List of experimental aircraft



As used here, an experimental or research and development aircraft, sometimes also called an X-plane, is one which is designed or substantially adapted to investigate novel flight technologies.

Argentina

 * FMA I.Ae. 37 glider – testbed for production fighter

Australia

 * GAF Pika – manned test craft for drone program

Brazil

 * Baumgartl PB-60 – towed experimental rotor kite

Canada

 * AEA Silver Dart (1909) – First aircraft to fly in Canada
 * Avro Canada Avrocar – Ducted fan VTOL
 * Birdman Project 102 –
 * Canadair CL-52 – jet engine testbed (converted Boeing B-47)
 * Canadair CL-84 Dynavert – tilt-wing VTOL
 * de Havilland Canada C-8A – Quiet Short-Haul Research Aircraft
 * de Havilland Canada C-8A – Air-Cushion Landing System
 * de Havilland Canada C-8A – Augmentor Wing
 * Marsden Gemini – variable-geometry glider
 * NRC tailless glider – tailless flying wing
 * UTIAS Ornithopter No.1

France

 * Aérocentre NC.130 1939 – High-altitude flight
 * Aérospatiale Ludion 1967 – Thrust vectored rocket VTOL
 * Arsenal-Delanne 10 – Tandem wing
 * Arsenal VG 70 – High speed research
 * Arsenal O.101 – Aerodynamic research
 * Arsenal 2301/SFECMAS 2301 and SFECMAS 1301 – Supersonic research glider
 * Breguet-Dorand Gyroplane Laboratoire – Experimental helicopter
 * Breguet-Richet Gyroplane – Experimental helicopter
 * – Monoplane testbed
 * Dassault Balzac V – VTOL testbed
 * Dassault Mirage IIIV – VTOL testbed
 * Dassault Milan – Canard research
 * Dassault Mirage G – Variable geometry
 * Dassault LOGIDUC – Unmanned combat aerial vehicle UCAV development
 * Dassault nEUROn – UCAV technology demonstrator
 * Farman F.1010 – Heavy cannon flight testing
 * Farman F.1020 – Semi-circular wing
 * Fouga Gemeaux – Engine testbed
 * Gastambide-Levavasseur Variable Surface Aircraft – Variable chord wing testbed
 * Gérin Varivol – Variable chord wing testbed
 * Hanriot HD.28 – tested a Vee tail
 * Hurel-Dubois HD.10 – Very high aspect ratio wings
 * Leduc 0.10 – Ramjet
 * Leduc 0.21 – Ramjet
 * Makhonine Mak-10 – Variable span wing
 * Messier Monoplace Laboratorie – Retractable bicycle undercarriage testbed.
 * Nord 500 – VTOL tilt ducted fan research aircraft
 * Nord 1402/1405 Gerfaut – Delta wing research aircraft
 * Nord 1500 Griffon – Ramjet
 * Nord 1601 – Swept wing research aircraft
 * Payen PA-22 – Tandem delta/normal wings
 * Payen Pa 49 – Tandem delta/normal wings
 * Potez-CAMS 160 – 5/13th scale six engine aerodynamic testbed for development of CAMS 161
 * Robin X4 – Materials and configuration testbed
 * SNECMA Atar Volant – Vertical lift jet
 * SNECMA Coléoptère – Vertical lift annular wing
 * Sud Est SE-1210 scale aerodynamic testbed for SE-1200 transatlantic flying boat
 * Sud-Ouest Ariel – Tip-jet rotor helicopter
 * Sud-Ouest Farfadet – Convertiplane
 * Sud-Ouest Triton – First French jet aircraft

