X-Planes: Hiller X-18

Oct 24, 2025 • 1257 min read • 276709 words • Comments

Filed under: aerospace, history, engineering

The Hiller X-18 tilted its entire wing to take off vertically. The tilting is the easy part. The hard part is that a wing pointed at the sky is a wing pointed away from the oncoming air, and a wing at ninety degrees to the flow is stalled. The configuration works only where the propeller slipstream keeps the flow attached, and the fraction of the wing that sits in the slipstream is fixed at design time. This article is the nineteenth 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, and the X-17.

The series has met the vertical take-off problem twice already, at the X-13 and the X-14. Both solved it by pointing a jet downward. The X-18 is the first attempt in this series to solve it with a wing, a different problem with a different failure mode, and that failure mode arrived.

The standard inventory entry remains Jenkins Landis and Miller 2003 American X-Vehicles, An Inventory X-1 to X-50, which the National Aeronautics and Space Administration publishes as Monographs in Aerospace History No. 31, and the vehicle compilation is Miller 2001 The X-Planes, X-1 to X-45. The tilt-wing design literature is McCormick and Mallen 1956 and its later textbook form McCormick 1967 Aerodynamics of V/STOL Flight.

The Research Question

The question is not whether a wing can be tilted. It obviously can. The question is whether a continuous, controllable path exists from hover to wing-borne flight, and for a tilt-wing that path is constrained by something the pilot cannot adjust.

The Keystone Is Slipstream Immersion

The keystone is the fraction of the wing that sits inside the propeller slipstream.

At zero forward speed the aircraft is held up by propeller thrust, and the wing does nothing except get in the way. At cruise the wing does everything. In between, the wing must take over progressively, and to do that it must be generating lift at wing tilt angles far beyond any ordinary stall angle.

Only the slipstream permits that. Air leaving a propeller disc at eighty metres per second does not care that the aircraft is stationary, and a wing immersed in it is flying regardless. A wing outside it is not.

So the configuration divides the wing into two parts that behave completely differently throughout the conversion, and the division is set by propeller diameter against span, which is frozen when the aircraft is drawn.

Why This Was the Binding Unknown in 1957

The alternatives were understood and each had a known defect. A helicopter has a low disc loading and cannot cruise efficiently. A tail-sitter, as the Convair XFY-1 showed, asks the pilot to land looking over his shoulder. A deflected-jet aircraft, as the X-14 showed, spends an enormous fraction of its thrust simply on being controllable.

A tilt-wing promised a genuine transport aircraft, one that hovers like a helicopter and then cruises like an aeroplane with the whole wing working. Design studies of the period compare the options directly, in Irvin and Swan 1956 and Boeing Co Morton Pa Vertol Div 1956a, and the tilt-wing’s commercial case is argued in Mazzitelli 1957.

Design requirements for the configuration were being written at the same time, in Stuart 1956, Dallas and Irvin 1956, and the successive treatments of McCormick and Mallen 1957. Earlier convertiplane flight experience is recorded in Marks 1956 and the critical advance ratio problem in Doetsch and Mark 1953.

The tilt-wing and its relatives were studied continuously from the mid-1950s to the present, across McCormick 1956a, Feldman 1956, Stepniewski 1957, Stuart 1957, Ward 1960, Quigley and Koenig 1960, Kuhn and Grunwald 1960, Tosti 1961, O’Rourke and Rutherford 1991, Totah 1992, Rutherford and Bass 1992, Sullivan 1993, Harris 2003, Armutcuoglu et al. 2004, de Madrid et al. 2007, Holsten et al. 2011, Cui et al. 2019, Rohr et al. 2019, Binz et al. 2019, Geuther et al. 2020.

What nobody had in 1957 was flight evidence that the conversion was flyable at full scale, and the smaller Vertol VZ-2 made its first full transition only in July 1958. The X-18 was built to obtain that evidence in a large aircraft, and it failed to obtain it. The inventory records that it was conceived to assess the feasibility and practicality of a large tilt-wing aircraft.

Programme Origin

The X-18 is the most conspicuously improvised aircraft in this series. Hiller built it from parts that already existed. The fuselage came from a Chase YC-122C Avitruc assault transport. The turboprops came from two cancelled tail-sitting fighter programmes, the Convair XFY-1 Pogo and the Lockheed XFV-1, which had used the same Allison T40 driving contra-rotating propellers. A Westinghouse J34 turbojet went in the tail. The National Aeronautics and Space Administration’s inventory records the same YC-122C fuselage and two turboprop engines surplused from the Navy’s cancelled vertical take-off fighter programme.

The X-18 was thus a research aircraft assembled from the wreckage of the previous generation of answers to the same question, and the point matters because the components carried their assumptions with them. The engines were chosen for a tail-sitter, not for a tilt-wing.

The programme began as a company proposal and became an Air Force contract. The official history of the Air Force’s 16th Special Operations Wing records that Hiller proposed a tilt-wing aircraft to both the Army and the Air Force early in 1954 as an alternative to the helicopter, that design work began in 1955, and that the Air Force funded and contracted for the aircraft, which was designated the X-18 in October 1957 and unveiled on 8 December 1958. The inventory lists the Air Force and the Navy as its sponsors.

Hiller’s own engineering record exists, on paper only. The company’s reports on the aircraft, its Model 1051, are catalogued in the Bernard Lindenbaum Vertical Flight Research Collection at Wright State University, and every one of them that names a contract names the same Air Force contract. They include a preliminary design study summary of October 1956, an estimate of flight-test performance of May 1957, an analysis of the variation of pitching moment in transition flight of May 1958, force tests and remote-controlled free-flight tests of a one-eighth scale model in October 1958, an analysis of the thrust available from the J34-WE-36 pitch control engine of October 1958, and a simulation of the X-18 in hover for Edwards Air Force Base of February 1959. None of the catalogued items reports flight results, and none is digitised, so the programme’s design intentions are on record and its flight measurements are not.

The Vehicle

The compiled specification in the encyclopaedia entry, which cites Jane’s All the World’s Aircraft and Miller, gives a span of 48 feet, a wing area of 528 square feet, a length of 63 feet, an empty weight of 27,052 pounds, a maximum take-off weight of 33,000 pounds, and two Allison T40-A-14 turboprops of 5,850 equivalent horsepower each. The two contra-rotating propellers are 16 feet in diameter in its text and 16 feet 1 inch in its table, and this article uses 16 feet. The Air Force history calls the aircraft sixteen and a half tons, which in short tons of 2,000 pounds is

\[W = 16.5 \times 2{,}000 = 33{,}000\ \text{lb} \tag{1}\]

the same maximum weight from an independent official source.

The sources disagree about the first flight by four days. The inventory gives a first flight on 20 November 1959, and the Air Force history gives 24 November 1959 at Edwards Air Force Base. The encyclopaedia entry reconciles them as a first hop on 20 November and a first full flight on 24 November, after preliminary testing at Moffett Field. The inventory records 20 flights in all, the last in July 1961, with a fastest flight of 253 miles an hour and a highest of 35,300 feet.

Before relying on the published figures, it is prudent to confirm that they are internally consistent, and they are. Aspect ratio from span and area is

\[A = \frac{b^{2}}{S} = \frac{48^{2}}{528} = 4.364 \tag{2}\]

against a quoted 4.36, and the wing loading at maximum weight is

\[\frac{W}{S} = \frac{33{,}000}{528} = 62.50\ \text{lb/ft}^{2} \tag{3}\]

Sizing From First Principles

How Much of the Wing Is Immersed

The raw geometric ratio is two propeller diameters against the span,

\[f_{\text{raw}} = \frac{n D_p}{b} = \frac{2 \times 16}{48} = 0.667 \tag{4}\]

so two thirds of the span sits behind a propeller. That figure is optimistic, because a slipstream contracts. Momentum theory gives the fully developed slipstream area as half the disc area, so the diameter contracts by the square root of two,

\[D_{\text{slip}} = \frac{D_p}{\sqrt{2}} = \frac{4.877}{1.414} = 3.448\ \text{m} = 11.31\ \text{ft} \tag{5}\]

which would immerse only 47.1 percent of the span. The wing sits close behind the disc, where contraction is partial, so the true figure lies between.

Station	Diameter factor	Immersed span
At the disc	1.000	66.7 percent
Just behind the disc	0.850	56.7 percent
Fully developed	0.707	47.1 percent

Taking a representative value, about 57 percent of the span is immersed and about 43 percent is not. The rest of the article follows from that number.

Is the Un-Immersed Wing Actually Stalled

The outer wing meets the freestream at an angle of attack equal to the wing tilt plus the fuselage attitude. With the fuselage level,

\[\alpha_{\text{free}} = i_w \tag{6}\]

and taking a stall angle of 15 degrees, which is an assumption and a generous one for a thick unswept wing, the outer panel is stalled for any tilt above 15 degrees. A conversion runs from zero tilt to about ninety, so the stalled fraction of the conversion is

\[\frac{90 - 15}{90} = 0.833 \tag{7}\]

Maximum lift and stalling behaviour of full-scale wings had been catalogued since Sweberg and Dingeldein 1945, and the leading-edge stall mechanism at high incidence in Black 1956, so the designers were not working blind about the stall itself. They were working blind about what a propeller does to it.

Stall, maximum lift and the installation of propellers on wings were studied extensively over the same decades, in Sharp 1950, Hickey and Aoyagi 1960, Feistel et al. 1978, Nelson and Mouch 1978, Wang 1979, Vincent et al. 1979, Smith and Levin 1981, Bennett et al. 1983, Anderson and Cho 1984, Bartlett 1985, Hoadley and Pederson 2001, Catalano 2004, Delamore-Sutcliffe and Greenwell 2006, Uhlig and Selig 2008, Fan et al. 2019, Hariyadi et al. 2022, Xiao et al. 2022, Goharshadi and Mirzaei 2022.

The outer wing is stalled for five sixths of the conversion. The cause is geometric, and no amount of section design removes it, because the wing is pointed away from the oncoming air by construction. The stall behaviour of exactly this configuration was measured, in Giulianetti and Weiberg 1964, and the prediction of span loading on a propeller-blown wing up to stall is the subject of McVeigh et al. 1975.

What the Slipstream Buys

Momentum theory for an actuator disc at static thrust gives the induced velocity at the disc and the fully developed slipstream behind it,

\[v_i = \sqrt{\frac{T}{2 \rho A}}, \qquad v_s = 2 v_i \tag{8}\]

At maximum weight each propeller carries half of it,

\[T = \frac{33{,}000}{2} = 16{,}500\ \text{lbf} = 73.4\ \text{kN} \tag{9}\]

over a disc area of 18.68 square metres, for a disc loading of

\[\frac{T}{A} = \frac{73{,}400}{18.68} = 3{,}929\ \text{N/m}^{2} = 82.1\ \text{lb/ft}^{2} \tag{10}\]

and gives

\[v_i = \sqrt{\frac{73{,}400}{2 \times 1.225 \times 18.68}} = 40.05\ \text{m/s} \tag{11}\]

with a fully developed slipstream at 80.09 metres per second. Taking an assumed part-developed value of $1.5 v_i$ at the wing, the dynamic pressure over the immersed panel at zero forward speed is

\[q_{\text{slip}} = \tfrac{1}{2} \rho (1.5 v_i)^{2} = \tfrac{1}{2} \times 1.225 \times 60.07^{2} = 2{,}210\ \text{Pa} \tag{12}\]

which corresponds to an equivalent airspeed of

\[V_{\text{eq}} = \sqrt{\frac{2 q_{\text{slip}}}{\rho}} = 60.1\ \text{m/s} = 117\ \text{kt} \tag{13}\]

That is the static case. With forward speed the induced velocity solves

\[v_i = \frac{T}{2 \rho A \sqrt{V^{2} + v_i^{2}}} \tag{14}\]

which reduces to the expression above at zero speed. The induced velocity falls as the aircraft accelerates, from 40.05 metres per second at rest to 24.71 at sixty, while the freestream rises faster, so the total dynamic pressure over the immersed panel climbs from 2,210 to 5,772 pascals through the conversion.

The handover is helped by the physics, not fought by it. The immersed panel gets a more energetic flow at every stage of the conversion, and that rising flow goes a long way toward explaining why the configuration is viable.

The immersed wing is flying at about 117 knots while the aircraft is standing still. The configuration depends on that equivalence, and without it a tilt-wing could not work. The immersed wing never stops flying. The un-immersed wing never starts.

The Relation That Makes the Configuration Work

The article has so far asserted that the slipstream keeps the immersed panel flying without giving the relation that makes it true. That relation is the local angle of attack, the most important equation here.

The propeller axis lies along the wing chord, so the slipstream adds velocity along the chord while the freestream arrives at the wing tilt angle. Resolving the two,

\[\alpha_{\text{local}} = \arctan\left(\frac{V \sin i_w}{V \cos i_w + v_s}\right) \tag{15}\]

For the un-immersed panel $v_s = 0$ and this collapses to $\alpha = i_w$. The claim made earlier is therefore a limiting case of the relation, no longer a separate assertion. For the immersed panel it does something remarkable.

Speed	15° tilt	30°	45°	60°	75°	90°
0 m/s	0.0	0.0	0.0	0.0	0.0	0.0
10 m/s	2.1	4.2	6.0	7.6	8.8	9.5
20 m/s	3.7	7.4	10.8	13.9	16.5	18.4
30 m/s	5.0	9.9	14.6	19.1	23.1	26.5
60 m/s	7.5	15.0	22.5	30.0	37.5	45.0

The interference this relation idealises is the central aerodynamic subject of the configuration and has a long literature, in Thoren and Johnson 1940, Stiesz 1940, Brenckmann 1958, Kuhn 1959, Vidal et al. 1960, Grunwald 1961a, Weiberg and Holzhauser 1961, Kuhn and Grunwald 1961, Rizk 1980b, Katz et al. 1980, Welge et al. 1981, Moens and Gardarein 2001, Renooij and Slingerland 2004, Wang et al. 2019e, Wang et al. 2019a, Mikhalyov et al. 2019, Xue and Zhou 2020b.

At zero forward speed the immersed wing is at exactly zero angle of attack, at any tilt whatever. The only flow it sees comes straight down its chord. It is not stalled, not marginal, and needs no high-lift device to be unstalled. The un-immersed panel meanwhile sits at the full tilt angle at every speed in the table.

Where the Immersed Panel Finally Does Stall

Setting $\alpha_{\text{local}}$ equal to the stall angle and solving for tilt gives the limit.

Speed	Maximum tilt before the immersed panel stalls
10 m/s	90.0°
20 m/s	66.0°
30 m/s	46.2°
40 m/s	37.9°
60 m/s	30.0°

The tolerable tilt falls as speed rises, the favourable direction, because a faster aircraft needs less tilt anyway. The two curves are moving the same way, and whether a corridor exists depends on whether the required tilt falls faster than the allowed one.

What the Immersed Wing Can Carry

With 57 percent of the span immersed, the immersed area is 27.80 square metres against 21.26 outside.

Lift coefficient	Immersed lift	Fraction of maximum weight
0.8	11,049 lbf	33.5 percent
1.0	13,811 lbf	41.9 percent
1.4	19,336 lbf	58.6 percent

The wing alone cannot hover the aircraft, as expected, because in hover the propellers carry the weight directly as thrust. The relevant test is continuity of the handover, and lifting the aircraft in hover is no part of it, and the table shows there is a substantial contribution available from the immersed panel throughout.

The Conversion Corridor Exists

Level flight during conversion requires

\[T \sin i_w + L = W, \qquad T \cos i_w = D \tag{16}\]

with the lift coming from the immersed panel at slipstream dynamic pressure and the rest of the wing at freestream dynamic pressure,

\[L = q_{\text{slip}} S_{\text{imm}} C_{L,\text{imm}} + q_\infty (S - S_{\text{imm}}) C_{L,\text{free}} \tag{17}\]

Solving for the tilt that balances weight at each speed, and setting it beside the tilt the immersed panel will tolerate, gives the corridor.

Speed	Tilt required	Tilt allowed	Margin
10 m/s	52.0°	90.0°	38.0°
20 m/s	37.4°	66.0°	28.6°
30 m/s	26.7°	46.2°	19.6°
40 m/s	23.5°	37.9°	14.4°
50 m/s	20.5°	33.1°	12.6°
60 m/s	17.0°	30.0°	13.0°

The transition problem, and the control, handling and powerplant questions around it, occupied the powered-lift community for decades, across Boeing Co Morton Pa Vertol Div 1956b, Smith 1958a, Loewy and Yntema 1958, Baxter and Finvold 1958, Mallen and Dancik 1959, NASA Conference on V/STOL 1960, Conference on V/Stol Aircraft 1960, Conference on V/Stol Aircraft a Co, Tapscott 1960b, Tapscott 1960a, Anderson 1960a, Stapleford 1980, Roberts et al. 1981, Fluk 1981, Hill 1981, Verma and Junkins 2000, Chana 2002, Ng and Datta 2019, Wang et al. 2019f, Wang et al. 2019g.

A corridor exists at every speed. The point needs stating plainly, because the argument so far has emphasised what is stalled and could leave the impression that the configuration is marginal. It is not. The tilt-wing works, with a margin of between twelve and thirty-eight degrees of tilt throughout. The X-18 was under-equipped for the configuration, not attempting an impossible one.

The margin is narrowest in the middle of the conversion, around forty to fifty metres per second, where the aircraft has neither the slipstream authority of low speed nor the freestream dynamic pressure of high speed.

Descent Closes the Corridor

The corridor above is for level flight. Descending at rate $w$ adds to the angle of attack, because the freestream arrives from below,

\[\alpha_{\text{eff}} = \alpha_{\text{local}} + \arctan\frac{w}{V} \tag{18}\]

so a tilt-wing can be stalled by its own rate of descent at constant tilt and constant speed. Computing the descent rate that consumes the whole margin at the required tilt,

Speed	Descent that closes the corridor
10 m/s	1.44 m/s, or 284 ft/min
20 m/s	2.07 m/s, or 408 ft/min
30 m/s	3.26 m/s, or 641 ft/min
50 m/s	4.98 m/s, or 980 ft/min
60 m/s	6.85 m/s, or 1,349 ft/min

The observation is not novel, and the literature confirms it directly. The descent capability of two-propeller tilt-wing configurations, the X-18’s exact arrangement, was measured and reported in Hassell and Kirby 1966. The wider subject, including the vortex ring state that a lifting rotor meets in descent and its modern computational treatment, runs through Hassell and Kirby 1966, Johnson 1977, Lee 1985, Inoue et al. 1997, Johnson 2004, Johnson 2005, Prasad and Chen 2006, Young 2010, Stalewski and Surmacz 2019, Stalewski and Surmacz 2020, Makeev et al. 2021c, Makeev et al. 2021b.

Two hundred and eighty-four feet per minute at the slow end is a gentle descent by any normal standard, and it exhausts the margin. Here lies the tilt-wing descent problem. It is why these aircraft carried restricted descent envelopes such as the rate-of-descent limitations in Pegg’s VZ-2 flight tests, and it explains why the approach, not the take-off, was the difficult half of the flight.

The period record agrees, and finds the table optimistic. Kirby’s paper in the 1960 conference on vertical and short take-off aircraft, Conference on V/Stol Aircraft 1960, Conference on V/Stol Aircraft a Co, resolves the freestream and the slipstream increment into the wing’s angle of attack as above, notes that the portions of the wing outside the slipstream meet a very high angle of attack, and adds that in descent the reduced power also lowers the slipstream increment, so the angle of attack rises from both causes. The relation above holds the slipstream fixed, so the descent rates in the table are upper bounds. In the same compilation Drinkwater reports that pilots of the tilt-wing and deflected-slipstream test beds set their steep-approach limits by the rate of descent appropriate to the conversion angle, and that a pilot who did not know those limits could turn a steep descent into a series of stall recoveries.

Pegg’s summary of the VZ-2 flight tests measured this on a tilt-wing that flew the full conversion. Its most critical region was decelerating conversion and descent, where wing stall and separation produced buffeting, erratic motion and general difficulty in handling. In level flight with the wing raised to 20 degrees, abrupt flow breakdown set in near 60 knots as speed fell from 75. A leading-edge droop on the outboard wing added about 600 feet per minute of descent capability near 60 knots and an inboard droop about another 500,

\[\Delta \dot{h} = 600 + 500 = 1{,}100\ \text{ft/min} \tag{19}\]

which is the additional descent capability Pegg’s conclusions give for the full-span droop. The fix was a stall delay on the wing, and no source cited here records such a device on the X-18.

Disc Loading as the Cost of the Configuration

\[\frac{W}{n A} = \frac{146{,}800}{2 \times 18.68} = 3{,}929\ \text{N/m}^{2} = 82.1\ \text{lb/ft}^{2} \tag{20}\]

against roughly 11.7 pounds per square foot for a single 60 foot helicopter rotor at the same weight. The tilt-wing carries seven times the disc loading of a helicopter, the price of having propellers small enough to fit on a wing. Hover power follows from the same momentum theory,

\[P = n\, T \sqrt{\frac{T}{2 \rho A}} \tag{21}\]

which evaluates to 5,879 kilowatts, or 7,883 ideal shaft horsepower. Against an installed power of

\[P_{\text{shaft}} = 2 \times 5{,}850 = 11{,}700\ \text{hp} \tag{22}\]

from the two T40 engines of the compiled specification, that implies a figure of merit of

\[\text{FM} = \frac{P_{\text{ideal}}}{P_{\text{shaft}}} = \frac{7{,}883}{11{,}700} = 0.674 \tag{23}\]

an entirely ordinary propeller figure of merit, and the strongest available check that the published weight, propeller diameter, and engine power describe one consistent aircraft.

Dependent Systems

The Pitch Jet Repeats the X-13 and X-14 Answer

The X-18 carried a turbojet in the tail whose exhaust was deflected up or down purely for pitch control at low speed, and Hiller’s October 1958 analysis of the thrust available from that J34-WE-36 installation is among the reports in the Lindenbaum collection. The reason is the relation the previous two vertical take-off articles both used. Aerodynamic control scales with dynamic pressure and vanishes at zero speed, while thrust does not,

\[M_{\text{aero}} = q S \bar{c}\, C_{m\delta_e} \delta_e \propto V^{2}, \qquad M_{\text{jet}} = T_{\text{jet}}\, l \tag{24}\]

No source gives the jet’s arm or its deflected thrust, so both are assumed here. Taking the arm as 0.45 of the 63 foot length and a deflected thrust of a thousand pounds force, under a third of the 3,400 pounds the encyclopaedia entry gives for the J34,

\[l = 0.45 \times 63 \times 0.3048 = 8.64\ \text{m}, \qquad M_{\text{jet}} = 4{,}448 \times 8.64 = 38.4\ \text{kN m} \tag{25}\]

with an assumed elevator effectiveness of 1.2 per radian at an assumed 20 degrees of deflection. Setting the two equal and solving for speed gives the crossover at which the elevator takes over,

\[V_{\text{cross}} = \sqrt{\frac{2 M_{\text{jet}}}{\rho S \bar{c}\, C_{m\delta_e} \delta_e}} = 30.2\ \text{m/s} = 58.6\ \text{kt} \tag{26}\]

The control-power requirement that makes such a system necessary was being established across the same years, in Reeder 1958, Carlson 1958, Slaughter 1958, and Crim 1959, with the underlying hovering-stability question in McCaskill 1953 and the variable-stability technique that produced much of it in Harper and Robert P. 1955.

The control-power and handling-qualities literature that establishes how much authority is enough includes Gray et al. 1953, Daughaday and Duwaldt 1955, Anderson 1960b, Bull 1960, Newsom 1962a, Newsom 1962b, Van Dam et al. 1980, Hess 1981, Goldstein 1982, Helicopter Handling Qualities 1982, Corless and Blanken 1983, Harris et al. 2000, Teofilatto 2001, Srinathkumar 2011, Baughman and Longeauay 2015, Portapas and Cooke 2020, Humphreys-Jennings et al. 2020, Campos and Marques 2021, Guo 2021.

Below about sixty knots the jet is doing the work. The X-18 is the third vertical take-off aircraft in this series, after the X-13 and the X-14, to carry a separate thrust-based control system for this reason, and the pattern is the clearest recurring result the series has produced.

The Engines and the Missing Cross-Shaft

The encyclopaedia entry states that the two turboprops were not cross-linked, and the Air Force history confirms it in contrasting the XC-142A, whose engines were linked so that a single engine could turn all four propellers and the tail rotor. The failure of one X-18 engine therefore removed that propeller’s thrust entirely. In hover that is half the lift, applied at the propeller’s lateral station. Taking the propeller at an assumed quarter span of the 48 foot wing, $y = 12 \times 0.3048 = 3.658$ metres, and

\[M_{\text{roll}} = T y = 73.40 \times 3.658 = 268\ \text{kN m} \tag{27}\]

Against that, roll control comes from the ailerons, whose effectiveness scales with dynamic pressure,

\[L_{\delta_a} = q S b\, C_{l\delta_a} \delta_a \tag{28}\]

evaluated with an assumed $C_{l\delta_a}$ of 0.08 per radian and an assumed 20 degrees of deflection.

Freestream	Aileron moment	Fraction of the upset
0 m/s	0.0 kN m	0.00 percent
10 m/s	1.2 kN m	0.46 percent
20 m/s	4.9 kN m	1.83 percent
30 m/s	11.0 kN m	4.12 percent

The ailerons supply under one percent of what is needed in hover and still only four percent at thirty metres per second. The statement in the encyclopaedia entry that the failure of one engine meant the airplane would crash is therefore not a caution. It is arithmetic, and cross-shafting is not a refinement but the only available fix. The same entry records that thrust was controlled through throttle changes, which were too slow for acceptable height and roll control, and that the programme’s two lessons were cross-shafting between the engines and direct propeller pitch control for height and lateral control in hover. The problem was recognised in the period literature for turboprops generally, in Kirchner 1955, and engine failure, drive systems and the interconnecting shafting that mitigates them are treated across Holzhauser et al. 1964, Overfield and Crawford 1967, Bucsek 1974, Johnson 1975, Stewart 1987, Arnold et al. 1987, Carlson et al. 1999, Schroijen and Slingerland 2007, Wandini et al. 2016, Harish et al. 2018, Casadei et al. 2019, Leelaburanathanakul et al. 2021, and Hoogreef and Soikkeli 2022. The powerplant itself, including the propeller pitch control that one account says failed on the final flight, appears in Zucrow 1949, Mock 1951, Rice 1955, Hooker 1956, Rasmussen 1960, Study of Turboprop Systems 1978, Hirschkron et al. 1979b, Hirschkron et al. 1979a, Banach and Reynolds 1981, Wynn 1982, Stoten 1983, Scott 2009.

The Wing and Its Devices

A tilt-wing’s outer panel is stalled through most of the conversion, so any device that delays stall is valuable. The period answer was boundary layer control by blowing, investigated over flaps and combinations in Spreemann and Kuhn 1956 and Spreemann 1958, with mechanical sliding and slotted flaps and a slat in Kuhn 1957, and large-chord slotted arrangements in Kirby 1956a.

Free-floating and stall-flutter behaviour of tilt-wing models was investigated later, in Ormiston 1972.

High-lift and boundary-layer-control devices are the standard remedy, investigated on tilting wings, on STOL and jet transport configurations and on other wings, in Passamanick 1948, Cook et al. 1958, Kelly et al. 1958, Aoyagi and Hickey 1959, Maki 1959, Aoyagi and Hickey 1963, Fink 1967, Phelps et al. 1973, Quigley et al. 1974, Caruso et al. 1988, Lee and Roberts 1990, Kondor et al. 2003, Beck et al. 2014. The effectiveness of blowing is measured by a momentum coefficient,

\[C_\mu = \frac{\dot{m} V_j}{q_\infty S} \tag{29}\]

and at the low freestream dynamic pressures of a conversion even a modest jet is a large coefficient, reaching 0.125 at twenty metres per second for an illustrative fifteen hundred newtons of jet momentum.

No source cited here records any of that on the X-18. As the encyclopaedia entry describes it, the aircraft had a tilting wing, two turboprops and a pitch control jet, the minimum experiment and not the best aircraft.

The Propellers

Propeller behaviour at zero and low forward speed forms a separate subject, and static thrust in particular is not simply the cruise propeller evaluated at zero advance ratio, as Webb and Willer 1952 sets out, with later estimation methods in Brusse and Cronk 1965. Propeller design for this class of aircraft is treated in Biermann 1954 and the ducted alternative in Zabinsky and Laszewski 1956. The propeller also has to work across an enormous range of advance ratio,

\[J = \frac{V}{n D} \tag{30}\]

which is zero in hover and of order one in cruise. At an assumed propeller speed of 1,100 revolutions per minute on a 4.877 metre diameter, $J$ runs from 0 to 1.12 between hover and 100 metres per second, so the same blades meet the flow at completely different angles at the two ends of the conversion. Propeller behaviour across that range, including static thrust, blade design and contra-rotating arrangements, is treated in Gray and Biermann 1941, Lerbs 1955, Reynolds et al. 1957, Tosti 1962, Deckert et al. 1964, Blaurock 1975, Jeracki and Mitchell 1981, Hanson 1986, Applin et al. 1994, Campos and Lau 2006, Envia 2014, Sree and Stephens 2014, Ferraro et al. 2014, Huo et al. 2019. A range that wide calls for variable pitch, which matters because one account of the last flight names the pitch control system as what failed. The pitch-change mechanism is a further subject, because twisting a loaded blade against its aerodynamic and centrifugal moments is a structural problem and not an aerodynamic one. The coupled behaviour of a turbine and its propeller under pitch control is treated in Oppenheimer and Jacques 1951, and the actuator and control design problem in Steinetz et al. 1986 and Schwartz et al. 1986, the latter two from the propfan era rather than this one. Helical tip Mach number at 60 metres per second, the fastest conversion speed tabulated above, is

\[M_{\text{tip}} = \frac{\sqrt{(\pi n D)^{2} + V^{2}}}{a} = \frac{\sqrt{280.9^{2} + 60^{2}}}{340.3} = 0.844 \tag{31}\]

so the blade tips are transonic while the aircraft is not. Direct measurements of the interference between a propeller and the wing behind it, the defining aerodynamic problem of the configuration, appear in Winston and Huston 1962, Goland et al. 1964, and Butler et al. 1966.

The Downwash

A disc loading of 82.1 pounds per square foot is seven times a helicopter’s, and the slipstream leaving the propellers at eighty metres per second has to go somewhere. Near the ground it strikes the surface, spreads, and recirculates, which changes the lift, erodes unprepared surfaces, and can ingest debris.

This article computes none of that and should say so. The lift side of it was measured for this aircraft. Schade’s paper in the 1960 conference compilation, Conference on V/Stol Aircraft 1960, Conference on V/Stol Aircraft a Co, reports that tilt-wing configurations usually experience a small favourable ground effect, that the effect was greater for a model of the X-18 because of its wide flat-bottomed fuselage, that full-scale X-18 tests verified a favourable ground effect of about the same magnitude, and that the ground made the model’s attitude stable as it approached. The smaller VZ-2 met the opposite kind of trouble, with ground interference causing erratic motions that limited operation within 19 feet of the ground without automatic stabilisation, in Pegg’s flight tests. Ground effect at this disc loading is studied in Schuldenfrei 1942, Huston and Winston 1960, Obryan 1960, Morse and Newhouse 1960, Curtiss et al. 1985, Eshlemen 1985, Eshleman et al. 1986, Allen 2004, Radhakrishnan and Schmitz 2005, Radhakrishnan and Schmitz 2006, Hwang and Kwon 2019, Greene 2020, and the X-13 article met the same problem from the jet-lift side. A tilt-wing at this disc loading still needs a prepared surface against erosion and debris, though not for the loss of lift that Schade finds cannot be eliminated by fixes on a single-jet aircraft, a constraint that the transport mission the X-18 was built to prove would have inherited.

The Flight Test Record

The X-18 made twenty flights between November 1959 and July 1961, and the inventory calls the flight test programme short and inconclusive. No source records a hover or a completed conversion. The wing was tilted in flight, and the compiled specification gives a maximum wing-tilt speed of 178 miles an hour, but the hover control was still to be tested on the ground when the programme ended.

The sources disagree about how the flying ended. The inventory says that an engine failure on the twentieth flight prematurely terminated the flight test programme. The encyclopaedia entry says that on that flight, in July 1961, the X-18 had a propeller pitch control problem while attempting to convert to a hover at ten thousand feet and went into a spin, from which the crew regained control and landed. Neither account is a flight-test report. The two are compatible on the inference that a pitch control fault on one propeller of an aircraft without cross-shafting acts as a partial engine failure, but no source says so. The X-18 never flew again. In the encyclopaedia entry, ground testing continued, a vertical take-off test stand was built on which a single engine run reached the full 15 foot wheel height, and the programme was cancelled on 18 January 1964 before further stand testing, which agrees with the Air Force history in dating the end of the programme to 1964. The entry says the aircraft was cut up for scrap, while the inventory finds no definitive information on its fate and says only that it is generally assumed to have been scrapped at Edwards Air Force Base.

How Much Asymmetry That Took

Asymmetric propeller pitch is asymmetric thrust, which is both a direct rolling moment and an asymmetric slipstream, so the two wings stall at different times. A fractional thrust difference $\varepsilon$ gives

\[M_{\text{roll}} = \varepsilon\, T y \tag{32}\]

and the aileron authority available must exceed it. At ten thousand feet, where the density is 0.9046 kilogrammes per cubic metre or 73.8 percent of sea level,

Speed	Aileron moment	Tolerable thrust asymmetry
30 m/s	8.2 kN m	3.04 percent
40 m/s	14.5 kN m	5.40 percent
50 m/s	22.7 kN m	8.44 percent

A few percent of thrust asymmetry exhausts the roll control. A pitch control failure on a propeller is not a small disturbance, so a departure is the expected outcome rather than bad luck.

