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The X-1A, B, and D were essentially identical rocketplanes intended to reach speeds above Mach 2. The X-1A and X-1D were destroyed in in-flight explosions; the X-1B survived, training future moon lander Neil Armstrong on its last flights in 1958.
NACA flight 2. Cabin-pressure regulator malfunction causes inner canopy to crack; only low-speed, low-altitude maneuvers made.
AF flight 1. Glide flight, because of turbopump over-speeding.
AF flight 2. Glide flight, aborted power flight because of evidence of high lox-tank pressure.
AF flight 3. First powered flight.
AF flight 4.
AF flight 5.
AF flight 6.
AF flight 7.
AF flight 8.
AF flight 9.
AF flight 10. Mach 2.3 at 19825 m.
NACA flight 1. Pilot check; nose landing gear failed on landing, minor damage.
NACA flight 3. Speed run to 17080 m and mach 1.8. Limited heating data gathered.
NACA flight 4. Glide flight, due to erratic engine start.
NACA flight 5. Three-chamber engine run to 18300 m to obtain heating data.
NACA flight 6. Mach 1.94 aerodynamic heating investigation (end of heating program).
NACA flight 7. Control pulses at mach 1.45 at 18300 m. Flight for instrumentation check.
NACA flight 8. Supersonic maneuvers to mach 1.5 at 18300 m to determine the dynamic and static stability and control characteristics.
NACA flight 9. Supersonic maneuvers to mach 1.5 at 18300 m to determine the dynamic and static stability and control characteristics.
NACA flight 10. Aborted after launch, indication of open landing-gear door. Propellants jettisoned, completed as a glide flight.
NACA flight 11. Mach 1.65 at 18,300 m. Control pulses, sideslips, and 2 g wind-up turn.
NACA flight 12. Enlarged wing tips installed to simulate wing tips to be used with reaction controls. Mach 1.55 at 18,300 m.
NACA flight 13. Stability and control investigation. Mach 1.5 at 18300 m, accelerated maneuvers, control pulses, and pull-ups.
NACA flight 14. Pilot check. Nose landing gear failed on landing, minor damage.
NACA flight 15. First reaction-control flight.
NACA flight 16. Low-altitude, low-mach reaction-control investigation.
NACA flight 17. Reaction-control investigation. Mach 1.5 at 16775 m. Last NACA flight.