15 August 2012 Updated at 19:15 GMT
Hypersonic jet Waverider fails Mach 6 test
The Waverider's engine was supposed to have ignited four seconds after it was released
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The US Air Force has said an attempt to fly its hypersonic jet Waverider at Mach 6 (3,600mph; 5795km/h) failed.
link-
http://www.bbc.com/news/technology-19277620