The test of an experimental hypersonic jet ended in failure when it spun out of control and crash into the Pacific Ocean just 15 seconds after launch about 2.35pm eastern time today.The US Air Force's X-51A Waverider was designed to travel at Mach 6 -- so fast it could fly from London to New York in 45 minutes.
Instead, a control fin failed and the unmanned aircraft spun out of control before the primary rocket could fire.
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