There is a further and slightly bitter point. The same asymmetry at sea level would be tolerable up to 4.12 percent at thirty metres per second rather than 3.04, because

\[\frac{\varepsilon_{\text{SL}}}{\varepsilon_{10{,}000}} = \frac{\rho_{\text{SL}}}{\rho_{10{,}000}} = 1.354 \tag{33}\]

Converting at ten thousand feet rather than near the ground cost about 26 percent of the available roll authority. The altitude gave room to recover, and it made the departure more likely while making it more survivable. Both of those are true and the programme got the survivable half.

Comparison With Ground Prediction

The tilt-wing was tested extensively in wind tunnels before and during the X-18’s life, including the large-scale unswept tilt-wing tests of Giulianetti and Weiberg 1964, and the neighbouring convertiplane had full-scale longitudinal stability tests of the XV-1 in Hickey 1956. The smaller Vertol VZ-2 flew the configuration first, and Pegg’s summary of its flight tests found its hovering control power inadequate in yaw, marginal in pitch and excessive in roll. Hiller force-tested and flew a remote-controlled one-eighth scale model of the X-18 in 1958, in reports catalogued in the Lindenbaum collection, and small-scale X-18 model data on ground effect appear in Schade’s 1960 paper.

For the XC-142A that followed, descent is what the small tunnel models got wrong. Goodson’s comparison of wind-tunnel and flight results records that models predicted the slow-speed level-flight characteristics very well but that small models underpredicted the airplane’s descent capability, while models of about half scale agreed better.

What the ground testing did not predict, and arguably could not, is the consequence of a control failure during conversion. A wind tunnel measures the vehicle’s aerodynamics. It does not measure what happens when a propeller governor misbehaves at a moment when the aircraft has almost no roll authority. The X-18’s loss was a systems failure expressed through an aerodynamic vulnerability, and only the second half of that is testable on the ground.

What the Data Changed

The configuration went forward and the aircraft did not. The LTV XC-142 followed, and the inventory records that X-18 data was used in its design and development. It had four propellers rather than two along the wing and, in the Air Force history, engines linked so that a single engine could turn all four propellers and the tail rotor. Every one of those changes addresses something this article has computed.

Four propellers on a wing immerse more of it than two. Cross-shafting removes the engine-out roll upset entirely, because a failed engine no longer removes a propeller. The X-18’s contribution is a demonstration of what a minimum tilt-wing cannot do, and the next aircraft was designed against that list.

What it did not change is the underlying limit. The outer wing is still stalled during conversion on any tilt-wing, and descent remained the critical region for the XC-142A, whose descent capability small tunnel models underpredicted in Goodson’s comparison and whose lateral and directional motion becomes less stable as the descent angle increases in tests of a tenth-scale model reported by DiCarlo. The configuration was eventually set aside in favour of the tilt-rotor. In the survey of Deckert and Franklin in 1989, the tilt-wing line of the VZ-2, X-18, CL-84 and XC-142 has no ongoing research and technology, while the tilt-rotor line of the XV-3 and XV-15 has the V-22 scheduled for full-scale development. The tilt-rotor keeps the wing pointed into the wind and tilts only the rotors, which is the arrangement that survives today in the V-22.

The Contemporary Literature

Cluster	Records
Flight control, handling qualities and hover control power	945
Wing stall, maximum lift and high-lift devices	918
Tilt-rotor and other V/STOL configurations	881
Propeller aerodynamics, static thrust and contra-rotation	700
Momentum theory, rotor aerodynamics and hover performance	604
Noise of propellers and lifting rotors	508
Propeller slipstream and wing interaction	448
Ground effect, downwash and the vertiport	390
Transition, the conversion corridor and its optimisation	302
Electric vertical take-off and urban air mobility design	264
Energy, batteries and sizing	266
The tilt-wing configuration	249
Distributed electric propulsion	240
Certification, airspace and operations	226
Engine failure, cross-shafting and redundancy	165
Wind tunnel testing and the correlation with flight	133
Descent and the vortex ring state	130
The atmosphere and the flight condition	66
Computational methods, surrogates and autonomy	71
Rotor and airframe structures, dynamics and reliability	70
Powerplants, turboprops and jet-lift propulsion	50
Other rotorcraft and powered-lift literature	146
Total	7,772

The tilt-wing was abandoned after the CL-84, which first flew in 1965, and returned with the GL-10 of 2014 and the Vahana of 2018, so the subject is live rather than historical. Such continuity is unusual in this series. Most of these aircraft asked a question that was answered and closed. The X-18 asked one that was set aside for fifty years because the answer was too expensive, and then became affordable for a reason nobody in 1959 could have anticipated.

The review below is organised by the analysis above, so that each modern field can be set against the quantity it addresses. Recent work on the tilt-wing and on the electric vertical take-off field around it includes 국립한국교통대학교 경영학과 교수 and Kwak 2026, Barsotti et al. 2026, Beak and Kim 2026, Bosch et al. 2025, Burton et al. 2026, Cai et al. 2026, Chaohui et al. 2026, Choi et al. 2026a, Choi and Suk 2026, Critchfield and Ning 2026, Deng et al. 2026c, DiMaggio et al. 2026, Gandhi et al. 2026, Gholamian and Beik 2026, Han and Pei 2026, Hasselmann 2026, Hong et al. 2025a, Hu et al. 2026c.

Propeller and Wing Interaction Became Computable

The interference the X-18 could only measure is now simulated, in Fei 2019 and Zizkovsky and Klesa 2019, with transient rotor and wing interaction for tiltrotors in Wu et al. 2019.

Those methods compute properly the quantity estimated here with momentum theory and a contraction factor. The immersed fraction is no longer a ratio of diameters but a computed pressure field.

Distributed Electric Propulsion Changes the Immersed Fraction

The X-18’s fundamental limitation was that two propellers immerse only part of a wing. Electric propulsion removes the reason there were only two. A distributed arrangement of many small propellers can immerse nearly the whole span, and the keystone then disappears.

The Keystone Was Dissolved Rather Than Solved

This article’s keystone is the immersed fraction, and its value for the X-18 was set by having exactly two propellers. Nothing about tilt-wings requires two. Each one needed a turboprop and a gearbox of its own, and the X-18 had two because it was built around the two turboprops surplused from the cancelled tail-sitter programmes, in the inventory.

Electric propulsion breaks that tie between each propeller and a dedicated engine. Spread along the span, many small motors immerse essentially all of it, and their aerodynamics, stability, noise and powertrain are studied in Chen et al. 2025a, Chen et al. 2025b, Liu et al. 2025c, Machado et al. 2025, Ni and Lee 2025, Shang et al. 2025, Böhnisch et al. 2026, Chen et al. 2026b, Ciliberti and Nicolosi 2026, Deng et al. 2026b, Keller 2025, Shen et al. 2026, Wang et al. 2026c, Wei et al. 2026a.

That does not solve the X-18’s problem. It deletes it. With the whole span immersed there is no un-immersed panel to be stalled through the conversion, the quantity this article spends its length computing goes to unity, and the tilt-wing becomes what its advocates always claimed it was. The configuration was not wrong in 1959 and was not buildable then either, a distinction the historical record tends to blur.

Interaction Is Computed Rather Than Measured

The propeller and wing interference that the X-18 could only obtain from wind tunnels and pressure taps, and the rotor-on-rotor interference of coaxial and compound configurations, are now modelled, simulated and measured with modern instruments, in Duivenvoorden et al. 2025, Lee and Jung 2025, Okawa et al. 2025, Pasupuleti et al. 2025, Savino and Zanotti 2025, Comunian et al. 2026, Duivenvoorden et al. 2026, Jun et al. 2026b, Jun et al. 2026a, Koch 2026, Lan et al. 2026, Liu and Xu 2026, Mohamed and Nabawy 2026, Niu et al. 2026, Saetti et al. 2026, Yang et al. 2026d.

The immersed fraction, obtained in the sizing section from a contraction factor and a judgement, is what those methods now resolve. The 0.85 that carries so much weight here is not a quantity a modern analysis would need to guess.

The Corridor Is an Optimisation Problem

The corridor above is computed by hand at six speeds and reported as a margin. The modern treatment optimises the trajectory through it, in Cheng et al. 2022, Cong et al. 2024a, Daud Filho and Belo 2023, Hsu et al. 2024, Li et al. 2024e, Jin and Zhao 2025, Panish and Bacic 2025, Farid and Jungers 2026, Lee et al. 2026b.

The shape of the answer is unchanged and the method is unrecognisable. A conversion schedule is now the output of a constrained optimisation rather than a line on a pilot’s card.

Descent Is Still the Hard Part

Descent is the strongest continuity in this survey. The sizing analysis finds that descent closes the corridor at 284 feet per minute at the slow end, and the modern literature is still working on descent, the vortex ring state, and steep approach, in Efimov and Chernigin 2022, Pickles et al. 2023b, Pickles et al. 2023a, Makeev et al. 2024, Zeng et al. 2024, Qi et al. 2025a, Tran and Lopez 2025, Wang et al. 2025a, Jeong et al. 2026, Makeev 2026a.

Seventy years on, the approach is still the difficult half of a powered-lift flight. The persistence reflects no failure of the intervening work. The underlying problem, a lifting surface meeting air that arrives from below, has no configuration-level fix.

Redundancy Replaced Cross-Shafting

The X-18’s fatal deficiency was two engines with no interconnection. The XC-142 answered with cross-shafting, in the Air Force history. The modern answer is neither, in Antonakis and Biannic 2024, Kang et al. 2023b, Hung and Dai 2025, Jing and Ma 2025a, Liao et al. 2025a, Luo et al. 2025, Ahmadi Dastgerdi and Nabavi-Chashmi 2026, Krug et al. 2026, May et al. 2026a, Strampe and Klingauf 2026, Cui et al. 2027.

With enough independent motors the loss of one is a control-allocation problem rather than a catastrophe, and the rolling moment of 268 kilonewton metres computed above for a two-propeller aircraft becomes a small perturbation for an eight-motor one. The engine-out case stopped being an aerodynamic problem and became a redundancy-architecture problem, a change in the kind of engineering required rather than in its difficulty.

Handling Qualities Became Criteria

The control-power question the X-13, X-14 and X-18 each met separately has turned into a problem of formal criteria and of flight control design, in Deng et al. 2024, He et al. 2024a, Ko et al. 2024a, Li et al. 2024c, Antonakis 2025, Ruggia 2025, Saetti 2025, Su et al. 2025, Cavalcanti et al. 2026, Ioannis and Ioannis 2026, Janetzko et al. 2026, Jing and Ma 2025b, and Kang et al. 2026b. Simplified vehicle operations, meaning low workload and minimum required pilot training, is a design objective rather than an aspiration in Lombaerts et al. 2020a, which would have been an extraordinary claim in 1959.

The Constraint Moved to Certification

The largest single difference between the X-18’s world and the present lies here. A 1959 research aircraft needed to fly. A modern powered-lift aircraft needs to fly, be certified against a category that had to be invented for it, and be operated in airspace it shares, in Veras Neto and de Andrade 2022, Schweiger and Preis 2022, Takacs and Haidegger 2022, Cabaleiro et al. 2024, Cartile et al. 2025, Farooqui 2025, Laplante et al. 2026, Lei 2026, Shubert et al. 2026.

The X-18’s flying ended with a propeller pitch control fault or an engine failure. Its descendants must also satisfy means-of-compliance documents written for their category, which the European Union Aviation Safety Agency was still issuing in 2025, and an article that treated only the aerodynamics would miss where the difficulty now lies.

The Noise the X-18 Never Had to Face

None of the X-18 sources cited here records an acoustic requirement for a 1959 military testbed flown at Edwards. A vehicle intended to operate from a city rooftop has one that may bind before any aerodynamic limit does, in Araghizadeh et al. 2025, Bauer 2025, Goldschmidt and Ukeiley 2025, Jung et al. 2025, Kekus-Kumor and Sieradzki 2025, Kim et al. 2025f, Lotinga et al. 2025, Paswan et al. 2025, Pereira et al. 2025b, Czech et al. 2026, Georgiou et al. 2026, Kyi and Feng 2026, Page et al. 2026, Rizzi et al. 2026a.

Noise is a new constraint, not an old one made stricter. Nothing in this article’s analysis touches it, and a modern tilt-wing designer would trade immersed fraction against tip speed in a way the X-18’s designers never had to consider.

Energy and Sizing, the Modern Disc Loading

The disc loading derived above is 82.1 pounds per square foot and the figure of merit 0.674, and the analysis treats power as something the engines either have or do not. The modern equivalent is energy and the sizing of electrified powertrains, in Hoenicke and Willich 2025, Golombek et al. 2026, Jiang et al. 2026, Jiao and Yang 2026, Li et al. 2026f, Mokotoff et al. 2026, Park 2026a, Park and Park 2026, Qiao and Zhou 2026, Shah and Ansell 2026, Xie et al. 2026a, Yang et al. 2026g, Yang et al. 2026f.

Disc loading has not stopped mattering and has stopped being the binding constraint. A battery-powered vehicle is limited by stored energy rather than by installed power, which inverts the sizing problem the X-18 faced.

Ground Effect and the Vertiport

The downwash this article raises and does not compute reappears as an infrastructure question, in García Crespillo et al. 2024, Guo et al. 2025a, Guo et al. 2025b, Li et al. 2025l, Zhang and Hwang 2025, Lee et al. 2026a, Li et al. 2026l, Lyu and Feng 2026, Mirković et al. 2026, Nagrare and Lieb 2026, Park and Kim 2026, Rohrmeier et al. 2025. A tilt-wing at 82 pounds per square foot needs a prepared surface, and the modern field calls that a vertiport and writes design specifications for it, as in European Union Aviation Safety Agency 2022. The requirement is the same, now with a name and a standard attached.

Methods and Autonomy

Surrogate modelling, reduced-order rotor aerodynamics, multidisciplinary optimisation and autonomous trajectory planning are the current toolset, in Baldan and Guardone 2024, Cornelius and Schmitz 2024, Dabaghian et al. 2025, Doran et al. 2025, Liu et al. 2025e, Lopez and Biancolini 2025, Sterpu et al. 2025, Wang et al. 2025b, Yan and Shi 2025, Yang et al. 2025a, Fernandez et al. 2026, Wang et al. 2026i, Zhang et al. 2026c. The trade performed here by hand across six speeds has become a computed surface.

The Configuration Returned Because the Constraint Changed

Electric vertical take-off aircraft such as the GL-10 and the Vahana have revived tilting configurations at small scale, where the engine-out case is managed by having many motors rather than by cross-shafting two, and where the binding question is certification, not aerodynamics.

Flight control, handling qualities and hover control power

How much authority is enough, and how it is delivered. Hover and low-speed control, handling-qualities criteria and pilot ratings, stability augmentation and reaction control, and the flight control laws of tilt-rotor, tilt-wing, tail-sitter and multirotor vehicles. Handling qualities span the whole record. 257 titles name handling or flying qualities, 54 of the dated ones from before 1970 and 44 from 2019 or later.

Wing stall, maximum lift and high-lift devices

The wing the slipstream does not reach. Stall and maximum lift, post-stall and dynamic stall, leading-edge droop, slats and slotted flaps, boundary layer control by blowing and suction, the jet flap and circulation control. The jet flap is a period device and circulation control outlived it. 47 titles name a jet flap, with a median year of 1972, while 96 name circulation control, with a median year of 2006. Dynamic stall, which the quasi-steady corridor above leaves out, is named in 101 titles.

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Agarwal 1989] [Del Frate 1992] [Delamore-Sutcliffe and Greenwell 2006] [Dell’Orso et al. 2016] [Deparday and Mulleners 2018] [Deparday and Mulleners 2019] [Desalvo et al. 2014] [DeSalvo et al. 2016] [Design and Experimental Evaluation 1994] [Design of the Circulation 1979] [Development of High-Lift Wing 1990] [桝田 et al. 2023] [Di Luca and Breuer 2019] [Di Matteo and Guo 2011] [Diab et al. 2026] [Dias 2016] [Diedrich 1971] [Diehl and Coelho 2024] [Diekmann 2017] [Diekmann et al. 2018] [Dierke et al. 2014] [Dike and Dunn 1958] [Dima et al. 1994] [Dimmock 1957] [Ding et al. 2026a] [Dirlik et al. 1992] [Dixon 2001] [Dolgov et al. 2020] [Doupník and Koutník 2016] [Du et al. 2025b] [Dumlupinar and Murthy 2006] [Dumlupinar and Murthy 2011] [Duran et al. 2024] [Durston and Schreiner 1983] [Lee 2004] [Edwards 2010] [Ekaterinaris 1995] [Ekaterinaris 2000] [El Sayed Mohamed et al. 2017] [Ely and Herring 1978] [Engar and Huson 1983] [Englar 1970] [Englar 1979] [Englar 1987a] [Englar and Huson 1984] [Englar et al. 1977] [Englar et al. 1978] [Englar et al. 1981] [Englar et al. 1984] [Ericsson 1986] [Ericsson and Reding 1976] [Ericsson and Reding 1977] [Esfahani et al. 2016] [Experimental Development 1981] [Exploratory Investigations of Circulation 2006] [Fala 2022] [Fan et al. 2019] [Fan et al. 2022b] [Fang and Menon 2006] [Farrell et al. 1994] [Faure and Leogrande 2020] [Favier et al. 1986] [Fei et al. 2018] [Feistel and Morelli 1980] [Feistel et al. 1978] [Feistel et al. 1981] [Fejtek and Roberts 1992a] [Felker et al. 1987] [Ferrecchia et al. 1999] [Findlay and Guruswamy 2000] [Fiorini 1961] [Fisher et al. 1956] [Fluctuating Pressures on Aircraft 1976] [Forsythe and Woodson 2003] [Foster 1971] [Francannet et al. 2023] [Franke 2015] [Franke et al. 1993] [Franke et al. 1995] [Friedman et al. 2008] [Friedmann and Reyna-Allende 1977] [Frith and Wood 2003] [Frolov 2019] [Frolov 2021] [Full Reynolds-Stress Modeling 2006] [Funda and Anlr 2022] [Furlong and Fitzpatrick 1947] [Gao et al. 2025a] [Gardner et al. 2023] [Garland 1964] [Gentry et al. 1994] [Ghassemi Isfahani et al. 2017] [Ghee and Taylor 2000] [Ghosh et al. 2026] [Gielow 1971] [Gillan and Cooper 1994] [Goharshadi and Mirzaei 2022] [Goldthorpe et al. 2010] [Goman et al. 1992] [Gong et al. 2014] [Gonzalez and Winkelmann 1993] [Gooden] [Gopalarathnam and Segawa 2008] [Gordnier and Visbal 2004] [Gore and Joshi 2026] [Grafton et al. 1982] [Graham and Luskin 1946] [Grantz 1985] [Green and Galbraith 1994] [Green and Ott 2003] [Green and Ott 2005] [Greenblatt 2005] [Greenblatt 2006] [Greenblatt 2010] [Greenblatt and Wygnanski 1999] [Greenblatt and Wygnanski 2002] [Greenblatt et al. 2016] [Greene 1977] [Griffin et al. 1958] [Grohsmeyer et al. 1991] [Gross and Fasel 2012] [Gross et al. 2016] [Grove 2006] [Gubsky et al. 2018] [Guenther et al. 2007] [Guerreiro and Hubbard 2008] [Gunasekaran and Mukherjee 2016] [Guo et al. 2015] [Guo et al. 2024a] [Hackett and Lyman 1973] [Hagerman 1947] [Hall and Dodbele 1999] [Hall and Woodson 2003] [Hamasaki and Suzuki 2013] [Hammer et al. 2021] [Harun 2026] [Hassan 2005] [Haucke and Nitsche 2011] [Haucke et al. 2008] [He] [He and Ronald 1994] [He et al. 2020c] [Hebert and Joseph 1970] [Hebert et al. 1970] [Hefazi et al. 2013] [Heine et al. 2011] [Helmbold 1958] [Henderson 1978] [Heragu 1992] [Hess 1986] [Hickey and Aoyagi 1960] [Hicks et al. 1975] [Higgins 1936] [Higgins et al. 2022] [Hipp et al. 2016] [Hirano et al. 2001] [Hoadley and Pederson 2001] [Hoburg and Tedrake 2009] [Hoell et al. 2011] [Hong and Roberts 1995] [Hord and Lian 2014] [Horton and Von Doenhoff 1949] [Horton et al. 1950] [Hosangadi et al. 2015] [Hough 1979] [Hrynuk and Bohl 2020] [Hu 2013] [Hugo and Jumper 1992] [Hussei̇n et al 2021] [Huston et al. 1963] [Hutchinson 2019] [Huyssen et al. 2012] [Hwang et al. 1994] [Hysteresis Assumptions for Propeller 2018] [Ichikawa et al. 2021] [Imumbhon et al. 2022] [Ishibashi and Miyaji 2014] [Ishii et al. 1986] [Ives and Melnik 1974] [Iwaki and Miyao 1973] [Izumi 2010] [Jalil et al. 2024] [James et al. 2018] [Jamwal et al. 2018] [Jaquet 1953] [Jarrah 1989] [Jarrah 1990] [Jee] [Jenkins 1971] [Jeon et al. 2023] [Jeon et al. 2025] [Jing et al. 2024] [Jirasek and Amoignon 2009] [Johns et al. 1979] [Johnson 1970] [Johnson et al. 1979] [Johnson et al. 1980] [Johnson et al. 1994] [Jones et al. 2017] [Joseph and Badrya 2026] [Joseph et al. 2026] [Baculi et al] [Jouannet and Krus 2002] [Jovičić and Breuer] [Xiong et al] [Kang Ning and Shi YouMin 2018] [Kanistras et al. 2014] [Kanistras et al. 2015b] [Kanistras et al. 2015a] [Kanistras et al. 2018] [Karim and Acharya 1993] [Karim and Acharya 1994] [Katz and Feistel 1987] [Katz et al. 1995] [Kaufmann et al. 2016] [Kaushal 2026] [Kaza and Kvaternik 1976] [Kelley and Rouser 2025] [Kelly 1957] [Kelly et al. 1958] [Kentfield 1993] [Kerney 1971] [Khodadoust and Shmilovich 2007] [Khodadoust and Washburn 2007] [Kiedaisch et al. 2007] [Kieszek et al. 2024] [Kim et al. 2011b] [Kim et al. 2015] [Kirby 1956b] [Kobayakawa et al. 1993] [Kobayashi and Chiba 2025] [Kok et al. 2017] [Koklu et al. 2019] [Komerath et al. 1993] [Kondor et al. 2003] [Kong et al. 2026] [Koratkar and Chopra 2001] [Korbacher 1964] [Kornilov 2018] [Kornilov et al. 2014] [Kotansky and Glaze 1978] [Koyama Maldonado et al. 2017] [Krasnoff 1969] [Kumar et al. 2021] [Kumar et al. 2026] [Kurkova et al. 2026] [Kweder et al. 2010] [Kweder et al. 2014] [Kähler et al] [Kölzsch et al. 2016] [Küppers and Reinicke 2022] [Landman 1995] [Landsberg and Krasnoff 1972] [Bickmeier and Levitt] [Laurie and Farokhi 1993] [Le Pape et al. 2012] [Lean 1959] [Lee 1988] [Lee and Gross 2024] [Lee and Roberts 1990] [Lee and Su 2010] [Lee et al. 2005] [Lee et al. 2025c] [Lee et al. 2026d] [Leknys et al. 2018] [Lenfers et al. 2016] [Leos et al. 2023] [Levinsky and Ramsey 1972] [Levy and Zickuhr 2007] [Li and Scarano 2024] [Li et al. 2022a] [Li et al. 2025f] [Li et al. 2026g] [Li et al. 2026i] [Lichtwardt and Marshall 2011] [Liebeck and Ormsbee 1969] [Lift Coefficient According 1997] [Lindblad and de Cock 1999] [Lindsay 2021] [Lipson 1946] [Lissaman 1969b] [Lissaman 1973] [Little and Samimy 2010] [Little et al. 2008] [Little et al. 2009] [Liu et al. 2001] [Liu et al. 2004] [Liu et al. 2005] [Liu et al. 2011] [Liu et al. 2020] [Lizak 1960] [Lo 1970b] [Lopez and Shen 1971] [Lorber 1992] [Lorber et al. 1991] [Loth and Boasson 1983] [Loth and Boasson 1984] [Loth et al. 1974] [Lu et al. 2022b] [Luchkov et al. 2020] [Luckring 1978] [Luitel and Karki 2025] [Luitel and Karki 2026] [Holman et al. 2012] [Magrini et al. 2024] [Mai et al. 2008] [Maki 1959] [Man and Fung 1995] [Manar and Jones 2017] [Manning et al. 2025] [Manor et al. 1993] [Marañon et al. 2014] [Marchman and Chang 1988] [Margason and Morgan 1975] [Marouf et al. 2019] [Marouf et al. 2024] [Martinez-Rodriguez and Takahashi 2022] [Masuda et al. 2024] [Mathias et al. 1996] [Matiz-Chicacausa and Sedano 2018] [May and Widdison 1971a] [May and Widdison 1971b] [McBreen and Zha 2024] [McCloud 1972] [McCullough and Gault 1947] [McCullough and Gault 1948] [McGowan et al. 2006] [McKechnie and Barakos 2025] [McKechnie and Barakos 2026] [McLemore 1958] [McLemore and Peterson 1960] [McMillan et al. 1984] [McVeigh and McHugh 1984] [McVeigh et al. 1975] [Measurement and Analysis 2006] [Melo De Sousa and Camara 2013] [Memon and Altman 2016] [Mendenhall and Perkins 1999] [Menees 1958] [Miklosovic and Perry 2014] [Miklosovic et al. 2012] [Miklosovic et al. 2016] [Milillo 1972] [Millikan 1934] [Min et al. 2026a] [Mixson et al. 1975] [Miyakawa et al. 1993] [Mizoguchi et al. 2014] [Mokhtarian and Modi 1984] [Mongin et al. 2023] [Monner et al. 2009] [Monner Hans Peter and Riemenschneider Johannes 2012] [Moosavi 2025] [Moriya et al. 2024] [Morris et al. 2020] [Mouton et al. 2026] [Mukherjee et al. 2003] [Nair and Goza 2022] [Narramore 1981] [Narramore 1987] [Nayman and Perez 2022] [Nelson and Mouch 1978] [Newsom et al. 1982] [Nichols and Englar 1980] [Nichols and Englar 1981] [Nikolic 2007] [Nimmanmongkol et al. 2023] [Niu et al. 2018] [Nonweiler 1955b] [Nonweiler 1955a] [Northrop Aircraft INC Hawthorne CA 1952] [Northrop Aircraft INC Hawthorne CA 1953] [Northrop Corp Hawthorne Ca Norair Div 1964b] [Northrop Corp Hawthorne Ca Norair Div 1964a] [Nikkhoo and Esmaeili 2023] [O’Hara et al. 2005] [O’Hara et al. 2006] [Oh and Tavella 1986] [Okoronkwo et al. 2026b] [Browne et al] [Olson and Stridsberg 1979] [On the Role 2018] [Orazi et al. 2011] [Ormiston 1972] [Ormsbee and Chen 1972] [Ortiz-Melendez et al. 2019] [Ortiz-Melendez et al. 2020] [Ortiz-Melendez et al. 2022] [Ortiz-Melendez et al. 2023] [Oshima 1994] [Otsuka et al. 2022] [Otto et al. 2022] [Overview of Circulation Control 2006] [Owen 1995] [Ozgören et al. 2002] [Pandya et al. 2011] [Papadakis et al. 1996] [Paranjape 2022] [Parikh et al. 1990] [Pasandideh Fard and Sahaf 2016] [Passamanick 1948] [Patten 1988] [Patterson and Bartlett 1987] [Patton 2004] [Pavelka and Tatum 1980] [Pavelka and Tatum 1981] [Pavlenko and Pigusov 2018] [Pavlenko et al. 2023] [Pavlenko et al. 2026] [Perry and Miklosovic 2012] [Pershing 1964] [Peters 1975] [Peters and Schrage 1978] [Petrilli et al. 2013] [Petz and Nitsche 2007] [Petz et al. 2006] [Pfingsten and Radespiel] [Pham] [Phelps and Smith 1973] [Phelps et al. 1973] [Phelps et al. 1976] [Phillips and Alley 2007] [Pisano et al. 2025] [Pivko 1957] [Platzer 1976] [Pneumatic Flap Performance 2006] [Pohl and Semaan 2020] [Polak 1972] [Polevoy et al. 2022] [Polhamus 1966] [Polonsky 2026] [Poplingher and Raveh 2023] [Posada] [Post and Corke 2003] [Prabhakar 2013] [Precup et al. 2015] [Pugliese and Englar 1979] [Pullin and Simmons 1985] [Pınar and Özer 2026] [Qu et al. 2026b] [Quackenbush et al. 2020] [Quan et al. 2013] [Quigley et al. 1960] [Quigley et al. 1974] [Quinn 1946] [Quinn 1947a] [Quinn 1947b] [Qureshi et al. 2006] [Gunadi 2013] [Rahal and Dutta 2024] [Stallings 1986] [Racisz and Quinn 1948] [Ramakrishna et al. 2025] [Ramirez Zeigler and Avery 2026] [Ran et al. 2012] [Rane and Sahni 2018] [Rao 1984] [Rao 1992b] [Rao 1992a] [Raspet 1957] [Razak 1954] [Reader 1980] [Reddy and Woszidlo 2023] [Reed 1954] [Regenie et al. 1992] [Reisenthel 1995] [Reisenthel and Childs 1994] [Report No. 618 Comparative 1938] [Reuster and Baeder 2000] [Reuster and Baeder 2001] [Kuhn and McKinney 1965] [Ritter 2015] [Rival et al. 2010] [Rizzetta and Garmann 2024] [Rizzetta and Garmann 2025b] [Rizzetta and Garmann 2025a] [Rizzetta and Visbal 2016] [Roberts 1965] [Robertson et al. 2014] [Rockwell 1993] [Rohith and Sinha 2017] [Role of Turbulence Modeling 2006] [Rom 1992] [Roos 1996] [Ross and Perkins 1992] [Ross and Perkins 1994] [Ross et al. 1991] [Roy and Mukherjee 2020] [Hariyadi et al. 2022] [Saadi and Bahi 2018] [Saenz et al. 2021] [Saez] [Sahin et al. 2000] [Sahin et al. 2003] [Salari and Roache 1990] [Salem Said and Ragab 2008] [Samuel and Mukherjee 2016] [Sang 2009] [Sang et al. 2007] [Sano et al. 1984] [Santos et al. 2024a] [Santos et al. 2024b] [Sarlak et al. 2018] [Sato et al. 1993] [Satran et al. 1985] [Scheib and Sandlin 1985] [Schlichting and Gersten 2000] [Schlichting and Gersten 2016] [Schmeer 1955] [Schmeer 1956] [Schmeer and Cooper 1955] [Schmidt and Wild 2026] [Schollenberger et al. 2023] [Schumacher 1970] [Schuster and Byrd 2003] [Schuster and Byrd 2004] [Schwartzberg 1959] [Schweikert et al. 2022] [Sears 1983] [Segall and Gajdjis 1991] [Seifert et al. 1993] [Sellars et al. 2002] [Sellers et al. 2002] [Selvaraj and Sharma 2019] [Semaan 2020] [Semaan et al. 2018] [Sementi 2002] [Semeraro et al. 2019] [Seraj and Martins 2021] [Seraj and Martins 2022] [Sereez et al. 2024] [Shahrokhi et al. 2024] [Shankara and Snyder 2012] [Sharp 1950] [Shen and Qin 1986] [Sheppard and Rival 2018] [Shigemi 1993] [Shiihara et al. 2025] [Shinohara et al. 1974] [Shivers 1967] [Shojae and Karimian 2024] [Siliang et al. 2019] [Silva and Wolf 2023] [Simulation of Steady Circulation 2006] [Sinha et al. 1984] [Skillen et al. 2013] [Smeltzer et al. 1983] [Smith 1981] [Smith and Levin 1981] [Smith et al. 1974] [Somers 2005] [Sommerwerk et al. 2013] [Sorenson 1974] [Sosa et al. 2004] [Sosa et al. 2006] [Spence 1956] [Spence 1958] [Stalker 1935] [Stall Characteristics 2003] [Stall Speed Measurement 2003] [Stallings and Lamb 1981] [Staples and Nagati 1990] [Starikovskiy 2017] [Starikovskiy et al. 2017] [Sterpu et al. 2025] [Stewart 1985] [Stoll and Koenig 1983] [Stoll and Minter 1981] [Stolt et al. 2017] [Storms and Jang 1993] [Stratford 1956c] [Stratford 1956a] [Stratford 1956b] [Stratton and Spyropoulos 2024] [Stuermer 2015] [Sudharsan and Sharma 2021] [Sudharsan et al. 2022b] [Sudharsan et al. 2022a] [Sudharsan et al. 2023] [Sweberg and Dingeldein 1945] [Tagawa et al. 2021] [Tai et al. 1996] [Takallu and Gentry 1992] [Takeda et al. 2001] [Tallarovic and Franke 1994] [Tamaki and Imamura 2026] [Tan et al. 2022] [Tan et al. 2023b] [Tang and Dowell 1992] [Tanner 2007] [Taylor 1969] [Taylor and Gursul 2004] [Telionis 1995] [Telionis 2001] [Teng et al. 2016] [The Pursuit of Maximum 1955] [Чмих et al. 2015] [Thein and Teperina 2016] [Theisen et al. 1973] [Thin Wing Sections 2012] [Thomas 1965] [Thompson et al. 1990] [Tilvaldyev et al. 2025] [Tobak and Schiff 1974] [Tokel and Sisto 1978] [Townend 1931] [Trailing Edge Circulation Control 2006] [Tran and He 2021] [Tran and Nguyen 2021] [Traub 2014] [Traub 2016b] [Traub and Biegner 2013] [Trenka et al. 1963] [Trobaugh et al. 1980] [Troia and Waters 2005] [Truong 2017] [Tu et al. 2019] [Turner et al. 2008] [Twiss et al. 2019] [Tyan et al. 2013] [Uhlig and Selig 2008] [Ullah et al. 2022] [Valarezo and Chin 1992] [Valarezo and Chin 1994] [Valenti and Yukish 2022] [Valls Badia et al. 2025] [Van Den Berg et al. 1992] [Van Dommelen 1995] [van Dommelen and Yapalparvi 2014] [Van Treuren et al. 2025] [Vandyken and Chandrasekhara 1992] [Vasilescu and Dancila 2006] [Vasista et al. 2019] [Vechalapu et al. 2025] [Vechalapu et al. 2026] [Velazquez Salazar et al. 2021] [Vidal et al. 1961] [Vincent et al. 1979] [Vinogradov et al. 2021b] [Vinogradov et al. 2021a] [Visbal and Garmann 2016] [Volle et al. 2026] [von Kármán and Millikan 1935] [Vrchota 2017] [Vu and Lee 2015] [Vukasinovic et al. 2024] [Waggoner and Allison 1987] [Wagner et al. 1984] [Walchli et al. 1992] [Valarezo et al. 1993] [Walters and Ashworth 1974] [Mohamed et al. 2021] [Wang 1979] [Wang and Khalid 2025] [Wang and Zha 2009] [Wang and Zha 2019] [Wang et al. 1985] [Wang et al. 2016c] [Wang et al. 2022d] [Wang et al. 2024c] [Wang et al. 2025i] [Wang et al. 2026e] [Wannenburg 1963] [Ward and Stout 1986] [Watson et al. 2008] [Wei et al. 2025] [Weiberg and Holzhauser 1961] [Weil and Sleeman 1948] [Whitcomb and Norton 1961] [White 1963] [White 1982] [White and Crimi 1961] [White et al. 1976] [Whittle and Fink 1950] [Wild 2021a] [Wild 2021f] [Wild 2021e] [Wild 2021b] [Wild 2021d] [Williams and Alexander 1957] [Williams and Bernitt 1970] [Williams and Howe 1970] [Williams, I and Nelson 1995] [Willmer et al. 1987] [Wilson and Lipera 1984] [Winkelmann and Tsao 1981] [Winkelmann et al. 1980] [Wong 2008] [Wong et al. 1993] [Wood and Nielsen 1986] [Wood and Roberts 1987] [Wood and Roberts 1989] [Wootton 1967] [Wu and Wu 1993] [Wu et al. 1996] [Wygnanski 1966] [Xia et al. 2026] [Xiao 2016] [Xiao et al. 2022] [Xing et al. 2020a] [Xing et al. 2020b] [Xiong et al. 2026a] [Xu and Zha 2022] [Yang 1994] [Yang and Przekwas 1993] [Yang and Zha 2018b] [Yang and Zha 2018c] [Yang et al. 2026i] [Yen 1960] [Yen and Ahmed 2013] [Yon and Katz 1997] [Yongxi Lyu et al. 2016] [Yoo 2018] [Yoshihara and Zonars 1975] [Yuan 1969] [Yuan 1970] [Yuan et al. 2006] [Yuan et al. 2024b] [Zakir et al. 2024] [Zalovcik 1945] [Zarutskaya and Arieli 2005] [Zeising and Gerhardt 1993] [Zhang 2026] [Zhang and Tang 2004] [Zhang et al. 2008] [Zhang et al. 2016a] [Zhang et al. 2016b] [Zhang et al. 2017a] [Zhang et al. 2024c] [Zhang et al. 2026a] [Zhao and Zhao 2015b] [Zhao and Zhao 2015a] [Zhao et al. 2024g] [Zhu and Qiu 2005] [Zhu et al. 2004] [Zohar and Er-El 1988] [Zverkov et al. 2012] [Štorch and Nožička 2017]

Tilt-rotor and other V/STOL configurations

The neighbours that tilt something else. The tilt-rotor and proprotor, the tilt-duct and lift fan, the tail-sitter, jet-lift and deflected-thrust aircraft, and STOL configurations, with the XV-15 and the V-22. Whirl flutter is the tilt-rotor’s own aeroelastic subject. 87 titles name it, the earliest dated one from 1988. The 22 titles that name the XV-15 have a median year of 1982, and the 44 that name the V-22 or the Osprey a median year of 1997.

