Xiamen University

Boeing X-51A Waverider hits 6 times speed of sound

The X-51A Waverider, shown here in an Air Force illustration, reportedly hit speeds of Mach 6 during a test flight this week. The X-51A Waverider is powered by a Pratt Whitney Rocketdyne SJY61 scramjet engine.   WASHINGTON — An experimental aircraft has set a record for hypersonic flight, flying more than 3 minutes at Mach 6 – six times the speed of sound. The X-51A Waverider was released from a B-52 Stratofortress off the southern California coast Wednesday morning, the Air Force reported on its website. Its scramjet engine accelerated the vehicle to Mach 6,
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