RISKY SPEED: With first flight of the X-51A WaveRider hypersonic scramjet engine demonstrator now scheduled for May 25, expectations are heightened as a result of last month’s failure of the HTV-2 hypersonic glider test (Aerospace DAILY, April 27, 28). The U.S. Air Force Research Laboratory/Defense Advanced Research Projects Agency X-51 will be dropped from its B-52 mothership off California and boosted to Mach 4.5 by a rocket motor. The booster will then separate and the scramjet will ...

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