Germany

 * Akaflieg Berlin B 9 1943. – Prone pilot
 * Albatros L.81 – Elektron metal structure testbed
 * AVA AF 1 – Augumented lift
 * DFS 194 1940 – Tailless rocket aircraft used in development of Me 163
 * DFS 346 1948 – Supersonic reconnaissance aircraft used for research
 * Dassault/Dornier Alpha Jet TransSonische Tragflügel (TST) – Transonic supercritical wing research
 * Dornier Do 29 – Tilt rotor STOL
 * Dornier Do 31 – Experimental VTOL transport
 * EWR VJ 101 – Experimental tiltjet VTOL fighter
 * Fieseler Fi 158 – Testbed for radio control system
 * Flettner airplane – Magnus effect test vehicle
 * Flettner Fl 185 – Gyrodyne
 * Focke-Wulf F 19 – Multi-engined canard demonstrator
 * Fokker V.1 – Structures and aerodynamics testbed
 * Göppingen Gö 8 – Development aircraft for Do 214
 * Göppingen Gö 9 – Pusher (behind tail) aerodynamic testbed for Dornier Do 335 development
 * Gotha Go 147 – Tailless research aircraft
 * Heinkel He 119 – High-performance research aircraft
 * Heinkel He 176 – Rocket research aircraft
 * Heinkel He 178 – Jet engine research aircraft
 * Horten H.III – Flying wing
 * Horten H.IV – Flying wing
 * Horten Ho VI – Flying wing
 * Junkers J 1 – Pioneering all-metal cantilever monoplane (1915)
 * Junkers EF 61 – Pressurization
 * Junkers Ju 49 – High-altitude test aircraft
 * Lippisch Delta IV – Delta wing
 * Lippisch DM-1 1944 – Delta wing glider
 * Lippisch Ente – Rocket-powered canard technology demonstrator
 * Lippisch P.13a – Coal-powered delta wing
 * Messerschmitt Me P.1101 – Variable geometry (swing-wing) jet
 * Opel RAK.1 – Rocket propulsion technology demonstrator
 * RFB X-113 – Wing in ground effect vehicle
 * RFB X-114 – Wing in ground effect vehicle
 * Sack AS-6 – Disk wing technology demonstrator
 * Schmeidler SN.2 – Wing flaps
 * VFW VAK 191B – VTOL fighter
 * Zeppelin-Lindau V I – All-metal stressed skin construction

Italy

 * Ambrosini Sagittario 1953 – Swept wing research aircraft
 * Bossi-Bonomi Pedaliante 1936 – Human-powered aircraft
 * Caproni Campini N.1 1940 – Jet engine research
 * Jona J-6 – Tilting wing stabilisation system
 * Lualdi-Tassotti ES 53 – Gyro stabilized helicopter
 * Piaggio P.111 – High-altitude research
 * S.C.A. SS.2 – Experimental canard
 * S.C.A. SS.3 Anitra – Experimental canard
 * Stipa-Caproni – Ducted prop research

Poland

 * Flugtechnische Fertigungsgemeinschaft Prag FGP 227 – Scale proof of concept for German BV 238
 * Lala-1 – Jet biplane testbed for PZL M-15 Belphegor

Japan

 * NAL Aska STOL Research Aircraft 02.jpgen Koken 1937 – Long range experimental aircraft
 * Honda MH02 1993 – Over wing engines, forward swept wing
 * Kawasaki Ki-78 1942 – High speed research aircraft
 * Kayaba Ku-2 1940 – Tailless glider
 * Kayaba Ku-3 – Tailless glider
 * Kayaba Ku-4 – Tailless research aircraft
 * Kimura HK-1 – Tailless glider
 * Mitsubishi RP-1 – Experimental helicopter
 * MXY-6 – Canard scale testbed for Kyushu J7W
 * X1G – High-lift device based on Saab 91 Safir
 * National Aerospace Laboratory (NAL) Asuka – STOL
 * Shin Meiwa UF-XS – Proof of concept demonstrator for Shin Meiwa US-1A
 * Mitsubishi T-2CCV - Experimental aircraft for CCV technology
 * Mitsubishi X-2 Shinshin – Advanced stealth technology demonstrator

