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X-51A Waverider
X-51A Waverider, powered by Pratt Whitney Rocketdyne SJY61 scramjet engine, prepares for hypersonic flight by riding its own shockwave, accelerating to nearly Mach 6 (U.S. Air Force graphic)
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Photo by: U.S. Air Force |  VIRIN: 100520-F-9999B-111.JPG
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