First flight of the X-51A scramjet demonstrator is now on track for early December while captive carriage tests on the NASA-operated B-52H mothership at Edwards Air Force Base, Calif., are set to begin in October.
A joint effort by the U.S. Air Force, Defense Advanced Research Projects Agency (DARPA), Pratt & Whitney Rocketdyne, and Boeing, the hypersonic vehicle is designed to be the first air-breathing craft to demonstrate sustained speeds in excess of Mach 4 using a “logistically friendly” hydrocarbon fuel.
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