List of X-4 flights

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X-4 pilots[edit]

Pilot Agency Flights Aircraft
A.Boyd USAF 1 46-677
Frank Everest USAF 4 46-677
R.L. Johnson USAF 1 46-677
J.S. Nash USAF 1 46-677
Chuck Yeager USAF 7 46-677
S.P. Butchart NACA 4 46-677
George Cooper NACA 1 46-677
Scott Crossfield NACA 29 46-677
John Griffith NACA 7 46-677
W.P. Jones NACA 14 46-677
John McKay NACA 1 46-677
Joseph Walker NACA 1 46-677
Charles Tucker Northrop 31 46-676/46-677

X-4 flights[edit]

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

See also[edit]

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