Russia/Soviet Union

 * Alexeyev – Ekranoplans
 * Antonov A-40 1942 – Tank glider
 * Antonov 181 – Blown channel wing demonstrator
 * Bartini Beriev VVA-14 1972 – Ekranoplan ground effect vehicle
 * Bartini Stal-6 – High speed aircraft
 * Chyeranovskii BICh-3 – Tailless delta research aircraft
 * Chyeranovskii BICh-11 – Flying wing to test wingtip rudders
 * Chyeranovskii BICh-16 – Human-powered ornithopter
 * Chyeranovskii BICh-18 – Human-powered ornithopter
 * Chizhevski BOK-1 – High-altitude research aircraft
 * Chizhevski BOK-5 – Tailless research aircraft
 * Grigorovich I-Z – Recoilless cannon evaluation
 * Grushin Octyabrenok – Tandem wing
 * Ilyushin Il-76LL – Engine testbeds (5)
 * Kozlov PS – Visiblity (covered in transparent material)
 * MAI EMAI – Magnesium construction
 * Mikoyan-Gurevich MiG-8 Utka – Pusher canard proof of concept (1945)
 * Mikoyan-Gurevich MiG-105 – Lifting body
 * Mikoyan Project 1.44 – Technology demonstrator
 * Mikoyan-Gurevich N – Mixed propulsion system
 * Moskalyev SAM-9 Strela – Delta wing
 * NIAI RK – Telescopic wings
 * NIAI RK-I – Telescopic wings
 * Nikitin PSN-2 – Glider bombers
 * Sukhanov Diskoplan – Disk wings
 * Sukhoi T-10 – Technology demonstrator
 * Sukhoi T-58VD – VTOL research aircraft
 * Sukhoi Su-47 – Technology demonstrator
 * Thermoplan – Heavy lift lenticular-shaped hybrid airship technology demonstrator
 * Tsybin LL – Forward swept wing
 * Tsybin NM-1 – Proof of concept
 * Tupolev Tu-95LAL – Nuclear-powered aircraft
 * Ushakov – Flying submarines
 * Yakovlev Yak-36 – VTOL technology demonstrator
 * Yakovlev Yak-42LL – Progress D-236 propfan engine testbed
 * Yakovlev Yak-1000 – Supersonic technology demonstrator
 * Zveno project – Parasite fighters

Spain

 * Cierva C.4 1923 – Experimental autogyro, first to fly
 * Cierva C.6 1924 – Experimental autogyro

Sweden

 * Saab 201 - Aerodynamic testbed for Saab 29 Tunnan
 * Saab 202 – Aerodynamic testbed for Saab 32 Lansen
 * Saab 210 1952 – Aerodynamic testbed for double delta concept for Saab 35 Draken

Switzerland

 * Solar Impulse Project – Solar power technology demonstrator

United Kingdom

 * Armstrong Whitworth Ape 1926 – Variable configuration aerodynamic test vehicle
 * Armstrong Whitworth A.W.52 1947 – Jet powered flying wing
 * Avro 707 1949 – Aerodynamic proof of concept for Avro Vulcan delta wing bomber
 * Avro Ashton – Jet engine research vehicle based on Avro Tudor
 * BAC 221 – High speed delta wing research
 * Baynes Bat – Experimental tailless glider
 * Blackburn B-20 – Retractable hull seaplane
 * Boulton Paul P.6 – Wing research
 * Boulton Paul P.92 – Half-scale proof of concept for turret fighter
 * Boulton Paul P.111 – Delta-wing research aircraft
 * Boulton Paul P.120 – Delta-wing research aircraft
 * Bristol 138 – High-altitude research aircraft
 * Bristol 188 – High speed flight research
 * British Aerospace EAP – Technology demonstrator
 * Cierva W.9 – Experimental helicopter with anti-torque jet efflux
 * de Havilland DH 108 Swallow – Swept wing tailless transsonic research aircraft