881 records. [A Preliminary Study 1961] [Abhishek et al. 2017] [Abiko and Harada 2020] [Acree 2005] [Acree 2026b] [Acree and Sheikman 2018] [Adebimpe 2023a] [Adeyemi et al. 2026] [Aiken 1977] [Akinwale and Datta 2023] [Akinwale and Datta 2025] [Aksteter et al. 1994] [Albers and Zuk 1990] [Albers and Zuk 1992] [Albrecht 1972] [Ale Isaac Khoueini] [Alexander et al. 1974a] [Alexander et al. 1974b] [Alford and Harris 1966] [Alford and Luoma 1960] [Alford et al. 1963] [Alperin and Wu 1981] [American Helicopter Society INC Washington DC 1965] [Anantha and Atkins 2023] [Anderson 1977] [Anderson 1983] [Anderson 1990] [Anderson and Innis 1965] [Annamalai and Selvakumaran 2020] [Aoyagi 1979] [Aplicação De Transdutores Piezoelétricos 2022] [Application of Computational Fluid 1990] [Arif and Sasongko 2021] [Armutcuoglu et al. 2004] [Aubert 2007] [Aulehla and Kissel 1981] [Author 1989] [Avionics Displays for V-22 2000] [Набиев and Aбдуллаев 2021] [Набиев et al. 2022] [Baird et al. 1972] [Barfoot 1963] [Barnes] [Basnight et al. 2025] [Bath et al. 2021] [Bath et al. 2022] [Bath et al. 2023] [Bauer et al. 1999] [Bautista et al. 2017] [Bay 1977] [Bayruns and Koenig] [Baêsso et al. 2026] [Bear et al. 1979] [Beard and Foley 1982] [Beebe 1968] [Beeler 1965] [Bell Aerospace Co Buffalo Ny 1970] [Bennett et al. 1988] [Berkowitz 2000] [Bi and Haas 2002] [Biesiadny et al. 1993] [Biggers et al. 1966] [Biggi et al. 2024] [Bilger et al. 1981a] [Bilger et al. 1981b] [Bilger et al. 1982b] [Bilger et al. 1982a] [Binion 1969] [Binion and Lo 1970] [Binion 1970a] [Binion 1975] [Black 1968] [Black and Brownrigg 1966] [Boothe and Ledder 1973] [Borland 1959] [Born et al. 1969] [Bottasso 2003] [Bowen et al. 2025] [Bowman 1955a] [Bowman 1955b] [Bowman 1957] [Bradfield 1981] [Bray 1995] [Brick and Fischer 1998] [Brown 1981] [Brown and Edenborough 1977] [Brown et al. 1977] [Brown et al. 1978] [Bruff and Dagli 2003] [Brunson and Rais-Rohani 1996] [Buchholz 2002] [Buley 1970] [Bullard 1997] [Buller and Toplis 1972] [Burley 1979] [Burstadt and Johns 1983] [Bustamante et al. 2019] [Acree 2022a] [Acree 2022b] [Acree 2024] [Acree 2026a] [Acree et al. 2022] [Cai et al. 2016] [Calvano and Harney 1998] [Campbell 1965] [Campbell 1967] [Campbell 1968] [Cao et al. 2017] [Carico] [Carico and Garcia-Otero 1995] [Carlson and Papachristos 2021] [Carlson and Papachristos 2024] [Carlson and Zhao 2003] [Carpenter et al. 1980] [Cassinelli et al. 2023] [Cassoni 2023] [Cecrdle 2012] [Cecrdle and Malecek 2014] [Cecrdle et al. 2015] [Cecrdle et al. 2017] [Cetinsoy 2014] [Cetinsoy 2015] [Chambers 1971] [Chambers 1991] [Chana and Sullivan 1993a] [Chang et al. 2016] [Charnov 2006] [Charnov 2007] [Chattopadhyay et al. 1995] [Chaybi 2016] [Chen et al. 2019a] [Chen et al. 2020b] [Cheney 1977] [Choi and Kim 2010] [Chopra and Srinivas 1996] [Chu et al. 1983] [Churchill and Gerdes 1984] [Clarke et al. 1973] [Clough 1990] [Cobey 1953] [Collins et al. 2008] [Collins et al. 2009] [Convertiplane Described 1959] [“Convertiplane” 1959] [Cook 1985] [Cook and Hickey 1965] [Cook and Hickey 1967] [Coolican 2002] [Cooper et al. 2009] [Coplin 1967] [Corle et al. 2019] [Cornish 1964] [Corsiglia et al. 1989] [Coty and Kesling 1967] [Courtin et al. 2020] [Crafa and Reed 1980] [Craig 1961] [Craig and Heffley 1972] [Craig et al. 1991] [Crane and Schade 1965] [Cronkhite and Tanner 1985] [Crossley and Bass 1992] [Cummings and Hall 2002] [Cummings et al. 2020] [Cunningham 1976] [Currie 1999] [Curtiss 1969] [Curtiss and Warburton 1992] [Czyba and Kronhof 2020] [da Luz et al. 2025] [Dall’Aglio et al. 2022] [Dansby et al. 1964] [Davenport et al. 1972] [Davis 1964] [Davis and Mertens 1958] [Deal et al. 1967a] [Deckert 1967] [Deckert 1977] [Deckert 1979] [Deckert 1993] [Deckert and Hickey 1967] [Deckert and Hickey 1970] [Deckert and Holzhauser 1973] [Defense Science Board Washington Dc 1979] [DeHoff 1979] [Deng et al. 2025a] [Denham 2002] [Denning 1972] [Design and Simulation 2025] [Design, control, and autonomous] [Detore and Gaffey 1969] [Dewa et al. 2024] [Dicarlo et al. 1966] [Diedrich et al. 1971] [Ding et al. 2025] [Doherty and Butzel 1979a] [Dong and Li 2022] [Doonan 1984] [Doonan et al. 1983] [Dougherty 1968] [Dreier 2007] [Dreier 2017] [Dreier 2026] [Ducted Fan Model Ala 2026] [Dudley 2016] [Dudley et al. 1990] [Duffy et al. 2012] [Dumond 1969] [Dunn 1966] [Eberhard and Salbashian 2013] [Eckard and Poth 1983] [Edenborough 1967] [Edenborough 1968] [Egerton and Fitzpatrick 1967] [Eisenberg 1982] [Eisenberg and Bowles 1986] [Elliott 1991] [Emelyanova et al. 2017] [En Chao 2013] [Enenakpogbe et al. 2024b] [Enenakpogbe et al. 2024a] [Englar and Campbell 2002b] [Englar and Campbell 2002a] [Englar and Campbell 2005] [English et al. 1966] [Erhart et al. 1980] [Escareno et al. 2006] [Eskey et al. 1984] [Espinosa and Groepler 1992] [Experimental Development and Evaluation 2006] [Faass 1998] [Falarski et al. 1980] [Falarski et al. 1981] [Falarski et al. 1982] [Favale et al. 2021] [Feddersen and Cea 1977] 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2019] [Kreshock et al. 2026] [Kroeger and Martin 1967] [Kuhn 1960] [Kuhn 1967] [Kuhn 1980] [Kunz 2002] [Kunz 2005] [Kvaternik 1992] [Lam 1998] [Landfield and Henderson 1984] [Laudeman 1972] [Lavi 1966] [Lebacqz and Aiken 1976] [Lebrun et al. 2015] [Lee 2013] [Lee and Lee 2013] [LeGresley et al. 2000] [Levine and Inglis 1989] [Lewis 1984] [Lewis and Lewis 1981] [Li 2024b] [Li and Xia 2014] [Li and Xia 2017] [Li and Xia 2018b] [Li et al. 2024a] [Lichota 2023] [Lieblein 1970a] [Light 1997] [Lim 2019] [Lim and Jung 2025] [Lin et al. 2024a] [Linnell 1963] [Liu 2023] [Liu and McVeigh 1991] [Liu et al. 1994] [Liu et al. 2022b] [Liu et al. 2023b] [Liu et al. 2023a] [Lo 1970a] [Lo 1970c] [Lo 1971] [Loewy 1969] [Loscutoff et al. 1973] [Louma 1961] [Lovera et al. 2026] [Lu et al. 2016] [Lu et al. 2021] [Luoma 1961] [Lyu] [Ma et al. 2022d] [Ma et al. 2025b] [Ma et al. 2027] [Magee 1983b] [Magee 1983a] [Magee and Alexander 1976] [Magee and Wernicke 1979] [Magee et al. 1975] [Maggitti 1965] [Magliocco 2026] [Magliocco et al. 2026] [Magnuson et al. 1992] [Mair et al. 2018] [Mair et al. 2019] [Mair et al. 2021] [Maisel et al. 2000] [Maita et al. 1983] [Major STOL Modification Planned 1986] [Mancini and Marshall 2025] [Marchese 1963] [Margason 1982] [Margason 2002] [Margason and Hoad 1980] [Margason and Kuhn 1988] [Mark and Dehart 1976] [Marks 1956] [Marks 1957] [Marques] [Marr and Neal 1972] [Marsh 1967] [Marshall 1971] [Marshall 1991] [Martin and Ostlund 1989] [Martin and Tung 2004] [Mascarello et al. 2017] [Mattaboni et al. 2012] [Matthys and Scroggs 1984] [May and Bean 1975] [Mayer and Wozniak 2006] [Mazzitelli 1957] [McKinney and Newsom 1967] [McCarthy and Chattopadhyay 1996] [McCormack and Poteate 1965] [McDade and Spencer 1992] [McElreath 1972] [McIntyre 1963] [McKinney and Newsom 1968] [McVeigh et al. 1990] [McVeigh et al. 1997] [McVeigh et al. 2004] [McVeigh et al. 2011] [Meakin 1993] [Melgaard 1986] [Mello and Kotansky 1985] [Mercker et al. 1999] [Michaels 1969] 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[Osterman and Mulley 1977] [Harendra et al. 1973] [Pagano 2018] [Paik and Gandhi 2010] [Parikh and Joppa 1986] [Parlett 1961a] [Parlett 1961b] [Pauli 1964] [Pauli 1965] [Payne and Henry E. 1961] [Peaslee 1971] [Pei and Roithmayr 2022] [Peterson 1964] [Petit and Scholey 1973a] [Petit and Scholey 1973b] [Petit and Scholey 1973c] [Pfeiff 1965] [Pilsch 1975] [Pinson and Ryan 1972] [Platzer and Margason 1976] [Pogust and Taylor 1972] [Pope 2009] [Potonides 1979] [Potonides et al. 1979] [Potsdam and Silva 2004] [Poulin and Katz 1991] [Price 1964a] [Price 1964b] [Pricker and Armanini 2023] [Primatesta et al. 2022] [Przedpelski 1965] [Qi et al. 2024b] [Qing et al. 2022] [Quackenbush et al. 1995] [Quigley 1964] [Quigley and Koenig 1960] [Quigley and Koenig 1961] [Quintana et al. 2020] [Quintana et al. 2021] [Quintana et al. 2022] [Quintana et al. 2023] [Rae 1967] [Rae and Shindo 1969] [Raeisi 2021] [Raiford and Dall 1993] [Rais-Rohani and Baker 1994] [Ramirez et al. 1980] [Rangacharyulu and Moore 1991] [Ransone 1972] [Ransone 2002] [Razak and Craig 1961] [Reber 1993] [Reed and Avery 1966] [Reeder 1965] [Reeder 1967] [Renselaer 1974] [Representative Operations of V/STOL 2002] [Reveles and Rajagopal 2024] [Reveles et al. 2019] [Rhoads et al. 2013] [Riccius 1984] [Rich et al. 1964] [Riebe 1973] [Riesenfeld] [Riesenfeld 1968] [Riso 2024b] [Riso 2024a] [Riso 2025] [Roberts and Anderson 1977] [Roberts and Anderson 1981] [Roberts et al. 1981] [Robinson 2015] [Rodenbaugh and Veno 1965] [Roelke and Zigan 1972] [Rogers and Reisdorfer 1993] [Rosenstein and Clark 1986] [Roth et al. 1980] [;;;;; 2006] [Rusbarsky 1990] [Russell and Acree 2018] [Sakai and Miwa 2014] [Sakai and Miwa 2016] [Salter 1975] [Sambell 1972] [Sanders 1964] [Sanderson 1973] [Sasongko and Muhammad 2017] [Savino 2025] [Sawron 2026] [Schaefer and Velten 1971] [Schank 2006] [Schillings and Reinesch 1987] [Schneider and Wilkerson 1990] [Schroers 1982] [Schroers et al. 1979] [Schwartz and Shearer 1964a] [Schwartz and 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Propeller aerodynamics, static thrust and contra-rotation

The propeller at the two ends of the conversion. Static thrust and low advance ratio, operation at high incidence, blade design and pitch control, contra-rotating and ducted propellers, and whirl. Contra-rotation has returned. 42 titles name contra-rotating or counter-rotating propellers, rotors or propfans, with a median year of 2020, while the 20 that name static thrust have a median year of 1969.

700 records. [A “New Type Adjustable-Pitch 2017] [Adamson 1968] [adebimpe 2023] [Adler 1960] [Adnan Fadilah and Furqon Era 2018] [Aerodynamic Design of Low-Speed 1986] [Aerodynamics in the Age 1997] [Aerodynamics of Propellers 2007] [Aerodynamics of Propellers 2018] [Agostinelli et al. 2013] [Nurachmat et al. 2023] [Sugiharto et al. 2025] [Ahmad and Ullah 2026] [Ahmed et al. 2025a] [Ahn and Lee 2013] [Akkoyun et al. 2018] [Al-Sa’D 2023] [Albaker et al. 2015] [Albert et al. 2013] [Alcañiz-Brull et al. 2026a] [Alesin et al. 2020a] [Alexiou et al. 2016] [Alfaridzi and Kurniawan 2022] [Alfiannor et al. 2022] [Aljabri 1983] [Aljabri et al. 1986] [Christy et al] [Christy et al. 2026] [Altamirano et al. 2025] [Amin et al. 2018a] [Amin et al. 2018b] [Amjad and Khan 2017] [Anand et al. 2023] [Appendix L 2002] [Applin et al. 1994] [Arafat et al. 2024] [Arai et al. 2003] [Ardito Marretta et al. 1999] [Army Service Forces Washington Dc 1940] [Asghar et al. 2018] [Atlam and Kolhe 2013] [Atmasari et al. 2020] [Baek et al. 2015] [Baek et al. 2021] [Balcerak et al. 1969] [Balmaseda and Yeo 2025] [Balmaseda Aguirre and Yeo 2026] [Barnes 1999] [Barnes 2017] [Barry et al. 2024] [Barth et al. 2012] [Battelle Memorial Inst Columbus Oh 1959] [Bay and Kara 2025] [Beek 1978] [Behbahani et al. 2011] [Bell Aerospace Co Buffalo Ny 1956c] [Bell Aerospace Co Buffalo Ny 1956a] [Bell Aerospace Co Buffalo Ny 1956b] [Simmons] [Simmons 2021] [Simmons and Hatke 2021] [Bennett and Reed 1963] [Bennett and Thomas 2026] [Berman 2003] [Berry and Chopra 2013] [Berry and Chopra 2015] [Betz 1922] [Betz 1928a] [Betz 1928b] [Betz 1966] [Betzina and Nguyen 2004] [Безпалий and Pushylin 2024] [Biermann 1954] [Biermann and Hartman 1940] [Biot 1940] [Black 2007] [Black and Michael 2003] [Black and Wainauski 1967] [Blade Propeller 2011] [Blaurock 1975] [Blunt 2014] [Bober and Mitchell 1980] [Borst 1968] [Borysiuk and Rudkin 2026] [Boschetti et al. 2015] [Bose 2012] [Boswell and Miller 1968] [Bousquet 1986] [Bousquet and Gardarein 2000] [Boyle 2002] [Boyle 2003] [Boyle et al. 1999] [Bradley 1986] [Bridges 2021] [Bridges et al. 1977] [Brockett 1972] [Brown and Chopra 2023] [Brown and Chopra 2026] [Brusse and Cronk 1965] [Brusse and Kettleborough 1975] [Bryant and Walters 2021] [Burger and Hartfield 2007] [Burnell and Fan 1957] [Burrage 2013] [Cai et al. 2024] [Capitao Patrao et al. 2016] [Carlton 2007c] [Carlton 2007b] [Carlton 2007a] [Carlton 2012c] [Carlton 2012a] [Carlton 2012b] [Carlton 2018] [Carlton 2019c] [Carlton 2019a] [Carlton 2019b] [Carroll and Carroll 2005] [Castles et al. 1960] [Catană and Cican 2016] [Cavcar 2011] [Cazenave et al. 2011] [CFD Results on Propeller 2017] [Chandrasekaran 1987] [Chang and Sullivan 1982] [Chang et al. 2020] [Chang et al. 2024] [Chapman 1989] [Chapter 3. Propeller 1957] [Chauhan and Martins 2024] [Chen 2012] [Chen and Chopra 1995] [Chen and Chopra 1997] [Chen et al. 1989] [Chen et al. 2024a] [Chen et al. 2026f] [Cheng 1969] [Chiaramonte et al. 1996] [Choi and Kinnas 1997] [Chu et al. 2021] [Chung et al. 1990] [Ciftci and Cadirci 2024] [Cinoğlu and Durak 2024] [Clark and Valarezo 1990] [Composite Propeller Blade 1972] [Computer Techniques for Propeller 1976] [Conroy and Matveev 2023] [Controllable Pitch Propeller 1940] [Conway and Biermann 1941] [Coward 1955] [Crandall and Dugundji 1981] [Cronk 1965] [Cross 1976] [Culpepper et al. 2021] [Culpepper et al. 2022] [Cummings 1968] [Curtiss and Howard C. 1969] [Dacharla 2026] [Dai et al. 2025a] [Dantsker et al. 2017] [Davenport et al. 1985] [De Bothezat 1920] [DE Decker 1966] [De Gaudemaris] [De Roche 2025] [de Souza and Ciloni 2021] [De Young 1965] [DeLaurier 2022] [Deng et al. 2017a] [DeStories and Takahashi 2014] [Deyoung 1979] [Di Felice et al. 2003] [Dias et al. 2025] [Diehl 1934] [Dingeldein and Schaefer 1945] [Doan 2023] [Doetsch and Mark 1953] [Dorange et al. 2024] [Dorfling and Rokhsaz 2014a] [Droandi and Gibertini 2015] [Dunham and Gentry 1989] [Dunham et al. 1985] [Dunham et al. 1986] [Dunno 2014] [Dunno and Batt 2009] [Echavarria and Poroseva 2015] [Engine Propeller Matching 2024] [Enos 1937] [Erickson and John C. 1969] [Erickson et al. 1965] [Evans and Liner 1948] [Eyerci̇oğlu and Aladağ 2021] [Fabri and Siestrunck 1953] [Mahmuddin et al. 2023] [Faishal et al. 2024] [Fan et al. 2021] [Fanoe 1974] [Faraaz et al. 2023] [Farghaly et al. 2012] [Farrar and Agarwal 2014] [Fatigue Fracture 2019] [Favier et al. 1988] [Feil et al. 2016] [Feil et al. 2019] [Felli 2020] [Felli et al. 2006] [Feng et al. 2025a] [Fernandez et al. 2023b] [Filippone 2022] [Fisher 1950] [Fortin and Ahuja 2024b] [Fournis et al. 2026] [Fratello et al. 1991] [Fresk and Nikolakopoulos 2014] [Fry 1967] [Tamilselvan and Niresh 2022] [Gahlot et al. 2025] [Gayle and Jeracki 1989] [Gazzaniga and Rose 1992] [Geometry of a screw 2026] [Altamirano et al] [Ghenaiet and Halimi 2014] [Ghoddoussi and Miller 2016] [Gill and D’Andrea 2017] [Gogidze et al. 2023] [Gowtham et al. 2026] [Gran 1973] [Gray 1941] [Gray and Biermann 1941] [Greenberg and Ordway 1964] [Zilliac 2026] [Gu and Kinnas 2003] [Gubskiy et al. 2020] [Gupta and Abdallah 2018] [Gur 2014] [Gur and Rosen 2005] [Gómez-Tejedor et al. 2024] [Gördebil and Temirel 2025] [Hall et al. 1981] [Hall et al. 1991] [Hammack 1947] [Hanson 1945] [Hanson 1982] [Harrington 1951] [Harris 2017a] [Harrison et al. 2015] [Hartzell Performance Propeller Upgrade 2003] [Hasnaoui et al. 2024] [Havill 1934] [Hawks 1982] [He et al. 2019] [He et al. 2026a] [Heaton 2025] [Heidelberg and Woodward 1989] [Heinzen 2018] [Heinzen et al. 2010] [Hendricks 2011] [Hieke et al. 2025] [Hiller Aircraft Corp Palo Alto Ca 1956] [Hillman 1981] [Hiraki and Kai 2022] [Hiraki et al. 2019] [Hiremath et al. 2016] [Hnidka et al. 2020] [Hoehne and Hoffman 1961] [Hoff 1942] [Hongwei et al. 2024] [Hoover and Shen 2018b] [Hoover and Shen 2019a] [Hoover and Shen 2019b] [Hossain and Krouglicof 2010] [Hough 1961] [Hough and Ordway 1965] [Howard and Ulisnik 1965] [Hu et al. 2019] [Hu et al. 2024c] [Hua et al. 2025b] [Hughes and Gazzaniga 1989] [Humphrey et al. 2004] [Hunsaker and Snyder 2006] [Huo] [Huo et al. 2019] [Ibrahim 2003] [Iek et al. 1992] [Iek et al. 1993] [Influence of Propeller Characteristics 2015] [Ishaque et al. 2026a] [Ismail et al. 2024a] [Itoh and Satoh 2019] [Iyer 2026] [Jarzyna 1986] [Jeracki and Mitchell 1981] [Jiang 2003] [Jimenez and Singh 2015] [Johnson 1948] [Johnson and Yamauchi 1996] [Johnson et al. 1991] [Johnston and Sullivan 1990] [Johnston and Sullivan 1992] [Joshi et al. 2020] [Junaidin et al. 2026] [Jung et al. 2022] [Kapucu and Şimşek 2021] [Kasim et al. 2019] [Katz et al. 1982] [Kawamura 2021] [Kawanami 2010] [Kearns 1939] [Kearns 1941] [Kerwin 1961] [Kettleborough 1969] [Khalid] [Khan et al. 2018] [Khasyofi and Hartono 2019] [Kher et al. 2026] [Kim 2023] [Kinnas and Pyo 1997] [Kinney 2000] [Kinney 2001] [Kirby 1957] [Kirby 1960] [Kirby 1961] [Klesa 2014] [Koch 2025] [Koch and Koert 2023] [Koch and Koert 2024] [Kochersberger et al. 2000] [Kolar 2017] [Kolesar et al. 1970c] [Komizunai et al. 2020] [Konrad et al. 2017] [Konrad et al. 2026] [Koyama] [Kruger 1949] [Krynytzky 1988] [Kuantama and Tarca 2017] [Kucharski et al. 2026] [Kutty and Rajendran 2017] [Kwon et al. 2013] [Labonté 2025] [Laitone 2000] [Lampton 1938] [Lange and McLemore 1950] [Lapoint and Granlund 2024] [Lefevre et al. 2022b] [Lefevre et al. 2022a] [Lenfers 2012] [Leng et al. 2019c] [Hang et al. 2022] [Lepicovsky and Bell 1983] [Lerbs 1955] [Lesieutre and Sullivan 1986] [Level Flight Performance Flight 2003] [Lewis et al. 2023] [Li and Kwok 2024] [Li and Stefko 1984] [Li et al. 2022b] [Lieberman and Hoffman 1964] [Liu et al. 2019] [Liu et al. 2022a] [Liu et al. 2023c] [Liu et al. 2025d] [Lopez et al. 2017] [Louis and Louis 2020] [Loukakis and Politis 1981] [Lowry 1997] [Lowry 1999] [Luan et al. 2023] [Lush and Moakes 1959] [Lysenkov 2018] [Lytwyn and Young 1967] [Maasdorp et al. 2020] [Macey 1956] [MacNeill and Verstraete 2017] [Madureira and de Almeida 2026] [Makeev et al. 2021a] [Malick and Agarwal 2015] [Manca et al. 2023] [Manchin et al. 2019] [Margoulis 1922] [Marretta et al. 1999] [Intan et al. 2023] [Mautner and Gillcrist 1992] [McAndrew et al. 2018] [McBain 2019] [McCormick 1956b] [McHugh 1935] [McHugh 1939] [McHugh and Derring 1939] [McNay 1958] [Meheut 2013] [Mei and Zhou 2015] [Meneghetti Bomfim et al. 2024] [Meyerhoff and Zvengrowski 1962] [Mieloszyk et al. 2013a] [Mieloszyk et al. 2013b] [Milenković-Babić 2018] [Miley 1982] [Misztal 1933] [Mkoyan et al. 2023] [Moens and Gardarein 2001] [Ali et al. 2024b] [Molland and Turnock 2002] [Montagner 2026] [Morgan 1954] [Morgan 1961] [Mortimer et al. 2026] [Mueller et al. 1992] [Muhafiz and Rayhan 2026] [Mukund and Kumar 2016] [Munazid et al. 2023] [Munk 1922] [Munk 1924] [Murakami et al. 2019] [Muscarello and Quaranta 2019] [Muscarello and Quaranta 2023] [Muscarello and Quaranta 2024] [Muth and Peter 2015] [Naka and Kagami 2020] [Nakashima 1981] [Nakashima 1982] [Nallasamy and Groeneweg 1989] [Nallasamy and Groeneweg 1990] [Nangia and Palmer 2001] [Naoki et al. 2022] [Naoki et al. 2025] [Narbut 1975] [Nardone et al. 2014] [Nash and Laplante 2004] [National Advisory Committee 1936] [Nayak and Kumar 2023] [Nederlof et al. 2022] [Nelson 1964] [Nelson and Shen 2021] [Nelson and Shen 2022] [Nelson and Shen 2023] [New ATP Propeller Begins 1985] [Nguyen and Ngo 2017] [Niec and Roberts 2026] [Nimal and Venkatesan 2019] [Nishida 1983] [Nishii et al. 2021] [Nitzsche 1989a] [Nitzsche 1991] [Nitzsche 1994] [Nixon 1987] [No. 1 Propeller Company 2017] [Norris and Bauer 1993] [Norton 1956] [Bentrad et al. 2025] [Okawa et al. 2025] [Omur Icke and Baysal 2021] [Oppenheimer and Jacques 1951] [Orakzai et al. 2025] [Ordway and Greenberg 1961] [Ortolani et al. 2022] [Osovskii and Sharatov 2019] [Ostroukhov 2009] [Pahonie et al. 2018] [Panjwani et al. 2020] [Pantel] [Park and Sankar 1993] [Park et al. 2021] [Parker and Heltsley 1972] [Parlett et al. 2025] [Parlett et al. 2026] [Pasialakos 2024] [Pass 1941] [Patience and Nahon 2024] [Pelletier and Schetz 1985] [Von Hardenberg and Flack] [von Hardenberg et al. 2024] [von Hardenberg et al] [Pavel et al. 2018] [Pendley 1945] [Perisho 1959] [Petroff and Wattson 1954] [Pełczyński and Bajerlein 2025] [Pełczyński and Bajerlein 2026] [Pfeiffer 1988] [Piancastelli 2025] [Pitkin 1943] [Podsędkowski et al. 2020] [Podsędkowski et al. 2023] [Prabhu et al. 2021] [Prakash 2018] [Propeller basic theory 2026] [Propeller Design Tools 2018] [Propeller Design 2024] [Propeller Development 1981] [Propeller Effect over Air-Vehicle 2024] [Propeller Geometric Definition 2024] [Propeller History 2024] [Propeller Model 2026] [Propeller Performance 2012] [Propeller Performance 2022] [Propeller System for Bush 1999] [Propeller Theory 2003] [Proprietary Propeller De-Ice Product 2007] [Pu et al. 2022] [Putra et al. 2025] [Pyo 1995] [Quackenbush et al. 2011] [Ragni et al. 2011] [Rajagopalan 1989a] [Maki and Giulianetti 1966] [Recent Developments 1950] [Reed 1966] [Reis Rodrigues and Melo De Sousa 2022] [Report No. 340. Full 1930] [Report No. 481 Working 1934] [Reynolds et al. 1957] [Rhodes 1990] [Ristea et al. 2025] [Rizk 1988] [Roberts 1964] [Roberts and Yaggy 1950] [Robinson and Herrnstein 1937] [Rogallo et al. 1951] [Rogers 1957] [Romig 1912] [Roosenboom and Schröder 2010] [Rostami 2024] [Rostami et al. 2022] [Rouser et al. 2025] [Rubin and Zhao 2021] [Ruiz-Sanchez 2016] [Saari and Wallner 1946] [Sabzehparvar 2005] [Sajith Kumar et al. 2019] [Salters and Norton 1952] [Samarth Pathak 2025] [Sartwell and Legg 2004] [Savino and Zanotti 2025] [Schetz 1984] [Schmaus and Chopra 2015b] [Schmaus and Chopra 2015a] [Schmidt 1985] [Schroeder and Dai 2010] [Schöne 1988] [Seo et al. 2022] [Shah 2019] [Shankar et al. 2022] [Shao et al. 2025b] [Shimamoto et al. 2011] [Showers 1952] [Sihaan et al. 2022] [Sikora and Mendenhall 1974] [Silvestre et al. 2013] [Simmonds 1967b] [Simmonds 1967a] [Simmonds 1967c] [Simmons et al. 2023] [Sinacori and Lange 1961] [Singh et al. 2026] [Sinha 2025] [Sleeman 1953] [Sleeman and Byrnes 1953] [Sleeman and Morrison 1953] [Sluchak 1997] [Smedresman et al. 2011] [Smith 2005] [Smith et al. 2019] [Song and Kim 2018] [Stearns et al. 1956] [Stefko and Jeracki 1985] [Stephenson 1952] [Stickle et al. 1941] [Stokkermans and Veldhuis 2021] [Stokkermans et al. 2018] [Stokkermans et al. 2019b] [Stokkermans et al. 2021] [Strand and Levinsky 1969] [Strength of propeller 2026] [Stroub 1978] [Stuermer 2004] [Suk and Čerňan 2021] [Sullivan 1977] [Sullivan and Evans 2008] [Sunarto et al. 2022] [Sundar and Sullivan 1986] [Suranto et al. 2022] [Suwandito 2023] [Swanson 1943] [Sweberg 1942b] [Sweberg 1942a] [Szafran et al. 2014] [Sørensen and Filippone 2026] [Tachmindji 1956] [Takagi 1960] [Takagi 1961] [Takallu and Lessard 1991] [Takinaci and Atlar 2002] [Talbot et al. 1994] [Taniguchi and Oyama 2022] [Taylor 1935] [Taylor 1950] [Taylor 1958a] [Thamke et al. 2025] [Гевко and Зінченко 2018] [The Measurement of Propeller 1921] [“The Propeller That Took 2017] [Theodorsen 1960b] [Theodorsen 1960a] [Theodorsen and Nomicos 1961] [Thom and Duraisamy 2013] [Thompson 1978] [Tian and Kinnas 2012] [Traub 2016a] [Traub 2021] [Traum 2011] [Trenka 1966] [Turnbull 1931] [Uppoor and Chopra 2026] [Uppoor et al. 2025] [Use of Reinforced Plastics 1974] [Uyar et al. 2012] [UÇAr et al. 2025] [Valarezo and Hess 1986] [van Eck 2026] [Van Treuren and Wisniewski 2022] [Veldhuis and Luursema 2000] [Veldhuis et al. 2013] [Vijayanandh et al. 2022] [Vogeley 1951] [Vollo and Brassaw 1956] [Wachspress and Quackenbush 2008] [Wainauski 1968] [Wales et al. 2022] [Walz 1976] [Walz 1978] [Wan et al. 2023] [Wang 1969] [Wang and Chen 2015] [Wang and Li 2025] [Wang et al. 2019a] [Wang et al. 2020b] [Wang et al. 2023b] [Wang et al. 2025c] [Warwick 2021] [Watanabe et al. 2024] [Watts] [Watts and Biggers 1972] [Waugh 1947] [Webb and Willer 1952] [Weir 1986] [Weiss et al. 2013] [Wenhui and Kun 2023] [Westmoreland et al. 2008] [Westmoreland et al. 2014] [Widmayer and Tomassoni 1971] [Wieselsberger 1934] [Wild et al. 2025] [Windler 1937] [Witkowski et al. 1989] [Worobel and Peracchio 1968] [Wrench 1957] [Wright and Turnbull 1929] [Wróblewski et al. 2025a] [Wróblewski et al. 2025b] [Wu et al. 1972] [Wu et al. 2024c] [Xia et al. 2020] [Fei 2021] [Xie and Haberland 1999] [Xie et al. 2020b] [Xu et al. 2024a] [Yang et al. 2013] [Yangang et al. 2016] [Yassini 2007] [Yauwenas et al. 2022] [Yeremiyev et al. 2019] [Yildiz et al. 2023] [Yilmaz et al. 2015] [Yomchinda 2018] [Yu and Chen 1984] [Yu et al. 2021b] [Zabinsky 1956] [Zabinsky and Laszewski 1956] [Zabunov and Mardirossian 2018] [Zalewski 2015] [Zhang and Ma 2018] [Zhang et al. 2001] [Zhang et al. 2021c] [Zhang et al. 2022a] [Zhang et al. 2022b] [Zhang et al. 2023g] [Zhang et al. 2023c] [Zhang et al. 2025d] [Zhang et al. 2025a] [Zhao and Sheng 2015] [Zhao and Shkarayev 2019] [Zhao and Wang 2016] [Zhao et al. 2022a] [Zheng and Chopra 2025] [Zheng et al. 2016] [Zhenyu et al. 2018] [Zhou et al. 2026g] [Zosimovych 2022] [Öznalbant et al. 2016] [Özyurt and Akbıyık 2025]

Momentum theory, rotor aerodynamics and hover performance

The disc that holds the aircraft up. Momentum and actuator disc theory, induced velocity and inflow, rotor wakes, hover performance and the figure of merit, and the aerodynamics of rotors in forward flight. 41 titles name an actuator disc, the earliest dated one from 1964.

