jinwei Shen, and Andrew R. Kreshock. 2017a. “Proprotor Loads and Whirl-Flutter Stability of a Tiltrotor Wind Tunnel Model.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12055
- Hoover, Christian B., and Jinwei Shen. 2018b. “Parametric Study of Whirl Flutter Stability of the NASA Aircraft X-57.” In 2018 AIAA Aerospace Sciences Meeting. AIAA 2018-0276. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-0276
- Hoover, Christian B., and Jinwei Shen. 2018c. “Whirl Flutter Analysis of a Free-Flying Electric Driven Propeller Aircraft.” In 2018 Aviation Technology, Integration, and Operations Conference. AIAA 2018-3210. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-3210
- Hoover, Christian B., and Jinwei Shen. 2019a. “Fundamental Understanding of Propeller Whirl Flutter through Multibody Dynamics.” In AIAA Scitech 2019 Forum. AIAA 2019-1864. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1864
- Hoover, Christian B., Jinwei Shen, Andrew R. Kreshock, Bret Stanford, David J. Piatak, and Jennifer Heeg. 2017b. “Whirl Flutter Stability and Its Influence on the Design of the Distributed Electric Propeller Aircraft X-57.” In 17th AIAA Aviation Technology, Integration, and Operations Conference. AIAA 2017-3785. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-3785
- Horn, Joseph F., Tom Berger, Doug Miller, Grey Hagwood, Derek Bridges, and Christopher Hendrick. 2024. “Piloted Simulation Evaluation of Maneuver Optimization Control for a Tiltrotor Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1172
- Horn, Joseph F., and Wei Guo. 2008. Flight Control Design for Rotorcraft with Variable Rotor Speed. https://doi.org/10.4050/vfs-f64-120
- Horn, Joseph F., Adam T. Thorsen, and A. Conti. 2017. “Towards Handling Qualities Requirements for High-Speed Compound Rotorcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12066
- Horton, Jeshurun P., Jeffryes W. Chapman, and Thomas F. Tallerico. n.d. “Powertrain System Analysis for an Urban Air Mobility Tiltwing Concept Vehicle.” In The Vertical Flight Society’s 81st Annual Forum & Technology Display. https://ntrs.nasa.gov/citations/20250003869
- Hospodář, Pavel, and Robert Kulhánek. 2026. “Modeling and Flight Control Design of a Tilt-Wing Aircraft.” In The 15th EASN International Conference on “Innovation in Aviation & Space Towards Sustainability Today & Tomorrow”. MDPI. https://doi.org/10.3390/engproc2026133122
- Howard, Anna K. T. 1999. Understanding the Potential of Aeroelastic Couplings to Stabilize Ground and Air Resonance in a Soft-Inplane Tiltrotor. Pennsylvania State Univ. https://ntrs.nasa.gov/citations/19990064157
- Howard, Samuel A. 2007. Conceptual Design and Feasibility of Foil Bearings for Rotorcraft Engines: Hot Core Bearings. NASA Glenn Research Center. https://ntrs.nasa.gov/citations/20080005559
- Howard, Samuel A. 2012. Rotordynamic Feasibility of a Conceptual Variable-Speed Power Turbine Propulsion System for Large Civil Tilt-Rotor Applications. https://doi.org/10.4050/vfs-f68-000404
- Howard, Samuel A., Robert J. Bruckner, Christopher DellaCorte, and Kevin C. Radil. 2008. Preliminary Analysis for an Optimized Oil-Free Rotorcraft Engine Concept. NASA/TM-2008-215064. NASA. https://ntrs.nasa.gov/citations/20080015823
- Howard, Samuel A., Robert J. Bruckner, and Kevin C. Radil. 2010. Advancements toward Oil-Free Rotorcraft Propulsion. NASA/TM-2010-216094. NASA. https://ntrs.nasa.gov/citations/20100015409
- Howze, H. 1969. “Future Military Applications of VTOL Aircraft.” In 3rd Flight Test, Simulation, and Support Conference. AIAA 1969-326. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-326
- Hu, Xinyue, Huaizhi Jia, Jiangtao Huang, Ban Wang, and Zhenghong Gao. 2023. “Intelligent Lateral Control of a Canard Rotor/Wing Aircraft Based on Reinforcement Learning.” In Lecture Notes in Electrical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-99-0479-2_181
- Hu, Jiayue, Xin Zhao, and Zhang Weiguo. 2026. “Spatial All-Wing Configuration for the Conceptual Design of VTOL Solar-Powered Aircraft.” Preprint, . https://doi.org/10.2139/ssrn.6351259
- Huan, Li, Wu Xiaojun, Jia Hongyin, Zhou Guiyu, Cui Pengcheng, and Li Bin. 2021. “Calculation and Analysis of Interaction Flowfield over Tiltrotor Aircraft in Conversion Mode.” IOP Conference Series: Materials Science and Engineering 1081 (1): 012046. https://doi.org/10.1088/1757-899x/1081/1/012046
- Huang, Tristan, and Brian German. 2025. Exploring Transition Profiles for the RAVEN Multi-Tiltrotor Aircraft. https://doi.org/10.4050/sm_avtol_2025-5318
- Huang, Y. J., T. C. Kuo, and H. K. Way. 2003. “Robust Vertical Takeoff and Landing Aircraft Control via Integral Sliding Mode.” IEE Proceedings - Control Theory and Applications 150 (4): 383–88. https://doi.org/10.1049/ip-cta:20030593
- Huang, Jing, Ban Wang, Yangping Deng, and Youmin Zhang. 2023. “Nonlinear Modeling of Fixed-Wing Mode for a Ducted-Fan Tiltrotor UAV by DATCOM.” In Lecture Notes in Electrical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-19-6613-2_22
- Hubbard, Harvey H., and Leslie W. Lassiter. 1954. Oscillating Pressures near a Static Pusher Propeller at Tip Mach Numbers up to 1.20 with Special Reference to the Effects of the Presence of the Wing. NACA-TN-3202. NASA. https://ntrs.nasa.gov/citations/19930083968
- Hudson, S. M. 1977. “The Shaft Coupled Lift/Cruise Fan Propulsion System for Navy Multimission V/STOL Aircraft.” In ASME 1977 International Gas Turbine Conference and Products Show. American Society of Mechanical Engineers. https://doi.org/10.1115/77-gt-112
- Hudson, Eric. 2015. Reduction of Parasitic Leakage in Turboshaft Engines Using HALOTM Seals. https://doi.org/10.4050/sm_prop_2015-4044
- Husain, Syed, Matt Floros, Phuriwat Anusonti-Inthra, and Hao Kang. 2026. “Reinforcement Learning-Based Controller for Tiltrotor Aeroelastic Stability Augmentation (Presentation Only).” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0336
- Husseyin, S., and William G. Warmbrodt. 2016a. “Design Considerations for a Stopped-Rotor Cyclocopter for Venus Exploration.” In Summer 2016 Final Internship Report. https://ntrs.nasa.gov/citations/20160012563
- Husseyin, Sema, and William G. Warmbrodt. 2016b. “Stopped-Rotor Cyclocopter for Venus Exploration.” In Summer 2016 Final Internship Report and Poster. https://ntrs.nasa.gov/citations/20160012562
- Huston, Robert. 1989. “Implications of Current Composite Research on Conceptual Design Process for Rotorcraft.” In Proceedings of the The Rotary Wing Aircraft Conceptual Design Process - Atlanta, Georgia, 1989. The Vertical Flight Society. https://doi.org/10.4050/sm_rotary_1989-3131
- Huston, Robert, Robert Golub, and James Yu. 1989. “Noise Considerations for Tiltrotor.” In 25th Joint Propulsion Conference. AIAA 1989-2359. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2359
- Huston, R. J., J. F. Ward, and M. M. Winston. 1963. Wing and Flap Loads Obtained from a Wind-Tunnel Investigation of Large-Scale v STOL Model. NASA-TN-D-1634. NASA. https://ntrs.nasa.gov/citations/19630005174
- Hutson, Dean. 2004. Estimating Lcf Damage Rate in Fielded T700 Engines. https://doi.org/10.4050/vfs-f60-000095
- Hwang, D. P. 1983. “Analytical Study of Blowing Boundary Layer Control for Subsonic V/STOL Inlets.” In Computation of internal flows; Methods and applications. https://ntrs.nasa.gov/citations/19850029495
- Hwang, D. P. 1984. “Analytical Study of Blowing Boundary-Layer Control for Subsonic V/STOL Inlets.” In Ann. Energy-Sources Technol. Conf. and Exhibition. https://ntrs.nasa.gov/citations/19840008073
- Hwang, D. P., and J. H. Diedrich. 1981. “A Summary of V/STOL Inlet Analysis Methods.” In V/STOL Conference. https://ntrs.nasa.gov/citations/19820033367
- Hwang, Ui-Jin, Jae-Sang Park, and Myeong-Kyu Lee. 2024. “Comparison of Tiltrotor Whirl Flutter Analyses with Gimballed and Hingeless Hub Models.” International Journal of Aeronautical and Space Sciences 25 (4): 1310–18. https://doi.org/10.1007/s42405-024-00728-2
- Ibacoglu, Hasan, Abdullah Coskun, and Tolga Kayabasi. 2022. “Rotorcraft Conceptual Design Methodology by Using Fully Parametric CAD Model with Embedded Empirical Formulations.” In Proceedings of the Vertical Flight Society 78th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0078-2022-17486
- Ibrahim, Sargon, and Cees Bil. 2013. “Conceptual Design and Analysis of an Unmanned Cargo Transport Tiltrotor Aircraft.” In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. AIAA 2013-945. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2013-945
- Ibrahim, Noureldein A., Mohamed Y. Zakaria, and Ashraf M. Kamal. 2026. “Multi-Mode Wind Tunnel Testing of Tiltrotor UAV Propellers with Integration for Propulsion and Flight Dynamics Modeling.” Unmanned Systems: 1–29. https://doi.org/10.1142/s2301385028500422
- Içke, Ramiz Ö., Oktay Baysal, Leonard V. Lopes, and Boris Diskin. 2021. “Optimizing Proprotor Blades Using Coupled Aeroacoustic and Aerodynamic Sensitivities.” In AIAA Aviation 2021 Forum. AIAA 2021-3037. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-3037
- Ignatkin, Yuri Mikhailovich, Pavel Vyacheslavovich Makeev, Alexander Ivanovich Shomov, and Valery Andreevich Ivchin. 2021. “Numerical Study of the Main Rotor Wake Structures and Induced Velocity Fields at the Tail Rotor Location When Flying near the Ground.” International Review of Aerospace Engineering (IREASE) 14 (4): 181. https://doi.org/10.15866/irease.v14i4.19744
- Immenschuh, William. 1990. “Ryan X-13 Experimental Aircraft: Lessons Learned.” In Aircraft Design, Systems and Operations Conference. AIAA 1990-3236. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3236
- “Immersion and Invariance Adaptive Fault-Tolerant Attitude Control for a Coaxial Tilt-Rotor eVTOL Aircraft.” 2026. Journal of Artificial Intelligence & Control Systems. https://doi.org/10.66967/jaics.2026.v2i104
- Imray, Malcolm. n.d. “Preliminary Testing of a Twisted Delta Propeller for Transonic Cruise Speed.” PhD diss., Carleton University. https://doi.org/10.22215/etd/1986-01204
- “INAV-Based Adaptive Transition Control for QuadPlane VTOL UAVs in Urban Wind Gust Environments.” 2025. International Journal of Electrical and Electronics Engineering 12 (8). https://doi.org/10.14445/23488379/ijeee-v12i8p117
- Ingraham, Daniel. 2023. “Towards Gradient-Based Proprotor Design with VSPAERO.” In Fall NASA Acoustics Technical Working Group. https://ntrs.nasa.gov/citations/20230014198
- Ingraham, Daniel, and David Kinney. 2024. “Towards Low-Noise Design of a Proprotor with the Vortex Lattice Method and Gradient-Based Optimization.” In AIAA SCITECH 2024 Forum. AIAA 2024-0157. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-0157
- “Introduction to the Flight Simulation of Helicopters and Tiltrotors.” 2007. In Introduction to Helicopter and Tiltrotor Flight Simulation. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/5.9781600862083.0001.0016
- “Introduction to the Flight Simulation of Helicopters and Tiltrotors.” 2018. In Introduction to Helicopter and Tiltrotor Flight Simulation, Second Edition. American Institute of Aeronautics and Astronautics, Inc. https://doi.org/10.2514/5.9781624105135.0001.0018
- Irvin, E. M., and R. H. Swan. 1956. Performance and Weight Estimates for Six VTOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0147927
- Isaac, Mark L. 2008. XV-3 Convertiplane – a Study in Innovation. https://doi.org/10.4050/vfs-f64-000265
- Ivanco, Thomas G., Hao Kang, Andrew R. Kreshock, Robert P. Thornburgh, and Brett Newman. 2022. “Generalized Predictive Control for Active Stability Augmentation and Vibration Reduction on an Aeroelastic Tiltrotor Model.” In AIAA SCITECH 2022 Forum. AIAA 2022-0570. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-0570
- Ivanco, Thomas G., Andrew R. Kreshock, Robert P. Thornburgh, Matthew L. Wilbur, and Brett A. Newman. n.d. “Experimental Testing of Advanced Generalized Predictive Control for Stability Augmentation and Vibration Reduction of Tiltrotor Aircraft.” In Vertical Flight Society’s 79th Annual Forum & Technology Display. https://ntrs.nasa.gov/citations/20230004296
- Ivanco, Thomas G., Martin K. Sekula, Robert Thornburgh, and Andrew R. Kreshock. 2025. “Use of Generalized Predictive Control for Flutter Suppression of the Tiltrotor Aeroelastic System Testbed (TRAST).” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0350
- Ivans, Steven Ray, Brent Chadwick Ross, Danielle Lynn Moore, Berlin Bernard Benfield, and Jason Paul Hurst. 2021. Tail Sitter Stop-Fold Aircraft. https://patents.google.com/patent/US20210253239A1/en
- Iwata, Takanori, and Stephen Rock. 1993. “Benefits of Variable Rotor Speed in Integrated Helicopter/engine Control.” In Guidance, Navigation and Control Conference. AIAA 1993-3851. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-3851
- Jackson, E., and T. Coyle. 1983. “Assurance of the X-29 Advanced Technology Demonstrator Flight Control Software.” In 2nd Flight Testing Conference. AIAA 1983-2724. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-2724
- Jacob Boby, Ritu, and E. Raj Kumar. 2016. “Design and Analysis of Gear System for Turboshaft Aero Engine Reduction Gearbox.” Indian Journal of Science and Technology 9 (34). https://doi.org/10.17485/ijst/2016/v9i34/100994
- Jacobellis, George, Farhan S. Gandhi, Thomas Rice, and Michael Amitay. 2018. “Computational and Experimental Investigation of Camber Morphing Airfoils for Reverse Flow Drag Reduction on High-Speed Rotorcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12686
- Jacobellis, George, Farhan Gandhi, Thomas T. Rice, and Michael Amitay. 2019. “Computational and Experimental Investigation of Camber-Morphing Airfoils for Reverse Flow Drag Reduction on High-Speed Rotorcraft.” Journal of the American Helicopter Society 65 (1): 1–14. https://doi.org/10.4050/jahs.65.012001
- Jacobson, D. 1964. “An Evaluation of Lift Engines in Tactical Vtol Aircraft.” In Military Aircraft Systems and Technology Meeting. AIAA 1964-767. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-767
- Jain, Rohit. 2015. “Hover Predictions for the S-76 Rotor with Tip Shape Variation Using CREATE-AV Helios.” In 53rd AIAA Aerospace Sciences Meeting. AIAA 2015-1244. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1244
- Jain, Rohit. 2016. “A Comparison of CFD Hover Predictions for the Sikorsky S-76 Rotor.” In 54th AIAA Aerospace Sciences Meeting. AIAA 2016-0032. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-0032
- Jain, Rohit. 2017. “CFD Performance and Turbulence Transition Predictions on an Installed Model-Scale Rotor in Hover.” In 55th AIAA Aerospace Sciences Meeting. AIAA 2017-1871. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-1871
- Jain, Rohit. 2018. “Effect of Facility Walls and Blade Aeroelasticity on PSP Rotor Hover Performance Predictions.” In 2018 AIAA Aerospace Sciences Meeting. AIAA 2018-0305. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-0305
- Jain, Rohit. 2024. “CFD-CSD Pre-Test Hover Predictions Validation for the HVAB Rotor.” In AIAA SCITECH 2024 Forum. AIAA 2024-0893. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-0893
- Jain, Rohit K., and Mark A. Potsdam. 2014. “Hover Predictions on the Sikorsky S-76 Rotor Using Helios.” In 52nd Aerospace Sciences Meeting. AIAA 2014-0207. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2014-0207
- James, R., Steven Rodriquez, and Lawrence Pilkington. 2017. “Reliability Analysis of a Rotorcraft Transmission Bolted Connection.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12155
- Jarvis, M. Simon, Warren J. Ostergren, and Bert Smith. 1993. “The Applicability of Electrically Driven Accessories for Turboshaft Engines.” In Volume 3B: General. American Society of Mechanical Engineers. https://doi.org/10.1115/93-gt-313
- Jasas, G., and Teledyne Cae J. C. Fourny. 1983. “Convertible Fan/shaft Engine Demonstration.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f39-034
- Jasion, Gregory T., and John S. Shrimpton. 2012. “Prediction of Brownout Inception beneath a Full-Scale Helicopter Downwash.” Journal of the American Helicopter Society 57 (4): 1–13. https://doi.org/10.4050/jahs.57.042006
- Jatsun, S., O. Emelyanova, and A. S. Martinez Leon. 2020b. “Design of an Experimental Test Bench for a UAV Type Convertiplane.” IOP Conference Series: Materials Science and Engineering 714 (1): 012009. https://doi.org/10.1088/1757-899x/714/1/012009
- Jehangir, Rustom. 2014. “Development of an Attitude Control System for a Large Scale Multicopter VTOL Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0070-2014-9423
- Jenkins, B. Z., and A. S. Marks. 1975. Rotor Downwash Velocities about the UH-1M Helicopter: Flight Test Measurements and Theoretical Calculations. Defense Technical Information Center. https://doi.org/10.21236/ada008965
- Jensen, James C., Andrew M. Chuen, and William M. Chan. 2025. “Pre-Test CFD and Analyses for the Tiltwing Test Rig Experiment.” In AIAA AVIATION Forum. https://ntrs.nasa.gov/citations/20250006217
- Jeon, Kwon-Su. 2008. “Rotor Performance Optimization of the Canard Rotor Wing Aircraft.” Journal of the Korean Society for Aeronautical & Space Sciences 36 (2): 105–14. https://doi.org/10.5139/jksas.2008.36.2.105
- Jeong, Hoseok, and Sanghyuk Park. 2025. “Flight Control Laws of VTOL Aircraft with Propellers Fixed at an Inclined Angle.” International Journal of Aeronautical and Space Sciences 27 (3): 2318–33. https://doi.org/10.1007/s42405-025-01066-7
- Jeong, Taemin, Michael Radotich, Wayne Johnson, and Christopher Silva. 2024. “Design of a Six-Tiltrotor Concept Vehicle for Urban Air Mobility.” In AIAA Aviation Forum and Ascend 2024. AIAA 2024-4427. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-4427
- Jepson, W. D., and Raymond G. Carlson. 1968. “Wind Tunnel Investigations of a High Speed Stowed Rotor Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/680280
- Jeracki, R. J., and G. A. Mitchell. 1981. Low and High Speed Propellers for General Aviation: Performance Potential and Recent Wind Tunnel Test Results. NASA-TM-81745. NASA. https://ntrs.nasa.gov/citations/19810012499
- Jerominek, Mateusz. 2026. “Propfan – Kompromis Między Silnikiem Turbośmigłowym a Turbowentylatorowym.” Technika Lotnicza i Astronautyczna, no. 1–2. https://doi.org/10.35784/tlia.10132
- Ji, Min, Ning Wang, and Chong Zhao. 2016. “The Simulation and Analysis of the Tilt Rotor Aircraft Model Transition.” In Advances in Intelligent Systems Research. Atlantis Press. https://doi.org/10.2991/mcei-16.2016.46
- Jia, Linyuan, Zi’ao Chen, Cheng Ren, Keyu Yang, and Yuchun Chen. 2025b. “Overall Performance Study of Turboshaft-Turbofan Variable Cycle Engine.” In Springer Aerospace Technology. Springer Nature Singapore. https://doi.org/10.1007/978-981-96-3240-4_24
- Jia, Linyuan, Zhuocheng Li, Yunfei Bai, Jichang Wu, Le Gao, and Ziao Chen. 2025a. “Design of the Turboshaft Engine Acceleration and Deceleration Control Schedules Based on Direct Simulation Method.” In Springer Aerospace Technology. Springer Nature Singapore. https://doi.org/10.1007/978-981-96-3240-4_29
- Jia, Jike, Xiaomei Ye, Guoyi He, Qingjin Huang, and Zhile Hong. 2024. “Analysis and Research on Aerodynamic Characteristics of Quad Tilt Rotor Aircraft.” Advances in Aerospace Science and Technology 09 (01): 28–39. https://doi.org/10.4236/aast.2024.91003
- Jiang, Yun Peng, and Bo Zhang. 2018. “Numerical Assessment of a High Disk Loading Annular Lift Fan Aircraft.” Journal of the American Helicopter Society. https://doi.org/10.4050/jahs.63.042005-1
- Jiang, Yun, and Bo Zhang. 2021. “Transitional Strategy for Annular Lift Fan Aircraft to Lower the Momentum Drag and Pitching Moment.” Journal of Aerospace Engineering 34 (2): 04021002. https://doi.org/10.1061/(asce)as.1943-5525.0001242
- Jiao, Ling Rui, Di Peng, Xin Wen, Yingzheng Liu, and James W. Gregory. 2018. “Experimental Study of the Interaction between Rotor Wake and a Cylinder in Hover.” In 2018 Applied Aerodynamics Conference. AIAA 2018-4214. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-4214
- Jimenez Garcia, Antonio, and George N. Barakos. 2015. “Hover Performance Predictions for the S-76 Main Rotor Blade.” In 53rd AIAA Aerospace Sciences Meeting. AIAA 2015-1712. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1712
- Jimenez-Garcia, Antonio, and George N. Barakos. 2016. “CFD Simulations of the ERICA Tiltrotor Using HMB2.” In 54th AIAA Aerospace Sciences Meeting. AIAA 2016-0329. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-0329
- Jimenez-Garcia, Antonio, and George N. Barakos. 2017. “Prediction of Helicopter Rotor Hover Performance Using High Fidelity CFd Methods.” In 35th AIAA Applied Aerodynamics Conference. AIAA 2017-3053. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-3053
- Jimenez-Garcia, A., M. Biava, G. N. Barakos, K. D. Baverstock, S. Gates, and P. Mullen. 2017. “Tiltrotor CFD Part II: Aerodynamic Optimisation of Tiltrotor Blades.” Aeronautical Journal 121 (1239): 611–36. https://doi.org/10.1017/aer.2017.21
- Joglekar, Anil, Dave Baratti, Devol Brett, Jim Doherty, and Scott Feil. 2003. Interim Report on Interagency National Personnel Recovery Architecture. Defense Technical Information Center. https://doi.org/10.21236/ada420789
- Joglekar, M., Charles Dabundo, and J. White. 1991. “Flying Qualities Evaluation of the V22 Tiltrotor.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f47-1008
- Johansen, K. M., and W. H. Duncan. 1970. Reverse-Flow Turboshaft Engine Study. Defense Technical Information Center. https://doi.org/10.21236/ad0877672
- Johns, D. J. 1972. “Literature Review: WHIRL- FLUTTER ANALYSIS OF PROPELLER-NACELLE-PYLON SYSTEM ON LARGE SURFACE-EFFECT VEHICLES Liu, Y. N. Shock Vib. Bull. 42 (2) (Jan. 1972) Refer to Abstract No. 72-291.” Shock and Vibration Digest 4 (9): 73–73. https://doi.org/10.1177/058310247200400917
- Johnson, W. 1974a. Analytical Model for Tilting Proprotor Aircraft Dynamics, Including Blade Torsion and Coupled Bending Modes, and Conversion Mode Operation. NASA-TM-X-62369. NASA. https://ntrs.nasa.gov/citations/19740023385
- Johnson, W. 1974b. Dynamics of Tilting Proprotor Aircraft in Cruise Flight. NASA-TN-D-7677. NASA. https://ntrs.nasa.gov/citations/19740019387
- Johnson, W. 1974c. “Theory and Comparison with Tests of Two Full-Scale Proprotors.” In Its Rotorcraft Dyn.. https://ntrs.nasa.gov/citations/19740026392
- Johnson, W. 1975a. Analytical Modeling Requirements for Tilting Proprotor Aircraft Dynamics. NASA-TN-D-8013. NASA. https://ntrs.nasa.gov/citations/19750019350
- Johnson, W. 1975b. The Influence of Engine/transmission/governor on Tilting Proprotor Aircraft Dynamics. NASA-TM-X-62455. NASA. https://ntrs.nasa.gov/citations/19750019978
- Johnson, W. 1975c. Optimal Control Alleviation of Tilting Proprotor Gust Response. NASA-TM-X-62494. NASA. https://ntrs.nasa.gov/citations/19760003907
- Johnson, W. 1976. Predicted Dynamic Characteristics of the XV-15 Tilting Proprotor Aircraft in Flight and in the 40- by 80-Ft. Wind Tunnel. NASA-TM-X-73158. NASA. https://ntrs.nasa.gov/citations/19760023060
- Johnson, W. 1977a. The Influence of Pitch-Lag Coupling on the Predicted Aeroelastic Stability of the XV-15 Tilting Proprotor Aircraft. NASA-TM-X-73213. NASA. https://ntrs.nasa.gov/citations/19770013045
- Johnson, W. 1980. Comparison of Calculated and Measured Blade Loads on a Full-Scale Tilting Proprotor in a Wind Tunnel. NASA-TM-81228. NASA. https://ntrs.nasa.gov/citations/19800022880
- Johnson, V. S. 1983a. “Comparison of Advanced Turboprop and Turbofan Airplanes.” In AIAA Appl. Aerodyn. Conf.. https://ntrs.nasa.gov/citations/19830027751
- Johnson, V. 1983b. “Parametric Study of Factors Affecting the Fuel Efficiency of Advanced Turboprop Airplanes.” In Applied Aerodynamics Conference. AIAA 1983-1823. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-1823
- Johnson, Wayne. 2001a. “Calculation of the Aerodynamic Behavior of the Tilt Rotor Aeroacoustic Model (TRAM) in the DNW.” In American Helicopter Society 57th Annual Forum. https://ntrs.nasa.gov/citations/20080047463
- Johnson, Wayne. 2001b. Influence of Wake Models on Calculated Tiltrotor Aerodynamics. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20030071236
- Johnson, Wayne. 2003. Airloads and Wake Geometry Calculations for an Isolated Tiltrotor Model in a Wind Tunnel. Army Aviation Systems Command. https://ntrs.nasa.gov/citations/20030063077
- Johnson, Wayne R. 2009. NDARC NASA Design and Analysis of Rotorcraft. NASA/TP-2009-215402. NASA. https://ntrs.nasa.gov/citations/20100021405
- Johnson, Wayne. 2010a. “NDARC-NASA Design and Analysis of Rotorcraft Theoretical Basis and Architecture.” In AHS Aeromechanics Specialists Conference 2010. https://ntrs.nasa.gov/citations/20100021986
- Johnson, Wayne. 2010b. “NDARC: NASA Design and Analysis of Rotorcraft Validation and Demonstration.” In American Helicopter Society Aeromechanics Specialists’’ Conference. https://ntrs.nasa.gov/citations/20110002948
- Johnson, Wayne. 2014. “Propulsion System Models for Rotorcraft Conceptual Design.” In Decennial AHS Aeromechanics Specialists’’ Conference. https://ntrs.nasa.gov/citations/20140013079
- Johnson, Wayne. 2015. NDARC: NASA Design and Analysis of Rotorcraft. NASA/TP-2015-218751. NASA. https://ntrs.nasa.gov/citations/20150021267
- Johnson, Wayne. 2016a. NDARC NASA Design and Analysis of Rotorcraft Theory Appendix 1. NASA/TP-2015-218751. NASA. https://ntrs.nasa.gov/citations/20160012474
- Johnson, Wayne. 2016b. NDARC NASA Design and Analysis of Rotorcraft: Input, Appendix 2. NASA/TP-2015-218751. NASA. https://ntrs.nasa.gov/citations/20160012473
- Johnson, Wayne. 2016c. NDARC NASA Design and Analysis of Rotorcraft: Input, Appendix 4. NASA/TP-2015-218751. NASA. https://ntrs.nasa.gov/citations/20170000454
- Johnson, Wayne. 2016d. NDARC: NASA Design and Analysis of Rotorcraft: Theory: Appendix 3. NASA/TP-2015-218751. NASA. https://ntrs.nasa.gov/citations/20170011635
- Johnson, Wayne. 2017a. NDARC NASA Design and Analysis of Rotorcraft: Input: Appendix 6. NASA/TP-2015-218751. NASA. https://ntrs.nasa.gov/citations/20180001562
- Johnson, Wayne. 2017b. NDARC NASA Design and Analysis of Rotorcraft: Theory: Appendix 5. NASA/TP-2015-218751. NASA. https://ntrs.nasa.gov/citations/20170011656
- Johnson, Wayne. 2018a. NDARC NASA Design and Analysis of Rotorcraft: Input, Appendix 8. NASA/TP-2015-218751. NASA. https://ntrs.nasa.gov/citations/20180003212
- Johnson, Wayne. 2018b. NDARC NASA Design and Analysis of Rotorcraft: Theory, Appendix 7. NASA/TP-2015-218751. NASA. https://ntrs.nasa.gov/citations/20180003211
- Johnson, Wayne. 2019. NDARC NASA Design and Analysis of Rotorcraft: Input, Appendix 10. NASA/TP–2015-218751. NASA. https://ntrs.nasa.gov/citations/20190025456
- Johnson, Wayne. 2022a. NDARC: NASA Design and Analysis of Rotorcraft: Input and Data Structures: Vol 2. Ames Research Center. https://ntrs.nasa.gov/citations/20220000356
- Johnson, Wayne. 2022b. NDARC: NASA Design and Analysis of Rotorcraft: Input: Vol 3. Ames Research Center. https://ntrs.nasa.gov/citations/20220000357
- Johnson, Wayne. 2022c. NDARC: NASA Design and Analysis of Rotorcraft: Theory: Vol 1. Ames Research Center. https://ntrs.nasa.gov/citations/20220000355
- Johnson, Wayne. 2023a. NDARC: NASA Design and Analysis of Rotorcraft: Input and Data Structures: Appendix 2. NASA/TP–2022-0000355/Appendix 2. NASA. https://ntrs.nasa.gov/citations/20230003602
- Johnson, Wayne. 2023b. NDARC: NASA Design and Analysis of Rotorcraft: Input: Appendix 3. Ames Research Center. https://ntrs.nasa.gov/citations/20230003603
- Johnson, Wayne. 2023c. NDARC: NASA Design and Analysis of Rotorcraft: Theory: Appendix A. Ames Research Center. https://ntrs.nasa.gov/citations/20230003601
- Johnson, Wayne. 2024a. NDARC NASA Design and Analysis of Rotorcraft: Input and Data Structures: Appendix E. NASA/TP–20220000355/APPX-E. NASA. https://ntrs.nasa.gov/citations/20250003335
- Johnson, Wayne. 2024b. NDARC NASA Design and Analysis of Rotorcraft: Input: Appendix F. NASA/TP–20220000355/APPX-F. NASA. https://ntrs.nasa.gov/citations/20250003338
- Johnson, Wayne. 2024c. NDARC NASA Design and Analysis of Rotorcraft: Theory: Appendix D. NASA/TP–20220000355/APPX-D. NASA. https://ntrs.nasa.gov/citations/20250003337
- Johnson, Wayne. 2025a. NDARC: NASA Design and Analysis of Rotorcraft Input. National Aeronautics and Space Administration. https://doi.org/10.64631/wyyr1061
- Johnson, Wayne. 2025b. NDARC: NASA Design and Analysis of Rotorcraft, Input and Data Structures. National Aeronautics and Space Administration. https://doi.org/10.64631/ricc6910
- Johnson, Wayne. 2025c. NDARC: NASA Design and Analysis of Rotorcraft: Theory. National Aeronautics and Space Administration. https://doi.org/10.64631/mhfc8399
- Johnson, John N., Gary L. Bender, Randy D. McClellan, John R. Burden, and Morrie E. Larsen. 1972. Attack Helicopter Evaluation AH-56A Cheyenne Compound Helicopter. Defense Technical Information Center. https://doi.org/10.21236/ad0771914
- Johnson, Wayne, Joshua F. Elmore, Ernest B. Keen, Andrew T. Gallaher, and Gerardo F. Nunez. 2016. “Coaxial Compound Helicopter for Confined Urban Operations.” In AHS Specialists Technical Conference on Aeromechanics Design for Vertical Lift. https://ntrs.nasa.gov/citations/20160012252
- Johnson, Wayne, Benton H. Lau, and Jeffrey V. Bowles. 1987. “Calculated Performance, Stability, and Maneuverability of High Speed Tilting Proprotor Aircraft.” Vertica 11 (1-2,). https://ntrs.nasa.gov/citations/19870047589
- Johnson, Edward T., and Howard Lindsay. 1990. “Advanced Technology Programs for Small Turboshaft Engines: Past, Present, Future.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/90-gt-267
- Johnson, C. T., and R. A. Maddali. 2008. Aeroelastic Stability Flight Testing of the BA609 Tiltrotor. https://doi.org/10.4050/vfs-f64-000281
- Johnson, Wayne, Christopher Silva, and Jeffrey Sinsay. 2014. NDARC NASA Design and Analysis of Rotorcraft- User Training. ARC-E-DAA-TN14047. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20180008700
- Johnson, Jesse, Virginia Stouffer, Dou Long, Joana Gribko, and Robert Yackovetsky. 2001. Evaluation of the National Throughput Benefits of the Civil Tilt Rotor. NASA/CR-2001-211055. NASA. https://ntrs.nasa.gov/citations/20010097959
- Johnson, Wayne, Gloria Yamauchi, Michael Derby, and Alan Wadcock. 2003. “Wind Tunnel Measurements and Calculations of Aerodynamic Interactions between Tiltrotor Aircraft.” In 41st Aerospace Sciences Meeting and Exhibit. AIAA 2003-47. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-47
- Johnson, Wayne, and Hyeonsoo Yeo. 2007. “Performance and Design Investigation of Heavy Lift Tiltrotor with Aerodynamic Interference Effects.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f63-000252
- Johnson, Wayne, Hyeonsoo Yeo, and C. W. Acree Jr. 2007. “Performance of Advanced Heavy-Lift, High-Speed Rotorcraft Configurations.” In AHS International Forum on Rotorcraft Multidisciplinary Technology. https://ntrs.nasa.gov/citations/20080047713
- Johnston, Robert, and Sanford Fleeter. 1995. “High Speed Rotor Wake, Vortical and Potential Forcing Functions.” In 31st Joint Propulsion Conference and Exhibit. AIAA 1995-2482. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1995-2482
- Johnston, Ford, and Carl Friend. 1965. “Effect of Size on VTOL Aircraft Hover and Low Speed Handling Qualities.” In Proceedings of the 1st National Symposium on V/STOL Aircraft, Subsystem Design and Testing and Operation - Ohio 1965. The Vertical Flight Society. https://doi.org/10.4050/sm_vstol_1965-2533
- Jones, W. L. 1971b. Vibration in V/STOL Aircraft. NASA-TM-X-66956. NASA. https://ntrs.nasa.gov/citations/19710010881
- Jones, P. L., R. F. Kraus, and Mark S. Darlow. 1988. Demonstration of a Supercritical Composite Helicopter Power Transmission Shaft. https://doi.org/10.4050/sm-struct-1988-2264
- Joppa, R. G. 1966. Experimental and Theoretical Investigation of Wind Tunnel Geometry, Emphasizing Factors Pertinent to V/STOL Vehicles Testing Progress Report No. 3, Sep. 16, 1965: Mar. 15, 1966. NASA-CR-75822. NASA. https://ntrs.nasa.gov/citations/19660020004
- Joppa, R. G., and P. C. Parikh. 1984. Numerical Simulation of Controlled Flow Tunnel for V/STOL Testing. AIAA PAPER 84-2152. Washington, University. https://ntrs.nasa.gov/citations/19840058543
- Joppa, R. G., and S. Shindo. 1965. An Experimental Investigation of Feasibility of a V/STOL Test Section in UWAL 8 x 12 Wind Tunnel by Using a 1/8 Scale Model of the Tunnel. NASA-CR-69663. NASA. https://ntrs.nasa.gov/citations/19660006737
- Jordon, D. E., W. Patterson, and D. R. Sandlin. 1985. An Experimental and Analytical Method for Approximate Determination of the Tilt Rotor Research Aircraft Rotor/wing Download. NASA-CR-176970. NASA. https://ntrs.nasa.gov/citations/19860020297
- Josephs, L., III. 1964. “Survey of Significant Technical Problems Unique to V/stol Encountered in the Development of the Xc-142a.” In Military Aircraft Systems and Technology Meeting. AIAA 1964-775. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-775
- Judas, Michael, and Nikolaos Deligiannidis. 2013. “Tilt Wing Demonstrator Concept Design.” In 2013 International Powered Lift Conference. AIAA 2013-4326. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2013-4326
- Juhasz, Ondrej, Roberto Celi, Christina Ivler, Mark B. Tischler, and Tom Berger. 2012. Flight Dynamic Simulation Modeling of Large Flexible Tiltrotor Aircraft. https://doi.org/10.4050/vfs-f68-000293
- Juhasz, Ondrej, Roberto Celi, and Mark B. Tischler. 2021. “Flight Dynamics Simulation Modeling of a Large Flexible Tiltrotor Aircraft.” Journal of the American Helicopter Society 67 (2): 1–16. https://doi.org/10.4050/jahs.67.022003
- Jumper, Stephen J., Devon Prichard, and Robert A. Golub. 1991. “Tiltrotor Ground Noise Reduction from Rotor Parametric Changes as Predicted by ROTONET.” In In: AHS and Royal Aeronautical Society, Technical Specialists’ Meeting on Rotorcraft Acoustics(Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings (A93-29401 10-71). https://ntrs.nasa.gov/citations/19930045418
- Jun, Dogyu, Alessandro Cocco, Umberto Saetti, and Ondrej Juhasz. 2026. “Flight Dynamics of a Coaxial Compound Helicopter with Rotor-on-Rotor Interactional Aerodynamics.” Journal of the American Helicopter Society 71 (1): 1–18. https://doi.org/10.4050/jahs.71.012008
- Jung, Yong Su, Bumseok Lee, and James D. Baeder. 2024. “Prediction of HVAB Hovering Rotor Performance and Ground Effect Using Mercury Framework.” In AIAA SCITECH 2024 Forum. AIAA 2024-0895. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-0895
- Jusko, Tim, Michael W. Jones, and Benedikt Grebing. 2022. “Flight Test of Scaled MTEs for VTOL Certification Using an Ultralight Coaxial Helicopter.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0078-2022-0016
- Jussaume, Annette. 2011. Perspective on Rotorcraft Propulsion Development. https://doi.org/10.4050/sm_prop_2011-3843
- Kalabuhov, D. S., V. A. Grigoriev, A. O. Zagrebelnyi, and D. S. Diligensky. 2019. “Updating the Helicopter Gas Turbine Engine Mass Model for the Defining of the Turboshaft Engine Optimal Operating Cycle Parameters.” In Volume 1: Aircraft Engine; Fans and Blowers; Marine; Honors and Awards. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2019-90800
- Kalemaris, S. 1983. “V/STOL for Sea Control.” In Aircraft Design, Systems and Technology Meeting. AIAA 1983-2436. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-2436
- Kalemaris, S., and R. Cea. 1977. “Effects of Technology Level on V/STOL Aircraft.” In Aircraft Systems and Technology Meeting. AIAA 1977-1238. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1977-1238
- Kalra, Tarandeep S., Mathieu Amiraux, Vengalattore T. Nagaraj, James Baeder, and Inderjit Chopra. 2012. A Comparative Study of Different Weight Formulations Affecting Preliminary Sizing of Rotorcraft. https://doi.org/10.4050/vfs-f68-000255
- Kalra, Tarandeep, Vinod K. Lakshminarayan, and James Baeder. 2013. “Effect of Tip Geometry on a Hovering Rotor in Ground Effect: A Computational Study.” In 31st AIAA Applied Aerodynamics Conference. AIAA 2013-2542. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2013-2542
- Kalra, Tarandeep, Vinod Lakshminarayan, James Baeder, and Sebastian Thomas. 2011. “Methodological Improvements for Computational Study of Hovering Micro-Rotor in Ground Effect.” In 20th AIAA Computational Fluid Dynamics Conference. AIAA 2011-3552. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2011-3552
- Kang, Young Seok, Yong Min Jun, and Jae Hwan Kim. 2018. “Main Components Design of a Small Turboshaft Engine.” KSFM Journal of Fluid Machinery 21 (2): 19–26. https://doi.org/10.5293/kfma.2018.21.2.019
- Kang, Hee, and Oh Kwon. 2000. “Numerical Prediction of Rotor Hover Performances Using Unstructured Adaptive Meshes.” In 38th Aerospace Sciences Meeting and Exhibit. AIAA 2000-258. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2000-258
- Kang, D. H., N. E. Park, J. D. Cho, and S. H. Park. 2025b. “Study on Proprotor Airfoil Optimization for Improving Aerodynamic Performance of Tiltrotor Aircraft, Part ⅱ: Evaluation of Proprotor Performance.” Journal of computational fluids engineering 30 (2): 56–67. https://doi.org/10.6112/kscfe.2025.30.2.056
- Kang, Hao, Jinwei Shen, and Andrew R. Kreshock. 2016. “Parametric Study of Tiltrotor Whirl Flutter Using Two Rotorcraft Comprehensive Analyses.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0072-2016-11445
- Kang, Hao, Rajneesh Singh, and Jinwei Shen. 2019. “Soft-Inplane Tiltrotor Aeromechanics Analysis Using RCAS.” In AIAA Scitech 2019 Forum. AIAA 2019-2135. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-2135
- Kang, Namuk, James Ferris Whidborne, and Linghai Lu. 2024. “Minimum Energy Performance for Autonomous Control of Tiltrotor eVTOL Operations.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1093
- Kang, Namuk, James Whidborne, Linghai Lu, and Julien Enconniere. 2023b. “Scheduled Flight Control System of Tilt-Rotor VTOL PAV.” In AIAA SCITECH 2023 Forum. AIAA 2023-1530. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1530
- Kang, Hao, Hyeonsoo Yeo, Jinwei Shen, Andrew Kreshock, Robert Thornburgh, and Matthew Floros. 2023a. “Correlation of Tiltrotor Aeroelastic Stability Wind Tunnel Test.” In Proceedings of the Vertical Flight Society 79th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0079-2023-18047
- Kantzidis, Paul, Vincenzo Muscarello, Pierangelo Masarati, and Nils Böhnisch. 2024. “About the Stabilizing Effect of the Torque on Propeller Whirl Flutter.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1178
- Kappus, Peter G. 1959. “Some Thoughts on VTOL Propulsion.” Journal of the American Helicopter Society 4 (1): 43–48. https://doi.org/10.4050/jahs.4.43
- Karabacak, Mustafa, and Onder Turan. 2026. “Turboshaft Engine Weight Estimation Model Development Based on Statistical Data.” Journal of Aviation 10 (2): 219–27. https://doi.org/10.30518/jav.1771065
- Karamanlis, A., W. Hoelmer, D. Bellomy, R. Freuler, and J. Lee. 1985. “A Universal Turboshaft Engine Test Cell: Design Considerations and Model Test Results.” In 23rd Aerospace Sciences Meeting. AIAA 1985-382. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-382
- Kastrineli, P. L., and W. E. Lightfoot. 1990. “CT7-6: The Most Recent T700 Growth Derivative Engine.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/90-gt-241
- Kaufman, Lawrence A. 1965. “A Concept for the Development of a Universal Automatic Flight Control System for VTOL Aircraft.” Journal of the American Helicopter Society 10 (1): 19–34. https://doi.org/10.4050/jahs.10.19
- Kaul, Upender K. 2012. “Effect of Inflow Boundary Conditions on Hovering Tilt-Rotor Flows.” In ICCFD7 - International Conference on Computational Fluid Dynamics. https://ntrs.nasa.gov/citations/20120016017
- Kaza, Krishna Rao V. 1988. “Development of Aeroelastic Analysis Methods for Turborotors and Propfans, Including Mistuning.” In NASA, Lewis Research Center, Lewis Structures Technology, 1988. Volume 1: Structural Dynamics. https://ntrs.nasa.gov/citations/19880013860
- Kaza, Krishna, Oral Mehmed, Marc Williams, and Larry Moss. 1987. “Analytical and Experimental Investigation of Mistuning in Propfan Flutter.” In 28th Structures, Structural Dynamics and Materials Conference. AIAA 1987-739. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-739
- Kefford, N. F. K., and C. L. Munch. 1975. Conceptual Design Study of 1985 Commercial VTOL Transports That Utilize Rotors. NASA-CR-2532. NASA. https://ntrs.nasa.gov/citations/19750019971
- Keith, Jonathan, and David Hall. 2009. “Rapid Sizing Methodologies for VTOL UAVs.” In 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. AIAA 2009-1617. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2009-1617
- Kellen, Adam, and Moble Benedict. 2018. “Effect of Rotor Geometry on UAV-Scale Cycloidal Rotor Hover Performance.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12682
- Keller, W. 1969. “Reaction Controls for Jet-Lift VTOL Aircraft.” In 5th Propulsion Joint Specialist. AIAA 1969-545. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-545
- Keller, J., Todd R. Quackenbush, Milton E. Teske, Daniel A. Wachspress, and Glen R. Whitehouse. 2006. “A Physics-Based Model of Rotorcraft Brownout for Flight Simulation Applications.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f62-083
- Kelley, H. L. 1962. Transition and Hovering Flight Characteristics of a Tilt-Duct VTOL Research Aircraft. NASA-TN-D-1491. NASA. https://ntrs.nasa.gov/citations/19630000326
- Kemp, E. 1967. “Studies of Exhaust-Gas Recirculation for VTOL Aircraft.” In 3rd Propulsion Joint Specialist Conference. AIAA 1967-439. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1967-439
- Kenyon, George C. 1968. Noise Considerations for V/STOL Transports. AIAA Paper 68-194. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19990111639
- Kerler, Martin R., Christian Schäffer, Wolfgang Erhard, and Volker Gümmer. 2016. “Design Parameter Identification of the Air Supply for a Turboshaft Engine Quick-Start System.” In 52nd AIAA/SAE/ASEE Joint Propulsion Conference. AIAA 2016-5062. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-5062
- Key, David L. 1970. “Models for a VTOL Airplane in Transition.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f26-023
- Kher, Shardul, Carlos E. S. Cesnik, and Divya Sanghi. 2026. “Impact of Spanwise Propeller Placement and Aerodynamic Interaction Effects on Whirl Flutter of Wing-Twin-Propeller Configurations.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0155
- Khurana, Manas, Buvana Jayaraman, Andrew M. Wissink, and Rohit Jain. 2023. “Uncertainty Quantification of Tiltrotor Download Prediction.” In AIAA SCITECH 2023 Forum. AIAA 2023-0809. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-0809
- Khurana, Manas S., Carl R. Russell, and Robert Scott. 2019. “Uncertainty Quantification of a Rotorcraft Conceptual Sizing Toolsuite.” In AIAA Scitech 2019 Forum. AIAA 2019-1728. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1728
- Kier, Thiemo M. 2023. “Comparing Different Potential Flow Methods for Unsteady Aerodynamic Modelling of a Flutter Demonstrator Aircraft.” In AIAA SCITECH 2023 Forum. AIAA 2023-0177. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-0177
- Kilmain, Charles J. 2005. Composite Application for Rotorcraft Drive System Housings. https://doi.org/10.4050/vfs-f61-000260
- Kim, Jinhan. 1990. “Application of the Computational Aeroacoustics Method to an Advancedcounterrotating Propfan Configuration.” In 28th Aerospace Sciences Meeting. AIAA 1990-183. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-183
- Kim, Jong-Hwan. 2005. “Design and Optimization Study on the Multi Flight Modes Canard Rotor/Wing Aircraft with Development of Sizing Program.” Journal of the Korean Society for Aeronautical & Space Sciences 33 (2): 22–31. https://doi.org/10.5139/jksas.2005.33.2.022
- Kim, Jacob. 2026. “Low-Order Longitudinal Simulation of Tilt-Rotor VTOL Transition Flight with Airfoil-Based Aerodynamics and Dynamic Stall.” American Journal of Student Research: 32–52. https://doi.org/10.70251/hyjr2348.453252
- Kim, SungHyeon, Chihyun Ahn, Haryun Choi, and Sang Joon Shin. 2026b. “Investigation on Aeroelastic Instability of a Distributed Propulsion Tiltrotor.” In AIAA SCITECH 2026 Forum. AIAA 2026-2283. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-2283
- Kim, Jinrae, John L. Bullock, Sheng Cheng, and Naira Hovakimyan. 2025b. “Smooth Reference Command Generation and Control for Transition Flight of VTOL Aircraft Using Time-Varying Optimization.” In AIAA SCITECH 2025 Forum. AIAA 2025-1123. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-1123
- Kim, Su-Yean, and Jongwook Choi. 2011. “Flow Analysis around Tilt-Rotor Aircraft at Various Tilt Angles.” Journal of the Korean Society of Visualization 9 (2): 40–47. https://doi.org/10.5407/jksv.2011.9.2.040
- Kim, Jinseong, and Dongkyu Choi. 2016. “Design and Control of a Novel Tiltrotor Platform.” In AIAA Infotech @ Aerospace. AIAA 2016-1254. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-1254
- Kim, Boo Min, Kwang Chan Choi, and Byoung Soo Kim. 2007. “Trajectory Tracking Controller Design Using Neural Networks for Tiltrotor UAV.” In AIAA Guidance, Navigation and Control Conference and Exhibit. AIAA 2007-6460. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2007-6460
- Kim, Yeong-Jun, Inho Jeong, and Haeseong Cho. 2025a. “Aeroelastic Load Analysis of Tiltrotor Using Flexible Multibody Dynamics in Hovering Flight.” Transactions of the Korean Society for Noise and Vibration Engineering 35 (1): 5–14. https://doi.org/10.5050/ksnve.2025.35.1.005
- Kim, Do-Gyun, and Yeongmin Jo. 2025. “Analysis of the Aerodynamic Interaction between Wing and Rotor for a Tilt-Rotor Aircraft.” Journal of the Korean Society for Aeronautical & Space Sciences 53 (5): 479–89. https://doi.org/10.5139/jksas.2025.53.5.479
- Kim, Cheolwan, and Jang Yeon Lee. 2007b. “Numerical Analysis of Hovering Tilt-Rotor UAV for Minimum Download and Ground Effect Analysis.” In 45th AIAA Aerospace Sciences Meeting and Exhibit. AIAA 2007-1400. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2007-1400
- Kim, Yun Su, Sang Hun Lee, and Dong-Kyun Im. 2026a. “Development of a PIDO-Based Integrated Optimization Framework for High-Performance Tiltrotor Blade Design Considering Forward Flight and Hover Flow Conditions.” In AIAA SCITECH 2026 Forum. AIAA 2026-2284. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-2284
- Kim, Jinhan, Eunseok Lee, and Sooseok Yang. 2003. “A Numerical Investigation on the Centrifugal Compressor Stage for a Small Turboshaft Engine.” In Volume 2: Symposia, Parts A, B, and C. ASMEDC. https://doi.org/10.1115/fedsm2003-45118
- Kim, Taehee, and Soo Hyung Park. 2023a. “Aerodynamics Measurement and Computational Analysis for the Fuselage Model of High-Speed Compound Rotorcraft.” Journal of the Korean Society for Aeronautical & Space Sciences 51 (2): 85–92. https://doi.org/10.5139/jksas.2023.51.2.85
- Kim, Tae-Hee, and Soo Hyung Park. 2023b. “Measurement and Analysis on Passive Drag Reduction of High-Speed Compound Rotorcraft Fuselage Model.” Journal of the Korean Society for Aeronautical & Space Sciences 51 (9): 581–87. https://doi.org/10.5139/jksas.2023.51.9.581
