Beskrivning : The X-51 performed its first fully successful flight test on its fourth test flight. The X-51 and booster detached from a B-52H and was powered to Mach 4.8 (3,200 mph; 5,100 km/h) by the booster rocket. It then separated cleanly from the booster and ignited its own engine. The test aircraft then accelerated to Mach 5.1 (3,400 mph; 5,400 km/h) and flew for 210 seconds until running out of fuel and plunging into the Pacific Ocean off Point Mugu for over six minutes of total flight time; this test was the longest air-breathing hypersonic flight.
Edwards illustrated special post stamp.

USA 2972 - image retouchée ?

Sida : future · Ref: USA 2972 

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Rymdhändelse :

X 51-A WAVERIDER · BOEING · UNMANNED SCRAMJET AIRCRAFT