 * English Electric P.1A – Supersonic research aircraft
 * modified Fairey Battle – Engine testbed for Rolls-Royce Exe, Fairey Prince (H-16) and Napier Dagger.
 * Fairey Delta 1 – Delta-wing research aircraft
 * Fairey Delta 2 – Delta-wing research aircraft
 * Fairey Jet Gyrodyne – Jet-powered rotor technology demonstrator
 * Folland Fo.108 – Engine test bed
 * General Aircraft GAL.56 – Tailless swept wing glider
 * Gloster E.28/39 – Jet engine research
 * Gloster Meteor F8 "Prone Pilot" – Prone position flight control research
 * Gloster Trent Meteor – Turboprop propulsion
 * Hafner A.R.III Gyroplane – Experimental autogyro
 * Handley Page H.P.17 – Aerodynamic slot research
 * Handley Page H.P.20 – Aerodynamic slot research
 * Handley Page H.P.75 Manx – Tailless flight research
 * Handley Page HP.88 – Handley Page Victor aerodynamic testbed
 * Handley Page HP.115 – Low speed delta-wing research
 * Hawker P.1052 – Swept wing testbed
 * Hawker P.1072 – Armstrong Siddeley Snarler rocket booster testbed
 * Hawker P.1127 – V/STOL technology demonstrator, led to Hawker Harrier
 * Hillson Bi-mono – Slip-wing research
 * Hunting H.126 – Blown flap research
 * Miles M.3E Gillette Falcon – High speed flight research
 * Miles M.30 – Blended wing body design
 * Miles M.35 Libellula – Tandem-wing fighter testbed
 * Miles M.39B Libellula – Tandem-wing research
 * Miles M.52 – Supersonic flight research
 * Parnall Parasol – Wing pressure and aileron testing
 * Parnall Peto – Experimental submarine-launched aircraft
 * Parnall Prawn – Flying boat testing buried engine with variable-angle thrust line
 * Reid and Sigrist R.S.4 Bobsleigh – Prone-pilot research
 * Rolls-Royce Thrust Measuring Rig – Low speed VTOL control test rig
 * Saro Shrimp – Experimental half-scale flying boat for development of cancelled Saunders-Roe S.38
 * Saunders-Roe SR.53 – Mixed rocket/jet propulsion development aircraft for cancelled Saunders-Roe SR.177
 * Short Cockle – Metal construction technology demonstrator for flying boats
 * Short Mussel – Testing metal construction techniques for aircraft floats
 * Short S.6 Sturgeon – Tested aluminium construction techniques for aircraft
 * Short S.31 – Half-scale model for Short Stirling development
 * Short SB.1 – Tailless glider for isoclinic wing research
 * Short SB.4 Sherpa – Powered isoclinic wing research
 * Short SB.5 – English Electric Lightning wing research
 * Short SC.1 – VTOL research
 * Short Silver Streak – Stressed skin construction, developed into Short Springbok
 * Supermarine 508 – Development aircraft with vee tail
 * Supermarine 525 – Swept wing development aircraft for Supermarine Scimitar program
 * Vickers Type 618 Nene-Viking – Jet engine testbed
 * Vickers Type 470 and Type 486 Wellington – Whittle jet engine testbeds
 * Vickers Type 602 Wellington Mark X – Rolls-Royce Dart turboprop testbed
 * Westland-Hill Pterodactyl – Tailless monoplane testbeds
 * Youngman-Baynes High Lift – Youngman flap testbed