604 records. [Abras and Hariharan 2015] [Abras et al. 2019] [Abrego et al. 1999] [Acree et al. 1999] [Acree et al. 2001] [Actuator Disk 2013] [Additional Induced-Velocity Models 2024] [Aeroelastic Response Loads 1995] [Agarwal and Deese 1986] [Agarwal and Deese 1987] [Aguirre et al. 2023] [Ahmad and Biedron 2011] [Ahmad and Chaderjian 2011] [Ahmad et al. 2013] [Ahmed Snikdha and Chen 2023] [Albachten 1956] [Albang and Roberts 1974] [Allen 2006] [Allen 2007] [Allen and Jones 1998] [An and Kim 2026] [Anonymous 2025] [Arcidiacono 1964] [Arents 1977] [Army Aviation Board Fort Rucker Al 1968] [Asper and Sirohi 2024] [Atesoglu and Guzel 2013] [Axten and Johnson 2021] [Bachmaier and Anderson 2021] [Baculi et al. 2023] [Baeder and Khanna 1996] [Baeder et al. 2014] [Bagai and Leishman 1995a] [Bagai and Leishman 1995b] [Balcerak 1967] [Balch 1983] [Balch 1984] [Balch 1985] [Barakos and Jimenez-Garcia 2016] [Barakos et al. 2019] [Barbely and Komerath 2016] [Barbely et al. 2016] [Baron 1981] [Baron and Kleinman 1972] [Baron et al. 1964] [Bastankhah et al. 2026] [Bates et al. 1951] [Beaumier et al. 1996] [Benedict et al. 2013b] [Benedict et al. 2013a] [Simmons et al] [Berenger et al. 1996] [Bernhard and Chopra 1998] [Berry 1988] [Berry et al. 1987] [Bertelsen 2016] [Bettschart 1999] [Bhagwat 2011] [Bhagwat and Leishman 2000] [Bhagwat et al. 2006] [Bi et al. 1991] [Bielawa 1988] [Biezad 1994] [Binion 1971] [Blade Element Rotor BER 2026c] [Blade Element Rotor BER 2026e] [Blade Element Rotor BER 2026d] [Blade Element Rotor BER 2026a] [Blade Element Rotor BER 2026b] [Blade Element Rotor Overview 2026] [Blade-Element/Momentum Theory 2024] [Boatwright and Clingan 1969] [Boeing Vertol Co Philadelphia Pa 1977c] [Boeing Vertol Co Philadelphia Pa 1977b] [Boniface et al. 1995] [Bouchet and Rahier 2000] [Bowden and Shockey 1970] [Bramwell et al. 2000a] [Bramwell et al. 2000b] [Brand et al. 1986] [Brand et al. 1990] [Branum and Tung 1990] [Briassulis and Andreopoulos 1991] [Briassulis and Andreopoulos 1993] [Brown 1965] [Brown and Fischer 1967] [Brown and Fisher 1968] [Buchtala et al. 2000] [Buffum and Robertson 1966] [Burley et al. 2002] [Burley et al. 2003] [Burpo and Darlington 1965] [Calcaterra and Schubert 1969] [Cameron and Sirohi 2019] [Cao et al. 2025] [Caprace et al. 2022] [Carlson and Cassarino 1973] [Carlson and Hilzinger 1965] [Carpenter and Hodgkinson 1981] [Carpenter and Paulnock 1949] [Carpenter and Paulnock 1950] [Cassarino 1970] [Celi 1991] [Celi and Friedmann 1988] [Cell 1992] [Celniker et al. 1964] [Chaimovich et al. 1992] [Chang and Cesnik 2025] [Chapter 14. Control 1994] [Charles and Hassan 1988] [Chattopadhyay et al. 1997] [Chattot 2014] [Chattot 2020] [Chen and Guo 2025] [Chen and Hubner 2021] [Chen et al. 1987] [Chen et al. 2019c] [Chen et al. 2019d] [Chen et al. 2022] [Choephel and Maughmer 2014] [Choi et al. 2022] [Chopra and Prahlad 2002] [Chopra and Smith 1992] [Clark 1985] [Coffen et al. 1991] [Conlisk 1999] [Conway 2003] [Cook 1974] [Cornelius and Schmitz 2024] [Cox-Gross and Collins 2025] [Crespo da Silva 1991] [Crim 1959] [Crimi 1965] [Crispin 1982] [Crouse and Leishman 1993] [Csencsitz et al. 1973] [Cui et al. 2023] [Curtis et al. 2007] [Curtiss 1976] [Dai et al. 2025b] [Dalang-Secretan and Ballin 1990] [Damen et al. 2016] [Darabi and Wygnanski 2003] [Davis and Chang 1986] [Davis et al. 1961] [Dawson 1982] [Dayhoum et al. 2020] [De Santis and Schwering 1975] [Deal et al. 1967b] [DeBenedictis and Woestman 1973] [Delgado and Datta 2024] [Delgado and Datta 2025] [Delgado and Datta 2026] [Delgado et al. 2026] [Desopper 1985] [Dick et al. 2019] [Dietz et al. 2007] [Dooley 1976] [Dreyfus and Pellman 1978] [Drinkwater et al. 1965] [DuWaldt and Piziali 1963] [Dyke 1963] [Edwards and Miao 1977] [Egolf and Landgrebe 1984] [Egolf et al. 2000] [Ellenrieder and Brinson 1998] [Engblom and Ochoa 1988] [Equations of Motion 2002] [Erhard and Alonso 2024b] [Erhard and Alonso 2024a] [Eshcol et al. 2018] [Eshow 1990] [Eshow 1992] [Etemadi] [Euler/Navier-Stokes Computations 1990] [Nitzsche 2001] [Fei and Peters 2012] [Fei and Peters 2013] [Fejtek 1993] [Fejtek and Roberts 1989] [Fejtek and Roberts 1991] [Fejtek and Roberts 1992b] [Felker 1993] [Felker and Light 1986b] [Felker and Light 1986a] [Felker et al. 1985] [Felker et al. 1988] [Ferguson and Dreier 2005] [Fletcher and Brown 2010] [Ford 1989] [Fortin and Ahuja 2024a] [Fourie and Jones 2015] [Free-Wake Computation of Helicopter 1993] [Friedmann and Shanthakumaran 1983b] [Friedmann and Shanthakumaran 1983a] [Fries 2000] [Funk and Komerath 1995] [Funk et al. 1993] [Gaffey and Maisel 1974] [Gahlot and Sankar 2024] [Gamme et al. 2017] [Ganguli 2002] [Ganti and Baeder 2012] [Gao et al. 2022] [Garcia-Duffy et al. 2009] [Garg and Schmidt 1989] [Garren et al. 1965] [Gennaretti et al. 2010] [Gerdes and Rolls 1969] [Gerhold and Buchholz 2002] [Stich et al] [Ghee and Elliott 1992] [Ghoreishi and Vermeire 2023] [Giles 1987] [Giles 1988] [Gillespie and Carter 2026] [Givens 1965] [Glaz et al. 2006] [Goorjian 1972] [Gray 1956] [Gray et al. 1953] [Greenberg 1972] [Griffin 1975] [Gupta and Baeder 2002] [Gupta and Loewy 1973] [Guruswamy 2010] [Gustafson and Calapodas 1976] [Guzel and Atesoglu 2014] [Dabaghian et al. 2025] [Hah and Lakshminarayana 1980] [Ham and Madden 1965] [Hammond 1966] [Han 2005a] [Harada et al. 2012] [Hariharan 2020] [Hariharan and Sankar 2000] [Hariharan et al. 2014] [Hariharan et al. 2017] [Harris 1961] [Harris 1987] [Harris 1999] [Harvey et al. 2024] [He and Zhao 2008] [He et al. 2025a] [Heimerl and Benedict 2022] [Heimerl et al. 2021] [Heintz et al. 2024] [Heiser 1972] [Hejranfar and Moghadam 2011] [Hermes and Wood 1969] [Heyson 1958] [Heyson 1980a] [Heyson 1980b] [Ho and Yeo 2016] [Hoad 1991] [Hodges and Ormiston 1973] [Hodges and Ormiston 1976] [Hodges et al. 1988] [Hohenemser and Crews 1972] [Hoskin et al. 1991] [Hough and Ordway 1964] [Hur et al. 2019] [Ickes et al. 2014] [Vigouroux et al. 2013] [Jacobsen and Greif 1972] [Jacobson et al. 2016] [Jain 2015] [Jain 2016] [Jain 2018] [Jain 2024] [Jain and Conlisk 2000] [Jain and Potsdam 2014] [Cornelius and Schmitz] [Cornelius] [Jayaraman and Potsdam 2016] [Jeon and Lee 2000] [Ji et al. 2026] [Jiang and Zhang 2018] [Jiao et al. 2018] [Jimenez Garcia and Barakos 2015] [Jimenez-Garcia and Barakos 2017] [Jimenez-Garcia et al. 2017] [Johnson 1976] [Johnson 2001b] [Johnson and Barakos 2011] [Johnston and Fleeter 1995] [Jones 1965] [Jung et al. 2014] [Kamman and Hall 1978] [Kaul and Ahmad 2011] [Kawachi 1981] [Kellen and Benedict 2018] [Kelly and Jemcov 2019] [Khader and Dhaher 1998] [Khier] [Kim 2004] [Kim and Komerath 1993] [Kim and Komerath 1995] [Kim et al. 2001] [Kim et al. 2002] [Kim et al. 2011a] [Kirby 1954a] [Kisielowski et al. 1967] [Klaren 1978] [Klimchenko et al. 2017] [Klimchenko et al. 2023] [Klingloff et al. 1965] [Ko and Lee 2023] [Komerath and Wong 2001] [Komerath et al. 1985b] [Komerath et al. 1988] [Komerath et al. 1998] [Komerath et al. 2009] [Komerath et al. 2015] [Kominer and Rosen 2013] [Konstantinov et al. 2021] [Korkan and Cross 1984] [Kottapalli 1998] [Kottapalli and Acree 2019] [Kozapalli and Warmbrodt 1997] [Kraft 1974] [Kreshock et al. 2025] [Kurtulus and Yenipazar 2024] [Kwon and Hodges 1989] [Lai and Le Tri 2017] [Lakshmikantham and Aravamudan 1973] [Lakshmikantham and Rao 1972] [Lakshminarayan et al. 2006] [Lakshminarayana 1976] [Landgrebe 1969] [Landgrebe 1971] [Landgrebe 1972] [Landi and Caccetta 2025] [Lee 1984] [Lee and Baeder 2004] [Lee and Kim 1993] [Lee et al. 2017] [Lee et al. 2021] [Lehman 1968] [Lei and Wang 2020] [Lei and Ye 2020] [Lei et al. 2020] [Lei et al. 2021] [Lei et al. 2023] [Leishman and Bagai 1991] [Leishman and Bagai 1996] [Lemont and Upton 1978] [Li et al. 2023b] [Light et al. 1994] [Lim and Moerder 2007b] [Lim et al. 2026] [Liou et al. 1988] [Liou et al. 1990] [Liu 1962] [Liu and Wang 2024] [Liu et al. 1983] [Liu et al. 2026c] [Livingston 1965] [Loeffler and Vanderbilt 1978] [Loenbaek et al. 2020] [Lohar 2000] [Lovas 2026] [Lovell et al. 1951] [Luo et al. 2026] [Magee and Alexander 1973] [Magier and Fellouah 2025] [Mahalingam and Komerath 1998b] [Mahalingam and Komerath 1998a] [Maisel and Harris 1981] [Makeev 2026b] [Makeev 2026c] [Manwaring and Fleeter 1988] [Margason 1970] [Marpu et al. 2014] [Martin et al. 1999] [Mathur] [Mathur and Rajagopalan 1991] [Wilbur et al. 2000] [Mavris et al. 1989] [McAlister 1996] [McCroskey et al. 1983] [McCroskey et al. 1985] [McDaniel et al. 1983] [McElreath et al. 2020] [McHugh and Taylor 1976] [McVeigh et al. 1983] [Meakin 1995] [Mihaila et al. 2026] [Miller 1962] [Miller 1964] [Miller 1982] [Min and Wake 2015] [Min and Wake 2018] [Mistry and Gandhi 2012] [Mittal 2005] [Mobley et al. 2021] [Modarres and Peters 2013] [Modarres and Peters 2015] [Momentum Theory 2024] [Moore et al. 2022] [Morduchow et al. 1953] [Morris et al] [Mortimer and Sirohi 2024] [Moushegian 2024] [Mueller et al. 2009] [Murata et al. 2025b] [Murata et al. 2025a] [Nagabhushanam et al. 1997] [Narducci 2017] [Nargi et al. 2018] [Naumowicz and Smith 1992] [Nayak et al. 2026] [Nguyen et al. 2022] [Nikolaev and Nikolaeva 2020] [Zawodny et al] [Nikolsky 1959] [Garcia et al. 2026] [Oates 1972] [Ockier and Celi 1991] [Olivares-Espinosa et al. 2014] [Olson 1992] [Olson and Rumberger 1991] [Oo] [Osa et al. 2014] [Osa et al. 2016] [Osa et al. 2017] [Osman et al. 2026] [Paglino 1971] [Panayotov et al. 2020] [Papachristos et al. 2013] [Park and Kwon 2022] [Peters et al. 1989] [Peters et al. 2014] [Phelps 2014] [Pieper] [Pieper et al] [Pieper et al. 1996] [Piziali 1966] [Piziali and Duwaldt 1962] [Platzer et al. 2016] [Pomin and Wagner 2001] [Pomin and Wagner 2002] [Position Estimation for Autonomous 2014] [Potsdam and Strawn 2002] [Povarov 2021] [Prach et al. 2016] [Prasad et al. 2011] [Proulx-Cabana et al. 2022] [Proulx-Cabana et al. 2024] [Prouty 1975a] [Prouty 1975b] [Pruyn et al. 1966] [Qiu 2025] [Quackenbush 1987] [Quackenbush et al. 2019] [Quaranta] [Quinto and Paulson 1983] [Rajagopalan 1988] [Rajagopalan 1989b] [Rajendiran Vijayaraj et al. 2024] [Ramachandran and Tung 1992] [Ramachandran et al. 1989] [Ramasamy 2013] [Ramasamy and Leishman 2006] [Ramasamy et al. 2010] [Rinehart 1970c] [Ringland et al. 1971] [Rodriguez et al. 2021] [Rogers 1996] [Rosen and Gur 2008] [Rossow 1985] [Rotaru et al. 2016] [Rotary Wing Aerodynamics 2022] [Rotor Aerodynamics in Forward 2011] [Rotor in Vertical Flight 2011] [Saberi et al. 2026] [Saetti 2024] [Sagaga and Lee 2020] [Samad et al. 2025] [Sankar and Komerath 1988] [Sankar et al. 1995] [Sankar et al. 2015] [Schlechtriem and Ballmann 1994] [Schmidt 1987] [Schroeder et al. 1994] [Schwartz and Rogers 1992] [Schweikhard 2007] [Scully 1967] [Segel 1965] [Seher-Weiß and Jones 2021] [Sengupta et al. 2025] [Shahjahan and Ahuja 2026] [Shahmiri 2017] [Shaidakov and Brusov 2017] [Shamie and Friedmann 1976] [Shang and Hodges 1995] [Shankar et al. 2025] [Sharon 1975] [Shaw and Qin 1999] [Sheng and Zhao 2026] [Sheng et al. 2014] [Sheng et al. 2015] [Sheng et al. 2016] [Shipman 1974] [Shipman and Wood 1970] [Shulman 1956] [Sicard and Sirohi 2010] [Sieradzki 2018] [Silwal and Raghav 2020] [Simmons and Ackerman 2026] [Singh et al. 2019] [Sivaneri and Kawiecki 1989] [Smith and Betzina 1986] [Smith and Chopra 1993] [Smith and Sankar 1991] [Smith et al. 1951] [Son and Kim 2023] [Spalart 2003] [Spalart 2004] [Spinner et al. 2020] [Srinivasan and McCroskey 1987] [Stahl et al. 2018] [Stalker et al. 2004] [Stammers 1970] [Stauffer et al. 1990] [Wright] [Stepniewski 1979] [Stepniewski and Keys 1984] [Stewart et al. 1983] [Stockman et al. 1973] [Stoddard and Scully 1969] [Stratton and Landman 2021] [Stratton et al. 2023] [Sutherland et al. 2024] [Swanson 1993] [Tai and Runyan 1984] [Tai and Vorwald 1993] [Takahashi and Friedman 1988] [Tapscott 1960d] [Tapscott 1960a] [Throneberry et al. 2021a] [Throneberry et al. 2021b] [Throneberry et al. 2022] [Tischler et al. 1985a] [Tischler et al. 1996] [Tosti et al. 1954] [Totah and Patterson 1988] [Tracy and Chopra 1993] [Tracy and Chopra 1996] [Tsoubanos 1975] [Tsujimoto and Murata 1978] [Tung and Lim 2005] [Tyler et al. 2026] [Upton and Young 1965] [Valdez and Tinney 2022a] [Valdez and Tinney 2022b] [van der Vegt 1983] [van der Wall 2011] [van der Wall et al. 2015] [van Kuik 2016] [van Kuik 2017] [Vasilescu 2006] [Villeneuve et al. 2021] [Wachtell 1970] [Wadcock et al. 2011] [Wake et al. 1985] [Wall et al. 1973] [Wallis 1961] [Walsh 1991] [Wardwell and Hange 1993] [Webster et al. 1995] [Weller and Warmbrodt 1983] [Wenren and Steinhoff 2009] [Wheatley 1935] [Wie et al. 2009] [Wilkerson 1983] [Winston et al. 1975] [Wohllebe and Migdal 1979] [Wong et al. 2005] [Wu and Goorjian 1972] [Wu and Sigman 1975] [Xu et al. 2005] [Yamaguchi 2026] [Yamauchi and Wadcock 1998] [Yang and Zhuang 2000] [Yang et al. 2012] [Yang et al. 2023a] [Yemenici et al. 2010] [Yoo et al. 2010] [Yoshida et al. 2021] [Yuan and Friedmann 1994] [Yuan et al. 1994] [Zerle et al. 1997] [Zhang et al. 2019a] [Zhang et al. 2026c] [Zhao 2018] [Zhao and He 2016] [Zhao and Sheng 2021] [Zhao and Sheng 2022] [Zhao and Sheng 2024] [Zhao et al. 2019] [Zhao et al. 2021] [Zhe Jiang et al] [Zhou et al. 2022c]

Noise of propellers and lifting rotors

The constraint the X-18 never faced. Propeller and rotor noise, blade-vortex interaction, powered-lift and flap noise, community noise, annoyance and psychoacoustics. The noise literature is an urban air mobility literature. 152 of these titles name urban air mobility or an electric vertical take-off aircraft, and 140 of the 142 dated ones are from 2019 or later.

508 records. [A Computational Study 1993] [Moshkov et al. 2018] [Aalmoes and Sieben 2021] [Aalmoes et al. 2025] [Abergo et al. 2025a] [Abergo et al. 2025b] [Aerodynamics and Acoustics 1993] [Systems et al. 2025] [Afshari and Karimian 2024] [Ahmed 1996] [Aihara et al. 2020] [Akiwate and Parry 2023] [Akkermans et al. 2014] [Allen and Korkan 1991] [Alvarez et al. 2020] [Amargianitakis et al. 2026] [Ananthan et al. 2020] [Anderson et al. 2026] [Araghizadeh et al. 2024] [Araghizadeh et al. 2025] [Arndt and Borgman 1970] [Arndt and Borgman 1971] [Badea and Crunteanu 2026] [Baerens 2024] [Bai and Li 2024] [Bain et al. 2026] [Baker and Manhardt 1977] [Bao et al. 2023] [Barakos 2024] [Barbarino et al. 2022] [Barton 1975] [Baskaran et al. 2023] [Bauer 2021] [Bauer 2023a] [Baumeister and Eversman 1986] [Bausch et al. 1971] [Becker and Maus 1977] [Bensignor et al. 2026] [Bergmann et al. 2022] [Bergmann et al. 2024a] [Bergmann et al. 2024b] [Bergmann et al. 2025] [Bernardini et al. 2014b] [Betzina et al. 2000] [Beyer et al. 1984] [Bezuidenhout et al. 2026a] [Bezuidenhout et al. 2026b] [Bhat and Gall 1975] [Blandeau and Joseph 2010] [Blandeau et al. 2009] [Block et al. 1986] [Blumrich et al. 2016] [Boelens et al. 2000] [Borchers 2009] [Botre et al. 2023] [Boucher et al. 2023] [Boujo et al. 2025] [Boussard et al. 2022] [Boyd et al. 2004] [Bricker et al. 2026] [Brieger et al. 1987] [Brooks and Burley 2004] [Brown and Farassat 1976] [Brown et al. 2026] [Brungart 2021] [Caillet et al. 2025] [Caillet et al. 2026] [Campos 1999] [Campos and Lau 2006] [Casagrande Hirono et al. 2022] [Casagrande Hirono et al. 2023] [Casalino and Barbarino 2011] [Casalino and Barbarino 2012] [Castelucci] [Chaitanya et al. 2025] [Chen et al. 2026d] [Chen et al. 2026a] [Cho et al. 2024] [Chow and Bowen 2024] [Chyla 2024] [Clark et al. 1973] [Clarke and Alonso 2021] [Clarke and Botero 2023] [Clarke et al. 2025] [Coffen 1992] [Coffen and George 1993] [Cole and England 1967] [Stutz et al. 2026] [Combey et al. 2026b] [Combey et al. 2026a] [Comparative Acoustic Wind-Tunnel Measurements 1981] [Connor and Martin 1987] [Czech et al. 2026] [Boyd] [Delattre et al. 2016] [Deming 1940] [Boyle et al. 2021] [Di Verniere et al. 2026] [Diehl et al. 2026] [Dierke et al. 2012] [Dittmar 1989] [Doherty and Butzel 1979b] [Duong] [Begault] [Durbin and Groeneweg 1982] [Edwards et al. 2001] [Effect of Forward Speed 1976] [Eißfeldt 2019] [Eißfeldt 2020] [Envia 1991] [Envia 2014] [Eversman 1989] [Fajinmi 2025] [Falck et al. 2018] [Falissard and Delattre 2014] [Farazi and Zou 2024] [Farvolden et al. 2024] [Feng 2026] [Feng et al. 2026b] [Flap Noise Prediction Method 1975] [Fletcher et al. 2009] [Simon et al] [Frota et al. 1998] [Fulton and Gandhi 2026] [Gaeta and Young 2010] [Gallman et al. 1995] [Gandhi et al. 2022] [Gandhi et al. 2026] [Gao et al. 2026] [Gasaway 1969] [Gasaway 1970] [Gautam et al. 2025] [Gennaretti et al. 2023] [George 1978] [George 1996] [George and Polak 1994] [George et al. 1989] [George et al. 1992] [Georgiou et al. 2026] [Gervais 2001] [Gervais and Schmitz 2002] [Gervais and Schmitz 2003] [Gervais and Schmitz 2004] [Gill and Lee 2024] [Gill and Lee 2025] [Glegg and Devenport 2024] [Glinka 2000] [Gnemmi et al. 1991] [Go et al. 2026] [Goldschmidt and Ukeiley 2023] [Goldschmidt and Ukeiley 2025] [Goldschmidt et al. 2026] [Golub et al. 1990] [Gonzalez et al. 2026a] [Goudswaard et al. 2024] [Goyal et al. 2021] [Goyal et al. 2024] [Goyal et al. 2025] [De Gregorio et al. 2024] [Groeneweg 1990] [Gruschka 1972] [Guerrero et al. 2025] [Guerrero et al. 2026a] [Guerrero et al. 2026b] [Gur et al. 2021] [Guérin et al. 2023] [Santos et al. 2025b] [Hakansson et al. 2025] [Halwes 1970] [Ham 2024] [Hambrey] [Han et al. 2008] [Hanson 1986] [Hanson 1995] [Hanson et al. 2022] [Hanson et al. 2023] [He et al. 2021] [Heidelberg and Woodward 1987] [Heller and Splettstoesser 1983] [Highly Noise-Suppressed Bypass 6 1975] [Hilton et al. 1960] [Hinterkeuser 1968] [Ho and Yeo 2017] [Hoad et al. 1992] [Homans et al. 1978] [Horne and Burnside 2013] [Tech et al. 2025] [Hubbard et al. 1972] [Hummel et al. 2026] [Hur et al. 2023] [Huston et al. 1989] [Hybrid Dynamic Mesh Redistribution 2022] [Iannotta et al. 2024] [Jadidi et al. 2026] [Jardin et al. 2023] [Jayaraman et al. 2012] [Jente et al. 2017] [Jente et al. 2018] [Jente et al. 2024] [Jeong et al. 2021] [Jeong et al. 2023] [Jia and Lee 2019] [Jia and Lee 2020] [Jia and Lee 2021a] [Jia and Lee 2021b] [Jia and Li 2025] [Li et al] [Li et al. 2021d] [Li et al. 2021b] [Johnson 1973] [Johnson 1974] [Johnson 2001a] [Josephson 2020] [Jung et al. 2025] [Kallergis 2024] [Kanjere et al. 2012] [Kekus-Kumor and Sieradzki 2023] [Kekus-Kumor and Sieradzki 2025] [Li and Lee 2021] [Kim 2022] [Kim and Lee 2024] [Kingan 2024] [Kingan and Parry 2019] [Kingan and Parry 2020b] [Kingan and Parry 2020a] [Kipersztok and Sengupta 1981] [Kitaplioglu 1986] [Kitaplioglu and Kinney 1986] [Kitaplioglu et al. 2000] [Ko et al. 2024b] [Ko et al. 2026] [Koch et al. 2022] [Koehler et al. 2021] [Konzel et al. 2023] [Kopyt and Ogrodnik 2026] [Kottapalli and Kitaplioglu 2000] [Kotwicz Herniczek] [Krejsa 1990] [Krishnamurthy and Rizzi 2022] [Kuntz 1996] [Kyi and Feng 2026] [Pascioni et al] [Lade and Guérin 2026] [Lattari et al. 2023] [Weist et al. 2026] [Lawrence and Self 2015] [Le Bras et al. 2024] [Lee and Baeder 2003] [Lee and Haan 2025] [Lee and Lee 2019] [Lee and Lee 2023] [Lee and Mosher 1979] [Lee and Shlesinger 2020] [Lee et al. 2024b] [Lee et al. 2025d] [Lee et al. 2026c] [Li 2023] [Li and Lee 2024] [Li and Liu 2026] [Li et al. 2021c] [Li et al. 2021a] [Li et al. 2022d] [Li et al. 2023a] [Li et al. 2024b] [Li et al. 2026e] [Lieser et al. 1994] [Light Aircraft Propeller 1993] [Lim et al. 2003] [Lima Pereira et al. 2024] [Little et al. 2022] [Liu 2011] [Liu and Wang 2026] [Liu et al. 2025b] [Liu et al. 2026a] [Livebardon et al. 2016] [Loeffler et al. 1980] [Lohmann 1981] [Lotinga et al. 2025] [Lowson 1972] [Ma et al. 2020] [Ma et al. 2022c] [Macaluso 1971] [Mahan and Fuller 1986] [Maita et al. 1990] [Groom et al] [Malpica et al. 2016] [Mani 1990] [Manoha et al. 2018] [Marinus et al. 2009] [Marinus et al. 2010] [Betzina and Nguyen 2003] [Marino 2010] [Marques et al. 2025] [Marques et al. 2026] [Marques Goncalves et al. 2024] [Marques Goncalves et al. 2025] [Martin et al. 1990] [Casanova et al. 2025] [McKay et al. 2021] [Menger et al. 1983] [Mengle 2011] [Modini et al. 2014] [Radotich] [Miranda and Lee 2023] [Moreau et al. 2024] [Morhy Cavalcante et al. 2026] [Moroianu and Fuchs 2005] [Mosher and Light 1994] [Moshkov and Yakovlev 2023] [Muench] [Mukherjee et al. 2022] [Musser et al. 2023] [Nallasamy et al. 1988] [Nallasamy et al. 1989] [Naseer et al. 2026a] [Naseer et al. 2026d] [Naseer et al. 2026b] [Naseer et al. 2026c] [Nelson and Franklin 2021] [Ng 2022] [Zawodny et al. 2025] [Zawodny et al. 2023] [Nixon 2023] [Noise Reduction through Circulation 2006] [Oh et al. 2026a] [Okoronkwo et al. 2024] [Okoronkwo et al. 2025] [Okoronkwo et al. 2026a] [Oleson and Patrick 1998] [Page et al. 2021] [Page et al. 2026] [Panel Discussion 1975] [Panel Discussion 1976] [Park 2026b] [Park et al. 2026b] [Parry and Kingan 2019] [Parry and Kingan 2020] [Paruchuri et al. 2023] [Parzych and Shattuck 1986] [Pascioni et al. 2024] [Pascioni et al. 2026] [Paswan et al. 2025] [Patrick and Nagel 1989] [Pegg 1970] [Pegg et al. 1977] [Peng] [Pereira et al. 2025b] [Pereira et al. 2025a] [Perennes and Roger 1998] [Perusek 1994] [Pettingill et al. 2021] [Pla et al. 1989] [Plunkett et al. 1984] [Podsedkowski et al. 2022] [Polak and George 1998] [Pope et al. 1987] [Posa 2023] [Powered-Lift Aerodynamics and Acoustics 1976] [Preis et al. 2025] [Prichard 2000] [Propeller Acoustics 2024] [Propulsive-Lift Noise 1976] [Qi et al. 2024a] [Quackenbush and Wachspress 2006] [Rahier and Delrieux 1997] [Raza and Stansbury 2025] [Reddy 1975] [Rimjha et al. 2021] [Rinaldi et al. 2026] [Rinehart 1970a] [Rinehart 1970b] [Rizzi 2020b] [Rizzi and Rafaelof 2021] [Rizzi and Scata 2022] [Rizzi et al. 2022] [Rizzi et al. 2024] [Rizzi et al. 2026a] [Rizzi et al. 2026b] [Robison and Peake 2010] [Roiati et al. 2024] [Romani et al. 2022] [Rotor Noise 1976] [Rozman and Grace 2025] [Runyan 1980] [Runyan 1982] [Saetti and Buğday 2023] [Schaefer 1986] [Scheiman and Hoad 1977] [Schlegel and Bausch 1970] [Schlegel et al. 1966] [Schlinker and Amiet 1983] [Schmitz 1995] [Schmitz and Stepniewski 1971] [Schmitz and Stepniewski 1973] [Schmähl et al. 2021] [Schoenster et al. 1976] [Schram and Roger 2025] [Shao et al. 2026] [Shapiro and Healy 1968] [Shenoy 1989] [Shivashankara et al. 1990] [Chen et al. 2017] [Krishnamurthy] [Simon et al. 2023] [Smith et al. 2021] [Smith et al. 2024] [Son et al. 2025] [Soni et al. 2023] [Sorensen et al. 2026] [Sorokin et al. 2019] [Sowers 1965] [Spencer et al. 1996] [Splettstoesser et al. 1987] [Sree and Stephens 2014] [Stalnov et al. 2022] [Rizzi] [Rizzi 2020a] [Rizzi and Scata] [Rizzi et al] [Rizzi] [Rizzi] [Rizzi et al. 2023] [Sternfeld and Hinterkeuser 1970] [Sticchi et al. 2026] [Stone and Gutierrez 1972] [Strawn and Biswas 1995] [Stuermer and Akkermans 2014] [Sun et al. 2024c] [Sun et al. 2025] [Surriani et al. 2022] [Takeyeldein 2026b] [Tan et al. 2023a] [Tani et al. 2014] [Tejnil and Zhang 2018] [Aviation et al. 2025] [Федорович et al. 2021] [Tinney and Sirohi 2018] [Tinney and Valdez 2024] [Tinney and Valdez 2025] [Tinney and Valdez 2026] [Tinney et al. 2025] [Tinney et al. 2026] [Tokarev and Makarenko 2021] [Tonannavar and Garg 2026] [Torija et al. 2021] [Tracy et al. 2024] [Trembois et al. 2024] [Unruh 1987b] [Unruh 1988b] [Valente et al. 2023] [Van Treuren and Wisniewski 2019] [Van Treuren et al. 2018] [Vascik and Hansman 2018] [Vaughn and Christian 2024a] [Vaughn and Christian 2024b] [Vella et al. 2026] [Vieira et al. 2026] [Voropayev et al. 2025] [Voropayev et al. 2026a] [Voropayev et al. 2026b] [Bauer 2025] [Walker and Cuppoletti 2022] [Wall et al. 2017] [Wang et al. 2016a] [Wang et al. 2025k] [Wang et al. 2025n] [Wang et al. 2025h] [Wei et al. 2026b] [Weir et al. 1995] [Weitsman and Greenwood 2021] [Wickersheim et al. 2025] [Willis et al. 1977] [Willshire and Martin 1984] [Wisniewski 2021] [Wisniewski and Van Treuren 2022] [Wisniewski et al. 2025] [Wong] [Woodward 1987] [Woodward 1990] [Woodward 1992] [Woodward and Gordon 1988] [Woodward and Hughes 1989] [Wright 1969] [Wróblewski et al. 2026] [Wu et al. 2023a] [Yang et al. 2022c] [Yang et al. 2023b] [Yang et al. 2024a] [Yang et al. 2026c] [Yang et al. 2026d] [Ye et al. 2024] [Yin 2019] [Yokokawa et al. 2009] [Yu 1996] [Yu et al. 2020] [Yuan et al. 2024a] [Yuen 2026] [Yunus et al. 2023] [Yunus et al. 2024] [Zawodny et al. 2018] [Zeitvogel and Wisniewski 2022] [Zeng et al. 2026] [Zeng et al. 2027] [Zha et al. 2019] [Zhao et al. 2026c] [Zhong et al. 2021] [Zheng and Zhao 2015] [Zheng et al. 2018]

Propeller slipstream and wing interaction

The keystone’s own literature. The propeller slipstream and its effect on the wing, propeller and wing interference in tractor, pusher, wingtip and over-the-wing positions, deflected slipstream and blown wings. The vocabulary moved from the slipstream to the interaction. 194 titles name a slipstream, with a median year of 2003, while 127 name the propeller and the wing together as a propeller-wing or wing-propeller system, with a median year of 2023.