- Kim, Tae Seong, SangJoon Shin, and Taehyoun Kim. 2006. “Time and Frequency Domain Analysis of Whirl Flutter Stability in Tiltrotor Aircrafts.” In 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 14th AIAA/ASME/AHS Adaptive Structures Conference 7th. AIAA 2006-1865. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-1865
- Kim, Taeseong, SangJoon Shin, and Do-Hyung Kim. 2012. “Influence of Geometric Coupling on the Whirl Flutter Stability in Tiltrotor Aircraft with Unsteady Aerodynamics.” Journal of Aerospace Engineering 25 (1): 143–48. https://doi.org/10.1061/(asce)as.1943-5525.0000096
- Kim, Daejong, and Mahesh Kumar Varrey. 2012. Feasibility Study of Oil-Free T700 Rotorcraft Engine: Hybrid Foil Bearing and Nonlinear Rotordynamics. https://doi.org/10.4050/vfs-f68-000101
- Kim, Haedong, Marc Williams, and Anastasios Lyrintzis. 2001. “An Improved Method for Rotor Wake Capturing.” In 15th AIAA Computational Fluid Dynamics Conference. AIAA 2001-2669. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2001-2669
- Kimball, Dwayne F. 1993. “Flying Qualities Development and Flight Simulation Evaluation of the TW-68 Tilt-Wing VTOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/932517
- Kimbel, Jamie. 1999. Dynamometer Uncertainties in Turboshaft Acceptance Testing. https://doi.org/10.4050/sm_1999_prop-2515
- Kimbell, M., and A. Whitener. 1980. V/STOL Tilt Rotor Research Aircraft. Volume 1: General Information, Revision C. NASA-CR-166347. NASA. https://ntrs.nasa.gov/citations/19820016318
- Kinzer, John F. 2008. The DP-2 Jet Lift Vertical Takeoff and Landing Aircraft Advanced Technology Demonstration Program. https://doi.org/10.4050/vfs-f64-000386
- Kirby, Robert H. 1961. Aerodynamic Characteristics of Propeller-Driven VTOL Aircraft. NASA-TN-D-730. NASA. https://ntrs.nasa.gov/citations/20040047148
- Kirby, R. 1964. “Dynamic Tests of V/stol Transport Models.” In Transport Aircraft Design and Operations Meeting. AIAA 1964-619. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-619
- Kirby, R. H., M. O. McKinney, and W. A. Newsom. 1963. Aerodynamic Factors to Be Considered in the Design of Tilt-Wing V/STOL Airplanes. NASA. https://ntrs.nasa.gov/citations/19630018924
- Kirby, R. H., and W. A. Newsom Jr. 1964. Flight Investigation of Stability and Control Characteristics of a 1/9-Scale Model of a Four-Propeller Tilt-Wing V/stol Transport. NASA-TN-D-2443. NASA. https://ntrs.nasa.gov/citations/19640020182
- Kirby, R. H., and L. P. Parlett. 1964. Test Techniques Used by Nasa for Investigating Dynamic Stability Characteristics of V/stol Models. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19640007101
- Kirker, T. 1990. “Procurement and Testing of a 1/5 Scale Advanced Counter Rotating Propfan Model.” In 13th Aeroacoustics Conference. AIAA 1990-3975. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3975
- Kish, J. 1990. Advanced Rotorcraft Transmission (ART) Program Review. https://doi.org/10.4050/sm_rwp_1990-1481
- Kish, Jules. 1991. “Advanced Rotorcraft Transmission (ART) Program Status.” In 27th Joint Propulsion Conference. AIAA 1991-1909. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-1909
- Kitaplioglu, C., M. Betzina, and W. Johnson. 2000. “Blade-Vortex Interaction of an Isolated Full-Scale XV-15 Tilt-Rotor.” In American Helicopter Society 56th Annual Forum. https://ntrs.nasa.gov/citations/20100023447
- Kitaplioglu, Cahit, M. McCluer, C. W. Acree Jr., and William Warmbrodt. 1997. Comparison of Full-Scale XV-15 Wind Tunnel and in-Flight Blade-Vortex Interaction Noise. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20020040964
- Kizhakkepat, Amarjit, and Glenn Alan Shimek. 2020. Method of Blade Fold for Tiltrotor Aircraft. https://patents.google.com/patent/US10858094B2/en
- Kjerstad, Kevin J., and John W. Paulson Jr. 1993. Transition Aerodynamics for 20-Percent-Scale VTOL Unmanned Aerial Vehicle. NASA-TM-4419. NASA. https://ntrs.nasa.gov/citations/19930017843
- Klann, Gary A., Richard L. Barth, and Thomas J. Biesiadny. 1984. “Temperature Distortion Generator for Turboshaft Engine Testing.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/841541
- Klimchenko, Vera, and James D. Baeder. 2020. “CFD/CSD Study of Interactional Aerodynamics of a Coaxial Compound Helicopter in High-Speed Forward Flight.” In AIAA Scitech 2020 Forum. AIAA 2020-0304. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-0304
- Klimchenko, Vera, Byung-Young Min, and Brian Wake. 2023. “Model and Full-Scale Rotor Hover Performance Analysis Using HELIOS/OVERFLOW.” In AIAA SCITECH 2023 Forum. AIAA 2023-1188. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1188
- Klingloff, Robert F., Wladimir Sardanowsky, and Robert C. Baker. 1965. “The Effect of VTOL Design Configuration on Power Required for Hover and Low Speed Flight.” Journal of the American Helicopter Society 10 (3): 2–14. https://doi.org/10.4050/jahs.10.2
- Knapp, Douglas. 2023. Next Generation Rotorcraft Transmission (NGRT). https://doi.org/10.4050/sm_2023_prop-992
- Knott, P. 1977. “V/STOL Aerodynamic Testing Techniques at British Aircraft Corporation.” In V/STOL Conference. AIAA 1977-584. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1977-584
- Koch, Christopher. 2025. “Sensitivity of Propeller Whirl Flutter with Respect to Blade Parameters.” In AIAA SCITECH 2025 Forum. AIAA 2025-0430. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-0430
- Koch, Christopher, and Benedikt Koert. 2023. “Influence of Blade Elasticity on Propeller Whirl Flutter Stability.” In AIAA SCITECH 2023 Forum. AIAA 2023-1307. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1307
- Kodama, Hidekazu, and Masanobu Namba. 1992. “Lifting Surface Theory for Steady Aerodynamic Analysis of Ducted Counter Rotation Propfan.” In Volume 1: Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/92-gt-014
- Koenig, D. G. 1984. V/STOL Wind-Tunnel Testing. NASA-TM-85936. NASA. https://ntrs.nasa.gov/citations/19840016460
- Koenig, D. G., T. N. Aiken, K. Aoyagi, and M. D. Falarski. 1977. Large-Scale V/STOL Testing. AIAA PAPER 77-586. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19770052091
- Koenig, D. G., and H. C. Quigley. 1960. The Effect of Blade Flapping on the Dynamic Stability of a Tilting-Rotor Convertiplane. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19630004820
- Kohn, A. O. 1972. “Military Vertical Takeoff and Landing (VTOL) Propulsion Systems Design.” In ASME 1972 International Gas Turbine and Fluids Engineering Conference and Products Show. American Society of Mechanical Engineers. https://doi.org/10.1115/72-gt-73
- Kong, Changduk, Myoungcheol Kang, Jayoung Ki, Jongha Park, and Sooseok Yang. 2004. “Steady-State/Transient Performance Simulation of the Propulsion System for the Canard Rotor Wing UAV during Flight Mode Transition.” In Volume 7: Turbo Expo 2004. ASMEDC. https://doi.org/10.1115/gt2004-53739
- Kong, Changduk, and Youngju Koo. 2011. “GUI Type Fault Diagnostic Program for a Turboshaft Engine Using Fuzzy and Neural Networks.” International Journal of Turbo and Jet Engines 28 (1). https://doi.org/10.1515/tjj.2011.003
- Kong, Chang-Duk, Kyung-Sun Lee, Hyun-Bum Park, and Won Choi. 2012. “Design on High Efficiency and Light Composite Propeller Blade of High Speed Turboprop Aircraft.” Journal of the Korean Society of Propulsion Engineers 16 (3): 57–68. https://doi.org/10.6108/kspe.2012.16.3.057
- Kong, Changduk, Jongha Park, and Myoungcheol Kang. 2005. “A Study on Transient Performance Characteristics of the Canard Rotor Wing Type Unmanned Aerial Vehicle Propulsion System during Flight Mode Transition.” Journal of Engineering for Gas Turbines and Power 128 (3): 573–78. https://doi.org/10.1115/1.2135821
- Koning, Witold J. F. 2015. “Wind Tunnel Interference Effects on Tilt Rotor Testing Using Computational Fluid Dynamics.” PhD diss., Science and Technology Corp.. https://ntrs.nasa.gov/citations/20160004199
- Koning, Witold J. F. 2016. Wind Tunnel Interference Effects on Tilt Rotor Testing Using Computational Fluid Dynamics. NASA/CR-2015-219086. NASA. https://ntrs.nasa.gov/citations/20170000663
- Koning, Witold J. F., C. W. Acree Jr., and Ganesh Rajagopalan. 2016. “Using RotCFD to Predict Isolated XV-15 Rotor Performance.” In AHS Technical Meeting on Aeromechanics Design for Vertical Lift. https://ntrs.nasa.gov/citations/20190001475
- Kopra, Timothy, Dimitri Mavris, Patrick Gomez, and Daniel Schrage. 1994. “Application of a Concurrent Engineering Methodology to the Design of a Dual Use VTOL Aircraft.” In 5th Symposium on Multidisciplinary Analysis and Optimization. AIAA 1994-4329. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1994-4329
- Koratkar, Nikhil, and Inderjit Chopra. 2001. “Open-Loop Hover and Wind Tunnel Testing of Mach-Scaled Rotor with Trailing-Edge Flaps.” In 19th AIAA Applied Aerodynamics Conference. AIAA 2001-1358. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2001-1358
- Kordan, K. D., E. Von Lavante, and T. A. White. 1985. “An Alternative Method of Calculating Propeller Noise Generated at Transonic Tip Speeds, Including Non-Linear Effects.” In 23rd Aerospace Sciences Meeting. AIAA 1985-2. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-2
- Koruyucu, Elif, Önder Altuntaş, and T. Hikmet Karakoç. 2020. “Exergetic Investigation of a Turboshaft Helicopter Engine Related to Engine Power.” SAE International Journal of Aerospace 13 (2): 257–67. https://doi.org/10.4271/01-13-02-0019
- Kottapalli, Sesi. 1998. “Neural Network Research on Validating Experimental Tilt-Rotor Performance.” In 16th AIAA Applied Aerodynamics Conference. AIAA 1998-2418. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1998-2418
- Kottapalli, Sesi. 2020. “Loads Correlation of a Full-Scale Proprotor on the Tiltrotor Test Rig.” In Transformative Vertical Flight 2020. https://ntrs.nasa.gov/citations/20200000511
- Kottapalli, Sesi, and C. W. Acree Jr. 2018. “Analytical Performance, Loads, and Aeroelastic Stability of a Full-Scale Isolated Proprotor.” In AHS Specialist’’s Conference on Aeromechanics Design for Transformative Vertical Flight. https://ntrs.nasa.gov/citations/20180008646
- Kottapalli, Sesi, and W. Cecil. 2019. “Correlation of Full-Scale Isolated Proprotor Performance and Loads.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14568
- Kottapalli, Anjaney P., and Franklin D. Harris. 2010. “Converting a C-130 Hercules into a Compound Helicopter: A Conceptual Design Study.” In AHS Aeromechanics Specialists’’ Conference. https://ntrs.nasa.gov/citations/20100023291
- Kottapalli, Anjaney P., and Franklin D. Harris. 2012. “Converting a C-130 Hercules into a Compound Helicopter: A Conceptual Design Study.” In AHS Specialists’’ Conference on Aeromechanics. https://ntrs.nasa.gov/citations/20130011015
- Kottapalli, Sesi, and Victor Meza. 1992. “Analytical Aeroelastic Stability Considerations and Conversion Loadsfor an XV-15 Tilt-Rotor in a Wind Tunnel Simulation.” In 33rd Structures, Structural Dynamics and Materials Conference. AIAA 1992-2258. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-2258
- Kottapalli, Sesi B., Carl R. Russell, Cecil W. Acree, and Thomas R. Norman. 2019. “Aeroelastic Stability Analysis of a Full-Scale Isolated Proprotor on the Tiltrotor Test Rig.” In AIAA Scitech 2019 Forum. AIAA 2019-2134. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-2134
- Kozachyn, Mark, Jonathan P. Bednar, Richard Keith Naffin, and Mark Robuck. 2016. “Seeded Fault Testing of Hybrid Bearings in a Rotorcraft Transmission.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0072-2016-11595
- Kozapalli, S., and William Warmbrodt. 1997. Neural Network Research on Tilt-Rotor Hover Performance. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20020062770
- Koziol, Paul. 2013. “Robust Control Law Development for a Turboshaft Engine.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-0127
- Krantz, Timothy L. 1994. “NASA/Army Rotorcraft Transmission Research, a Review of Recent Significant Accomplishments.” In Proceedings of the Vertical Flight Society Forum 50 - Washington, D.C. 1994. The Vertical Flight Society. https://doi.org/10.4050/vfs-f50-1033
- Krantz, T., and J. Kish. 1992. “Advanced Rotorcraft Transmission (ART) Program Summary.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3365. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3365
- Kratz, Jonathan, and Dennis Culley. n.d. “Enhancement of an Electrified Tilt-Wing Propulsion System Using Turbine Electrified Energy Management.” In AIAA SciTech Forum and Exposition 2021. https://ntrs.nasa.gov/citations/20205010868
- Kreshock, Andrew R., Cecil W. Acree, Hao Kang, and Hyeonsoo Yeo. 2019b. “Development of a New Aeroelastic Tiltrotor Wind Tunnel Testbed.” In AIAA Scitech 2019 Forum. AIAA 2019-2133. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-2133
- Kreshock, Andrew R., Us Army Devcom AvMC, Robert Thornburgh, Hao Kang, and Hyeonsoo Yeo. 2025b. “Experimental and Analytical Comparison of Whirl-Flutter Stability Varying the Control System Geometry.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0206
- Kreshock, Andrew R., Benjamin Cobb, and Robert Thornbrugh. 2026. “Hingeless Rotor Whirl Flutter Stability Predictions for TRAST.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0077
- Kreshock, Andrew R., Dagid Piatak, Robert Thornburgh, Matthew L. Wilbur, Hao Kang, and Martin K. Sekula. 2023b. “Initial Whirl-Flutter Characterization of the TiltRotor Aeroelastic Stability Testbed.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18037
- Kreshock, Andrew R., and Robert P. Thornburgh. 2024. Ground Vibration Testing of the TiltRotor Aeroelastic Stability Testbed. NASA/TM-20240004747. NASA. https://ntrs.nasa.gov/citations/20240004747
- Kreshock, Andrew R., Robert Thornburgh, and Matthew Wilbur. 2022. “Overview of the TiltRotor Aeroelastic Stability Testbed.” In AIAA SCITECH 2022 Forum. AIAA 2022-0566. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-0566
- Kreshock, Andrew, Robert Thornburgh, Matthew Wilbur, Hao Kang, David J. Piatak, and Martin Sekula. 2023a. “Initial Characterization of the TiltRotor Aeroelastic Stability Testbed.” In 79th Annual Vertical Flight Society (VFS) Forum & Technology Display. https://ntrs.nasa.gov/citations/20230007174
- Kreshock, Andrew R., Robert Thornburgh, and Hyeonsoo Yeo. 2019a. “Comparison of Comprehensive Analyses Predicting Whirl Flutter Stability of the Wing and Rotor Aeroelastic Test System.” Journal of the American Helicopter Society 64 (4): 1–12. https://doi.org/10.4050/jahs.64.042010
- Kreshock, Andrew R., and Hyeonsoo Yeo. 2017. “Tiltrotor Whirl-Flutter Stability Predictions Using Comprehensive Analysis.” In 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2017-0639. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-0639
- Kress, R. 1980. “Surface Combatant Fleet Offensive/defensive Enhancement by High Performance Turbofan VTOL Aircraft.” In Aircraft Systems Meeting. AIAA 1980-1811. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-1811
- Kröger, G., U. Siller, T. Moser, and S. Hediger. 2014. “Towards a Highly Efficient Small Scale Turboshaft Engine: Part I — Engine Concept and Compressor Design.” In Volume 2B: Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2014-26368
- Krüger, Wolf R. 2015. “Multibody Analysis of Whirl Flutter Stability on a Tiltrotor Wind Tunnel Model.” Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 230 (2): 121–33. https://doi.org/10.1177/1464419315582128
- Kucab, Jamie, Marvin Moulton, Meng Fan, and John Steinhoff. 1999. “The Prediction of Rotor Flows in Ground-Effect with a New Hybrid Method.” In 17th Applied Aerodynamics Conference. AIAA 1999-3222. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1999-3222
- Kuhn, R. E. 1960. Review of Basic Principles of v STOL Aerodynamics. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19630004808
- Kuhn, R. E. 1965. Ground Effects on V/stol and Stol Aircraft. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19650021530
- Kuhn, R. E. 1967. Technological Gaps in V/STOL Development. NASA-TM-X-60770. NASA. https://ntrs.nasa.gov/citations/19680003495
- Kuhn, Richard E. 1979. Height of Spray Produced by Vertical Takeoff and Landing (VTOL) Aircraft,. Defense Technical Information Center. https://doi.org/10.21236/ada073099
- Kuhn, R. E. 1987. “V/STOL and STOL Ground Effects and Testing Techniques.” In Proceedings of the 1985 NASA Ames Research Center’s Ground-Effects Workshop. https://ntrs.nasa.gov/citations/19870014978
- Kuhn, R. E., M. O. McKinney Jr., and J. P. Reeder. 1964. Aerodynamics and Flying Qualities of Jet V/stol Airplanes. ASME PAPER-864A. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19640013464
- Kuhn, R. E., and R. D. Vogler. 1965. Longitudinal and Lateral Stability Characteristics of Two Four-Jet VTOL Models in the Transition Speed Range. NASA-TM-X-1092. NASA. https://ntrs.nasa.gov/citations/19660013636
- Kumar, Sumit, and R. Vijayakumar. 2020. “CFD Study of Coupled Flow Due to Frigate Airwake and Helicopter Rotor Downwash on Flight Deck.” In Lecture Notes in Civil Engineering. Springer Singapore. https://doi.org/10.1007/978-981-15-8506-7_44
- Kunz, Donald. 2002. “Analysis of Prop-Rotor Whirl Flutter: Review and Update.” In 43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2002-1602. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-1602
- Kuo, Peter S. 1979. “Application of Finite-Element and Holographic Techniques in the Design of Turboshaft Engine Components.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f35-040
- Kurbjun, Max C. 1959. Noise Survey under Static Conditions of a Turbine-Driven Transonic Propeller with an Advance Ratio of 4.0. NASA-MEMO-4-18-59L. NASA. https://ntrs.nasa.gov/citations/19980228220
- Kutney, J. 1964. “Propulsion System Development for V/STOL TRANSPORTS.” In Transport Aircraft Design and Operations Meeting. AIAA 1964-606. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-606
- Kuvshinov, Vladimir Mikhailovich. 2016. “Design of Integral Control Algorithms for Fly-by-Wire Control System of Advanced High-Speed Helicopter.” TsAGI Science Journal 47 (1): 95–109. https://doi.org/10.1615/tsagiscij.2016017070
- Kuznetsov, N. 1993. “Propfan Engines.” In 29th Joint Propulsion Conference and Exhibit. AIAA 1993-1981. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-1981
- Kvaternik, R. G. 1973a. “Studies in Tilt Rotor VTOL Aircraft Aeroelasticity, Volume 2.” PhD diss., NASA Langley Research Center. https://ntrs.nasa.gov/citations/19730020245
- Kvaternik, R. G. 1973b. “Studies in Tilt-Rotor VTOL Aircraft Aeroelasticity, Volume 1.” PhD diss., NASA Langley Research Center. https://ntrs.nasa.gov/citations/19730020244
- Kvaternik, R. G. 1974. Experimental and Analytical Studies in Tilt-Rotor Aeroelasticity. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19740054748
- Kvaternik, Raymond G., Jer-Nan Juang, and Richard L. Bennett. 2000. Exploratory Studies in Generalized Predictive Control for Active Aeroelastic Control of Tiltrotor Aircraft. NASA/TM2000-210552. NASA. https://ntrs.nasa.gov/citations/20000115608
- Kvaternik, R. G., and J. S. Kohn. 1977. An Experimental and Analytical Investigation of Proprotor Whirl Flutter. NASA-TP-1047. NASA. https://ntrs.nasa.gov/citations/19780004096
- Kvaternik, Raymond G., David J. Piatak, Mark W. Nixon, et al. 2002. “An Experimental Evaluation of Generalized Predictive Control for Tiltrotor Aeroelastic Stability Augmentation in Airplane Mode of Flight.” Journal of the American Helicopter Society 47 (3): 198–208. https://doi.org/10.4050/jahs.47.198
- Kvaternil, Raymond G. 2006. Analyzing Aeroelastic Stability of a Tilt-Rotor Aircraft. LAR-17175-1. NASA Langley Research Center. https://ntrs.nasa.gov/citations/20110013104
- Kyoung-Moo Min et al, Kyoung-Moo Min et al., and Tjprc. 2019. “Design , Flight Test Result of a Small Scale Hybrid VTOL UAV.” International Journal of Mechanical and Production Engineering Research and Development 9 (2): 203–10. https://doi.org/10.24247/ijmperdapr201919
- l’Anson, L. 1969. “High Bypass Ratio Compound Fan-Shaft Engines for Convertible Rotary Wing Aircraft.” In ASME 1969 Gas Turbine Conference and Products Show. American Society of Mechanical Engineers. https://doi.org/10.1115/69-gt-51
- LaBiche, Mitchell. 2003. “Unconventional VTOL Aircraft Design.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f59-000266
- Lade, Tobias, and Sébastien Guérin. 2026. “Efficiency–Noise Trade–Off of Downscaled eVTOL Tiltrotor: A Low–Fidelity Multi-Objective Optimisation Framework.” In 32nd AIAA/CEAS Aeroacoustics Conference (2026). AIAA 2026-3470. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-3470
- Lake, E. 1990. “Focusing Propulsion and Lift System Development for an Evolving Special Operations Aircraft.” In 26th Joint Propulsion Conference. AIAA 1990-2277. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-2277
- Lakkis, Jonathan, and Cees Bil. 2021. “Conceptual Design Study of a High-Altitude Mountain Rescue Rotorcraft.” In Advances in Transdisciplinary Engineering. IOS Press. https://doi.org/10.3233/atde210129
- Lakshmi, C., R. Raghupathy, Simon K. John, and S. N. Mistry. 2023. “Reliability Analysis of a Turboshaft Engine.” Journal of Aerospace Sciences and Technologies: 35–40. https://doi.org/10.61653/joast.v66i1.2014.435
- Lakshminarayan, Vinod, Brandon Bush, Karthikeyan Duraisamy, and James Baeder. 2006. “Computational Investigation of Micro Hovering Rotor Aerodynamics.” In 24th AIAA Applied Aerodynamics Conference. AIAA 2006-2819. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-2819
- Lampkin, B. A. 1980. A Candidate V/STOL Research Aircraft Design Concept Using an S-3A Aircraft and 2 Pegasus 11 Engines. NASA-TM-81204. NASA. https://ntrs.nasa.gov/citations/19800015801
- Lampl, David E., and Sophie F. Armanini. 2023. “Energy-Based Preliminary Sizing and Hover Performance Assessment of Hybrid-Electric VTOL Aircraft.” In AIAA AVIATION 2023 Forum. AIAA 2023-3923. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-3923
- Lancaster, Glenn, Jim C. Narramore, and Chunhua Sheng. 2007. “Application of Computational Fluid Dynamics during the Conceptual Design of the Bell JHL Quad Tiltrotor.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f63-000070
- Lander, J., and J. Palcza. 1974. “Exhaust Nozzle Deflector Systems for V/STOL Fighter Aircraft.” In 10th Propulsion Conference. AIAA 1974-1169. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1974-1169
- Landgrebe, A. 1969. “An Analytical Method for Predicting Rotor Wake Geometry.” In VTOL Research, Design, and Operations Meeting. AIAA 1969-196. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-196
- Landgrebe, Anton J. 1971. An Analytical and Experimental Investigation of Helicopter Rotor Hover Performance and Wake Geometry Characteristics. Defense Technical Information Center. https://doi.org/10.21236/ad0728835
- Landgrebe, Anton J. 1972. “The Wake Geometry of a Hovering Helicopter Rotor and Its Influence on Rotor Performance.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f28-011
- Lang, Jinxi, Yan Li, Yuqing Qiu, and Zhong Wang. 2024a. “Development of a Mathematical Model of a Coaxial Compound Helicopter for Trimming and Stability Analysis.” Journal of Aerospace Engineering 37 (5): 04024053. https://doi.org/10.1061/jaeeez.aseng-5077
- Lange, Roy H. 1986. “A Review of Advanced Turboprop Transport Aircraft.” Progress in Aerospace Sciences 23 (2): 151–66. https://doi.org/10.1016/0376-0421(86)90003-5
- Large Scale Wind Tunnel Investigation of a Folding Tilt Rotor. 1972. NASA-CR-114464. NASA. https://ntrs.nasa.gov/citations/19720022363
- Lavi, R. 1966. “Full-Scale Wind Tunnel Investigation of VTOL LIFT-ENGINE Inlet Performance and Operation.” In 2nd Propulsion Joint Specialist Conference. AIAA 1966-655. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1966-655
- Lawrence, Thomas H., and Phillip J. Gold. 1990. Control Law System for X-Wing Aircraft. Patent Application Number: US-PATENT-APPL-SN-256937. Ames Research Center. https://ntrs.nasa.gov/citations/20080008256
- Lawrence, Ben, Carlos A. Malpica, Colin R. Theodore, William A. Van Decker, and James Lindsey. 2011. Flight Dynamics Aspects of a Large Civil Tiltrotor Simulation Using Translational Rate Command. https://doi.org/10.4050/vfs-f67-000264
- Lawrence, Ben, Colin R. Theodore, Tom Berger, et al. 2016b. “Integrating Flight Dynamics & Control Analysis and Simulation in Rotorcraft Conceptual Design.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0072-2016-11402
- Lawrence, Ben, Colin Theodore, Wayne Johnson, and Tom Berger. 2016a. “Handling Qualities Optimization for Rotorcraft Conceptual Design.” In Royal Aeronautical Society. https://ntrs.nasa.gov/citations/20180008704
- Lawrence, B., C. R. Theodore, W. Johnson, and T. Berger. 2018. “A Handling Qualities Analysis Tool for Rotorcraft Conceptual Designs.” Aeronautical Journal 122 (1252): 960–87. https://doi.org/10.1017/aer.2018.43
- Le, Dzu, Albert Owen, and Duane Mattern. 1996. “Multiscale Analysis of Stall Inception and Instabilities in an Axi-Centrifugal Turboshaft Engine.” In 32nd Joint Propulsion Conference and Exhibit. AIAA 1996-3174. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1996-3174
- Lebacqz, J. V., and E. W. Aiken. 1975a. “A Flight Investigation of Control, Display, and Guidance Requirements for Decelerating Descending VTOL Instrument Transitions Using the X-22A Variable Stability Aircraft.” In Proceedings of the Vertical Flight Society Forum 31 - Washington, D.C. 1975. The Vertical Flight Society. https://doi.org/10.4050/vfs-f31-028
- Lebacqz, J. V., and E. W. Aiken. 1975b. “Results of a Flight Investigation of Control-Display Interactions for VTOL Decelerating Descending Instrument Approaches Using the X-22A Aircraft.” In NASA. Ames Res. Center 11th Ann. Conf. on Manual Control. https://ntrs.nasa.gov/citations/19750025622
- Lebacqz, J., and R. Chen. 1977. “Design and Flight Test of a Decoupled Velocity Control System for VTOL Landing Approach.” In Guidance and Control Conference. AIAA 1977-1143. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1977-1143
- Lebacqz, J., and R. Radford. 1978. “An Experimental Investigation of Control-Display Requirements for a Jet-Lift VTOL Aircraft in the Terminal Area.” In 4th Atmospheric Flight Mechanics Conference. AIAA 1978-1363. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1978-1363
- Lecuyer, M. 1970. “Correlation of Turbofan Engine Thrust Performance with Compound Nozzle Flow Theory.” In 6th Propulsion Joint Specialist Conference. AIAA 1970-612. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1970-612
- Lee, YikLoon, and James Baeder. 2003. “Vortex Tracking in Overset Method for Quad Tilt Rotor Blade Vortex Interaction.” In 21st AIAA Applied Aerodynamics Conference. AIAA 2003-3531. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-3531
- Lee, Bumseok, and James D. Baeder. 2021. “The Effect of Time Marching on the Wake Structure Breakdown in a Hovering Rotor Simulation.” In AIAA Scitech 2021 Forum. AIAA 2021-0736. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-0736
- Lee, Seungcheol, Seokbong Chae, Yisu Shin, and Jooha Kim. 2026. “Aerodynamic Effects of Rotor–rotor Interaction on a Twin-Rotor System in Ground Effect.” Journal of Fluid Mechanics 1031: A42. https://doi.org/10.1017/jfm.2026.11347
- Lee, Seongkyu, and Maxime Dassonville. 2019. “Iterative Blade Element Momentum Theory for a Coaxial Rotor.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14510
- Lee, Seongkyu, and Maxime Dassonville. 2020. “Iterative Blade Element Momentum Theory for Predicting Coaxial Rotor Performance in Hover.” Journal of the American Helicopter Society 65 (4): 1–12. https://doi.org/10.4050/jahs.65.042005
- Lee, Jiwon, and Youdan Kim. 2024. “MPC-Based Longitudinal Control Design for a Fixed-Wing VTOL UAV in Transition Flight.” In AIAA SCITECH 2024 Forum. AIAA 2024-0141. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-0141
- Lee, Hanna, Jinrae Kim, Seokwon Lee, and Youdan Kim. 2025. “Unified Control of VTOL Fixed-Wing UAV for Transition Flight Using Generalized Extended State Observer.” Preprint, . https://doi.org/10.2139/ssrn.5521527
- Lee, Myeong Kyu, and Chi-Hoon Lee. 2016. “Increasing Endurance Performance of Tiltrotor UAV Using Extended Wing.” Journal of Aerospace System Engineering 10 (1): 111–17. https://doi.org/10.20910/jase.2016.10.1.111
- Lee, A., and M. Mosher. 1979. “An Acoustical Study of the XV-15 Tilt Rotor Research Aircraft.” In 5th Aeroacoustics Conference. AIAA 1979-612. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1979-612
- Lee, Hoogyoung, Rachit Prasad, and Seongim Choi. 2016. “Aerodynamic Analysis for Conceptual Design of a Lift-Fan Type Aircraft.” In 34th AIAA Applied Aerodynamics Conference. AIAA 2016-3408. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-3408
- Lee-Rausch, Elizabeth M., and Robert T. Biedron. 2009. Simulation of an Isolated Tiltrotor in Hover with an Unstructured Overset-Grid RANS Solver. https://doi.org/10.4050/vfs-f65-000343
- Leese, G. W. 1964. Helicopter Downwash Blast Effects Study. Defense Technical Information Center. https://doi.org/10.21236/ad0452177
- Leese, Grady W., and John T. Knight Jr. 1974. Helicopter Downwash Data. Defense Technical Information Center. https://doi.org/10.21236/ad0780754
- Lefevre, Lauriane, Vianney Nowinski, Jerome Delva, and Antoine Dazin. 2022b. “Experimental Velocity Fields Evaluation under the Rotor/Propeller Interactions for High Speed Helicopters for Different Propeller Positions.” Preprint, Research Square. https://doi.org/10.21203/rs.3.rs-1753067/v1
- Lehman, August F. 1971. Model Studies of Helicopter Tail Rotor Flow Patterns in and out of Ground Effect. Defense Technical Information Center. https://doi.org/10.21236/ad0725591
- Leishman, J. G. 2008. Rotorcraft Brownout: Advanced Understanding, Control and Mitigation. Defense Technical Information Center. https://doi.org/10.21236/ada498268
- Leishman, J. Gordon. 2009. “Aerodynamic Performance Considerations in the Design of a Coaxial Proprotor.” Journal of the American Helicopter Society 54 (1): 12005–1200514. https://doi.org/10.4050/jahs.54.012005
- Leishman, J. G. 2014. Rotorcraft Brownout Advanced Understanding, Control, and Mitigation. Defense Technical Information Center. https://doi.org/10.21236/ada619872
- Leishman, J., and A. Bagai. 1996. “Challenges in Understanding the Vortex Dynamics of Helicopter Rotor Wakes.” In Fluid Dynamics Conference. AIAA 1996-1957. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1996-1957
- Leishman, J. G., Robin Preator, and G. D. Baldwin. 2004. Conceptual Design Studies of a Mono Tiltrotor (MTR) Architecture. Defense Technical Information Center. https://doi.org/10.21236/ada428702
- Lemmon, Mark T., Ralph D. Lorenz, Jason Rabinovitch, et al. 2026. Lifting and Transport of Martian Dust by the Ingenuity Helicopter Rotor Downwash as Observed by High-Speed Imaging from the Perseverance Rover. NASA. https://ntrs.nasa.gov/citations/55203235047601
- Lemmon, Mark T., Ralph D. Lorenz, Jason Rabinovitch, et al. 2022. “Lifting and Transport of Martian Dust by the Ingenuity Helicopter Rotor Downwash as Observed by High-Speed Imaging from the Perseverance Rover.” Preprint, . https://doi.org/10.1002/essoar.10512556.1
- Leng, Yuchen, Thierry Jardin, Jean-Marc Moschetta, and Murat Bronz. 2021. “Analytic Model of Proprotor Forces and Moments at High Incidence.” Journal of the American Helicopter Society 66 (4): 1–15. https://doi.org/10.4050/jahs.66.042002
- Lenski, Joseph, Jr., and Mark Valco. 1992. “Boeing Helicopters Advanced Rotorcraft Transmission (ART) Program Summary of Component Tests.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3364. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3364
- Leoni, R. D., and T. T. Kaplita. 1965. “Research and Development of the Stowed Rotor V/STOL Concept.” In SAE Technical Paper Series, vol. 1. SAE International. https://doi.org/10.4271/650194
- Leth, Siv, Frederick Samuelsson, and Staffan Meijer. 1998. “Propeller Noise Generation and Its Reduction on the Saab 2000 High-Speed Turboprop.” In 4th AIAA/CEAS Aeroacoustics Conference. AIAA 1998-2283. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1998-2283
- Leutzinger, R. 1968. “Development and Optimization of a VTOL-Air Frame Propulsion System.” In 4th Propulsion Joint Specialist Conference. AIAA 1968-638. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1968-638
- Levinsky, E. S., H. U. Thommen, P. M. Yager, and C. H. Holland. 1968. Lifting Surface Theory and Tail Downwash Calculations for V/STOL Aircraft in Transition and Cruise. Defense Technical Information Center. https://doi.org/10.21236/ad0680969
- Lewicki, David G., David Fisher, Gregory F. Heath, Stephen Slaughter, Michael Morris, and Jason R. Fetty. 2009. Face Gear Development under the Rotorcraft Drive System for the 21st Century Program. https://doi.org/10.4050/vfs-f65-000342
- Lewicki, David G., Mark A. Stevens, and Robert F. Handschuh. 2008. Concepts for Variable/Multi-Speed Rotorcraft Drive System. https://doi.org/10.4050/vfs-f64-000273
- Lewis, W. J. 1989. “Propulsion Systems for Supersonic V/STOL Aircraft.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/89-gt-309
- Lewis, Jeffrey. 2017. “Runway Independent High Speed CarterCopter BizJet.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12301
- Lewis, E. L., R. G. Culpepper, and V. R. Hancock. 1978. An Innovative Technique for Static and Dynamic V/STOL Testing. AHS 78-42. U.S. Navy, Naval Air Systems Command, Washington. https://ntrs.nasa.gov/citations/19790034152
- Lewis, G. M., and W. J. Lewis. 1981. “V/STOL Status from the Engine Technology Viewpoint.” In V/STOL Conference. https://ntrs.nasa.gov/citations/19820033378
- Li, Jiayi. 2024. “Study on Aerodynamic Interference of Tilt-Rotor Aircraft at Different Rotor Deflection Angles.” Frontiers in Science and Engineering 4 (10): 17–34. https://doi.org/10.54691/bj05ev30
- Li, Huan, Bin Li, Jiangtao Chen, Pengcheng Cui, and Yaobing Zhang. 2020. “Validation of Momentum Source Method in the Analysis and Prediction of the Rotor Finite Ground Effect in Hover.” Journal of Physics: Conference Series 1600 (1): 012057. https://doi.org/10.1088/1742-6596/1600/1/012057
- Li, Hongyu, Jiaxuan Liu, Junzeng He, et al. 2025c. “Modeling of Turboshaft Engine Rotor and Prediction of Dynamic Response.” Preprint, . https://doi.org/10.2139/ssrn.5340266
- Li, Wen, Shuang Shi, Mou Chen, and Qingxian Wu. 2025b. “Mixed-Auxiliary Systems Based Switching Adaptive Tracking Control for Conversion Mode of Tilt-Rotor Aircraft.” Preprint, . https://doi.org/10.2139/ssrn.5088199
- Li, Gaiqi, Zhen Huan Tang, Yu Lu, Jianfang Wang, Xiaowei Jiang, and Dongyang Ma. 2025e. “Vibration Suppression Design for a Turboshaft Engine with Shared Bearing Cavity Structure.” International Journal of Turbo & Jet-Engines 43 (1): 27–39. https://doi.org/10.1515/tjj-2025-0040
- Li, ZhiQuan, and PinQi Xia. 2014. “Whirl Flutter and Rotor Hub Center’s Motion Image of Tiltrotor Aircraft.” SCIENTIA SINICA Technologica 44 (3): 286–94. https://doi.org/10.1360/092013-1213
- Li, Z., and P. Xia. 2018a. “Aeroelastic Modelling and Stability Analysis of Tiltrotor Aircraft in Conversion Flight.” Aeronautical Journal 122 (1256): 1606–29. https://doi.org/10.1017/aer.2018.93
- Li, ZhiQuan, and PinQi Xia. 2018b. “An Improved Unsteady Aeroelastic Model for Tiltrotor Aircraft in Forward Flight.” SCIENTIA SINICA Technologica 48 (8): 901–7. https://doi.org/10.1360/n092017-00314
- Li, Zehao, Mingchuan Xie, and Weihong Huang. 2026. “Optimization of Variable Geometry Regulation Law for a Turboshaft Turbofan Conversion Engine during Mode Transition Using an LPV Model.” International Journal of Turbo & Jet-Engines. https://doi.org/10.1515/tjj-2026-0082
- Li, Chengxiao, and Yonggang Yang. 2025. “A Self-Powered Vibration Sensor for Real-Time Vibration Monitoring and Aeroelastic Instability Detection in Tiltrotor Aircraft Transition.” AIP Advances 15 (9): 095314. https://doi.org/10.1063/5.0288836
- Li, Danyu, Liang Zhang, Chongsen Mo, and Naigang Cui. 2024. “Application of Improved Appointed Time Control in Helicopter Mode of a Tilt-Rotor Evtol Aircraft.” Preprint, . https://doi.org/10.2139/ssrn.4864679
- Li, Huan, Naichun Zhou, Xiaoquan Gong, Jiangtao Chen, and Youq Deng. 2019. “Application of an Improved Preconditioning Boundary Condition to Simulation of Tiltrotor Aircraft in Hover.” In Lecture Notes in Electrical Engineering. Springer Singapore. https://doi.org/10.1007/978-981-13-3305-7_54
- Liardon, Darrell, Bill Waldron, and Alexander Bernardo. 1998. “Ballistic Testing of Operating V–22 Proprotor Gearboxes.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f54-00014
- Lichota, Piotr. 2023. “Unstable Tilt-Rotor Maximum Likelihood Wavelet-Based Identification from Flight Test Data.” Aircraft Engineering and Aerospace Technology 95 (8): 1275–85. https://doi.org/10.1108/aeat-01-2023-0013
- Lichota, Piotr, and Joanna Szulczyk. 2017. “Output Error Method for Tiltrotor Unstable in Hover.” Archive of Mechanical Engineering 64 (1): 23–36. https://doi.org/10.1515/meceng-2017-0002
- Liden, S. 1980. V/STOLAND Digital Avionics System for XV-15 Tilt Rotor. NASA-CR-152320. NASA. https://ntrs.nasa.gov/citations/19810013517
- Lieblein, S. 1970a. “Problem Areas for Lift Fan Propulsion for Civil VTOL Transports.” In DEUTSCHE GESELLSCHAFT FUER LUFT- UND RAUMFAHRT. https://ntrs.nasa.gov/citations/19710039676
- Lieblein, S. 1970b. “A Review of Lift Fan Propulsion Systems for Civil VTOL Transports.” In 6th Propulsion Joint Specialist Conference. AIAA 1970-670. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1970-670
- Light, Jeffrey S. 1989. Tip Vortex Geometry of a Hovering Helicopter Rotor in Ground Effect. https://doi.org/10.4050/vfs-f45-046
- Light, Jeffrey S. 1993. “Tip Vortex Geometry of a Hovering Helicopter Rotor in Ground Effect.” Journal of the American Helicopter Society 38 (2): 34–42. https://doi.org/10.4050/jahs.38.34
- Light, Jeffrey S., and Alexandra A. Swanson. 1992. “Shadowgraph Flow Visualization of Isolated Tiltrotor and Rotor/wing Wakes.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f48-2034
- Likhite, Isha. 2022. “Design and Analysis of Solar-Powered VTOL Aircraft System for Surveillance.” INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 06 (06). https://doi.org/10.55041/ijsrem16477
- Lim, Joon W. 2019. “Fundamental Investigation of Proprotor and Wing Interactions in Tiltrotor AIrcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14502
- Lim, Y. S., and Y. S. Jung. 2025. “Mid-Fidelity Aerodynamic Analysis of XV-15 Tiltrotor Aircraft during Transient Maneuver.” Journal of computational fluids engineering 30 (3): 74–90. https://doi.org/10.6112/kscfe.2025.30.3.074
- Lim, Taekyung, Hyunjae Lee, Byeonguk Im, Gwangin Ko, Kunhyuk Kong, and Sang Joon Shin. 2024. “Design Investigation of an Engine-Nacelle Tilting Mechanism on the Tiltrotor Aeromechanics and Aeroelasticity.” In AIAA SCITECH 2024 Forum. AIAA 2024-2045. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-2045
- Lim, Jaehoon, SangJoon Shin, and Young-Jung Kee. 2015b. “Optimization of Rotor Structural Design in Compound Rotorcraft with Lift Offset.” Journal of the American Helicopter Society 61 (1): 1–14. https://doi.org/10.4050/jahs.61.012005
- Lim, Jaehoon, SangJoon Shin, and Young-Jung Kee. 2017. “Further Improvement in Rotor Aerodynamics Estimation in Helicopter Conceptual Design and Optimization Framework for a Ompound Rotorcraft.” International Journal of Aeronautical and Space Sciences 18 (4): 641–50. https://doi.org/10.5139/ijass.2017.18.4.641
- Lim, JaeHoon, SangJoon Shin, Young-Jung Kee, and YooJin Kang. 2015a. “Development of Conceptual Design Framework with Rotor Structural Design Optimization for Compound Rotorcraft with a Lift Offset.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10114
- Lim, JaeHoon, SangJoon Shin, Vaitla Laxman, Junemo Kim, and JinSeok Jang. 2014. “Development of an Improved Framework for the Conceptual Design of a Rotorcraft.” Aircraft Engineering and Aerospace Technology 86 (5): 375–84. https://doi.org/10.1108/aeat-10-2012-0177
- Limage, C. 1978. “Evaluation of Inlet Reingestion for Large Bypass Ratio V/STOL Aircraft.” In 14th Joint Propulsion Conference. AIAA 1978-1079. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1978-1079
- Lin, Qing, Xingyu Zhu, Juhong Liu, Ban Wang, and Jing Huang. 2023. “Nonlinear Flight Dynamics Modeling of Hybrid Quad-Tiltrotor Aircraft under Full-Mode Flight.” In Lecture Notes in Electrical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-99-0479-2_182
- Lind, G., and G. Tamplin. 1981. “V/STOL Technology Requirements for Future Fighter Aircraft.” In 17th Joint Propulsion Conference. AIAA 1981-1360. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-1360
- Lindblad, Ingemar. 1989. “Asymptotic Analysis of the Transonic Region of a High-Speed Propeller.” In 12th Aeroacoustic Conference. AIAA 1989-1077. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-1077
- Linden, A. W. 1972. Rotor Systems Research Aircraft of Predesign Study. Volume 1: Summary and Conclusions. NASA-CR-112152. NASA. https://ntrs.nasa.gov/citations/19720025364
- Linden, A., and M. Hellyar. 1974. “The Rotor Systems Research Aircraft: A Flying Wind Tunnel.” In Joint Meeting, Toronto. AIAA 1974-1277. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1974-1277
- Lira Sassett, Lucas, Bruno Fernandez Rodrigues de Sousa, and Marcos Daniel de Freitas Awruch. 2025. “Conceptual Design of a Tiltrotor eVTOL Aircraft for Urban Air Mobility.” In Proceedings of the 28th International Congress of Mechanical Engineering. ABCM. https://doi.org/10.26678/abcm.cobem2025.cob2025-1442
- Litke, Donald P. 1966. “The Compound Helicopter Answer to the V/STOL Dilemma?” Naval Engineers Journal 78 (3): 475–89. https://doi.org/10.1111/j.1559-3584.1966.tb05077.x
- Litt, Jonathan S. 2005. “An Optimal Orthogonal Decomposition Method for Kalman Filter-Based Turbofan Engine Thrust Estimation.” In Volume 1: Turbo Expo 2005. ASMEDC. https://doi.org/10.1115/gt2005-68808
- Litt, Jonathan S. 2007. “An Optimal Orthogonal Decomposition Method for Kalman Filter-Based Turbofan Engine Thrust Estimation.” Journal of Engineering for Gas Turbines and Power 130 (1): 011601. https://doi.org/10.1115/1.2747254
- Liu, David T. 1962. “Rotor Stability Derivatives at High Inflow Ratio Conditions for Tilt Rotor VTOL Aircraft.” Journal of the American Helicopter Society 7 (2): 10–21. https://doi.org/10.4050/jahs.7.2.10
- Liu, Yaolong, Xue Chen, Jiechao Zhang, and Yao Zheng. 2026a. “Efficient Bayesian Optimization Framework for Multi-Objective Tiltrotor Design.” Aircraft Engineering and Aerospace Technology 98 (3): 456–66. https://doi.org/10.1108/aeat-06-2025-0207
- Liu, Yi, Cameron T. Druyor Jr., and Li Wang. 2023. “High-Fidelity Analysis of Lift+Cruise VTOL Urban Air Mobility Concept Aircraft.” In AIAA Aviation Forum and Exposition. https://ntrs.nasa.gov/citations/20230004303
- Liu, John, Robert F. Maciolek, Michael A. McVeigh, and Edward T. Meadowcroft. 1994. “Aerodynamic Design of Nacelle-Mounted Sails for Enhanced Tiltrotor Aircraft Performance.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f50-3333
- Liu, John, Robert J. Mayer, Michael A. McVeigh, and Royce Snider. 1999. “Model and Full-Scale Tiltrotor Hover Download Tests.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f55-31
- Liu, John, and Michael McVeigh. 1991. “Design of Swept Blade Rotors for High-Speed Tiltrotor Application.” In Aircraft Design and Operations Meeting. AIAA 1991-3147. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-3147
- Liu, Sandy Richard, and H. Tadghighi. 1999. “TIN2 Model Developments & Enhancements: A Turbulence Ingestion Noise Prediction for Tiltrotor with Fountain Flow Effects.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f55-00168
- Liu, Z., S. Tang, M. Li, and J. Guo. 2018. “Optimal Control of Thrust-Vectored VTOL UAV in High-Manoeuvering Transition Flight.” Aeronautical Journal 122 (1250): 598–619. https://doi.org/10.1017/aer.2018.1
- Liu, Lin, Therese-Ann Vermillion, and Zachary Wright. 2024b. “High-Fidelity Finite Element Modeling of Rotorcraft Shafting System for Critical Speed Prediction.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1303
- Liu, Yi, and Li Wang. 2024. “High-Fidelity Simulations of Lift+Cruise VTOL Urban Air Mobility Concept Aircraft in Hover.” In AIAA SciTech Forum and Exposition. https://ntrs.nasa.gov/citations/20230016503
- Lockhart, Matthew. n.d. “Characterisation of Wing Joint Aerodynamics in Tilt Wing Unmanned Aerial Vehicles Using Numerical Methods.” PhD diss., The University of Queensland. https://doi.org/10.14264/b8e846c
- Lockheed-Georgia Co Marietta. 1969. The Hummingbird XV-4B VTOL Research Aircraft Program. Defense Technical Information Center. https://doi.org/10.21236/ad0700436
- Loewy, R. G., and R. T. Yntema. 1958. “Some Aeroelastic Problems of Tilt-Wing; VTOL Aircraft.” Journal of the American Helicopter Society 3 (1): 35–57. https://doi.org/10.4050/jahs.3.1.35
- Logan, Andy. 1989. Methods to Improve the Conceptual Design Process for Rotary Wing Aircraft- McDonnell Douglas Helicopter Company. https://doi.org/10.4050/sm_rotary_1989-3454
- Lohry, Mark, Sayan Ghosh, and Ganesh Rajagopalan. 2011. “Graphics Hardware Acceleration for Rotorcraft Brownout Simulation.” In 20th AIAA Computational Fluid Dynamics Conference. AIAA 2011-3224. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2011-3224
- Longhurst, W. S. 1966. “A Report on Stability and Control Testing of a Tilt Wing V/STOL Aircraft.” In SAE Technical Paper Series, vol. 1. SAE International. https://doi.org/10.4271/660315
- Looney, David A. 2009. Current Air Force Combat Search and Rescue Challenges. Defense Technical Information Center. https://doi.org/10.21236/ada540056
- Lopes, Leonard V., Daniel J. Ingraham, and Nikolas S. Zawodny. 2022. “Status of UAM Proprotor Design Validation Campaign: Available Data and Computational Tools.” In Acoustics Technical Working Group. https://ntrs.nasa.gov/citations/20220015053
- Lord, P. A. 1985. Development and Usage of a Small-Scale V/STOL Ground Effects Simulator. AIAA PAPER 85-4037. California State Polytechnic University. https://ntrs.nasa.gov/citations/19860026228
- Lorenz, Ralph D. 2020. “Triboelectric Charging and Brownout Hazard Evaluation for a Planetary Rotorcraft.” In AIAA Aviation 2020 Forum. AIAA 2020-2837. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-2837
- Lou, Gao, Molong Duan, Yu Liang, and Xiaowen Shan. 2024. “Wind Resistant Transition Trajectory Generation of VTOL Aircraft under Control Allocation Framework.” In AIAA SCITECH 2024 Forum. AIAA 2024-2489. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-2489
- Louisse, J., and F. Marshall. 1974. “Prediction of Ground Effects for VTOL Aircraft with Twin Lifting Jets.” In 10th Propulsion Conference. AIAA 1974-1167. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1974-1167
- Louma, A. A. 1961. Longitudinal Aerodynamic Characteristics at Transonic Speeds of Two V/STOL Airplane Configurations with Skewed and Variable-Sweep Wings. NASA-TM-X-527. NASA. https://ntrs.nasa.gov/citations/19660020177
- Lovera, Marco, Luca Vigano, and Matteo Ferraro. 2026. “Modeling and Control of Advanced Tiltrotor Aircraft in Airplane Mode.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0255