X-planes

 * Bell X-1 – Supersonic flight and sound barrier
 * Bell X-2 – Mach 2–3 supersonic flight
 * Douglas X-3 Stiletto – Sustained supersonic flight
 * Northrop X-4 Bantam – Tailless aircraft
 * Bell X-5 – Variable-sweep wing
 * Convair X-6 – Nuclear reactor test aircraft (for nuclear-powered aircraft)
 * Lockheed X-7 – Unmanned ramjet and guidance test missile
 * Aerojet General X-8 – Sounding rocket (became Aerobee)
 * Bell X-9 Shrike – Guided missile
 * North American X-10 – Unmanned missile technology demonstrator
 * Convair X-11 – Single engine missile testbed for Atlas
 * Convair X-12 – Three engine missile testbed for Atlas
 * Ryan X-13 Vertijet – Tail sitter VTOL jet
 * Bell X-14 – Thrust vectoring VTOL jet
 * North American X-15 – Hypersonic rocket-powered research aircraft (Mach 6)
 * Bell X-16 - High-altitude reconnaissance jet
 * Lockheed X-17 – Research rocket testing high mach re-entry
 * Hiller X-18 – Tiltwing STOVL cargo aircraft
 * Curtiss-Wright X-19 – VTOL tiltrotor
 * X-20 Dyna-Soar – Spaceplane program
 * Northrop X-21 – Laminar flow wing
 * Bell X-22 – Ducted fan V/STOL
 * Martin X-23 PRIME – Lifting body reentry vehicle testbed
 * Martin Marietta X-24 – Lifting body test aircraft
 * Bensen X-25 – Single-seat autogyro
 * Schweizer X-26 Frigate – Sailplane
 * Lockheed X-27 Lancer – high-performance technology demonstrator based on Lockheed CL-1200
 * Pereira X-28A Sea Skimmer – Single-seat flying boat for US Navy
 * Grumman X-29 – Forward-swept wing test aircraft
 * Rockwell X-30 – Single-stage-to-orbit spacecraft
 * Rockwell-MBB X-31 – Extreme angle of attack test aircraft
 * Boeing X-32 – Joint Strike Fighter Program technology demonstrator
 * Lockheed Martin X-33 – Unmanned scale demonstrator for VentureStar single stage to orbit spacecraft
 * Orbital Sciences X-34 – Reusable launch vehicle testbed
 * Lockheed Martin X-35 – Joint Strike Fighter Program technology demonstrator, developed into F-35 Lightning II
 * McDonnell Douglas X-36 – Tailless fighter research agility aircraft
 * Boeing X-37 – Reusable unmanned spacecraft
 * NASA X-38 – Crew return vehicle for International Space Station (cancelled after tests)
 * X-39 – Reserved for USAF/DARPA program use
 * Boeing X-40 Space Maneuver Vehicle – Testbed for X-37 guidance and flight characteristics
 * X-41 Common Aero Vehicle – Classified DARPA/NASA maneuvering re-entry vehicle
 * X-42 Pop-Up Upper Stage – Classified rocket upper stage
 * NASA X-43 Hyper-X – Hypersonic scramjet
 * Lockheed Martin X-44 MANTA – Multi-axis tailless aircraft concept
 * Boeing X-45 – Unmanned combat air vehicle
 * Boeing X-46 – Unmanned combat air vehicle (proposal only)
 * Northrop Grumman X-47A Pegasus – Unmanned combat air vehicle
 * Northrop Grumman X-47B Iron Raven – Aircraft carrier capable unmanned combat air vehicle technology demonstrator
 * Boeing X-48 – Blended wing aircraft
 * Piasecki X-49 – Compound helicopter technology demonstrator
 * Boeing X-50 Dragonfly – Gyrodyne unmanned aerial vehicle
 * Boeing X-51 Waverider – Mach 5+ scramjet missile demonstrator
 * Boeing X-53 Active Aeroelastic Wing – Wing warping flight demonstrator
 * Gulfstream X-54 – Supersonic boom intensity research and demonstration aircraft
 * Lockheed Martin X-55 – Advanced composites technology demonstrator
 * Lockheed Martin X-56 – Flutter suppression and gust load testing unmanned testbed
 * NASA X-57 Maxwell - Electric-powered light aircraft
 * Lockheed Martin X-59 QueSST - Low-boom supersonic aircraft
 * Generation Orbit X-60 - Air-launched single stage suborbital rocket vehicle
 * Dynetics X-61 Gremlins - Unmanned aerial vehicle
 * General Dynamics X-62 VISTA - Variable stability, thrust vectoring (formerly known as NF-16D VISTA)

