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scramjet| Supersonic jet engine under development in the early 1990s that uses oxygen from the atmosphere rather than liquid oxygen to burn its fuel. See jet propulsion, ramjet. |
| The world speed record for flying was broken in 2004 by a NASA-developed scramjet, which reached a speed of Mach 9.6, or 11,500 km/7,146 mi per hour. The scramjet was attached to a Pegasus rocket, and carried to an altitude of 12 km/7.5 mi by a B-52B launch aircraft. Upon release from the aircraft, the rocket boosted the scramjet to a height of 34 km/21 mi where it began its record-breaking flight. |
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