- “Low-Speed Aerodynamics of the Trailed-Rotor High-Speed Rotorcraft Concept in Cruise Configuration.” 1991. In 9th Applied Aerodynamics Conference. AIAA 1991-3230. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-3230
- Lowry, R. B. 1979. “Interface Concerns of Ejector Integration in V/STOL Aircraft.” In NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors. https://ntrs.nasa.gov/citations/19800001890
- Lowson, M. V. 1972. “Noise Radiation from V/STOL Aircraft.” In International Council of the Aeronautical Sciences. https://ntrs.nasa.gov/citations/19720057481
- Lu, Yu, Zhen Huan Tang, and Fei Wang. 2023b. “Vibration Reduction Design for a Shared Bearing Bore of a Turboshaft Engine.” Vibroengineering Procedia 49: 1–7. https://doi.org/10.21595/vp.2023.23095
- Lu, Ke, Shanyong Zhao, YUjie Ma, Shangjing Wu, and Cheng da Su. 2021. “The Investigation on Flight Quality of Tilt-Rotor Aircraft.” Aircraft Engineering and Aerospace Technology 93 (10): 1582–90. https://doi.org/10.1108/aeat-03-2021-0071
- Lubiejewski, Sylwester. 2019. “Lotnictwo śmigłowcowe w działaniach bojowych odzyskiwania izolowanego personelu (personnel recovery).” Kwartalnik Bellona 697 (2): 127–44. https://doi.org/10.5604/01.3001.0013.3630
- Luebs, Alan. 2014. “Development of New Engine Control for ETF40B Marine Turboshaft Engine.” In Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2014-26214
- Luidens, R. W., G. E. Turney, and J. Allen. 1981. “Comparison of Two Parallel/series Flow Turbofan Propulsion Concepts for Supersonic V/STOL.” In V/STOL Conf.. https://ntrs.nasa.gov/citations/19820010304
- Luoma, A. A. 1961. Longitudinal Aerodynamic Characteristics at Transonic Speeds of a V/STOL Airplane Configuration with a Fixed Delta Wing Having Auxiliary Variable-Sweep Outboard Panels. NASA-TM-X-661. NASA. https://ntrs.nasa.gov/citations/19660020176
- Lykyanov, Petro, and Roman Adler. 2023. “Analysis of Prospects for the Use of Hybrid Power Plants in Vertical Takeoff and Landing Aircraft.” Mechanics of Gyroscopic Systems, no. 46: 22–33. https://doi.org/10.20535/0203-3771462023302681
- Lyle, Karen H. 1997. XV-15 Structural-Acoustic Data. NASA-TM-112855. NASA. https://ntrs.nasa.gov/citations/19970027894
- Lyle, Karen H., Casey L. Burley, and Devon S. Prichard. 1997. “A Comparison of Measured and Predicted XV-15 Tiltrotor Surface Acoustic Pressures.” In AHS Technical Specialists’’ Meeting for Rotorcraft Acoustics and Aerodynamics. https://ntrs.nasa.gov/citations/20040110388
- Lyman, V., and J. Hancock. 1986. “Correlation of Theory and Experiment for Propfan Inlets.” In 22nd Joint Propulsion Conference. AIAA 1986-1628. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-1628
- Lympany, Shane V., and Juliet A. Page. 2024. “Acoustic Measurements of Full-Scale Electric Vertical Takeoff and Landing Aircraft.” Journal of the Acoustical Society of America 155 (3_Supplement): A152-A152. https://doi.org/10.1121/10.0027133
- Lyrintzis, Anastasios S., J. R. Jameson, and Evangelos K. Koutsavdis. 2000. “Technical Note: A Study of Rotorcraft Blade-Tip Shape High-Speed Impulsive Noise Characteristics.” Journal of the American Helicopter Society 45 (1): 54–57. https://doi.org/10.4050/jahs.45.54
- Ma, Yue, Lu Lin, and Fei Qi. 2019. “Fault Diagnosis of the Motor of Electro-Mechanical Transmission of the High Speed Rotorcraft.” In Lecture Notes in Electrical Engineering. Springer Singapore. https://doi.org/10.1007/978-981-15-0474-7_34
- Ma, Chao, Donglei Sun, and Naira Hovakimyan. 2021. “Modeling and Adaptive Control Law Design for a Bi-Tiltrotor Unmanned Aerial Vehicle.” Journal of Aerospace Engineering 34 (6): 04021090. https://doi.org/10.1061/(asce)as.1943-5525.0001349
- Maass, M. 1995. “Laser-Measurements in Ducted Propfan Blade Wakes.” In 31st Joint Propulsion Conference and Exhibit. AIAA 1995-2657. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1995-2657
- Maass, M., W. Foerster, and P. Thiele. 1994. “Unsteady Flow Experiments in the Exit of a Ducted Propfan Rotor.” In 30th Joint Propulsion Conference and Exhibit. AIAA 1994-2970. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1994-2970
- Mackall, K. G., P. L. Lasagna, K. Walsh, and J. H. Dittmar. 1982. “In-Flight Acoustic Results from an Advanced-Design Propeller at Mach Numbers to 0.8.” In Joint Propulsion Conference. https://ntrs.nasa.gov/citations/19820051482
- Madden, Paul A. 1967. “Angle-of-Attack Distribution of a High Speed Helicopter Rotor.” Journal of the American Helicopter Society 12 (2): 41–49. https://doi.org/10.4050/jahs.12.2.41
- Magee, J. P. 1983a. “The Tilt Rotor Research Aircraft (XV-15) Program.” In American Planning Association Proc. of the Monterey Conf. on Planning for Rotorcraft and Commuter Air Transportation. https://ntrs.nasa.gov/citations/19830012562
- Magee, J. P. 1983b. Tilt Rotor Technology Thrusts. SAE PAPER 831537. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19840046749
- Magee, J. P., and H. R. Alexander. 1973. V/STOL Tilt Rotor Aircraft Study: Wind Tunnel Tests of a Full Scale Hingeless Prop/rotor Designed for the Boeing Model 222 Tilt Rotor Aircraft. NASA-CR-114664. NASA. https://ntrs.nasa.gov/citations/19740007598
- Magee, J. P., and H. R. Alexander. 1978. A Hingeless Rotor XV-15 Design Integration Feasibility Study. Volume 1: Engineering Design Studies. NASA-CR-152310. NASA. https://ntrs.nasa.gov/citations/19800009766
- Magee, John, and Robert Taylor. 1971. Wind Tunnel Test of the Conversion Process of a Folding Tilt Rotor Aircraft Using a Semispan Unpowered Model. Volume 4. Part 1. Analysis and Results. Defense Technical Information Center. https://doi.org/10.21236/ad0735632
- Magee, J., and K. Wernicke. 1979. “XV-15 Tilt Rotor Research Aircraft: Program Report.” In Atlantic Aeronautical Conference. AIAA 1979-704. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1979-704
- Maggitti, L. 1965. V/stol Plenum Chamber Combustion Research Study, Phase i Final Report. NASA-CR-63093. NASA. https://ntrs.nasa.gov/citations/19650015373
- Magliocco, Giusi. 2026. “Whirl Flutter: An Experimental, Numerical, and Analytical Study on a Small-Scale Demonstrator.” In Materials Research Proceedings, vol. 69. Materials Research Forum LLC. https://doi.org/10.21741/9781644904251-65
- Magliocco, Giusi, Salvatore Merola, Francesco Marulo, and Michele Guida. 2026. “Integrated Numerical–Experimental Contactless Modal Analysis of Aerospace Structures and Whirl Flutter Investigation via Eulerian Video Magnification.” Preprint, . https://doi.org/10.2139/ssrn.6351263
- Magliozzi, B. 1984. “Advanced Turboprop Noise: A Historical Review.” In 9th Aeroacoustics Conference. AIAA 1984-2261. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-2261
- Magnuson, Ronald A., Roger L. Marr, Philip J. Dunford, and Ken Lunn. 1992. “V-22 Tiltrotor Flight Test Development.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f48-9908
- Mair, Christopher, Djamel Rezgui, and Branislav Titurus. 2019. “Stability Analysis of Whirl Flutter in a Nonlinear Gimballed Rotor-Nacelle System.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14584
- Maisel, M., and D. Harris. 1981. “Hover Tests of the XV-15 Tilt Rotor Research Aircraft.” In 1st Flight Test Conference. AIAA 1981-2501. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-2501
- Makarov, D. A. 2019. “Simulation of Observer Based Tracking Control for the Longitudinal Dynamics Model of a Vertical Takeoff and Landing Aircraft.” Mathematics and Mathematical Modeling, no. 6: 72–87. https://doi.org/10.24108/mathm.0618.0000164
- Makhtar, Siti Noormiza, Muhammad Danish Adha Mohd Samsuddin, Fareisya Zulaikha Mohd Sani, Elya Mohd Nor, and Baizura Bohari. 2024. “Development of Mobile Indoor Flight Test Rig for VTOL UAV Application.” Journal of Physics: Conference Series 2928 (1): 012002. https://doi.org/10.1088/1742-6596/2928/1/012002
- Makkar, Gaurav, Jean-Paul Reddinger, Farhan S. Gandhi, and Fotis P. Kopsaftopoulos. 2021. “Machine Learning Based Approach to Improve Low-Fidelity Predictions for a Compound Helicopter.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16707
- Malcipa, Carlos, William A. Decker, Colin R. Theodore, Christopher L. Blanken, and Tom Berger. 2010. “An Investigation of Large Tilt-Rotor Short-Term Attitude Response Handling Qualities Requirements in Hover.” In AHS 66th Annual Forum and Technology Display. https://ntrs.nasa.gov/citations/20100026614
- Mallen, Joseph, and Paul Dancik. 1959. “The Tilt-Wing Propeller VTOL Aircraft Present Status and Future Role.” Journal of the American Helicopter Society 4 (1): 15–19. https://doi.org/10.4050/jahs.4.15
- Malpica, Carlos. 2017a. “Parametric Investigation on the Use of Lateral and Logitudinal Rotor Trim Flapping for Tiltrotor Noise Reduction.” In AHS International Annual Forum & Technology Display. https://ntrs.nasa.gov/citations/20170004551
- Malpica, Carlos A. 2017b. “Parametric Investigation on the Use of Lateral and Longitudinal Rotor Trim Flapping for Tiltrotor Noise Reduction.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12287
- Malpica, Carlos A., William A. Decker, Colin R. Theodore, James E. Lindsey, Ben Lawrence, and Chris L. Blanken. 2011. “An Investigation of Large Tilt-Rotor Hover and Low Speed Handling Qualities.” In American Helicopter Society 67th Annual Forum. https://ntrs.nasa.gov/citations/20110014345
- Malpica, Carlos, Colin R. Theodore, Ben Lawrence, and Chris L. Blanken. 2015. Handling Qualities of Large Rotorcraft in Hover and Low Speed. NASA/TP-2015-216656. NASA. https://ntrs.nasa.gov/citations/20150006816
- Malpica, Carlos A., Colin Theodore, Ben Lawrence, James Lindsey, and Chris L. Blanken. 2012. Handling Qualities of a Large Civil Tiltrotor in Hover Using Translational Rate Command. https://doi.org/10.4050/vfs-f68-000277
- Management, Hm-1R Rotorcraft Integrated Vehicle Health. 2020. A Guide to Extending Times between Overhaul for Rotorcraft Power Train Transmissions Using Monitoring Data. https://doi.org/10.4271/air6334
- Mao, ziyang, chun Shi, and linlin Qin. 2026. “Coordinated Fault-Tolerant MPC via Disturbance Feedforward and Dynamic Thrust Allocation for Transition Flight of over-Actuated Tilt-Rotor UAM Aircraft.” Preprint, . https://doi.org/10.2139/ssrn.7149942
- Marano, Aniello Daniele, Giuseppe Maurizio Gagliardi, Mario Miano, Marika Belardo, and Francesco Marulo. 2024. “Vibration Testing of the Next Generation Civil Tiltrotor Technological Demonstrator Composite Wing.” In Lecture Notes in Mechanical Engineering. Springer Nature Switzerland. https://doi.org/10.1007/978-3-031-77697-7_23
- Marchese, A. J. 1963. X-22A Tri-Service V/STOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0442887
- Marchini, Brian Decimo. n.d. “Adaptive Control Techniques for Transition-to-Hover Flight of Fixed-Wing UAVs.” PhD diss., California Polytechnic State University. https://doi.org/10.15368/theses.2013.191
- Marcolini, Michael A., Casey L. Burley, David A. Conner, and Cecil W. Acree. 1996. “Overview of Noise Reduction Technology in the NASA Short Haul (Civil Tiltrotor) Program.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/962273
- Margason, R. J. 1970. Review of Propulsion-Induced Effects on Aerodynamics of Jet V/STOL Aircraft. NASA-TN-D-5617. NASA. https://ntrs.nasa.gov/citations/19700008938
- Margason, R. J. 1982. “Jet V/STOL Wind-Tunnel Simulation and Groundplane Effects.” In AGARD Fluid Dyn. of Jets with Appl. to V(STOL. https://ntrs.nasa.gov/citations/19820015291
- Margason, Richard. 2002. “Comparison of Five STOL Concepts for Runway Independent Aircraft.” In 2002 Biennial International Powered Lift Conference and Exhibit. AIAA 2002-6025. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-6025
- Marinus, Benoit. 2012. “Comparative Study of the Effects of Sweep and Humps on High-Speed Propeller Blades.” In 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference). AIAA 2012-2219. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2012-2219
- Marinus, Benoit, Michel Roger, René Van den Braembussche, and Walter Bosschaerts. 2009. “Truncated Method for Propeller Noise Prediction up to Low Supersonic Helical Tip Mach Numbers.” In 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference). AIAA 2009-3330. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2009-3330
- Mark, L., and J. Dehart. 1976. “High Speed Aerodynamic Design of an Innovative V/STOL Canard-Wing Configuration.” In Aircraft Systems and Technology Meeting. AIAA 1976-910. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1976-910
- Marks, Marvin. 1956. “Flight Test Development XV-I Convertiplane.” In Proceedings of the American Helicopter Society Western Forum, Dallas, Texas 1956. The Vertical Flight Society. https://doi.org/10.4050/sm_wf_1956-2795
- Marks, Marvin D. 1957. “Flight Test Development of XV-1 Convertiplane.” Journal of the American Helicopter Society 2 (1): 55–65. https://doi.org/10.4050/jahs.2.55
- Marr, R. L. 1976. Wind Tunnel Test Results of 25 Foot Tilt Rotor during Autorotation. NASA-CR-137824. NASA. https://ntrs.nasa.gov/citations/19760021102
- Marr, R. L., D. G. Ford, and S. W. Ferguson. 1974. Analysis of the Wind Tunnel Test of a Tilt Rotor Power Force Model. NASA-CR-137529. NASA. https://ntrs.nasa.gov/citations/19760011019
- Marr, Roger, and Gordon Neal. 1972. Assessment of Model Testing of a Tilt-Proprotor VTOL Aircraft. https://doi.org/10.4050/sm_vstol_1972-1839
- Marr, Roger L., and W. E. B. Roderick. 1974a. “Handling Qualities Evaluation of the XV-15 Tilt Rotor Aircraft.” In Proceedings of the Vertical Flight Society Forum 30 - Washington, D.C. 1974. The Vertical Flight Society. https://doi.org/10.4050/vfs-f30-023
- Marr, Roger L., and W. E. B. Roderick. 1974b. “Handling Qualities Evaluation of the XV-15 Tilt Rotor Aircraft.” Journal of the American Helicopter Society 20 (2): 1–14. https://doi.org/10.4050/jahs.20.23
- Marr, R. L., K. W. Sambell, and G. T. Neal. 1973. V/STOL Tilt Rotor Study. Volume 6: Hover, Low Speed and Conversion Tests of a Tilt Rotor Aeroelastic Model (Model 300). NASA-CR-114615. NASA. https://ntrs.nasa.gov/citations/19730022218
- Marr, Roger L., Jane Willis, and G. B. Churchill. 1976. “Flight Control System Development for the XV-15 Tilt Rotor Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f32-0027
- Marsh, K. R. 1967. Additional Studies on the Feasibility of V/STOL Concepts for Short-Haul Transport Aircraft. NASA-CR-670/01/. NASA. https://ntrs.nasa.gov/citations/19680001706
- Martin, J. 1963a. “The Aerodynamic Approach to Improve Flying Qualities of Tilt-Wing Aircraft.” In 9th Anglo-American Aeronautical Conference. AIAA 1963-484. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1963-484
- Martin, J. 1963b. “Investigation of Longitudinal Handling Qualities Requirements and the Development of Piloting Techniques for Tilt-Wing V/STOL Aircraft in Normal and Emergency Conditions.” In Heterogeneous Combustion Conference. AIAA 1963-1016. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1963-1016
- Martin, Preston, Mahendra Bhagwat, and J. Leishman. 1999. “Visualization of a Helicopter Rotor Wake in Hover.” In 17th Applied Aerodynamics Conference. AIAA 1999-3225. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1999-3225
- Martin, Stanley, and Richard Ostlund. 1989. “V-22 Osprey Developmental Status.” In Aircraft Design and Operations Meeting. AIAA 1989-2113. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2113
- Marvakov, Valentin A., and Florian Holzapfel. 2021. “Defining Robust Transition and Re-Transition Procedures for Unmanned Fixed-Wing VTOL Aircraft.” In AIAA Scitech 2021 Forum. AIAA 2021-1634. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-1634
- Masarati, Pierangelo, Giuseppe Quaranta, Massimiliano Lanz, and Paolo Mantegazza. 2003. “Dynamic Characterization and Stability of a Large Size Multibody Tiltrotor Model by POD Analysis.” In Volume 5: 19th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C. ASMEDC. https://doi.org/10.1115/detc2003/vib-48440
- Masarati, Pierangelo, Giuseppe Quaranta, David J. Piatak, and Jeffrey D. Singleton. 2004. “Further Results of Soft-Inplane Tiltrotor Aeromechanics Investigation Using Two Multibody Analyses.” In AHS International 60th Annual Forum. https://ntrs.nasa.gov/citations/20040111408
- Masse, Eric. 2015. Next Generations of Turboshaft Engines. https://doi.org/10.4050/sm_prop_2015-3600
- Mathur, Tanmay, Ed Smith, and R. C. Bill. 2019. Development of the Pericyclic Drive from Concept to Prototype: A Path towards Rotorcraft Transmission Weight and Noise Reduction. https://doi.org/10.4050/sm_2019_prop-965
- Matsuo, Yuichi, Chuichi Arakawa, Shigeru Saito, and Hiroshi Kobayashi. 1988. “Navier-Stokes Computations for Flowfield of an Advanced Turboprop.” In 24th Joint Propulsion Conference. AIAA 1988-3094. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-3094
- Mattaboni, M., P. Masarati, and P. Mantegazza. 2011. “Multibody Simulation of a Generalized Predictive Controller for Tiltrotor Active Aeroelastic Control.” Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 226 (2): 197–216. https://doi.org/10.1177/0954410011406203
- Matthys, Carl G., and E. E. Scroggs. 1984. Technology Impact on Helicopter, Tilt Rotor, and Tilt Fold Rotor Concepts. https://doi.org/10.4050/vfs-f40-1158
- Matuska, David, Allen Dale, and Peter Lorber. 1994. Wind Tunnel Test of a Variable-Diameter Tiltrotor (VDTR) Model. NASA-CR-177629. NASA. https://ntrs.nasa.gov/citations/19940020323
- Maurya, Shashank, Inderjit Chopra, and Anubhav Datta. 2021a. “In Search of Extreme Limits of a Compound Helicopter in High Speed Flight.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16763
- Maurya, Shashank, Inderjit Chopra, and Xing Wang. 2020. “Wind Tunnel Test on a Slowed Mach-Scaled Hingeless Rotor with Lift Compounding.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0076-2020-16439
- Maurya, Shashank, Xing Wang, and Inderjit Chopra. 2021b. “Wind Tunnel Test on a Slowed Mach-Scaled Hingeless Rotor with Lift Compounding.” Journal of the American Helicopter Society. https://doi.org/10.4050/jahs.66.042005
- Mavris, Dimitri, Jimmy Tai, and Daniel Schrage. 1994. “A Multidisciplinary Design Optimization Approach to Sizing Stopped Rotor Configurations Utilizing Reaction Drive and Circulation Control.” In 5th Symposium on Multidisciplinary Analysis and Optimization. AIAA 1994-4296. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1994-4296
- May, Marc S., Daniel Milz, and Sophie F. Armanini. 2026b. “Transition Corridor Estimation for a Tilt-Wing Aircraft \\ with Optimal Control-Based Reachability Analysis.” In AIAA SCITECH 2026 Forum. AIAA 2026-2068. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-2068
- May, Marc S., Daniel Milz, and Gertjan Looye. 2024a. “Towards the Determination of the Dynamic Transition Corridor for Tandem Tilt-Wing Aircraft.” In AIAA Aviation Forum and Ascend 2024. AIAA 2024-4417. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-4417
- May, Marc S., Daniel Milz, and Gertjan Looye. 2024b. “Transition Strategies for Tilt-Wing Aircraft.” In AIAA SCITECH 2024 Forum. AIAA 2024-1289. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1289
- Mayer, Robert, and Robert Wozniak. 2006. “Scale Model Fuel Dump Wind Tunnel Test for a Tiltrotor Aircraft.” In 44th AIAA Aerospace Sciences Meeting and Exhibit. AIAA 2006-1128. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-1128
- Mazzitelli, F. R. 1957. “The Tilt: Wing VTOL Aircraft as a Commercial Air Transport.” In SAE Technical Paper Series, vol. 1. SAE International. https://doi.org/10.4271/570357
- McAlister, Kenneth. 1996. “Measurements in the near Wake of a Hovering Rotor.” In Fluid Dynamics Conference. AIAA 1996-1958. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1996-1958
- McAninch, G., and J. Rawls Jr. 1984. “Effects of Boundary Layer Refraction and Fuselage Scattering on Fuselage Surface Noise from Advanced Turboprop Propellers.” In 22nd Aerospace Sciences Meeting. AIAA 1984-249. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-249
- McArdle, Jack G. 1986. Outdoor Test Stand Performance of a Convertible Engine with Variable Inlet Guide Vanes for Advanced Rotorcraft Propulsion. NASA-TM-88939. NASA. https://ntrs.nasa.gov/citations/19870007392
- McArdle, Jack G. 1987. “Test Stand Performance of a Convertible Engine for Advanced V/STOL and Rotorcraft Propulsion.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/872355
- McArdle, Jack G. 1988a. The Convertible Engine: A Dual-Mode Propulsion System. NASA Lewis Research Center. https://ntrs.nasa.gov/citations/19880007256
- McArdle, Jack G. 1988b. “Test Stand Performance of a Convertible Engine for Advanced V/STOL and Rotorcraft Propulsion.” In International Powered Lift Conference and Exposition. https://ntrs.nasa.gov/citations/19880049990
- McArdle, Jack G., Richard L. Barth, Leon M. Wenzel, and Thomas J. Biesiadny. 1996. Dynamic and Transient Performance of Turbofan/Turboshaft Convertible Engine with Variable Inlet Guide Vanes. NASA-TM-4696. NASA. https://ntrs.nasa.gov/citations/19960022775
- McArdle, J. G., and L. M. Wenzel. 1981. “Experimental Program for the Evaluation of Turbofan/turboshaft c Conversion Technology.” In Rotary Wing Propulsion System Specialist Meeting. https://ntrs.nasa.gov/citations/19830002860
- McArdle, Jack G., and L. M. Wenzel. 1982. Experimental Program for the Evaluation of Turbofan/Turboshaft Conversion Technology. https://doi.org/10.4050/sm_prop_1982-2688
- McCarthy, Thomas Robert. 1996. A New Higher-Order Composite Theory for Analysis and Design of High Speed Tilt-Rotor Blades. NASA-CR-196703. NASA. https://ntrs.nasa.gov/citations/19970001800
- McCarthy, Thomas R., and Aditi Chattopadhyay. 1996. “A Coupled Rotor/Wing Optimization Procedure for High Speed Tilt-Rotor Aircraft.” Journal of the American Helicopter Society 41 (4): 360–69. https://doi.org/10.4050/jahs.41.360
- McCluer, Megan S., Jeffrey L. Johnson, and Michael Rutkowski. 2001. Full-Span Tiltrotor Aeroacoustic Model (TRAM) Overview and 40- by 80-Foot Wind Tunnel Test. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20020048274
- McCormick, B. W. 1976. “On the Status of V/STOL Flight.” In NASA. Langley Res. Center Advan. in Eng. Sci., Vol. 4. https://ntrs.nasa.gov/citations/19770003425
- McCormick, B. W., and Joseph Mallen. 1957. “Design Considerations for Tilt-Wing Type VTOL Aircraft.” Journal of the American Helicopter Society 2 (3): 49–55. https://doi.org/10.4050/jahs.2.49
- McCormick, B. W., Jr. 1956. Comparative Study of Various Types of VTOL Transport Aircraft Transition Analysis of the Vertodyne. Defense Technical Information Center. https://doi.org/10.21236/ad0159429
- McCormick, B. W., Jr., and Joseph Mallen. 1956. “Design Considerations for Tilt Wing Type VTOL Aircraft.” In Proceedings of the American Helicopter Society Western Forum, Dallas, Texas 1956. The Vertical Flight Society. https://doi.org/10.4050/sm_wf_1956-2299
- McCroskey, W. J., P. R. Spalart, G. H. Laub, M. D. Maisel, and B. Maskew. 1983. “Airloads on Bluff Bodies, with Application to the Rotor-Induced Downloads on Tilt-Rotor Aircraft.” In European Rotorcraft Forum. https://ntrs.nasa.gov/citations/19840003074
- McCroskey, W. J., Ph. Spalart, G. H. Laub, M. D. Maisel, and B. Maskew. 1985. “Airloads on Bluff Bodies, with Application to the Rotor-Induced Downloads on Tilt-Rotor Aircraft.” Vertica 9 (1, 19). https://ntrs.nasa.gov/citations/19850051318
- McCurdy, David A. 1983. “Annoyance to Advanced Turboprop Aircraft Flyover Noise.” Journal of the Acoustical Society of America 74 (S1): S112-S112. https://doi.org/10.1121/1.2020749
- McCurdy, D. 1984. “Quantification of Advanced Turboprop Aircraft Flyover Noise Annoyance.” In 9th Aeroacoustics Conference. AIAA 1984-2293. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-2293
- McCurdy, David A. 1985. “Comparison of Advanced Turboprop and Conventional Jet and Propeller Aircraft Flyover Noise Annoyance.” Journal of the Acoustical Society of America 78 (S1): S32-S32. https://doi.org/10.1121/1.2022756
- McCurdy, David A. 1988. “Advanced Turboprop Aircraft Flyover Noise: Annoyance to Counter-Rotating-Propeller Configurations.” Journal of the Acoustical Society of America 83 (S1): S114-S114. https://doi.org/10.1121/1.2025159
- McCurdy, David. 1989. “Advanced Turboprop Aircraft Flyover Noise Annoyance: Comparison of Different Propeller Configurations.” In 12th Aeroacoustic Conference. AIAA 1989-1128. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-1128
- McCurdy, D., J. Leatherwood, and K. Shepherd. 1986. “Advanced Turboprop Aircraft Noise Annoyance: A Review of Recent NASA Research.” In 10th Aeroacoustics Conference. AIAA 1986-1959. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-1959
- McElreath, K. W. 1972. True Airspeed Sensor for V/STOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0755374
- McIntire, W. L., and Donald S. Monson. 1970. “Optimization Study for VTOL Aircraft Powerplants.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f26-031
- McIntyre, Walter. 1963. Simulation of Helicopter and V/STOL Aircraft. Volume II. V/STOL Analysis Report. Study, Equations of Motion of Vertical/short Take-off and Landing Operational Flight/weapon System Trainers. Defense Technical Information Center. https://doi.org/10.21236/ad0602427
- McKechnie, M., and G. Barakos. 2025. “Aeroelastic Analysis of Propeller Blades at Stall Flutter Onset.” Aeronautical Journal 129 (1342): 3446–66. https://doi.org/10.1017/aer.2025.10060
- McKenzie, A. B., and B. T. Bayne. 1976. “Performance Development of the Gem Turboshaft Engine.” Journal of Engineering for Power 98 (1): 114–22. https://doi.org/10.1115/1.3446101
- McKinney, M. O., and W. A. Newsom. 1962. Experimental Research on 4-Duct Tandem VTOL Aircraft Configurations. No Number:. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19620001441
- McKinney, M. O., and W. A. Newsom. 1967. Fan V/STOL Aircraft. NASA-TM-X-59739. NASA. https://ntrs.nasa.gov/citations/19680015806
- McKinney, M. O., and W. A. Newsom. 1968. Fan V/STOL Aircraft. NASA. https://ntrs.nasa.gov/citations/19690037576
- McKinney, M. O., Jr., W. A. Newsom Jr., and L. P. Parlett. 1966. An Approach to Efficient Low-Speed Flight for Fan-Powered V/STOL Aircraft. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19660015327
- McLean, D., and M. A. Naseem. 1977. “Simple Sub-Optimal On/Off Flight Controller for a VTOL Aircraft.” Measurement and Control 10 (11): 441–45. https://doi.org/10.1177/002029407701001103
- McNally, B. David, and Ralph E. Bach Jr. 1988. “Flight Testing a V/STOL Aircraft to Identify a Full-Envelope Aerodynamic Model.” In AIAA Flight Test Conference. https://ntrs.nasa.gov/citations/19880051504
- McVeigh, M. A. 1976. Preliminary Simulation of an Advanced, Hingless Rotor XV-15 Tilt-Rotor Aircraft. NASA-CR-151950. NASA. https://ntrs.nasa.gov/citations/19770016151
- McVeigh, Michael A., William K. Grauer, and David J. Paisley. 1990. “Rotor/Airframe Interactions on Tiltrotor Aircraft.” Journal of the American Helicopter Society 35 (3): 43–51. https://doi.org/10.4050/jahs.35.43
- McVeigh, M. A., J. Liu, S. J. O’Toole, and S. Woods. 1997. “V-22 Osprey Aerodynamic Development — A Progress Review.” Aeronautical Journal 101 (1006): 231–44. https://doi.org/10.1017/s0001924000066264
- McVeigh, H. Nagib, T. L. Wood, John W. Kiedaisch, A. Stalker, and I. Wygnanski. 2004. Model & Full Scale Tiltrotor Download Reduction Tests Using Active Flow Control. https://doi.org/10.4050/vfs-f60-000002
- McVeigh, Michael A., Harold J. Rosenstein, and Francis J. McHugh. 1983. “Aerodynamic Design of the XV-15 Advanced Composite Tilt Rotor Blade.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f39-006
- Meakin, Robert. 1993. “Moving Body Overset Grid Methods for Complete Aircraft Tiltrotor Simulations.” In 11th Computational Fluid Dynamics Conference. AIAA 1993-3350. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-3350
- Meakin, Robert. 1995. “Unsteady Simulation of the Viscous Flow about a V-22 Rotor and Wing in Hover.” In 20th Atmospheric Flight Mechanics Conference. AIAA 1995-3463. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1995-3463
- Meakin, Robert L. 1996a. Global Flowfield about the V-22 Tiltrotor Aircraft. NASA-CR-200828. NASA. https://ntrs.nasa.gov/citations/19960050497
- Meakin, Robert L. 1996b. Unsteady Simulation of the Viscous Flow about a V-22 Rotor and Wing in Hover. AIAA Paper 95-3463. Overset Methods, Inc. https://ntrs.nasa.gov/citations/19960050499
- Mehmed, O., K. R. V. Kaza, J. F. Lubomski, and R. E. Kielb. 1981. “Bending-Torsion Flutter of a Highly Swept Advanced Turboprop.” In 1982 Aerospace Congr. and Exposition. https://ntrs.nasa.gov/citations/19830003244
- Mehmed, Oral, and Anatole Kurkov. 1993. “Experimental Investigation of Counter-Rotating Propfan Flutter at Cruise Conditions.” In 34th Structures, Structural Dynamics and Materials Conference. AIAA 1993-1632. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-1632
- Mehmed, Oral, and Durbha Murthy. 1988. “Experimental Investigation of Propfan Aeroelastic Response in off-Axis Flow with Mistuning.” In 24th Joint Propulsion Conference. AIAA 1988-3153. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-3153
- Mehra, R., M. Wasikowski, R. Prasanth, R. Bennett, and D. Neckels. 2001. “Model Predictive Control Design for XV-15 Tilt Rotor Flight Control.” In AIAA Guidance, Navigation, and Control Conference and Exhibit. AIAA 2001-4331. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2001-4331
- Meitner, Peter L., Anthony L. Laganelli, Paul F. Senick, and William E. Lear. 2000. “Demonstration of a Semi-Closed Cycle, Turboshaft Gas Turbine Engine.” In Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/2000-gt-0535
- Melake, A. 1992. “Numerical Flow Simulation and Analysis of a Shrouded Propfan Rotor.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3773. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3773
- Melo, César Abrahão Pereira. n.d. “Aerodynamic Noise in Distributed Electric Propulsion Rotor-Wing Systems Investigated Using Experimental and Numerical Methods.” PhD diss., Universidade de São Paulo. https://doi.org/10.11606/t.18.2026.tde-07052026-101521
- Merret, Jason, and Michael Bragg. 2003. “X-38 Aerodynamics during Rapid Pitch Up.” In 21st AIAA Applied Aerodynamics Conference. AIAA 2003-3526. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-3526
- Merrill, R. K., and G. W. Hall. 1982. Flight Testing the Rotor Systems Research Aircraft (RSRA). U.S. Army, Aviation Engineering Flight Activity, Edwards AFB. https://ntrs.nasa.gov/citations/19840033210
- Mesec, Gilbert. 2014. “Vertical Lift Aircraft Rotor and Blade Mechanical and Dynamic Fault Detection in the Field through the Use of Revolution to Revolution Blade Track Data Analysis.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0070-2014-9534
- Meuleners, R. J. 1981. XV-15 Tilt Rotor Fly-by-Wire Collective Control Demonstrator Development Specifications. NASA-CR-166262. NASA. https://ntrs.nasa.gov/citations/19820007157
- Meyer, Michael A., and Gareth D. Padfield. 2002. “First Steps in the Development of Handling Qualities Criteria for a Civil Tiltrotor.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f58-00067
- Meza, Víctor Gabriel Sánchez, Alberto Luviano-Juárez, Yair Lozano-Hernández, and Jaime González-Sierra. 2024. “Estudio del desarrollo de las aeronaves tilt-rotor.” Científica 28 (2): 1–13. https://doi.org/10.46842/ipn.cien.v28n2a07
- Miao, Muyao, Da Cui, and Daokui Li. 2026. “Closed-Form Analytical Modeling and Optimal Design of Extension-Twist Coupled Composite Box Beams for Tiltrotor Morphing Blades.” Preprint, . https://doi.org/10.2139/ssrn.7274284
- Michaels, Jerome L. 1969. Study and Evaluation of V/Stol Ground-Based Simulation Techniques for the X-22A Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0859290
- Michaelsen, O. 1971. “A Comparison of Outflows from a Helicopter, Tilt Wing and Jet Lift Hovering Aircraft.” In 8th Annual Meeting and Technical Display. AIAA 1971-992. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1971-992
- Michalek, Joseph K. 2012. The Need for the Next Special Operations Forces’ Mobility Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ada562545
- Migdal, David. 1973. “Effect of Exhaust Deflectors on the Design of Lift Plus Lift/Cruise V/STOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/730959
- Mihalčová, Janka. 2018. “State of Aircraft Turboshaft Engines by Means of Tribotechnical Diagnostic.” International Journal of Turbo & Jet-Engines 35 (1): 11–16. https://doi.org/10.1515/tjj-2016-0035
- Millar, D. A. J., M. S. Chappell, and R. Okelah. 1979. “The Co-Turboshaft: A Novel Gas Turbine Powerplant for Heavy Equipment.” In Volume 1B: Gas Turbines. American Society of Mechanical Engineers. https://doi.org/10.1115/79-gt-132
- Miller, R. 1982. “Rotor Hovering Performance Using the Method of Fast Free Wake Analysis.” In 20th Aerospace Sciences Meeting. AIAA 1982-94. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1982-94
- Miller, Christopher. 1988. “Euler Analysis of a Swirl Recovery Vane Design for Use with an Advanced Single-Rotation Propfan.” In 24th Joint Propulsion Conference. AIAA 1988-3152. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-3152
- Miller, David G., and Norman D. Ham. 1988. Active Control of Tiltrotor Blade in-Plane Loads during Maneuvers. Boeing Helicopters. https://ntrs.nasa.gov/citations/19900055408
- Miller, Christopher, and Gary Podboy. 1990. “Euler Analysis Comparison with LDV Data for an Advanced Counter-Rotation Propfan at Cruise.” In Flight Simulation Technologies Conference and Exhibit. AIAA 1990-3033. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3033
- Miller, R. J., S. P. Roth, and W. B. Kerr. 1981. “NASA V/STOL Propulsion Control Analysis: Phase I and II Program Status.” In V/STOL Conference. https://ntrs.nasa.gov/citations/19820033373
- Miller, Kia, and Roger Truax. 2018. “X-57 and Whirl Flutter Discussion.” In Aerospace Flutter and Dynamics Council 2018. https://ntrs.nasa.gov/citations/20180002829
- Mills, John B. 1988. Navy Combat SAR (Combat Search and Rescue): Past, Present, and Future?. Defense Technical Information Center. https://doi.org/10.21236/ada207002
- Milluzzo, Joseph I., and J. Gordon Leishman. 2010. “Assessment of Rotorcraft Brownout Severity in Terms of Rotor Design Parameters.” Journal of the American Helicopter Society 55 (3): 32009–320099. https://doi.org/10.4050/jahs.55.032009
- Milz, Daniel, and Gertjan Looye. 2022. “Tilt-Wing Control Design for a Unified Control Concept.” In AIAA SCITECH 2022 Forum. AIAA 2022-1084. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-1084
- Min, Byoung-Mun, Min-Jea Tahk, Byoung-Soo Kim, and Hyo-Sang Shin. 2005. “Guidance Law for Automatic Landing of Tilt-Rotor Aircraft.” In AIAA Guidance, Navigation, and Control Conference and Exhibit. AIAA 2005-6353. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2005-6353
- Min, Byung-Young, and Brian Wake. 2015. “Analysis of a Hovering Rotor Using UT-GENCAS: A Modified Hybrid Navier-Stokes/Free-Wake Method.” In 53rd AIAA Aerospace Sciences Meeting. AIAA 2015-1247. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1247
- Min, Byung-Young, Brian E. Wake, and Rohit Jain. 2026. “An Investigation of CFD Predictions for Rotor Hover Performance near Stall Conditions.” In AIAA SCITECH 2026 Forum. AIAA 2026-1509. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-1509
- Mineck, R. E. 1977. Effect of Rotor Wake on Aerodynamic Characteristics of a 1/6 Scale Model of the Rotor Systems Research Aircraft. NASA-TM-X-3548. NASA. https://ntrs.nasa.gov/citations/19770025139
- Mineck, R. E., and C. E. Freeman. 1977a. Aerodynamic Characteristics of a 1/6-Scale Powered Model of the Rotor Systems Research Aircraft. NASA-TM-X-3489. NASA. https://ntrs.nasa.gov/citations/19770021146
- Mineck, R. E., and C. E. Freeman. 1977b. Airframe, Wing, and Tail Aerodynamic Characteristics of a 1/6-Scale Model of the Rotor Systems Research Aircraft with the Rotors Removed. NASA-TN-D-8456. NASA. https://ntrs.nasa.gov/citations/19770019138
- Minervino, Mauro, Pier Luigi Vitagliano, and Domenico Quagliarella. 2016. “Helicopter Stabilizer Optimization Considering Rotor Downwash in Forward-Flight.” Aircraft Engineering and Aerospace Technology 88 (6): 846–65. https://doi.org/10.1108/aeat-03-2015-0082
- Mishra, Aashutosh A., and Imon Chakraborty. 2024a. “Flight Dynamics and Control Integration in Conceptual Design of an Advanced Air Mobility VTOL Aircraft.” In AIAA Aviation Forum and Ascend 2024. AIAA 2024-4050. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-4050
- Mishra, Aashutosh A., and Imon Chakraborty. 2024b. “Integrating Stability and Control Considerations into the Sizing of an Advanced Air Mobility VTOL Aircraft.” In AIAA SCITECH 2024 Forum. AIAA 2024-2316. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-2316
- Misté, Gianluigi Alberto, and Ernesto Benini. 2012. “Performance of a Turboshaft Engine for Helicopter Applications Operating at Variable Shaft Speed.” In ASME 2012 Gas Turbine India Conference. American Society of Mechanical Engineers. https://doi.org/10.1115/gtindia2012-9505
- Mitchell, Jonathan. 2007. “Suppressing Vibrations in the BA609 Tiltrotor: Flight Testing an Innovative Solution.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f63-000183
- Mitchell, D., and R. Hoh. 1985. “Development of Time Response Criteria for Rotorcraft at Hover and Low Speed.” In 12th Atmospheric Flight Mechanics Conference. AIAA 1985-1790. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-1790
- Mitchell, G., and D. Mikkelson. 1982. “Summary and Recent Results from the NASA Advanced High-Speed Propeller Research Program.” In 18th Joint Propulsion Conference. AIAA 1982-1119. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1982-1119
- Mitchell, Clark, and Barbara Vogel. 2003. “The Canard Rotor Wing (CRW) Aircraft: A New Way to Fly.” In AIAA International Air and Space Symposium and Exposition: The Next 100 Years. AIAA 2003-2517. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-2517
- Miyamoto, Naoyuki, Takateru Urakubo, and Takanori Fukao. 2012. “2A1-H11 Attitude Stabilization of Tiltrotor Aerial Robot in Hover Flight(Aerial Robot and Mechatronics(1)).” Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2012 (0): _2A1-H11_1-_2A1-H11_2. https://doi.org/10.1299/jsmermd.2012._2a1-h11_1
- Mobley, Forrest, Jared Carnes, and James G. Coder. 2021. “Modal Decomposition Analysis of Hovering Rotor Wake Breakdown.” In AIAA Scitech 2021 Forum. AIAA 2021-0737. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-0737
- “Model Predictive Control of Nonlinear Rotorcraft Dynamics with Application to the XV-15 Tilt Rotor.” 2004. In Advances in Dynamics and Control. CRC Press. https://doi.org/10.1201/9780203298916-9
- Modeling, A-21 Aircraft Noise Measurement Aviation Emission. 1985. Standard Indoor Method of Collection and Presentation of the Bare Turboshaft Engine Noise Data for Use in Helicopter Installations. https://doi.org/10.4271/arp1279
- Moffitt, Blake A., Patrick Bowles, Jongwook Joo, Byung-Young Min, and Brian Wake. 2017. “Analysis and Testing of Boundary-Layer-Ingesting Pusher Propeller for High Speed Rotorcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12012
- Mohd Ali, Zurriati, Muhammad Izzat Izzudin Jefri, and Zulhilmy Sahwee. 2023. “Design, Build and Fly the Uitm’s Vertical Take-off and Landing (VTOL) Aircraft.” Malaysian Journal of Computing 8 (1): 1301–10. https://doi.org/10.24191/mjoc.v8i1.20100
- Mohd Zawawi, Fazila. n.d. “Aeroelastic Analysis of Flexible Composite Proprotor Blades for Convertible Micro Air Vehicles.” PhD diss., Toulouse, ISAE. https://doi.org/10.70675/0f7535c5z3485z4b0fzaef4z6f5f3d473383
- Moller, P. 1985. “The Integration of a New Concept in VTOL Aircraft Propulsion.” In 21st Joint Propulsion Conference. AIAA 1985-1448. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-1448
- Moller, James, Jonathan Litt, and Ten-Huei Guo. 1998. “Neural Network-Based Sensor Validation for Turboshaft Engines.” In 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. AIAA 1998-3605. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1998-3605
- Monahova, Afanasev V. A. Goncharov V. V. V. P. 2022. “Metrological Support Features during Certification Tests of a Turboshaft Propeller Aircraft Engine.” Vestnik Mashinostroeniya: 3–7. https://doi.org/10.36652/0042-4633-2022-12-3-7
- Monnier, Bruno P., and Brandon L. Litherland. 2026. Neural Net Estimation of Thrust Measurements for the Tilt Wing Test Rig. National Aeronautics and Space Administration. https://doi.org/10.64631/fvgp5767
- Moodie, Alex M., and Hyeonsoo Yeo. 2011. Design of a Cruise Efficient Compound Helicopter. https://doi.org/10.4050/vfs-f67-000165
- Moodie, Alex M., and Hyeonsoo Yeo. 2012. “Design of a Cruise-Efficient Compound Helicopter.” Journal of the American Helicopter Society 57 (3): 1–11. https://doi.org/10.4050/jahs.57.032004
- Moore, Mark. 2010. “NASA Puffin Electric Tailsitter VTOL Concept.” In 10th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference. AIAA 2010-9345. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2010-9345
- Morino, L., G. Bernardini, and M. Gennaretti. 2000. “Integrated Aerodynamic/aeroacoustic Analysis of a Tiltrotor during Conversion.” In 6th Aeroacoustics Conference and Exhibit. AIAA 2000-2028. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2000-2028
- Morizawa, Seiichiro, Taku Nonomura, Shigeru Obayashi, Akira Oyama, and Kozo Fujii. 2016. “Multiobjective Design Exploration of Propeller Airfoils at Low-Reynolds and High-Mach Number Conditions towards Mars Airplane.” Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan 14 (ists30): Pk_47-Pk_53. https://doi.org/10.2322/tastj.14.pk_47
- Morlok, Edward K., and David L. Schoendorfer. 1985. A Strategy for Advancing Tilt-Rotor Technology. NASA-CR-181420. NASA. https://ntrs.nasa.gov/citations/19870020067
- Morris, William B. 1962. “All Mechanical Primary Flight Control System for VTOL/STOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/620481
- Morris, James J., and Harold R. Alexander. 1978. “Definition and Analytical Evaluation of a Power Management System for Tilt-Rotor Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f34-044
- Mortimer, Patrick C., Chloe Johnson, Jayant Sirohi, Stefan Platzer, and Juergen Rauleder. 2020. “Experimental and Numerical Investigation of a Variable-Speed Rotor for Thrust Control.” In AIAA Aviation 2020 Forum. AIAA 2020-2791. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-2791
- Mosher, M. 1983. Acoustic Measurements of the X-Wing Rotor. NASA-TM-84292. NASA. https://ntrs.nasa.gov/citations/19830020714
- Mosher, Marianne, and Jeffrey S. Light. 1994. Study of Noise on a Small-Scale Hovering Tilt Rotor. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19950028591
- Moushegian, Alex M., Andrew Bodling, Eric Hayden, and David Farish. 2024. “Investigation of Modeling Approaches to High-Fidelity Computational Predictions of Tiltrotor Hover Aeromechanics.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1089
- Mrusek, Bettina. 2021. “Vertical Takeoff and Landing (VTOL) Small Unmanned Aircraft Systems (sUAS).” Trends in Technical & Scientific Research 05 (1). https://doi.org/10.19080/ttsr.2021.05.555651
- Muehlbauer, J., and S. Morris. 1981. “Advanced Turboprop Cargo Aircraft Systems Study.” In Aircraft Systems and Technology Conference. AIAA 1981-1684. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-1684
- Mueller, Joerg P., Yves Gourinat, Rogelio Ferrer, Tomasz Krysiński, and Benjamin Kerdreux. 2006. “A Numerical Study on Active Control for Tiltrotor Whirl Flutter Stability Augmentation.” Journal of the American Helicopter Society 51 (3): 244. https://doi.org/10.4050/1.3092885
- Mullarky, J. W. 1990. Combat Search and Rescue – the Cinc’s Dilemma. Defense Technical Information Center. https://doi.org/10.21236/ada222776
- Munter, Lt. Paul L. 1954. “Design and Flight Test of a Two-Speed Helicopter Transmission.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f10-009
- Muraoka, Koji, Noriaki Okada, and Daisuke Kubo. 2009. “Quad Tilt Wing VTOL UAV: Aerodynamic Characteristics and Prototype Flight.” In AIAA Infotech@Aerospace Conference. AIAA 2009-1834. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2009-1834
- Muraoka, Koji, Takaaki Yokoyama, Nobuhiro Yokoyama, and Masayuki Sato. 2024. “Flight Verification of Automatic Flight and Transition System for Lift/Cruise Thrust Type VTOL Aircraft.” Transactions of the Japan Society for Aeronautical and Space Sciences 67 (5): 285–94. https://doi.org/10.2322/tjsass.67.285
- Murphy, Patrick C., and Drew Landman. 2015. “Experiment Design for Complex VTOL Aircraft with Distributed Propulsion and Tilt Wing.” In AIAA Atmospheric Flight Mechanics Conference. AIAA 2015-0017. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-0017
- Murray, Daniel. 1990. “The AVRO VZ-9 Experimental Aircraft: Lessons Learned.” In Aircraft Design, Systems and Operations Conference. AIAA 1990-3237. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3237
- Murugan, Senthil, and Snigdha Lm. 2023. “Data Driven Modeling of Electric Tilt-Rotor Aircraft Dynamics.” In AIAA AVIATION 2023 Forum. AIAA 2023-4130. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-4130
- Muscarello, Vincenzo. 2019. “Investigation of Structural Coupling Problems in Tiltrotor Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14583
- Muscarello, Vincenzo, and Giuseppe Quaranta. 2019. “Optimization of Tiltrotor Blade Twist to Increase Whirl-Flutter Stability.” In AIAA Scitech 2019 Forum. AIAA 2019-1366. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1366
- Muscarello, Vincenzo, and Giuseppe Quaranta. 2021. “Structural Coupling and Whirl-Flutter Stability with Pilot-in-the-Loop.” Journal of the American Helicopter Society 66 (3): 1–16. https://doi.org/10.4050/jahs.66.032003
- Muscarello, Vincenzo, and Giuseppe Quaranta. 2023. “Optimal Tiltrotor Blade Twist to Extend Whirl-Flutter Stability Boundaries.” In AIAA SCITECH 2023 Forum. AIAA 2023-1510. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1510
- Muse, Thomas C. 1961. “VTOL AIRCRAFT.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/610178
- Myers, Leighton, Ryan Czerwiec, and Zachary Napolillo. 2019. “Lift Fan Assessment for Conceptual Design of Aircraft Forebody.” In AIAA Aviation 2019 Forum. AIAA 2019-3478. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-3478
- Nabi, Hafiz Noor, Giuseppe Quaranta, Coen C. de Visser, and Marilena D. Pavel. 2019. “A Quasi-Linear Parameter Varying (qLPV) Approach for Tiltrotor Conversion Modeling and Control Synthesis.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14592
- Nabiyev, R. N. 2024. “On-Board Control-Measurement System for Micro Convertiplane-Type Unmanned Aerial Vehicles.” Eurasian Physical Technical Journal 21 (2(48)): 61–69. https://doi.org/10.31489/2024no2/61-69
- Nabiyev, Rasim, and Anar Abdullayev. 2022. “Results of Measurements Carried out for the Purpose of Determining the Center of Gravity of a Convertiplane-Type UAV.” InterConf, no. 26(129): 197–202. https://doi.org/10.51582/interconf.19-20.10.2022.021
