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List of X-4 flights

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X-4 pilots

PilotAgencyFlightsAircraft
A.BoydUSAF146-677
Frank EverestUSAF446-677
R.L. JohnsonUSAF146-677
J.S. NashUSAF146-677
Chuck YeagerUSAF746-677
S.P. ButchartNACA446-677
George CooperNACA146-677
Scott CrossfieldNACA2946-677
John GriffithNACA746-677
W.P. JonesNACA1446-677
John McKayNACA146-677
Joseph WalkerNACA146-677
Charles TuckerNorthrop3146-676/46-677

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 familiarization.
X-4 #14September-November, 1950J.S. Nash46-677USAF 14??Air Force flight. Pilot familiarization. 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 familiarization.
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.
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