List of X-4 flights

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X-4 pilots

PilotAgencyFlightsAircraft
A.BoydUSAF146-677
Frank Everest USAF446-677
R.L. JohnsonUSAF146-677
J.S. NashUSAF146-677
Chuck Yeager USAF746-677
S.P. ButchartNACA446-677
George CooperNACA146-677
Scott CrossfieldNACA2946-677
John GriffithNACA746-677
W.P. JonesNACA1446-677
John McKayNACA146-677
Joseph WalkerNACA146-677
Charles Tucker Northrop3146-676/46-677

X-4 flights

Vehicle
Flight #		DatePilotAircraftAgencyVelocity
-Mach-		Altitude
- m -		Comments
X-4 #1August 18, 1950Chuck Yeager46-677USAF 1 ? ?Air Force flight. Pilot familiarization.
X-4 #2August 22, 1950Frank Everest46-677USAF 2 ? ?Air Force flight. Pilot familiarization.
X-4 #3August 22, 1950Frank Everest46-677USAF 3 ? ?Aborted, landing gear malfunction.
X-4 #4August 30, 1950Frank Everest46-677USAF 4 ? ?Handling qualities.
X-4 #5August 31, 1950Frank Everest46-677USAF 5 ? ?Same as flight 4.
X-4 #6September 8, 1950Chuck Yeager46-677USAF 6 ? ?Longitudinal and latitudinal stability and control.
X-4 #7September, 1950Chuck Yeager46-677USAF 7 ? ?Aborted, faulty canopy lock.
X-4 #8September, 1950Chuck Yeager46-677USAF 8 ? ?Longitudinal and latitudinal dynamic stability and control.
X-4 #9September, 1950Chuck Yeager46-677USAF 9 ? ?Same as flight 8.
X-4 #10September, 1950Chuck Yeager46-677USAF 10 ? ?Same as flight 8.
X-4 #11September, 1950Chuck Yeager46-677USAF 11 ? ?Same as flight 8.
X-4 #12September 22, 1950-46-677USAF 12 ? ?Air Force flight. Pilot familiarization.
X-4 #13September-November, 1950A. Boyd46-677USAF 13 ? ?Air Force flight. Pilot famiiliarization.
X-4 #14September-November, 1950J.S. Nash46-677USAF 14 ? ?Air Force flight. Pilot famiiliarization. Airspeed calibration.
X-4 #15September-November, 1950John Griffith46-677NACA 1 ? ?First NACA pilot checkflight.
X-4 #16September-November, 1950John Griffith46-677NACA 2 ? ?Longitudinal, latitudinal, directional stability, and control.
X-4 #17September-November, 1950John Griffith46-677NACA 3 ? ?Same as flight 16.
X-4 #18September-November, 1950John Griffith46-677NACA 4 ? ?Same as flight 16.
X-4 #19September-November, 1950John Griffith46-677NACA 5 ? ?Same as flight 16.
X-4 #20November 7, 1950John Griffith46-677NACA 6 ? ?Same as flight 16.
X-4 #21November 17, 1950John Griffith46-677NACA 7 ? ?Same as flight 16.
X-4 #22December 6, 1950R.L. Johnson46-677USAF 15 ? ?Air Force flight. Pilot famiiliarization.
X-4 #23December 6, 1950Scott Crossfield46-677NACA 8 ? ?NACA pilot checkflight. Aborted.
X-4 #24December 15, 1950Scott Crossfield46-677NACA 9 ? ?Aborted; instrument malfunction.
X-4 #25December 28, 1950Scott Crossfield46-677NACA 10 ? ?Longitudinal, latitudinal, directional stability and control.
X-4 #26January 4, 1951Scott Crossfield46-677NACA 11 ? ?Same as flight 25.
X-4 #27January 17, 1951Scott Crossfield46-677NACA 12 ? ?Same as flight 25.
X-4 #28January 19, 1951Scott Crossfield46-677NACA 13 ? ?Aborted, landing gear malfunction.
X-4 #29January 24, 1951Scott Crossfield46-677NACA 14 ? ?Aborted, instrument malfunction.
X-4 #30January 26, 1951Scott Crossfield46-677NACA 15 ? ?Longitudinal, latitudinal, directional stability and control.
X-4 #31February 19, 1951Scott Crossfield46-677NACA 16 ? ?Same as flight 30.
X-4 #32March 19, 1951Scott Crossfield46-677NACA 17 ? ?Same as flight 30.
X-4 #33March 26, 1951Scott Crossfield46-677NACA 18 ? ?Same as flight 30.
X-4 #34March 28, 1951Scott Crossfield46-677NACA 19 ? ?Same as flight 30.
X-4 #35April 12, 1951Scott Crossfield46-677NACA 20 ? ?Same as flight 30.
X-4 #36April 13, 1951Scott Crossfield46-677NACA 21 ? ?Same as flight 30.
X-4 #37April 17, 1951Scott Crossfield46-677NACA 22 ? ?Same as flight 30.
