Beschreibung : Second test. The Pegasus fired successfully and released the test vehicle at an altitude of about 29,000 metres (95,000 ft). After separation, the engine`s air intake was opened, the engine ignited, and the aircraft then accelerated away from the rocket reaching Mach 6.83 or 7,401 km/h (4,600 mph). Fuel was flowing to the engine for 11 seconds, a time in which the aircraft traveled more than 24 km. Following Pegasus booster separation, the vehicle experienced a small drop in speed but the scramjet engine afterward accelerated the vehicle in climbing flight.
Edwards post stamp.

USA 2710 - picture enhanced ?

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X-43A (HYPERSONIC SCRAMJET SPACEPLANE) · TEST FLIGHTS