- Nabiyev, Rasim, Anar Abdullayev, and Gadir Garayev. 2025. “Study of the Designed Convertiplane-Type Micro UAV in Stationary and Multicopter Flight Modes with the on-Board Control-Measurement System.” In Sustainable Aviation. Springer Nature Switzerland. https://doi.org/10.1007/978-3-032-07678-6_12
- Nabiyev, R. N., A. T. Hazarkhanov, G. I. Garayev, and A. A. Abdullayev. 2020. “Conceptual Functional Design of Hybrid Energy Source of Unmanned Convertiplane.” IOP Conference Series: Materials Science and Engineering 862 (2): 022043. https://doi.org/10.1088/1757-899x/862/2/022043
- Nadell, Samuel, Christopher DiMarco, Tom Berger, and Mark J. S. Lopez. 2022. “System Identification and Stitched Modeling of the ADAPT™ Winged Compound Helicopter Scaled Demonstrator.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0078-2022-17576
- Nagata, John I., Joe Miess, and Loran A. Haworth. 1983. Preliminary Airworthiness Evaluation of the UH-60 Helicopter with T700- GE-701A Engines Installed. Defense Technical Information Center. https://doi.org/10.21236/ada140882
- Nagy, Christopher J., and Paul W. Kirsten. 1976. Handling Qualities and Stability Derivatives of the X-24B Research Aircraft. Defense Technical Information Center. https://doi.org/10.21236/adb012970
- Naik, Dinesh. 1990. “3-D Euler Calculations for Aft-Propfan Integration.” In 26th Joint Propulsion Conference. AIAA 1990-2147. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-2147
- Nallasamy, M. 1992a. “Unsteady Blade Pressures on a Propfan at Takeoff: Euler Analysis and Flight Data.” In 30th Aerospace Sciences Meeting and Exhibit. AIAA 1992-376. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-376
- Nallasamy, M. 1992b. “Unsteady Blade Pressures on a Propfan: Predicted and Measured Compressibility Effects.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3774. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3774
- Nallasamy, M., B. J. Clark, and J. F. Groeneweg. 1987a. “Euler Analysis of the Three-Dimensional Flow Field of a High-Speed Propeller: Boundary Condition Effects.” Journal of Turbomachinery 109 (3): 332–39. https://doi.org/10.1115/1.3262110
- Nallasamy, M., B. Clark, and J. Groeneweg. 1987b. “High-Speed Propeller Noise Predictions: Effects of Boundary Conditions Used in Blade Loading Calculations.” In 25th AIAA Aerospace Sciences Meeting. AIAA 1987-525. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-525
- Nallasamy, M., R. Woodward, and J. Groeneweg. 1988a. “High Speed Propeller Performance and Noise Predictions at Takeoff/landing Conditions.” In 26th Aerospace Sciences Meeting. AIAA 1988-264. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-264
- Narain, J. 1983. “,A Transonic Analysis of Propfan Slipstream Effect on a Supercritical Wing.” In 21st Aerospace Sciences Meeting. AIAA 1983-186. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-186
- Narducci, Robert, Feng Jiang, John Liu, and Roger Clark. 2009. “CFD Modeling of Tiltrotor Shipboard Aerodynamics with Rotor Wake Interactions.” In 27th AIAA Applied Aerodynamics Conference. AIAA 2009-3857. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2009-3857
- Narramore, J. 1981. “Advanced Technology Airfoil Development for the XV-15 Tilt-Rotor Vehicle.” In AIAA and NASA Ames VSTOL Conference. AIAA 1981-2623. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-2623
- Narramore, J., and R. Vermeland. 1989. “Use of Navier-Stokes Code to Predict Flow Phenomena near Stall as Measured on a 0.658-Scale V-22 Tiltrotor Blade.” In 20th Fluid Dynamics, Plasma Dynamics and Lasers Conference. AIAA 1989-1814. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-1814
- NASA Conference on V/STOL Aircraft: A Compilation of the Papers Presented. 1960. NASA-TM-X-70202. NASA. https://ntrs.nasa.gov/citations/19740076580
- NASA/Army XV-15 Tilt Rotor Research Aircraft Familiarization Document. 1975. NASA-TM-X-62407. NASA. https://ntrs.nasa.gov/citations/19750016648
- NASA/HAA Advanced Rotorcraft Technology and Tilt Rotor Workshop. Volume 5: Propulsion Session. 1980a. NASA-TM-84207. NASA. https://ntrs.nasa.gov/citations/19820015367
- NASA/HAA Advanced Rotorcraft Technology and Tilt Rotor Workshop. Volume 6: Vehicle Configuration Session. 1980b. NASA-TM-84180. NASA. https://ntrs.nasa.gov/citations/19820015368
- NASA/HAA Advanced Rotorcraft Technology and Tilt Rotor Workshop. Volume 7: Tilt Rotor Session. 1980c. NASA-TM-84705. NASA. https://ntrs.nasa.gov/citations/19820015369
- Nasu, Ken-Ichi. 1986. Tilt-Rotor Flutter Control in Cruise Flight. NASA-TM-88315. NASA. https://ntrs.nasa.gov/citations/19870009139
- Natelson, Alex, and Juergen Rauleder. 2026. “Advances in Lattice-Boltzmann Modeling of Proprotor–Wing Aerodynamics: Boundary Conditions and Proprotor Model Comparisons.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0176
- Nawrocki, F. 1989. “Ensuring Surge-Free Engine Operation on Today’s Turbofan Powered Business Jets.” In 25th Joint Propulsion Conference. AIAA 1989-2487. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2487
- Neate, Elroy P. 1972. “Industry Update of DDA Model T63/250 Turboshaft and Turboprop Engine Programs.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/720350
- Neate, E. 1974. “The Detroit Diesel Allison Model 250-C28 Turboshaft Engine.” In 10th Propulsion Conference. AIAA 1974-1186. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1974-1186
- Neiswander, Gregory Mason. n.d. “Improving Rotorcraft Deceleration Guidance for Brownout Landing.” PhD diss., University of Iowa. https://doi.org/10.17077/etd.vzxvjttv
- Neiswander, Gregory. 2011. Improving Deceleration Guidance for Rotorcraft Brownout Landing. https://doi.org/10.4050/vfs-f67-000241
- Neitzel, R., R. Hirschkron, and P. Vinson. 1984. “Studies of Convertible Turboshaft-Turbofan Engines for High Speed Rotorcraft.” In 20th Joint Propulsion Conference. AIAA 1984-1268. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-1268
- Nelms, W. 1978. “Studies of Aerodynamic Technology for VSTOL Fighter/attack Aircraft.” In Aircraft Systems and Technology Conference. AIAA 1978-1511. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1978-1511
- Nelms, W. P. 1984. Assessment of Aerodynamic Performance of V/STOL and STOVL Fighter Aircraft. NASA-TM-85937. NASA. https://ntrs.nasa.gov/citations/19840014468
- Nelson, Norman. 1956. “The Advantages of the Ducted Propeller in VTOL Aircraft Design.” In Proceedings of the American Helicopter Society Western Forum, Dallas, Texas 1956. The Vertical Flight Society. https://doi.org/10.4050/sm_wf_1956-4470
- Nelson, Norman E. 1959. “The Ducted Fan in VTOL Aircraft Design.” Journal of the American Helicopter Society 4 (1): 53–56. https://doi.org/10.4050/jahs.4.53
- Nelson, D. M. 1964. A Lifting-Surface Propeller Design Method for High-Speed Computers. Defense Technical Information Center. https://doi.org/10.21236/ad0430928
- Nelson, Eric M. 2004. Combat Search and Rescue: Building a Joint Capability to Meet the Combatant Commander’s Requirements. Defense Technical Information Center. https://doi.org/10.21236/ada424185
- Nelson, E. B., J. D. Paduano, and A. H. Epstein. 1999. “Active Stabilization of Surge in an Axi-Centrifugal Turboshaft Engine.” In Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/99-gt-438
- Nelson, Kyle J., and Jinwei Shen. 2021. “Whirl Flutter Stability of a Foldable Propeller on Flexible Nacelle Using Multibody Dynamics Analysis.” In AIAA Scitech 2021 Forum. AIAA 2021-1500. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-1500
- Nelson, Kyle J., and Jinwei Shen. 2022. “Propeller Whirl Flutter Study Using Multibody Dynamics Analysis with Component Mode Synthesis Element.” In AIAA SCITECH 2022 Forum. AIAA 2022-1125. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-1125
- Nelson, Kyle J., and Jinwei Shen. 2023. “Multi-Propeller Whirl Flutter Stability Study Using Component Mode Synthesis Element.” In AIAA SCITECH 2023 Forum. AIAA 2023-1509. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1509
- Nelson, Kyle J., Jinwei Shen, Andrew R. Kreshock, Carol Wieseman, and Josiah M. Waite. n.d. “Multi-Propeller Whirl Flutter Stability Study Using Multibody Dynamics Analysis with Component Mode Synthesis Element.” In AIAA SciTech Forum. https://ntrs.nasa.gov/citations/20220017981
- Neogi, Natasha, Mallory Graydon, Jon Holbrook, Jeffrey Maddalon, and Frank McCormick. 2025. “Enabling Novel Collaborative Control Paradigms between Humans and Machines in Electric Vertical Takeoff and Landing (eVTOL) Aircraft.” In Proceedings of the Vertical Flight Society 81st Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0081-2025-0359
- Newman, Simon. 1997. “The Compound Helicopter Configuration and the Helicopter Speed Trap.” Aircraft Engineering and Aerospace Technology 69 (5): 407–13. https://doi.org/10.1108/00022669710177363
- Newman, Simon, and Matthew Orchard. 2000. “Some Design Issues for the Optimisation of the Compound Helicopter Configuration.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f56-00102
- Newman, J. R., Tom Parham, Casey Johnson, and David A. Popelka. 2014. “Wind Tunnel Test Results for a 0.2 Scale 4-Bladed Tiltrotor Aeroelastic Model.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0070-2014-9490
- Newsom, W. A., Jr. 1967. Wind-Tunnel Investigation of a Deflected- Slipstream Cruise-Fan V/STOL Aircraft Wing. NASA-TN-D-4262. NASA. https://ntrs.nasa.gov/citations/19680001568
- Newsom, W. A., Jr., and E. L. Anglin. 1975. Free-Flight Model Investigation of a Vertical-Attitude VTOL Fighter. NASA-TN-D-8054. NASA. https://ntrs.nasa.gov/citations/19750022036
- Ng, Wanyi, and Anubhav Datta. 2018. “Development of Propulsion System Models for Electric-VTOL Aircraft.” In 2018 AIAA Aerospace Sciences Meeting. AIAA 2018-1750. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-1750
- Niazi, Saeid, Ram JanakiRam, and Roger L. Smith. 2006. “Airframe Aerodynamics of the CRW Demonstrator Aircraft in Hover with Winds.” In Proceedings of the Vertical Flight Society Forum 62 - Phoenix, AZ 2006. The Vertical Flight Society. https://doi.org/10.4050/vfs-f62-029
- Nichols, John B. 1960. “Trends in VTOL Aircraft Propulsion System Requirements.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/600265
- Nichols, John B. 1963. “Development of the Tilt-Wing Aircraft.” Journal of the Royal Aeronautical Society 67 (630): 361–70. https://doi.org/10.1017/s0001924000062783
- Nichols, John B. 1968. “A Special Gas Turbine Cycle for the Compound Helicopter.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f24-008
- Nichols, J. 1990. “The Hiller X-18 Experimental Aircraft: Lessons Learned.” In Aircraft Design, Systems and Operations Conference. AIAA 1990-3203. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3203
- Nicholson, Robert, and Randall B. Lowry. 1966. XV-4A VTOL Research Aircraft Program. Defense Technical Information Center. https://doi.org/10.21236/ad0635106
- Nicholson, Robert, and F. E. Tiller. 1970. “Stability and Control Considerations for a Tilt-Fold-Proprotor Aircraft.” In Proceedings of the Vertical Flight Society Forum 26 - Washington, D.C. 1970. The Vertical Flight Society. https://doi.org/10.4050/vfs-f26-021
- Nie, Hongyu, Feng Gu, and Yuqing He. 2024b. “Hierarchical Gain Scheduling Based Tilt Angle Guided Robust Control during Mode Transition for Tilt-Rotor Unmanned Aircraft Vehicle.” International Journal of Advanced Robotic Systems 21 (3): 17298806241246334. https://doi.org/10.1177/17298806241246334
- Niemiec, Robert, Farhan Gandhi, and George Jacobellis. 2014a. “Reversible Airfoil for Stopped Rotors in High Speed Flight.” In Proceedings of the Vertical Flight Society 70th Annual Forum. The Vertical Flight Society. https://doi.org/10.4050/f-0070-2014-9426
- Niemiec, Robert, George Jacobellis, and Farhan Gandhi. 2014b. “Reversible Airfoils for Stopped Rotors in High Speed Flight.” Smart Materials and Structures 23 (11): 115013. https://doi.org/10.1088/0964-1726/23/11/115013
- Niskorodnov, A. V., and L. I. Shvetc. 2020. “Quasi-Two-Dimensional Mathematical Model of Two-Row Contra-Rotating Propfan.” Aviation Engines, no. 4: 43–58. https://doi.org/10.54349/26586061_2020_4_43
- Nitzsche, F. 1988. “Whirl-Flutter Investigation on an Advanced Turboprop Configuration.” In 29th Structures, Structural Dynamics and Materials Conference. AIAA 1988-2346. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-2346
- Nitzsche, F. 1989a. “Insights on the Whirl-Flutter Phenomena of Advanced Turboprops and Propfans.” In 30th Structures, Structural Dynamics and Materials Conference. AIAA 1989-1235. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-1235
- Nitzsche, F., and E. Rodrigues. 1990. “Whirl Flutter Stability of a Pusher Configuration Subject to a Nonuniform Flow.” In 31st Structures, Structural Dynamics and Materials Conference. AIAA 1990-1162. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-1162
- Niwa, S., M. Suzuki, I. Sugiura, J. Kondo, and M. Murakami. 1989. “Development of a Flight Control System for VTOL Aircraft Supported by Ducted Fans.” In Guidance, Navigation and Control Conference. AIAA 1989-3592. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-3592
- Nixon, Mark. 1992. “Parametric Studies for Tiltrotor Aeroelastic Stability in High-Speedflight.” In 33rd Structures, Structural Dynamics and Materials Conference. AIAA 1992-2568. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-2568
- Nixon, Mark W. 1993a. “Aeroelastic Response and Stability of Tiltrotors with Elastically-Coupled Composite Rotor Blades.” PhD diss., Maryland Univ.. https://ntrs.nasa.gov/citations/19940020471
- Nixon, Mark W. 1993b. “Parametric Studies for Tiltrotor Aeroelastic Stability in Highspeed Flight.” Journal of the American Helicopter Society 38 (4): 71–79. https://doi.org/10.4050/jahs.38.71
- Nixon, Mark W., T. Ben Settle, and Raymond G. Kvaternik. 1997b. “Tiltrotor Vibration Reduction through Higher Harmonic Control.” In Proceedings of the Vertical Flight Society Forum 53 - Virginia Beach, VA 1997. The Vertical Flight Society. https://doi.org/10.4050/vfs-f53-230
- Nixon, Mark W., Raymond G. Kvaternik, and T. Ben Settle. 1997a. Higher Harmonic Control for Tiltrotor Vibration Reduction. Army Vehicle Technology Center. https://ntrs.nasa.gov/citations/20040110400
- Nixon, Mark W., Chester W. Langston, Jeffrey D. Singleton, et al. 2001b. “Experimental Investigations of Generalized Predictive Control for Tiltrotor Stability Augmentation.” In Confederation of European Aerospace Societies. https://ntrs.nasa.gov/citations/20040086098
- Nixon, Mark, Chester Langston, Jeffrey Singleton, et al. 2001a. “Aeroelastic Stability of a Soft-Inplane Gimballed Tiltrotor Model in Hover.” In 19th AIAA Applied Aerodynamics Conference. AIAA 2001-1533. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2001-1533
- Nixon, Mark W., Chester W. Langston, Jeffrey D. Singleton, et al. 2003. “Technical Note: Hover Test of a Soft-Inplane Gimballed Tiltrotor Model.” Journal of the American Helicopter Society 48 (1): 63–66. https://doi.org/10.4050/jahs.48.63
- Nixon, Mark W., David J. Piatak, Lawrence M. Corso, and David A. Popelka. 2000. “Aeroelastic Tailoring for Stability Augmentation and Performance Enhancements of Tiltrotor Aircraft.” Journal of the American Helicopter Society 45 (4): 270–79. https://doi.org/10.4050/jahs.45.270
- Nixon, Mark W., and T. Ben Settle. 1997. “Mavss Control of an Active Flaperon for Tiltrotor Vibration Reduction.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f53-229
- Norouzi, Masoud, Ismail Bayezit, and Mahmut Reyhanoglu. 2026. “Integrated FADEC Architecture for Turboshaft Engines: How the Fuel Controller Shapes Protection-Layer Behaviour.” Preprint, . https://doi.org/10.20944/preprints202608.1577.v1
- Novak, L. 1975. “The Lift/cruise Fan Multimission V/STOL Aircraft.” In 11th Annual Meeting and Technical Display. AIAA 1975-277. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1975-277
- Novick, A., T. Lindsey, and W. Arndt. 1985. “Drive System Development for Propfan Test Assessment Program.” In 21st Joint Propulsion Conference. AIAA 1985-1188. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-1188
- O’Brien, Nathan, and Anubhav Datta. 2024. “Lichten Runner-up Paper: Aeroelastic Stability of a Hingeless Hub Tiltrotor at High Speeds.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1175
- O’Brien, Nathan, and Anubhav Datta. 2026a. Mitigation of Whirl-Flutter throughWind Tunnel Testing of a Hingeless-Hub Tiltrotor Model. https://doi.org/10.4050/sm-2026-vlada-5193
- O’Brien, Nathan, and Xavier Delgado. 2024. “40th Student Design Competition Graduate Winner: UMD Arion High-Speed Vertical Takeoff and Landing (HSVTOL) Aircraft.” In Proceedings of the Vertical Flight Society 80th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0080-2024-1410
- O’Bryan, Thomas C. 1961. An Investigation of the Effect of Downwash from a VTOL Aircraft and a Helicopter in the Ground Environment. NASA-TN-D-977. NASA. https://ntrs.nasa.gov/citations/20040008178
- O’Connor, Sean. 1972. “Feel Augmentation and Sensitivity Control in High Speed Helicopters.” Journal of the American Helicopter Society 17 (3): 27–34. https://doi.org/10.4050/jahs.17.3.27
- O’Hara, Brian. n.d. “Comparison of Numerical Simulation to Existing Experimental Data Involving Downwash Wake Reduction for the V-22 Osprey.” PhD diss., West Virginia University Libraries. https://doi.org/10.33915/etd.4181
- O’Mallei, James A. 1957. “Latest Developments in VTOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/570124
- Obertino, Daniele, Phillip Sharikov, Jay Matlock, and Afzal Suleman. 2023. “Design Considerations for Hybrid-Electric Propulsion Systems for FW-VTOL Aircraft.” In Sustainable Aviation. Springer International Publishing. https://doi.org/10.1007/978-3-031-32639-4_2
- Ockier, Carl, and Roberto Celi. 1991. “Dynamics and Aeroelasticity of a Coupled Helicopter Rotor-Propulsionsystem in Hover.” In 32nd Structures, Structural Dynamics, and Materials Conference. AIAA 1991-1220. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-1220
- Oconnell, J. M. 1992. “Predicting Rotorcraft Transmission Noise.” In Vertical Flight Society Forum, vol. 2. https://doi.org/10.4050/vfs-f48-2006
- Ogle, William, Nathan O’Brien, and Anubhav Datta. 2026. Electromagnetic Noise Mitigation on an Electric Tiltrotor Rig and Hover Performance Testing. https://doi.org/10.4050/sm-2026-vlada-5195
- Oh, Sejong, Donghoon Park, and Hyung Min Ji. 2021. “Development of Preliminary Conceptual Design/Comprehensive Analysis Programs for Next Generation Rotorcraft.” Journal of the Korean Society for Aeronautical & Space Sciences 49 (1): 75–84. https://doi.org/10.5139/jksas.2021.49.1.75
- Oh, Seok-Jung, Hyeok Jin Son, Jaeheon Jeong, Jae-Sang Park, and Myeong-Kyu Lee. 2026. “Performance, Vibration, and BVI Noise Analyses of eVTOL Tiltrotor with Sweepback Angles.” Journal of the Korean Society for Aeronautical & Space Sciences 54 (4): 421–30. https://doi.org/10.5139/jksas.2026.54.4.421
- Ohman, Lars, and Vinh Nguyen. 1995. “Comparison of Installed and Free Propeller Characteristics at Mach Numbers 0.6 and 0.7 by Means of Five-Hole Pressure Probe Technique.” In 13th Applied Aerodynamics Conference. AIAA 1995-1778. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1995-1778
- Öhrle, Constantin, Felix Frey, Jakob Thiemeier, Manuel Keßler, and Ewald Kräamer. 2019. “Coupled and Trimmed Aerodynamic and Aeroacoustic Simulations for Airbus Helicopters’ Compound Helicopter RACER.” Journal of the American Helicopter Society 64 (3): 1–14. https://doi.org/10.4050/jahs.64.032003
- Öhrle, Constantin, Felix Frey, Jakob Thiemeier, et al. 2020. “Compound Helicopter X3 in High-Speed Flight: Correlation of Simulation and Flight Test.” Journal of the American Helicopter Society 66 (1): 1–14. https://doi.org/10.4050/jahs.66.012011
- Öhrle, Constantin, Ulrich Schäferlein, Manuel Keßler, and Ewald Krämer. 2018. “Higher-Order Simulations of a Compound Helicopter Using Adaptive Mesh Refinement.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12713
- Okelah, Mohamed. n.d. “Optimization of the Design Parameters of a Co-Turboshaft Gas Turbine Engine as a Heavy Equipment Power Plant.” PhD diss., Carleton University. https://doi.org/10.22215/etd/1981-00568
- Oktay, Tugrul. 2014. “Performance of Minimum Energy Controllers on Tiltrotor Aircraft.” Aircraft Engineering and Aerospace Technology 86 (5): 361–74. https://doi.org/10.1108/aeat-11-2012-0225
- Olcott, Dennis D. 2016. “Tri-Fan VTOL Conceptual Design.” In 16th AIAA Aviation Technology, Integration, and Operations Conference. AIAA 2016-3610. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-3610
- Oliver, Lendell, and Kaydon A. Stanzione. 1993. “Downwash Design Criteria for VTOL Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f49-2046
- Olson, S. R. 1977. “Seakeeping Considerations in the Employment of V/STOL on Naval Ships.” In Naval Postgraduate School Proc. of the Navy(NASA VSTOL Flying Qualities. https://ntrs.nasa.gov/citations/19780011174
- Olson, Rohn. 1992. “V-22 Osprey Tiltrotor Blade-Fold/Wing-Stow System Design and Testing.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/921954
- Olson, Rohn, and William Rumberger. 1991. “V-22 Osprey Tiltrotor Blade Fold/wing Stow System Design and Testing.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f47-2040
- “On the Rotor Lifting Line Wake Model.” 2016. Journal of Ship Production and Design. https://doi.org/10.5957/jspd.32.3.150035
- Ondra, Vaclav, Robert Dibble, Branislav Titurus, and Benjamin K. Woods. 2019. “An Active Tendon Concept in Rotorcraft with Variable Speed Rotors: Free Vibration Perspective.” In AIAA Scitech 2019 Forum. AIAA 2019-0857. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-0857
- Orchard, M. N., and S. J. Newman. 1999. “The Compound Helicopter — Why Have We Not Succeeded Before?” Aeronautical Journal 103 (1028): 489–95. https://doi.org/10.1017/s0001924000064526
- Ormiston, Robert A. 2015. “Revitalizing Advanced Rotorcraft Research—and the Compound Helicopter: 35th AHS Alexander a. Nikolsky Honorary Lecture.” Journal of the American Helicopter Society 61 (1): 1–23. https://doi.org/10.4050/jahs.61.011001
- Ormiston, R. A. 2016. “Revitalising Advanced Rotorcraft Research – and the Compound Helicopter.” Aeronautical Journal 120 (1223): 83–129. https://doi.org/10.1017/aer.2015.5
- Orr, Stanley, and Prabhat Hajela. 2005. “A Comprehensive Model for Multi-Disciplinary Design of a Tiltrotor Configuration.” In 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. AIAA 2005-2284. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2005-2284
- Orrick, Jared. 2024. Electric Propulsion System Sizing for Martian Rotorcraft. https://doi.org/10.52202/078379-0023
- Ossyra, Stanley, Hetkumar Ghadia, Alex Walsh, and Subodh Bhandari. 2025. “Design, Analysis, and Flight-Testing of a Tandem-Wing e-VTOL UAV.” In AIAA SCITECH 2025 Forum. AIAA 2025-2009. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-2009
- Ostheimer, A. J., and R. G. Giguere. 1963. Design and Development of a Flight Path Control System for Helicopters/ VTOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0402379
- Oswalt, John. 1967. Operational Problems and Experience with Vertical-Lift Aircraft Light and Utility Helicopters. https://doi.org/10.4050/sm_tact_1967-3717
- Otis, J. H., Jr. 1962. Induced Interference Effects on a Four-Jet VTOL Configuration with Various Wing Planforms in the Transition Speed Range. NASA-TN-D-1400. NASA. https://ntrs.nasa.gov/citations/19620005319
- Ott, Mark. 2019. “Adaptive Frahm for Variable-Speed Rotor Helicopters.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14574
- Öttl, Christoph, and Reinhard Willinger. 2020. “Thermodynamic and Mechanical Design Concept for Micro-Turbojet to Micro-Turboshaft Engine Conversion.” In Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Microturbines, Turbochargers, and Small Turbomachines. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2020-14498
- Ouyang, Xinxin, Yun Peng, Guoyi He, Jialin Yu, and Wentong Deng. 2026. “Numerical Investigation of Drag Characteristics of a Tiltrotor Wing under Steady Blowing.” Advances in Aerospace Science and Technology 11 (01): 20–35. https://doi.org/10.4236/aast.2026.111002
- Overfield, Jerome L., and Horace R. Crawford. 1967. Investigation of Hydraulic Power Transmission Systems for V/STOL Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0661311
- Overmeyer, Austin D., and Preston B. Martin. 2017. “Measured Boundary Layer Transition and Rotor Hover Performance at Model Scale.” In 55th AIAA Aerospace Sciences Meeting. AIAA 2017-1872. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-1872
- Owen, A. Karl, Duane L. Mattern, and Dzu K. Le. 1996a. “Comparisons of Rig and Engine Dynamic Events in the Compressor of an Axi-Centrifugal Turboshaft Engine.” In Volume 1: Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/96-gt-239
- Owen, A., Duane Mattern, Dzu Le, and Donald Braun. 1996b. “Forced Response Testing of an Axi-Centrifugal Turboshaft Engine.” In 32nd Joint Propulsion Conference and Exhibit. AIAA 1996-2573. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1996-2573
- Oyama, Yukei, Mohsen Rostami, and Joon Chung. 2024. “Conceptual Design and Analysis of a Box Fan-in-Split-Wing Tiltrotor eVTOL Aircraft.” Aircraft Engineering and Aerospace Technology 96 (9): 1139–51. https://doi.org/10.1108/aeat-06-2023-0167
- Öznalbant, Zafer, and Mehmet S. Kavsaoglu. 2015. “Design and Flight Test Study of a VTOL UAV.” In 53rd AIAA Aerospace Sciences Meeting. AIAA 2015-1903. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1903
- Öznalbant, Zafer, Mehmet Serif Kavsaoğlu, and Mustafa Cavcar. 2016. “Design, Flight Mechanics and Flight Demonstration of a Tiltable Propeller VTOL UAV.” In 16th AIAA Aviation Technology, Integration, and Operations Conference. AIAA 2016-3446. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-3446
- Padfield, G. D. 2008. “Capturing Requirements for Tiltrotor Handling Qualities – Case Studies in Virtual Engineering.” Aeronautical Journal 112 (1134): 433–48. https://doi.org/10.1017/s0001924000002402
- Padula, S., and P. Block. 1984. “Predicted Changes in Advanced Turboprop Noise with Shaft Angle of Attack.” In 9th Aeroacoustics Conference. AIAA 1984-2347. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-2347
- Pagano, Antonio. 2018. “Aerodynamic Analyses of Tiltrotor Morphing Blades.” In Morphing Wing Technologies. Elsevier. https://doi.org/10.1016/b978-0-08-100964-2.00025-3
- Painter, W. 1983. “AD-1 Oblique Wing Research Aircraft Pilot Evaluation Program.” In Aircraft Design, Systems and Technology Meeting. AIAA 1983-2509. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-2509
- Painter, W., and R. Erickson. 1984. “Rotor Systems Research Aircraft Airplane Configuration Flight-Test Results.” In Aircraft Design Systems and Operations Meeting. AIAA 1984-2465. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-2465
- Pakmehr, Mehrdad, Nthan Fitzgerald, James Paduano, Eric Feron, and Alireza Behbahani. 2011. “Decentralized Adaptive Control of a Piecewise Linear Turboshaft Engine Model.” In AIAA Guidance, Navigation, and Control Conference. AIAA 2011-6285. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2011-6285
- Palaia, Giuseppe, Vittorio Cipolla, Vincenzo Binante, and Emanuele Rizzo. 2019. “Preliminary Design of a Box-Wing VTOL UAV.” Aircraft Engineering and Aerospace Technology 92 (5): 737–43. https://doi.org/10.1108/aeat-06-2019-0121
- Panayotov, Hristian, and Martin Zikyamov. 2026. “Common-Form Statistical Relations for Conceptual Sizing of Electric and Hybrid VTOL Unmanned Aircraft.” Preprint, Research Square. https://doi.org/10.21203/rs.3.rs-10915692/v1
- Pande, J. Bradley. 1999. “Flywheel Rotor/Wing Makes Stopped Rotor Aircraft Practical.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f55-00086
- Pandya, S., and M. J. Aftosmis. 2000. Computation of External Aerodynamics for a Canard Rotor/Wing Aircraft. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20010066498
- Pandya, S., and M. Aftosmis. 2001. “Computation of External Aerodynamics for a Canard Rotor/wing Aircraft.” In 39th Aerospace Sciences Meeting and Exhibit. AIAA 2001-997. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2001-997
- Panish, Leo, and Marko Bacic. 2022. “Transition Trajectory Optimization for a Tiltwing VTOL Aircraft with Leading-Edge Fluid Injection Active Flow Control.” In AIAA SCITECH 2022 Forum. AIAA 2022-1082. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-1082
- Panish, Leo, and Marko Bacic. 2023. “A Generalized Full-Envelope Outer-Loop Feedback Linearization Control Strategy for Transition VTOL Aircraft.” In AIAA AVIATION 2023 Forum. AIAA 2023-4511. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-4511
- Panish, Leo, Chris Nicholls, and Marko Bacic. 2023. “Nonlinear Dynamic Inversion Flight Control of a Tiltwing VTOL Aircraft.” In AIAA SCITECH 2023 Forum. AIAA 2023-1910. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1910
- Paris, Manuel, François Malburet, Paul Eglin, and Jean-Claude Carmona. 2014. “Control Loads Reduction through Control System Architecture Optimization: Application to a Conventional Rotor on a Compound Helicopter.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0070-2014-9494
- Park, Jae-Sang. 2017. “Validation of Loads Analysis for a Slowed Rotor at High Advance Ratios.” International Journal of Aeronautical and Space Sciences 18 (3): 498–511. https://doi.org/10.5139/ijass.2017.18.3.498
- Park, Minjun, and Se Hwan Park. 2025. “Sizing Method for Series Hybrid Electric Propulsion Systems in Vertical Take-Off and Landing (Vtol) Aircraft.” Preprint, . https://doi.org/10.2139/ssrn.5139477
- Park, M., and N. Roh. 2025. “Deterministic Hybrid Power System Considering Various Failure Modes in Generic Quad Tiltrotor Aircraft.” Aeronautical Journal 130 (1344): 485–507. https://doi.org/10.1017/aer.2025.10094
- Park, Youn, and Andreas Schlaich. 2019. “Dynamic Interactions in an Electromechanical Main Gearbox of a High-Speed Coaxial Compound Helicopter.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14670
- Park, Sooin, and Usama Younus. 2025. “Surrogate-Based Aerodynamic Optimization of Proprotor Blades for a Parcel Delivery UAV.” Incas Bulletin 17 (3): 35–47. https://doi.org/10.13111/2066-8201.2025.17.3.4
- Parker, Robert. 2008. Analytical/Computational Investigation of Planetary Gear Dynamics in Rotorcraft Transmissions. Defense Technical Information Center. https://doi.org/10.21236/ada499395
- Parwani, Ashwin, and James G. Coder. 2018. “Effect of Laminar-Turbulent Transition Modeling on PSP Rotor Hover Predictions.” In 2018 AIAA Aerospace Sciences Meeting. AIAA 2018-0308. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-0308
- Passe, Bradley, and Kip Campbell. 2023. High-Speed Vtol Drive-Shaft Systems and Methods. https://patents.google.com/patent/US20230331393A1/en
- Patierno, John, and Haig Asdurian. 1965. “Impact of Control Provisions on Mission Performance of Jet VTOL Aircraft Using Reaction Control Systems.” In Proceedings of the 1st National Symposium on V/STOL Aircraft, Subsystem Design and Testing and Operation - Ohio 1965. The Vertical Flight Society. https://doi.org/10.4050/sm_vstol_1965-3112
- Patrao, Alexandre Capitao, Tomas Grönstedt, Anders Lundbladh, and Gonzalo Montero Villar. 2019. “Wake Analysis of an Aerodynamically Optimized Boxprop High-Speed Propeller.” Journal of Turbomachinery 141 (9): 091011. https://doi.org/10.1115/1.4043974
- Patton, James M. 1972. “A Pilot’s Opinion: VTOL Control Design Requirements for the Instrument Approach Task.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f28-026
- Pauli, F. 1964. “A System to Vary the Stability and Control of a Deflected-Jet, Fixed-Wing Vtol Aircraft.” In General Aviation Aircraft Design and Operations Meeting. AIAA 1964-194. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-194
- Pavlov, V. V. 2016. “A Mathematical Model of Transforming the Vertical Takeoff and Landing Aircraft with a Disk Wing at Maneuvering (on a Deck).” Russian Aeronautics 59 (4): 507–16. https://doi.org/10.3103/s1068799816040115
- Peacock, N. 1987. “Engine Design and Systems Integration for Propfan and High Bypass Turbofan Engines.” In 23rd Joint Propulsion Conference. AIAA 1987-1730. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-1730
- Pei, Jing, Jared A. Grauer, Jason Welstead, Luke J. Miller, and Han Woong Bae. 2023. “Feasibility Study of a Multi Tilt-Rotor Aircraft as the Artemis Lunar Training Vehicle.” In AIAA SCITECH 2023 Forum. AIAA 2023-1908. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1908
- Pei, Jing, and Carlos Roithmayr. 2022a. “Equation of Motion for a Generic Multibody Tilt-Rotor Aircraft.” In AIAA Aviation Forum 2022. https://ntrs.nasa.gov/citations/20220006436
- Pei, Jing, and Carlos Roithmayr. 2022b. “Equations of Motion for a Generic Multibody Tilt-Rotor Aircraft.” In AIAA AVIATION 2022 Forum. AIAA 2022-3511. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-3511
- Peluso, James. 1992. “Turboshaft/turboprop Cycle Sensitivity Analysis.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3476. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3476
- Peng, Cheng, Xin Min Wang, and Xiao Chen. 2013. “Design of Tiltrotor Flight Control System in Conversion Mode Using Improved Neutral Network PID.” Advanced materials research 850-851: 640–43. https://doi.org/10.4028/www.scientific.net/amr.850-851.640
- Perez, David Garcia, Patricia Ventura Diaz, Anthony Sanguinetti, and Steven Seokkwan Yoon. n.d. “Tiltwing Transition Flight Analysis Using High-Fidelity CFD.” In The Vertical Flight Society’s 80th Annual Forum & Technology Display. https://ntrs.nasa.gov/citations/20240005261
- Perez, David Garcia, Patricia Ventura Diaz, and Seokkwan Yoon. 2025. “Prediction of Laminar-to-Turbulent Transition for the XV-15 Hovering Rotor Flows Using a Crossflow Model.” In AIAA Aviation Forum. https://ntrs.nasa.gov/citations/20250006476
- Perrotta, Gino M. 2015. “Characterization of Rotor Wake in Ground Effect.” In 53rd AIAA Aerospace Sciences Meeting. AIAA 2015-0370. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-0370
- Persson, Linnea, and Ben Lawrence. 2017. Design and Control of an Experimental Tilt-Wing Aircraft. NASA/CR-2017-219456. NASA. https://ntrs.nasa.gov/citations/20190001251
- Peryea, Martin, and T. L. Wood. 1993. “Reduction of Tiltrotor Download.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f49-2030
- Peters, Nicholas. 2025. RotLES: A Rotorcraft-Based Lattice Boltzmann LES Code for Rapid Analysis and Design Space Exploration. NASA/TM-20250007146. NASA. https://ntrs.nasa.gov/citations/20250007146
- Peters, David, Jorge Morillo, David Peters, and Jorge Morillo. 1997. “Harmonic Balance Approach for Rotorcraft with Both Unsteady and Unknown Rotor Speed.” In 38th Structures, Structural Dynamics, and Materials Conference. AIAA 1997-1095. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1997-1095
- Peters, Nicholas, and Dorsa Shirazi. 2025. “On the Application of an Actuator Line Model for Rotorcraft Outwash Predictions.” In AIAA SCITECH 2025 Forum. AIAA 2025-1068. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-1068
- Peters, Andreas, and Zolta´n S. Spakovszky. 2010. “Rotor Interaction Noise in Counter-Rotating Propfan Propulsion Systems.” In Volume 7: Turbomachinery, Parts A, B, and C. ASMEDC. https://doi.org/10.1115/gt2010-22554
- Peterson, J. 1964. “The Lift Fan V/stol Concept for Future Applications.” In General Aviation Aircraft Design and Operations Meeting. AIAA 1964-196. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-196
- Peterson, C. L., and S. J. Sutter. 1987. “Vertical Lift Aircraft Air to Air Combat, the Attributes for Success.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f43-1027
- Peterson, Ltc Allen L., Ltc Jeffrey A. Trang, and John Wood. 2001. “Applying Rotorcraft Technology in the New Millennium: U.S. Army R&D Flight Test Update.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f57-00025
- Petrov, A. 1993. “Aerodynamics of STOL Aircraft with Wings Blowing by Turbofan Exhaust Jets and Propfan Slipstreams.” In International Powered Lift Conference. AIAA 1993-4832. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-4832
- Pfeiff, Robert. 1965. “X-22A Flight Test Program.” In Proceedings of the 1st National Symposium on V/STOL Aircraft, Subsystem Design and Testing and Operation - Ohio 1965. The Vertical Flight Society. https://doi.org/10.4050/sm_vstol_1965-5003
- Pfeil, W. H. 1986. Multi-Variable Control Concept for Turboshaft Engines. https://doi.org/10.4050/sm_1986_prop-3553
- Pfeil, W., G. De Los Reyes, and G. Bobula. 1984. “The Application of LQR Synthesis Techniques to the Turboshaft Enginecontrol Problem.” In 20th Joint Propulsion Conference. AIAA 1984-1455. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-1455
- Pham, Dahlia, Jeffrey Bowles, Carl Recine, and Susie Go. 2023. “Advanced Turboprop Transport Aircraft Modeling for the Electrified Powertrain Flight Demonstration Project.” In AIAA AVIATION 2023 Forum. AIAA 2023-3870. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-3870
- Philhower, Jeffry. 2002. “Enabling a Long Range, VTOL Propulsion System for the US Navy.” In 38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. AIAA 2002-3625. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-3625
- Phillips, Catriona, and Richard E. Brown. 2008. “Eulerian Simulation of the Fluid Dynamics of Helicopter Brownout.” In Proceedings of the Vertical Flight Society AHS 64th Annual Forum, Montréal, Québec, April 29-May 1, 2008. The Vertical Flight Society. https://doi.org/10.4050/vfs-f64-000013
- Phillips, Catriona, Hyo Won Kim, and Richard E. Brown. 2010. “The Flow Physics of Helicopter Brownout.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f66-000242
- Piancastelli, Luca, Irene Giusti, and Marella De Santis. 2026. “An Innovative Thermal Flow Management Approach for High-Altitude Turboshaft Test Benches.” ASME Open Journal of Engineering 5: 051020. https://doi.org/10.1115/1.4071798
- Piatak, David J., Raymond G. Kvaternik, Mark W. Nixon, et al. 2002. “A Parametric Investigation of Whirl-Flutter Stability on the WRATS Tiltrotor Model.” Journal of the American Helicopter Society 47 (2): 134–44. https://doi.org/10.4050/jahs.47.134
- Pickles, D. J., R. B. Green, and M. Giuni. 2018. “Rotor Wake Interactions with an Obstacle on the Ground.” Aeronautical Journal 122 (1251): 798–820. https://doi.org/10.1017/aer.2018.7
- Pisano, Alan. 1979a. “Failure Indication and Corrective Action for Turboshaft Engines.” In Proceedings of the Specialists Meeting on Helicopter Propulsion Systems, Williamsburg, Virginia, November 1979. The Vertical Flight Society. https://doi.org/10.4050/sm_prop_1979-2726
- Pisano, Alan D. 1979b. “Failure Indication and Corrective Action for Turboshaft Engines.” Journal of the American Helicopter Society 25 (4): 1–10. https://doi.org/10.4050/jahs.25.36
- Pisano, Anthony P., Matthew McCrink, and Jeffrey P. Bons. 2025. “Hover Flight Testing of a Coanda Circulation Control Actuated VTOL Tail-Sitter UAV.” In AIAA SCITECH 2025 Forum. AIAA 2025-2197. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-2197
- Pisano, Alan D., Bradley Rufleth, and Charles Frankenberger. 2008. The T700 SECAD Project – Damage Tolerant Control Design for Turboshaft Engines. https://doi.org/10.4050/vfs-f64-000151
- Piscopo, P., R. Lazarick, and J. Cyrus. 1980. “Fuel Conservation Benefits and Critical Technologies of Recuperativeand Advanced Conventional Cycle Turboshaft Engines.” In 18th Aerospace Sciences Meeting. AIAA 1980-224. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-224
- Pittsburgh Univ Washington DC Research Staff. 1966. Research Aircraft, XV-5A. Defense Technical Information Center. https://doi.org/10.21236/ad0482131
- Platt, Robert J., Jr., and Jean Gilman Jr. 1949. “Investigation of a Dual Propeller at High-Subsonic Mach Numbers.” In NACA Conference on Aerodynamic Problems of Transonic Airplane Design. https://ntrs.nasa.gov/citations/19650074081
- Platzer, M., and R. Margason. 1976. “Prediction Methods for Jet V/STOL Propulsion Aerodynamics.” In Aircraft Systems and Technology Meeting. AIAA 1976-932. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1976-932
- Pobikrowska, Katarzyna, and Tomasz Goetzendorf-Grabowski. 2025. “VTOL UAV Optimal Control in the Transition Phase.” Aircraft Engineering and Aerospace Technology 97 (9): 1085–94. https://doi.org/10.1108/aeat-01-2025-0001
- Poisson-Quinton, Ph., and W. L. Cook. 1972. A Summary of Wind Tunnel Research on Tilt Rotors from Hover to Cruise Flight. NASA-TM-X-68948. NASA. https://ntrs.nasa.gov/citations/19730010285
- Poisson-Quinton, Ph., and W. L. Cook. 1973. A Summary of Wind Tunnel Research on Tilt-Rotors from Hover to Cruise Flight. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19730012322
- Polacsek, C., P. Spiegel, F. Boyle, J. Eaton, H. Brouwer, and R. Nijboer. 2000. “Noise Computation of High-Speed Propeller-Driven Aircraft.” In 6th Aeroacoustics Conference and Exhibit. AIAA 2000-2086. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2000-2086
- Poling, David R., Harold J. Rosenstein, and Ganesh Rajagopalan. 1996. “Use of a Unique Navier-Stokes Code in Understanding Tiltrotor Flowfields in Hover.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f52-1135
- Poling, David R., Harold J. Rosenstein, and Ganesh Rajagopalan. 1998. “Use of a Navier-Stokes Code in Understanding Tiltrotor Flowfields in Hover.” Journal of the American Helicopter Society 43 (2): 103. https://doi.org/10.4050/jahs.43.103
- Pollard, Beau P., Jason R. Welstead, and Siena K. S. Whiteside. 2023. Design of a Multi-Tiltrotor Concept Vehicle for Urban Air Mobility: “Version 0” Design, Design Review: Nov 3, 2021. Langley Research Center. https://ntrs.nasa.gov/citations/20230007698
- Polzin, William, Kanchan Guntupalli, and R. Ganesh Rajagopalan. 2011. “Discrete Blade Model for Rotorcraft Brownout.” In 29th AIAA Applied Aerodynamics Conference. AIAA 2011-3182. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2011-3182
- Pölzlbauer, P., C. Breitsamter, and D. Desvigne. 2019. “Performance Improvement of a Compound Helicopter Rotor Head by Aerodynamic Design Optimisation of a Blade-Sleeve Fairing.” Aeronautical Journal 123 (1268): 1456–75. https://doi.org/10.1017/aer.2018.172
- Ponomariov, Boris A. 1990. “New Generation of the Small Turboshaft and Turboprop Engines in the U.S.S.R.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/90-gt-195
- Popelka, David, David Lindsay, Tom Parham, Victor Berry, and Donald J. Baker. 1997. “Results of an Aeroelastic Tailoring Study for a Composite Tiltrotor Wing.” Journal of the American Helicopter Society 42 (2): 126–36. https://doi.org/10.4050/jahs.42.126
- Popov, Grigorii, Evgenii Goriachkin, Igor Egorov, et al. 2021. “Improvement of Aerodynamic and Strength Characteristics of a Multi-Shaft Axial Turbine of a Turboshaft Engine.” In Volume 2D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2021-59682
- Porcacchia, Federico, Fabio Riccardi, Andrea Mancini, Matteo Pecoraro, Andrea Ragazzi, and Luca Vigano. 2023. “Assessment of Numerical Approaches for Modelling Tilt-Rotor Ground Effect Stability in Hover and near Hover Conditions.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18070
- Potsdam, Mark, Anubhav Datta, and Buvana Jayaraman. 2012. Computational Investigation and Fundamental Understanding of a Slowed UH-60A Rotor at High Advance Ratios. https://doi.org/10.4050/vfs-f68-000399
- Potsdam, Mark, Anubhav Datta, and Buvana Jayaraman. 2016. “Computational Investigation and Fundamental Understanding of a Slowed UH-60A Rotor at High Advance Ratios.” Journal of the American Helicopter Society 61 (2): 1–17. https://doi.org/10.4050/jahs.61.022002
- Potsdam, Mark A., and Roger C. Strawn. 2002a. “CFD Simulations of Tiltrotor Configurations in Hover.” In Proceedings of the Vertical Flight Society Forum 58 - Montreal, Canada 2002. The Vertical Flight Society. https://doi.org/10.4050/vfs-f58-00026
- Potsdam, Mark, and Roger C. Strawn. 2002b. “CFD Simulations of Tiltrotor Configurations in Hover.” Journal of the American Helicopter Society 50 (1): 1–16. https://doi.org/10.4050/1.3092845
- Prabhakar, Nirmit, Francesco Salucci, and Dominik Karbowski. 2025. “Simulating System and Powerplant Dynamics of an e-VTOL Aircraft for a Full Flight Mission Including Transition.” In AIAA Aviation Forum and Ascend 2025. AIAA 2025-3558. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-3558
- Preator, Robin, J. Gordon Leishman, and G. Douglas Baldwin. 2005. Performance and Trade Studies of a Mono Tiltrotor Design. https://doi.org/10.4050/vfs-f61-000177
- Predesign Report for the Rotor Systems Research Aircraft. 1972. NASA-CR-112156. NASA. https://ntrs.nasa.gov/citations/19720025370
- Preliminary Design of Propulsion System for V/STOL Research and Technology Aircraft. 1977. NASA-CR-135207. NASA. https://ntrs.nasa.gov/citations/19770020171
- Preliminary Design Study of Advanced Composite Blade and Hub and Nonmechanical Control System for the Tilt-Rotor Aircraft. Volume 2: Project Planning Data. 1980. NASA-CR-152336-2. NASA. https://ntrs.nasa.gov/citations/19810014532
- Price, G. 1964a. “A Comparison of the Agility Performance of a Number of V/stol and Stol Aircraft.” In General Aviation Aircraft Design and Operations Meeting. AIAA 1964-181. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-181
- Price, G. 1964b. “Factors Affecting Design Requirements of Armed Tactical Support V/stol Aircraft.” In Military Aircraft Systems and Technology Meeting. AIAA 1964-772. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-772
- Prichard, Devon S. 2000. “Initial Tiltrotor Aeroacoustic Code (TRAC) Predictions for the XV-15 Flight Vehicle and Comparison with Flight Measurements.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f56-00068
- Pricker, Ilja, and Sophie F. Armanini. 2023. “Modeling, Simulation and Control of a Tailsitter Tiltrotor MAV.” In AIAA SCITECH 2023 Forum. AIAA 2023-0338. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-0338
- Primatesta, Stefano, Federico Barra, Simone Godio, Giorgio Guglieri, and Pierluigi Capone. 2023. “Implementation of a Comprehensive Real-Time Flight Simulator for XV-15 Tilt-Rotor Aircraft.” In AIAA SCITECH 2023 Forum. AIAA 2023-0336. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-0336
- “Propfan Propulsion System Tested.” 1986. Aircraft Engineering and Aerospace Technology 58 (12): 21–21. https://doi.org/10.1108/eb036376
- Pruyn, Richard, and Robert Taylor. 1970. “Design Considerations for Tilt-Rotor VTOL Aircraft to Minimize the Effects of the Recirculating Downwash Environment.” In Proceedings of the Specialists Meeting on Environmental Effects on VTOL Designs - Arlington, Texas 1970. The Vertical Flight Society. https://doi.org/10.4050/sm_env_1970-2300
- Pruyn, Richard R., and Robert B. Taylor. 1971. “Design Considerations for Tilt-Rotor VTOL Aircraft to Minimize the Effects of the Recirculating Downwash Environment.” Journal of the American Helicopter Society 16 (4): 2–8. https://doi.org/10.4050/jahs.16.4.2
- Pruynn, Richard, and Robert Shannon. 1980. Design Optimization of Rotor Systems for Tilt-Rotor Aircraft That Fold for Shipboard Compatibility. https://doi.org/10.4050/sm_rotor_1980-2326