448 records. [Acevedo Giraldo] [Поваров and Зінченко 2019] [Agostinelli et al. 2015] [Ahamed et al. 2026] [Ahmed and Raghav 2024] [Ahmed et al. 2025b] [Ahuja and Litherland 2023] [Akiwate et al. 2022] [Alba et al. 2017] [Alba et al. 2018] [Alesin et al. 2020b] [Ali et al. 2025] [Aminaei et al. 2018] [Ananda et al. 2018] [Ananda Krishnan et al. 2013] [Aref et al. 2018] [Arnhem et al. 2019] [Arumugam and Chidambaram 2025] [Avallone et al. 2018] [Barker et al. 2023] [Beck et al. 2014] [Beck et al. 2015] [Beckers et al. 2026] [Belák and Hromčík 2023a] [Bencze et al. 1978] [Biber 2005a] [Biber 2011] [Biermann and Hartman 1942] [Bohari et al. 2018] [Bohari et al. 2019] [Bolster 1937] [Boots] [Borer and Moore 2015] [Bouquet and Vos 2017] [Litherland et al] [Brenckmann 1958] [Brown and Chopra 2024] [Brown et al. 2024] [Brown et al. 2025] [Burgers 1995] [Butler et al. 1966] [Böhnisch et al. 2024a] [Böhnisch et al. 2024b] [Bölk et al. 2021] [Cai et al. 2025] [Cao et al. 2023] [Cao et al. 2024] [Cao et al. 2026b] [Catalano 2004] [Catalano and Stollery 1993] [Chadha et al. 2016] [Chandukrishna and Venkatesh 2023] [Chang et al. 2022] [Chao and Zhenghong 2019] [Chapman 1945] [Chauhan 2025] [Chauhan and Martins 2020a] [Chauhan and Martins 2021] [Chen and Hubner 2020] [Chen and Wang 2019] [Chen and Yang 2022] [Chen et al. 2015] [Chen et al. 2016] [Chen et al. 2019b] [Chen et al. 2023c] [Chen et al. 2023d] [Chen et al. 2026b] [Chen et al. 2026c] [Chinwicharnam and Thipyopas 2016] [Chinwicharnam et al. 2015] [Chiocchia and Pignataro 1995] [Cho and Cho 1999] [Cho and Williams 1990] [Clarke et al. 2021] [Clements and Rais-Rohani 2000] [Cole and Jordan 1952] [Cole et al. 2017] [Cole et al. 2019] [Colella et al. 2012] [Colli et al. 2026] [Comunian et al. 2026] [Conway 1998] [Crouse and Leishman 1992] [Cui et al. 2019] [Czinczenheim 1977] [D’Angelo et al. 2022] [Dallas and Irvin 1956] [de Vries and Vos 2022] [de Vries et al. 2019b] [de Vries et al. 2019a] [Deckert et al. 1968b] [Delany 1949] [Derda et al. 2026] [Ding et al. 2026b] [Drinkwater and Vomaske 1966] [Duan et al. 2012] [Duivenvoorden et al. 2022] [Duivenvoorden et al. 2025] [Duivenvoorden et al. 2026] [Qin et al. 1998] [Ellis 1966] [Elsaadawy and Britcher 2000] [Elsaadawy and Britcher 2002a] [Elsaadawy and Britcher 2002b] [Elsaadawy and Britcher 2003] [Elsaadawy and Britcher 2004] [Empey and Nahon 2022] [Exalto et al. 2024] [Falarski and Mort 1971] [Favier et al. 1991] [Faye et al. 1987] [Fei 2019] [Ferrari 1937] [Ferraro et al. 2014] [Fink 1963] [Forward Velocity Effects 1976] [Fournier and Coe 1976] [Franco et al. 2026] [Franke and Weinig 1939] [Fu et al. 2012] [Furey 1980] [Furusawa and Kitamura 2020] [Furusawa et al. 2024b] [Furusawa et al. 2024a] [Gao et al. 2012] [Gao et al. 2024a] [Gentry and Margason 1968b] [Gentry et al. 1966] [Ghoshal and Nahon 2025] [Gilman 1944] [Goetzendorf-Grabowski 2014] [Goland et al. 1964] [Gong et al. 2017] [Gonçalves and da Silva 2025] [Gray 1943] [Groom et al. 2022] [Groom et al. 2025] [Grunwald 1961b] [Hammond and Margason 1964] [Han 2026] [Hawkswell et al. 2022] [Hayes et al. 1958] [Hebbar et al. 2022] [Heidersbach et al. 2024] [Herfray and Nahon 2024] [Hoad 1974] [Holzhauser et al. 1964] [Holzhauser et al. 1965b] [Hooker et al. 2020] [Houbolt and Reed 1962] [Howard and Miley 1989] [Howard et al. 1985b] [Howard et al. 1985a] [Huang et al. 2018] [Huang et al. 2023c] [Huang et al. 2023b] [Hwang et al. 2007] [Ikami et al. 2019] [Ikami et al. 2021] [Ikami et al. 2022] [Ishaque et al. 2025] [Ishaque et al. 2026b] [Iwasaki 1959] [Içke and Baysal 2021] [Jamaluddin et al. 2022] [James et al. 1959] [Jameson 1970] [Jayasundara et al. 2020] [Jayasundara et al. 2022] [Jia et al. 2021] [Jie et al. 2017] [Johnson and White 1983] [Johnson and White 1986] [Jun et al. 2026b] [Jun et al. 2026a] [Kambampati and Smith 2017] [Katz and Ashby 1991] [Katz et al. 1980] [Katzoff 1940] [Khan and Nahon 2014] [Khan and Nahon 2015] [Khan et al. 2013] [Kim et al. 2025e] [Kimball et al. 1997] [Kimberlin and Sinha 1983] [Kirby 1956a] [Klemstein and Liu 1972] [Koch 2026] [Kohn 1983] [Konishi et al. 2015] [Koyuncuoglu and He 2022] [Koyuncuoglu and He 2023] [Kroo 1986] [Kubo et al. 2009] [Kubo et al. 2010] [Kuhn 1957] [Kuhn 1959] [Kuhn and Grunwald 1960] [Kuhn and Grunwald 1961] [Kuhn and Spreemann 1956] [Kuijvenhoven 1990] [Kurane et al. 2018] [Lan 1975] [Lan et al. 2026] [Lee and Jung 2025] [Lenfers et al. 2017] [Leng et al. 2020] [Lesley and Woods 1924] [Lester and Fuller 1986] [Letkiewicz et al. 2026] [Levin et al. 1986] [Li and Da Ronch 2026] [Li et al. 2023d] [Li et al. 2024d] [Lin et al. 2023a] [Ljunggren et al. 1989] [Lobb et al. 2026b] [Lobb et al. 2026a] [Luthra 1984] [Makino and Nagai 2014] [Makofski and Menkick 1956] [Mallen and Dancik 1959] [Marcos] [Marcus et al. 2018] [Marretta 1997] [Matsuo and Hirano 1985] [Matsuo and Hirano 1986] [McKinzie 1976] [Mechanisms of Externally Blown 1975] [Melo] [Mendoza 1979] [Meng et al. 2023] [Merola et al. 2024] [Metcalfe 1985] [Mikhalyov et al. 2019] [Miley et al. 1985] [Miley et al. 1986] [Miley et al. 1988] [Minervino et al. 2022] [Miranda and Brennan 1986] [Mishra and Joshi 2024] [Misiorowski et al. 2019] [Mohamed and Nabawy 2026] [Montieth 1926] [Morelli et al. 2022] [Munk 1923] [Murnieks et al. 2024b] [Murnieks et al. 2024a] [Müller et al. 2012] [Müller et al. 2014a] [Müller et al. 2014c] [Müller et al. 2014b] [Narain 1983] [Nederlof et al. 2023] [Nederlof et al. 2025b] [Newsom 1967] [Newsom and Tosti 1962] [Nguyen 2021] [Nickle and Freeman 1939] [Zawodny et al] [Niro et al. 2024] [Nishida et al. 1991] [Niu et al. 2026] [Numerical Investigation of Propeller 2025] [Ohman et al. 1995] [Okawa et al. 2023] [Okumoto and Elsanker 1973] [Page and Aiken 1971] [Parlett et al. 1973] [Paruchuri et al. 2022] [Passe et al. 2015] [Pasupuleti et al. 2025] [Patil and Navrátil 2024] [Peri and Mishra 2026] [Petrov 1993b] [Pham and Marshall 2011] [Phillips 2002] [Plijter et al. 2025] [Poggi et al. 2021] [Popowski and Dąbrowski 2018] [Prabhu and Tiwari 1983] [Prabhu et al. 1985] [Raj and Chidambaram 2025] [Purser and Spear 1946] [Qaissi et al. 2026] [Qiao and Barakos 2025] [Quinlan et al. 1996] [Wickens and Nguyen 1991] [Raghavan et al. 1990] [Rais-Rohani 1999] [Ralston and Hultburg 2010] [Rangwalla and Wilson 1987] [Rauhut and Slingerland 2003] [Ren and Liu 2021] [Ren and Liu 2022] [Ren and Zha 2024] [Ren and Zha 2025] [Renooij and Slingerland 2004] [Reveles et al. 2020] [Ribeiro et al. 2023] [Ribner 1944] [Riccobene et al. 2023] [Rizk 1980a] [Rizk 1980b] [Rizk 1981] [Roosenboom and Schröder 2009] [Roosenboom et al. 2007] [Roosenboom et al. 2009b] [Roosenboom et al. 2009a] [Roosenboom et al. 2010] [Saetti et al. 2026] [Salikuddin et al. 1985] [Salikuddin et al. 1987] [Sandahl 1945] [Santos et al. 2026a] [Santos et al. 2026c] [Schipholt et al. 1993] [Schollenberger et al. 2019] [Schollenberger et al. 2022] [Schollenberger et al. 2025] [Schollenberger et al. 2026] [Schouten 1982] [Schouten 1993] [Schouten 1999] [Schroijen and Slingerland 2007] [Seibert and Lewis 2005] [Selig 2010] [Setiawarman et al. 2026] [Shahjahan et al. 2026] [Shams et al. 2020] [Shao et al. 2025a] [Sharpe and Agarwal 2019b] [Sheridan 1978] [Shi 2019] [Shivers et al. 1976] [Shruti and Sivapragasam 2021] [Silva] [Silva] [Silva et al. 2022] [Simmons et al. 2025a] [Simmons et al. 2026b] [Sinnige and Della Corte 2024] [Sinnige et al. 2018] [Sinnige et al. 2019a] [Sinnige et al. 2019b] [Sinnige et al. 2021] [Sleeman and Phelps 1976] [Slotnick et al. 2000] [Smith et al. 2023] [Snyder and Zumwalt 1969] [Song et al. 2024d] [Sowyrda 1961] [Sparks and Miley 1983] [Spreemann 1957] [Spreemann 1958] [Spreemann and Kuhn 1956] [Sridhar and Smith 2026b] [Sridhar and Smith 2026a] [Sridhar et al. 2025] [Srivathsan and Rauleder 2023b] [Srivathsan and Rauleder 2023a] [Srivathsan and Rauleder 2024] [Srivathsan et al. 2024] [Stapleford et al. 1974] [Stiesz 1940] [Stokkermans et al. 2019a] [Stoll 2015] [Stone 2002a] [Stone 2008] [Strash et al. 1998] [Stuermer 2006] [Stuper 1938] [Sudhakar et al. 2016] [Swift and Bartel 1989] [Swihart and Nortin 1953] [Takagi and Inumaru 1967] [Tang and Chung 2022] [Teodosio et al. 2024] [Theodorsen 1944] [Thoren and Johnson 1940] [Tran et al. 2020] [Tran and Lim 2022] [Tran and Lopez 2025] [Turhan et al. 2025] [Turner and Drinkwater 1963] [Unruh 1986] [Unruh 1987a] [Unruh 1987c] [Unruh 1988a] [Van Den Borne and Van Hengst 1990] [van der Kooij 1986] [Van der Leer and Hoogreef 2022] [van der Wall 2024a] [Veldhuis and Khajehzadeh 2019] [Veldhuis and Rentema 1995] [Vidal et al. 1960] [Ahuja and Litherland] [Vogeley and Hart 1955] [Vonglahn et al. 1972] [Wang and Jin 2025] [Wang and Lee 2025] [Wang and Lee 2026] [Wang et al. 2014] [Wang et al. 2019e] [Wang et al. 2021a] [Wang et al. 2025m] [Wang et al. 2027] [Waterman 2024] [Wechtler et al. 2025] [Wei et al. 2026a] [Weiberg et al. 1973] [Welge and Crowder 1978] [Welge et al. 1981] [Westcott et al. 2025b] [Whitfield and Jameson 1983] [Whitfield and Jameson 1984] [Whitt and Gandhi 2023] [Wilson 1942] [Winston and Huston 1962] [Wood 1932] [Wood 1933] [Wu et al. 2019] [Xi et al. 2025a] [Xiong et al. 2026b] [Xu et al. 2012] [Xue and Zhou 2020b] [Xue and Zhou 2020a] [Yan et al. 2025] [Yang et al. 2014] [Yang et al. 2015a] [Yang et al. 2022a] [Yang et al. 2024b] [Yin and Stuermer 2010] [Ying et al. 2015] [Zanotti et al. 2024] [Zawodny et al. 2021] [Zha 2023] [Zha and Ren 2023] [Zha et al. 2024] [Zhang et al. 2010] [Zhang et al. 2013] [Zhao and Xu 2019] [Zhao et al. 2022b] [Zheng et al. 2024b] [Zhou et al. 2020b] [Zhou et al. 2021a] [Zikyamov and Panayotov 2025] [Zizkovsky and Klesa 2019]

Ground effect, downwash and the vertiport

What the downwash does on arrival. Ground effect on rotors, propellers and jets, suckdown and fountain flow, hot gas ingestion, downwash and outwash, brownout, and the vertiport. The ground literature moved from the aircraft to the site. 36 titles name hot gas, ingestion, suckdown or the fountain, with a median year of 1992, while 134 name a vertiport, none dated before 1990, with a median year of 2025.

390 records. [Adarkar and Hall 1968] [Adarkar and Hall 1969] [Afzal and Malik 2018] [Allen 2004] [Amuedo et al. 1989] [Amuedo et al. 1991] [Andronikos et al. 2021] [Angle et al. 2003] [Aoyagi and Hickey 1963] [Appel et al. 2024] [Arora et al. 2022] [Asdurian 1967] [Aslani et al. 2022] [Babu and Ramamoorthy 2026] [Bae et al. 2022] [Baltazar et al. 2026] [Barata 2013] [Bardera Mora and Matías García 2022] [Bassey 2025] [Batther et al. 2026] [Bauer 1987] [Bauknecht et al. 2019] [Bernyk et al. 2023] [Bevilaqua et al. 2007] [Bevilaqua et al. 2010] [Bhattacharya et al. 2003] [Bhattacharyya and Conlisk 2003] [Binion 1970b] [Blake and Laughrey 1987] [Bodson and Athans 1985] [Bolanovich and Marks 1959] [Brinkman and Johnson 2021] [Brinkman et al. 2020] [Bris and Nguyen 2022] [Le Bris and Nguyen 2023a] [Brown and Whitehouse 2003] [Butler and Thomas 1964] [Cacciavillani and Ielmini 2019] [Cai and Gunasekaran 2024] [Calvert and Wenren 2019] [Campbell et al. 1977] [Campbell et al. 1978] [Cao 1999] [Cao and Su 2003] [Carangui et al. 2016] [Carico] [Castells and Mishler 1973] [Chae et al. 2023] [Chamberlain et al. 2026] [Chati et al. 2026] [Chawla et al. 1990] [Chen et al. 2026e] [Cheng et al. 2026b] [Choi et al. 2021] [Choi et al. 2025b] [Choi et al. 2026b] [Chun 2003] [Cohen 1996] [Cohen and Shaheen 2021] [Conrad et al. 2024] [Cook et al. 2005] [Curtis 2002] [Curtis et al. 2005] [Curtiss 1965b] [Curtiss et al. 1985] [Dawson and Omar 1977] [deBrun et al 2003] [Deng 2019] [Deng et al. 2017b] [Deng et al. 2018] [Design Concepts for Minimizing 1981] [Dombrovschi et al. 2025] [Dudley et al. 1986] [DuWaldt 1966] [Eberhart and Wilhelm 2017] [Eshleman et al. 1986] [Eshlemen 1985] [Evaluation of the Navigation 1979] [Fanucci et al. 1969] [Feng et al. 2026c] [Foshag 1966] [Freitas et al. 2026] [Fricker et al. 1992] [Fricker et al. 1994] [Fujisawa et al. 2022] [Furlan et al. 2026b] [García Crespillo et al. 2024] [Garrick et al. 2013] [Gentry and Margason 1966] [George et al. 1964] [Ghareeb 1964] [Gilmore 2025] [Goodson 1967b] [Gottschalg et al. 2025] [Gouveia et al. 2022] [Greco et al. 1997] [Green and Zanine 1984] [Greene 2020] [Griffiths and Leishman 2002] [Griffiths et al. 2005] [Grunwald 1964] [Guo et al. 2024c] [Guo et al. 2025a] [Guo et al. 2025b] [Ha et al. 2024] [Ha et al. 2026] [Halder and Gandhi 2025] [Hall 1967] [Hall 1970] [Hange and Wardwell 1992] [Hange and Wardwell 1993] [Hange et al. 1996] [Harman et al. 1994] [Harry and Trobaugh 1966] [Heyson 1962b] [Heyson 1962a] [Hazen and Seckel 1950] [He and Leang 2024] [He et al. 2023a] [He et al. 2026b] [Henriksson et al. 2015] [Heo and Lee 2024] [Heo et al. 2026] [Hess et al. 2024] [Heyson 1961] [Higgins and Wainwright 1964] [Higgins et al. 1966] [Hijazeen et al. 2026] [Hill et al. 1982] [Hinshaw et al. 1964] [Hoad and Gentry 1975] [Hoad and Gentry 1977] [Hosseini et al. 2010] [Hot Gas Ingestion 1984] [Hot-Gas Ingestion 2007] [Houlihan and Thompson 1972] [Hsu 1963] [Huang and Macinnes 1988] [Huggett 1959] [Huh et al. 2026] [Hussien et al. 2026] [Huston and Winston 1960] [Huynh et al. 2025] [Hwang and Kwon 2019] [Hwang and Tsou 1981] [Ignatkin et al. 2021] [Ing and Zhang 1993] [Ison 2025] [Jenkins and Marks 1975] [Jensen 1990] [Jiménez-Losada et al. 2025] [Jin and Ma 2025] [Johns et al. 1988] [Johnson et al. 2024] [Johnson et al. 2025] [Junjie et al. 2026] [Kai et al. 2022] [Kalra and Baeder 2017] [Kalra and Greiwe 2026] [Kalra et al. 2011] [Kapulu and Tekinalp 2017] [Karemaa et al. 1979] [Kemp 1967] [Kemp 1969] [남서울대학교 대학원 빅테이터콘텐츠융합학과 교수 and Kim 2025] [Kim and Hong 2024] [Kim and Park 2022] [Kim and Yee 2020] [Kim et al. 2024a] [Kim et al. 2024b] [Kiran et al. 2025] [Koc¸er et al 2008] [Kotansky 1982] [Kotansky and Bower 1977a] [Kotansky and Bower 1977b] [Kotansky and Bower 1978] [Krois et al. 2024] [Kuhn 1965] [Kuhn 1979] [Kuhn 1982] [Kuhn 1987a] [Kuhn 1987b] [Kuhn et al. 1993a] [Kuhn et al. 1993b] [Kumar and Vijayakumar 2020] [Kumar et al. 2023] [Köse and Özuysal 2023] [Laghrib et al. 2024] [Lake et al. 2000] [Lavi 1967b] [Le Bris and Nguyen 2023b] [Lee and Cho 2025] [Lee et al. 2024c] [Lee et al. 2025b] [Lee et al. 2026a] [Leese 1964] [Leese and Knight 1974] [Lehman 1971] [Leonard 2001] [Lepe and Huynh 2026] [Levin and Wardwell 1997] [Li et al. 2020b] [Li et al. 2025l] [Li et al. 2025e] [Li et al. 2026l] [Liaw et al. 1993] [Lim and Yee 2026] [Lissaman 1967] [Lissaman 1969a] [Liu et al. 2026d] [Loeffler and Steinhoff 1984] [Long 1944] [Lord 1985] [Loth and McCormick 1986] [Louis-Ferdinand et al. 2025] [Louisse and Marshall 1974] [Louisse and Marshall 1976] [Lu and Lee 2019] [Lu et al. 2025] [Lu et al. 2026] [Luo and Chen 2026] [Lv et al. 2021] [Lyu and Feng 2026] [Ma and Xiao 2026] [Ma et al. 2025a] [Maksoud et al. 2025] [Maleki et al. 2024] [Maleki et al. 2025] [Maleki et al. 2026] [Mannan and Hassanalian 2024] [Mannan et al. 2025] [Mayo et al. 2016] [McMuldroch 1979] [Mehrabi and Davari 2020] [Mendonca et al. 2022] [Mercan et al. 2024] [Mercan et al. 2025] [Merrick 1984] [Miccio et al. 2024] [Migdal et al. 1979] [Milluzzo and Leishman 2017] [Minervino et al. 2016] [MirkoviĆ and Sindik 2024] [Mirković et al. 2026] [Moore and Hassanalian 2025] [Morse and Newhouse 1960] [Morse and Newhouse 1961a] [Morse and Newhouse 1961b] [Morse et al. 2024] [Mourtos et al. 1995] [Mulyanto et al. 2026] [Myers and McLaughlin 2015] [Nagrare and Lieb 2026] [Neumann et al. 2020] [Nordquist et al. 1972] [O’Bryan 1961] [O’Hara] [Obryan 1960] [Oliver and Stanzione 1993] [Otsuka et al. 2024] [Pan et al. 2014] [Park and Kim 2022] [Park and Kim 2026] [Peisen and Ferguson 1996] [Peksa et al. 2023] [Penrose and Smith 1996] [Perrotta 2015] [Peters and Shirazi 2025] [Petit and Ribeiro 2025] [Pickles et al. 2018] [Polsky 2000] [Porcacchia et al. 2023] [Preis 2021] [Preis 2023] [Preston 1994] [Pruyn and Lönroth 1993] [Pruyn and Taylor 1970] [Pruyn and Taylor 1971] [Pruynn and Shannon 1980] [Pulla and Conlisk 2005] [Qiao et al. 2026] [Qu et al. 2017] [Radford and Andrisani 1980] [Radhakrishnan and Schmitz 2003] [Radhakrishnan and Schmitz 2005] [Radhakrishnan and Schmitz 2006] [Radhakrishnan and Schmitz 2007] [Radotich 2026] [Vijayaraj et al. 2025] [Rakas 2022] [Ramasamy and Yamauchi 2017] [Ramasamy et al. 2015] [Rawat and Kupietz 2026] [Renselaer 1975] [Renselaer 1977] [Richardson et al. 2007] [Rimjha and Trani 2021] [Robins et al. 1994] [Rohrmeier et al. 2025] [Romander et al. 2026] [Rotor Downwash Modeling 2018] [Rozhdestvensky 2000b] [Rozhdestvensky 2000d] [Rozhdestvensky 2000a] [Rozhdestvensky 2000e] [Rozhdestvensky 2000f] [Rozhdestvensky 2000c] [Rupert 2008] [Saddington et al. 2002] [Saddington et al. 2008] [Saddington et al. 2009] [Saijo et al. 2003] [Saleh and Young 2023] [Saripalli et al. 1997] [Schuldenfrei 1942] [Schultz et al. 2009] [Schwarz et al. 2019] [Schwarz et al. 2020] [Seiffer et al. 2015] [Sheth 2023] [Siclari et al. 1980] [Silva and Navair 2011] [Smith et al. 1993] [Branco et al. 2025] [Stefana et al. 2024] [Stevens 1985] [Stevens 1987] [Stewart and Walters 1996] [Strong 2011] [Study on the Ground 2022] [Su et al. 2024b] [Su et al. 2024a] [Swaid et al. 2023] [Tan et al. 2018b] [Taylor et al. 2020] [The Moving Wall Effect 1993] [Thipyopas and Moschetta 2010] [Tokutake et al. 2022] [TÜMse et al. 2021] [VanOverbeke and Holdeman 1990] [Vascik and Hansman 2019] [Veneruso et al. 2023] [Volakakis and Mahmassani 2024] [Volakakis and Mahmassani 2025] [Wachspress et al. 2026] [Wang et al. 2025o] [Wang et al. 2026d] [Wardwell et al. 1993] [Warner et al. 1985] [Watson et al. 1967] [Weber and Gay 1975] [Welsch and Fichter 2023] [Wernicke 1981] [White et al. 1960] [Wille et al. 2026] [Wingrove 1974] [Wingrove 1975] [Winter et al. 2025] [Wu et al. 2025a] [Wu et al. 2026e] [Wu et al. 2026a] [Xie et al. 2026b] [Xin et al. 2015] [Xiong et al. 2023] [Yang et al. 2019] [Yang et al. 2026h] [Yilmaz et al. 2019] [Yoon et al. 2024] [Yoon et al. 2025] [Young 2015] [Yu 2023] [Zalay et al. 1979] [Zame et al. 2026] [Zare et al. 2025] [Zare et al. 2026] [Zelinski 2020] [Zhang and Wang 2026] [Zhang et al. 2022c] [Zhang et al. 2025c] [Zhang et al. 2026e] [Zhang et al. 2026b] [Zhang et al. 2026d] [Zhao and Feng 2024] [Zhao and Han 2026] [Zhao et al. 2023c] [Zhao et al. 2025f] [Zhou et al. 2026b] [Zhou et al. 2026a] [Zhou et al. 2026e] [Zhou et al. 2026d]

Transition, the conversion corridor and its optimisation

The path between hover and wing-borne flight. Transition and conversion, their dynamics and control, the corridor and the trajectory through it. The corridor is a recent word. Twelve titles name a corridor, and none is dated before 2021, which agrees with the review above in placing the optimised corridor in the present literature.

