Scramjet reaches Mach 5
Discussion
http://www.flightglobal.com/articles/2010/05/27/34...
article said:
The Boeing Phantom Works-built X-51A Waverider achieved 140s burn of its Pratt & Whitney Rocketdyne-built air breathing scramjet engine and accelerated to 70,000ft (21,350m) and Mach 5
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