- Przedpelski, Z. 1965. “Lift Fans for Advanced V/STOL Aircraft.” In Low-Speed Flight Meeting. AIAA 1965-708. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1965-708
- Przedpelski, Z. J. 1984. “The T700-GE-700 Engine Experience in Sand Environment.” Journal of the American Helicopter Society 29 (4): 63–69. https://doi.org/10.4050/jahs.29.63
- Puchuela, Elvin, and Lakshmi N. Sankar. 2025. Application of an Inverse Airfoil Design for Improved Proprotor Performance. https://doi.org/10.4050/sm_avtol_2025-5313
- Pulla, Devi, and T. Conlisk. 2005. “The Long Time Structure of the Rotor Wake in Ground Effect.” In 43rd AIAA Aerospace Sciences Meeting and Exhibit. AIAA 2005-1408. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2005-1408
- Punzi, Claudio, Mark Crooks, Andrea Mancini, Federico D’Amico, and Eleonora Giovanardi. 2024. “A Multidisciplinary Mid-Fidelity Approach for Tiltrotor Wing Aeroelastic Design Based on Structural Mesh Morphing.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1149
- Putman, William F. 1961. Results of Experiments on a Tilt-Wing VTOL Aircraft Using the Princeton University Forward Flight Facility. Defense Technical Information Center. https://doi.org/10.21236/ad0270217
- Pyle, Terry, and Dan Aldrich. 1990. “Garrett’s Turboshaft Engines and Technologies for the 1990s.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/90-gt-204
- Qin, Derek Xiao. 2023. “Vertical Takeoff and Landing Aircraft: Categories, Applications, and Technology.” Theoretical and Natural Science 13 (1): 126–29. https://doi.org/10.54254/2753-8818/13/20240810
- Qu, Shen, Tianyi He, and Weihua Su. 2024. “Mixed Model Predictive Control and Data-Driven Control of a Tiltrotor eVTOL Aircraft.” In AIAA SCITECH 2024 Forum. AIAA 2024-0517. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-0517
- Quackenbush, Todd R., Alexander H. Boschitsch, Daniel A. Wachspress, and Kiat Chua. 1993. Rotor Design Optimization Using a Free Wake Analysis. NASA-CR-177612. NASA. https://ntrs.nasa.gov/citations/19930015886
- Quackenbush, Todd R., Bruce D. Charles, Ahmed A. Hassan, and Ram D. Janakiram. 1995. “An Assessment of Current Methodology for Predicting Tiltrotor Blade-Vortex Interaction Aerodynamics.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f51-2030
- Quackenbush, Todd R., Luigi Ricci Moretti, Kenneth Steven Brentner, Daniel A. Wachspress, Dinesh Barwey, and Robert Michael Lewis. 2019. “Aeroacoustic Modeling of an eVTOL Slowed Rotor Winged Compound Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14454
- Quackenbush, Todd R., Christine Solomon, Daniel A. Wachspress, and Michael Yu. 2020b. “Modeling of Proprotor / Wing / Flap Interaction for Advanced Vertical Lift Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0076-2020-16484
- Quackenbush, Todd R., and Daniel A. Wachspress. 2006. “Impact of Rotor Design on Coaxial Rotor Performance, Wake Geometry and Noise.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f62-004
- Quackenbush, Todd R., Glen R. Whitehouse, Benjamin Silbaugh, and Pavel V. Danilov. 2017. “Analysis of Download and Rotor/Airframe Interactions in Hover.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12019
- Quackenbush, Todd R., Glen R. Whitehouse, Benjamin Silbaugh, and Pavel V. Danilov. 2018. “Analysis of Rotor Configuration and Ground Proximity Effects on Hover Download.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12700
- Quackenbush, Todd R., Glen R. Whitehouse, Benjamin Silbaugh, and Pavel V. Danilov. 2020a. “Download and Rotor Installed Performance in Hover and Low Advance Ratio Flight.” In AIAA Scitech 2020 Forum. AIAA 2020-0772. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-0772
- Quaranta, Hugo. n.d. “Instabilities in a Swirling Rotor Wake.” PhD diss., Aix-Marseille. https://doi.org/10.70675/0bf3a25fz51f8z475eza980z2d0336593396
- Quigley, H. C. 1964. Simulation Techniques for the Study of V/STOL PROBLEMS. NASA Ames Research Center. https://ntrs.nasa.gov/citations/19660003383
- Quigley, Hervey C., and David G. Koenig. 1961. A Flight Study of the Dynamic Stability of a Tilting-Rotor Convertiplane. NASA-TN-D-778. NASA. https://ntrs.nasa.gov/citations/20030004848
- Quinn, John. 1997. “Rapid Technology Insertion into the T700 Growth Engines.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f53-3004
- Quintana, Anthony G., Brian E. Saunders, Rui Vasconcellos, and Abdessatar Abdelkefi. 2022. “Nonlinear Characterization of the Piecewise Structural Effects on Whirl Flutter of a Rotor-Nacelle System.” In AIAA SCITECH 2022 Forum. AIAA 2022-2269. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-2269
- Quintana, Anthony G., Rui Vasconcellos, Glen Throneberry, and Abdessattar Abdelkefi. 2020. “Nonlinear Reduced-Order Modeling and Bifurcation Analysis of Whirl Flutter in a Rotor-Nacelle System.” In AIAA Aviation 2020 Forum. AIAA 2020-3181. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-3181
- Raamesh, B., Ranga Srinivas Gokul, and Tufan K. Guha. 2024. “Experimental Study on the Effect of Sinusoidal Trailing Edge for the Control of Reverse Flow on High-Speed Rotorcraft.” In AIAA Aviation Forum and Ascend 2024. AIAA 2024-4105. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-4105
- Radford, R. C., A. E. Schelhorn, R. J. Siracuse, R. D. Till, and R. Wasserman. 1976. Evaluation of XV-15 Tilt Rotor Aircraft for Flying Qualities Research Application. NASA-CR-137828. NASA. https://ntrs.nasa.gov/citations/19760017120
- Radhakrishnan, Anand, and Fredric Schmitz. 2003. “An Experimental Investigation of a Quad Tilt Rotor in Ground Effect.” In 21st AIAA Applied Aerodynamics Conference. AIAA 2003-3517. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-3517
- Radhakrishnan, Anand, and Fredric Schmitz. 2005. “Quad Tilt Rotor Aerodynamics in Ground Effect.” In 23rd AIAA Applied Aerodynamics Conference. AIAA 2005-5218. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2005-5218
- Radhakrishnan, Anand, and Fredric Schmitz. 2006. “Quad Tilt Rotor Download and Power Measurements in Ground Effect.” In 24th AIAA Applied Aerodynamics Conference. AIAA 2006-3471. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-3471
- Radotich, Michael. n.d. “Conceptual Design of Tiltrotor Aircraft for Urban Air Mobility.” In Aeromechanics for Advanced Vertical Flight Technical Meeting, Transformative Vertical Flight 2022. https://ntrs.nasa.gov/citations/20210026219
- Radotich, Michael. 2024. Conceptual Design Trade Studies for Acoustic Predictions of the NASA UAM Tiltrotor Reference Vehicle. https://doi.org/10.4050/sm-2024-tvf-5076
- Radotich, Michael. 2026. “TVF 2026: Foundations of Vertical Flight: NASA Rotorcraft Outwash Test Overview by NASA Ames Research Center.” In Proceedings of the Vertical Flight Society Electric VTOL Symposium - San Jose, California, Jan 2026. The Vertical Flight Society. https://doi.org/10.4050/sm_evtol_2026-5239
- Rae, W. H., Jr. 1973. Some Comments on V/STOL Wind Tunnel Testing in the Transition Flight Region. Washington, University. https://ntrs.nasa.gov/citations/19740039727
- Rae, W. H., Jr., and S. Shindo. 1969. “Comments on V/STOL Wind Tunnel Data at Low Forward Speeds.” In AERODYNAMICS OF ROTARY WING AND V/STOL AIRCRAFT, SYMPOSIUM. https://ntrs.nasa.gov/citations/19690057240
- Raghavan, V., W. J. McCroskey, J. D. Baeder, and W. R. Van Dalsem. 1990. Calculations of the Flow past Bluff Bodies, Including Tilt-Rotor Wing Sections at Alpha = 90 Deg. AIAA PAPER 90-0032. Sterling Software. https://ntrs.nasa.gov/citations/19900035101
- Rais-Rohani, Masoud. 1993. “Wing Design for a Civil Tiltrotor Transport Aircraft: A Preliminary Study.” In Old Dominion Univ., The 1993 NASA-ODU American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program. https://ntrs.nasa.gov/citations/19940023414
- Rais-Rohani, Masoud. 1994a. “Thin Tailored Composite Wing for Civil Tiltrotor.” In Hampton Univ., 1994 NASA-HU American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program. https://ntrs.nasa.gov/citations/19950016897
- Rais-Rohani, Masoud. 1994b. Wing Design for a Civil Tiltrotor Transport Aircraft. NASA-CR-197523. NASA. https://ntrs.nasa.gov/citations/19950011675
- Rais-Rohani, Masound. 1999. Global-Local Analysis and Optimization of a Composite Civil Tilt-Rotor Wing. Mississippi State Univ. https://ntrs.nasa.gov/citations/19990064496
- Rais-Rohani, Masoud, and Donald Baker. 1994. “Wing Design for a Civil Tilt-Rotor Transport Aircraft: A Preliminary Study.” In 35th Structures, Structural Dynamics, and Materials Conference. AIAA 1994-1469. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1994-1469
- Ramachandran, Krishna Velliyur, and C. Tung. 1992. “Hover Performance Analysis of Advanced Rotor Blades.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f48-2036
- Ramachandran, K., C. Tung, and F. Caradonna. 1989. “The Free-Wake Prediction of Rotor Hover Performance Using a Vortex Embedding Method.” In 27th Aerospace Sciences Meeting. AIAA 1989-638. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-638
- Ramasamy, Manikandan, and J. Gordon Leishman. 2006. “Benchmarking PIV with LDV for Rotor Wake Vortex Flows.” In 24th AIAA Applied Aerodynamics Conference. AIAA 2006-3479. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-3479
- Ramasamy, Manikandan, Mark Potsdam, and Gloria K. Yamauchi. 2015. “Measurements to Understand the Flow Mechanisms Contributing to Tandem-Rotor Outwash.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10100
- Ramasamy, Manikandan, Mark Potsdam, and Gloria K. Yamauchi. 2018. “Measurements to Understand the Flow Mechanisms Contributing to Tandem-Rotor Outwash.” In Annual Forum and Technology Display. https://ntrs.nasa.gov/citations/20180007937
- Ramasamy, Manikandan, and GloriaK. Yamauchi. 2017. “Using Model-Scale Tandem-Rotor Measurements in Ground Effect to Understand Full-Scale CH-47D Outwash.” Journal of the American Helicopter Society 62 (1): 1–14. https://doi.org/10.4050/jahs.62.012004
- Ramnath, R. 1969. “Transition Dynamics of VTOL Aircraft.” In 7th Aerospace Sciences Meeting. AIAA 1969-130. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-130
- Rand, Omri, and Vladimir Khromov. 2004. “Helicopter Sizing by Statistics.” Journal of the American Helicopter Society 49 (3): 300–317. https://doi.org/10.4050/jahs.49.300
- Rand, Omri, and Vladimir Khromov. 2013a. “Compound Helicopter: Insight and Optimization.” In Proceedings of the Vertical Flight Society 69th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/vfs-f69-0103
- Rand, Omri, and Vladimir Khromov. 2013b. “Compound Helicopter: Insight and Optimization.” Journal of the American Helicopter Society 60 (1): 1–12. https://doi.org/10.4050/jahs.60.012001
- Rand, Omri, and Richard J. Peyran. 1999. “The Effect of Design Requirements on Conceptual Tiltrotor Wing Weight.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f55-00063
- Rangacharyulu, M. A. V., and M. J. Moore. 1991. “Flight Vibration Testing of the V-22 Tiltrotor Aircraft.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f47-2015
- Rashidi, Majid, and Timothy Krantz. 1992. Dynamics of a Split Torque Helicopter Transmission. NASA-TM-105681. NASA. https://ntrs.nasa.gov/citations/19920019893
- Rasmussen, Albert L. 1960. “Trends in Navy Turboprop/turboshaft Engine Developments.” In SAE Technical Paper Series, vol. 1. SAE International. https://doi.org/10.4271/600281
- Rath, Tobias, Thomas Richter, Alexander Steinwandel, and Walter Fichter. 2016. “Emulation of Whirl Flutter on a Stable Helicopter Using Trailing Edge Flaps.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0072-2016-11427
- Rathod, Amaratsinh, and Sh Sankarasarma Vemuri. 2026. “Aerodynamic and Aeroacoustic Characterization of a Micro-Scale Shrouded Rotor in Ground Effect.” In 32nd AIAA/CEAS Aeroacoustics Conference (2026). AIAA 2026-3222. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-3222
- Ray, James A. 1983. “The Joint Services Advanced Vertical Lift Aircraft (JVX) Propulsion System.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/831536
- Raymer, Daniel. 1988. “The Impact of VTOL on the Conceptual Design Process.” In Aircraft Design, Systems and Operations Conference. AIAA 1988-4479. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-4479
- Reader, Kenneth R., and Joseph B. Wilkerson. 1976. “Circulation Control Applied to a High Speed Helicopter Rotor.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f32-0004
- Reber, R. R. 1981. “Greenlandair VTOL Transportation Study.” In V/STOL Conference. https://ntrs.nasa.gov/citations/19820033377
- Reber, Ron. 1993. “Civil Tiltrotor Transportation for the 21st Century.” In International Powered Lift Conference. AIAA 1993-4875. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-4875
- Reddinger, Jean-Paul, and Farhan S. Gandhi. 2014. “A Physics-Based Approach to Trim Optimization of an Articulated Slowed-Rotor Compound Helicopter in High-Speed Flight.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0070-2014-9465
- Reddinger, Jean-Paul, and Farhan S. Gandhi. 2016. “Response Surface Estimation of Trim Controls for a Compound Helicopter with Control Redundancy.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0072-2016-11362
- Reddinger, Jean-Paul, and Farhan Gandhi. 2017a. “Neural Network and Machine Learning Allocation of Redundant Controls for Power Optimization on a Compound Helicopter.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12075
- Reddinger, Jean-Paul, and Farhan S. Gandhi. 2017b. “Using Redundant Effectors to Trim a Compound Helicopter with Damaged Main Rotor Controls.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12305
- Reddinger, Jean-Paul, Farhan Gandhi, and Hao Kang. 2018. “Using Control Redundancy for Power and Vibration Reduction on a Compound Helicopter at High Speeds.” Journal of the American Helicopter Society 63 (3): 1–13. https://doi.org/10.4050/jahs.63.032009
- Reddinger, Jean-Paul, Hao Kang, and Farhan Gandhi. 2015. “Performance and Hub Vibrations of an Articulated Slowed-Rotor Compound Helciopter at High Speeds.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10159
- Reddy, N., H. Bartel, and M. Salikuddin. 1989. “Installed Propfan (SR-7L) Far-Field Noise Characteristics.” In 12th Aeroacoustic Conference. AIAA 1989-1056. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-1056
- Reed, V. 1980. “Use of Contingency Ratings on a Subsonic V/STOL Propulsion System.” In Aircraft Systems Meeting. AIAA 1980-1855. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-1855
- Reed, W. H., III. 1965. Propeller-Rotor Whirl Flutter: A State-of- the-Art Review. NASA-TM-X-56678. NASA. https://ntrs.nasa.gov/citations/19660012890
- Reed, W. H., III. 1967. Review of Propeller-Rotor Whirl Flutter. NASA-TR-R-264. NASA. https://ntrs.nasa.gov/citations/19670020798
- Reeder, J. P. 1967. V/STOL Terminal Area Instrument Flight Research. NASA-TM-X-60456. NASA. https://ntrs.nasa.gov/citations/19680017973
- Ren, Yan, and Gecheng Zha. 2024. “2D Fluid-Body Interaction Simulation of CoFlow Jet Deflected Slipstream VTOL Transition Flight.” In AIAA Aviation Forum and Ascend 2024. AIAA 2024-4419. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-4419
- “Representative Operations of V/STOL Aircraft.” 2002. In Dynamics, Control, and Flying Qualities of V/STOL Aircraft. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/5.9781600861758.0005.0012
- Reveles, Nicolas, and Anurag Rajagopal. 2024. “Application of a Novel Stability Method to CFD-Based Whirl Flutter Analysis.” In AIAA SCITECH 2024 Forum. AIAA 2024-1849. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1849
- Reveles, Nicolas, Joseph Schoneman, Cory Rupp, and Eric Blades. 2019. “Utilizing Analytic and Direct Methods for the Verification and Validation of Whirl Flutter Analyses.” In AIAA Scitech 2019 Forum. AIAA 2019-1865. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1865
- Reveles, Nicolas, Parthiv N. Shah, and Adam Weiss. 2024. “An Indirect Stability Method Applied to Whirl Flutter Using Computational Fluid Dynamics Actuator Disc Models.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1367
- Reveles, Nicolas, Christopher I. Van Damme, Joseph Robinson, Matthew Tuman, and Josh Hansen. 2026. “Synthesis of Whirl Flutter Predictions from Multiple Independent Analysis Solvers.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0073
- Reynolds, C., R. Riffel, and S. Ludemann. 1987. “Propfan Propulsion Systems for the 1990’s.” In 23rd Joint Propulsion Conference. AIAA 1987-1729. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-1729
- Rhodes, W. 1969. “Initial Military Flight Tests of the X-22A VSTOL Research Aircraft.” In 3rd Flight Test, Simulation, and Support Conference. AIAA 1969-319. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-319
- Riccardi, F., M. Mamino, M. Pecoraro, and Andrea Ragazzi. 2025. Handling Qualities MTEs Evaluation Methodologies in Preliminary Design of High-Speed Rotorcraft Configurations. https://doi.org/10.4050/sm_handling_2025-5298
- Richardson, Doug. 1959. “A Propulsion Spectrum for VTOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/590289
- Richter, Thomas, Oliver Oberinger, Tobias Rath, and Walter Fichter. 2015. “Investigation of Whirl Flutter Stabilization Using Active Trailing Edge Flaps.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10154
- Riddle, D., R. Innis, J. Martin, and J. Cochrane. 1981. “Powered-Lift Takeoff Performance Characteristics Determined from Flight Test of the Quiet Short-Haul Research Aircraft /QSRA/.” In 1st Flight Test Conference. AIAA 1981-2409. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-2409
- Riesenfeld, E. 1968. “The Evaluation of V/STOL Flight Test Facilities.” In Aircraft Design for 1980’s Operations Meeting. AIAA 1968-206. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1968-206
- Righetti, Antonio, Vincenzo Muscarello, and Giuseppe Quaranta. 2017. “Linear Parameter Varying Models for the Optimization of Tiltrotor Conversion Maneuver.” In Proceedings of the Vertical Flight Society 73rd Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0073-2017-12299
- Rigo, Alberto, Vincenzo Muscarello, Pierangelo Masarati, Giuseppe Quaranta, and Marco Favale. 2019. “Drive Train Modeling Effects on Tiltrotor Aeroelastic Analysis.” In AIAA Scitech 2019 Forum. AIAA 2019-1367. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1367
- Riley, Richard G. 1992. “Civil Tiltrotor Noise Impact Prediction Methodology.” In Vertical Flight Society Forum, vol. 2. https://doi.org/10.4050/vfs-f48-2005
- Rinehart, Stephen. 1970a. “Effects of Modifying a Rotor Tip Vortex by Injection on Downwash Velocities, Noise, and Airloads.” In Proceedings of the Specialists Meeting on Environmental Effects on VTOL Designs - Arlington, Texas 1970. The Vertical Flight Society. https://doi.org/10.4050/sm_env_1970-2544
- Rinehart, Stephen A. 1970b. “Effects of Modifying a Rotor Tip Vortex by Injection on Downwash Velocities, Noise, and Airloads.” Journal of the American Helicopter Society 16 (4): 1–12. https://doi.org/10.4050/jahs.16.48
- Ringland, R., and S. Craig. 1977. “A Survey of Piloting Factors in Fixed-Wing V/STOL Aircraft.” In Guidance and Control Conference. AIAA 1977-1147. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1977-1147
- Riso, Cristina. 2024a. Impact of System Nonlinearities on Output-Based Whirl Flutter Prediction. https://doi.org/10.4050/sm-2024-tvf-5096
- Riso, Cristina. 2024b. “Output-Based Prediction of Whirl Flutter Limit-Cycle Oscillations Considering Multiple Varying Parameters.” In AIAA SCITECH 2024 Forum. AIAA 2024-1847. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1847
- Riso, Cristina. 2025. “Evaluation of Whirl Flutter Prediction Methods for a System with Hardening or Softening Structural Nonlinearities.” Journal of the American Helicopter Society. https://doi.org/10.4050/jahs.70.022001
- Ritter, Alfred Hotchkiss, and Donald Earl Ordway. 1962. “General Airscrew Applications to VTOL Propulsion.” Journal of the American Helicopter Society 7 (3): 3–8. https://doi.org/10.4050/jahs.7.3.3
- Robbins, O. G. 1967. “V/STOL Aircraft Gas Turbine Requirements.” In ASME 1967 Gas Turbine Conference and Products Show. American Society of Mechanical Engineers. https://doi.org/10.1115/67-gt-48
- Robert, D. 2018. “System Level Benefits of a Variable Diameter Rotor System for a Conceptual Tiltrotor Design.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12726
- Roberts, L., and S. B. Anderson. 1977. “Toward a New V/STOL Generation.” Astronautics and Aeronautics 15. https://ntrs.nasa.gov/citations/19780029162
- Roberts, L., and S. B. Anderson. 1981. V/STOL Aircraft and Fluid Dynamics. NASA-TM-81328. NASA. https://ntrs.nasa.gov/citations/19820002156
- Roberts, L., and W. R. Deckert. 1982. Recent Progress in VSTOL Technology. NASA-TM-84238. NASA. https://ntrs.nasa.gov/citations/19820025458
- Roberts, L., W. Deckert, and D. Hickey. 1981. Recent Progress in V/STOL Aircraft Technology. NASA-TM-81281. NASA. https://ntrs.nasa.gov/citations/19810011538
- Robertson, Greta A. 2000. “Flight Demonstration of an Associate System: A Rotorcraft Pilot’s Associate Example.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f56-00049
- Robinson, Dan. 2015. V-22 Osprey Joint Services Advanced Vertical Lift Aircraft (V-22). Defense Technical Information Center. https://doi.org/10.21236/ad1019566
- Robuck, Mark, Joseph Wilkerson, Robert Maciolek, and Dan Vonderwell. 2012. The Effect of Rotor Cruise Tip Speed, Engine Technology and Engine/Drive System RPM on the NASA Large Civil Tiltrotor (LCTR2) Size and Performance. ARC-E-DAA-TN7289. Boeing Co. https://ntrs.nasa.gov/citations/20130014739
- Robuck, Mark, Joseph Wilkerson, Yiyi Zhang, Christopher A. Snyder, and Daniel Vonderwell. 2013. Design Study of Propulsion and Drive Systems for the Large Civil TiltRotor (LCTR2) Rotorcraft. NASA/TM-2013-218102. NASA. https://ntrs.nasa.gov/citations/20140005754
- Rodenbaugh, W. L. 1969. “A Family of Advanced Turboshaft Engines.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f25-019
- Rodenbaugh, W. L., and L. B. Veno. 1965. The Influential Variables of V/STOL Propulsion. https://doi.org/10.4050/sm_vstol_1965-4579
- Rodrigues, F. F., M. Habibnia, and J. Pascoa. 2020. “Novel Propulsion System for VTOL Aircraft Based on Cycloidal Rotors Coupled with Wings.” In Volume 1: Fluid Applications and Systems; Fluid Measurement and Instrumentation. American Society of Mechanical Engineers. https://doi.org/10.1115/fedsm2020-20292
- Rodrigues, Frederico, Mehdi Habibnia, and Jose Pascoa. 2021. “Novel Propulsion System for Vtol Aircrafts Based on Cycloidal Rotors Coupled with Wings.” Preprint, . https://doi.org/10.1115/1.0001689v
- Roelke, R. J., and Steve Zigan. 1972. “Design Studies of Lift Fan Engines Suitable for Use in Civilian VTOL Aircraft.” In ASME 1972 International Gas Turbine and Fluids Engineering Conference and Products Show. American Society of Mechanical Engineers. https://doi.org/10.1115/72-gt-65
- Rogers, Damian, Claudio Punzi, Alberto Angelo Trezzini, and Pierre Abdel Nour. 2022. Multidisciplinary Design of a Complex Tiltrotor Morphing Wing System. https://doi.org/10.4050/sm_2022_cs-1155
- Rogers, Charles, and Dale Reisdorfer. 1993. Civil Tiltrotor Transport Point Design: Model 940A. NASA-CR-191446. NASA. https://ntrs.nasa.gov/citations/19930023045
- Rogo, C., and E. Benstein. 1985. “Variable Cycle Turboshaft Technology for Rotor-Craft of the 90’s.” In 21st Joint Propulsion Conference. AIAA 1985-1278. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-1278
- Rohit, Ram V. 2024. “Design, Analysis, and Simulation of the Hybrid Tri-Copter VTOL Tilt-Rotor UAV.” Revista Electronica de Veterinaria: 507–21. https://doi.org/10.69980/redvet.v24i4.1345
- Rohrbach, C., F. B. Metzger, D. M. Black, and R. M. Ladden. 1982. Evaluation of Wind Tunnel Performance Testings of an Advanced 45 Deg Swept 8-Bladed Propeller at Mach Numbers from 0.45 to 0.85. NASA-CR-3505. NASA. https://ntrs.nasa.gov/citations/19820011304
- Roiati, Riccardo, Tyler Rice, Brock Steinfeldt, Jasper Nitzsche, and Richard Anderson. 2024. “Performance Analysis of a High-Speed Tiltrotor Aircraft Featuring VerdeGo Aero’s VH-5 Hybrid-Electric Turbofan Engine.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1235
- Rolls, L., and K. Aoyagi. 1977. “Experimental Investigations of Thrust Vectoring Systems for VTOL Aircraft.” In 13th Propulsion Conference. AIAA 1977-805. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1977-805
- Rolls, L., H. Quigley, and R. Perkins Jr. 1976. “Review of V/STOL Lift/cruise Fan Technology.” In Aircraft Systems and Technology Meeting. AIAA 1976-931. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1976-931
- Romander, Ethan. 2006. “3-D Navier-Stokes Analysis of Blade Root Aerodynamics for a Tiltrotor Aircraft in Cruise.” In AHS Vertical Lift Aircraft Design Confererence. https://ntrs.nasa.gov/citations/20070017932
- Romander, Ethan A., Alyna Anderson, Gloria K. Yamauchi, et al. 2026. “Outwash Test Results for a Single Rotor in Hover (Presentation Only).” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0334
- Romander, Ethan, Mark Betzina, Mark Silva, Alan Wadcock, and Gloria Yamauchi. 2007. “Investigating Tiltrotor Formation Flight via 1/48-Scale Wind Tunnel Experiment.” In AHS 62nd Annual Forum. https://ntrs.nasa.gov/citations/20070017933
- Rosas Cordova, Jose Alfredo, Diana Hernandez-Alcantara, Luis Arturo Reyes Osorio, and Luis Amezquita-Brooks. 2025. “Design, Manufacture and Testing of a Low-Cost Tilt-Rotor UAV: A Practical Development Case.” Aircraft Engineering and Aerospace Technology 98 (2): 209–37. https://doi.org/10.1108/aeat-05-2025-0168
- Rosenstein, Harald. 1989. “Conceptual Design of an Advanced V/STOL Special Electronic Mission Aircraft.” In Proceedings of the The Rotary Wing Aircraft Conceptual Design Process - Atlanta, Georgia, 1989. The Vertical Flight Society. https://doi.org/10.4050/sm_rotary_1989-2147
- Rosenstein, H., and R. Clark. 1986. “Aerodynamic Development of the V-22 Tilt Rotor.” In Aircraft Systems, Design and Technology Meeting. AIAA 1986-2678. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-2678
- Rosenstein, H., M. A. McVeigh, and P. A. Mollenkof. 1973. V/STOL Tilt Rotor Aircraft Study Mathematical Model for a Real Time Simulation of a Tilt Rotor Aircraft (Boeing Vertol Model 222), Volume 8. NASA-CR-114601. NASA. https://ntrs.nasa.gov/citations/19730023215
- Rosenthal, G. 1982. “NGT Sub-Scale Flight Demonstrator — A Cost-Effective Approach to Aircraft Development.” In SAE Technical Paper Series, vol. 1. SAE International. https://doi.org/10.4271/821341
- Rosenthal, Gordon, Norris Krone Jr., and Richard Carns. 1988. “A Special Mission V/STOL Transport Aircraft Study.” In Aircraft Design, Systems and Operations Conference. AIAA 1988-4477. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-4477
- Roth, S. P., R. J. Miller, and J. Mihaloew. 1980. “Future Challenges in V/STOL Flight Propulsion Control Integration.” In Society of Automotive Engineers. https://ntrs.nasa.gov/citations/19810049766
- Rothaupt, Benjamin, Walter Fichter, and Benedikt Grebing. 2026. “Design, Implementation, and Flight Testing of a Stability Augmentation System for Coaxial Ultralight Rotorcraft.” Preprint, Research Square. https://doi.org/10.21203/rs.3.rs-8745267/v1
- Rothhaar, Paul M., Patrick C. Murphy, Barton J. Bacon, et al. 2014. “NASA Langley Distributed Propulsion VTOL TiltWing Aircraft Testing, Modeling, Simulation, Control, and Flight Test Development.” In 14th AIAA Aviation Technology, Integration, and Operations Conference. AIAA 2014-2999. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2014-2999
- “Rotor Downwash Modeling.” 2018. In Introduction to Helicopter and Tiltrotor Flight Simulation, Second Edition. American Institute of Aeronautics and Astronautics, Inc. https://doi.org/10.2514/5.9781624105135.0263.0300
- Rotor in Vertical Flight: Momentum Theory and Wake Analysis. 2011. Wiley. https://doi.org/10.1002/9781119994114.ch2
- Rottach, M., C. Gerada, T. Hamiti, and P. W. Wheeler. 2012. “Fault-Tolerant Electrical Machine Design within a Rotorcraft Actuation Drive System Optimisation.” In 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012). IET. https://doi.org/10.1049/cp.2012.0247
- Rovedatti, Giulia, Pietro Sabato, Cristian Lilliu, Matteo Pecoraro, Alan Loi, and Valerio Rossetti. 2026. “Fast Rotorcraft Sizing Principles and Requirements Impact: Focus on Tiltrotor Architecture.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0214
- Rovere, Federico, Rene Steijl, and George N. Barakos. 2020. “CFD Analysis of a Micro Rotor in Ground Effect.” In AIAA Scitech 2020 Forum. AIAA 2020-1793. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-1793
- Rowe, Brian Hunter. 1965. “The Design and Development of the CJ610 Turbojet and the CF700 Turbofan Engines for Use in Business Jet Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/650381
- Rowell, William J. 2012. Whole of Government Approach to Personnel Recovery. Defense Technical Information Center. https://doi.org/10.21236/ada561846
- “RS 360 Turboshaft Engine.” 1972. Aircraft Engineering and Aerospace Technology 44 (6): 9–11. https://doi.org/10.1108/eb034913
- Russell, Carl R., and Cecil W. Acree. 2018. “Modal Test and Analysis of the NASA Tiltrotor Test Rig.” In AHS Specialist’’s Conference on Aeromechanics Design for Transformative Vertical Flight. https://ntrs.nasa.gov/citations/20190001481
- Russell, Carl, and Pierre-Marie Basset. 2015. “Conceptual Design of Environmentally Friendly Rotorcraft: A Comparison of NASA and ONERA Approaches.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10119
- Russell, Carl, and Wayne Johnson. 2012. “Conceptual Design and Performance Analysis for a Large Civil Compound Helicopter.” In AHS Future Vertical Lift Aircraft Design Conference. https://ntrs.nasa.gov/citations/20120011591
- Russell, Carl, and Wayne Johnson. 2013a. “Application of Climate Impact Metrics to Civil Tiltrotor Design.” In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. AIAA 2013-1087. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2013-1087
- Russell, Carl, and Wayne R. Johnson. 2013b. “Exploration of Configuration Options for a Large Civil Compound Helicopter.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-0159
- Russell, Carl, and Wayne Johnson. 2014. Conceptual Design of Vertical Lift Aircraft with Future Propulsion System Architectures. https://doi.org/10.4050/sm_2014_tvf-2149
- Russo, Federica. 2026. “Shaping the Future through the past – the Beginning of Leonardo Helicopters’ Journey in Convertible Rotorcraft Design.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0109
- Rutherford, John, and Steven Bass. 1992. “Advanced Technology Tilt Wing Study.” In Guidance, Navigation and Control Conference. AIAA 1992-4237. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-4237
- Rutherford, John W., Steven M. Bass, and Steven D. Larsen. 1993a. “Canard Rotor/Wing: A Revolutionary High-Speed Rotorcraft Concept.” In Aerospace Design Conference. AIAA 1993-1175. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-1175
- Rutherford, John, and Robert Fitzpatrick. 1991. “High-Speed Rotorcraft Propulsion.” In 27th Joint Propulsion Conference. AIAA 1991-2147. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-2147
- Rutherford, John, Matthew Orourke, Christopher Martin, Marc Lovenguth, and Clark Mitchell. 1991. Technology Needs for High-Speed Rotorcraft. NASA-CR-177578. NASA. https://ntrs.nasa.gov/citations/19910013823
- Rutledge, Charles K., Charles D. Coffen, and Albert R. George. 1991. A Comparative Analysis of XV-15 Tiltrotor Hover Test Data and WOPWOP Predictions Incorporating the Fountain Effect. NASA-CR-189455. NASA. https://ntrs.nasa.gov/citations/19920002774
- Rysdyk, Rolf, Anthony Calise, Robert Chen, Rolf Rysdyk, Anthony Calise, and Robert Chen. 1997. “Nonlinear Adaptive Control of Tiltrotor Aircraft Using Neural Networks.” In 1997 World Aviation Congress. AIAA 1997-5613. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1997-5613
- S-12 Powered Lift Propulsion Committee. 1997. Instrumentation Requirements for Turboshaft Engine Performance Measurements. https://doi.org/10.4271/arp1217a
- S-12 Powered Lift Propulsion Committee. 2023. Air Bleed Objective for Rotorcraft Turbine Engines. https://doi.org/10.4271/air984d
- S-12 Powered Lift Propulsion Committee. 2024. Rotorcraft Turboshaft Engine Idle Power Scheduling. https://doi.org/10.4271/air4121
- Saetti, Umberto. 2025a. “Dynamic Inversion Flight Control Laws for Automatic Transition of Tilt-Rotor/Wing Aircraft.” Journal of the American Helicopter Society. https://doi.org/10.4050/jahs.70.032005
- Saetti, Umberto. 2025b. “Redundant Control Allocation Strategies for the RACER Compound Rotorcraft Configuration.” Journal of the American Helicopter Society 70 (4): 1–18. https://doi.org/10.4050/jahs.70.042007
- Saetti, Umberto, and Batın Buğday. 2023. “Tiltrotor Simulations with Coupled Flight Dynamics, State-Space Aeromechanics, and Aeroacoustics.” Journal of the American Helicopter Society 69 (1): 1–18. https://doi.org/10.4050/jahs.69.012003
- Safi’i, Imam, Achmad C. Asyary, and Ony Arifianto. 2021. “Transition Flight Simulation of a Hybrid VTOL Fixed-Wing Drone.” In AIP Conference Proceedings, vol. 2366. AIP Publishing. https://doi.org/10.1063/5.0061425
- Sagaga, Jared Delatorre Wakefield, and Seongkyu Lee. 2023. “Acoustic Predictions for Side-by-Side Rotor with Ground Effect.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-17947
- Sagaga, Jared, and Seongkyu Lee. 2025. “High-Fidelity Numerical Simulations of Side-by-Side Rotor with Ground Effect.” Journal of the American Helicopter Society. https://doi.org/10.4050/jahs.70.032004
- Sagerser, D., and S. Ludemann. 1985. “Large-Scale Advanced Propfan (LAP) Program Progress Report.” In 21st Joint Propulsion Conference. AIAA 1985-1187. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-1187
- Saijo, Takashi, Balakrishnan Ganesh, A. Huang, and Narayanan Komerath. 2003. “Development of Unsteadiness in a Rotor Wake in Ground Effect.” In 21st AIAA Applied Aerodynamics Conference. AIAA 2003-3519. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-3519
- Saito, Shigeru, Hiroshi Kobayashi, Yasuhiro Wada, and Yuichi Matsuo. 1987. “Numerical Approach of Advanced Turboprop with Three-Dimensional Euler Equations.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/872448
- Salahudden, Salahudden, Henil Agrawal, Aditya Karnam, Anirban Roy, and Abhishek Singh. 2024. “Flight Dynamics and Control of Tricopter VTOL and Tilt Rotor Transition to Fixed Wing.” In AIAA Aviation Forum and Ascend 2024. AIAA 2024-4513. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-4513
- Salkind, Mj. 1973. “VTOL Aircraft.” In Applications of Composite Materials. ASTM International100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. https://doi.org/10.1520/stp34130s
- Samant, Sanjay Singh, and Robin B. Gray. 1977. “A Semi-Empirical Correction for the Vortex Core Effect on Hovering Rotor Wake Geometries.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f33-002
- Samar, Raza, M. Anwar Mughal, and Muhammad Shahzad. 2003. “Linearized Flight Dynamics of Vertical Lift-off High Speed Vehicles.” In AIAA Modeling and Simulation Technologies Conference and Exhibit. AIAA 2003-5462. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-5462
- Sambell, K. 1971. “Application of the Low Disc-Loading Proprotor to a Series of Aircraftfor the Short-Haul Market.” In 3rd Aircraft Design and Operations Meeting. AIAA 1971-781. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1971-781
- Sambell, K. W. 1976. Conceptual Design Study of 1985 Commercial Tilt Rotor Transports. Volume 3: STOL Design Summary. NASA-CR-2690. NASA. https://ntrs.nasa.gov/citations/19760015087
- Sanapo, Carlo, Marco Castaldi, Ignacio Mayo Yague, Jacques Demolis, and Frank Eulitz. 2024. “Aerodynamic Characterization of an Industrial Inlet Particle Separator for Turboshaft and Turboprop Engines.” In Volume 1: Aircraft Engine. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2024-127364
- Sanders, K. 1964. “Optimum Vertifan Concepts for Tactical V/stol Aircraft.” In Military Aircraft Systems and Technology Meeting. AIAA 1964-776. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-776
- Sanderson, Kenneth C. 1965. “The X-15 Flight Test Instrumentation.” In Flight Test Instrumentation. Elsevier. https://doi.org/10.1016/b978-0-08-011074-5.50017-8
- Sankar, Lakshmi N., Ritu Marpu, Nathan S. Hariharan, and T. Alan Egolf. 2015. “Assessment of Planform Effects on Rotor Hover Performance.” In 53rd AIAA Aerospace Sciences Meeting. AIAA 2015-1716. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1716
- Sankar, N., B. Wake, and S. Lekoudis. 1985. “Solution of the Unsteady Euler Equations for Fixed and Rotor Wing Configurations.” In 23rd Aerospace Sciences Meeting. AIAA 1985-120. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-120
- SantaMaria, O. L., J. B. Wellman, D. A. Conner, and C. K. Rutledge. 1991. Tiltrotor Acoustic Flight Test: Terminal Area Operations. NASA Langley Research Center. https://ntrs.nasa.gov/citations/20040121157
- Santos, João P. T. P., Gabriel Araujo, and Flávio Marques. 2025. “Nonlinear Energy Sink for Passive Mitigation of Propeller Whirl Flutter.” Preprint, . https://doi.org/10.2139/ssrn.5343060
- Santos Martins Nunes, Jessica, and Weihua Su. 2024. “Nonlinear MPC of Tiltrotor Aircraft for Trajectory Stabilization with Rotor and Control Surface Failure.” In AIAA SCITECH 2024 Forum. AIAA 2024-0518. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-0518
- Sargent, Pierson B., and Willem A. Anemaat. 2018. “Benchmarking a Robust Panel Code for Ducted Fan VTOL Aircraft Design.” In 2018 Applied Aerodynamics Conference. AIAA 2018-4212. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-4212
- Sarker, Rippon, Pedram Hashem Dabaghian, Atanu Halder, and Raman Goyal. 2026. A Machine Learning Framework for Fault Detection, Isolation, and Severity Prediction of Autonomous VTOL Aircraft. https://doi.org/10.4050/sm-2026-vlada-5215
- Sartorius, Sky. 2011. A Tool for Rotorcraft Pre-Design Sizing. https://doi.org/10.4050/vfs-f67-000015
- Savino, Alberto, Alessandro Cocco, Andrea Zanoni, et al. 2022. “Design and Optimization of Innovative Tiltrotor Wing Control Surfaces through Coupled Multibody: Mid-Fidelity Aerodynamics Simulations.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0078-2022-1174
- Sawron, Md Sadat Shahrier. 2026. “Standardized Mid-Fidelity Aerodynamic Comparison of Four Tiltrotor eVTOL Configurations Using SUAVE and VSPAero.” Preprint, . https://doi.org/10.31224/8181
- Scaramal, Mariano, Joseph F. Horn, Tom Berger, and Derek F. Bridges. 2026. “Extremum-Seeking Control for Enhanced Fuel Efficiency of Coaxial-Compound Rotorcraft.” Journal of the American Helicopter Society 71 (3): 1–16. https://doi.org/10.4050/jahs.71.032007
- Schaefer, Carl G. 2016. LightningStrike VTOL X-Plane Program. https://doi.org/10.4050/sm_2016_tvf-3360
- Schafer, Sylvie, Jared K. Cooper, and Joseph F. Horn. 2015. “Flight Test Measurement of Ship Airwake Disturbances Using Small-Scale Rotorcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10282
- Schank, Troy C. 2006. “The McDonnell Aircraft Corporation Tip-Jet, Convertiplane Programs.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f62-127
- Schank, Troy C. 2023. High Speed Rotorcraft Propulsion Configuration. https://patents.google.com/patent/US11577831B2/en
- Schank, Troy Cyril, Carlos Alexander Fenny, Andrew Maresh, and Chyau-Song Tzeng. 2020. Tilrotor Aircraft Having Rotary and Non Rotary Flight Modes. https://patents.google.com/patent/US10526068B2/en
- Schank, Troy Cyril, Andrew Ryan Maresh, and Chyau-Song Tzeng. 2022. Blade Fold Mechanism. https://patents.google.com/patent/US11235858B2/en
- Schank, Troy, Hong Xin, and Albert Brand. 2025. “Full Scale Stop-Fold Transition Demonstration on a High-Speed Test Track.” In Proceedings of the Vertical Flight Society 81st Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0081-2025-0075
- Schatzman, Natasha L., and Carlos Malpica. 2019. “Acoustic Testing of the Tiltrotor Test Rig in the National Full-Scale Aerodynamics Complex 40- by 80-Foot Wind Tunnel.” In Annual Forum & Technology Display. https://ntrs.nasa.gov/citations/20190025116
- Scheu, Thomas, Jonas Koch, Agnes Poks, and Michael Weigand. 2024. “Dynamic Behaviour of a Rotorcraft Main Rotor System with Variable Speed.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1368
- Scheu, Thomas, Agnes Poks, Florian Donner, and Michael Weigand. 2023. “Dynamic Simulation of a Rotorcraft Main Transmission with Continuous Variable Ratio.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18148
- Schleicher, David. 1993. “Advanced Civil Tiltrotor Design Optimization and Issues.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f49-2013
- Schleicher, David R., James D. Phillips, and Kevin B. Carbajal. 1993. Design Optimization of High-Speed Proprotor Aircraft. NASA-TM-103988. NASA. https://ntrs.nasa.gov/citations/19940021648
- Schmalzel, M., P. Varghese, and I. Wygnanski. n.d. “Steady and Oscillatory Flow Control Tests for Tilt Rotor Aircraft.” In Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-540-71439-2_12
- Schmidt, Marvin F. 1985. “Propeller Design Point Calculation Method for Comparing Turbofan/Propfan Engine Performance.” In Volume 1: Aircraft Engine; Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/85-igt-150
- Schmidt, S. A., and A. W. Linden. 1972. Rotor Systems Research Aircraft Predesign Study. Volume 2: Conceptual Study Report. NASA-CR-112153. NASA. https://ntrs.nasa.gov/citations/19720025365
- Schmitz, Fredric H., D. A. Boxwell, and C. Rande Vause. 1977. “High-Speed Helicopter Impulsive Noise.” Journal of the American Helicopter Society 22 (4): 28–36. https://doi.org/10.4050/jahs.22.28
- Schneider, John. 1989. “Advanced V/STOL Attack Aircraft Design/operations Trade-off.” In Aircraft Design and Operations Meeting. AIAA 1989-2116. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2116
- Schneider, John, and Joseph Wilkerson. 1990. “Advanced Rotorcraft V/STOL: Technology Needs for High-Speed Rotorcraft.” In Aircraft Design, Systems and Operations Conference. AIAA 1990-3298. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3298
- Schrage, Daniel, and David Arterburn. 2016. “Future Vertical Lift Airworthiness Certification: Should It Be Based on a Civil Aviation Functional Safety Certification Standard?” In Proceedings of the Vertical Flight Society 72nd Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0072-2016-11533
- Schrage, Daniel P., and Srujal Patel. 2019. “Vertical Lift Aircraft Design through the Georgia Tech Integrated Product and Process Development Approach for over the past 30 Years.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14732
- Schrage, Daniel P., Kaydon A. Stanzione, and Apinut Sirirojvisuth. 2018. “Assessing the Impact of Hybrid Distributed Electric Propulsion on VTOL Aircraft Design and System Effectiveness.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12675
- Schrage, Daniel P., and Alex Van. 2015. “A DAVBA Approach for Complex VTOL Aircraft Development.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10269
- Schroers, L. G. 1982. Dynamic Structural Aeroelastic Stability Testing of the XV-15 Tilt Rotor Research Aircraft. NASA-TM-84293. NASA. https://ntrs.nasa.gov/citations/19830008078
- Schroers, Laurel G. 1989. “Development of the XV-15 Tiltrotor Research Aircraft: Lessons Learned.” In National Technical Specialists’’ Meeting on Tactical V/STOL. https://ntrs.nasa.gov/citations/19900051485
- Schroers, Laurel G., James A. Weiberg, Roger L. Marr, and Sheppard Blackman. 1979. “Wind Tunnel and Flight Test of the XV-15 Tilt Rotor Research Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f35-052
- Schwartz, Alan W., and Ernest O. Rogers. 1987. “Analysis of a Fixed-Pitch X-Wing Rotor Employing Lower Surface Blowing.” In NASA. Ames Research Center Proceedings of the Circulation-Control Workshop, 1986. https://ntrs.nasa.gov/citations/19880008218
- Schwartz, R., and J. Shearer. 1964. “Control Display Subsystem Requirements for High Performance V/stol Aircraft.” In Military Aircraft Systems and Technology Meeting. AIAA 1964-773. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-773
- Schwarz, Clemens, André Bauknecht, Claus Wolf, Alexander Coyle, and Markus Raffel. 2019. “A Full-Scale Rotor-Wake Investigation of a Free-Flying Helicopter in Ground Effect Using BOS and PIV.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14515
- Schwarz, Clemens, André Bauknecht, C. Christian Wolf, Alexander Coyle, and Markus Raffel. 2020. “A Full-Scale Rotor-Wake Investigation of a Free-Flying Helicopter in Ground Effect Using BOS and PIV.” Journal of the American Helicopter Society 65 (3): 1–20. https://doi.org/10.4050/jahs.65.032007
- Schwinn, Dominik B., Peter Weiand, and M. Buchwald. 2020. “Structural Sizing of a Rotorcraft Fuselage Using an Integrated Design Approach.” Journal of the American Helicopter Society 65 (4): 1–12. https://doi.org/10.4050/jahs.65.042008
- Scientific and Technical Information Division. 1966. Conference on V/STOL and STOL Aircraft. NASA-SP-116. NASA. https://ntrs.nasa.gov/citations/19660015317
- Scoppe, Frank E. 1973. Advanced Torque Measurement Systems Technique for Aircraft Turboshaft Engines. Defense Technical Information Center. https://doi.org/10.21236/ad0771965
- Scott, Mark. 1991a. “Summary of Technology Needs for High Speed Rotorcraft Study.” In 27th Joint Propulsion Conference. AIAA 1991-2148. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-2148
- Scott, Mark W. 1991b. Technology Needs for High Speed Rotorcraft (2). NASA-CR-177590. NASA. https://ntrs.nasa.gov/citations/19910018854
- Scott, Robert J. 2017. “Historical Trends in Turboshaft Engine Procurement Cost.” Journal of the American Helicopter Society 62 (3): 1–9. https://doi.org/10.4050/jahs.62.032011
- Scott, Robert, and Daniel P. Schrage. 2012. A Framework for Cost-Benefit Analysis of Tiltrotor Aircraft. https://doi.org/10.4050/vfs-f68-000270
- Scott, Robert, Robert Vocke, and Manas S. Khurana. 2019. “Conceptual Design and Assessment of a Light Multirole Rotorcraft Using Uncertainty Quantification.” In AIAA Scitech 2019 Forum. AIAA 2019-0558. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-0558
- Secretary Of The Air Force Washington Dc. 2000. Combat Search and Rescue Air Force Doctrine Document 2-1.6 Compliments Joint Pub 3-50.2, 3-50.21, 3-50.3. Defense Technical Information Center. https://doi.org/10.21236/ada407249
- Sedivy, Dean G. 1992. Bureaucracies at War: The V-22 Osprey Program. Defense Technical Information Center. https://doi.org/10.21236/ada262451
- Seery, Michael E. 1969. “Convertible Fan/shaft Engines.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f25-021
- Sefic, W., and W. Cutler. 1986. “X-29A Advanced Technology Demonstrator Program Overview.” In 3rd Flight Testing Conference and Technical Display. AIAA 1986-9727. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-9727
- Segner, D. 1965. “XH-51A Compound Helicopter Design and Development. xH-51A Compound Helicopter Design and Development.” In Aircraft Design and Technology Meeting. AIAA 1965-757. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1965-757
