List of X-planes
List

List of X-planes

Section Title: List
Table Section Text: None

Type	Manufacturer	Agency	Image	Date	Role	Notes

X-1	Bell	USAF, NACA	-	1946	High-speed and high-altitude flight	First aircraft to break the sound barrier in level flight. Proved aerodynamic viability of thin wing sections.

X-1A X-1B X-1C X-1D	Bell	USAF, NACA	-	1951	High-speed and high-altitude flight

X-1E	Bell	USAF, NACA	-	1955	High-speed and high-altitude flight

X-2	Bell	USAF	-	1952	High-speed and high-altitude flight	First aircraft to exceed Mach 3.

X-3 Stiletto	Douglas	USAF, NACA	-	1952	Highly loaded trapezoidal wing	Titanium alloy construction; Underpowered, but provided insights into inertia coupling.

X-4 Bantam	Northrop	USAF, NACA	-	1948	Transonic tailless aircraft

X-5	Bell	USAF, NACA	-	1951	variable geometry	First aircraft to fly with variable wing sweep.

X-6	Convair	USAF, AEC	-	1957	Nuclear Propulsion	Not built. The Convair NB-36H was a B-36 modified to carry a nuclear reactor and flew from 1955 to 1957.

X-7	Lockheed	USAF, USA, USN	-	1951	Ramjet engines.

X-8 Aerobee	Aerojet	NACA, USAF, USN	-	1949	Upper air research	Later models used as sounding rockets.

X-9 Shrike	Bell	USAF	-	1949	Guidance and propulsion technology	Assisted development of GAM-63 Rascal missile.

X-10	North American	USAF	-	1953	SM-64 Navajo missile testbed.

X-11	Convair	USAF	-	1957	SM-65 Atlas missile testbed.

X-12	Convair	USAF	-	1957	SM-65 Atlas missile testbed.

X-13 Vertijet	Ryan	USAF, USN	-	1955	Vertical takeoff and landing (VTOL)	tailsitting VTOL flight.

X-14	Bell	USAF, NASA	-	1957	VTOL	Vectored thrust configuration for VTOL flight.

X-15	North American	USAF, NASA	-	1959	Hypersonic, high-altitude flight	First manned hypersonic aircraft; capable of suborbital spaceflight.

X-15 A-2	North American	USAF, NASA	-	1964	Hypersonic, high-altitude flight	Major Pete Knight flew the X-15 A-2 to a Mach 6.70, making it the fastest piloted flight of the X-plane program.

X-16	Bell	USAF	1954	High-altitude reconnaissance	"X-16" designation used to hide true purpose. Cancelled and never flew.

X-17	Lockheed	USAF, USN	-	1956	High Mach number reentry.

X-18	Hiller	USAF, USN	-	1959	Vertical and/or short take-off and landing (V/STOL)	Evaluated the tiltwing concept for VTOL flight.

X-19	Curtiss-Wright	Tri-service	-	1963	Tandem tiltrotor VTOL	XC-143 designation proposed.

X-20 Dyna-Soar	Boeing	USAF	-	1963	Reusable spaceplane	Military missions. Cancelled and never built.

X-21A	Northrop	USAF	-	1963	Boundary layer control

X-22	Bell	Tri-service	-	1966	Quad ducted fan tiltrotor STOVL

X-23 PRIME	Martin Marietta	USAF	X23 PRIME.JPG	1966	Maneuvering atmospheric reentry	Designation never officially assigned.

X-24A	Martin Marietta	USAF, NASA	-	1969	Low-speed lifting body

X-24B	Martin Marietta	USAF, NASA	-	1973	Low-speed lifting body

X-25	Bensen	USAF	-	1955	Commercial light autogyro for downed pilots.

X-26 Frigate	Schweizer	DARPA, US Army, USN	-	1967	Training glider for yaw-roll coupling Quiet observation aircraft

X-27	Lockheed	None	-	1971	High-performance fighter	Cancelled and never flew.

X-28 Sea Skimmer	Osprey	USN	-	1970	Low-cost aerial policing seaplane

X-29	Grumman	DARPA, USAF, NASA	-	1984	Forward-swept wing

X-30 NASP	Rockwell	NASA, DARPA, USAF	-	1993	Single stage to orbit spaceplane	Cancelled and never built.

