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US Aircrafts marked X

Bell X1
1946
High-speed and high-altitude testing.
First aircraft to break the sound barrier in level flight.
Proved aerodynamic viability of thin wing sections.
Bell X2 - Starbuster
1952
High-speed and high-altitude testing.
First aircraft to exceed Mach 3.
Douglas X3 - Stiletto
1952
Titanium alloy construction; low aspect ratio wings.
Planned to test long-duration high-speed flight.
Incapable of reaching design speed, but provided insights into inertia coupling.
Northrop X4 - Bantam
1948
Evaluated handling characteristics of tailless aircraft in the transsonic speed region.
Bell X5
1951
First aircarft to fly with variable geometry wings.
Convair X6
Never flown
Modified Convair B-36 for study of Aircraft Nuclear Propulsion; not built.
NB-36H testbed reactor.
Lockheed X7 - Flying Stove Pipe
1951
High-speed testbed for Ramjet Engines
Aerojet X8 - Aerobee
Year ?
Upper air research vehicle and sounding rocket.
Bell X9 - Shrike
1949
Guidance and propulsion technology testbed.
Assisted development of GAM-53 Rascal missile.
North American X10
1953
Testbed for SM-64 Navajo missile.
Convair X11
1957
Testbed for SM-65 Atlas missile.
Convair X12
1958
Advanced testbed for SM-65 Atlas missile.
Ryan Aeronautical X13 - Vertijet
1955
Vertical Takeoff and landing (VTOL) testbed.
Evaluated tailsitting configuration for VTOL flight.
Bell X14
1957
VTOL testbed.
Examined the vectored thrust configuration for VTOL flight.
North American Aviation X15
1959
Hypersonic (Mach 6.7), high-altitude (350,000 feet (110,000 m)) testing.
First manned hypersonic aircraft; capable of suborbital spaceflight.
Bell X16
Never flown
High-altitude reconnaissance aircraft project.
"X-16" designation used as cover story.
Lockheed X17
1956
Tested the effects of high Mach number reentry.
Hiller Aircraft X18
1959
VTOL/Short take-off and vertical landing (STOVL) testbed.
Evaluated the tiltwing concept for VTOL flight.
Curtiss-Wright X19
1963
Tandem tiltrotor VTOL transport testbed.
XC-143 designation proposed.
Boeing X20 - Dyna-Soar
Never built
Reusable spaceplane for military missions.
Northrop X21
1963
Boundry layer control testbed.
Bell X22
1966
Quad ducted fan tiltrotor STOVL testbed.
Martin Marietta X23 - Prime
1966
Maneuvering atmospheric reentry effects testbed.

Martin Marietta X24A
1973
Low-speed lifting bofy handling testbed.
Lifting body aerodynamic shape trials.
Martin Marietta X24B
1973
Low-speed lifting bofy handling testbed.
Lifting body aerodynamic shape trials.
Benson X25
1955
Light autogyro for emergency use by downed pilots.
Schweizer X26 - Frigate
1967
Training glider for yaw-roll coupling
Quiet observation aircraft testbed.
Lockheed X27
Never flown
High performance fighter prototype.
Osprey Aircraft X28 - Sea Skimmer
1970
Inexpensive aerial policing seaplane testbed.
Grumman X29
1984
Forward-swept wing testbed.
Rockwell X30 - NASP
Never flown
Single stage to orbit spaceplane prototype.
Rockwell X31 - NASP
1990
Thrust vectoring supermaneuverability testbed.
ESTOL testbed.
Boeing X32
2000
Joint Strike Fighter prototype.
Lockheed Martin X33 - Venture Star
Prototype never completed
Half-scale reusable lauch vehicle prototype.
Orbital Sciences X34
Never flown
Reusable unmanned spaceplane testbed.
Lockheed Martin X35
2000
Joint Strike Fighter prototype.
McDonnell Douglas/Boeing X36
1997
28% scale tailless fighter testbed.
Boeing X37
2006 (droptest) & 2010 (Orbital flight)
Reusable orbital spaceplane.
Scaled Composites X38
1999
Lifting body Crew Return Vehicle demonstrator.
Unknown X39
Unknown
Future Aircraft Technology Enhancements (FATE) program.

Boeing X40
1998
80% scale Space Maneuver Vehicle testbed.
X-37 prototype.
Unknown X41
Unknown
Maneuvering re-entry vehicle.
Unknown X42
Unknown
Expendable liquid propellant upper-stage rocket.
Micro Craft X43 - HyperX
2001
Scramjet hypersonic testbed (Mach 9.68) (110,000 ft).
Lockheed Martin X44 - Manta
Cancelled
F-22 based Multi-Axis No-Tail Aircraft thrust vectoring testbed.
Boeing X45A
2002
Unmanned combat air vehicle (UCAV) demonstrator.
Boeing X45C
2002
Unmanned combat air vehicle (UCAV) demonstrator.
Boeing X46
Cancelled
Naval UCAV demonstrator.
Northrop Grumman X47A - Pegasus
2003
Naval UCAV demonstrator.
Northrop Grumman X47B UCAS-D
2011
Naval UCAV demonstrator.
Boeing X48
2007
Blended Wing Body (BWB) testbed.
Piasechi Aircraft X49 - Speedhawk
2007
Compound helicopter
Vectored Thrust Ducted Propeller (VTDP) testbed.
Boeing X50 - Dragonfly
2003
Canard Rotor/Wing testbed.
Boeing X51 - Waverider
2010
Hypersonic scramjet demonstrator.
Designation X52 skipped to avoind confusion with B52

Boeing Phantom Works X53
2002
Active Aerolastic Wing testbed.
Gulfstream Aerospace X54
In development
Supersonic transport testbed.
Lockheed Martin Skunk Works X55
2009
Advanced Composite Cargo Aircraft (ACCA).
Molded composite fuselage and empennage testbed.
Lockheed Martin Skunk Works X56
2012
Active flutter suppression and gust load alleviation technology for potential use in future high-altitude, long-endurance (HALE) reconnaissance aircraft.
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