- Segner, D. 1967. “Flight Tests of the XH-51A Compound Helicopter.” In Simulation and Support Conference. AIAA 1967-262. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1967-262
- Sellers, J. F., A. N. Baez, and George A. Bobula. 1982. Army/NASA Small Turboshaft Engine Digital Controls Research. https://doi.org/10.4050/sm_prop_1982-1825
- Sellers, J., C. Hart, and J. Mihaloew. 1977. “Analysis of Control Concepts for Gas and Shaft-Coupled V/STOL Aircraft Lift Fan Systems.” In V/STOL Conference. AIAA 1977-611. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1977-611
- Semelka, Andrew, and Juergen Rauleder. 2026. “Experimental Investigation of Propeller–Wing Interactions during Dynamic Tiltrotor Conversion Maneuver.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0301
- Sener, Eralp, Isil Yazar, Gurhan Ertasgin, and Hasan Yamik. 2020. “Baseline Architecture Design for a Turboelectric Distributed Propulsion System Using Single Turboshaft Engine Operational Scenario.” International Journal of Turbo & Jet-Engines 40 (2): 147–57. https://doi.org/10.1515/tjj-2020-0041
- Serafini, J., H. Neumann, and J. Sullivan. 1981. “Laser-Velocimeter Flow-Field Measurements of an Advanced Turboprop.” In 17th Joint Propulsion Conference. AIAA 1981-1568. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-1568
- Settle, Ben, and Thomas E. Wise. 2000. “Bell Eagle Eye TR-911X: Tiltrotor Unmanned Aerial Vehicle: Recent Developments, Autoland Integration, and Flight Test Demonstrations.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f56-00014
- Seung, Myeonghun, Sanghyuck Han, Jongchul Kim, and Hyeon Cheol Gong. 2017. “Development of the Multi-Propeller Based Attitude Control Method for VTOL Type Compound Aircraft.” Journal of the Korean Society for Aeronautical & Space Sciences 45 (6): 455–62. https://doi.org/10.5139/jksas.2017.45.6.455
- Seznec, Marc, and Jean Grégoire Ivanoff. 2022. “RACER Compound Helicopter: Operational Wireless FTI Data Transfer from ROTOR’s up to Fuselage.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0078-2022-1171
- Shahjahan, Shahfiq, and Vivek Ahuja. 2026. “Hover Predictions on Various Rotor Designs Using Viscous Surface-Vorticity Compressible-Flow Panel Method.” In AIAA AVIATION 2026 Forum. AIAA 2026-4605. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-4605
- Shahmiri, Farid. 2017. “Twin-Rotor Hover Performance Examination Using Overlap Tests.” Aircraft Engineering and Aerospace Technology 89 (1): 155–63. https://doi.org/10.1108/aeat-02-2015-0032
- Shane, Douglas. 1992. “Agile Responsive Effective Support: Design and Testing of the ARES Concept Demonstrator Aircraft.” In Aerospace Design Conference. AIAA 1992-1038. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-1038
- Shang, Yiman. 2023. “The Latest Development of Turboshaft Engines.” Highlights in Science Engineering and Technology 71: 268–75. https://doi.org/10.54097/hset.v71i.12709
- Shankar, Shivani, Vachaspathy Polepeddi, Pratulya Rajan, Siddhant Desai, and Henry H. Vu. 2025. “Numerical Studies of the Hover Validation and Baseline Rotor.” In AIAA SCITECH 2025 Forum. AIAA 2025-2025. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-2025
- Sharma, Tanuj, Djamel Rezgui, and Branislav Titurus. 2026. “Experimental and Numerical Investigation of Rotor-Structure Dynamic Interactions in a Flexible Rotor-Wing Demonstrator.” Preprint, . https://doi.org/10.2139/ssrn.6713388
- Shattuck, Colman, and Jon Young. 1993. “Modern Propeller Systems for Advanced Turboprop Aircraft.” In 29th Joint Propulsion Conference and Exhibit. AIAA 1993-1846. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-1846
- Sheldon, Jeremy S., David Kasper, and Mark Davis. 2014. “A Multilayered Approach for Enhancing Rotorcraft Drive System Diagnostics.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0070-2014-9530
- Shelts, Kelly, and Natasha Schatzman. 2020. “Acoustic Testing of the Bell 699 Rotor on the Tiltrotor Test Rig (TTR) in the National Full-Scale Aerodynamics Complex 40- by 80- Foot Wind Tunnel in Conversion and Airplane Configuration.” In Transformative Vertical Flight 2020. https://ntrs.nasa.gov/citations/20200000541
- Shen, Jinwei, and Jennifer Baggett. 2024. “Comparison between Gimballed and Hingeless Tiltrotor Whirl Flutter Stability with Multibody Dynamics Analyses.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1353
- Sheng, Hanlin, Tianhong Zhang, and Wei Jiang. 2016. “Full-Range Mathematical Modeling of Turboshaft Engine in Aerospace.” International Journal of Turbo & Jet-Engines 33 (4). https://doi.org/10.1515/tjj-2015-0033
- Sheridan, Philip F. 1978. Interactional Aerodynamics of the Single Rotor Helicopter Configuration. Volume V. Harmonic Analyses of Hub Wake. Defense Technical Information Center. https://doi.org/10.21236/ada063245
- Sheridan, A. 1985. “Study of Turbine Bypass Remote Augmentor Lift System for V/STOL Aircraft.” In Aircraft Design Systems and Operations Meeting. AIAA 1985-3086. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-3086
- Shimizu, Tomofumi, and Masafumi Miwa. 2018. “Transition Control of Quad Tilt Rotor Type VTOL.” Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018 (0): 1P1-A07. https://doi.org/10.1299/jsmermd.2018.1p1-a07
- Shimizu, Tomofumi, and Masafumi Miwa. 2019. “Transition Flight Control of Quad Tilt Rotor Type VTOL.” Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019 (0): 1P2-O04. https://doi.org/10.1299/jsmermd.2019.1p2-o04
- Shimizu, Tomofumi, and Masafumi Miwa. 2020. “Horizontal Flight Experiment of Four-Tilt Rotor Type VTOL.” Proceedings of Conference of Chugoku-Shikoku Branch 2020.58 (0): 11c5. https://doi.org/10.1299/jsmecs.2020.58.11c5
- Shin, SangJoon, Kunhyuk Kong, and Junhee Park. 2026. “Preliminary Design and Characteristics of a Tiltrotor Aircraft Nacelle Utilizing a Tilt-Rotor-Only Mechanism.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0096
- Shinozuka, Atsushi, Shota Taniguchi, Kanako Yasue, Ryota Fukuchi, and Akira Oyama. 2024. “Aerodynamic Analysis of Tandem Tilt-Wing eVTOL Aircraft in Cruise and Transition Flight.” In AIAA SCITECH 2024 Forum. AIAA 2024-2312. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-2312
- Shovlin, M. D., and B. J. Gambucci. 1978. Effect of High Lift Flap Systems on the Conceptual Design of a 1985 Short-Haul Commercial STOL Tilt Rotor Transport. NASA-TM-78474. NASA. https://ntrs.nasa.gov/citations/19780013151
- Shubert, Martin, and Mike Jones. 2025. Preliminary Findings from FAA Sponsored Flight Tests of Handling Qualities Task Elements for VTOL Aircraft. https://doi.org/10.4050/sm_handling_2025-5291
- Siller, U., G. Kröger, T. Moser, and S. Hediger. 2014. “Towards a Highly Efficient Small Scale Turboshaft Engine: Part II — Aero-Mechanical Turbine Design and Optimization.” In Volume 2B: Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2014-26320
- Silva, Natássya Barlate Floro da. n.d. “Development of an Autonomous Unmanned Aerial Vehicle Specification of a Fixed-Wing Vertical Takeoff and Landing Aircraft.” PhD diss., Universidade de São Paulo. https://doi.org/10.11606/t.55.2018.tde-16102018-100220
- Silva, Christopher J., and Wayne Johnson. 2021. “Practical Conceptual Design of Quieter Urban VTOL Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16739
- Silva, Christopher, Wayne Johnson, and Eduardo Solis. 2018. “Multidisciplinary Conceptual Design for Reduced-Emission Rotorcraft.” In AHS Specialists on Aeromechanics Design for Transformative Vertical Flight. https://ntrs.nasa.gov/citations/20180001228
- Silva, Mark, and Navair. 2011. CH-47D Tandem Rotor Outwash Survey. https://doi.org/10.4050/vfs-f67-000161
- Silva, Mark, Alan Wadcock, Mark Betzina, Ethan Romander, and Gloria Yamauchi. 2006. “Investigating Tiltrotor Formation Flight via 1/48-Scale Wind Tunnel Experiment.” In Proceedings of the Vertical Flight Society Forum 62 - Phoenix, AZ 2006. The Vertical Flight Society. https://doi.org/10.4050/vfs-f62-222
- Silva, Christopher, Hyeonsoo Yeo, and Wayne R. Johnson. 2010. “Design of a Slowed-Rotor Compound Helicopter for Future Joint Service Missions.” In American Helicopter Society Aeromechanics Specialists Conference. https://ntrs.nasa.gov/citations/20100024364
- Silva-Martinez, Jackelynne P., Woobong Lee, and Andrew Boshinski. 2015. “Advanced Vertical Lift Aircraft Demonstrator: Design for Certification of a Hover Lift-Drive System.” In 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2015-0974. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-0974
- Sim, Ben, and A. George. 1993a. “A Study of Propfan Propagation Noise.” In 31st Aerospace Sciences Meeting. AIAA 1993-602. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-602
- Sim, Ben Wel-C., and Albert R. George. 1993b. A Survey of Propfan Noise Propagation at Cruise. ISSN: 0736-2935. Cornell Univ. https://ntrs.nasa.gov/citations/19950058507
- Simmons, Benjamin M. 2026. “Subscale Tiltrotor eVTOL Aircraft Dynamic Modeling, Flight Control Software Development, and Testing Progress.” In AIAA Hampton Roads Section Lunch and Learn Technical Seminar. https://ntrs.nasa.gov/citations/20260003234
- Simmons, Benjamin M., and Kasey A. Ackerman. 2026. “System Identification for a Subscale Tiltrotor eVTOL Aircraft from Hover Flight-Test Data.” In AIAA SCITECH 2026 Forum. AIAA 2026-2088. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-2088
- Simmons, Benjamin M., Kasey A. Ackerman, Garrett D. Asper, et al. 2025b. “Subscale Tiltrotor eVTOL Aircraft Dynamic Modeling and Flight Control Software Development.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0161
- Simmons, Gray, Andrew R. Kreshock, Robert Thornburgh, Cristina Riso, and Martin K. Sekula. 2025a. “Experimental Amplitude-Dependent Characterization of the TiltRotor Aeroelastic Stability Testbed.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0109
- Simmons, Gray, Andrew R. Kreshock, Robert Thornburgh, Martin K. Sekula, and Cristina Riso. 2026. “Experimental Amplitude-Dependent Characterization of the TiltRotor Aeroelastic Stability Testbed.” Journal of the American Helicopter Society 71 (2): 1–19. https://doi.org/10.4050/jahs.71.022006
- Simmons, Benjamin M., and Patrick C. Murphy. 2021. “Wind Tunnel-Based Aerodynamic Model Identification for a Tilt-Wing, Distributed Electric Propulsion Aircraft.” In AIAA Scitech 2021 Forum. AIAA 2021-1298. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-1298
- Simmons, Gray, and Cristina Riso. 2026. “Amplitude-Dependent Analysis of Whirl Flutter Test Data of the Maryland Tiltrotor Rig.” In Proceedings of the Vertical Flight Society 82nd Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0082-2026-0059
- Simon, Donald L., and Jonathan S. Litt. 2007. Automated Power Assessment for Helicopter Turboshaft Engines. https://doi.org/10.4050/sm_prop_2007-1857
- Simpson, R. 1969. “The Outlook for Future Commercial VTOL Transportation.” In VTOL Research, Design, and Operations Meeting. AIAA 1969-198. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-198
- Sims, John. 2022. Validation of Mission Performance Calculator (MPC) for Airworthiness Applications of Future Vertical Lift Platforms. https://doi.org/10.4050/sm_2022_cs-1159
- Sinacori, John B. 1970. Application of the Northrop Rotational Simulator to Helicopters and V/ STOL Aircraft (User’s Guide). Defense Technical Information Center. https://doi.org/10.21236/ad0873037
- Singh, Beerinder, and Inderjit Chopra. 2002. “Whirl Flutter Stability of Two-Bladed Proprotor/Pylon Systems in High Speed Flight.” In 43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2002-1600. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-1600
- Singh, Beerinder, and Inderjit Chopra. 2003a. “A Comprehensive Analysis for Whirl Flutter Stability of Two-Bladed Proprotor/Pylon Systems.” In 44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2003-1788. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-1788
- Singh, Beerinder, and Inderjit Chopra. 2003b. “Whirl Flutter Stability of Two-Bladed Proprotor/Pylon Systems in High Speed Flight.” Journal of the American Helicopter Society 48 (2): 99. https://doi.org/10.4050/jahs.48.99
- Singh, Rupinder, Farhan Gandhi, and Eric Hathaway. 2005. “Active Tiltrotor Whirl-Flutter Stability Augmentation Using Wing-Flaperon and Swashplate Actuation.” In 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. AIAA 2005-2074. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2005-2074
- Sinsay, Jeffrey D., and Juan Jose Alonso. 2015. “Optimization of a Lift-Offset Compound Helicopter in a Multidisciplinary Analysis Environment.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10115
- Sinsay, Jeffrey, and Gerardo Nunez. 2010. “Toward Right-Fidelity Rotorcraft Conceptual Design.” In 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 18th AIAA/ASME/AHS Adaptive Structures Conference 12th. AIAA 2010-2756. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2010-2756
- Sirica, Steven, and Brent Staubach. 2019. Benefits of a Variable Speed Power Turbine as Applied to a High Speed Rotorcraft. https://doi.org/10.4050/sm_2019_prop-962
- Sitaraman, Jayanarayanan, and James Baeder. 2002. “Analysis of Quad-Tiltrotor Blade Aerodynamic Loads Using Coupled CFD/free Wake Analysis.” In 20th AIAA Applied Aerodynamics Conference. AIAA 2002-2813. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-2813
- Siyahi, Mehdi, Hadi Siyahi, Mohsen Fallah, and Zahra Mohammadi. 2024. “Thermodynamic Optimization and Energy-Exergy Analyses of the Turboshaft Helicopter Engine.” International Journal of Thermodynamics 27 (3): 15–25. https://doi.org/10.5541/ijot.1458027
- Slaboch, Paul E., David B. Stephens, and Dale E. Van Zante. 2016. “Effect of Aft Rotor on the Inter-Rotor Flow of an Open Rotor Propulsion System.” In Volume 1: Aircraft Engine; Fans and Blowers; Marine. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2016-56392
- Slaby, Jason, and Edward Smith. 2011. “Aeroelastic Stability of Folding Tiltrotor Aircraft in Cruise Flight with Composite Wings.” In 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. AIAA 2011-2171. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2011-2171
- Smith, E. L. 1963. “Development of the T-74 (PT6) Turboprop/Turboshaft Engine.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/630042
- Smith, C. R. 1968. Hot Cycle Rotor/wing Composite Research Aircraft. Defense Technical Information Center. https://doi.org/10.21236/ad0684315
- Smith, Robert D. 1996b. “Civil Tiltrotor: A New Transportation Alternative.” In SAE Technical Paper Series, vol. 1. SAE International. https://doi.org/10.4271/965522
- Smith, Andrew M. 2011. Network-Based Approach to Optimize Personnel Recovery for the Joint Force. Defense Technical Information Center. https://doi.org/10.21236/ada546124
- Smith, M., K. Ahuja, and A. Fleming. 1994. “Computational and Experimental Simulations of Tiltrotor Configurations in Hover.” In 32nd Aerospace Sciences Meeting and Exhibit. AIAA 1994-735. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1994-735
- Smith, K. E., H. R. Alexander, and M. D. Maisel. 1985. Design Aspects of the XV-15 Advanced Technology Blade Program. Boeing Vertol Co. https://ntrs.nasa.gov/citations/19860050892
- Smith, S., S. Cliff, and I. Kroo. 1987. “The Design of a Joined Wing Flight Demonstrator Aircraft.” In Aircraft Design, Systems and Operations Meeting. AIAA 1987-2930. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-2930
- Smith, Brendan, Ullhas Udaya Hebbar, and Gandhi. 2023. “The Effects of Rotor-Rotor and Rotor-Wing Interactions on eVTOL Aeroacoustics.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-17956
- Smith, R., and A. Levin. 1981. “Propfan Installation Aerodynamics of a Supercritical Swept Wing Transport Configuration.” In 17th Joint Propulsion Conference. AIAA 1981-1563. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-1563
- Smith, Brendan, Anastasios S. Lyrintzis, Farhan S. Gandhi, and Richard Healy. 2021. “eVTOL Rotor Noise in Ground Effect.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16684
- Smith, Charles C., Jr. 1958a. Hovering and Transition Flight Tests of a 1/5-Scale Model of a Jet-Powered Vertical-Attitude VTOL Research Airplane. NASA-MEMO-1-10-27-58L. NASA. https://ntrs.nasa.gov/citations/19980227972
- Smith, C. C., Jr. 1958b. Hovering and Transition Flight Tests of a 1/5-Scale Model of the Ryan X-13 VTOL Airplane. NACA-RM-SL58H29. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19710082837
- Smith, Charles C., Jr. 1959. Flight Tests of a 1/8-Scale Model of the Bell D-188A Jet VTOL Airplane. NASA-MEMO-3-16-59L. NASA. https://ntrs.nasa.gov/citations/19980228302
- Smith, Charles C., Jr. 1961a. Flight Tests of a 1/6-Scale Model of the Hawker P 1127 Jet VTOL Airplane. NASA-TM-SX-531. NASA. https://ntrs.nasa.gov/citations/19980227431
- Smith, Charles C., Jr. 1961b. Hovering and Transition Flight Tests of a 1/5-Scale Model of a Jet-Powered Vertical-Attitude VTOL Research Airplane. NASA-TN-D-404. NASA. https://ntrs.nasa.gov/citations/19980230621
- Snyder, Aaron. 1987. “Numerical Simulation of Transonic Propeller Flow Using a Three-Dimensional Small Disturbance Code Employing Novel Helical Coordinates.” In 8th Computational Fluid Dynamics Conference. AIAA 1987-1162. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-1162
- Snyder, Christopher A. 2013. Defining Gas Turbine Engine Performance Requirements for the Large Civil TiltRotor (LCTR2). NASA/TM-2013-218101. NASA. https://ntrs.nasa.gov/citations/20140005753
- Snyder, Christopher A. 2014. “Exploring Advanced Technology Gas Turbine Engine Design and Performance for the Large Civil Tiltrotor (LCTR).” In 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference. AIAA 2014-3442. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2014-3442
- Snyder, Christopher A., and Cecil W. Acree. 2012. Preliminary Assessment of Variable Speed Power Turbine Technology on Civil Tiltrotor Size and Performance. https://doi.org/10.4050/vfs-f68-000295
- Snyder, Christopher, Mark Robuck, Joseph Wilkerson, Bob Maciolek, and Yiyi Zhang. 2013. “Study and Sub-System Optimization of Propulsion and Drive Systems for the Large Civil TiltRotor (LCTR2) Rotorcraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-0288
- Snyder, Christopher A., Mark Robuck, Joseph Wilkerson, and Carl Nordstrom. 2010. “Summary of the Large Civil Tiltrotor (LCTR2) Engine Gearbox Study.” In American Inst. of Aeronautics and Astronautics. https://ntrs.nasa.gov/citations/20100042405
- Snyder, Christopher A., and Douglas R. Thurman. 2010. Gas Turbine Characteristics for a Large Civil Tilt-Rotor (LCTR). NASA/TM-2010-216089. NASA. https://ntrs.nasa.gov/citations/20100011336
- Snyder, Christopher, and Michael T. Tong. 2019. “Modeling Turboshaft Engines for the Revolutionary Vertical Lift Technology Project.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14686
- Soares, Alvaro, Brian LeFevre, Treven Baker, and Mark Davis. 2015. “Automated Power Assurance Refinement for a Turboshaft Engine.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10244
- Soemarwoto, Bambang, Remco Habing, and Matteo Pecoraro. 2022. “Adaptive Design Method for a Tilt-Rotor Engine Inlet Duct Optimization.” In AIAA AVIATION 2022 Forum. AIAA 2022-4019. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-4019
- Soistmann, David. 1992. “An Experimental and Analytical Investigation of Wing Flutter on a Trail Rotor V/STOL Aircraft.” In Dynamics Specialists Conference. AIAA 1992-2112. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-2112
- Solis, Eduardo, and Larry Meyn. 2016. “Photogrammetric Deflection Measurements for the Tiltrotor Test Rig (TTR) Multi-Component Rotor Balance Calibration.” In AHS Technical Meeting on Aeromechanics Design for Vertical Lift. https://ntrs.nasa.gov/citations/20190025427
- Son, Hyeok-Jin, Jaeheon Jeong, Jae-Sang Park, and Myeong-Kyu Lee. 2025b. “Vibration and Blade-Vortex Interaction Noise Analyses for Butterfly eVTOL Tiltrotor.” Journal of the Korean Society for Aeronautical & Space Sciences 53 (8): 839–48. https://doi.org/10.5139/jksas.2025.53.8.839
- Son, Sang Min, Chan-Ho Song, M. Sadegh Araghizadeh, Rho Shin Myong, and Hakjin Lee. 2025a. “Investigation of Aerodynamics, Wake Dynamics, and Aeroacoustic Characteristics of a Full-Configuration Tiltrotor Aircraft during Transition Flight.” Physics of Fluids 37 (10): 107133. https://doi.org/10.1063/5.0296874
- Sonder, Gerhard. 1965. “Abusive Testing of Turboshaft Engines.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f21-023
- Song, Ohseop. 2007. “Vibration Control of Composite Wing-Rotor System of Tiltrotor Aircraft.” Journal of the Korean Society for Aeronautical & Space Sciences 35 (6): 509–16. https://doi.org/10.5139/jksas.2007.35.6.509
- Song, Ohseop, Hyuck-Dong Kwon, and Liviu Librescu. 2000. “Vibration of Adaptive Wing-Rotor System for Tiltrotor Aircraft Application.” In 41st Structures, Structural Dynamics, and Materials Conference and Exhibit. AIAA 2000-1716. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2000-1716
- Song, Ohseop, Hyuck-Dong Kwon, and Liviu Librescu. 2006. “Modeling, Vibration and Instability of an Advanced Tiltrotor-Wing System.” In 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 14th AIAA/ASME/AHS Adaptive Structures Conference 7th. AIAA 2006-1872. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-1872
- Songchao, Zhang, Xue Xinyu, Sun Zhu, Zhou Lixin, and Jin Yongkui. 2017. “Downwash Distribution of Single-Rotor Unmanned Agricultural Helicopter on Hovering State.” International Journal of Agricultural and Biological Engineering 10 (5): 14–24. https://doi.org/10.25165/j.ijabe.20171005.3079
- Sonoda, Toyotaka. 2005. “HF118 Turbofan Engine for a Small Business Jet.” Journal of the Society of Mechanical Engineers 108 (1039): 456–57. https://doi.org/10.1299/jsmemag.108.1039_456
- Soohoo, P., L. Morino, R. B. Noll, and N. D. Ham. 1977. Aerodynamic Interference Effects on Tilting Proprotor Aircraft. NASA-CR-152053. NASA. https://ntrs.nasa.gov/citations/19780005064
- Soule, V. A. 1973. V/STOL Tilt Rotor Aircraft Study. Volume 5: Definition of Stowed Rotor Research Aircraft. NASA-CR-114598. NASA. https://ntrs.nasa.gov/citations/19730021277
- Soule, V. A., and Y. Badri-Nath. 1973. V/STOL Tilt Rotor Aircraft Study. Volume 6: Preliminary Design of a Composite Wing for Tilt Rotor Research Aircraft. NASA-CR-114599. NASA. https://ntrs.nasa.gov/citations/19730021278
- Soule, Thomas L., and William W. Hixson. 1976. “Selection of a Fuel Handling System for a Small Advanced Turboshaft Engine.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f32-0043
- Soundararajan, R., and T. J. S. Jothi. 2021. “Acoustic Emissions from a High-Speed Propeller.” IOP Conference Series: Materials Science and Engineering 1189 (1): 012034. https://doi.org/10.1088/1757-899x/1189/1/012034
- Spacht, G. 1983. “X-29 Integrated Technology Demonstrator and ATF.” In Aircraft Prototype and Technology Demonstrator Symposium. AIAA 1983-1058. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-1058
- Spack, Jeffrey Michael. n.d. “Linear Parameter Varying Controller for a Small Turboshaft Engine.” PhD diss., Northeastern University. https://doi.org/10.17760/d20001226
- “Speed and Runway Independent Technologies (Sprint).” 2023a. USAspending.gov, November 1. https://www.usaspending.gov/award/CONT_AWD_HR001124C0327_9700_-NONE-_-NONE-
- “Speed and Runway Independent Technologies (Sprint).” 2023b. USAspending.gov, October 31. https://www.usaspending.gov/award/CONT_AWD_HR001124C0326_9700_-NONE-_-NONE-
- “Speed and Runway Independent Technologies (Sprint) Program.” 2023c. USAspending.gov, November 1. https://www.usaspending.gov/award/CONT_AWD_HR001124C0325_9700_-NONE-_-NONE-
- Spencer, Robert H., H. Sternfeld, and Perry R. Ziegenbein. 1996. “Evaluation of the Impact of Noise Metrics on Tiltrotor Aircraft Design.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f52-1012
- Spitzer, R., P. Rumsey, and H. Quigley. 1972. “Use of the Flight Simulator in the Design of a STOL Research Aircraft.” In 4th Aircraft Design, Flight Test, and Operations Meeting. AIAA 1972-762. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1972-762
- Spivey, Dick. 2002. “Runway Independent Aircraft Can Increase the Capacity of Existing Airports.” In 2002 Biennial International Powered Lift Conference and Exhibit. AIAA 2002-5958. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-5958
- Spivey, Natalie Dawn, Samson Truong, and Roger Truax. n.d. “All-Electric X-Plane, X-57 Mod II Ground Vibration Test.” In IMAC 39. https://ntrs.nasa.gov/citations/20205006955
- Splettstoesser, W., K. Schultz, and Ruth Martin. 1987. “Rotor Blade-Vortex Interaction Impulsive Noise Source Identificationand Correlation with Rotor Wake Predictions.” In 11th Aeroacoustics Conference. AIAA 1987-2744. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-2744
- Spooner, S. H. 1968. “The V/STOL Aircraft Environment.” In ASME 1968 Gas Turbine Conference and Products Show. American Society of Mechanical Engineers. https://doi.org/10.1115/68-gt-40
- Spreemann, K. P. 1960. Induced Interference Effects on Jet and Buried-Fan VTOL Configurations in Transition. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19630004813
- Spreemann, K. P. 1966. Wind Tunnel Investigation of Longitudinal Aerodynamic Characteristics of a Powered Four-Duct-Propeller VTOL Model in Transition. NASA-TN-D-3192. NASA. https://ntrs.nasa.gov/citations/19660013630
- Spreemann, K. P. 1968. Wind-Tunnel Investigation of Lateral Aerodynamic Characteristics of a Powered Four-Duct-Propeller VTOL Model in Transition. NASA-TN-D-4343. NASA. https://ntrs.nasa.gov/citations/19680007554
- Spreuer, W. E. 1968a. “Experimental Flight Tests of the 300 Mph XH-51A Compound Helicopter.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f24-026
- Spreuer, W. E. 1968b. “Experimental Flight Tests of the XH-51A Compound Helicopter.” Journal of the American Helicopter Society 13 (3): 64–69. https://doi.org/10.4050/jahs.13.64
- Spytek, Christopher. 2019. “A Small Multi-Inter Turbine Burner-Enabled Turboshaft Engine for UAV Applications.” In AIAA Propulsion and Energy 2019 Forum. AIAA 2019-4233. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-4233
- Sridhar, Pranav, and Marilyn J. Smith. 2026a. “Mid-Fidelity Investigation of the Proprotor-Wing Aerodynamic Interactions across the Tiltrotor Conversion Maneuver.” In Proceedings of the Vertical Flight Society 82nd Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0082-2026-0243
- Sridhar, Pranav, Shreyas Srivathsan, Juergen Rauleder, and Marilyn Smith. 2025. “Physics of the Interactional Proprotor-Wing Aerodynamics during the Tiltrotor Conversion Maneuver.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0271
- Srinivas, Venkat, and Inderjit Chopra. 1996. “Formulation of a Comprehensive Aeroelastic Analysis for Tiltrotor Aircraft.” In 37th Structure, Structural Dynamics and Materials Conference. AIAA 1996-1546. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1996-1546
- Srinivas, Venkataraman, and Inderjit Chopra. 1998b. “Validation of a Comprehensive Aeroelastic Analysis for Tiltrotor Aircraft.” Journal of the American Helicopter Society 43 (4): 333–41. https://doi.org/10.4050/jahs.43.333
- Srinivas, Venkat, Inderjit Chopra, and Mark Nixon. 1995. “Aeroelastic Analysis of Advanced Geometry Tiltrotor Aircraft.” In 36th Structures, Structural Dynamics and Materials Conference. AIAA 1995-1454. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1995-1454
- Srinivas, Venkataraman, Inderjit Chopra, and Mark W. Nixon. 1998. “Aeroelastic Analysis of Advanced Geometry Tiltrotor Aircraft.” Journal of the American Helicopter Society 43 (3): 212–21. https://doi.org/10.4050/jahs.43.212
- Stack, John, Eugene C. Draley, James B. Delano, and Lewis Feldman. 1950. Investigation of the NACA 4-(3)(8)-045 Two-Blade Propellers at Forward Mach Numbers to 0.725 to Determine the Effects of Compressibility and Solidity on Performance. NACA-TR-999. National Advisory Committee for Aeronautics. Langley Aeronautical Lab. https://ntrs.nasa.gov/citations/19930092056
- Stagliano, Florian, and Mirko Hornung. 2012. “Impact of Novel Propulsion System Architectures Incorporating Diesel Engines on Mission Fuel Burn for a Tilt-Wing Transport Aircraft.” In 12th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference and 14th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference. AIAA 2012-5587. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2012-5587
- Stahl, Philipp, Christian Rössler, and Mirko Hornung. 2018. “Benefit Analysis and System Design Considerations for Drag Reduction of Inactive Hover Rotors on Electric Fixed-Wing VTOL Vehicles.” In 2018 Aviation Technology, Integration, and Operations Conference. AIAA 2018-4150. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-4150
- Stalker, Aaron, Dino Cerchie, Lach Cullen, and Israel Wygnanski. 2004. “Usng Periodic Perturbations for Download Alleviation on Tilt-Rotor Airplane Models in Hover.” In 2nd AIAA Flow Control Conference. AIAA 2004-2515. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2004-2515
- Stanisławski, Jarosław. 2020. “Effectiveness of the Compound Helicopter Configuration in Rotorcraft Performance Increase.” Transactions on Aerospace Research 2020 (4): 81–106. https://doi.org/10.2478/tar-2020-0023
- Stanzione, Kaydon A. 2025. “History of Cost and Operational Effectiveness Analyses of the V-22 Osprey.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0090
- Stapleford, Robert L. 1980. “Velocity Command/Position Hold: A New Flight Control Concept for Hovering VTOL Aircraft.” In SAE Technical Paper Series, vol. 1. SAE International. https://doi.org/10.4271/801206
- Stargel, Doane, and Drew Landman. 2012. “A Wind Tunnel Investigation of Ship Airwake/rotor Downwash Coupling Using Design of Experiments Methodologies.” In 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. AIAA 2012-767. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2012-767
- Starkey, H. B., and H. C. True. 1963. “Design and Development of the Army XV-5A Lift Fan Powered V/STOL Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f19-011
- Staruk, William J., Inderjit Chopra, and Anubhav Datta. 2017. “Loads Prediction for a Gimbaled Tiltrotor in Conversion Flight Using CAD-Based 3-D Structural Analysis Models.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12065
- Staruk, William, and Anubhav Datta. 2017. “Fundamental Understanding, Prediction, and Validation of Tiltrotor Dynamic Loads in Transition Flight Using RANS/FEA.” In 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2017-0859. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-0859
- Staruk, William J., Elizabeth Weiner, and Inderjit Chopra. 2015. “CAD-Based 3-D Structural Dynamic Modeling of the Tilt Rotor Aeroacoustic Model (TRAM) Proprotor.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0071-2015-10164
- Statler, W. 1966. “Applications of VTOL and STOL Aircraft: Boston to Washington.” In 3rd Annual Meeting. AIAA 1966-964. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1966-964
- Stefko, G., and R. Jeracki. 1985a. “Wind Tunnel Results of Advanced High Speed Propellers in the Takeoff, Climb, and Landing Operating Regimes.” In 21st Joint Propulsion Conference. AIAA 1985-1259. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1985-1259
- Stefko, George L., and Robert J. Jeracki. 1985b. Wind-Tunnel Results of Advanced High-Speed Propellers at Takeoff, Climb, and Landing Mach Numbers. NASA-TM-87030. NASA. https://ntrs.nasa.gov/citations/19890009894
- Steils, W., Jr. 1965. “V/STOL Hover Control System Analysis.” In Aircraft Design and Technology Meeting. AIAA 1965-799. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1965-799
- Steinhoff, John, Marvin A. Moulton, Robert B. Haehnel, and Yonghu Wenren. 2008. A Model to Simulate Rotorcraft-Induced Brownout. https://doi.org/10.4050/vfs-f64-000093
- Stepniewski, W. Z. 1957. “Tilt Wing Aircraft in Comparison with Other VTOL and STOL Systems.” Journal of the Helicopter Association of Great Britain 11 (6): 299–331. https://doi.org/10.1017/s2753447200003528
- Stepniewski, W. Z. 1974. “Civilian Vertical Lift Systems and Aircraft in North America.” Aeronautical Journal 78 (762): 231–49. https://doi.org/10.1017/s0001924000036861
- Sternfeld, H., R. Spencer, and P. Ziegenbein. 1995. Evaluation of the Impact of Noise Metrics on Tiltrotor Aircraft Design. NASA-CR-198240. NASA. https://ntrs.nasa.gov/citations/19960009107
- Stettner, Martin, and Daniel Schrage. 1992. “An Approach to Tiltrotor Wing Aeroservoelastic Optimization through Increased Productivity.” In 4th Symposium on Multidisciplinary Analysis and Optimization. AIAA 1992-4781. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-4781
- Stevens, Mark, David Lewicki, and Robert Handschuh. 2015. “Concepts for Multi-Speed Rotorcraft Drive System: Status of Design and Testing at NASA GRC.” In Proceedings of the Vertical Flight Society 71st Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0071-2015-10243
- Stevens, Mark, Mark J. Valco, and Kelsen E. LaBerge. 2018. “Two-Speed Rotorcraft Research Transmission Power-Loss Associated with the Lubrication and Hydraulic Rotating Feed-Through Design Feature.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12853
- Stewart, V. 1979. “The Characteristics of a Lift Cruise Fan V/STOL Configuration in near Proximity to a Small Deck with Finite Edge Positions.” In Aircraft Systems and Technology Meeting. AIAA 1979-1854. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1979-1854
- Stockman, N. O. 1974. “Potential and Viscous Flow Prediction in V/STOL Propulsion System Inlets.” In Workshop on Prediction Methods for Jet V/STOL propulsion Aerodynamics. https://ntrs.nasa.gov/citations/19750021037
- Stockman, N. 1975a. “Potential and Viscous Flow in VTOL, STOL or CTOL Propulsion System Inlets.” In 11th Propulsion Conference. AIAA 1975-1186. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1975-1186
- Stockman, N. O. 1975b. “Potential and Viscous Flow Prediction in V/STOL Propulsion System Inlets.” In U.S. Naval Air Systems Command, Workshop on Prediction Methods for Jet V/STOL Propulsion Aerodynamics. https://ntrs.nasa.gov/citations/19750058000
- Stockman, N. O. 1979. “Recent Applications of Theoretical Analysis to V/STOL Inlet Design.” In Workshop on V/STOL Aerodyn.. https://ntrs.nasa.gov/citations/19790020972
- Stolp, P. 1979. Allison PD370-42 Advanced Turboprop Engine. Defense Technical Information Center. https://doi.org/10.21236/ada094443
- “Stop Fold Tilt Rotor Study.” 2008. USAspending.gov, May 30. https://www.usaspending.gov/award/CONT_AWD_HR001108C0077_9700_-NONE-_-NONE-
- Strand, T., and E. S. Levinsky. 1969. Wind Tunnel Tests of a Free-Wing Tilt-Propeller V/STOL Airplane Model. Defense Technical Information Center. https://doi.org/10.21236/ad0698355
- Stratton, Zachary, John T. Spyropoulos, Sanjeeb Bose, and Jelena Svorcan. 2023. “Rotor Performance and Turbulent Wake Simulations of a Scaled Helicopter Rotor in Hover Using Wall-Modeled Large-Eddy Simulations.” In AIAA SCITECH 2023 Forum. AIAA 2023-2636. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-2636
- Strawn, Roger, Michael Garceau, and Rupak Biswas. 1993. “Unstructured Adaptive Mesh Computations of Rotorcraft High-Speed Impulsive Noise.” In 15th Aeroacoustics Conference. AIAA 1993-4359. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-4359
- Streich, Eric. 2013. “50 Years of Rotorcraft Acquisition and the Implications for Future Vertical Lift.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-0136
- Stroub, Robert H. 1991. Introduction of the M-85 High-Speed Rotorcraft Concept. NASA-TM-102871. NASA. https://ntrs.nasa.gov/citations/19910009765
- Stroub, Robert H. 1992. “Introduction of the M-85 High Speed Rotorcraft Concept.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f48-2018
- Studebaker, Karen, and Anita Abrego. 1994. “Ground Vibration Test of the XV-15 Tiltrotor Research Aircraft and Pretest Predictions.” In 1993 Technical Paper Contest for Women. Gear Up 2000: Women in Motion. https://ntrs.nasa.gov/citations/19940031465
- Study on the Feasibility of V/STOL Concepts for Short Haul Transport Aircraft. 1967. NASA-CR-73111. NASA. https://ntrs.nasa.gov/citations/19670023149
- Stutz, Colin Matthew, Mary L. Houston, and Nikolas S. Zawodny. 2026a. “An Overview of the Vertical Lift Proprotor Noise Test in NASA’s 14- by 22- Foot Subsonic Tunnel (Presentation Only).” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0339
- Stutz, Colin M., Nikolas S. Zawodny, and Mary L. Houston. 2026b. Summary of the Vertical Lift Proprotor Noise Test. NASA/TM-20260007850. NASA. https://ntrs.nasa.gov/citations/20260007850
- Su, Zhimin, Wei Li, Benlin Cheng, Xing Huang, Junyu He, and Yuchun Chen. 2025. “Overall Performance Analysis of the Counter-Rotating Propfan Engine.” In Springer Aerospace Technology. Springer Nature Singapore. https://doi.org/10.1007/978-981-96-3240-4_18
- Su, Weihua, Shen Qu, Guoming G. Zhu, Sean Shan-Min Swei, Mariko Hashimoto, and Tao Zeng. 2021. “A Control-Oriented Dynamic Model of Tiltrotor Aircraft for Urban Air Mobility.” In AIAA Scitech 2021 Forum. AIAA 2021-0091. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-0091
- Suchezky, Mark, and G. Scott Cruzen. 2012. Variable-Speed Power-Turbine for the Large Civil Tilt Rotor. NASA/CR-2012-217424. NASA. https://ntrs.nasa.gov/citations/20120003373
- Suder, Kenneth L. 2019. Future Vertical Lift Propulsion Systems & Associated S&T Challenges. https://doi.org/10.4050/sm_2019_prop-969
- Suenai Haramura Bastos, Sérvio Túlio, and Rui Marcos Grombone de Vasconcellos. 2022. “Análise Do Comportamento Aeroelástico Da Instabilidade De Whirl-Flutter Em Rotores De Aeronaves.” In XXVIII Congresso Nacional de Estudantes de Engenharia Mecânica. ABCM. https://doi.org/10.26678/abcm.creem2022.cre2022-0022
- Sugawara, Hideaki, Yasutada Tanabe, and Masaharu Kameda. 2020. “Download Due to Aerodynamic Interaction between Rotor and Wing at Hover.” Journal of the Japan Society for Aeronautical and Space Sciences 68 (4): 163–71. https://doi.org/10.2322/jjsass.68.163
- Sulkoske, R. A., R. N. Tucker, and J. E. Holmes. 1977. V/STOL Shaft Propulsion System Analytical Performance Model. AIAA PAPER 77-582. General Motors Corp. https://ntrs.nasa.gov/citations/19770052088
- Sullivan, T. 1993. “The Canadair CL-84 Tilt Wing Design.” In Aircraft Design, Systems, and Operations Meeting. AIAA 1993-3939. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-3939
- Sullivan, John. 1999. Small Turboshaft Engine Operating Pressure Ratio Optimization for Cost. https://doi.org/10.4050/sm_1999_prop-4291
- Sun, Xiangcheng, Yichen Wang, and Xian Wang. 2026. “Investigation on the Vortical Interference between Typical Rotor Configurations and a Tilting Wing in an Electric Vertical Take-off and Landing Aircraft.” Physics of Fluids 38 (4): 045106. https://doi.org/10.1063/5.0308470
- Sunkara, Vishwamithra, Wilfred Nobleheart, and Animesh Chakravarthy. 2013. “Time-Varying Dynamics of a Tiltrotor during Its Transition Phase.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-0236
- Suresh, Ambady. 2020. “A Simple Model of Rotor Upwash in Ground Effect.” In AIAA Scitech 2020 Forum. AIAA 2020-1999. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-1999
- Sushereba, Christen E., Julie B. Diiulio, Laura G. Militello, and Emilie Roth. 2019. “A Tradespace Framework for Evaluating Crewing Configurations for Future Vertical Lift.” Proceedings of the Human Factors and Ergonomics Society Annual Meeting 63 (1): 352–56. https://doi.org/10.1177/1071181319631251
- Sutherland, James, and Anubhav Datta. 2021. “Fabrication, Testing, and 3-D Comprehensive Analysis of Swept Tip Tiltrotor Blades.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16760
- Sutherland, James R., Frederick Tsai, and Anubhav Datta. 2022. “Whirl Flutter Test of the Maryland Tiltrotor Rig: Swept-Tip Blades.” In AIAA SCITECH 2022 Forum. AIAA 2022-0568. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-0568
- Sutherland, James, Frederick Tsai, and Anubhav Datta. 2024. “Whirl Flutter Test of Swept-Tip Tiltrotor Blades.” Journal of the American Helicopter Society 69 (1): 1–12. https://doi.org/10.4050/jahs.69.012010
- Sutton, L. R., and R. L. Bennett. 1984. “Aeroelastic-Aerodynamic Optimization of High Speed Helicopter-Compound Rotor.” In NASA. Langley Research Center Recent Experiences in Multidisciplinary Analysis and Optimization, Part 2. https://ntrs.nasa.gov/citations/19870002325
- Swaim, R. L. 1971. “Control of V/STOL Aircraft in Turbulence.” In ROYAL AERONAUTICAL SOCIETY. https://ntrs.nasa.gov/citations/19710049079
- Swanson, Stephen, and Robert Stroub. 1992. “Low-Speed Cruise Aerodynamics of the Stopped Rotor/disk Rotorcraft Concept.” In Aerospace Design Conference. AIAA 1992-1067. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-1067
- Swift, G., and H. Bartel. 1989. “Fluctuating Pressures on Wing Surfaces in the Slipstream of a Single-Rotor Propfan.” In 12th Aeroacoustic Conference. AIAA 1989-1058. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-1058
- Syal, Monica, and J. Gordon Leishman. 2013b. “Predictions of Brownout Dust Clouds Compared to Photogrammetry Measurements.” Journal of the American Helicopter Society 58 (2): 1–18. https://doi.org/10.4050/jahs.58.022001
- Sydney, Anish, and J. Gordon Leishman. 2013. “Measurements of Rotor/Body Interactions in Ground Effect under Simulated Brownout Conditions.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/vfs-f69-0255
- Syrovy, George, and Siamak Yassini. 2005. Canard Wing Concept for Compound Helicopter. https://doi.org/10.4050/vfs-f61-000149
- Syzdykov, E. K., A. V. Gainutdinova, and K. G. Krikun. 2012. “Development of Control System Algorithms for Mini Unmanned Aerial Vehicle of Combined Scheme — Convertiplane.” Russian Aeronautics (Iz VUZ) 55 (2): 199–202. https://doi.org/10.3103/s1068799812020146
- Szalai, K. 1984. “Role of Research Aircraft in Technology Development.” In Aircraft Design Systems and Operations Meeting. AIAA 1984-2473. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-2473
- Szlenkier, T. K. 1970. Environmental Factors in the Design of Direct Lift V/STOL Transport Aircraft. https://doi.org/10.4050/sm_env_1970-2615
- Szulc, O., P. Doerffer, and F. Tejero. 2016. “Passive Control of Rotorcraft High-Speed Impulsive Noise.” Journal of Physics: Conference Series 760: 012031. https://doi.org/10.1088/1742-6596/760/1/012031
- Tadghighi, Hormoz, and R. Ganesh Rajagopalan. 1999. A User’s Manual for ROTTILT Solver: Tiltrotor Fountain Flow Field Prediction. NASA/CR-1999-208973. NASA. https://ntrs.nasa.gov/citations/19990026295
- Tai, Tze. 1995. “Simulation and Analysis of V-22 Tiltrotor Aircraft Forward Flight Flowfield.” In 33rd Aerospace Sciences Meeting and Exhibit. AIAA 1995-45. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1995-45
- Tai, Tsze. 1996a. “Simulation and Analysis of V-22 Aircraft Maneuvering Aerodynamics.” In 14th Applied Aerodynamics Conference. AIAA 1996-2477. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1996-2477
- Tai, Jimmy, Dimitri Mavris, and Daniel Schrage. 1995. “Application of a Response Surface Method to the Design of Tip Jet Driven Stopped Rotor/wing Concepts.” In Aircraft Engineering, Technology, and Operations Congress. AIAA 1995-3965. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1995-3965
- Tai, Jimmy C. M., Dimitri N. Mavris, and Daniel P. Schrage. 1996. “An Assessment of a Reaction Driven Stopped Rotor/Wing Using Circulation Control in Forward Flight.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/965612
- Tai, Jimmy, Dimitri Mavris, Daniel Schrage, Jimmy Tai, Dimitri Mavris, and Daniel Schrage. 1997. “A Comparative Assessment of High-Speed Rotorcraft Concepts (HSRC): Reaction Driven Stopped Rotor/wing and Variable Diameter Tiltrotor.” In 1997 World Aviation Congress. AIAA 1997-5548. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1997-5548
- Takallu, M., and V. Lessard. 1991. “Periodic Blade Loads of a High Speed Propeller at Small Angle of Attack.” In 27th Joint Propulsion Conference. AIAA 1991-2250. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-2250
- Talbot, Peter D. 1991. “High Speed Rotorcraft: Comparison of Leading Concepts and Technology Needs.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f47-2035
- Talbot, Peter, James Phillips, and Joseph Totah. 1990. “Selected Design Issues of Some High Speed Rotorcraft Concepts.” In Aircraft Design, Systems and Operations Conference. AIAA 1990-3297. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3297
- Tamm, Patrick Q., and John T. Spyropoulos. 2018. “Unstructured Large Eddy Simulation of a Turboshaft Ejector on Rotorcraft.” In 2018 Applied Aerodynamics Conference. AIAA 2018-3064. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-3064
- Tanner, Philip E., Austin D. Overmeyer, Luther N. Jenkins, Chung-Sheng Yao, and Scott M. Bartram. 2015. “Experimental Investigation of Rotorcraft Outwash in Ground Effect.” In AHS International Annual Forum & Technology Display. https://ntrs.nasa.gov/citations/20160006428
- Tapscott, R. J. 1960. Criteria for Primary Handling Qualities Characteristic of VTOL Aircraft in Hovering and Low-Speed Flight. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19630004822
- Taubert, Lutz, Garrett A. Kay, and Israel J. Wygnanski. 2021. “On the Hybrid Tilt-Wing, Tilt Propeller, Active Flow Control Enabled Runway Independent Airplane.” In AIAA Aviation 2021 Forum. AIAA 2021-2815. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2021-2815
- Taubert, Lutz, Garrett Kay, Israel Wygnanski, and Michael Ol. 2023. “Proposed Active Flow Control Enabled Hybrid Tilt Propeller/tilt Wing Aircraft.” International Journal of Numerical Methods for Heat & Fluid Flow 33 (4): 1513–27. https://doi.org/10.1108/hff-11-2022-0653
- Tavares Pereira dos Santos, João Pedro, Gabriel Placeres Araujo, and Flavio D. Marques. 2025. “Passive Mitigation of Whirl Flutter via Nonlinear Vibration Absorber.” In Proceedings of the XX International Symposium on Dynamic Problems of Mechanics. ABCM. https://doi.org/10.26678/abcm.diname2025.din2025-0071
- Taylor, Rodney S., and Joseph B. Wilkerson. 1988. “Civil Tiltrotor Aircraft: A Comparison of Five Candidate Designs.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f44-031
- Technology, Advanced Rotorcraft, Zoren Habana, Advanced Rotorcraft Technology, et al. 2025. “Aerodynamics of Airfoils in Reverse Flow and Impact on Flight Dynamics Simulation of VTOL Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0093
- Teerawathananon, Peekarn, Ioannis Goulos, and David MacManus. 2026. “Machine Learning Approaches for Preliminary Design of Rotorcraft Aeroacoustics.” In 32nd AIAA/CEAS Aeroacoustics Conference (2026). AIAA 2026-3451. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-3451
- Telford, A., and A. Vasiloff. 1968. “Rapid Preparation of VTOL Aircraft Landing Sites.” In 2nd Simulation and Support Conference. AIAA 1968-270. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1968-270
- Teodorescu, Radu, and Inderjit Chopra. 2025. “Proximity Effects of a Pusher Propeller on Compound Helicopter Performance.” In AIAA SCITECH 2025 Forum. AIAA 2025-0626. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-0626
