The Douglas D-558-II Skyrocket was a three-aircraft swept-wing research family flown from 1948 to 1956 in a joint Navy, NACA, and Douglas program. The aircraft investigated swept-wing pitch-up, stability, structural loads, and the relationship between wind-tunnel predictions and flight behavior. On November 20, 1953, Scott Crossfield flew the second Skyrocket to Mach 2.005, the first flight above twice the speed of sound. Turbojet, combined jet-and-rocket, and all-rocket configurations served different phases of the research.
Future launches and major activity directly linked to this vehicle family.