Experimental high-speed research plane with combined propulsion: turbo-jet for take-off and rocket engine for high-altitude flight. First flew on February 4, 1948. In August 1951 after deploying from Boeing P2B-1S (B-29) D-558-2 reached a speed of 1992kph and an altitude of 24230m. On August 31, 1953 the aircraft reached an altitude of 25370m and on November 20, 1953 set a speed record of 2.05M. 3 built.

Engine: 1 x Westinghouse J4-WE-22 turbo-jet, 13.3kN and 1 x Reaction Motors XLR-8 rocket engine, 26.7kN

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