Other experimental types

 * Acme Sierra 1959 – Technology demonstrator
 * AstroFlight Sunrise 1974 – Solar powered drone
 * Ball-Bartoe Jetwing 1977 – Blown wing research
 * Bell D-292 1985 – Advanced Composite Airframe Program
 * Bell L-39 1946 – Swept wing research
 * Bell Model 65 1954 – Tiltjet VTOL
 * Bell XV-15 1977 – Tiltrotor VTOL, precursor to V-22 Osprey
 * Bell 533 1962 – US Army high speed helicopter experiments
 * Boeing ecoDemonstrator 2012 – Airliner fuel efficiency and noise reduction technologies
 * Budd BB-1 Pioneer 1931 – Stainless steel construction
 * Burnelli RB-1 1921 – Lifting body proof of concept vehicle
 * Chrysler VZ-6 1959 – Ducted fan
 * Convair NB-36 1955 – Nuclear propelled aircraft testbed
 * Convair XFY Pogo 1954 – Fixed propeller VTOL
 * Curtiss-Wright VZ-7 1958 – Quadcopter
 * Curtiss-Wright X-100 1963 – Tilt rotor VTOL (developed into X-200 and X-19)
 * Custer Channel Wings 1953 – Blown half-barrel wings
 * Doak VZ-4 1958 – Tilt-fan VTOL
 * Douglas D-558-I Skystreak 1947 – Supersonic research
 * Douglas D-558-II Skyrocket 1948 – Supersonic research
 * Fairchild VZ-5 1959 – Deflected air VTOL
 * Farrar LSG-1 Bird Flight Machine 1969 – Glider to research bird flight
 * General Dynamics F-16XL 1982 – Relaxed stability delta wing, boundary layer suction laminar flow
 * General Dynamics F-16 VISTA 1992 – Variable stability, thrust vectoring (Redesignated X-62 Vista in 2021)
 * General Electric GE36 testbed 1986 – Propfan engine testbed on a modified Boeing 727
 * Goodyear Inflatoplane 1956 – Inflatable rescue aircraft technology demonstrator
 * Gossamer Albatross 1979 – Human-powered flight
 * Gossamer Condor 1977 – Human-powered flight
 * modified Grumman Gulfstream II – Engine testbed for the NASA Propfan Test Assessment (PTA)
 * Hiller VZ-1 Pawnee 1955 – Direct lift rotor platform
 * Hypersonic Technology Vehicle 2 2010 – Hypersonic glider
 * Kaman K-125 1947 – Intermesh twin rotor helicopter, servo-flap control
 * Kaman K-16 – Modified Grumman Goose for tiltwing V/STOL research
 * Lockheed Altair 1938 – Twinned engine testbed (both engines were in a single cowl)
 * NASA Dryden Lockheed C-140 Jetstar 1964 – Electronic variable stability, propfan engine (1981) and laminar flow wing testbed (1985)
 * Lockheed Have Blue – Stealth technology demonstrator
 * Lockheed Vega Winnie Mae – high-altitude research – confirmed existence of jet stream
 * Lockheed QT-2 – Quiet Thruster noise suppression experiments
 * Lockheed XC-35 – Pressurized cabin development
 * Lockheed XV-4 Hummingbird – Jetlift VTOL
 * LTV XC-142 – VTOL transport technology demonstrator
 * Martin 162A Tadpole Clipper – Proof of concept aircraft
 * Martin XB-26H Marauder – Tandem undercarriage
 * McDonnell Douglas MD-81 UHB – General Electric GE36 and PW-Allison 578-DX propfan engine testbed
 * NASA AD-1 – Oblique Wing
 * NASA Environmental Research Aircraft and Sensor Technology experimental aircraft – ALTUS, Pathfinder and Helios
 * NASA Hyper III – Lifting body remotely piloted vehicle
 * NASA M2-F1 – Lifting body/re-entry vehicle
 * NASA Pathfinder – Solar-powered aircraft
 * Northrop F-5 Shaped Sonic Boom Demonstrator – Shockwave reduction
 * Northrop HL-10 – Lifting body/re-entry vehicle research
 * Northrop M2-F2 – Lifting body/re-entry vehicle research
 * Northrop M2-F3 – Lifting body/re-entry vehicle research
 * Northrop N-1M – Flying wing research
 * Northrop N-9M – Flying wing proof of concept aircraft for Northrop YB-35
 * Northrop Tacit Blue – Stealth technology demonstrator
 * Piasecki PV-2 – Helicopter technology demonstrator
 * Piasecki VZ-8 Airgeep – Liftfan VTOL research
 * Piasecki PA-97 1980 – Heavy lifter
 * Republic XF-84H "Thunderscreech" – Supersonic propeller testbed
 * Republic XF-91 Thunderceptor – Inversely tapered swept wing
 * Rockwell HiMAT – Maneuverability and control research
 * Rockwell XFV-12 – Augmented wing vectored thrust VTOL
 * Rotary Rocket Roton 1999 – Single stage to orbit helicopter rocket
 * Ryan VZ-3 Vertiplane 1958 – Blown flap VTOL research
 * Ryan XV-5 Vertifan 1964 – Fan lift VTOL research
 * Sawyer Skyjacker II – Low aspect ratio research aircraft
 * Scaled Composites Proteus 1998 – Telecommunication relay testbed
 * Schweizer SGS 1-29 1958 – Laminar flow research on wings made of metal
 * Sikorsky S-69 1981 – Compound co-axial research
 * Sikorsky S-72 1976 – Helicopter/aircraft hybrid research
 * Sikorsky S-75 1984 – Advanced Composite Aircraft Program
 * Sikorsky S-76 SHADOW 1985 – Sikorsky Helicopter Advanced Demonstrator and Operator Workload
 * Stinson L-1 Vigilant – One example modified for boundary layer experiments
 * Travel Air 2000 – One modified for Besler steam powered aircraft
 * Vertol VZ-2 – tilt wing VTOL research
 * Vought V-173 – Disk wing research for Vought XF5U
 * Vought V-326 – High-altitude test aircraft
 * Vought-Sikorsky VS-300 – Helicopter