X-31	Rockwell-MBB	DARPA, USAF, BdV	Rockwell-MBB X-31 landing.JPG	1990	Thrust vectoring supermaneuverability

X-32A	Boeing	USAF, USN, USMC, RAF	2000	Joint Strike Fighter

X-32B	Boeing	USAF, USN, RAF	-	2001	Joint Strike Fighter

X-33 Venture Star	Lockheed Martin	NASA	-	N/A	Half-scale reusable launch vehicle prototype.	Prototype never completed.

X-34	Orbital Sciences	NASA	-	N/A	Reusable unmanned spaceplane.	Never flew.

X-35A	Lockheed Martin	USAF, USN, USMC, RAF	-	2000	Joint Strike Fighter

X-35B	Lockheed Martin	USAF, USN, USMC, RAF	X-35B Steven F. Udvar-Hazy Center.tif	2001	Joint Strike Fighter

X-35C	Lockheed Martin	USAF, USN, USMC, RAF	-	2000	Joint Strike Fighter

X-36	McDonnell Douglas	NASA	-	1997	28% scale tailless fighter

X-37	Boeing	USAF, NASA	-	2010	Reusable orbital spaceplane	Drop test performed in 2006. Five flights since 22 April 2010. (Four launches on Atlas V; one on Falcon 9.)

X-38	Scaled Composites	NASA	-	1998	Lifting body Crew Return Vehicle

X-39	Unknown	USAF	Classified	Future Aircraft Technology Enhancements (FATE) program.	Designation never officially assigned.

X-40A	Boeing	USAF, NASA	-	1998	80% scale Space Maneuver Vehicle X-37 prototype.

X-41	Unknown	USAF	Classified	Maneuvering re-entry vehicle.

X-42	Unknown	USAF	Classified	Expendable liquid propellant upper-stage rocket.

X-43 Hyper-X	Micro Craft	NASA	-	2001	Hypersonic Scramjet

X-44 MANTA	Lockheed Martin	USAF, NASA	X-44 Manta artistic impression.JPG	N/A	F-22-based Multi-Axis No-Tail Aircraft thrust vectoring	Cancelled, never flew.

X-45	Boeing	DARPA, USAF	-	2002	Unmanned combat air vehicle (UCAV)

X-46	Boeing	DARPA, USN	-	N/A	Unmanned combat air vehicle (UCAV).	Naval use. Cancelled, never flew.

X-47A Pegasus X-47B	Northrop Grumman	DARPA, USN	-	2003	Unmanned combat air vehicle (UCAV)	Naval use.

X-48	Boeing	NASA	-	2007	Blended Wing Body (BWB)

X-49 Speedhawk	Piasecki	US Army	-	2007	Compound helicopter Vectored Thrust Ducted Propeller (VTDP) testbed.

X-50 Dragonfly	Boeing	DARPA	-	2003	Canard Rotor/Wing

X-51 Waverider	Boeing	USAF	-	2010	Hypersonic scramjet

X-52	—	—	—	—	—	Number skipped to avoid confusion with Boeing B-52 Stratofortress.

X-53	Boeing	NASA, USAF	-	2002	Active Aeroelastic Wing

X-54	Gulfstream	NASA	N/A	Low-noise supersonic transport in development.

X-55	Lockheed Martin	USAF	-	2009	Advanced Composite Cargo Aircraft (ACCA)

X-56	Lockheed Martin	USAF/NASA	-	2012	Active flutter suppression and gust load alleviation	Part of the high-altitude, long-endurance (HALE) reconnaissance aircraft program.

X-57 Maxwell	ESAero/Tecnam	NASA	-	2016	Low emission plane powered entirely by electric motors	Part of NASA's Scalable Convergent Electric Propulsion Technology Operations Research project (SCEPTOR)

X-59 QueSST	Lockheed Martin	NASA	-	2018	Prototype quiet supersonic transport aircraft

X-60A	Generation Orbit Launch Services	USAF	2018	Air-launched rocket for hypersonic flight research

Sentence(s)

The Bell X-22 was a STOVL X-plane with tiltrotor ducted fans.

final_sentence: The Bell X-22 was a STOVL X-plane with tiltrotor ducted fans.