Beschreibung : The Boeing X-51 (also known as X-51 WaveRider) is an unmanned scramjet demonstration aircraft for hypersonic (Mach 6, approximately 4,000 miles per hour (6,400 km/h) at altitude) flight testing.
The X-51 completed its first powered flight successfully on 26 May 2010. It reached a speed of Mach 5 (3,300 mph; 5,300 km/h), an altitude of 70,000 feet (21,000 m) and flew for over 200 seconds; it did not meet the planned 300 second flight duration, however.
Special Postal cancel of Edwards.
Lollini Cover.

USA 2877 - picture enhanced ?

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X 51-A WAVERIDER · BOEING · UNMANNED SCRAMJET AIRCRAFT