302 records. [Akhtar and Maqsood 2024] [Alcañiz-Brull et al. 2026b] [Alsharif et al. 2026] [Amargianitakis et al. 2022] [Angelov and Holzapfel 2022] [Ansari et al. 2018] [Gardner et al] [Appleton et al. 2021] [Arias et al. 2025] [Aroussi 2026] [Avanzini et al. 2001] [Bai et al. 2025] [Batther and Lee 2022] [Bhardwaj et al. 2018] [Bhardwaj et al. 2019] [Biyela and Rawatlal 2019] [Boekfah 2017] [Burton et al. 2023] [Burton et al. 2026] [Cai et al. 2026] [Carnes and Coder 2019a] [Carnes and Coder 2019b] [Carnes and Coder 2022] [Chang et al. 2021] [Chen 2019] [Chen 2023] [Chen et al. 2021d] [Chen et al. 2024d] [Chen et al. 2026g] [Choi et al. 2010] [Choi et al. 2025a] [Chu et al. 2009] [Clark et al. 1982] [Coles 1968] [Cong et al. 2024a] [Cong et al. 2024b] [Cong et al. 2025] [Dai Chao et al. 2016] [Dawe et al. 2025] [de Paula et al. 2025] [Deng et al. 2021] [Deng et al. 2025b] [Di et al. 2025] [Dollinger et al. 2021b] [Dollinger et al. 2021a] [Dony and Islam 2026] [Dragos Daniel et al. 2026] [Drinkwater 1960] [Duvivier and McCallum 1960] [Elanchezhian and Anitha 2023] [Engelland 1991] [Englar and Kirkpatrick 1969] [Erhard et al. 2025] [Exadaktylos et al. 2023] [Fan et al. 2022a] [Fan et al. 2025] [Farid and Jungers 2026] [Fenny and Hart 2000] [Frank et al. 2007] [Franklin and Innis 1980] [Fu et al. 2018] [Fu et al. 2020] [Gao et al. 2017] [Gao et al. 2024c] [Gao et al. 2025b] [Gao et al. 2025c] [Garcia Perez et al. 2025] [Gardner et al. 2019] [Gardner et al. 2021] [Garg et al. 1990] [Gentry and Margason 1968a] [Girard 1959] [Grahame 1968] [Guan et al. 2025a] [Górska et al. 2024] [Hadytama and Sasongko 2016] [Hadytama and Sasongko 2017] [Han et al. 2021] [Heineck et al. 2020] [Heister 2013] [Heister 2016] [Hernandez-Garcia and Rodriguez-Cortes 2015] [Hill 1981] [Hoadley 1979] [HongqianJiang et al. 2026] [Hu et al. 2024a] [Hu et al. 2024b] [Hua et al. 2026] [Huan et al. 2021] [Huang and German 2025] [Huang et al. 2020a] [Huangzhong et al. 2014] [Huntley 1972] [Hyun et al. 2023] [INAV-Based Adaptive Transition Control 2025] [Irmawan et al. 2023] [Jain 2017] [Jamaluddin et al. 2021] [Heineck et al] [Jeong et al. 2010] [Ji et al. 2016] [Jiang et al. 2025b] [Bullock et al] [Johnson and Craig 1974] [Junquan et al. 2017] [Yokesh et al. 2025] [Kahne 2000] [Kang et al. 2026b] [Ke et al. 2014] [Kelley 1962] [Key 1970] [Kim 2026] [Kim et al. 2025g] [Kim et al. 2025f] [Kirkpatrick and Murphy 1968] [Kjerstad and Paulson 1993] [Kottapalli and Meza 1992] [Krishna et al. 2018] [Kuhn 1981] [Kuhn and Vogler 1965] [Kumar 2026a] [Kumar G and Mukherjee 2024] [Kunz et al. 2024] [Vu et al. 2025] [Lee and Kim 2024] [Lee et al. 2025f] [Lee et al. 2025a] [Lee et al. 2026b] [Levinsky et al. 1968] [Li 2008] [Li and Xia 2018a] [Li and Yang 2025] [Li et al. 2020a] [Li et al. 2024e] [Li et al. 2025i] [Li et al. 2025j] [Li et al. 2025k] [Li et al. 2026j] [Li et al. 2026a] [Liang et al. 2025] [Liang et al. 2026] [Lin et al. 2023b] [Liu et al. 2017] [Liu et al. 2018b] [Liu et al. 2018a] [Liu et al. 2024a] [Lou et al. 2024] [Lou et al. 2025] [Lovell et al. 1953] [Lu et al. 2022a] [Ma and Wang 2018] [Magariyama and Abiko 2020] [Magee and Taylor 1971] [mao et al 2026] [Marchini] [Margason 1966] [Margason and Hoad 1979] [Martin 1964] [Marvakov and Holzapfel 2021] [McCormick 1956a] [McGuirk 2007] [Mohammadi et al. 2023] [Moitra 2014] [Morino et al. 2000] [Morscheck 2021] [Mukherjee et al. 2023] [Muraoka et al. 2024] [Nabi et al. 2019] [Nie et al. 2024] [North et al. 2018] [Orndorff and Hwang 2022] [Orndorff et al. 2023] [Otis 1962] [Overmeyer and Martin 2017] [Overmeyer et al. 2018] [Paiva et al. 2018] [Panish and Bacic 2023] [Parra et al. 2026] [Parwani and Coder 2018] [Patel et al. 2022] [Pelletier and Giroux 2000] [Peng et al. 2013] [Peng et al. 2014] [Li et al. 2015] [Peng et al. 2026a] [Perraud and Moens 2007] [Petersen 1986] [Pirera 1983] [Pobikrowska and Goetzendorf-Grabowski 2025] [Prabhakar et al. 2025] [Qing et al. 2023a] [Qing et al. 2023b] [Rae 1972] [Ramnath 1969] [Ramnath 1970] [Rampy 1966] [Reiss et al. 2021] [Ren et al. 2025] [Righetti et al. 2017] [Riley et al. 1989] [Saetti 2025] [Safi’i et al. 2021] [Sagan et al. 2021] [Sagan et al. 2025] [Sakai and Abiko 2020] [Salahudden et al. 2023] [Salahudden et al. 2024] [Semelka and Rauleder 2026] [Sharma et al. 2025] [Sheng 2018] [Sheng and Zhao 2016] [Shimizu and Miwa 2018] [Shimizu and Miwa 2019b] [Yoon 2005] [Siniff 1999] [Skelton 1968] [Smith 1958a] [Smith 1958b] [Song et al. 2024c] [Spadão et al. 2026] [Spreemann 1960] [Spreemann 1966] [Spreemann 1968] [Staruk and Datta 2019] [Staruk et al. 2017] [STOL Operation Transition-in-Ground Effect 2007] [Stoll and Mikic 2022] [Sun et al. 2009] [Sun et al. 2022] [Sunkara et al. 2014] [Surmann et al. 2025] [Takii et al. 2020a] [Tal et al. 2023] [Tapscott and Kelley 1960] [Theys et al. 2016] [Thirumaleshwar Hegde et al. 2020] [Thirumaleshwar Hegde et al. 2021] [Three-Bladed Propeller Conversion 1999] [Tian et al. 2026] [Tran and Yeo 2022a] [Tran and Yeo 2022b] [Tran et al. 2023] [Transition Dynamics of VTOL 2010] [Trenka 1967] [Verling et al. 2017] [Verma and Junkins 2000] [Vogler 1966] [Vorsin and Arogeti 2017] [Wang et al. 2019f] [Wang et al. 2024b] [Wang et al. 2025g] [Wang et al. 2026h] [Wang et al. 2026l] [Wang et al. 2026a] [Wen et al. 2020] [Westcott et al. 2025a] [Wu and Hu 2014] [Wu et al. 2024a] [Wu et al. 2026d] [Xi et al. 2021] [Xi et al. 2025b] [Xi et al. 2025c] [Xu et al. 2024d] [Xu et al. 2027] [Xue et al. 2026a] [Yan et al. 2023a] [Yang et al. 2022d] [Yang et al. 2023c] [Yang et al. 2024c] [Yang et al. 2026a] [Yang et al. 2026b] [Yangping and Honggang 2018] [YAV-8B Reaction Control System 1993] [Ye and Zong 2025] [Yeo and Liu 2018] [AvMC et al. 2020] [Yeo and Saberi 2021] [Ying and Liang 2013] [Yu and Zhao 2026] [Yu et al. 2017] [Yu et al. 2025] [Yuan et al. 2015] [Yue and Xia 2009] [Yuksek and Inalhan 2022] [Yuksek et al. 2016] [Zaludin 2024] [Zaludin and Gires 2019] [Zaludin and Harituddin 2019] [Zaludin et al. 2021] [Zhang et al. 2018a] [Zhang et al. 2019b] [Zhang et al. 2023e] [Zhang et al. 2023b] [Zhang et al. 2024e] [Zhao et al. 2014] [Zhao et al. 2023a] [Zhao et al. 2024c] [Zheng et al. 2011] [Zheng et al. 2020] [Zheng et al. 2026c] [Zhou et al. 2025] [Zuo et al. 2025]

Electric vertical take-off and urban air mobility design

The configuration’s modern market. Electric vertical take-off aircraft and urban air mobility, their design, demand, acceptance and operation. 256 of these titles name an electric vertical take-off aircraft, urban air mobility or an air taxi, and none of the dated ones is earlier than 2017.

264 records. [Abraham et al. 2026] [Acheson et al. 2025] [Edsel et al] [Afonso et al. 2021] [Ahmed] [Al labbad] [Aldao et al. 2023] [Alhatim 2024] [Angel 2026] [Antcliff et al. 2019] [Tang] [Are We Ready 2019] [Asfour et al. 2025] [Barsotti et al. 2026] [Beak and Kim 2026] [Adelstein et al] [Biehle 2022] [Bogdanović et al. 2024] [Bonaventura and Guardone 2025] [German et al] [Bridgelall 2024] [Bridgelall et al. 2022] [Brignardello 2023] [Brown and Harris 2020] [Bueno Luque Filho and Azevedo 2025] [Campanale and Grace 2025] [Cha et al. 2024] [陈 2025] [Ci̇zreli̇oğullari et al 2022] [Clare 2026] [Cureton 2020] [Deniz et al. 2024] [DeVore et al. 2022] [Nithya et al. 2025] [Thipphavong] [Zahn et al. 2024] [Dempsey 2021] [Deniz et al. 2023] [Design and Simulation 2024] [Ding et al. 2022] [Doo 2020] [Doo 2022a] [Doo 2022b] [Doo 2023] [Du et al. 2025a] [Edwards 2019] [Hendricks et al] [eVTOL 2026] [Wei and Mathivanan 2023] [Fardin et al. 2026] [Feary 2018] [Feary 2026] [Fedrigo 2023] [Ferrare] [Ferrell and Anderegg 2020] [Fraticelli Rivera et al. 2025] [Furqan 2025] [Garg and Moon 2026] [Garrow and Kim 2024] [Gaspari and Di Guardo 2023] [German et al. 2023] [Gertz and Manderscheid 2025] [Gomes de Souza and Silva 2025] [Gong et al. 2026b] [Gonzalez et al. 2026b] [Greenfeld 2020] [Gutierrez] [Hakim 2024] [Halder and Gandhi 2026] [Hasselmann 2026] [Arneson and Thipphavong] [Hendricks et al. 2020] [Hermyt and Pastucha 2024] [Hine et al. 2024] [Hine et al. 2025] [Hoffmann et al. 2023] [Ng] [How to Tackle 2022] [Hu] [Hu and Dong 2023] [Hu and Dong 2024] [Hu et al. 2026c] [Tang et al] [Huang et al. 2023a] [Huang et al. 2025] [Häckel et al. 2024] [Ilapuram] [Ismail et al. 2024b] [Ito et al. 2019] [Putnam and Littell] [Putnam and Littell] [Putnam et al] [Putnam et al] [Chamberlain et al] [Jang et al. 2024] [Jarvi and Nadler 2026] [Jeong et al. 2024a] [Kaneshige et al] [Doo et al. 2021] [Johnson and Silva 2018] [Littell and Pellettiere] [Littell and Pellettiere] [Jäckel et al. 2021] [Kalush and Chierichetti 2021] [Kaneko and Martins 2024] [Kaneshige et al. 2024] [Kang et al. 2023c] [Kang et al. 2024a] [Karimli and Marano 2025] [Kawamura et al. 2024] [Freeman 2023] [Freeman and Garcia] [Freeman and Garcia] [Freeman et al] [Goodrich and Theodore 2021] [Kim and Zhang 2025] [Kim et al. 2025c] [Kim et al. 2025b] [Kim et al. 2026] [Wasson et al. 2022] [Shish et al] [Kopardekar 2017] [Kopardekar 2019a] [Kopardekar 2019b] [Kopardekar 2020a] [Kopardekar 2020b] [Koshekov et al. 2026] [Koumoutsidi et al. 2022] [Kumar 2026b] [Moolchandani et al] [국립한국교통대학교 경영학과 교수 and Kwak 2026] [Humphrey et al] [Lerro 2020] [Li et al. 2025b] [Li et al. 2026b] [Lin 2023] [Littell 2019] [Lowry 2018] [Luciano] [Feary et al] [Madjdi and Zolfaghari 2023] [Maia and Lourenço da Saúde 2021] [Mak et al. 2026] [Marzouk 2025] [Matheis and Norrefeldt 2026] [Matveev et al. 2023] [McKillip 2022] [McQueen 2021] [Melo and Verri 2026] [Acheson et al] [Feary et al] [Vincent] [Michaud et al. 2026] [Milde 2003] [Milde et al. 2003] [Xue] [Mpala and Chakraborty 2025] [Sarkar et al] [Myasnikov and Ilyin 2023] [Mendonca] [Nassir Tafreshi 2026] [Neogi et al] [Jones et al] [Brown et al] [Campbell et al] [Namuduri and Gambold 2025] [Navarrete 2026] [Nguyen and Marion 2026a] [Nguyen and Marion 2026e] [Nguyen and Marion 2026c] [Craven et al] [Ogden 2023] [Okpara 2025] [Okpara 2026] [Okusuga and Morimoto 2026] [Omorodion 2023] [Ott 1998] [Kopardekar] [Patil and García-Sánchez 2025] [Patterson 2025] [Pavel 2022] [Santos et al. 2026b] [Suh et al] [Phadke and Majumdar 2025] [Pradeep et al. 2022b] [Pradeep et al. 2022a] [Pukhova et al. 2021] [Qanbari and Skorupski 2025] [Qi et al. 2025b] [Rahn et al. 2024] [Ratei et al. 2023] [Rathinasamy et al. 2024] [Rizzi 2026] [Salvador 2022] [Santhosh 2023] [Seren and Hornung 2023] [Shah 2025] [Shin 2025] [Sharma and Murphy] [Krishnamurthy et al] [Whiteside and Welstead] [Silva et al. 2018] [Simmons 2022b] [Simmons 2023b] [Bogner et al. 2025] [Souza et al. 2026] [Spühler et al. 2025] [Stanzione et al. 2019] [Stoll and Bevirt 2022] [Surmann et al. 2022] [Tacke 2026] [Tan and Low 2021] [Tang 2021] [Tang et al. 2022] [Tepylo and Laliberté 2025] [Tepylo et al. 2024] [Terpecz 2023] [Terpecz and Schuster 2024] [Terpecz and Schuster 2025] [Thompson et al. 2023] [Tokuoka et al. 2025] [Transport 2022] [Tremblay 2026] [Tripaldi and Bianchi 2025] [Nguyen 2025] [Tuccillo and Ruocco 2025] [Tumuluru Ramesh and Pandurangi 2022] [Ugwueze et al. 2023b] [Ulahannan et al. 2025] [Semanjski et al. 2023] [Varnousfaderani et al. 2025] [Vegh et al. 2019] [Ventura Diaz and Yoon 2018] [Ventura Diaz and Yoon 2019] [Verma et al. 2019] [Vieira et al. 2019] [Bulusu] [Bulusu] [Bulusu 2020a] [Bulusu 2020b] [Vuppala et al. 2024] [Wang 2026] [Wang et al. 2024a] [Wu et al. 2025b] [Wyzykowski 2025] [Xie and Chen 2026] [Xue 2020] [Yan et al. 2026] [Yanev and Staack 2026] [Yang et al. 2026e] [Yavas and Yavaş Tez 2023] [Yavuz 2024] [Yeganehdoust et al. 2023] [Yuan et al. 2026] [Zeng et al. 2021b] [Zhang et al. 2021b] [Zhang et al. 2024d] [Zhao and Sheng 2025] [Zhao et al. 2024a] [Zheng and Merret 2022] [Zheng and Merret 2023] [Zhengqi et al. 2022] [Šimeček 2023] [Аналіз Правил Експлуатації Evtol 2025]

Energy, batteries and sizing

The modern disc loading. Batteries, fuel cells and hybrid powertrains, energy and mission analysis, sizing and conceptual design. 67 titles name a battery, 65 of them from 2019 or later, and the 18 that name a fuel cell or hydrogen are none of them dated before 2019.

266 records. [Aboelela et al. 2026] [Acree 2014] [Adolf and Andert 2010] [Yashi Garg 2024] [Alba-Maestre et al. 2021] [Alulema et al. 2026] [An et al. 2022] [Anthony et al. 2009] [Datta 2021] [Ashok et al. 2015] [Набиев et al. 2021] [Bai et al. 2024] [Bando et al. 1993] [Barboza and Moffatt 1988] [Batra et al. 1986b] [Battery Testing 2023] [Beals 2018] [Beliautsou and Beliautsou 2024] [Beyne and Castro 2022] [Bhandari and Chakraborty 2025] [Blume 2026] [Bortkiewicz 1999] [Bosse et al. 1970] [Bossler and Robert B. 1965] [Brito] [Cavcar and Cavcar 2005] [Chai et al. 2025] [Chakraborty et al. 2023a] [Chaohui et al. 2026] [Chen et al. 2021a] [Chen et al. 2024c] [Cheng et al. 2025b] [Chu et al. 2026] [Clay et al. 1987] [Coe and Fournier 1976] [Coelho et al. 2022] [Collins and Atkins 2026] [Conceptual Design 2026] [Costa 2012] [Coy 2006] [Critchfield and Ning 2026] [Crossley and Rutherford 1995] [Davis and Ela 1969] [Detore and Sambell 1975] [Caminero et al. 2024] [Dixit et al. 2024a] [Dixit et al. 2024b] [Donateo and Çinar 2022] [Dong et al. 2025] [Dutton 1967] [Ednie et al. 1988] [Fay and Johnstone 1960] [Fay et al. 2025] [Guo et al. 2024b] [Fisler and Datta 2019] [Forville 1977] [Furlan et al. 2026a] [Gabel et al. 1961] [Gamble 2023] [Thomas et al] [Gertsma and Zigan 1973] [Glaudel 2021] [Goldsmith and Hickey 1963a] [Golombek et al. 2026] [Gong et al. 2026a] [Goshtasbi et al. 2024] [Goshtasbi et al. 2025] [Govindarajan and Sridharan 2021] [Graf et al. 2024] [Granado et al. 2022] [Gregoire 2023] [Guerrero and Clarke 2026] [Guibert et al. 2024] [Harris 2017b] [Hascaryo and Merret 2020] [Hatherall et al. 2024] [He et al. 2024b] [He et al. 2025b] [Head 1981] [Hegdahl 1993] [Heidary and Kosari 2024] [Hess 2019] [Hiller Aircraft Corp Palo Alto Ca 1955] [Hoffrichter 1978] [Howard 2012] [Hoyos et al. 2021] [Hu et al. 2026b] [Hudson and Gee 1977] [Huuva et al. 2018] [Ibrahim and Bil 2013] [Irvin and Swan 1956] [Islam et al. 2026] [Ito 2018] [Putnam] [Putnam et al] [Jexembaeyva and Alexander 2025] [Jiang et al. 2025a] [Jiao and Yang 2026] [Jin 2026] [Johnson 1995] [Joppa 1966] [Littell et al] [Kaneko and Martins 2023] [Kang and Chung 2024] [Kefford and Munch 1975] [Kelly and Lloyd 2015] [Kesling 1968] [Kohn 1972] [Kolluri et al. 2021] [Kraenzler et al. 2019] [Krismadinata et al. 2026] [Kunwar et al. 2023] [Kutney 1964b] [Kutney 1964a] [Lai et al. 2026b] [Leishman et al. 2004] [Leutzinger 1968] [Lewis 1989] [Li and Jiang 2026] [Li et al. 2018b] [Li et al. 2025d] [Lieblein 1970b] [Lira Sassett et al. 2025] [Littell et al. 2019] [Logan 1974] [Logan 1989] [Louthan 1980] [Lu et al. 2017] [López et al. 2022] [Ma and Liu 2025] [Ma et al. 2019a] [Maciolek and Wallischeck 1977] [Magee et al. 1974] [McAvoy and Gopalarathnam 2002] [Mihara et al. 2021] [Mo et al. 2026] [Mohana Sundaram and Kavya Santhoshi 2024] [Mokotoff et al. 2026] [Molinaro and Fioriti 2026] [Morris and Alexander 1978] [Nabiyev et al. 2020] [Study of Turboprop Systems 1978] [Namukasa et al. 2024] [Nederlof et al. 2025a] [Ng and Datta 2019] [Ng et al. 2019] [Ng et al. 2020] [Oyama et al. 2024] [Paek 2025] [Paek et al. 2021] [Palaia et al. 2021] [Panigrahi et al. 2021] [Park 2026a] [Park and Yee 2025] [Park and Yee 2026] [Park et al. 2022a] [Park et al. 2022b] [Park et al. 2022c] [Park et al. 2024b] [Park et al. 2024a] [Park et al. 2025b] [Park et al. 2026a] [Paw and Ang 2023] [Payne 2002] [Phung et al. 2024] [Piasecki 2026] [Pichitkul et al. 2023] [Prabhakar et al. 2026] [Propeller Propulsion Systems 2010] [Putnam et al. 2026] [Putra and Chakraborty 2023] [Qasem et al. 2024] [Qian et al. 2023] [Qian et al. 2026] [Qin et al. 2023] [Rajendran 2025] [Rosenstein 1989] [Rosenthal et al. 1988] [Rutherford et al. 1991] [Sambell 1976] [Sanderson and Holly 1993] [Santos et al. 2025a] [Conley et al] [Sato et al. 2009] [Schoser et al. 2022] [Scott and Schrage 2012] [Selleck 1978] [Senkans et al. 2020] [Senkans et al. 2021] [Serovy and Kavanagh 1974] [Shah and Ansell 2026] [Shao et al. 2023] [Shentu et al. 2026] [Shim et al. 2023] [Shovlin and Gambucci 1978] [Silva and Johnson 2021] [Silva and Solis 2024] [Simpson 1967] [Sirigireddy and Ahner 2026] [Sissingh 1960] [Smith 1966a] [Snyder 2016] [Snyder and Kohlman 2018] [Song and Underwood 2007] [Song et al. 2024a] [Sonkar et al. 2020] [Soule and Badri-Nath 1973] [Spierling et al. 2025] [Spillman 1965] [Spillman 1967] [Vashi et al] [Sridharan and Govindarajan 2021] [Stahl et al. 2020] [Stanzione 2025a] [Steele 2026] [Stein and Vichness 1971] [Stevenson et al. 2020] [Stuermer 2008] [Stuermer and Yin 2012] [Sulkoske et al. 1977] [Suti et al. 2025] [Schmitz et al] [Schmitz et al] [Tan et al. 2010] [Tang et al. 2020] [Tang et al. 2023] [Tanigawa and Kurose 2024] [Topac et al. 2024] [Tu et al. 2025] [Tulino et al. 1971] [Ugwueze et al. 2022] [Veres and Thurman 2010] [Wadia et al. 2022] [Wahler et al. 2025] [Wakabayashi and Katsui 2024] [Wang et al. 2025l] [Ward 1989] [Wentz 1977] [Wernicke 1980] [Wernicke et al. 1980] [Widdison et al. 1974] [Wilde et al. 2022] [Wilson and Bennett 1983] [Winter et al. 2021] [Wu et al. 2024b] [Wu et al. 2026c] [Xu and Raghavan 2023] [Xu and Raghavan 2024] [Xu et al. 2024c] [Yan and Wiston 2026a] [Yan and Wiston 2026b] [Yan et al. 2021] [Yang et al. 2026f] [Yang et al. 2026g] [Ayalew et al] [Young 2018] [Yu et al. 2026b] [Zabinsky and Burnham 1977] [Zabinsky et al. 1974] [Zhao et al. 2024e] [Zheng et al. 2026b] [Zhou et al. 2020a] [Zhu et al. 2024] [Zinjarde et al. 2026] [Çelik et al. 2023] [Çınar and Tunçel 2026]

The tilt-wing configuration

The configuration itself. The tilt-wing from the period programmes to the present, its stability, control, transition and design. The configuration returned. 230 titles name the tilt-wing, 42 of the dated ones from before 1970 and 150 from 2010 or later. 77 titles in this cluster name an electric vertical take-off aircraft, an unmanned aircraft or a drone, the earliest dated one from 2009, while the 17 that name the XC-142, the CL-84 or the VZ-2 have a median year of 1965 and none of them is dated 2010 or later.

249 records. [Aihaitijiang and Onal 2019] [Alvaro D. H. Arroyo et al. 2021] [Aoki and Muraoka 2019] [Arroyo] [Autenrieb et al. 2019] [Barra et al. 2020] [Bauer 2023b] [Simmons and Murphy] [Benkhoud and Bouallegue 2016] [Benkhoud et al. 2017] [Beppu and Curtiss 1966] [Binz et al. 2019] [Birckelbaw and Corliss 1992b] [Birckelbaw and Corliss 1992a] [Birckelbaw and Corliss 1994] [Birckelbaw et al. 1994] [Bouallegue and Khoud 2016] [Breul 1963] [Busan et al. 2021] [Cetinsoy et al. 2012] [Chakraborty and Mishra 2023] [Chakraborty et al. 2022] [Chakraborty et al. 2025] [Chambers and Grafton 1966] [Chambers and Grafton 1968] [Chambers and Grafton 1970] [Champine 1971] [Champine et al. 1970] [Chana and Sullivan 1992] [Chana and Sullivan 1993b] [Chance Vought Corp Dallas Tx 1963] [Chapman 2019] [Chauhan and Martins 2020b] [Chen et al. 2020a] [Choi et al. 2026a] [Comer and Chakraborty 2023b] [Comer and Chakraborty 2024] [Comer et al. 2026] [Cook 2025] [Aerospace et al. 2025a] [Cooper et al. 2018] [Crawford et al. 1996] [Curtiss et al. 1967] [Dancik et al. 1958] [Danielmeier et al. 2022] [Daud Filho] [Daud Filho and Belo 2023] [Perez et al] [Day 1965] [de Madrid et al. 2007] [Deckert et al. 1964] [Deckert et al. 1968a] [Deng et al. 2026c] [Çakir and Kurtuluş 2021] [DiMaggio et al. 2025] [DiMaggio et al. 2026] [Doff-Sotta et al. 2022] [Doff-Sotta et al. 2023] [Doff-Sotta et al. 2025] [Dolan 1964] [Escamilla et al. 2020] [Fatemi 2024] [Fay 1963] [Fay 1964] [Fenwick 1967] [Fink 1966] [Fink 1967] [Fink 1969] [Fink and Mitchell 1967] [Fink et al. 1964] [Fink et al. 1966] [Fling 1965] [Frost et al. 2002] [Fry 1965] [Geuther et al. 2020] [Giulianetti and Weiberg 1964] [Gold and Walchli 1974] [Goodson 1966b] [Goodson 1967a] [Gregory et al. 2015] [DiMaggio et al] [Grima 2016] [Grunwald 1961a] [Grunwald 1965] [Grunwald 1966] [Guerrero and Corliss 1991a] [Guerrero and Corliss 1991b] [Hancer et al. 2010] [Hargraves 1961] [Hartmann et al. 2017b] [Hartmann et al. 2017a] [He 2024] [He et al. 2020a] [Hendricks et al. 2019] [Hesse 1965] [Higgins et al. 2020] [Holsten et al. 2011] [Hong et al. 2025b] [Hong et al. 2025a] [Hospodář and Kulhánek 2026] [Hrishikeshavan and Chopra 2012] [Hsu et al. 2024] [Huang et al. 2024b] [Ibrahim et al. 2026] [Hassell and Kirby 1966] [Jeong et al. 2015] [Jin and Zhao 2025] [Kratz and Culley] [Judas and Deligiannidis 2013] [Katagiri et al. 2025a] [Katagiri et al. 2025b] [Kimball 1993] [Kirby and Newsom 1964] [Kirby et al. 1963] [Kolesar 1971] [Kolesar et al. 1970b] [Kolesar et al. 1970a] [Konrad 1967] [Konuk and Landman 2023] [Kratz and Culley 2021] [Krimphove et al. 2023] [Kukla 2026] [Kulhánek et al. 2023] [König et al. 2023] [Li et al. 2026c] [Lindqvist et al. 2015] [Liu et al. 2025a] [Liu et al. 2026b] [Lockhart] [Loewy and Yntema 1958] [Longhurst 1966] [Lovell and Parlett 1956] [Lovell and Parlett 1957] [Mahadev et al. 2024] [Marsh 1965] [Martin 1963a] [Martin 1963b] [Masuda and Uchiyama 2018] [Masuda and Uchiyama 2019] [May et al. 2022] [May et al. 2023] [May et al. 2024b] [May et al. 2024a] [May et al. 2025] [May et al. 2026a] [May et al. 2026c] [May et al. 2026b] [McCormick and Mallen 1956] [McCormick and Mallen 1957] [Michaelsen 1971] [Mikami and Uchiyama 2015] [Milz and Looye 2022] [Milz et al. 2024a] [Milz et al. 2024b] [Milz et al. 2025] [Milz et al. 2026a] [Misra et al. 2022] [Mita et al. 2021] [Mix et al. 2004] [Monnier 2026] [Monnier and Litherland 2026] [Muraoka et al. 2009] [Muraoka et al. 2016] [Murphy and Landman 2015] [Müller and Moormann 2023] [Newsom 1962a] [Newsom 1962b] [Newsom and Tosti 1959] [Nichols 1963] [Nichols 1990] [Nonami et al. 2010] [O’Heron et al. 1992] [O’Rourke and Rutherford 1991] [Ostermann 2016] [Ott et al. 2026] [Panish and Bacic 2022] [Panish and Bacic 2025] [Panish et al. 2023] [Partridge et al. 2021] [Pegg et al. 1974] [Persson and Lawrence 2017] [Phillips 1965] [Phillips 1969] [Pradeep and Wei 2018b] [Putman 1961] [Putman 1969] [Rohr et al. 2019] [Rostami et al. 2023] [Rothhaar et al. 2014] [Rutherford and Bass 1992] [Samadikhoshkho and Lipsett 2025] [Sanchez et al. 2019] [Sanchez-Rivera et al. 2019] [Sanchez-Rivera et al. 2020b] [Sanchez-Rivera et al. 2020a] [Sandoz et al. 2018] [Sato and Muraoka 2013b] [Sato and Muraoka 2013a] [Aerospace et al. 2025c] [Schütt et al. 2017] [Shahjahan et al. 2024] [Shinde et al. 2025] [Shinozuka et al. 2024] [Sim et al. 2022] [Simmons and Murphy 2021] [Simmons and Murphy 2022] [Small et al. 2016] [Stagliano and Hornung 2012] [Stepniewski 1957] [Stuart 1957] [Stuart 1959] [Stuart 1956] [Aerospace et al. 2025b] [Sullivan 1972] [Sullivan 1993] [Takayama et al. 2020] [Taubert et al. 2021] [Taubert et al. 2023] [Templin et al] [The Canadair CL-84 Experimental 1990] [Tosti 1959] [Tosti 1961] [Tosti 1962] [Totah 1991] [Totah 1992] [Totoki et al. 2015] [Totoki et al. 2016] [Wang et al. 2018c] [Wang et al. 2018b] [Wang et al. 2019d] [Wang et al. 2021b] [Wang et al. 2025f] [Wang et al. 2026b] [Ward 1960] [Watanabe and Muraoka 2026] [Xiang et al. 2025] [Yamaguchi and Hara 2022] [Yeh and Du 2023] [Yeh et al. 2023] [Yildiz et al. 2015] [Yokota and Fujimoto 2022] [Yokota et al. 2021] [Yue et al. 2025] [Yue et al. 2026] [Zhang et al. 2019c] [Zhao et al. 2025d] [Zheng et al. 2024a] [Zhu et al. 2025] [Çakir and Kurtuluş 2022]

Distributed electric propulsion

The arrangement that deletes the keystone. Distributed electric and hybrid propulsion, its aero-propulsive coupling and lift augmentation, and its control and noise. 186 titles name distributed propulsion, none dated before 2004, with a median year of 2023.

240 records. [Ahmed et al. 2024] [Alonso Castilla et al. 2021] [Anibal and Duensing 2025] [Armstrong et al. 2015] [Bai and Zhou 2023] [Barbosa Marques and Silva 2021] [Baris and Landman 2017] [Benjamin 2023] [Benjamin et al. 2025] [Simmons] [Benyamen and Keshmiri 2022] [Boissinot and Kheiri 2023] [Bonnin et al. 2023] [Borer and Patterson 2020] [Bowen 2025] [Bowen et al. 2023] [Böhnisch et al. 2022] [Böhnisch et al. 2026] [Cakin et al. 2020] [Chan 2019] [Chau et al. 2025] [Chelemen et al. 2023] [Chen et al. 2021b] [Chen et al. 2023e] [Chen et al. 2025a] [Chen et al. 2025b] [Cheng et al. 2022] [Choi 2014] [Choi et al. 2014] [Ciliberti and Nicolosi 2026] [Comunian et al. 2025] [Corcau et al. 2026] [Critchfield and Ning 2023] [Cui et al. 2027] [Cunningham et al. 2022] [Cuppoletti et al. 2024] [Cusati et al. 2023] [Daniel and Hendrick 2023] [Darmstadt et al. 2021a] [North et al] [Davis et al. 2025] [Deere et al. 2017c] [Deere et al. 2017a] [Deere et al. 2017b] [Deere et al. 2018] [Demers Bouchard et al. 2015] [Deng et al. 2026b] [Dillard et al. 2025] [Dippold et al. 2004] [Distributed Electric Propulsion 2018] [Donateo et al. 2023] [Dorfling and Traub 2023] [Dos Santos et al. 2024] [Duffy 2015] [Dumanli et al. 2026] [Dyson 2018] [Economou et al. 2019] [El Idrissi and D’Arpino 2024] [Electric and Hybrid-Electric Propulsion] [Eqbal et al. 2022] [Eqbal et al. 2023] [Erhard et al. 2021] [Feng et al. 2025b] [Firnhaber Beckers et al. 2022] [Firnhaber Beckers et al. 2023a] [Firnhaber Beckers et al. 2023b] [Fredericks et al. 2013a] [Fredericks et al. 2013b] [Freeman and Klunk 2018] [Galbraith 1979] [Gallani et al. 2020] [Garrett et al. 2019] [Gholamian and Beik 2026] [Ginn 2014] [Ginn 2015] [Gnadt et al. 2019] [Goldberg et al. 2015] [Goldberg et al. 2017] [Golovanov et al. 2019] [Gothing 2025] [Gothow et al. 2023] [Gothow et al. 2024] [Guddanti et al. 2022] [Gul and Yeo 2025] [Guérin and Tormen 2023] [Hange 2016] [Harada 2022] [Harish et al. 2018] [Herzog et al. 2021] [Hoenicke and Willich 2025] [Hoover 2024] [Hoover and Shen 2018a] [Hu et al. 2026a] [Huangfu et al. 2024] [Jedamski et al. 2023] [Jiang and Pakmehr 2022] [Jois et al. 2024] [Kang et al. 2014a] [Kang et al. 2014b] [Kang et al. 2026a] [Kawauchi 2026] [Keller 2023] [Keller 2025] [Kim et al. 2018] [Kirsch and Friedrichs 2023] [Klunk and Freeman 2018] [Kou et al. 2023] [Kuzniar et al. 2020] [Kuźniar and Orkisz 2019] [Lampl and Armanini 2023] [Laskaridis 2015] [Lee 2026] [Lei and Zhao 2023] [Li 2024a] [Li et al. 2022c] [Li et al. 2025a] [Li et al. 2025g] [Li et al. 2025h] [Li et al. 2026f] [Lindner et al. 2023] [Lindner et al. 2024] [Litt 2024] [Litt 2026] [Liu et al. 2025c] [Haworth et al] [Love 2022] [Luo et al. 2024] [Ma et al. 2022a] [Machado et al. 2025] [Miyairi et al. 2015] [Models of Electric and] [Moore and Ning 2018] [Morani et al. 2024] [Nark et al. 2017] [Nathan 2026] [Nguyen et al. 2016] [Ni and Lee 2025] [Borer] [Nguyen et al. 2025] [Nicolosi et al. 2022] [Nishikawa and Rinoie 2024] [Nolan et al. 2016] [North et al. 2021] [Notash et al. 2023] [Odukoya and Jo 2026] [Oldeweme et al. 2024a] [Oldeweme et al. 2024b] [Oldeweme et al. 2026] [Orefice et al. 2019] [Orefice et al. 2020] [Papathakis] [Papathakis 2017] [Papathakis et al. 2016b] [Papathakis et al. 2016a] [Papathakis et al. 2017] [Park and Park 2026] [Patterson et al. 2016] [Patterson et al. 2021] [Perry et al. 2019] [Pham et al. 2022] [Pieper et al. 2018] [Posada and Vargas 2020] [Pradeep et al. 2021] [Qiao and Zhou 2026] [Qiao et al. 2023] [Raush et al. 2016] [Rizzi et al. 2017] [Viggiano et al] [Schiltgen and Freeman 2019] [Schiltgen et al. 2011] [Schiltgen et al. 2012] [Schiltgen et al. 2013b] [Schiltgen et al. 2013a] [Schmidt et al. 2025] [Schneider et al. 2026] [Schrage et al. 2018a] [Şener et al. 2020] [Serrano et al. 2021] [Shang et al. 2025] [Sharpe and Agarwal 2019a] [Shaw et al. 2015] [Shen et al. 2026] [Shi et al. 2024] [Siddavatam et al. 2023] [Sinha 2026] [Soikkeli et al. 2023] [Song et al. 2024b] [Song et al. 2024e] [Song et al. 2025a] [Sorensen et al. 2025] [Spada et al. 2025] [Stoll and Veble Mikic 2016] [Sun et al. 2024a] [Suppes and Suppes 2024a] [Suppes and Suppes 2024b] [Suzuki et al. 2019] [Synodinos et al. 2018] [Takahashi et al. 2014] [Tatsis 2026] [Thapa et al. 2025] [Theron et al. 2020] [Thosar et al. 2026] [Trainelli 2026] [Tsoi et al. 2014] [Turhan et al. 2023] [Upadhyay and Zaman 2021] [Valencia et al. 2019b] [Valencia et al. 2019a] [Varela Martínez] [Vecchia et al. 2018] [Vepa 2020] [Vos 2019] [Vouros et al. 2022] [Wang and Hu 2026] [Wang et al. 2019b] [Wang et al. 2023a] [Wang et al. 2026j] [Wang et al. 2026k] [Wang et al. 2026c] [Wickersheim et al. 2023] [Wiston and Yan 2025] [Wu and Litt 2023] [Wu et al. 2023b] [Xie et al. 2023] [Xie et al. 2026a] [Yang and Huang 2023] [Yang and Zha 2018a] [Yang et al. 2024d] [Yang et al. 2025c] [Yu et al. 2021a] [Yu et al. 2026a] [Zeng et al. 2021a] [Zhang et al. 2023d] [Zhang et al. 2023a] [Zhao et al. 2024d] [Zhao et al. 2025e] [Zhao et al. 2025h] [Zhao et al. 2026d] [Zheng et al. 2025b] [Zong et al. 2024]

Certification, airspace and operations

Where the constraint now lives. Certification and airworthiness of powered-lift aircraft, airspace integration, air traffic management for urban air mobility, and the operations, demand and acceptance of the services. 52 titles name certification or airworthiness, with a median year of 2022.

