-Air-launched from a B-52, the X-15 reached a record-breaking speed of Mach 6.7 and flew high enough to earn astronaut wings for eight of its pilots. -While never intended as a weapon, the X-15 was a ...
Stratolaunch has finally found a use for the world’s largest airplane. Twice in the last five months, the company launched a hypersonic vehicle over the Pacific Ocean, accelerated it to more than five ...
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