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The Military

Submission + - Hypersonic test aircraft pealed apart after 3 minutes of sustained Mach 20 speed (networkworld.com) 1

coondoggie writes: "The Defense Advanced Research Projects Agency's experimental Hypersonic Technology Vehicle (HTV-2), lost significant portions of its outer skin and became uncontrollable after three minutes of sustained Mach 20 speed last August. That was the conclusion of an independent engineering review board (ERB) investigating the cause of what DARPA calls a "flight anomaly" in the second test flight of the HTV-2."
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Hypersonic test aircraft pealed apart after 3 minutes of sustained Mach 20 speed

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