226 records. [Abryandoko et al. 2026] [Almasabi and Zhang 2026] [Altouq et al. 2025] [Andriesen and Honaker 1987] [Ariante and Papa 2024] [Asher 1969] [Ayalew et al. 2026] [Bae et al. 2020] [Barbano and Costa 2023] [Barrett-Gonzalez et al. 2023] [Behme and Planing 2020] [Blackwell 1970] [Borer et al. 2014] [Borer et al. 2023] [Bosch et al. 2025] [Burrous et al. 1974] [Cabaleiro et al. 2024] [Caldwell and Lafavor 1980] [Carlucci et al. 2026] [Cartile et al. 2025] [Denham et al] [Cayot et al. 1972] [Certification of Tactics 2000] [Cha et al. 2025] [Chakraborty et al. 2023b] [Chakraborty et al. 2024] [Chakraborty et al. 2026b] [Chang et al. 2026] [Charnsethikul et al. 2025] [Chatterji 2020] [Cheyno 1967] [Cho et al. 2026] [Choi and Suk 2026] [Comer and Chakraborty 2023a] [Conrad et al. 2023] [Dai] [Hartman et al. 2023b] [Hartman et al. 2023a] [Doo 2021] [Dousis] [Ducard and Carughi 2024] [Edwards and Price 2020] [Ellis et al. 2023] [Farooqui 2025] [Farris et al. 1983] [Favaro et al. 2025a] [Favaro et al. 2025b] [Feistel et al. 1972] [Ferreira Filho and Cardoso Júnior 2024] [Fraser et al. 2018] [Fregnani and Balvedi 2026] [Gappa 1964] [Garren et al. 1970a] [Altamirano et al] [Lee et al. 2022] [Price et al. 2020] [Goericke et al. 2024] [Gottschall et al. 2022] [Grant et al. 2017] [Greenfeld 2019] [Guerreiro et al. 2020] [Gunnarson 2014] [Lee et al] [Lee et al] [Lee et al] [Harrison et al. 2019] [Hasan 2019] [Heffley et al. 1977] [Heilein and Crespillo 2024] [Hill and Garrow 2021] [Hollister 1969] [Hollister and Leet 1970] [Hollister et al. 1970] [Homola and Tiwari 2023] [Honaker 1987] [Huang et al. 2022b] [Hudock and Leonard 1969] [Human Factors Certification 2000] [Hynes and Scott 1976] [Iriarte et al. 2026] [Ison 2024] [Ito and Furue 2019] [Jacobson and Kuhlthau 1972] [Janetzko et al. 2024] [Janetzko et al. 2025] [Prince et al. 2024] [Jiang et al. 2026] [John 2026] [Jones and Jusko 2022] [Jusko et al. 2022] [Littell] [Kaczmarek et al] [Kang et al. 2024b] [Kazlauskas and Balčiūnas 2026] [Kannan et al] [Goodrich] [Goodrich] [Klyde et al. 2022] [Kopyt et al. 2024] [Kotwicz Herniczek et al. 2019] [Kress 1980] [Kundu et al. 2020] [Moolchandani] [Moolchandani 2021] [Moolchandani et al] [Laplante et al. 2026] [Lawrence and Head 2024] [Lebacqz and Scott 1984] [Lebacqz and Scott 1985] [Lei 2026] [Leonard et al. 2021] [Letica and Rizzi 2024] [Spirkovska et al] [Lim et al. 2023] [Lippoldt et al. 2023] [Lombaerts et al. 2020b] [Lv et al. 2026] [Ma and Ding 2023] [Ma et al. 2024] [Ma et al. 2025d] [Mahony and Lozano 1999] [Shaw-Lecerf et al] [McDonald 2015] [McGee et al. 1978] [McIntyre et al. 1977] [Meiklem 1969] [Merrick and Gerdes 1977] [Merrick and Gerdes 1983] [Monahova 2022] [Min et al. 2026b] [Monemi Nodehi et al. 2026] [Montaruli et al. 2026] [Neogi et al] [Nguyen and Marion 2026b] [Nguyen and Marion 2026d] [Oh et al. 2026b] [Oliveira and D’Amore 2026] [Darmstadt et al. 2021b] [Pearson 1965] [Pedrioli et al. 2024] [Peng et al. 2022] [Pleffken et al. 2024] [Pleffken et al. 2026] [Pradeep and Wei 2018a] [Pradeep and Wei 2018c] [Pradeep and Wei 2020] [Preis and Cheng 2022] [Preis and Hornung 2022b] [Preis and Hornung 2022a] [Preis and Hornung 2022c] [Puvrez 1964] [Puvrez 1965] [Rakas et al. 2021] [Ratei et al. 2024] [Reeder 1964] [Reid et al. 1973] [Mogford and Johnson 2023] [Bhandari et al] [Bhandari et al] [Rogers and Belluomini 2026] [Goyal et al. 2018] [Ren and Heng 2026] [Roltgen and Byrnes 1991] [Roman 2026] [Rudolph 1972] [Verma et al. 2020] [Verma et al] [Saxena et al. 2026] [Schneider 1989] [Schrage and Arterburn 2016] [Schrage et al. 2018b] [Schweiger and Knabe 2023] [Schweiger and Preis 2022] [Schweiger et al. 2023] [Yang et al. 2025b] [Shaik 2026] [Shiva Prakasha et al. 2022] [Shon and Lee 2025] [Shubert et al. 2026] [Sieb et al. 2023] [Silsby and Sawyer 1973] [Smith 2025] [Smith and Vickers 1970] [Das Biswas et al. 2025] [Song 2022] [Song and Yeo 2021] [Song et al. 2021] [Spedicato et al. 2016] [Strother and Upton 1971] [Study on Urban Air 2025] [Bharadwaj et al] [Bharadwaj et al. 2021] [Murthy et al] [Murthy et al. 2022] [Takacs and Haidegger 2022] [Tan et al. 2014a] [Tang et al. 2026] [Thipphavong et al. 2018] [Trimarchi 2023] [Tuck 1970] [Turchetti and Condé Rocha Murça 2024] [Umapathy et al. 2021] [Unverricht et al. 2024] [Vandy 2026] [Veldhuizen et al. 2026] [Veras Neto and de Andrade 2022] [Wang and Xu 2026] [Wild 2021c] [Cummings et al] [Taye et al. 2024] [Wang and Zhang 2020] [Wei et al. 2022] [Windolph 1969] [Wing et al. 2020] [Wu et al. 2026b] [Yan et al. 2024a] [Yokoyama et al. 2025] [Young and Rajagopalan 2013] [Young et al. 2011] [Zhang and Hwang 2025] [Zhang et al. 2025b] [Ziakkas 2026] [Zintl et al. 2024] [Zongo and Wei 2026] [Čečrdle 2015b] [čečrdle 2023]

Engine failure, cross-shafting and redundancy

What the X-18 lacked. Engine failure and the inoperative engine, asymmetric thrust, drive systems and cross-shafting, and the fault-tolerant control of multirotor and distributed vehicles. Fault tolerance has overtaken engine failure. 62 titles name a fault, the earliest dated one from 2007, with a median year of 2022, while the 44 that name an engine failure, an inoperative engine or one engine have a median year of 2018.

165 records. [Ahmadi Dastgerdi and Nabavi-Chashmi 2026] [Air Force Test Pilot School Edwards Afb Ca 1992] [Allel et al. 2023] [Alwi and Edwards 2013] [Ambroziak et al. 2023] [Ames and Fetty 2007] [Antonakis and Biannic 2024] [Arnold et al. 1987] [Avant et al. 2018] [Babin and Dattel 2021] [Babin et al. 2020] [Baldini et al. 2020] [Benischke and Thielecke 2015] [Berger et al. 2025] [Biber 2000a] [Biber 2000b] [Boskovic et al. 2007] [Bowen 1970] [Brinkman and Visser 2007] [Bucsek 1974] [Burova et al. 2025] [Burroughs 1965] [Carlson and Zhao 2002] [Carlson and Zhao 2004] [Carlson et al. 1999] [Casadei et al. 2019] [Castaldi et al. 2020] [Chaturvedi and Sahoo 2023] [Chen et al. 1995] [Chen et al. 1998] [Chung and Son 2020] [Cooper et al. 1966] [Córdoba G. 2007] [Daniel 1964] [Darmstadt et al. 2022] [Thipphavong] [Delisle and Takahashi 2018] [Diget et al. 2022] [Double Engine Failure 2002] [Du et al. 2024b] [Du et al. 2024a] [Duello 2002] [Engine Failure in Light 1980] [Falconì et al. 2018] [Fang 2022] [Frank and Rempe 2026] [Fuhrer et al. 2019] [Fulton et al. 2026] [Garzon Galindo et al. 2023] [Thomas and Malone] [Giribet et al. 2019] [Gonzalez-Guerrero et al. 2022] [Greuter and Zima 2012] [Grosveld 1983] [Guan and Shi 2019] [Guo and Wang 2010] [Hamadi] [Han and Pei 2026] [Hoffren and Raivio 2000] [Hoogreef and Soikkeli 2022] [Hou et al. 2025] [Hou et al. 2026b] [Hou et al. 2026a] [Huff 1988] [Hung and Dai 2025] [Immersion and Invariance Adaptive 2026] [Iseler et al. 1996] [Jiang et al. 2014] [Jing and Ma 2025a] [Johnson 1975] [Kang et al. 2023b] [Kapoor et al. 2012] [Kaufman and Van Train 1965] [Kirchner 1955] [Kobayashi and Takahashi 2011] [Krug et al. 2026] [Kuric et al. 2017] [Lai et al. 2026a] [Leclercq et al. 2012] [Lee et al. 2024a] [Leelaburanathanakul et al. 2021] [Leishman 1966] [Li et al. 2023c] [Li et al. 2025c] [Liao et al. 2023] [Liao et al. 2025a] [Liao et al. 2025b] [Liu and Xu 2026] [Luo et al. 2025] [Ma et al. 2025e] [Ma et al. 2025c] [Mack 1965] [Mage and Nikolic 2022] [Malaek and Alipour 2020] [Mancinelli et al. 2025] [Marks et al. 2012] [Massey et al. 2018] [Mazeh and Sahili 2019] [Mazeh et al. 2021] [McKay et al. 2022] [Mokotoff and Cinar 2026] [Mourning and Ghauri 2025] [Mousaei et al. 2022] [Neves et al. 2023] [Nieuwenhuijse and Franklin 1974] [Noh and Shin 2023] [Nunes et al. 2025a] [Oberschwendtner and Hornung 2024] [Ohgawara et al. 2020] [Overfield and Crawford 1967] [Park and Roh 2025] [Pei et al. 2025] [Reis et al. 1977] [Rich 1969b] [Rijal and Chakravarthy 2026] [Saied] [Saied et al. 2019b] [Saied et al. 2019a] [Saied et al. 2024] [Sanjuan et al. 2019] [Santos Martins Nunes and Su 2024] [Schacht-Rodrigue et al. 2019] [Seo and Kim 2019] [Silva-Martinez et al. 2015] [Slim et al. 2021] [Smith 1969] [Stevens et al. 1985] [Stewart 1987] [Stewart and Brown 1985] [Strampe and Klingauf 2026] [Swanke and Jahns 2021] [Swanke and Jahns 2022] [Swanke et al. 2021] [Thomas and Malone 2023] [Trustee 1976] [Unruh 1989] [Vey and Lunze 2016] [Wandini et al. 2016] [Wang 2003] [Wang and Zhang 2018] [Wang et al. 2017b] [Wang et al. 2020a] [Wang et al. 2022b] [Wang et al. 2026g] [Ward et al. 1999] [Wen et al. 2023] [Whelchel et al. 2022] [Willis 1980] [Willis 1981] [Xia et al. 2022] [Xia et al. 2023] [Xiao et al. 2018b] [Xie et al. 2020a] [Xu and Zhang 2025] [Yan and Chen 2019] [Yang et al. 2020] [Yu et al. 2024] [Yuanqing et al. 2014] [Zelina and Prazenica 2024] [Zhang et al. 2024a] [Zhang et al. 2024b] [Zhao et al. 1995] [Zhao et al. 2024f] [Zhao et al. 2025b] [Zou 2017]

Wind tunnel testing and the correlation with flight

The ground prediction. Wind tunnel testing of powered-lift and rotorcraft models, wall and scale effects, free-flight and full-scale tests, and the correlation of tunnel with flight.

133 records. [Jacob da Motta 2020] [Abdessameud and Tayebi 2010a] [Abdulrahim 2020] [Balch 1978] [Simmons] [Simmons] [Simmons et al] [Simmons et al] [Simmons 2023a] [Blackwell and Frederickson 1981] [Bland and Konsewicz 1976] [Boeing Co Morton Pa Vertol Div 1961b] [Boeing Vertol Co Philadelphia Pa 1974] [Brand et al. 1989] [Brown and Duhon 1965] [Bruce 2009] [Campbell and Quinn 1973] [Corsiglia et al. 1979] [Curtiss et al. 1961] [Danis] [Deel et al. 1972] [Dooley and Yeary 1979] [Reda et al. 2017] [Ekquist 1965] [Experimental Investigation of Synthetic 2023] [Figueira et al. 2025] [Flight Test 1979] [Frey et al. 2024] [Fukami et al. 2004] [Gallington and Miller 1970] [Gebert et al. 2000] [Ghanchi and Gururajan 2026] [Ghazi 1993] [Glezer 2009] [Glezer 2012] [González Mendoza 2026b] [González Mendoza 2026a] [Grafton et al. 1974] [Güngör et al. 2024] [Gustafson et al. 1960] [Haleem 2023] [Hall 1968] [Hassell 1976] [Heyson 1973] [Heyson 1974] [Holway 1966] [Hughes and Wernicke 1974] [Jaffe 1972] [Foster et al. 2020] [Jones 1971a] [Littell and Putnam] [Littell et al] [Karli et al. 2024] [Kelly 1972] [Kelly 1973] [Kelly and Smaus 1952] [Kirby 1954b] [Kulkarni et al. 2022] [LaForge and Rohtert 1970] [Landman et al. 1999] [Lange et al. 1946] [Lavi 1967a] [Lebacqz and Radford 1978] [Lebacqz and Radford 1979] [Lechniak 2018] [Ledford 2007] [Lee et al. 2026f] [Lemnios et al. 1976] [Lockheed-California Co Burbank 1964] [Loughran et al. 2024] [Lovell 1953] [Lovell 1954] [Maier et al. 1996] [Mangum 1965] [Mason 2013] [McKinney and Newsom 1962] [McKillip 1996] [McWherter 1961] [Milić et al. 2025] [Moser 1961] [Mumford et al. 2023] [Murphy et al. 2021a] [Murphy et al. 2021b] [Mychalowycz and Panda 1996] [Nagel and Thomas 1965] [Ossyra et al. 2025] [Paglino and Beno 1971] [Pallister et al. 1992] [Philipsen 2021] [Platou 1968] [Purser and Spear 1947] [Queijo et al. 1953] [Raagaard] [Rabbott et al. 1966] [Rae and Shojiro 1977] [Report No. 459 1933] [Report No. 515 Full-Scale 1935] [Riddle et al. 1981] [Roberts and Tayebi 2011] [Rogers et al. 1969] [Rooney et al. 1977] [Roth 1991] [Conley and Shirazi] [Saripalli and Kroutil 1985] [Sarker et al. 2026] [Satran 1986] [Shanmugam et al. 2025] [Sigl and Strawn 1989] [Simmons and Busan 2024] [Simmons et al. 2026a] [Smith 1959] [Smith 1961] [Smith et al. 1990] [Smith et al. 2000] [Sopher and Kottapalli 1982] [Squires and Warmbrodt 1983] [Staley et al. 1979] [Stange 1959] [Sutton et al. 1982] [Symington 1940] [Thapa et al. 2026] [Theron et al. 2006] [Tomio et al. 1993] [Traybar 1970] [Wang] [Wang et al. 2022a] [Wang et al. 2022c] [Warner and Rogers 2019] [Weber 1973] [Wright and Aubert 2014] [Yamauchi et al. 2012] [Zierten and Rettie 1977] [Öznalbant and Kavsaoglu 2015]

Descent and the vortex ring state

The half of the flight that closes the corridor. Descent, steep approach, autorotation and the vortex ring state. 80 titles name the vortex ring, and 58 of the 80 dated ones are from 2010 or later.

130 records. [Abrego et al. 2001] [Abrego et al. 2002] [Agbormbai et al. 2021] [Ahlin and Brown 2007] [Ahlin and Brown 2009] [Amoozgar and Huang 2026] [Ananthan et al. 2002] [Andrien and Talaeizadeh 2022] [Anikin 2002] [Avionics 1969b] [Azuma and Obata 1968] [Azuma et al. 1966] [Barakos et al. 2026] [Batther et al. 2024] [Betzina 2001] [ONERA et al. 2025] [Brand et al. 2007a] [Brand et al. 2007b] [Bucherelli et al. 2026] [Burke and Chevalier 1971] [Castles and Gray 1951] [Celi and Ribera 2007] [Chae et al. 2022] [Charles 1975] [Chen and Prasad 2005b] [Chen and Prasad 2005a] [Chenglong et al. 2015] [Clymer and Flora 1973] [Cocco et al. 2024] [Boyd et al] [Dietz et al. 2006] [Dziubinski and Stalewski 2007] [Efimov and Chernigin 2022] [Feng et al. 2026a] [Fitch et al. 1970] [Gao et al. 2024b] [Gasparovic et al. 2016] [Gessow 1950] [Grzegorczyk 2013] [Hahn et al. 2025] [He et al. 2000] [Heyson 1975] [Hickey 1956] [Hoinville and Renaud 2007] [Ignatkin et al. 2018] [Ignatkin et al. 2019] [Inoue et al. 1997] [Isbono 2026] [Janakiram 1979] [Jeong et al. 2024c] [Jeong et al. 2024b] [Jeong et al. 2026] [Johnson 1977] [Johnson 2004] [Johnson 2005] [Kamiya et al. 2024] [Karpatne et al. 2014] [Kesselring 1969] [Kholosi et al. 2026] [Klein and Nicks 1998] [Lebacqz and Aiken 1975a] [Lebacqz and Aiken 1975b] [Lee 1985] [Lee et al. 2025e] [Lu et al. 2023] [Lukianov 2021] [Ma et al. 2026] [Macit et al. 2025] [Makeev 2026a] [Makeev et al. 2021c] [Makeev et al. 2021b] [Makeev et al. 2022] [Makeev et al. 2024] [Marshall et al. 2024] [McAlister et al. 2000] [McQuaid 2021] [McQuaid et al. 2020] [Mihaila and Fuiorea 2025] [Mori et al. 2024b] [Mori et al. 2024a] [Mori et al. 2025] [Peters and Chen 1982] [Peters and Wasileski 2000] [Pickles et al. 2023b] [Pickles et al. 2023a] [Prasad and Basset 2002] [Prasad and Chen 2006] [Qi et al. 2025a] [Yu et al. 2014] [Research on Vortex Ring 2015] [Rezaei et al. 2024] [Richardson et al. 2005] [Richardson et al. 2006] [Savas¸ et al 2009] [Savino et al. 2025] [Scheglova 2012] [Scott 1969] [Sheng and Zhao 2025] [Sheridan et al. 1982] [Shetty and Selig 2011] [Stack 2004] [Stack et al. 2005] [Stalewski and Surmacz 2019] [Stalewski and Surmacz 2020] [Suggs 1969] [Sullivan 1973] [Sun et al. 2024b] [Surmacz and Kowaleczko 2016] [Surmacz et al. 2016] [Talaeizadeh et al. 2020] [Talaeizadeh et al. 2021] [Talbot and Schroers 1978] [Tolentino 2022] [Toropov and Stepanov 2016] [Veismann et al. 2023] [Vortex Ring Model Applied 2026a] [Vortex Ring Model Applied 2026b] [Wang et al. 2025a] [Washizu et al. 1965] [Wen et al. 2022] [Wilson and Prazenica 2020] [Wolkovitch and Hoffman 1971] [Xu et al. 2024b] [Yan et al. 2012] [Yeates 1958] [Young 2010] [Yurt et al. 2026] [Zalewski 2016] [Zeng et al. 2024] [Zhou et al. 2026f]

The atmosphere and the flight condition

The medium, named rather than assumed. Standard atmosphere tables and models. The density at ten thousand feet that sets the roll authority in How Much Asymmetry That Took is taken from the standard atmosphere, so the literature that defines it belongs in the survey.

Computational methods, surrogates and autonomy

The current toolset. Computational fluid dynamics, surrogate and reduced-order models, machine learning, optimisation and autonomy, where no more specific cluster claims the title.

71 records. [Ailon 2009] [Amer 1965] [Barakos 2014] [Bhandari et al. 2023] [Boeing Co Morton Pa Vertol Div 1956a] [Boeing Co Morton Pa Vertol Div 1956b] [Branson 1994] [Cardullo et al. 1985] [Chawla and Vandalsem 1993] [Chen et al. 2021c] [Chopra 2013] [Costantini 2023] [Curtiss 1965a] [Daffer and Rogers 1973] [Davis 1974] [Feldman 1956] [Fernandez et al. 2026] [Friedmann et al. 2011] [Gopejenko et al. 2026] [Grotz 1961] [Hagen et al. 1977] [Han et al. 2026] [Hays and Schultz 2025] [Hoffert 1964] [Holzhauser et al. 1971] [Holzhauser et al. 1972] [Jain et al. 2010] [Janus et al. 1996] [Jou and Metcalfe 1984] [Joy and Simonds 1955] [Kanishk Mahaveer Jain 2025] [Kathiresan et al. 2024] [Liu et al. 2016] [Liu et al. 2025e] [Lopez and Biancolini 2025] [Louie 2025] [Luu 2025] [Macdonald] [McCormick 2002] [McIntire and Monson 1970] [McTavish] [Merrick 1982] [Nugroho et al. 2022] [O’Donnell et al. 1988] [Olson 1967] [Papayanopoulos et al. 2019] [Pour Razzaghi et al. 2025] [Pour Razzaghi et al. 2026] [Prieto et al. 2023] [Reber 1981] [Reel and Baltadjiev 2018] [Saito and Kurose 2024] [Saito and Kurose 2025] [Sawata and Dinu 2025] [Sethi and Ahlawat 2022a] [Sethi and Ahlawat 2022b] [Sethi et al. 2021] [Simpson 1969] [Sivaramakrishnan et al. 2024] [Truong et al. 2023] [Tugnoli et al. 2021] [Van Dalsem et al. 1990] [Vandalsem et al. 1989] [Wang et al. 2026i] [Yan and Shi 2025] [Yin et al. 2023] [Yu and Kwon 2017] [Zafirov 2013] [Zhang et al. 2009] [Zhao et al. 2025c] [Zhou et al. 2019]

Rotor and airframe structures, dynamics and reliability

What carries the loads. The structures, dynamics, aeroelasticity, icing and reliability of rotors and VTOL airframes, where no more specific cluster claims the title.

70 records. [Aditiya et al. 2022] [Alexander 2026] [Anthony and Habashi 2021] [Artis 1975] [Avera 2019] [Barton 1966] [Bloomfield 1959] [Boeing Vertol Co Philadelphia Pa 1977a] [Cardinale 1969] [Cardinale et al. 1969] [Conley 1966] [Cotton 1967] [Curtiss 1972] [Dean 1979] [Desjardins and Sankewitsch 1981] [Dixon 1980] [Dooley and Ferguson 1978] [Fagan 1967] [Faiz 1973] [Falcone et al. 1974] [Fatra et al. 2024] [Fernandez et al. 2023a] [Freidmann 2001] [Friedmann 1990] [Friedmann 2000] [Fries 2001] [Geier and Powell 1961] [Haley and Avery 1964] [Hansen 1983] [Harradine 1977] [Hasbrook 1957] [Heffley and Hardy 1978] [Hopkins and Kunz 1988] [Itt Systems Rome Ny 1987] [Kato and Yamane 1979] [Keith-Lucas 1959] [Kolwey 1999] [LaRue and Rivera 2026] [Levenetz 1973] [Lim et al. 2014] [Liu et al. 2024b] [Lytwyn 1980] [Mayerjak 1978] [Minsk 1970] [Peters 1980] [Pradana et al. 2021] [Qi et al. 2026] [Rege et al. 2015] [Rich 1969a] [Santoso and Hariyanto 2022] [Conley 2023] [Schmidt 1963] [Shin and Cesnik 2001] [Sloman 2019] [Sloman and Scott 2018] [Smith and Brooks 1986] [Swingle 1995] [Tauke and Bordignon 2002] [Thompson 1980] [Venkatesan and Friedmann 1987] [Wang et al. 2013a] [Ward 1970] [Wehnert et al. 1977] [Werner 1973] [Wijaya et al. 2023] [Wilkie et al. 1999] [Wokanubun et al. 2023] [Wynn 2026] [Yeates 1964] [Yoon 2025]

Powerplants, turboprops and jet-lift propulsion

What turns the propellers. Turboprop, turboshaft and jet-lift powerplants, lift engines, inlets and exhaust, where no more specific cluster claims the title.

50 records. [A Vectored-Engine-over-Wing Propulsive-Lift Concept 1976] [Anderson and Petersen 1977] [Balke 1970a] [Balke 1970b] [Banach and Reynolds 1981] [Barrett 1952] [Boschma 1998] [Ciepluch et al. 1979] [Christie et al. 2016] [Cook 1993] [Darling et al. 1970] [Duan 2022] [Fasching and Kutney 1964] [Flemming 1968] [Giurca 2014] [Giurca 2025] [Hewson 1959] [Hiller Aircraft Corp Palo Alto Ca 1965a] [Hiller Aircraft Corp Palo Alto Ca 1965e] [Hiller Aircraft Corp Palo Alto Ca 1965f] [Hiller Aircraft Corp Palo Alto Ca 1965d] [Hiller Aircraft Corp Palo Alto Ca 1965b] [Hiller Aircraft Corp Palo Alto Ca 1965c] [Hirschkron et al. 1979b] [Hirschkron et al. 1979a] [Hooker 1956] [Kleckner 1973] [Lepicovsky 2008] [Luidens 1976] [Mock 1951] [Moellmann and O’Connor 1967] [Nishimura 1980] [O’Malley 1959] [Quiet Powered-Lift Propulsion 1979] [Quigley and Franklin 1977] [Rasmussen 1960] [Rice 1955] [Richard 1995] [Saboe 1963] [Scott 2009] [Steinetz et al. 1986] [Stewart 1981] [Stoten 1983] [Suydam 1970] [van Holten and Pavel 2010] [Vance 1973] [Vaughn 1970] [Wang and Zhou 2026] [Wynn 1982] [Zucrow 1949]

Other rotorcraft and powered-lift literature

The residual, reported and not hidden. Powered-lift and rotorcraft literature that belongs to no other cluster, including programme overviews and conference proceedings, histories of vertical take-off development, configuration concepts and applications.

146 records. [Alvarez muñoz] [Aláez Gómez] [Army Aviation Board Fort Rucker Al 1964] [AV-95 Sun Devil 1996] [Axten et al. 2025] [Bardera et al. 2020] [Barich 2002] [Barkley and Weaver 1977] [Bartie 2021] [Bauer 1963] [Berlin et al. 2025] [Bertelsen 2018] [Bi et al. 1989] [Binkley 1986] [Boeing Co Morton Pa Vertol Div 1961d] [Boeing Co Morton Pa Vertol Div 1961c] [Boeing Co Morton Pa Vertol Div 1961a] [Boeing Co Morton Pa Vertol Div 1965] [Boeing Vertol Co Philadelphia Pa 1980] [Bonassar and Lucas 1980] [Bright 1966] [Brogan et al. 1961] [Burks 1989] [Campbell 1976] [Carlson 2014] [Chana 2002] [Chen 1981] [Cheney 1969] [Corgiat et al. 1993] [Cornes 2019] [Duraisamy et al. 2024] [Durbin et al. 2014] [Ellis et al. 1976] [Emerson et al. 2023] [Englar 1987b] [Englar and Bushnell 2006] [Englar et al. 1986] [Euan Hooper 1975] [Filippone 2006] [Flaig 1977] [Flater 1993] [LaForge et al. 1990] [Foulke 1965] [Fradenburgh 1961] [Freeman and Aboelezz 2026] [Gamon 1988] [Garren et al. 1970b] [Gessow 1993] [Goldberg 2023] [Gomez Ariza] [Goto and Miwa 2017] [Gowanlock 2025] [Grady and Lindenbaum 2000] [Grina 1975] [Ground Tests of Piasecki 1958] [Hafer and Sachs 1982] [Harned and Head 1965] [Hartley et al. 1965] [Head 2025] [Hellyar 1970] [Hellyar 1971] [Hirschberg 2023] [Howze 1969] [Idachaba 2014] [Idachaba 2016] [Janetzko et al. 2026] [Johnson 1980] [Karimatun Nisa’ et al. 2026] [Kidwell and Wray 1964] [Klemin 1940] [Komerath et al. 1985a] [Laatsch 2003] [LaBiche 2003] [Lan 1974] [Lightfoot 1968] [Loh and Jacob 2014] [Loth and Funk 1987] [Love 1993] [Ludi 1966] [Boctor et al. 1978] [Madden 1967] [McSwain et al. 2017] [McVeigh and McHugh 1982] [Mearns 2025] [Melton and Hall 1968] [Moller 1998] [Moore 2015] [Multi-Rotors 2015] [Nagata and Buss 1969] [Nicholson and lowry 1966] [Pan et al. 2025] [Parlier 1983] [Patkar et al. 2013] [Patterson et al. 1968] [Petrolo et al. 2014] [Pines 2014] [Pogorzelski and Cable 2001] [Pridgen 2013] [Roberts 1978] [Roberts 1989] [Roberts and Imlay 1992] [Romero and Sartorius 2013] [Saj et al. 2023] [Salkind 1973] [Sarames 1967] [Sayuti et al. 2022] [Schaefer 2016] [Schrage and McKeithan 1989] [Schroers and Antoniou 1966] [Schwaiger and Wills 2016] [Schwoerer 1978] [Scott 1991] [Seckel 1964] [Serrano 2018] [Severinghaus and Kaniarz 2015] [Shefrin and Hill 1974] [Sisák and Škultéty 2020] [Stanzione 2025b] [Stanzione 2026] [Stanzione and Schrage 2023] [Stanzione and Schrage 2024] [Sunada et al. 2003] [Suppes and Suppes 2026] [Takita and Kashitani 2016] [Taylor 1958b] [Tung and DuWaldt 1970] [Turkmen and Altug 2020] [Uehara et al. 2019] [Unsworth and Sutton 1984] [Utley et al. 1972] [Vanderborght 2015] [Virasak 2022] [Virasak 2021] [VTOL 1969] [VTOL BOOSTER 1961] [Wang et al. 2019c] [Wardwell and Sandlin 1988] [Wardwell et al. 1986] [Wax and Tocci 1966] [Westcott et al. 2023] [Whitfield and Blackburn 1965] [Willard 1968] [Williams et al. 1976] [Yang and Wang 2017] [Yoeli 2003] [Yukita et al. 2024]

Where the Framing Breaks Down

It assumes a stall angle. The 15 degree figure used throughout is an assumption, and every corridor and descent figure scales with it directly. A thick wing with leading edge devices stalls later, and the fraction of the conversion spent stalled moves with it.

