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The X-1E was designed to test an ultra-thin 4% thickness to cord wing for supersonic flight.
NACA flight 1. Glide flight for pilot check-out and low speed evaluation.
NACA flight 2. First powered flight. Engine ran at excessive pressure, 4 overspeeds of turbopump and 2 automatic shutdowns. Power terminated by pilot.
NACA flight 3. Mach 0.85 at 9150 m. Damping characteristics good; number 1 cylinder failed to fire.
NACA flight 4. Turbopump did not start; no engine operation.
NACA flight 5. Wind-up turns to Clmas from mach 0.69 to 0.84; also control pulses.
NACA flight 6. Mach 1.55 at 13725 m. Longitudinal and lateral trim changes in transonic region found annoying to pilot.
NACA flight 7. Mach 1.74 at 18300 m. Damaged on landing.
NACA flight 8. Subsonic because cylinders 3 and 4 world not fire.
NACA flight 9. Mach 2.0 at 18300 m. Sideslips, pulses, rolls.
NACA flight 10. Mach 2.1 at 18910 m. Stabilizer, rudder, and aileron pulses.
NACA flight 11. Brief engine power only; flight aborted, unspecified engine malfunction.
NACA flight 12. Only 60-sec rocket operation; intermittent pump operation. Flight aborted, turbopump and engine replaced.
NACA flight 13. No engine operation, ignition failure due to lack of manifold pressure.
NACA flight 14. Mach 1.71 at 20435 m. Aileron and rudder pulses.
NACA flight 15. Mach 2.0 at 22,265 m. Aileron pulses and rolls, sideslips, and wind-up turns. Plane severely damaged upon landing.
NACA flight 16. Planned mach number not attained, loss of power during pushover from climb.
NACA flight 17. Mach 2.24.
NACA flight 18. First flight with ventral fins; longitudinal and lateral stability and control maneuvers. Engine airstart made at 21,350 m.
NACA flight 19. Flight aborted after only 1 cylinder of engine fired. Plane damaged on landing.
NACA flight 20. Stability and control investigation with ventral fins.
NACA flight 21. Stability and control with ventral fins and a new stabilizer bell crank permitting greater stabilizer travel.
NACA flight 22. Checkout flight for John McKay.
NACA flight 23. Check of low-speed stability and control.
NACA flight 24. First flight with elevated chamber pressure; cut short because overcast obscured pilot's view of lakebed.
NACA flight 25. Elevated chamber pressure; good stability and control data gathered.
NACA flight 26. Elevated chamber pressure; low-altitude and low-mach investigation of U-Deta fuel. Last NASA flight.