X-4 #38April 20, 1951W.P. Jones46-677NACA 23 ? ?NACA pilot check.
X-4 #39April 26, 1951Scott Crossfield46-677NACA 24 ? ?Longitudinal, latitudinal, directional stability, and control.
X-4 #40April 27, 1951W.P. Jones46-677NACA 25 ? ?Same as flight 39.
X-4 #41May 3, 1951W.P. Jones46-677NACA 26 ? ?Same as flight 39.
X-4 #42May 9, 1951Scott Crossfield46-677NACA 27 ? ?Same as flight 39.
X-4 #43May 16, 1951Scott Crossfield46-677NACA 28 ? ?Same as flight 39.
X-4 #44May 18, 1951Scott Crossfield46-677NACA 29 ? ?Same as flight 39.
X-4 #45May 29, 1951Scott Crossfield46-677NACA 30 ? ?Same as flight 39.
X-4 #46August 20, 1951W.P. Jones46-677NACA 31 ? ?First flight with thick trailing edge on speed brakes.
X-4 #47October 2, 1951Scott Crossfield46-677NACA 32 ? ?Stability and control with thick trailing edge.
X-4 #48October 5, 1951Scott Crossfield46-677NACA 33 ? ?Lift-to-drag variation using various speedbrake settings.
X-4 #49October 9, 1951Scott Crossfield46-677NACA 34 ? ?Landings at various lift-to-drag ratios.
X-4 #50October 11, 1951Scott Crossfield46-677NACA 35 ? ?Same as flight 49.
X-4 #51October 12, 1951W.P. Jones46-677NACA 36 ? ?Same as flight 49.
X-4 #52October 17, 1951W.P. Jones46-677NACA 37 ? ?Constant speed-drag ratios.
X-4 #53October 18, 1951Joseph Walker46-677NACA 38 ? ?NACA pilot check; handling qualities.
X-4 #54October 19, 1951Joseph Walker46-677NACA 39 ? ?Maneuvers and speed runs.
X-4 #55October 24, 1951W.P. Jones46-677NACA 40 ? ?General stability and control.
X-4 #56March 6, 1952W.P. Jones46-677NACA 41 ? ?Lift-to-drag at various speedbrake settings.
X-4 #57March 13, 1952W.P. Jones46-677NACA 42 ? ?Directional trim change invest.
X-4 #58March 17, 1952W.P. Jones46-677NACA 43 ? ?Lift-to-drag variation with speedbrakes.
X-4 #59March 21, 1952W.P. Jones46-677NACA 44 ? ?Lift-to-drag variation studies.
X-4 #60March 25, 1952W.P. Jones46-677NACA 45 ? ?Dynamic stability invest.
X-4 #61March 26, 1952W.P. Jones46-677NACA 46 ? ?Same as flight 60.
X-4 #62March 27, 1952S.P. Butchart46-677NACA 47 ? ?NACA pilot check.
X-4 #63May 19, 1952W.P. Jones46-677NACA 48 ? ?Check flight with thickened trailing edge on elevons.
X-4 #64August 6, 1952Scott Crossfield46-677NACA 49 ? ?Stability and control with thickened elevons.
X-4 #65August 11, 1952-46-677NACA 50 ? ?Aborted; engine malfunction.
X-4 #66September 16, 1952-46-677NACA 51 ? ?Aborted; instrument malfunction.
X-4 #67September 22, 1952-46-677NACA 52 ? ?-
X-4 #68September 23, 1952Scott Crossfield46-677NACA 53 ? ?Stability and control with thickened elevons.
X-4 #69March 27, 1953Scott Crossfield46-677NACA 54 ? ?Same as flight 68.
X-4 #70April 29, 1954Scott Crossfield46-677NACA 55 ? ?Airspeed calibration with thickened elevons.
X-4 #71April 30, 1954Scott Crossfield46-677NACA 56 ? ?High-lift stability and control.
X-4 #72May 20, 1954S.P. Butchart46-677NACA 57 ? ?Dynamic stability without thickened elevons.
X-4 #73July 1, 1954S.P. Butchart46-677NACA 58 ? ?Same as flight 72.
X-4 #74July 3, 1954S.P. Butchart46-677NACA 59 ? ?Same as flight 72.
X-4 #75July 3-August, 1954George Cooper46-677NACA 60 ? ?NACA pilot check for Ames pilot.
X-4 #76August 11, 1954John McKay46-677NACA 61 ? ?NACA pilot check.
X-4 #77August, 1954-46-677NACA 62 ? ?Dynamic Stability.
X-4 #78August, 1954-46-677NACA 63 ? ?Dynamic Stability.
X-4 #79August 31, 1954-46-677NACA 64 ? ?NACA pilot check.
X-4 #80September, 1954-46-677NACA 65 ? ?NACA pilot check.
X-4 #81September, 1954-46-677NACA 66 ? ?NACA pilot check.
X-4 #82September, 1954-46-677NACA 67 ? ?Aileron pulses, low-speed turns with dive brakes.

See also

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