4, 1948, by John Martin, a Douglas test pilot. The rocket engine was rated at 6,000 pounds of thrust. The jet engine was for takeoff and climbing to altitude and the four-chambered rocket engine was for reaching supersonic speeds. The third Skyrocket had the jet engine and the rocket engine but was also modified so it could be air-launched. This aircraft was modified so it could be air-launched from a P2B-1S (Navy designation for the B-29) carrier aircraft. The second was equipped with a turbojet engine replaced in 1950 with a Reaction Motors Inc. The first of the three D-558-IIs had a Westinghouse J34-40 jet engine and took off under its own power. ![]() Fully fueled it weighed from about 10,572 pounds to 15,787 pounds depending on configuration. It was 12 feet, 8 inches in height and had a wingspan of 25 feet. The D-558-2 was a single-place, 35-degree swept-wing aircraft measuring 42 feet in length. Particular attention was given to the problem of "pitch-up," a phenomenon often encountered with swept-wing configured aircraft. The mission of the D-558-2 program was to investigate the flight characteristics of a swept-wing aircraft at high supersonic speeds. ![]() Three D-558-2 "Skyrockets" were built by Douglas Aircraft, Inc.
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