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The Air Force's Hypersonic X-15s Had a Top Speed of Mach 6.7

The Air Force's Hypersonic X-15s Had a Top Speed of Mach 6.7

nationalinterest.org

The X-15s set an absolute speed record of Mach 6.7 and an absolute altitude record of 354,000 feet which qualified several of its program pilots for …

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