It treats the slipstream as uniform. Momentum theory gives an average. A real slipstream is non-uniform and differently deflected across the span, and the immersed wing does not see one dynamic pressure. Kirby notes that the simple resolution of velocities is the one obtained with counterrotating propellers, whose slipstream carries no rotation, so the X-18’s contra-rotating propellers are the case it describes best and the swirl of a single-rotation propeller is a lesser error here.

It uses a single representative contraction factor. The 0.85 is a judgement, and the immersed fraction ranges from 47 to 67 percent across defensible choices, a wide band on the article’s central quantity.

It treats the final flight as an aerodynamic event. In the encyclopaedia entry it was a propeller pitch control failure and in the inventory an engine failure. The aerodynamics explain why the consequence was severe and do not explain why the failure occurred, and no public account of the fault exists among the sources cited here.

The Source Base

The survey rests on 7,772 research records assembled from Crossref, the NASA Technical Reports Server and the Defense Technical Information Center, of which 1,561 are report primaries, being 20.1 percent, by the identifier rule set out under The Definition of Primary. 7,513 of the records carry a year, with a median of 2013.

Unlike the two preceding articles, this subject has a real technical literature. The tilt-wing was studied intensively by the National Advisory Committee for Aeronautics and its successor, and the configuration’s design considerations, wind tunnel behaviour, slipstream interference, and handling qualities are all documented in primary sources.

What is scarce is documentation of this aircraft. No report in the Technical Reports Server of the National Aeronautics and Space Administration carries the designation in its title, and no X-18 report appears among the Defense Technical Information Center records registered with Crossref. The aircraft’s own engineering record is the Hiller report series in the Lindenbaum collection, which is on paper only and contains no catalogued report of flight results. The closest published primary documents are Schade’s ground-effect measurements on an X-18 model, which cite full-scale X-18 tests, in Conference on V/Stol Aircraft 1960, Conference on V/Stol Aircraft a Co, and the Air Force history. So the pattern is the inverse of the X-16 and X-17 articles, where the question had a literature and the vehicle did not. Here the configuration has a literature and the individual airframe does not, which is a milder version of the same difficulty.

One retrospective paper on the aircraft itself is on record. Nichols 1990 is a conference paper of the American Institute of Aeronautics and Astronautics on the lessons learned from the Hiller X-18. Its text is not drawn on here, so the dimensions, dates and flight record above rest on the inventory, the encyclopaedia entry and the Air Force history.

Every dimension and weight is from secondary compilation, and the one weight an official source states independently, the Air Force history’s sixteen and a half tons, agrees with it. The sources disagree on three points, the first flight date of 20 or 24 November 1959, whether the last flight ended with an engine failure or a propeller pitch control problem, and whether the aircraft’s scrapping is documented.

The Shape of the Reference Base

Of the 7,513 dated research records, 4,510 predate 2019 and 3,003 do not. The distribution runs 317 documents from before 1960, 1,351 from the 1960s and 1970s, 1,189 from the 1980s and 1990s, 1,653 from 2000 to 2018, and 3,003 from 2019 onward. The contemporary share is large because the configuration actually returned, so surveying the present state of it is surveying a live engineering field rather than an epilogue.

The single most apposite document in the article is the measurement of the descent capability of two-propeller tilt-wing configurations in Hassell and Kirby 1966, which is the X-18’s exact arrangement addressing the X-18’s exact difficulty.

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 it is a NASA Technical Reports Server url or carries a digital object identifier under the 10.21236 prefix, which Crossref registers for Defense Technical Information Center reports. 1,053 of the records are reports-server urls, and the NACA and NASA tilt-wing, deflected-slipstream, descent and V/STOL handling-qualities reports on which the period argument rests are reached that way, so the rule counts them.

The rule does not reach the journal and conference literature of the American Institute of Aeronautics and Astronautics, abbreviated AIAA. 2,544 of the records carry its 10.2514 prefix, among them the retrospective paper on the X-18 and design and flight test papers written by the people who built the vehicles they describe. The Hiller company reports in the Lindenbaum collection are on paper only and are not in the survey at all. 20.1 percent is therefore a lower bound on how much of this survey is first-hand.

Thin Subjects

Eight 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 read as a space.

Subject	Title terms counted	Records
the immersed fraction of the span	immersed, immersion	4
the contraction of the slipstream	contraction, contracting, contracted	4
the local angle of attack of a blown wing	local angle of attack, local incidence, effective angle of attack	0
cross-shafting and interconnected drives	cross shaft, interconnect	6
asymmetric and differential thrust	asymmetric thrust, thrust asymmetry, asymmetric power, differential thrust, differential propeller thrust	7
the hover figure of merit	figure of merit	1
the helical tip Mach number	tip mach, helical tip	8
density altitude and roll authority	density altitude	1

The keystone has no literature under its own name. The four titles that carry the word immersed or immersion concern immersion and invariance control, immersed-boundary numerical methods and immersion cooling, and none concerns a wing in a slipstream. The immersed fraction is studied as the slipstream and as propeller and wing interaction in the clusters above, and the article’s own figure of 57 percent stands on the geometry and the contraction factor shown in How Much of the Wing Is Immersed.

The contraction of the slipstream appears in four titles, Conway 1998, Iwasaki 1959, Sparks and Miley 1983 and Theodorsen 1944, which is why the contraction range of 0.707 to 1.0 is taken from momentum theory and the 0.85 is reported as a judgement. No title names the local angle of attack of a blown wing, so the relation in The Relation That Makes the Configuration Work stands on the resolution of velocities shown there and on Kirby’s period treatment of it.

Cross-shafting has five titles of its own, two of them on the landing reliability of V/STOL aircraft, Willis 1980 and Willis 1981, and the remaining title that carries interconnection concerns an electrical grid. The figure of merit appears in one title, on meshing rotors, so the check of 0.674 rests on momentum theory and the published weight and power, and density altitude appears in one, Strand and Ennis 2012, so the 26 percent loss of roll authority at ten thousand feet rests on the standard atmosphere. The helical tip Mach number is a noise subject in these titles, with seven of its eight records on noise or aural detection.

What the Survey Admits

Every research title has been read for relevance, and a record is admitted only when a person reading its title finds it on this article’s subject, which is a tilted wing in a propeller slipstream and everything the article dimensions to decide whether a conversion exists, from the actuator disc and the propeller at low advance ratio, through the stall of the wing and the devices that delay it, the corridor, descent and the vortex ring state, hover control and handling qualities and engine failure, to the ground environment and the electric successors that inherited the configuration. The tilt-rotor, deflected-slipstream, jet-lift and helicopter literatures are admitted where they treat a quantity the article computes.

Many words this subject depends on also name something else, and a record that shares only such a word is excluded. Propeller also names the screw of a ship, the runner of a hydro turbine, a current meter, a ventilating fan and a microcontroller, and controllable pitch is very largely a marine subject. Slipstream also names a form of fiction, a mode of program execution and a side stream in a coal gasification plant. Outwash is also a glacial landform and its aquifers, hot gas ingestion is also the ingestion of hot gas into the rim cavity of a turbine, and ground effect machines are air-cushion vehicles. Transition is also the laminar-turbulent transition of a boundary layer, stol is a chair in Danish and a round table in Croatian, the osprey is also a bird and Hiller is also the name of composers, artists and chemists. Standard atmosphere also names radio refraction, room acoustics, the greenhouse effect and the conditioning of test specimens. High angle of attack also names missile aerodynamics, vortex ring also names structures in a methane diffusion flame, disc loading also names the loading of the jaw joint, and certification also names the qualification of welding personnel, nursing credentials and halal certification. The wind tunnel also tests cars, trucks and buildings, and the correlation of tunnel with flight for fixed-wing aircraft outside powered lift is a different problem. Correction, erratum, corrigendum and retraction notices, figure, table and supplementary-file records and journal front matter are excluded as well, because a survey counts research works and those are parts of works or editorial events rather than works. Reviews of books, dictionary and other reference entries of two pages or fewer, news and other notices, and a second deposit of a document already in the survey are not admitted either, while an authored encyclopedia article of more than two pages and a textbook chapter are research works and stay.

Some records of doubtful relevance are kept. Wing-in-ground-effect craft and their theory, laboratory hover rigs, and actuator disc theory developed for wind turbines are kept for the ground effect and momentum theory they share with this article. Fixed-wing climb and descent, continuous descent in air traffic management, the fuel flow of an airliner in descent, a vortex ring generated by a microramp and a vortex-ring method for a flapping wing rotor are kept for the descent section, research issues in the transition to free flight and a state transition graph for trajectory optimisation for the transition section, and turbine vane cooling with one engine inoperative for the engine-out section. Aviation certification outside powered lift, machine learning prediction of aerodynamics outside powered lift, the communications and cybersecurity of urban air mobility, the jet-flap interaction noise of airliners, the management of the V-22 programme and propeller titles whose medium the title does not state are kept as the neighbouring field of a section of this article. A reader may weigh each accordingly.

Because every title has been read, the off-topic share that remains is a matter of reading judgement. The largest class removed is the marine propeller, because the propeller of a ship shares the vocabulary of pitch, thrust, wake and contra-rotation with the propeller of an aircraft.

Epistemic State

Historical fact. The X-18 was built from a Chase YC-122C fuselage with Allison T40 turboprops taken from the XFY-1 and XFV-1 programmes and a Westinghouse J34 in the tail for pitch control. Proposed in 1954, designated in October 1957 and unveiled on 8 December 1958 under Air Force funding. First flight 20 November 1959 in the inventory and 24 November 1959 in the Air Force history, twenty flights, last flight July 1961, fastest 253 miles an hour and highest 35,300 feet. The last flight ended in one account with a propeller pitch control problem during an attempted conversion at ten thousand feet and a spin from which the crew recovered, and in the other with an engine failure. No source records a hover or a completed conversion. The programme was cancelled in January 1964 and the aircraft was cut up for scrap in one account and is generally assumed to have been scrapped in the other. The engines were not cross-linked. The XC-142 followed with four propellers and engines linked so that one could turn all four.

Engineering analysis, reproducible from the stated inputs. The local angle of attack relation and its consequence that the immersed panel sits at exactly zero incidence at zero forward speed. The maximum tolerable tilt from 90 degrees at ten metres per second to 30 at sixty. The conversion corridor, which exists at every speed with a margin between 12.6 and 38.0 degrees of tilt. The descent rates that close it, from 284 feet per minute at the slow end to 1,349 at the fast end, which are upper bounds because the relation holds the slipstream fixed while a real descent reduces power. The induced velocity falling from 40.05 to 24.71 metres per second across the conversion while slipstream dynamic pressure rises from 2,210 to 5,772 pascals. The advance ratio range of 0 to 1.12 and the helical tip Mach number of 0.844. The aspect ratio of 4.364 against a quoted 4.36. The immersed span fraction of 66.7 percent uncontracted, 47.1 fully contracted, and about 57 at a representative factor. The stalled fraction of the conversion at 83.3 percent. The induced velocity of 40.05 metres per second, disc loading of 82.1 pounds per square foot, and slipstream dynamic pressure equivalent to 117 knots. The immersed lift fractions. The hover power of 7,883 ideal horsepower and the implied figure of merit of 0.674. The engine-out rolling moment of 268 kilonewton metres and the aileron fractions. The tolerable thrust asymmetry figures and the 26 percent authority loss at ten thousand feet. The pitch jet crossover at 59 knots.

Inference, and clearly labelled. That the outer wing being stalled is the configuration’s defining problem is an inference from the geometry and a stall angle, supported by the period literature on tilt-wing stall but not derived from X-18 flight data. That a corridor exists at every speed rests on a crude lift model in which the immersed panel is given a linear lift curve to its stall and the outer panel a constant stalled lift coefficient of 0.6. The shape of the result is robust and the individual margins are not. That the XC-142’s four propellers and cross-shafting were responses to the X-18’s specific failures is an inference from the design changes and their evident purpose.

Assumed values. No source states the following, and each is an assumption of this article. The stall angle of 15 degrees, the contraction factor of 0.85, the part-developed slipstream of 1.5 times the induced velocity at the wing, the immersed panel’s lift curve and the stalled outer-panel lift coefficient of 0.6, the propeller’s lateral station at a quarter span, the aileron effectiveness of 0.08 per radian at 20 degrees of deflection, the pitch jet’s arm of 8.64 metres and deflected thrust of a thousand pounds force, the elevator effectiveness of 1.2 per radian at 20 degrees of deflection, and the propeller speed of 1,100 revolutions per minute.

What the record does not settle. Whether the last flight ended with a propeller pitch control failure or an engine failure, and what caused it. Whether the scrapping of the aircraft is documented. Whether the X-18 would have converted successfully had it not been grounded. What immersed fraction the designers believed they had. Whether the aircraft was ever close to a hover.

The pitch jet crossover rests on an assumed elevator effectiveness. The crossover of 59 knots uses an elevator effectiveness coefficient of about 1.2 per radian, the correct order for an aircraft of this class. The crossover speed varies as the inverse square root of that coefficient, so a value of 0.02 per radian would put it at 454 knots, which is implausible for such an aircraft.

What the contemporary survey changes. The contemporary survey is organised by field, and its central observation revises the premise of the article and does not merely extend it. The keystone was dissolved rather than solved. This article spends its length computing an immersed fraction whose value was set by the X-18 having exactly two propellers, and nothing about a tilt-wing requires two. Each propeller needed a turboprop and a gearbox of its own, and the X-18 was built around two surplus turboprops. Electric propulsion breaks that tie between propeller and engine, and a distributed arrangement immerses essentially the whole span. The quantity this article is built on goes to unity, and the problem is deleted without being answered.

Information postdating the editorial date. The contemporary literature section is written from current knowledge.

Out of Scope

The XC-142 programme deserves its own treatment and gets a paragraph here. The V-22 and the tilt-rotor line generally are named as the surviving alternative and not analysed. The detailed aerodynamics of swirl in a propeller slipstream are cited rather than derived. No attempt is made to reconstruct the X-18’s flight envelope. The vortex ring state, which is the related descent hazard for a lifting rotor and which a tilt-wing can also meet, is not treated.

Conclusion

The X-18 asked whether a wing could be tilted through ninety degrees and flown all the way. It never found out, and the arithmetic of its geometry explains why.

Two sixteen-foot propellers on a forty-eight-foot wing immerse a little over half of it. The immersed part flies at an equivalent 117 knots while the aircraft stands still. The rest of the wing is stalled for five sixths of the conversion, and no wing design fixes that, because the wing is pointed away from the air by construction.

That would have been survivable with margin elsewhere. There was none. The ailerons supply under one percent of the rolling moment an engine failure produces in hover, the engines were not cross-linked so an engine failure was available to produce it, and a few percent of thrust asymmetry exhausts the roll control during conversion. When a propeller pitch control fault, or in the other account an engine failure, duly appeared, the aircraft departed.

The configuration was not wrong and this aeroplane was under-equipped for it, and the corridor calculation demonstrates it. A usable tilt margin exists at every speed, between twelve and thirty-eight degrees, so the tilt-wing is a sound idea that this particular aeroplane could not exploit. The XC-142 answered with twice the propellers along the wing and engines linked so that one could turn them all, in effect a list of the X-18’s deficiencies written as a specification. The X-18’s contribution was to establish, expensively and at the edge of a fatal accident, what the minimum version of the idea could not do.

Equations

This section collects the 33 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 33, 23 are established and 10 are bespoke. Published figures are in pounds and feet while the momentum theory and control calculations are in SI units at sea-level density unless a line states another altitude, and $A$ is the aspect ratio in the consistency check but the propeller disc area thereafter, while $n$ is the number of propellers in the disc loading and power relations but the propeller rotational speed in the advance ratio and tip Mach number.

Equation 1, Maximum Weight From the Official Tonnage. The sixteen and a half tons the Air Force history gives, read as short tons of 2,000 pounds, reproduce the published maximum weight. official history of the Air Force’s 16th Special Operations Wing

\[W = 16.5 \times 2{,}000 = 33{,}000\ \text{lb} \tag{1}\]

Equation 2, Aspect Ratio From Published Dimensions. The aspect ratio is the square of the published span divided by the published wing area. Hiller X-18

\[A = \frac{b^{2}}{S} = \frac{48^{2}}{528} = 4.364 \tag{2}\]

Equation 3, Wing Loading at Maximum Weight. The wing loading is the published maximum weight divided by the published wing area. Hiller X-18

\[\frac{W}{S} = \frac{33{,}000}{528} = 62.50\ \text{lb/ft}^{2} \tag{3}\]

Equation 4, Bespoke Raw Immersed Span Fraction. The article defines the immersed fraction as two propeller diameters over the span, an upper bound that ignores slipstream contraction.

\[f_{\text{raw}} = \frac{n D_p}{b} = \frac{2 \times 16}{48} = 0.667 \tag{4}\]

Equation 5, Fully Contracted Slipstream Diameter. Momentum theory halves the slipstream area far behind the disc, so the published propeller diameter contracts by the square root of two.

\[D_{\text{slip}} = \frac{D_p}{\sqrt{2}} = \frac{4.877}{1.414} = 3.448\ \text{m} = 11.31\ \text{ft} \tag{5}\]

Equation 6, Bespoke Outer Panel Angle of Attack. With the fuselage held level as the article assumes, the un-immersed panel meets the freestream at the wing tilt angle.

\[\alpha_{\text{free}} = i_w \tag{6}\]

Equation 7, Bespoke Fraction of the Conversion With the Outer Panel Stalled. The stalled fraction rests on an assumed stall angle of 15 degrees and a conversion taken to run from zero to ninety degrees of tilt.

\[\frac{90 - 15}{90} = 0.833 \tag{7}\]

Equation 8, Actuator Disc Induced and Slipstream Velocities. Momentum theory for a disc at static thrust gives the induced velocity and a fully developed slipstream at twice that value.

\[v_i = \sqrt{\frac{T}{2 \rho A}}, \qquad v_s = 2 v_i \tag{8}\]

Equation 9, Thrust per Propeller in Hover. In hover at maximum weight each of the two propellers carries half the weight.

\[T = \frac{33{,}000}{2} = 16{,}500\ \text{lbf} = 73.4\ \text{kN} \tag{9}\]

Equation 10, Disc Loading in Hover. The disc loading is the thrust per propeller divided by the disc area of a 16 foot propeller.

\[\frac{T}{A} = \frac{73{,}400}{18.68} = 3{,}929\ \text{N/m}^{2} = 82.1\ \text{lb/ft}^{2} \tag{10}\]

Equation 11, Static Induced Velocity. The actuator disc relation at sea-level density gives an induced velocity of about 40 metres per second.

\[v_i = \sqrt{\frac{73{,}400}{2 \times 1.225 \times 18.68}} = 40.05\ \text{m/s} \tag{11}\]

Equation 12, Bespoke Slipstream Dynamic Pressure at the Wing. The dynamic pressure over the immersed panel at zero forward speed uses a part-developed slipstream of $1.5 v_i$ that the article assumes at the wing.

\[q_{\text{slip}} = \tfrac{1}{2} \rho (1.5 v_i)^{2} = \tfrac{1}{2} \times 1.225 \times 60.07^{2} = 2{,}210\ \text{Pa} \tag{12}\]

Equation 13, Bespoke Equivalent Airspeed of the Static Slipstream. The slipstream dynamic pressure from the assumed part-developed velocity is expressed as an equivalent airspeed.

\[V_{\text{eq}} = \sqrt{\frac{2 q_{\text{slip}}}{\rho}} = 60.1\ \text{m/s} = 117\ \text{kt} \tag{13}\]

Equation 14, Induced Velocity in Forward Flight. With forward speed the momentum theory induced velocity satisfies an implicit relation that reduces to the static value at zero speed.

\[v_i = \frac{T}{2 \rho A \sqrt{V^{2} + v_i^{2}}} \tag{14}\]

Equation 15, Local Angle of Attack in the Slipstream. Resolving the freestream at the wing tilt angle and the slipstream along the chord gives the local angle of attack of the immersed panel.

\[\alpha_{\text{local}} = \arctan\left(\frac{V \sin i_w}{V \cos i_w + v_s}\right) \tag{15}\]

Equation 16, Force Balance During Conversion. In level flight the vertical thrust component plus lift equals weight and the horizontal thrust component equals drag.

\[T \sin i_w + L = W, \qquad T \cos i_w = D \tag{16}\]

Equation 17, Bespoke Lift Split Between Immersed and Free Panels. The article models wing lift as an immersed panel at slipstream dynamic pressure plus the remainder at freestream dynamic pressure.

\[L = q_{\text{slip}} S_{\text{imm}} C_{L,\text{imm}} + q_\infty (S - S_{\text{imm}}) C_{L,\text{free}} \tag{17}\]

Equation 18, Effective Angle of Attack in Descent. A descent rate adds its inflow angle to the local angle of attack because the freestream arrives from below.

\[\alpha_{\text{eff}} = \alpha_{\text{local}} + \arctan\frac{w}{V} \tag{18}\]

Equation 19, Descent Capability Added by Full-Span Droop. The outboard and inboard leading-edge droops measured in the wind tunnel add 600 and 500 feet per minute of descent capability. Pegg’s VZ-2 flight tests

\[\Delta \dot{h} = 600 + 500 = 1{,}100\ \text{ft/min} \tag{19}\]

Equation 20, Disc Loading per Propeller. The weight in newtons over the total disc area of two propellers gives the disc loading of the configuration.

\[\frac{W}{n A} = \frac{146{,}800}{2 \times 18.68} = 3{,}929\ \text{N/m}^{2} = 82.1\ \text{lb/ft}^{2} \tag{20}\]

Equation 21, Ideal Hover Power. Momentum theory gives the ideal hover power as the number of propellers times the thrust times the induced velocity.

\[P = n\, T \sqrt{\frac{T}{2 \rho A}} \tag{21}\]

Equation 22, Installed Shaft Power. The installed power is twice the 5,850 equivalent horsepower of each T40 engine in the compiled specification. Hiller X-18

\[P_{\text{shaft}} = 2 \times 5{,}850 = 11{,}700\ \text{hp} \tag{22}\]

Equation 23, Hover Figure of Merit. The figure of merit is the ideal hover power over the installed shaft power.

\[\text{FM} = \frac{P_{\text{ideal}}}{P_{\text{shaft}}} = \frac{7{,}883}{11{,}700} = 0.674 \tag{23}\]

Equation 24, Aerodynamic and Jet Pitch Moments. The elevator moment scales with dynamic pressure and so with the square of speed, while the jet moment is thrust times arm and holds at zero speed.

\[M_{\text{aero}} = q S \bar{c}\, C_{m\delta_e} \delta_e \propto V^{2}, \qquad M_{\text{jet}} = T_{\text{jet}}\, l \tag{24}\]

Equation 25, Bespoke Pitch Jet Arm and Moment. The jet moment uses an arm taken as 0.45 of the fuselage length and a deflected thrust of a thousand pounds force, both of which the article assumes. Hiller X-18

\[l = 0.45 \times 63 \times 0.3048 = 8.64\ \text{m}, \qquad M_{\text{jet}} = 4{,}448 \times 8.64 = 38.4\ \text{kN m} \tag{25}\]

Equation 26, Bespoke Crossover Speed From Jet to Elevator. Setting the assumed jet moment equal to the elevator moment, with an assumed effectiveness of 1.2 per radian at 20 degrees of deflection, gives the speed at which the elevator takes over.

\[V_{\text{cross}} = \sqrt{\frac{2 M_{\text{jet}}}{\rho S \bar{c}\, C_{m\delta_e} \delta_e}} = 30.2\ \text{m/s} = 58.6\ \text{kt} \tag{26}\]

Equation 27, Bespoke Rolling Moment After an Engine Failure in Hover. Half the hover lift is lost at a propeller station taken at an assumed quarter span of the wing.

\[M_{\text{roll}} = T y = 73.40 \times 3.658 = 268\ \text{kN m} \tag{27}\]

Equation 28, Aileron Rolling Moment. Aileron rolling moment is dynamic pressure times wing area times span times the control derivative times deflection.

\[L_{\delta_a} = q S b\, C_{l\delta_a} \delta_a \tag{28}\]

Equation 29, Blowing Momentum Coefficient. The momentum coefficient is the jet momentum flux over the freestream dynamic pressure times the wing area.

\[C_\mu = \frac{\dot{m} V_j}{q_\infty S} \tag{29}\]

Equation 30, Propeller Advance Ratio. The advance ratio is the flight speed over the rotational speed times the propeller diameter.

\[J = \frac{V}{n D} \tag{30}\]

Equation 31, Bespoke Helical Tip Mach Number in Conversion. The helical tip Mach number at 60 metres per second rests on a propeller speed of 1,100 revolutions per minute that the article assumes.

\[M_{\text{tip}} = \frac{\sqrt{(\pi n D)^{2} + V^{2}}}{a} = \frac{\sqrt{280.9^{2} + 60^{2}}}{340.3} = 0.844 \tag{31}\]

Equation 32, Rolling Moment From Asymmetric Thrust. A fractional thrust difference $\varepsilon$ produces a rolling moment of $\varepsilon$ times the propeller thrust times its lateral arm.

\[M_{\text{roll}} = \varepsilon\, T y \tag{32}\]

Equation 33, Tolerable Asymmetry Against Altitude. Because aileron authority scales with density at a given true airspeed, the tolerable asymmetry at sea level exceeds that at 10,000 feet by the standard atmosphere density ratio.

\[\frac{\varepsilon_{\text{SL}}}{\varepsilon_{10{,}000}} = \frac{\rho_{\text{SL}}}{\rho_{10{,}000}} = 1.354 \tag{33}\]

Notation

$W$, the aircraft weight
$S$, the wing reference area
$b$, the wing span
$D_p$, the propeller diameter, with $D_{\text{slip}}$ the fully contracted slipstream diameter
$v_i$, the induced velocity at the propeller disc
$v_s$, the slipstream velocity behind the disc
$q_{\text{slip}}$, the dynamic pressure in the slipstream over the immersed panel, with $q_\infty$ the freestream dynamic pressure
$i_w$, the wing tilt angle
$\alpha_{\text{local}}$, the local angle of attack of the immersed panel
$S_{\text{imm}}$, the immersed wing area
$C_{L,\text{imm}}$, the lift coefficient of the immersed panel, with $C_{L,\text{free}}$ that of the free panel
$\text{FM}$, the hover figure of merit
$C_{m\delta_e}$, the elevator pitch control power
$\bar{c}$, the mean aerodynamic chord
$M_{\text{jet}}$, the pitching moment of the pitch control jet, with $M_{\text{aero}}$ the elevator moment
$C_{l\delta_a}$, the aileron roll control derivative
$C_\mu$, the blowing momentum coefficient
$J$, the propeller advance ratio
$M_{\text{tip}}$, the helical tip Mach number
$\varepsilon$, the fractional thrust difference between the two propellers

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Referenced by

X-Planes: Synthesis and What the Designation Became 2025-12-16
X-Planes: Bell Textron X-76 SPRINT 2025-12-15
X-Planes: X-69 through X-75, the Leapfrogged Block 2025-12-14
X-Planes: General Atomics X-68 LongShot 2025-12-13
X-Planes: X-67, the Slot Taken by XQ-67A 2025-12-12
X-Planes: Boeing X-66 2025-12-11
X-Planes: Aurora Flight Sciences X-65 CRANE 2025-12-10
X-Planes: Invocon X-64 2025-12-09
X-Planes: ABL Space Systems X-63 2025-12-08
X-Planes: Lockheed Martin X-62 VISTA 2025-12-07
X-Planes: Dynetics X-61 Gremlins 2025-12-06
X-Planes: Generation Orbit X-60 2025-12-05
X-Planes: Lockheed Martin X-59 Quesst 2025-12-04
X-Planes: X-58, the Slot Taken by XQ-58 2025-12-03
X-Planes: ESAero X-57 Maxwell 2025-12-02
X-Planes: Lockheed Martin X-56 2025-12-01
X-Planes: Lockheed Martin X-55 ACCA 2025-11-30
X-Planes: Gulfstream X-54 2025-11-29
X-Planes: Boeing X-53 Active Aeroelastic Wing 2025-11-28
X-Planes: X-52, the Designation Refused 2025-11-27
X-Planes: Boeing X-51 Waverider 2025-11-26
X-Planes: Boeing X-50 Dragonfly 2025-11-25
X-Planes: Piasecki X-49 SpeedHawk 2025-11-24
X-Planes: Boeing X-48 2025-11-23
X-Planes: Northrop Grumman X-47 2025-11-22
X-Planes: Boeing X-46 2025-11-21
X-Planes: Boeing X-45 2025-11-20
X-Planes: X-44, One Designation and Two Aircraft 2025-11-19
X-Planes: Micro-Craft X-43 Hyper-X 2025-11-18
X-Planes: Orbital Sciences X-42 2025-11-17
X-Planes: X-41 Common Aero Vehicle 2025-11-16
X-Planes: Boeing X-40 2025-11-15
X-Planes: X-39, Reserved but Never Assigned 2025-11-14
X-Planes: Scaled Composites X-38 2025-11-13
X-Planes: Boeing X-37 2025-11-12
X-Planes: McDonnell Douglas X-36 2025-11-11
X-Planes: Lockheed Martin X-35 2025-11-10
X-Planes: Orbital Sciences X-34 2025-11-09
X-Planes: Lockheed Martin X-33 2025-11-08
X-Planes: Boeing X-32 2025-11-07
X-Planes: Rockwell-MBB X-31 2025-11-06
X-Planes: Rockwell X-30 and the National Aero-Space Plane 2025-11-05
X-Planes: Grumman X-29 2025-11-04
X-Planes: Osprey X-28 Sea Skimmer 2025-11-03
X-Planes: Lockheed X-27 2025-11-02
X-Planes: Schweizer X-26 Frigate 2025-11-01
X-Planes: Bensen X-25 2025-10-31
X-Planes: Martin Marietta X-24 2025-10-30
X-Planes: Martin Marietta X-23 PRIME and a Contested Assignment 2025-10-29
X-Planes: Bell X-22 2025-10-28
X-Planes: Northrop X-21 2025-10-27
X-Planes: Boeing X-20 Dyna-Soar 2025-10-26
X-Planes: Curtiss-Wright X-19 2025-10-25

The Research Question

The Keystone Is Slipstream Immersion

Why This Was the Binding Unknown in 1957

Programme Origin

The Vehicle

Sizing From First Principles

How Much of the Wing Is Immersed

Is the Un-Immersed Wing Actually Stalled

What the Slipstream Buys

The Relation That Makes the Configuration Work

Where the Immersed Panel Finally Does Stall

What the Immersed Wing Can Carry

The Conversion Corridor Exists

Descent Closes the Corridor

Disc Loading as the Cost of the Configuration

Dependent Systems

The Pitch Jet Repeats the X-13 and X-14 Answer

The Engines and the Missing Cross-Shaft

The Wing and Its Devices

The Propellers

The Downwash

The Flight Test Record

How Much Asymmetry That Took

Comparison With Ground Prediction

What the Data Changed

The Contemporary Literature

Propeller and Wing Interaction Became Computable

Distributed Electric Propulsion Changes the Immersed Fraction

The Keystone Was Dissolved Rather Than Solved

Interaction Is Computed Rather Than Measured

The Corridor Is an Optimisation Problem

Descent Is Still the Hard Part

Redundancy Replaced Cross-Shafting

Handling Qualities Became Criteria

The Constraint Moved to Certification

The Noise the X-18 Never Had to Face

Energy and Sizing, the Modern Disc Loading

Ground Effect and the Vertiport

Methods and Autonomy

The Configuration Returned Because the Constraint Changed

Flight control, handling qualities and hover control power

Wing stall, maximum lift and high-lift devices

Tilt-rotor and other V/STOL configurations

Propeller aerodynamics, static thrust and contra-rotation

Momentum theory, rotor aerodynamics and hover performance

Noise of propellers and lifting rotors

Propeller slipstream and wing interaction

Ground effect, downwash and the vertiport

Transition, the conversion corridor and its optimisation

Electric vertical take-off and urban air mobility design

Energy, batteries and sizing

The tilt-wing configuration

Distributed electric propulsion

Certification, airspace and operations

Engine failure, cross-shafting and redundancy

Wind tunnel testing and the correlation with flight

Descent and the vortex ring state

The atmosphere and the flight condition

Computational methods, surrogates and autonomy

Rotor and airframe structures, dynamics and reliability

Powerplants, turboprops and jet-lift propulsion

Other rotorcraft and powered-lift literature

Where the Framing Breaks Down

The Source Base

The Shape of the Reference Base

The Definition of Primary

Thin Subjects

What the Survey Admits

Epistemic State

Out of Scope

Conclusion

Equations

Notation

References

Primary Sources, Peer-Reviewed

Primary Sources, Non-Peer-Reviewed

Secondary Sources

Commercial Sources

Tertiary Sources

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