- Teodorescu, Radu, Chloe Johnson, and Inderjit Chopra. 2026. “PIV-Informed Modeling of a Compound Helicopter Pusher Propeller.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0248
- Theodore, Colin R., Carl R. Russell, Gina C. Willink, et al. 2016. Second-Generation Large Civil Tiltrotor 7- by 10-Foot Wind Tunnel Test Data Report. NASA/TM-2016-219394. NASA. https://ntrs.nasa.gov/citations/20180002114
- Theriault, P. W. 1969. “Compound Helicopter as a Short-Haul Transport.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/690419
- Thirumaleshwar Hegde, Navya, V. I. George, and C. Gurudas Nayak. 2021. “Tri-Tilting Rotor Fixed-Wing VTOL UAV: Dynamic Modelling and Transition Flight Control.” In 2021 International Symposium on Electrical, Electronics and Information Engineering. ACM. https://doi.org/10.1145/3459104.3459118
- Thirumaleshwar Hegde, Navya, V. I. George, C. Gurudas Nayak, and Kamlesh Kumar. 2020. “Transition Flight Modeling and Robust Control of a VTOL Unmanned Quad Tilt-Rotor Aerial Vehicle.” Indonesian Journal of Electrical Engineering and Computer Science 18 (3): 1252. https://doi.org/10.11591/ijeecs.v18.i3.pp1252-1261
- Thomas, Russell H., Casey L. Burley, Leonard V. Lopes, Christopher J. Bahr, Frank H. Gern, and Dale E. Van Zante. 2014. “System Noise Assessment and the Potential for Low Noise Hybrid Wing Body Aircraft with Open Rotor Propulsion.” In 52nd Aerospace Sciences Meeting. AIAA 2014-0258. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2014-0258
- Thomason, Tommy H. 1978. “The Promise of Tilt Rotor.” Aircraft Engineering and Aerospace Technology 50 (7): 11–13. https://doi.org/10.1108/eb035465
- Thomason, Tommy H. 1982. “The VTOL TiltRotor Aircraft: Offshore Oil Support Capability.” In Offshore Technology Conference. https://doi.org/10.4043/4380-ms
- Thomason, T. 1983a. “Bell-Boeing JVX Tilt Rotor Program: Flight Test Program.” In 2nd Flight Testing Conference. AIAA 1983-2726. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-2726
- Thomason, Tommy. 1983b. “Military Potential of TiltRotor Aircraft.” Aeronautical Journal 87 (863): 99–103. https://doi.org/10.1017/s0001924000017498
- Thomason, T. 1990. “The Bell Helicopter XV-3 and XV-15 Experimental Aircraft: Lessons Learned.” In Aircraft Design, Systems and Operations Conference. AIAA 1990-3265. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1990-3265
- Thompson, George. 1999. “Combat Search and Rescue (CSAR) Aircraft Effectiveness.” Military Operations Research 4 (4): 65–79. https://doi.org/10.5711/morj.4.4.65
- Thornburgh, Robert P., and Andrew R. Kreshock. 2024. “Structural Modeling and Validation of the TiltRotor Aeroelastic Stability Testbed.” In AIAA SCITECH 2024 Forum. AIAA 2024-1848. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1848
- Thornburgh, Robert, Andrew Kreshock, Hao Kang, Martin Sekula, Thomas Ivanco, and Garrett McHugh. 2025. “An Experimental Parametric Study on the Whirl-Flutter Stability of Tiltrotors.” In Proceedings of the Vertical Flight Society 81st Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0081-2025-0205
- Thorsen, Adam, and Joseph F. Horn. 2015. “Aerobatic Maneuvers of a Conventional and Compound Rotorcraft: Flight Path Generation and Dynamic Simulation.” In AIAA Atmospheric Flight Mechanics Conference. AIAA 2015-2550. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-2550
- Thorsen, Adam T., and Joseph F. Horn. 2016a. “Aerobatic Maneuvers of a Compound Rotorcraft at High Advance Ratios: Flight Path Generation and Dynamic Simulation.” In AIAA Atmospheric Flight Mechanics Conference. AIAA 2016-3391. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-3391
- Thorsen, Adam T., and Joseph F. Horn. 2016b. “Development and Evaluation of a Unified Control Architecture for a Compound Rotorcraft in Maneuvering Flight.” In AIAA Atmospheric Flight Mechanics Conference. AIAA 2016-3392. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2016-3392
- Thurman, Christopher S., and Li Wang. 2025a. “Multifidelity Multipoint Proprotor Blade Optimization for Urban Air Mobility.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0069
- Thurman, Christopher S., and Li Wang. 2025b. “Multifidelity Multipoint Proprotor Optimization for Urban Air Mobility.” In VFS 81st Annual Forum & Technology Display. https://ntrs.nasa.gov/citations/20250003214
- Tiller, F. E., and Robert Nicholson. 1971. “Stability and Control Considerations for a Tilt-Fold-Proprotor Aircraft.” Journal of the American Helicopter Society 16 (3): 23–33. https://doi.org/10.4050/jahs.16.23
- Tilt Rotor Research Aircraft Goes to Ames. 1978. NASA-NEWS-RELEASE-78-45. NASA. https://ntrs.nasa.gov/citations/19780073719
- Tiltrotor Aircraft: Modelling and Flying Qualities. 2018. Wiley. https://doi.org/10.1002/9781119401087.ch10
- Tinney, Charles E., and John A. Valdez. 2024. “Hover Performance and Acoustics of a 35% Scale Notional eVTOL Rotor.” In 30th AIAA/CEAS Aeroacoustics Conference (2024). AIAA 2024-3219. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-3219
- Tischler, Mark B. 1987. Frequency-Response Identification of XV-15 Tilt-Rotor Aircraft Dynamics. NASA-TM-89428. NASA. https://ntrs.nasa.gov/citations/19870013257
- Tischler, Mark B., and Juergen Kaletka. 1986. Modeling XV-15 Tilt-Rotor Aircraft Dynamics by Frequency and Time-Domain Identification Techniques. NASA-TM-89404. NASA. https://ntrs.nasa.gov/citations/19870018198
- Tischler, Mark B., and Juergen Kaletka. 1987. “Modeling XV-15 Tilt-Rotor Aircraft Dynamics by Frequency and Time-Domain Identification Techniques.” In AGARD, Rotorcraft Design for Operations. https://ntrs.nasa.gov/citations/19880002275
- Tischler, M., J. Leung, and D. Dugan. 1983. “Frequency-Domain Identification of XV-15 Tilt-Rotor Aircraft Dynamics.” In 2nd Flight Testing Conference. AIAA 1983-2695. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-2695
- Tischler, M. B., J. G. M. Leung, and D. C. Dugan. 1984. Identification and Verification of Frequency-Domain Models for XV-15 Tilt-Rotor Aircraft Dynamics. NASA-TM-86009. NASA. https://ntrs.nasa.gov/citations/19840026374
- Tischler, Mark B., Joseph G. M. Leung, and Daniel C. Dugan. 1985a. Frequency-Domain Identification of XV-15 Tilt-Rotor Aircraft Dynamics in Hovering Flight. Army Research and Technology Labs. https://ntrs.nasa.gov/citations/19990019287
- Tischler, M. B., J. G. M. Leung, and D. C. Dugan. 1985b. Identification and Verification of Frequency-Domain Models for XV-15 Tilt-Rotor Aircraft Dynamics. NASA Ames Research Center; U.S. Army, Aeromechanics Laboratory, Moffett Field. https://ntrs.nasa.gov/citations/19860042923
- Toney, E. W. 1974. Thrust Vector Control for V/STOL Aircraft. ARC-10788. McDonnell-Douglas Corp. https://ntrs.nasa.gov/citations/19740000049
- Totah, Joseph J. 1992. A Mathematical Model of a Tilt-Wing Aircraft for Piloted Simulation. NASA-TM-103864. NASA. https://ntrs.nasa.gov/citations/19920010605
- Totah, Joseph J., and John F. Madden III. 1990. “Rotor and Control System Loads Analysis of the XV-15 with the Advanced Technology Blades.” In AHS National Technical Specialists’’ Meeting. https://ntrs.nasa.gov/citations/19910046668
- Totah, Joseph J., and John F. Madden III. 1991. “Rotor and Control System Loads Analysis of the XV-15 with the Advanced Technology Blades.” In American Helicopter Society National Technical Specialists’’ Meeting on Innovations in Rotorcraft Test Technologies for the 90’’s. https://ntrs.nasa.gov/citations/19910018820
- Toupet, Olivier, and Bernard Mettler. 2006. “Design and Flight Test Evaluation of Guidance System for Autonomous Rotorcraft.” In AIAA Guidance, Navigation, and Control Conference and Exhibit. AIAA 2006-6201. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-6201
- Tran, Steven A., and Joon W. Lim. 2022. “Interactional Aerodynamics of the XV-15 Tiltrotor Aircraft during Conversion Maneuvers.” Journal of the American Helicopter Society 67 (3): 56–68. https://doi.org/10.4050/jahs.67.032005
- Tran, Steven, US Army CCDC AvMC, and Joon Lim. 2020. “Investigation of the Interactional Aerodynamics of the XV-15 Tiltrotor Aircraft.” In Proceedings of the Vertical Flight Society 76th Annual Forum. The Vertical Flight Society. https://doi.org/10.4050/f-0076-2020-16464
- Tran, Steven, and Hyeonsoo Yeo. 2022a. “Transient and Quasi-Steady Numerical Simulations of Tiltrotor Conversion Maneuvers.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0078-2022-1173
- Tran, Steven A., and Hyeonsoo Yeo. 2022b. “Transient and Quasi-Steady Numerical Simulations of Tiltrotor Conversion Maneuvers.” Journal of the American Helicopter Society 68 (2): 18–32. https://doi.org/10.4050/jahs.68.022003
- Tran, Steven A., Hyeonsoo Yeo, Joon W. Lim, and Andrew Wissink. 2023. “Towards CFD Simulations of Transient Tiltrotor Conversion Maneuvers.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-17989
- “Transition Aerodynamics for Close-Coupled Wing-Canard configurationV/STOL Operations.” 1979. In 17th Aerospace Sciences Meeting. AIAA 1979-336. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1979-336
- “Transition Dynamics of VTOL Aircraft.” 2010. In Multiple Scales Theory and Aerospace Applications. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/5.9781600867644.0293.0305
- Tritschler, John K., and Roberto Celi. 2012. Modeling Issues in the Prediction of the Modulation Transfer Function of a Brownout Cloud. https://doi.org/10.4050/vfs-f68-000253
- Tritschler, John, Roberto Celi, and J. Gordon Leishman. 2012. “A Methodology for Rotorcraft Brownout Mitigation through Flight Path Optimization.” In Proceedings of the AHS International 68th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/vfs-f68-000134
- Tritschler, John K., Monica Syal, Roberto Celi, and J. Gordon Leishman. 2010. “A Methodology for Rotorcraft Brownout Mitigation Using Rotor Design Optimization.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f66-000427
- Tronconi, Alessandro, David He, and Eric R. Bechhoefer. 2025. “Evaluating Large Language Models for Turboshaft Engine Torque Prediction.” In Annual Conference of the PHM Society, vol. 17. https://doi.org/10.36001/phmconf.2025.v17i1.4407
- True, Harris C. 1967. Advanced Lift Fan System (Lfx) Study Continuation. Defense Technical Information Center. https://doi.org/10.21236/ad0824698
- Tsai, Frederick, and Anubhav Datta. 2019. “Design of a New Tilt Rotor Test Facility at the University of Maryland.” In AIAA Scitech 2019 Forum. AIAA 2019-2136. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-2136
- Tsai, Frederick, James R. Sutherland, Akinola Akinwale, Amy Morin, Seyhan Gul, and Anubhav Datta. 2022. “Whirl Flutter Test of the Maryland Tiltrotor Rig: Overview.” In AIAA SCITECH 2022 Forum. AIAA 2022-0567. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-0567
- Tsai, Frederick, Sutherland, Akinwale, Morin, Gul, and Datta. 2024. “Development and Whirl Flutter Test of the Maryland Tiltrotor Rig.” Journal of the American Helicopter Society 69 (1): 1–15. https://doi.org/10.4050/jahs.69.012009
- Tuck, Dennis. 1970. “IFR Airworthiness Standards for VTOL Aircraft.” In Proceedings of the Specialists Meeting on Environmental Effects on VTOL Designs - Arlington, Texas 1970. The Vertical Flight Society. https://doi.org/10.4050/sm_env_1970-3097
- Tulino, J. N., P. C. Bosse, and W. H. Wiley. 1971. “Preliminary Design and Analysis of an Advanced Convertible Fan/Shaft Engine for V/STOL Tactical and Transport Aircraft.” Journal of the American Helicopter Society 16 (2): 34–42. https://doi.org/10.4050/jahs.16.2.34
- Tung, C., and S. Low. 1997. Flow Field around a Hovering Rotor. NASA-TM-110426. NASA. https://ntrs.nasa.gov/citations/19970011616
- Tung, C., and Kenneth W. McAlister. 2008. Experimental Study of a Hovering Coaxial Rotor with Highly Twisted Blades. https://doi.org/10.4050/vfs-f64-000224
- Turboprop/Turboshaft Engine. 2018. American Institute of Aeronautics and Astronautics, Inc. https://doi.org/10.2514/5.9781624105173.0705.0732
- Turner, Gary D. 1969. “V/STOL Overwater Operation.” In AIAA Aircraft Design and Operations Meeting. AIAA 1969-791. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1969-791
- Turner, Howard L., and Fred J. Drinkwater III. 1963. Some Flight Characteristics of a Deflected Slipstream V/STOL Aircraft. NASA-TN-D-1891. NASA. https://ntrs.nasa.gov/citations/19630008786
- Tyler, David, Michelle Ku, and Lakshmi N. Sankar. 2026. “An Inverse Design Methodology for Improved Hover Performance of the UH60A Rotor.” In AIAA AVIATION 2026 Forum. AIAA 2026-4403. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-4403
- Tzeng, Chyau-Song, and Troy Cyril Schank. 2019. Folding Proprotor Gimbal Lock and Blade Lock Mechanism. https://patents.google.com/patent/US10336447B2/en
- U.S. Department of Defense. 2004. Department of Defense Handbook: Flying Qualities of Piloted Aircraft. MIL-HDBK-1797 Notice 1. U.S. Department of Defense. https://everyspec.com/MIL-HDBK/MIL-HDBK-1500-1799/MIL-HDBK-1797_NOTICE-1_39380/
- U.S. Department of Defense. 2014. Department of Defense Handbook: Airworthiness Certification Criteria. MIL-HDBK-516C. U.S. Department of Defense. https://everyspec.com/MIL-HDBK/MIL-HDBK-0500-0599/MIL-HDBK-516C_52120/
- U.S. Standard Atmosphere, 1976. 1976. NASA-TM-X-74335. NASA. https://ntrs.nasa.gov/citations/19770009539
- Udroiu, Razvan, and Madalina-Ioana Blaj. 2016. “Conceptual Design of a VTOL Remotely Piloted Aircraft for Emergency Missions.” Scientific Research and Education in the AIR Force 18 (1): 207–14. https://doi.org/10.19062/2247-3173.2016.18.1.27
- Uehara, Daiju, Larry H. Matthies, and Jayant Sirohi. 2019. “Flight Power Modeling of VTOL Aircraft for Exploration of Titan.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14495
- Ugwueze, Osita, Thomas Statheros, Nadjim Horri, Mauro Innocente, and Michael Bromfield. 2022. “Investigation of a Mission-Based Sizing Method for Electric VTOL Aircraft Preliminary Design.” In AIAA SCITECH 2022 Forum. AIAA 2022-1931. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-1931
- Umapathy, Nirmal, Nandini Gopalakrishnan, and Tony Wiederkehr. 2021. “Design and Simulation of a Novel E-VTOL Aircraft AM20 to Understand Challenges in Certification and Flight Testing.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16787
- Unger, George, and Harold Alexander. 1991. Research Needs for a Commercial Passenger Tiltrotor. NASA Headquarters. https://ntrs.nasa.gov/citations/19920073674
- Uppaluri, B., and B. Douglass. 1991. “A Validated Finite Element Frequency Response Criterion for Resonant-Free Gear Design of the V-22 Tiltrotor Aircraft.” In 27th Joint Propulsion Conference. AIAA 1991-1908. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-1908
- Uppoor, Vivek, and Inderjit Chopra. 2026. “Experimental Study of a High Advance Ratio Lift-Compounded Slowed Rotor in Rearward Shaft Tilt.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0251
- Uppoor, Vivek, Inderjit Chopra, and Chloe Johnson. 2026. “Wind Tunnel Flowfield and Performance Measurements of a Dynamically-Scaled Lift- and Thrust-Compounded Rotorcraft in High-Speed Flight.” In Proceedings of the Vertical Flight Society 82nd Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0082-2026-0148
- Uppoor, Vivek, Inderjit Chopra, and Mrinalgouda Patil. 2024a. “Aeromechanics Investigation of a Dual-Wing Lift Compounded Slowed Mach Scale Rotor.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1234
- Uppoor, Vivek, Mrinalgouda Patil, and Inderjit Chopra. 2024b. Wind Tunnel Testing of a Slowed Mach-Scaled Hingeless Rotor with Lift and Thrust Compounding. https://doi.org/10.4050/sm-2024-tvf-5116
- Uppoor, Vivek, Mrinalgouda Patil, and Inderjit Chopra. 2025a. “Aeromechanics Investigation of a Full-Wing Lift-Compounded Slowed Rotor.” Journal of the American Helicopter Society 71 (1): 1–17. https://doi.org/10.4050/jahs.71.012007
- Uppoor, Vivek, Howard Zheng, and Inderjit Chopra. 2025b. “High Advance Ratio Wind Tunnel Testing of a Slowed Mach-Scaled Rotor with Full-Wing and Trailing Propeller Lift and Thrust Compounding.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0343
- V-22 and AW609 Tiltrotors. 2018. Wiley. https://doi.org/10.1002/9781119505433.ch4
- V/STOL Conference, Palo Alto, Calif., June 6-8, 1977, Technical Papers. 1977. NASA. https://ntrs.nasa.gov/citations/19770052074
- V/STOL Flight Simulation. 1979. NASA-TM-81156. NASA. https://ntrs.nasa.gov/citations/19800003850
- “V/STOL R & D in France.” 1971. Aircraft Engineering and Aerospace Technology 43 (11): 20–23. https://doi.org/10.1108/eb034831
- V/STOL Tilt Rotor Aircraft Study. Volume 1: Conceptual Design of Useful Military And/or Commercial Aircraft. 1972a. NASA-CR-114437. NASA. https://ntrs.nasa.gov/citations/19730014237
- V/STOL Tilt Rotor Aircraft Study. Volume 2: Preliminary Design of Research Aircraft. 1972b. NASA-CR-114438. NASA. https://ntrs.nasa.gov/citations/19730014238
- V/STOL Tilt Rotor Research Aircraft. Volume 2: Ship 1 Instrumentation. 1978a. NASA-CR-166348. NASA. https://ntrs.nasa.gov/citations/19820016319
- V/STOL Tilt Rotor Research Aircraft. Volume 3: Ship 2 Instrumentation. 1978b. NASA-CR-166349. NASA. https://ntrs.nasa.gov/citations/19820016320
- V/STOL Tilt Rotor Research Aircraft. Volume 4: CFE Technical Data. 1980. NASA-CR-166350. NASA. https://ntrs.nasa.gov/citations/19820016321
- V/STOL Tilt-Rotor Study, Task 2. Volume 2: Research Aircraft Design. 1972. NASA-CR-114442. NASA. https://ntrs.nasa.gov/citations/19730013200
- “V/STOL: World Wide View: British Aircraft Corporation.” 1971. Aircraft Engineering and Aerospace Technology 43 (11): 6–10. https://doi.org/10.1108/eb034828
- Vadyak, Joseph, George E. Shrewsbury, Jim C. Narramore, Gary Montry, Terry Holst, and Dochan Kwak. 1995. “Navier-Stokes Aerodynamic Simulation of the V-22 Osprey on the Intel Paragon MPP.” In Computational Aeroscience Workshop. https://ntrs.nasa.gov/citations/20020012216
- Valco, Mark J., Christopher DellaCorte, and Kevin C. Radil. 2003. Oil-Free Technology for Rotorcraft Propulsion. https://doi.org/10.4050/sm_prop_2003-3682
- Valentine, Taylor. 2022. “Drag and Power Impacts of Heat Removal in High-Speed Rotorcraft: Trending and Optimization.” SAE technical papers on CD-ROM/SAE technical paper series. https://doi.org/10.4271/2022-01-0056
- van ‘t Hoff, Stefan, Kees Kapteijn, Oliver Schneider, Keith Soal, and Federico Fonte. 2024. “Whirl Flutter Testing of ATTILA Tiltrotor Testbed: Initial Results.” In Proceedings of the Vertical Flight Society 80th Annual Forum and Technology Display. The Vertical Flight Society. https://doi.org/10.4050/f-0080-2024-1117
- van ‘t Hoff, Stefan, Jelmer van Vilsteren, Alessandro Cocco, and Pierangelo Masarati. 2023. “Design of a Tiltrotor Semi-Span Wind Tunnel Model for Whirl Flutter Investigations.” In AIAA SCITECH 2023 Forum. AIAA 2023-1306. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-1306
- van Aken, Johannes M. 1991. “Alleviation of Whirl-Flutter on Tilt-Rotor Aircraft Using Active Controls.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f47-2043
- Van Decker, William A. 1992. “Piloted Simulator Investigations of a Civil Tilt-Rotor Aircraft on Steep Instrument Approaches.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f48-9903
- van der Wall, Berend. 2011. “Helicopter Rotor BVI Airloads Computation Using Advanced Prescribed Wake Modelling.” In 29th AIAA Applied Aerodynamics Conference. AIAA 2011-3374. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2011-3374
- Van Wyckhouse, James F. 1966. High-Performance UH-1 Compound Helicopter Maneuver Flight Test Program. Defense Technical Information Center. https://doi.org/10.21236/ad0630927
- Vanaken, Johannes M. 1991. “Alleviation of Whirl-Flutter on a Joined-Wing Tilt-Rotor Aircraft Configuration Using Active Controls.” In International Specialists’’ Meeting on Rotorcraft Basic Research of the American Helicopter Society. https://ntrs.nasa.gov/citations/19940031929
- vanAken, Johannes M., and Jeffrey D. Sinsay. 2006. “Preliminary Sizing of 120-Passenger Advanced Civil Rotorcraft Concepts.” In AHS International Vertical Lift Aircraft Design Conference. https://ntrs.nasa.gov/citations/20070018200
- Vance, John M. 1974. High-Speed Rotor Dynamics: An Assessment of Current Technology for Small Turboshaft Engines. Defense Technical Information Center. https://doi.org/10.21236/ad0787319
- VanderVliet, Gery. 1992. “The Test, Evaluation, Development, and Use of a Manned Flight Simulator to Support Navy Developmental Testing of the V-22 Osprey.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/921978
- Varga, Béla. 2022. “Arriel 2E Turboshaft Hajtómű, a Megbízható Erőforrás: A Honvédelmi és Haderőfejlesztési Program Helikopterbeszerzései.” Haditechnika 56 (3): 8–14. https://doi.org/10.23713/ht.56.3.02
- Varga, Béla, and Gábor Barta. 2020. “Az Arriel 2E Turboshaft Hajtómű Termikus Elemzése.” Repüléstudományi Közlemények 32 (3): 69–82. https://doi.org/10.32560/rk.2020.3.6
- Vasilescu, Roxana. 2006. “Rotor Wake Capture Improvement Based on the Controlled Grid Resolution.” In 44th AIAA Aerospace Sciences Meeting and Exhibit. AIAA 2006-1151. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-1151
- Vasilescu, Roxana, and Stefan Dancila. 2006. “Rotor Wake Modifications in Hover Using Unsteady Spanwise Blowing.” In 44th AIAA Aerospace Sciences Meeting and Exhibit. AIAA 2006-1065. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2006-1065
- Vause, C. Rande, Frederic H. Schmitz, and D. A. Boxwell. 1976. “High-Speed Helicopter Impulsive Noise.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f32-0005
- Vayalali, Praneet, Farhan S. Gandhi, and Michael McKay. 2021. “Fault-Tolerant Control Allocation on a Compound Helicopter in Cruise.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16830
- Vayalali, Praneet, Michael E. McKay, and Farhan S. Gandhi. 2020. “Redistributed Pseudoinverse Control Allocation for Actuator Failure on a Compound Helicopter.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0076-2020-16292
- Velkoff, H. R. 1981. “Hover Tests of a Model H-Force Rotor.” In DGLR Seventh European Rotorcraft and Powered Lift Aircraft Forum. https://ntrs.nasa.gov/citations/19820010285
- Veno, Lester B. 1967. “An Examination of the Propulsion System for the Compound Helicopter.” In ASME 1967 Gas Turbine Conference and Products Show. American Society of Mechanical Engineers. https://doi.org/10.1115/67-gt-18
- Veno, L. B. 1974. “The Impact of Advanced Turboshaft Engine Technology on T700-Powered Helicopter Systems.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f30-038
- Veres, Joseph P. 2009. “Compressor Study to Meet Large Civil Tilt Rotor Engine Requirements.” In American Helicopter Society 65th Annual Forum and Technology Display. https://ntrs.nasa.gov/citations/20090015385
- Veres, Joseph P., and Douglas R. Thurman. 2010. “Conceptual Design of a Two Spool Compressor for the NASA Large Civil Tilt Rotor Engine.” In American Helicopter Society 66th Annual Forum. https://ntrs.nasa.gov/citations/20100022146
- Verma, Ajay, and John Junkins. 2000. “Trajectory Generation for Transition from VTOL to Wing-Borne Flight Using Inverse Dynamics.” In 38th Aerospace Sciences Meeting and Exhibit. AIAA 2000-971. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2000-971
- Vertical/short Takeoff and Landing (V/STOL). n.d. McGraw-Hill Professional. https://doi.org/10.1036/1097-8542.900600
- Vick, Michael J., Andrew Heyes, and Keith Pullen. 2009. “Design Overview of a Three-Kilowatt Recuperated Ceramic Turboshaft Engine.” In Volume 5: Microturbines and Small Turbomachinery; Oil and Gas Applications. ASMEDC. https://doi.org/10.1115/gt2009-60297
- Vick, Michael J., Andrew Heyes, and Keith Pullen. 2010. “Design Overview of a Three Kilowatt Recuperated Ceramic Turboshaft Engine.” Journal of Engineering for Gas Turbines and Power 132 (9): 092301. https://doi.org/10.1115/1.4000585
- Vijayaraj, Aditya Suvithiraj Rajendiran, Zachary T. Moore, and Vrishank Raghav. 2025. “Downwash and Outwash of Counter-Rotating Coaxial Rotors Hovering in-Ground Effect.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0081-2025-0396
- Vinicius Rodrigues de Lima, Marcus, and Davi Antônio dos Santos. 2025. “A Review on Flight Control for Multi-Tiltrotor Aerial Vehicles.” In Proceedings of the 28th International Congress of Mechanical Engineering. ABCM. https://doi.org/10.26678/abcm.cobem2025.cob2025-0038
- Virasak, Jacques. 2022. “A Brief History of Kaman Innovative VTOL Aircraft and System Designs.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0078-2022-1207
- Vogler, R. D. 1966. Ground Effects on Single-Jet and Multiple-Jet VTOL Models at Transition Speeds over Stationary and Moving Ground Planes. NASA-TN-D-3213. NASA. https://ntrs.nasa.gov/citations/19660005942
- Vogt, Robert L. 1991. “Future Trends in Turboshaft Engines up to the 5000 Horsepower Class.” In Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/91-gt-074
- Vogt, Robert L., and Arun Sehra. 1993. “Next Generation 2 MW Turboshaft and Turboprop Engines.” In Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/93-gt-046
- Vorwald, John. 2009. Tiltrotor Autorotation Characteristics Using Comprehensive Analysis. https://doi.org/10.4050/vfs-f65-000228
- Vorwald, John, and Inderjit Chopra. 1991. “Stabilizing Pylon Whirl Flutter on a Tilt-Rotor Aircraft.” In 32nd Structures, Structural Dynamics, and Materials Conference. AIAA 1991-1259. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1991-1259
- Vos, David, Chris Brown, and Shirley Kozler. 2002. “Implementation and Flight Testing Multivariable Parameter Dependent Control Laws on a Quarter Scale Tailless UCAV Demonstrator Aircraft.” In 1st UAV Conference. AIAA 2002-3428. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-3428
- Voskuijl, Mark, and Daniel J. Walker. 2007. “Active Control of Flight Path and Critical Loads in Tilt-Rotor Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f63-000161
- “VTOL Aircraft Control Design.” 2010. In Multiple Scales Theory and Aerospace Applications. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/5.9781600867644.0307.0316
- W., C., Alex Sheikman, and Thomas R. Norman. 2019. “High-Speed Wind Tunnel Tests of a Full-Scale Proprotor on the Tiltrotor Test Rig.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14736
- Wadcock, Alan J., Gloria K. Yamauchi, and Michael Rutkowski. 2001. Vortex Wake Geometry of a Model Tilt Rotor in Forward Flight. Aerospace Computing, Inc. https://ntrs.nasa.gov/citations/20020043250
- Waesche, J., and D. Midgal. 1975. “High-Performance Jet-V/STOL Development.” In Aircraft Systems and Technology Meeting. AIAA 1975-1013. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1975-1013
- Waite, Josiah, Andrew Kreshock, Jinwei Shen, and Kyle Nelson. n.d. “X-57 Whirl Flutter & Propeller Stability Assessments.” In Aerospace Flutter and Dynamics Council Meeting. https://ntrs.nasa.gov/citations/20230006165
- Wakefield, James E., Dorian P. Jones, Ann Gaitonde, and Sofia Medina. 2019. “Coupled Flight Mechanics Based on Reduced Order Models for Use in Tiltrotor Stability Analysis.” In AIAA Aviation 2019 Forum. AIAA 2019-3606. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-3606
- Wallscheid, L., F. Eulitz, and R. Heinecke. 1998. “Investigation of Unsteady Flow Phenomena in a Counterrotating Ducted Propfan.” In Volume 1: Turbomachinery. American Society of Mechanical Engineers. https://doi.org/10.1115/98-gt-251
- Wang, Ya. n.d. “The Design, Prototyping, Modeling and Flight Tests of a Vertical Take-off and Landing (VTOL) Unmanned Aerial Vehicle (UAV).” PhD diss., The Hong Kong University of Science and Technology. https://doi.org/10.14711/thesis-991012535962203412
- Wang, Xing, André Bauknecht, Shashank Maurya, and Inderjit Chopra. 2019b. “Wind Tunnel Test on a Slowed Mach-Scaled Hingeless Rotor at High Advance Ratios.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14582
- Wang, Fang, and Ming Chen. 2012. “Compound Helicopter Optimum Design Based on Genetic Algorithm.” Advanced materials research 591-593: 92–95. https://doi.org/10.4028/www.scientific.net/amr.591-593.92
- Wang, Zhicun, and Ping-Chih Chen. 2015. “Whirl Flutter Analysis with Propeller Aerodynamic Derivatives Computed by Unsteady Vortex Lattice Method.” In 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2015-1419. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1419
- Wang, Luofeng, Renliang Chen, Xin Xie, and Ye Yuan. 2024b. “Modeling and Full Speed Range Transition Strategy for a Compound Helicopter.” Preprint, . https://doi.org/10.2139/ssrn.5005015
- Wang, J., M. Demiroz, and P. Talbot. 1986. “Flight Test Planning and Parameter Extraction for Rotorcraft System Identification.” In 3rd Flight Testing Conference and Technical Display. AIAA 1986-9772. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-9772
- Wang, James M., Christopher T. Jones, and Mark W. Nixon. 1999. “A Variable Diameter Short Haul Civil Tiltrotor.” In 55th Annual Forum of the American Helicopter Society. https://ntrs.nasa.gov/citations/20040086741
- Wang, Xing, Yong Su Jung, James D. Baeder, and Inderjit Chopra. 2018a. “CFD Pressure/Airload Correlation with Experimental Data on a Slowed Mach-Scaled Rotor at High Advance Ratios.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12694
- Wang, Xing, Yong Su Jung, James D. Baeder, and Inderjit Chopra. 2020a. “Blade Structural Load/Airload Correlation on a Slowed Mach-Scaled Rotor at High Advance Ratios.” Journal of the American Helicopter Society 65 (4): 1–14. https://doi.org/10.4050/jahs.65.042003
- Wang, X., G. Li, Y. Zhao, J. Li, L. Zhang, and M. Luo. 2026b. “Aerodynamic Interaction Analysis of a Tiltrotor Electric Vertical Takeoff and Landing Aircraft: A Comparative Study of Tiltrotor and Tiltwing Configurations.” Journal of Applied Fluid Mechanics 19 (9). https://doi.org/10.47176/jafm.19.9.4322
- Wang, Yong, Jie Song, Wencheng Zhong, and Haibo Zhang. 2023c. “Rotational Speed Optimization of Coaxial Compound Helicopter and Turboshaft Engine System.” Journal of Aerospace Engineering 36 (5): 04023042. https://doi.org/10.1061/jaeeez.aseng-4546
- Wang, Ji C., and Peter D. Talbot. 1987. “Determination of Rotor Derivatives and Rotor Hub Force and Moment Derivatives from Flight Measurements with the RSRA Compound Helicopter.” In Society of Flight Test Engineers. https://ntrs.nasa.gov/citations/19880064234
- Wang, Ji C., and Peter D. Talbot. 1989. “Identification of Rotor Flapping Equation of Motion from Flight Measurements with the RSRA Compound Helicopter.” Vertica 13 (3 19). https://ntrs.nasa.gov/citations/19900025714
- Wang, Xing, Lauren N. Trollinger, and Inderjit Chopra. 2020d. “Refined Performance Results on a Slowed Mach-Scaled Rotor at High Advance Ratios.” Journal of the American Helicopter Society 65 (1): 1–13. https://doi.org/10.4050/jahs.65.012003
- Wang, Qi, and Wu Wen-hai. 2014. “Modelling and Analysis of Tiltrotor Aircraft for Flight Control Design.” Information Technology Journal 13 (5): 885–94. https://doi.org/10.3923/itj.2014.885.894
- Wang, Bin, Youxu Yang, Junquan Fu, Junhui Shen, and Wenshuo Yang. 2025c. “Design and Validation of Rotor Mode Control for a Tilt-Wing Aircraft.” Journal of Physics: Conference Series 2977 (1): 012004. https://doi.org/10.1088/1742-6596/2977/1/012004
- Wang, Yu, Xinrong Zhang, Jun Zhang, and Aijun Li. 2025h. “Integrated VFEGO Planner and Response-Type-Aware Saturated MRAC for Coaxial Compound Helicopter Ship-Landing.” Preprint, . https://doi.org/10.2139/ssrn.5851128
- Wang, Huanjin, and Gao Zheng. 2004. Design of the Scheme of High-Speed Helicopter RD15. https://doi.org/10.4050/vfs-f60-000123
- Wang, Yong, Qiangang Zheng, Haibo Zhang, and Haoying Chen. 2020e. “Study on Inversion Control for Integrated Helicopter/engine System with Variable Rotor Speed Based on State Variable Model.” International Journal of Turbo & Jet-Engines 40 (1): 21–29. https://doi.org/10.1515/tjj-2020-0018
- Wang, Yong, Qiangang Zheng, Haibo Zhang, and Zhigui Xu. 2018b. “Research on Integrated Control Method of Tiltrotor with Variable Rotor Speed Based on Two-Speed Gearbox.” International Journal of Turbo & Jet-Engines 38 (2): 173–83. https://doi.org/10.1515/tjj-2018-0004
- Wansong, J. F. 1983. “T700 Engine: Designed for the Pilot and Mechanic.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f39-010
- Ward, John. 1989. “The Design Challenge of Applying Tiltrotor Technology to the Civil Mission.” In Aircraft Design and Operations Meeting. AIAA 1989-2067. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2067
- Ward, Elizabeth, Inderjit Chopra, and Anubhav Datta. 2017. “Design of Self-Twisting Rotor Blades for High-Speed Compound Rotorcraft.” In 25th AIAA/AHS Adaptive Structures Conference. AIAA 2017-0292. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2017-0292
- Wareing, Joel T. 1968. “Consideration of V/STOL Downwash and the Ground Environment.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/680282
- Warren, Matthew, Frank K. Kozel, Eddie Li, Chris Hall, and Brian German. 2019. “Design and Control Evaluation of a Novel Subscale Quad-Tiltrotor.” In AIAA Scitech 2019 Forum. AIAA 2019-0529. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-0529
- Warren, Theodore, and Cristina Riso. 2024. “Sliding-Window Matrix Pencil Method for Whirl Flutter Bifurcation Analysis.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1271
- Warsop, Clyde, and William Crowther. 2019. “NATO AVT-239 Task Group: Flight Demonstration of Fluidic Flight Controls on the MAGMA Subscale Demonstrator Aircraft.” In AIAA Scitech 2019 Forum. AIAA 2019-0282. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-0282
- Waśniewska, Sara, Tomasz Józef Cioć, and Sebastian Topczewski. 2025. “Integrated Automatic Control of the ARCHER Compound Helicopter.” Aircraft Engineering and Aerospace Technology 97 (9): 1029–42. https://doi.org/10.1108/aeat-04-2025-0136
- Watkins, John E. 1991. Overland Combat Search and Rescue: A Real Fix to an Old Problem. Defense Technical Information Center. https://doi.org/10.21236/ada236670
- Weber, T. L., R. E. Wilson, and S. N. Walker. 1991. Analysis of a Teetered, Variable-Speed Rotor: Final Report. Office of Scientific and Technical Information (OSTI). https://doi.org/10.2172/5719578
- Wechsler, James K., and John W. Rutherford. 1995. Wingtip Mounted, Counter-Rotating Proprotor for Tiltwing Aircraft. Patent Number: US-PATENT-5,381,985. Ames Research Center. https://ntrs.nasa.gov/citations/20080004794
- Weeks, T. 1986. “X-29 Advanced Technology Integration for Tomorrow’s Fighter Aircraft.” In Aircraft Systems, Design and Technology Meeting. AIAA 1986-2613. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-2613
- Wei, Jun, Wei Gao, Wenxuan Gao, Bei Lu, and Qifu Li. 2024. “Aerodynamic Simulations of an Electric Vertical Takeoff and Landing Aircraft Using Reformulated Vortex Particle Method.” Physics of Fluids 36 (6): 065114. https://doi.org/10.1063/5.0212347
- Weiand, Peter, Dominik B. Schwinn, and Kagan Atci. 2024. “High-Speed Compound Rotorcraft Performance and Design.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0080-2024-1150
- Weiberg, J. A., and M. D. Maisel. 1980. Wind-Tunnel Tests of the XV-15 Tilt Rotor Aircraft. NASA-TM-81177. NASA. https://ntrs.nasa.gov/citations/19800015802
- Weinberg, M., and John Wyzykowski. 2001. “Development and Testing of a Commercial Turbofan Engine for High Altitude UAV Applications.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/2001-01-2972
- Welch, Gerard E. 2010. “Assessment of Aerodynamic Challenges of a Variable-Speed Power Turbine for Large Civil Tilt-Rotor Application.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f66-000273
- Weller, W., and W. Warmbrodt. 1983. “Measured Inplane Stability Characteristics in Hover for an Advanced Bearingless Rotor.” In 24th Structures, Structural Dynamics and Materials Conference. AIAA 1983-987. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1983-987
- Wellman, Brent. 1992. “Advanced Technology Blade Testing on the XV-15 Tilt Rotor Research Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f48-9902
- Wells, Valana L. 1996. Genetic Algorithms in Conceptual Design of a Light-Weight, Low-Noise, Tilt-Rotor Aircraft. NASA-CR-201404. NASA. https://ntrs.nasa.gov/citations/19960027954
- Wells, H., Jr., and W. Yinger. 1964. “V/stol Structural Influence on Military Operations.” In Military Aircraft Systems and Technology Meeting. AIAA 1964-778. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-778
- Welsh, Daniel J., Paul King, Frederick Schauer, and John Hoke. 2014. “RDE Integration with T63 Turboshaft Engine Components.” In 52nd Aerospace Sciences Meeting. AIAA 2014-1316. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2014-1316
- Wenren, Yonghu, and John Steinhoff. 2009. “Rotor Wake Computing with Lifting Lines and Vorticity Confinement.” In 27th AIAA Applied Aerodynamics Conference. AIAA 2009-3859. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2009-3859
- Wernicke, Kenneth G. 1969. “Tilt Proprotor Composite Aircraft, Design State of the Art.” Journal of the American Helicopter Society 14 (2): 10–25. https://doi.org/10.4050/jahs.14.2.10
- Wernicke, Kenneth G. 1977. “Performance and Safety Aspects of the XV-15 Tilt Rotor Research Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f33-010
- Wernicke, R. 1980. “A Tilt Rotor Design That Provides Economical Extended Range VTOL Transportation to Offshore Oil Platforms.” In Aircraft Systems Meeting. AIAA 1980-1822. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-1822
- Wernicke, R. 1981. “Prediction of Tilt Rotor Outwash.” In 19th Aerospace Sciences Meeting. AIAA 1981-13. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-13
- Wernicke, Kenneth G., and H. Kipling Edenborough. 1972. “Full-Scale Proprotor Development.” Journal of the American Helicopter Society 17 (1): 31–40. https://doi.org/10.4050/jahs.17.31
- Wernicke, K. G., and J. P. Magee. 1979. “XV-15 Flight Test Results Compared with Design Goals.” In American Institute of Aeronautics and Astronautics. https://ntrs.nasa.gov/citations/19790065323
- Wernicke, Rodney K., Kenneth G. Wernicke, and Dean C. Borgman. 1980. “Mission Potential of Derivatives of the XV-15 Tilt Rotor Research Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f36-011
- Weslet, John, and Louis C. Sutherland. 1987. “Sound Propagation and Community Noise Exposure Considerations for Enroute Noise of Advanced Turboprop Aircraft.” Journal of the Acoustical Society of America 82 (S1): S113-S113. https://doi.org/10.1121/1.2024592
- Westbrook, C. 1964. “Handling Qualities of Vtol Aircraft.” In Military Aircraft Systems and Technology Meeting. AIAA 1964-777. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1964-777
- “Whirl Flutter Optimisation-Based Solution of Twin Turboprop Aircraft Using a Full-Span Model.” 2017. Applied and Computational Mechanics. https://doi.org/10.24132/acm.2017.324
- Whitaker, H. P., and Y. Cheng. 1975. Use of Active Control Systems to Improve Bending and Rotor Flapping Response of a Tilt Rotor VTOL Airplane. NASA-CR-137815. NASA. https://ntrs.nasa.gov/citations/19760011056
- Whitcomb, Darrel D. 2006. Combat Search and Rescue in Desert Storm. Defense Technical Information Center. https://doi.org/10.21236/ada459903
- White, Richard P. 1969. “Instabilities Associated with a Rotor Blade Stopped in Flight.” Journal of the American Helicopter Society 14 (2): 3–9. https://doi.org/10.4050/jahs.14.2.3
- White, Jonathan, Brandon Ennis, and Thomas G. Herges. 2018. “Estimation of Rotor Loads Due to Wake Steering.” In 2018 Wind Energy Symposium. AIAA 2018-1730. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-1730
- White, K. C., B. A. Lampkin, and H. Andrews. 1985. Future of V/STOL Aircraft Systems: A Survey of Opinions. NASA-TM-86689. NASA. https://ntrs.nasa.gov/citations/19850020625
- Whiteside, Siena K. S., Beau P. Pollard, Kevin R. Antcliff, et al. 2021. Design of a Tiltwing Concept Vehicle for Urban Air Mobility. NASA/TM-20210017971. NASA. https://ntrs.nasa.gov/citations/20210017971
- Whitlow, J. B., and G. K. Sievers. 1988. “NASA Advanced Turboprop Research and Concept Validation Program.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/881164
- Whitt, Jonah, and Farhan S. Gandhi. 2023. “Optimal Operation of Rotor-Wing Assemblies on eVTOL Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18008
- Whittely, D. C. 1979. “The External Augmentor Concept for V/STOL Aircraft.” In NASA. Ames Res. Center Workshop on Thrust Augmenting Ejectors. https://ntrs.nasa.gov/citations/19800001893
- Whitten, J. B. 1960. Operational Aspects of v STOL Aircraft. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19630004825
- Wilcox, D., and H. Quigley. 1978. “V/STOL Aircraft Simulation: Requirements and Capabilities at Ames Research Center.” In Aircraft Systems and Technology Conference. AIAA 1978-1515. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1978-1515
- Wilcox, D. E., and M. D. Shovlin. 1975. Benefits of VTOL Aircraft in Offshore Petroleum Logistics Support. NASA-TM-X-73098. NASA. https://ntrs.nasa.gov/citations/19760010999
- Wilkerson, Joseph B. 1988. A Look at Tomorrow’s Civil Tiltrotor. SAWE PAPER 1820. Boeing Helicopters. https://ntrs.nasa.gov/citations/19890063445
- Wilkerson, J. B., J. J. Schneider, and K. M. Bartie. 1991. Technology Needs for High-Speed Rotorcraft, Volume 1. NASA-CR-177585. NASA. https://ntrs.nasa.gov/citations/19910016825
- Williams, R. C., and A. H. Ybarra. 1981a. “Low Speed Testing of the Inlets Designed for a Tamden-Fan V/STOL Nacelle.” In V/STOL Conf.. https://ntrs.nasa.gov/citations/19820003169
- Williams, R. C., and A. H. Ybarra. 1981b. “Low Speed Testing of the Inlets Designed for a Tandem-Fan V/STOL Nacelle.” In V/STOL Conference. https://ntrs.nasa.gov/citations/19820035675
- Willis, W. 1980a. “The Effect of Cross-Shafting on Engine-out Vertical Landing Reliability of V/STOL Aircraft.” In Aircraft Systems Meeting. AIAA 1980-1858. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-1858
- Willis, W. 1980b. “The Effects of Turbine Inlet Temperature and Engine Complexity on VCE/RALS Powered Supersonic V/STOL Aircraft.” In Aircraft Systems Meeting. AIAA 1980-1853. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1980-1853
- Willis, W. S., and D. C. Genever-Watling. 1977. “The Application of QCSEE Technology to V/STOL.” In NASA Ames Research Center. https://ntrs.nasa.gov/citations/19770052115
- Willshire, W., Jr., and R. Martin. 1984. “Noise and Performance Characteristics of a Model Scale X-Wing Rotor System in Hover.” In 22nd Aerospace Sciences Meeting. AIAA 1984-337. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-337
- Wilson, J. C., and R. E. Mineck. 1974. Wind Tunnel Investigation of Helicopter Rotor Wake Effects on Three Helicopter Fuselage Models. NASA-TM-X-3185-SUPPL. NASA. https://ntrs.nasa.gov/citations/19750012222
- Wilson, J. C., R. E. Mineck, and C. E. Freeman. 1976. Aerodynamic Characteristics of a Powered Tilt-Proprotor Wind Tunnel Model. NASA-TM-X-72818. NASA. https://ntrs.nasa.gov/citations/19760020125
- Wilson, Elias, and Richard J. Prazenica. 2020. “Autonomous Autorotation of Tilt Rotor Aircraft Using Nonlinear Model Predictive Control.” In AIAA Scitech 2020 Forum. AIAA 2020-1488. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-1488
- Wilson, S. B., III, J. V. Bowles, and J. D. Foster. 1981a. “Analysis of Selected VTOL Concepts for a Civil Transportation Mission.” In V/STOL Conference. https://ntrs.nasa.gov/citations/19820035685
- Wilson, S., III, G. Kidwell Jr., and R. Christiansen. 1981b. “Numerical and Classical Analysis of V/STOL Aircraft Using Selected Propulsion Systems.” In Aircraft Systems and Technology Conference. AIAA 1981-1676. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-1676
- Winston, M., R. Weston, and R. Mineck. 1975. “Propulsion-Induced Interference Effects on Jet-Lift VTOL Aircraft.” In 11th Propulsion Conference. AIAA 1975-1215. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1975-1215
- Wolkovitch, J. 1984. “Joined-Wing Research Airplane Feasibility Study.” In Aircraft Design Systems and Operations Meeting. AIAA 1984-2471. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1984-2471
- Wolkovitch, Julian, and Billy B. Brassell. 1978. VOLAR: A Digital Computer Program for Simulating VSTOL Aircraft Launch and Recovery from Small Ships. Volume II. Appendices. Defense Technical Information Center. https://doi.org/10.21236/ada066173
- Wolkovitch, J., and R. Fortenbaugh. 1978. “Nacelle Effects on Stability of VSTOL Configurations Including Conventional, Canard, and Tandem Wing Arrangements.” In Aircraft Systems and Technology Conference. AIAA 1978-1504. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1978-1504
- Wolkovitch, Julian, and John A. Hoffman. 1971. Stability and Control of Helicopters in Steep Approaches. Volume 4. Derivatives and Transfer Functions for the AH-56A Compound Helicopter and Data on Low-Altitude Turbulence Representation. Defense Technical Information Center. https://doi.org/10.21236/ad0730363
- Wolkovitch, Julian, Barnaby Wainfan, Yitzhak Ben-Harush, and Wayne Johnson. 1989. Application of the Joined Wing to Tiltrotor Aircraft. NASA-CR-177543. NASA. https://ntrs.nasa.gov/citations/19900005777
- Wong, Tin-Chee. 2008. “The Impact of Advanced Airfoils on Rotor Hover Performance.” In 26th AIAA Applied Aerodynamics Conference. AIAA 2008-7342. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2008-7342
- Wong, Oliver, and Philip Tanner. 2010. “Photogrammetric Measurements of an EH-60L Brownout Cloud.” In Proceedings of the Vertical Flight Society Forum 66 - Phoenix, AZ 2010. The Vertical Flight Society. https://doi.org/10.4050/vfs-f66-000407
- Wood, Edward. 1972. Significant Development Areas for Future V/STOL Wind Tunnel Testing. https://doi.org/10.4050/sm_vstol_1972-4240
- Wood, Tom L., John Liu, and Michael A. McVeigh. 1995. “Aerodynamic Development of a Forebody Strake for the V-22 Osprey.” In Vertical Flight Society Forum. https://doi.org/10.4050/vfs-f51-3005
- Wood, T. L., and Martin Peryea. 1995. “Reduction of Tiltrotor Download.” Journal of the American Helicopter Society 40 (3): 42–51. https://doi.org/10.4050/jahs.40.42
- Woods, Robert J. 1957. “Convertiplanes and Other VTOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/570017
- Woods, Jessica A., Michael G. Gilbert, and Terrence A. Weisshaar. 1989. Results of a Parametric Aeroelastic Stability Analysis of a Generic X-Wing Aircraft. NASA-TM-101572. NASA. https://ntrs.nasa.gov/citations/19890014953
- Woodward, Richard. 1987. “Measured Noise of a Scale Model High Speed Propeller at Simulated Takeoff/approach Conditions.” In 25th AIAA Aerospace Sciences Meeting. AIAA 1987-526. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1987-526
- Woollett, R. 1981. “Thrust Modulation Methods for a Subsonic V/STOL Aircraft.” In AIAA and NASA Ames VSTOL Conference. AIAA 1981-2633. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1981-2633
- Wright, R. H. 1968. Test Sections for Small Theoretical Wind-Tunnel-Boundary Interference on V/STOL Models. NASA-TR-R-286. NASA. https://ntrs.nasa.gov/citations/19680022120
