U.S. Air Force officials say the third, and possibly final, attempt to reach or exceed sustained speeds beyond Mach 5 with the X-51A hypersonic demonstrator is set for Aug. 14. Describing the X-51A as “the key to the next step in hypersonics,” Air Force Research Laboratory Aerospace Systems Director Doug Bowers says that even the mixed success of the initial X-51A flights has proved invaluable to advancing the state-of-the-art. Speaking at the American Institute of Aeronautics and ...

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