The X-15 wasn’t just a plane – it was a rocket with wings. Designed at the height of the space race, it became the fastest aircraft ever flown, reaching speeds of Mach 6.7 and altitudes over 350,000 ...
National Security Journal on MSN
The Mach 6.7 X-15 ‘Hypersonic Rocket Plane’ Has a Message for the U.S. Air Force
The X-15 was a rocket-powered research aircraft that pushed human flight to the edge of space and deep into the hypersonic ...
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