- Wright, David L., and Burton A. Jones. 1970. Convertible Fan/Shaft Engine Variable Fan Geometry Investigation. Defense Technical Information Center. https://doi.org/10.21236/ad0873018
- Wright, Stephen, and Christopher Silva. 2026. RAVEN Proprotor Performance and Aeroelastic Stability Predictions. https://doi.org/10.4050/sm-2026-vlada-5167
- Wu, Rong, Xiayang Zhang, Qijun Zhao, and Bo Wang. 2022. “Flight Dynamics Modeling and Flight Performance Analysis of Variable Rotor Speed and Variable Diameter of Tilt-Rotor Aircraft.” In Lecture Notes in Electrical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-19-2635-8_61
- Wyrick, Donald R. 1965. Extension of the High-Speed Flight Envelope of the XH-51A Compound Helicopter. Defense Technical Information Center. https://doi.org/10.21236/ad0627372
- Xia, Shuangman, Changliang Lin, Jinliang Wang, and Haibin Xu. 2025. “Analysis of the Influence of Parameters on the Whirl Flutter Stability of Tiltrotor Aircraft.” In Lecture Notes in Mechanical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-97-9768-4_33
- Xiao, Sid, David Belt, Pietro D’Ettorre, and Paul Edwards. 2018a. “Control Margin Awareness of the AW609 TiltRotor under Asymmetric Aerodynamic Flight Conditions.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0074-2018-12791
- Xiao, Chang-Geng, and Zi-Xiang Tong. 2025. “A Novel Multi-Parametric Methodology for Design and Multi-Objective Optimization of Turboshaft Airframe/engine Integrated Exhaust System.” Physics of Fluids 37 (7): 075228. https://doi.org/10.1063/5.0277400
- Xiao, X., J. J. Zhang, and Q. Zhang. 2018b. “Flight Control Reconfiguration of Unmanned Tiltrotor Aircraft.” IOP Conference Series: Materials Science and Engineering 439: 032103. https://doi.org/10.1088/1757-899x/439/3/032103
- Xin, Ji, Renliang Chen, and Pan Li. 2015. “Time-Stepping Free-Wake Methodology for Rotor Flow Field Simulation in Ground Effect.” Aircraft Engineering and Aerospace Technology 87 (5): 418–26. https://doi.org/10.1108/aeat-09-2013-0173
- Xin, Hong, J. Prasad, and D. Peters. 1998. “Unsteady Aerodynamics of Helicopter Rotor Hovering in Dynamic Ground Effect.” In 23rd Atmospheric Flight Mechanics Conference. AIAA 1998-4456. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1998-4456
- Xu, Yifan, Xueyun Wang, and Jingjuan Zhang. 2022. “Real-Time Parameter Identification Method for a Novel Blended-Wing-Body Tilt-Rotor UAV.” Preprint, . https://doi.org/10.2139/ssrn.4017228
- Xue, Min, and Ella Atkins. 2003. “Noise-Sensitive Final Approach Trajectory Optimization for Runway-Independent Aircraft.” In AIAA Guidance, Navigation, and Control Conference and Exhibit. AIAA 2003-5515. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2003-5515
- Xue, Min, and Ella Atkins. 2005. “Three-Dimensional Segmented Trajectory Optimization for Runway-Independent Aircraft.” In 43rd AIAA Aerospace Sciences Meeting and Exhibit. AIAA 2005-909. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2005-909
- XV-15: Tiltrotor. 1991. NASA-TM-109455. NASA. https://ntrs.nasa.gov/citations/19940010855
- Yamamoto, O. 1992. “Numerical Calculations of Propfan/swirl Recovery Vane Flow Field.” In 28th Joint Propulsion Conference and Exhibit. AIAA 1992-3771. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1992-3771
- Yamamoto, O., J. Barton, and L. Bober. 1986. “Improved Euler Analysis of Advanced Turboprop Propeller Flows.” In 22nd Joint Propulsion Conference. AIAA 1986-1521. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-1521
- Yamato, Hiroyuki, Noriaki Okada, and Toshio Bando. 1988. “Flight Test of the Japanese USB STOL Experimental Aircraft ASKA.” In 4th Flight Test Conference. AIAA 1988-2180. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-2180
- Yamauchi, Gloria K., Ruth M. Heffernan, and Michel Gaubert. 1988. “Correlation of SA349/2 Helicopter Flight Test Data with a Comprehensive Rotorcraft Model.” Journal of the American Helicopter Society 33 (2): 31–42. https://doi.org/10.4050/jahs.33.31
- Yamauchi, G. K., W. Johnson, and A. J. Wadcock. 2002. “Vortex Wake Geometry of a Model Tilt Rotor in Forward Flight.” In Heli Japan 2002, AHS International Meeting on Advanced Rotorcraft Technology and Life Saving Activities. https://ntrs.nasa.gov/citations/20080047682
- Yamauchi, Gloria K., Alan J. Wadcock, and Michael R. Derby. 2003. Measured Aerodynamic Interaction of Two Tiltrotors. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20030071086
- Yan, Xufei, Bin Lou, Anhuan Xie, Lingkai Chen, and Dan Zhang. 2021. “A Review of Advanced High-Speed Rotorcraft.” IOP Conference Series: Materials Science and Engineering 1102 (1): 012006. https://doi.org/10.1088/1757-899x/1102/1/012006
- Yan, Xufei, Ye Yuan, and Renliang Chen. 2023. “Research on Pilot Control Strategy and Workload for Tilt-Rotor Aircraft Conversion Procedure.” Preprint, . https://doi.org/10.20944/preprints202306.2005.v1
- Yang, Tao, Xi Chen, Qijun Zhao, and Guoqing Zhao. 2022b. “Numerical Study on the Noise Propagation Characteristics of Rotor in Non-Uniform Downwash Flowfield Based on Linearized Euler Equations.” International Journal of Aeroacoustics 21 (8): 731–65. https://doi.org/10.1177/1475472x221136883
- Yang, Xinyu, Riley J. Cox-Gross, Richard P. Anderson, and Kyle B. Collins. 2024a. “Advancements in High-Speed Vertical Takeoff and Landing (HSVTOL) Aircraft: Preliminary Design, Analysis, and Technological Innovations.” In AIAA SCITECH 2024 Forum. AIAA 2024-1474. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1474
- Yang, Xianhao, and Xiongfeng Deng. 2024. “Attitude Tracking Control for VTOL Aircraft with Uncertain Disturbances Based on Adaptive Neural Network ADRC Method.” Unmanned Systems 13 (04): 1053–64. https://doi.org/10.1142/s2301385025500657
- Yang, Lining, Jian Fu, Baoyan Hu, and Zhaoyi Zhou. 2024d. “Tiltrotor Conversion System Design and Flight Dynamics Simulation for VTOL Aircraft.” In Lecture Notes in Electrical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-97-4010-9_90
- Yang, Youxu, Guoning Huang, Dongqiang Zhao, and Chu Tang. 2015. “A New Whirl Flutter Analysis Method.” In 33rd AIAA Applied Aerodynamics Conference. AIAA 2015-2887. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-2887
- Yang, Sungmo, Taehun Lee, Hyuncheol Koo, Doohwan Yu, Youngju Chun, and Seongkook Kim. 2025a. “A Ground-Based Test Facility for Turboprop/Turboshaft Engine Development in Hanwha Aerospace.” In Volume 1: Aircraft Engine; Ceramics and Ceramic Composites. American Society of Mechanical Engineers. https://doi.org/10.1115/gt2025-151828
- Yang, Senlin, Haiqiang Zhang, Wei Liu, and Haibin Dong. 2025b. “Turboshaft Engine Modeling Based on the Volumetric Method and Anti-Jammer Controller Design.” Gas Turbine Experiment and Research 38 (6): 83–90. https://doi.org/10.3724/j.gter.20250078
- Yang, Baojun, Junhong Zhang, and Zhaorui Song. 2022a. “Design Method of Control Law of Tilt-Rotor Aircraft Based on Modal Characteristic Analysis.” In International Conference on Mechanisms and Robotics (ICMAR 2022), edited by Zeguang Pei. SPIE. https://doi.org/10.1117/12.2652289
- Yao, WenRong, Wenbo Li, JinDong Wu, and Chong Su. 2024. “Research on Cascade Control Method for Turboshaft Engine with Variable Rotor Speed.” International Journal of Turbo & Jet-Engines 41 (4): 853–63. https://doi.org/10.1515/tjj-2024-0004
- Yassini, Siamak, and George Syrovy. 2002. “Advanced Tiltrotor Technology VTOL Aircraft with a Single Rotor.” In AIAA’s Aircraft Technology, Integration, and Operations (ATIO) 2002 Technical Forum. AIAA 2002-5831. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2002-5831
- Yatsun, S. F., O. V. Emelyanova, Andres Santiago Martinez Leon, and Luis Miguel Mosquera Morocho. 2020. “Adaptive Control of a Nonlinear Convertiplane under Conditions of Uncertainty.” Proceedings of the Southwest State University 24 (3): 35–50. https://doi.org/10.21869/2223-1560-2020-24-3-35-50
- Yazar, I. 2018. “Simulation of a High Fidelity Turboshaft Engine-Alternator Model for Turboelectric Propulsion System Design and Applications.” International Journal of Turbo & Jet-Engines 0 (0). https://doi.org/10.1515/tjj-2018-0036
- Yazar, Isil. 2024. “Speed Controller Design for Turboshaft Engine Using a High-Fidelity AeroThermal Model.” International Journal of Turbo & Jet-Engines 42 (2): 347–54. https://doi.org/10.1515/tjj-2024-0060
- Ye, Huawen, Meng Li, and Neng Wan. 2020. “Landing Control Design for a VTOL Aircraft.” IET Control Theory & Applications 14 (6): 855–64. https://doi.org/10.1049/iet-cta.2018.6244
- Ye, Ying Zhe, Yu Liang, Xiaowen Shan, and Kefu Huang. 2026. “A Multi-Fidelity Deep Neural Network Method for Predicting Tiltrotor Aerodynamic Interaction during Transition Flight.” Preprint, . https://doi.org/10.2139/ssrn.7371642
- Yemenici, Oznur, Nilay Sezer-Uzol, and Oguz Uzol. 2010. “Investigation of Rotor-Rotor Interactions for Two Helicopters in Forward Flight Using Free-Vortex Wake Methodology.” In 28th AIAA Applied Aerodynamics Conference. AIAA 2010-4558. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2010-4558
- Yeo, Hyeonsoo, Cecil W. Acree, and Andrew R. Kreshock. 2017. “Comparison of CAMRAD II and RCAS Predictions of Tiltrotor Aeroelastic Stability.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0073-2017-12052
- Yeo, Hyeonsoo, Jeffrey Bosworth, Cecil W. Acree, and Andrew R. Kreshock. 2018. “Comparison of CAMRAD II and RCAS Predictions of Tiltrotor Aeroelastic Stability.” Journal of the American Helicopter Society 63 (2): 1–13. https://doi.org/10.4050/jahs.63.022001
- Yeo, Hyeonsoo, and Wayne R. Johnson. 2006a. “Aeromechanics Analysis of a Compound Helicopter.” In Vertical Flight Society Annual Forum & Technology Display (VFS Forum). https://doi.org/10.4050/vfs-f62-145
- Yeo, Hyeonsoo, and Wayne Johnson. 2006b. “Optimum Design of a Compound Helicopter.” In Heli Japan 2006 AHS International Meeting on Advanced Rotorcraft Technology and Lift Saving Activities. https://ntrs.nasa.gov/citations/20070017929
- Yeo, Hyeonsoo, Hao Kang, and Andrew R. Kreshock. 2021. “Modeling and Analysis of Proprotor Whirl Flutter.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16771
- Yeo, Hyeonsoo, and Andrew R. Kreshock. 2019. “Whirl Flutter Investigation of Hingeless Proprotors.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0075-2019-14580
- Yeo, Yih Tang, and Hugh H. Liu. 2018. “Transition Control of a Tilt-Rotor VTOL UAV.” In 2018 AIAA Guidance, Navigation, and Control Conference. AIAA 2018-1848. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-1848
- Yeo, Hyeonsoo, and Hossein Saberi. 2021. “Tiltrotor Conversion Maneuver Analysis with RCAS.” Journal of the American Helicopter Society. https://doi.org/10.4050/jahs.66.042010
- Yepifanov, Sergiy, and Oleksiy Bondarenko. 2022. “Development of Turboshaft Engine Adaptive Dynamic Model: Analysis of Estimation Errors.” Transactions on Aerospace Research 2022 (4): 59–71. https://doi.org/10.2478/tar-2022-0024
- Yillikci, Y., J. Prasad, S. Hanagud, and D. Schrage. 1993. “Blade Response Simulations of Flap Controlled Stopped Rotors.” In International Powered Lift Conference. AIAA 1993-4847. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1993-4847
- Ying, Zhang, and Ye Liang. 2013. “A Numerical Study on Tilt Rotor Aircraft Flow Fields and Aerodynamics in Transition Mode Based on Actuator Model and Unstructured Embedded Grid.” In 2013 International Powered Lift Conference. AIAA 2013-4381. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2013-4381
- Yomchinda, Thanan, Joseph Horn, and Neil Cameron. 2009. “Integrated Flight Control Design and Handling Qualities Analysis for a Tilt Rotor Aircraft.” In AIAA Atmospheric Flight Mechanics Conference. AIAA 2009-6058. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2009-6058
- Yoo, Sungyul, and Daniel Strash. 1989. “A Zonal Approach to V/STOL Vehicle Aerodynamics.” In 7th Applied Aerodynamics Conference. AIAA 1989-2168. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-2168
- Yoon, S., and J. Schetz. 1986. “Numerical Navier-Stokes Solutions of High Speed Propeller Flows.” In 22nd Joint Propulsion Conference. AIAA 1986-1538. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1986-1538
- Young, P. H. 1961. “Lift-Thrust Turbofan Engines for VTOL and STOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/610323
- Young, Larry A. 2015. “Simulated Tiltrotor Aircraft Operation in Close Proximity to a Building in Wind and Ground-Effect Conditions.” In 15th AIAA Aviation Technology, Integration, and Operations Conference. AIAA 2015-2700. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-2700
- Young, Larry A. 2018. “What Is a Tiltrotor? A Fundamental Reexamination of the Tiltrotor Aircraft Design Space.” In Aeromechanics Design for Transformative Vertical Flight (2018 AHS) - American Helicopter Society International Technical Meeting. https://ntrs.nasa.gov/citations/20180008648
- Young, Larry A. 2023. “Novel Tilting Ducted-Fan Aerial Vehicle Configurations.” In 10th Biennial Autonomous VTOL Technical Meeting & 10th Annual Electric VTOL Symposium. https://ntrs.nasa.gov/citations/20230000799
- Young, Larry A. 2024. “Novel Conceptual Designs for Stopped-Rotor Aerial Vehicles and Other High-Speed Rotorcraft.” In 2024 Transformative Vertical Flight. https://ntrs.nasa.gov/citations/20240000574
- Young, Larry, William Chung, Alfonso Paris, et al. 2011. “Civil Tiltrotor Aircraft Operations.” In 11th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference. AIAA 2011-6898. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2011-6898
- Young, Larry A., and Michael R. Derby. 2002. Rotor/Wing Interactions in Hover. NASA/TM-2002-211392. NASA. https://ntrs.nasa.gov/citations/20020076286
- Young, L. A., D. Lillie, M. McCluer, G. K. Yamauchi, and M. R. Derby. 2001. Insights into Airframe Aerodynamics and Rotor-on-Wing Interactions from a 0.25-Scale Tiltrotor Wind Tunnel Model. NASA Ames Research Center. https://ntrs.nasa.gov/citations/20090028801
- Young, Larry, and Ganesh Rajagopalan. 2013. “Simulated Rotor Wake Interactions Resulting from Civil Tiltrotor Aircraft Operations near Vertiport Terminals.” In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. AIAA 2013-801. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2013-801
- Young, Larry A., Gloria K. Yamauchi, Earl Booth, et al. 1998. Technology Investigations with the Tilt Rotor Aeroacoustic Model (TRAM). NASA Ames Research Center. https://ntrs.nasa.gov/citations/20020060661
- Yu, Li, Yong Ding, Peng Wang, Jialong Zhang, and Lei Ye. 2026. “Flight Control of a Novel Distributed Tiltrotor UAV with Experiments.” IET Control Theory & Applications 20 (1): e70102. https://doi.org/10.1049/cth2.70102
- Yu, Chen, Guo Haoran, and Zhang Haibo. 2025a. “An Integrated Control Method for Tiltrotor Aircraft/Turboshaft Engine Based on Lightweight Power Prediction Model during the Conversion Phase.” International Journal of Aeronautical and Space Sciences 27 (1): 955–72. https://doi.org/10.1007/s42405-025-00972-0
- Yu, Xin, and Yanqin Zhao. 2026. “Pilot-Assisted Conversion Flight Control for Tiltrotor Aircraft.” Journal of Aerospace Engineering 39 (6): 04026054. https://doi.org/10.1061/jaeeez.aseng-6981
- Yuan, Ye, David M. Anderson, and Douglas G. Thomson. 2021. “Use of Uncertainty Quantification to Determine the Impact of Manufacturing Error on the Handling Qualities of Tiltrotor Aircraft.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0077-2021-16815
- Yuan, Ye, Douglas G. Thomson, and David Anderson. 2020b. “Dynamic Performance Investigation for Tilt-Rotor Aircraft.” In Vertical Flight Society Forum. https://doi.org/10.4050/f-0076-2020-16303
- Yuan, Y., D. Thomson, and R. Chen. 2019. “Variable Rotor Speed Strategy for Coaxial Compound Helicopters with Lift–offset Rotors.” Aeronautical Journal 124 (1271): 96–120. https://doi.org/10.1017/aer.2019.113
- Yuk, Taeseok, Homin Kim, and Soogab Lee. 2024. “Noise Analysis of Variable-Speed Rotor Technology on the Coaxial Lift-Offset Helicopter.” INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270 (7): 4216–23. https://doi.org/10.3397/in_2024_3428
- Yuksek, Burak, and Gokhan Inalhan. 2022. “Transition Flight Control System Design for Fixed-Wing VTOL UAV: A Reinforcement Learning Approach.” In AIAA SCITECH 2022 Forum. AIAA 2022-0879. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-0879
- Zabinsky, J., and R. Burnham. 1975. “Design of a V/STOL Technology Airplane.” In Aircraft Systems and Technology Meeting. AIAA 1975-1012. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1975-1012
- Zabinsky, J., and R. Burnham. 1977. “Conceptual Design Studies of Navy Type a V/STOL Aircraft.” In V/STOL Conference. AIAA 1977-579. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1977-579
- Zabinsky, Joseph M., P. Gotlieb, and G. W. Jakubowski. 1975. “Mechanically Coupled Lift Fan Propulsion and Control for Multimission V/STOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/751100
- Zafi, Nogib Anwar, and Imon Chakraborty. 2023. “Physics-Based Lifting Surface Weight Estimation for Conceptual Design of Vertical Takeoff and Landing Aircraft.” In AIAA AVIATION 2023 Forum. AIAA 2023-3663. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2023-3663
- Zahoor, Yasir, Roeland De Breuker, and Mark Voskuijl. 2020. “Preliminary Design of a TE Morphing Surface for Rotorcraft.” In AIAA Scitech 2020 Forum. AIAA 2020-1301. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-1301
- Zahrt, John W. 1996. Strategic Implications of the Department of Defense Personnel Recovery System. Defense Technical Information Center. https://doi.org/10.21236/ada309795
- Zala, Darshankumar, and Eric Greenwood. 2026. “Parametric Investigation of Rotor-Wing Interaction Noise for Tandem Rotor-Wing Configuration.” In 32nd AIAA/CEAS Aeroacoustics Conference (2026). AIAA 2026-3248. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-3248
- Zammit, Steve, and Koos Zwaanenburg. 1989. “Real-Time Flight Simulation Support for the X-31 Aircraft Program.” In Flight Simulation Technologies Conference and Exhibit. AIAA 1989-3283. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1989-3283
- Zaretsky, Erwin V., Dennis Townsend, and John Coy. 1979. NASA Gear Research and Tts Probable Effect on Rotorcraft Transmission Design. https://doi.org/10.4050/sm_prop_1979-3559
- Zawodny, Nikolas S., Kyle A. Pascioni, and Christopher S. Thurman. 2023b. “An Overview of the Proprotor Performance Test in the 14- by 22-Foot Subsonic Tunnel.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0079-2023-18054
- Zawodny, Nikolas S., Nicole A. Pettingill, Leonard V. Lopes, and Daniel J. Ingraham. 2023a. Experimental Validation of an Acoustically and Aerodynamically Optimized UAM Proprotor Part 1: Test Setup and Results. Langley Research Center. https://ntrs.nasa.gov/citations/20220015637
- Žerajić, Vladimir, Dragan Ružić, Dragan Živanić, and Nikola Ilanković. 2026. Segment-Based Energy Balance and Propulsion Feasibility Analysis of a Light Passenger VTOL Aircraft for a Regional Mission. https://doi.org/10.46793/et26.a09z
- Zha, Gecheng, Yan Ren, JIaye Gan, and Daniel Espinal. 2019. “A High Efficiency Low Noise VTOL/ESTOL Concept Using CoFLow Jet Airfoil.” In AIAA Propulsion and Energy 2019 Forum. AIAA 2019-4467. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-4467
- Zhang, Yuwen, Vivek Ahuja, Roy Hartfield, and Dries Verstraete. 2024a. “Mid-Fidelity Numerical Calculation of XV-15 Proprotor.” In AIAA SCITECH 2024 Forum. AIAA 2024-1509. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2024-1509
- Zhang, Tao, and George N. Barakos. 2020. “Development of Simulation Tools for High Fidelity Analysis of Compound Rotorcraft.” In AIAA Scitech 2020 Forum. AIAA 2020-1258. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2020-1258
- Zhang, Jiannan, Pranav Bhardwaj, Stefan A. Raab, and Florian Holzapfel. 2019a. “Control Allocation Framework with SVD-Based Protection for a Tilt-Rotor VTOL Transition Air Vehicle.” In AIAA Aviation 2019 Forum. AIAA 2019-3265. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-3265
- Zhang, Jiannan, Pranav Bhardwaj, Stefan A. Raab, Saurabh Saboo, and Florian Holzapfel. 2018a. “Control Allocation Framework for a Tilt-Rotor Vertical Take-off and Landing Transition Aircraft Configuration.” In 2018 Applied Aerodynamics Conference. AIAA 2018-3480. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2018-3480
- Zhang, Jianhua, Hao Kang, and Edward C. Smith. 2019c. “Wing Extension Design and Tailoring for a Scaled Tiltrotor Wind Tunnel Model.” In AIAA Scitech 2019 Forum. AIAA 2019-1368. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2019-1368
- Zhang, Mengwei, Zhixiang Lin, Haiyang Huang, and Tianhong Zhang. 2019b. “Design and Verification of Model Predictive Control for Micro-Turboshaft Engine.” Advances in Mechanical Engineering 11 (12): 1687814019890198. https://doi.org/10.1177/1687814019890198
- Zhang, Shuo, Aotian Ma, Teng Zhang, Ning Ge, and Xing Huang. 2024c. “A Performance Simulation Methodology of Whole Turboshaft Engine Based on ThroughFlow Modelling.” Preprint, . https://doi.org/10.20944/preprints202401.0009.v1
- Zhang, Chi, Todd R. Quackenbush, Hossein Saberi, Chunhua Sheng, and Troy Gaffey. 2015. “Aeromechanics of the Coaxial Compound Helicopter.” In 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2015-1411. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1411
- Zhang, Geng, Ricardo Sbragio, and Nickolas Vlahopoulos. 2010. “Rotorcraft Gearbox Foundation Design by a Network of Optimizations.” In 13th AIAA/ISSMO Multidisciplinary Analysis Optimization Conference. AIAA 2010-9310. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2010-9310
- Zhang, Jianhua, and Edward C. Smith. 2015. “Advanced Composite Wings for Whirl Flutter Augmentation: Wind Tunnel Model Design.” In 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. AIAA 2015-1414. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-1414
- Zhang, Jieao, Dakun Sun, Jiahao Hu, Dengke Xu, Xin Liu, and Xiaofeng Sun. 2026c. “Resolvent Analysis of Single Rotor Wake Stability in Ground Effect.” In Topical Problems of Fluid Mechanics 2026. Institute of Thermomechanics of the Czech Academy of Sciences; CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics. https://doi.org/10.14311/tpfm.2026.039
- Zhang, Xincui, Youxu Yang, Shengjiu Chen, and Lubin Sun. 2024d. “Quick Trim Modeling for Tiltrotor Aircraft in Conversion Mode.” Journal of Physics: Conference Series 2691 (1): 012028. https://doi.org/10.1088/1742-6596/2691/1/012028
- Zhang, Saite, Yunjie Yang, Xiangyang Wang, Jihong Zhu, and Xiaojun Zhang. 2022a. “Modeling and Dynamic Analysis of a Distributed Propulsion Tilt-Rotor Aircraft.” In AIAA AVIATION 2022 Forum. AIAA 2022-3871. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2022-3871
- Zhang, Shuai, Junqi Zhang, Jiayong Zhang, and Jielong Wang. 2023c. “Static Aeroelastic Analysis of Electric Vertical Takeoff and Landing Aircraft ET480.” In Mechanisms and Machine Science. Springer International Publishing. https://doi.org/10.1007/978-3-031-42987-3_44
- Zhang, Jiechao, Siyu Zhang, Yao Zheng, and Yaolong Liu. 2025b. “Propeller–motor-Coupled Modeling and Design for Tiltrotor Aircraft.” Aircraft Engineering and Aerospace Technology 97 (3): 335–44. https://doi.org/10.1108/aeat-08-2024-0227
- Zhang, Yuan Qi, Wei Ping Zhao, and Song Xiang. 2014a. “Control Law and Simulation Analysis of Vertical Take-Off and Landing Stage of Tilt Rotor Aircraft.” Advanced materials research 1082: 521–24. https://doi.org/10.4028/www.scientific.net/amr.1082.521
- Zhang, Yuan Qi, Wei Ping Zhao, and Song Xiang. 2014b. “Non-Linear PID Controller Parameter Optimization of Vertical Take-Off and Landing Stage for Tilt Rotor Aircraft.” Advanced materials research 1082: 525–28. https://doi.org/10.4028/www.scientific.net/amr.1082.525
- Zhang, Yinong, Huimin Zhao, Dehai Zhu, Ban Wang, Jiangtao Huang, and Zhenghong Gao. 2023a. “Flight Control of a Canard Rotor/Wing VTOL Aircraft Based on Reinforcement Learning under Transition Flight Mode.” In Lecture Notes in Electrical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-99-0479-2_184
- Zhang, Yiting, Yao Zheng, and Yaolong Liu. 2026a. “Bayesian Optimization of Tiltrotor Airfoils in Cruise and Hover Conditions.” In Springer Aerospace Technology. Springer Nature Singapore. https://doi.org/10.1007/978-981-95-7840-5_27
- Zhao, Hui, Cees Bil, and Bok Yoon. 2009. “Ducted Fan VTOL UAV Simulation in Preliminary Design.” In 9th AIAA Aviation Technology, Integration, and Operations Conference (ATIO). AIAA 2009-7097. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2009-7097
- Zhao, Jinggen, J. V. R. Prasad, and David A. Peters. 2005. Effect of Rotor Wake Distortion on the Stability of Flapping Dynamics. https://doi.org/10.4050/vfs-f61-000271
- Zhao, Qiuying, and Chunhua Sheng. 2015. “Numerical Investigation and Validation for Open Rotor Hover Performance.” In 33rd AIAA Applied Aerodynamics Conference. AIAA 2015-3014. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2015-3014
- Zhao, Chong, and Ning Wang. 2016. “Tilt Rotor Aircraft Coupling Research.” In Advances in Intelligent Systems Research. Atlantis Press. https://doi.org/10.2991/mcei-16.2016.122
- Zhao, Yanqin, Xin Yu, and Ye Yuan. 2025a. “INDI-Based Control for Full Flight Modes of Tiltrotor/Tiltwing Aircraft.” In AIAA SCITECH 2025 Forum. AIAA 2025-0316. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-0316
- Zhao, Yanqin, Ye Yuan, and Renliang Chen. 2024c. “Optimal Transition of Coaxial Compound Helicopter after Total Propeller Failure.” Journal of Aerospace Engineering 37 (6): 04024086. https://doi.org/10.1061/jaeeez.aseng-5419
- Zhao, Y., Y. Yuan, R. Chen, and X. Yan. 2023d. “Propeller Control for Takeoff of a Heavily Loaded Coaxial Compound Helicopter.” Aeronautical Journal 127 (1316): 1832–49. https://doi.org/10.1017/aer.2023.7
- Zhao, Guoqing, Qijun Zhao, Peng Li, and Bo Wang. 2021. “Numerical Investigations for Passive and Active Flow Control on Tiltrotor–Wing Aerodynamic Interactions.” Journal of Aerospace Engineering 34 (6): 04021094. https://doi.org/10.1061/(asce)as.1943-5525.0001288
- Zhao, Haiyu, Li Zhou, Wenjian Deng, and Zhanxue Wang. 2024d. “Research on Aerodynamic Influence of Contra-Rotating Propfan Slipstream on Propfan Engine Nacelle Inlet.” Journal of Physics: Conference Series 2707 (1): 012097. https://doi.org/10.1088/1742-6596/2707/1/012097
- Zhao, Qingfeng, Zhou Zhou, and Rui Wang. 2024b. “Modeling and Transition Flight Control of Distributed-Propulsion-Wing Vtol Uav with Induced Wing Configuration.” Preprint, . https://doi.org/10.2139/ssrn.4862138
- Zhao, Qingfeng, Zhou Zhou, Guichen Wang, and Rui Wang. 2025c. “Transition Performance and Transition Strategy of a Distributed-Propulsion–Wing Vtol Uav with Induced Wing Configuration.” Preprint, . https://doi.org/10.2139/ssrn.5133009
- Zheng, Howard, and Inderjit Chopra. 2025. “Wind Tunnel Testing of High Advance-Ratio Compound Helicopter Designs.” In AIAA SCITECH 2025 Forum. AIAA 2025-0107. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2025-0107
- Zheng, Howard, Inderjit Chopra, and Vivek Uppoor. 2026a. “A Compound Helicopter Rotor-Propeller Phase-Locked System without a Mechanical Gearbox.” In Vertical Flight Society Annual Forum and Technology Display. https://doi.org/10.4050/f-0082-2026-0274
- Zheng, Zijie, Jiahao Dou, Yiting Zhang, Yao Zheng, and Yaolong Liu. 2026c. “Wing Aerodynamic Performance in Tilt-Duct Aircraft during Transition Phase.” In Springer Aerospace Technology. Springer Nature Singapore. https://doi.org/10.1007/978-981-95-7840-5_26
- Zheng, Yafei, Wei Qiao, and Xinlei Wang. 2025. “Aerodynamic Research on the Wing Design of a 3000 Kg Hexa Tiltrotor eVTOL.” In 2nd International Conference on Green Aviation (ICGA 2024). MDPI. https://doi.org/10.3390/engproc2024080041
- Zheng, Lixiong, Xin Wang, Zhe Chen, Qijun Zhao, and Yakui Liu. 2026b. “Prediction of Aeroelastic Responses for Tiltrotor Aircraft across a Wide Speed Range Based on DA-Diff.” Preprint, . https://doi.org/10.2139/ssrn.7351299
- Zheng, Fengying, Bowei Xiong, Jingyang Zhang, Ziyang Zhen, and Feng Wang. 2021. “Improved Neural Network Adaptive Control for Compound Helicopter with Uncertain Cross-Coupling in Multimodal Maneuver.” Preprint, Research Square. https://doi.org/10.21203/rs.3.rs-714233/v1
- Zhu, Yuanzhao, Guoping Huang, Chen Xia, and Yang Wu. 2024. “Aerodynamic Design of Fixed-Wing Vtol Aircraft Powered by Gas-Driven Fan Propulsion System.” Preprint, . https://doi.org/10.2139/ssrn.5071654
- Zhu, Hongyan, Gongnan Li, Shengwei Li, and Xinhao Yu. 2025d. “Test Research Progress of Slowed Rotor at High Advance Ratios for High Speed Rotorcrafts.” In Lecture Notes in Mechanical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-97-9768-4_35
- Zhu, Hongyan, and Qingli Wang. 2025a. “Research Progress of Passive Control Methods for the Tiltrotor Whirl Flutter.” In Lecture Notes in Mechanical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-95-3010-6_16
- Zhu, Hongyan, and Qingli Wang. 2025b. “Research Progress of the Whirl Flutter for the Tiltrotor Aircraft.” In Lecture Notes in Mechanical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-95-3010-6_15
- Zhu, Dehai, Yinong Zhang, Huimin Zhao, Ban Wang, and Zhenghong Gao. 2023. “Adaptive Fault-Tolerant Control of a Canard Rotor/Wing VTOL Aircraft.” In Lecture Notes in Electrical Engineering. Springer Nature Singapore. https://doi.org/10.1007/978-981-19-6613-2_319
- Zickwolf, Herbert, Jr., and E. Cole. 1988. “Electronic Control System for a Propfan Engine.” In 24th Joint Propulsion Conference. AIAA 1988-3174. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1988-3174
- Zimmerman, C. H. 1957. “Some General Considerations Concerning VTOL Aircraft.” SAE technical papers on CD-ROM/SAE technical paper series 1. https://doi.org/10.4271/570018
- Zimmerman, C. H. 1960. Summary of the v STOL State of the Art. NASA Langley Research Center. https://ntrs.nasa.gov/citations/19630004833
- Zimmermann, C. H. 1963. The Future of V/STOL Aircraft. NASA. https://ntrs.nasa.gov/citations/19630017254
- Zinjarde, Pranav, Yehia Amer, and Thomas Zill. 2026. “Development of a Methodology for Tilt-Rotor eVTOL Design Using an Existing Preliminary Design Tool.” In AIAA AVIATION 2026 Forum. AIAA 2026-4136. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.2026-4136
- Zosimovych, Nickolay. 2022. “Flight Transient Estimation of VTOL Aircraft with Propellers.” Advances in Aerospace Science and Technology 07 (01): 85–95. https://doi.org/10.4236/aast.2022.71005
- Zulkafli, Mohd Fadhli, Lau Wei Le, Bong Zhan Yong, Ahmad Hamdan Ariffin, Syafiqah Nur Azrie Safri, and Mohd Fauzi Yaakub. 2025. “Development of a Tiltrotor Propulsion System for Hybrid VTOL Fixed-Wing Drones.” International Journal of Integrated Engineering 17 (8). https://doi.org/10.30880/ijie.2025.17.08.014
- Набиев, Р.Н.о., and A. A.о. Aбдуллаев. 2021. “ABOUT CONVERTIPLANE TYPE UNMANNED AERIAL VEHICLES: CURRENT SITUATION AND PERSPECTIVES.” Естественные и технические науки, no. 3(154). https://doi.org/10.25633/etn.2021.03.13
- Набиев, Р.Н., А.А. Aбдуллаев, and Г.И. Гараев. 2021. “PROCESSING A CONCEPTUAL FUNCTIONAL DIAGRAM OF AN UNMANNED CONVERTIPLANE WITH A HYBRID ENERGY SOURCE.” Авиакосмическое приборостроение, no. 5. https://doi.org/10.25791/aviakosmos.5.2021.1217
- Набиев, Р.Н., А.А. Aбдуллаев, and Г.И. Гараев. 2022. “STRUCTURAL DRAFTING OF CONVERTIPLANE-TYPE UNMANNED AERIAL VEHICLE.” Авиакосмическое приборостроение, no. 6. https://doi.org/10.25791/aviakosmos.6.2022.1281
Secondary Sources
- Advancing Combat Support to Sustain Agile Combat Employment Concepts: Integrating Global, Theater, and Unit Capabilities to Improve Support to a High-End Fight. 2023. RAND Corporation. https://doi.org/10.7249/rra1001-1
- Air Force Studies Board, Division on Engineering and Physical Sciences, and National Academies of Sciences, Engineering, and Medicine. 2018. Combat Search and Rescue in Highly Contested Environments: Proceedings of a Workshop—in Brief. National Academies Press. https://doi.org/10.17226/25156
- Assessing Agile Combat Employment for the Pacific Air Forces: Estimating the Impacts of Distributed Maintenance Postures on Sortie Rate Potential. 2024. RAND Corporation. https://doi.org/10.7249/rra999-3
- Developing Combat Support Mission Ready Airmen for Agile Combat Employment. 2025. RAND Corporation. https://doi.org/10.7249/rra3169-1
- Dreier, Mark E. 2007. Introduction to Helicopter and Tiltrotor Flight Simulation. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/4.862083
- Dreier, Mark E. 2017. Introduction to Helicopter and Tiltrotor Flight Simulation, Second Edition. American Institute of Aeronautics and Astronautics, Inc. https://doi.org/10.2514/4.105135
- Drezner, Jeffrey, Parisa Roshan, and Thomas Whitmore. 2017. Enhancing Management of the Joint Future Vertical Lift Initiative. RAND Corporation. https://doi.org/10.7249/rr2010
- The Forces We Need: Building Multi-Capable Airmen to Enable Agile Combat Employment. 2023. RAND Corporation. https://doi.org/10.7249/rra1746-1
- Hirschberg, Michael J. 1997. Soviet V/STOL Aircraft: The Struggle for a Shipborne Combat Capability. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/4.868146
- Maisel, Martin D., Demo J. Giulianetti, and Daniel C. Dugan. 2000. The History of the XV-15 Tilt Rotor Research Aircraft: From Concept to Flight. NASA. https://ntrs.nasa.gov/citations/20000027499
- Mouton, Christopher, Edward Chan, Adam Grissom, John Godges, Badreddine Ahtchi, and Brian Dougherty. 2019. Personnel Recovery in the AFRICOM Area of Responsibility: Cost-Effective Options for Improvement. RAND Corporation. https://doi.org/10.7249/rr2161.1
- Weigand, M. 2022. Calculation of Weight and Center of Gravity of Rotorcraft Drive Trains in the Early Design Phases – Exploratory Study of Feasibility and Possible Approaches. VDI Verlag eBooks. https://doi.org/10.51202/9783181023891-999
- Weigand, M., and Carsten Gachot. 2022. Improved Rotorcraft Drivetrain Safety and Related Research with Special Focus on Improved Lubricants for Rotorcraft Transmissions. VDI Verlag eBooks. https://doi.org/10.51202/9783181023891-561
- Whirl Flutter of Turboprop Aircraft Structures. 2015. Elsevier. https://doi.org/10.1016/c2014-0-01800-x
- Whirl Flutter of Turboprop Aircraft Structures. 2023. Elsevier. https://doi.org/10.1016/c2021-0-02888-1
Commercial Sources
- “Aurora’s Latest X-Plane Design Speeds Ahead.” 2024. Aurora Flight Sciences, May 20. https://www.aurora.aero/2024/05/20/auroras-latest-x-plane-design-speeds-ahead/
- Bell Textron Inc. 2023. “Bell Selected for Phase 1A of DARPA Speed and Runway Independent Technologies (SPRINT) X-Plane Program.” Bell Newsroom, November 27. https://news.bellflight.com/en-US/232384-bell-selected-for-phase-1a-of-darpa-speed-and-runway-independent-technologies-sprint-x-plane-program/
- Bell Textron Inc. 2024a. “Bell Awarded Funding for Phase 1B of DARPA Speed and Runway Independent Technologies (SPRINT) X-Plane Program.” Bell Newsroom, May 28. https://news.bellflight.com/en-US/237978-bell-awarded-funding-for-phase-1b-of-darpa-speed-and-runway-independent-technologies-sprint-x-plane-program/
- Bell Textron Inc. 2024b. “Bell Awarded Funding for Phase 1B of DARPA Speed and Runway Independent Technologies (SPRINT) X-Plane Program: Bell Completes Conceptual Design Phase for X-Plane Program.” Textron Investor Relations, May 28. https://investor.textron.com/news-releases/news-details/2024/Bell-Awarded-Funding-for-Phase-1B-of-DARPA-Speed-and-Runway-Independent-Technologies-SPRINT-X-Plane-Program-05-28-2024/default.aspx
- Bell Textron Inc. 2024c. “Bell Completes Wind Tunnel Testing Efforts to Validate Revolutionary Stop/Fold Jet Transition Capability: Test Operations Seek to Validate the Stability and Control of the Stop Fold Vehicle during Jet Transition.” Bell Newsroom, December 4. https://news.bellflight.com/en-US/244996-bell-completes-wind-tunnel-testing-efforts-to-validate-revolutionary-stop-fold-jet-transition-capability
- Bell Textron Inc. 2025a. “Bell to Build X-Plane for Phase 2 of DARPA Speed and Runway Independent Technologies (SPRINT) X-Plane Program: Bell Awarded Funding for X-Plane Build Phase of SPRINT Program.” Bell Newsroom, July 9. https://news.bellflight.com/en-US/251994-bell-to-build-x-plane-for-phase-2-of-darpa-speed-and-runway-independent-technologies-sprint-x-plane-program/
- Bell Textron Inc. 2025b. “Bell to Build X-Plane for Phase 2 of DARPA Speed and Runway Independent Technologies (SPRINT) X-Plane Program: Bell Awarded Funding for X-Plane Build Phase of SPRINT Program.” Textron Investor Relations, July 9. https://investor.textron.com/news-releases/news-details/2025/Bell-to-Build-X-Plane-for-Phase-2-of-DARPA-Speed-and-Runway-Independent-Technologies-SPRINT-X-Plane-Program-07-09-2025/default.aspx
- Bell Textron Inc. 2026. “Bell Completes Critical Design Review on DARPA SPRINT X-Plane Program, Receives Official X-Plane Designation: Following the Completion of CDR, Bell Will Now Begin Building a Brand-New X-Plane with First-of-Its-Kind Stop/fold Technology.” Bell Newsroom, March 9. https://news.bellflight.com/en-US/263055-bell-completes-critical-design-review-on-darpa-sprint-x-plane-program-receives-official-x-plane-designation/
- “BQM-167A Air Force Subscale Aerial Target.” 2025. Air Force. Accessed October 24, 2026. http://web.archive.org/web/20251111202438/https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104562/bqm-167a-air-force-subscale-aerial-target/
- DARPA. 2024. “Speed and Runway Independent Technologies (SPRINT): Speed and Runway Independent Technologies.” Defense Advanced Research Projects Agency. Accessed October 24, 2026. http://web.archive.org/web/20241224212456/https://www.darpa.mil/research/programs/speed-runway-independent-technologies
- DARPA. 2025a. “Speed and Runway Independent Technologies (SPRINT): Speed and Runway Independent Technologies.” Defense Advanced Research Projects Agency. Accessed October 24, 2026. http://web.archive.org/web/20250512062509/https://www.darpa.mil/research/programs/speed-runway-independent-technologies
- DARPA. 2025b. “SPRINT: Speed and Runway Independent Technologies: Speed and Runway Independent Technologies.” Defense Advanced Research Projects Agency. Accessed October 24, 2026. http://web.archive.org/web/20250710072440/https://www.darpa.mil/research/programs/speed-runway-independent-technologies
- DARPA. 2025c. “SPRINT: Speed and Runway Independent Technologies: Speed and Runway Independent Technologies.” Defense Advanced Research Projects Agency. Accessed October 24, 2026. http://web.archive.org/web/20251212171135/https://www.darpa.mil/research/programs/speed-runway-independent-technologies
- DARPA. 2026. “artist’s concept of the SPRINT X-76 by Colie Wertz, high-resolution image, 9 March.” https://www.darpa.mil/sites/default/files/gallery/2026-03/program-sprint-x-76-high-res.jpg
- Defense Advanced Research Projects Agency. n.d. “SPRINT: Speed and Runway Independent Technologies.” Defense Advanced Research Projects Agency. Accessed October 24, 2026. https://www.darpa.mil/research/programs/speed-runway-independent-technologies
- Defense Advanced Research Projects Agency. 2026. “DARPA’s New X-76: The Speed of a Jet, the Freedom of a Helicopter: SPRINT X-76 Enters Build Phase to Demonstrate Runway-Independent, High-Speed Flight.” Defense Advanced Research Projects Agency, March 9. https://www.darpa.mil/news/2026/darpa-new-x-76-speed-of-jet-freedom-of-helicopter
- GE Aircraft Engines. 2004. “GE’s New CT7-8 Engines Certified by the FAA.” GE Aerospace News, April 22. https://www.geaerospace.com/news/press-releases/defense-engines/ges-new-ct7-8-engines-certified-faa
- General Electric. 2000. “CT7-8 Turboshaft Engine Awarded FAA Certificate.” GE Aerospace News, October 10. https://www.geaerospace.com/news/press-releases/defense-engines/ct7-8-turboshaft-engine-awarded-faa-certificate
- “A Revolutionary Solution for Contested Air Transport.” 2024. Aurora Flight Sciences, October 8. https://www.aurora.aero/2024/10/08/a-revolutionary-solution-for-contested-air-transport/
General Sources
- AviTrader. 2011. “P&WC Launches Enhanced PW308C Engine for Dassault’s Falcon 2000S.” AviTrader Aviation News, June 15. https://avitrader.com/2011/06/15/ps-falcon-2000s/
- D’Urso, Stefano. 2026. “DARPA’s High-Speed VTOL SPRINT Aircraft Receives X-76 X-Plane Designation.” The Aviationist, March 9. https://theaviationist.com/2026/03/09/darpas-sprint-x-76/
- Marrow, Michael. 2025. “DARPA Picks Bell Textron to Build Runway-Independent X-Plane: Bell Will Now Proceed in DARPA’s Speed and Runway Independent Technologies Program, Which Has Eliminated Aurora Flight Sciences from the Running.” Breaking Defense, July 9. https://breakingdefense.com/2025/07/darpa-picks-bell-textron-to-build-runway-independent-x-plane/
- Newdick, Thomas. 2026. “Bell’s X-76 Fold-Away Rotor Aircraft Is DARPA’s Newest X-Plane.” The War Zone, March 9. https://www.twz.com/air/bells-x-76-fold-away-rotor-aircraft-is-darpas-newest-x-plane
- South, Todd. 2026. “New X-Plane Promises Jet-Like Speed without the Need for Runways.” Air & Space Forces Magazine, March 10. https://www.airandspaceforces.com/new-x-plane-jet-like-speed-without-runways/
Tertiary Sources
- “List of X-Planes.” 2026. Wikipedia. Last modified June 16, at 19:44 (UTC). https://en.wikipedia.org/w/index.php?title=List_of_X-planes&oldid=1359712029
- Parsch, Andreas. 2002. “DOD 4120.15-L: Addendum: MDS Designators Allocated after 19 August 1998 (until November 2025).” Designations of U.S. Military Aircraft. https://www.designation-systems.net/usmilav/412015-L(addendum).html
- Parsch. 2025. “DOD 4120.15-L: Addendum: MDS Designators Allocated after 19 August 1998 (until November 2025).” Designation-Systems.Net. Accessed October 24, 2026. http://web.archive.org/web/20251210111623/https://www.designation-systems.net/usmilav/412015-L(addendum).html
- Parsch, Andreas. 2026a. “DOD 4120.15-L: Addendum: MDS Designators Allocated after 19 August 1998 (until November 2025).” Designation-Systems.Net. Accessed October 24, 2026. http://web.archive.org/web/20260115211518/https://www.designation-systems.net/usmilav/412015-L(addendum).html
- Parsch, Andreas. 2026b. “DOD 4120.15-L: Addendum: MDS Designators Allocated after 19 August 1998 (until November 2025).” Designation-Systems.Net. Accessed October 24, 2026. http://web.archive.org/web/20260201194217/https://www.designation-systems.net/usmilav/412015-L(addendum).html
- U.S. Department of the Air Force, U.S. Department of the Army, and U.S. Department of the Navy. 2020. Designating and Naming Defense Military Aerospace Vehicles. DAFI 16-401, AR 70-50, NAVAIRINST 13100.16. U.S. Department of the Air Force. https://www.designation-systems.net/usmilav/afi16-401.pdf
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- Sechter, Brendan. 2025. “X-Planes: Boeing X-48.” Brendan A R Sechter’s Development Blog, November 23. https://sgeos.github.io/aerospace/history/engineering/2025/11/23/x_planes_boeing_x48.html
- Sechter, Brendan. 2025. “X-Planes: Piasecki X-49 SpeedHawk.” Brendan A R Sechter’s Development Blog, November 24. https://sgeos.github.io/aerospace/history/engineering/2025/11/24/x_planes_piasecki_x49.html
- Sechter, Brendan. 2025. “X-Planes: Boeing X-50 Dragonfly.” Brendan A R Sechter’s Development Blog, November 25. https://sgeos.github.io/aerospace/history/engineering/2025/11/25/x_planes_boeing_x50.html
- Sechter, Brendan. 2025. “X-Planes: Boeing X-51 Waverider.” Brendan A R Sechter’s Development Blog, November 26. https://sgeos.github.io/aerospace/history/engineering/2025/11/26/x_planes_boeing_x51.html
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- Sechter, Brendan. 2025. “X-Planes: Boeing X-53 Active Aeroelastic Wing.” Brendan A R Sechter’s Development Blog, November 28. https://sgeos.github.io/aerospace/history/engineering/2025/11/28/x_planes_boeing_x53_active_aeroelastic_wing.html
- Sechter, Brendan. 2025. “X-Planes: Gulfstream X-54.” Brendan A R Sechter’s Development Blog, November 29. https://sgeos.github.io/aerospace/history/engineering/2025/11/29/x_planes_gulfstream_x54.html
- Sechter, Brendan. 2025. “X-Planes: Lockheed Martin X-55 ACCA.” Brendan A R Sechter’s Development Blog, November 30. https://sgeos.github.io/aerospace/history/engineering/2025/11/30/x_planes_lockheed_martin_x55_acca.html
- Sechter, Brendan. 2025. “X-Planes: Lockheed Martin X-56.” Brendan A R Sechter’s Development Blog, December 1. https://sgeos.github.io/aerospace/history/engineering/2025/12/01/x_planes_lockheed_martin_x56.html
- Sechter, Brendan. 2025. “X-Planes: ESAero X-57 Maxwell.” Brendan A R Sechter’s Development Blog, December 2. https://sgeos.github.io/aerospace/history/engineering/2025/12/02/x_planes_esaero_x57_maxwell.html
- Sechter, Brendan. 2025. “X-Planes: X-58, the Slot Taken by XQ-58.” Brendan A R Sechter’s Development Blog, December 3. https://sgeos.github.io/aerospace/history/engineering/2025/12/03/x_planes_x58_slot_taken_by_xq58.html
- Sechter, Brendan. 2025. “X-Planes: Lockheed Martin X-59 Quesst.” Brendan A R Sechter’s Development Blog, December 4. https://sgeos.github.io/aerospace/history/engineering/2025/12/04/x_planes_lockheed_martin_x59_quesst.html
- Sechter, Brendan. 2025. “X-Planes: Generation Orbit X-60.” Brendan A R Sechter’s Development Blog, December 5. https://sgeos.github.io/aerospace/history/engineering/2025/12/05/x_planes_generation_orbit_x60.html
- Sechter, Brendan. 2025. “X-Planes: Dynetics X-61 Gremlins.” Brendan A R Sechter’s Development Blog, December 6. https://sgeos.github.io/aerospace/history/engineering/2025/12/06/x_planes_dynetics_x61_gremlins.html
- Sechter, Brendan. 2025. “X-Planes: Lockheed Martin X-62 VISTA.” Brendan A R Sechter’s Development Blog, December 7. https://sgeos.github.io/aerospace/history/engineering/2025/12/07/x_planes_lockheed_martin_x62_vista.html
- Sechter, Brendan. 2025. “X-Planes: ABL Space Systems X-63.” Brendan A R Sechter’s Development Blog, December 8. https://sgeos.github.io/aerospace/history/engineering/2025/12/08/x_planes_abl_space_systems_x63.html
- Sechter, Brendan. 2025. “X-Planes: Invocon X-64.” Brendan A R Sechter’s Development Blog, December 9. https://sgeos.github.io/aerospace/history/engineering/2025/12/09/x_planes_invocon_x64.html
- Sechter, Brendan. 2025. “X-Planes: Aurora Flight Sciences X-65 CRANE.” Brendan A R Sechter’s Development Blog, December 10. https://sgeos.github.io/aerospace/history/engineering/2025/12/10/x_planes_aurora_x65_crane.html
- Sechter, Brendan. 2025. “X-Planes: Boeing X-66.” Brendan A R Sechter’s Development Blog, December 11. https://sgeos.github.io/aerospace/history/engineering/2025/12/11/x_planes_boeing_x66.html
- Sechter, Brendan. 2025. “X-Planes: X-67, the Slot Taken by XQ-67A.” Brendan A R Sechter’s Development Blog, December 12. https://sgeos.github.io/aerospace/history/engineering/2025/12/12/x_planes_x67_slot_taken_by_xq67.html
- Sechter, Brendan. 2025. “X-Planes: General Atomics X-68 LongShot.” Brendan A R Sechter’s Development Blog, December 13. https://sgeos.github.io/aerospace/history/engineering/2025/12/13/x_planes_general_atomics_x68_longshot.html
- Sechter, Brendan. 2025. “X-Planes: X-69 through X-75, the Leapfrogged Block.” Brendan A R Sechter’s Development Blog, December 14. https://sgeos.github.io/aerospace/history/engineering/2025/12/14/x_planes_x69_through_x75_leapfrogged_block.html