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The Experimental Hypersonic Rocket Plane That Ushered in the Space Age

Chuck Yeager's historic supersonic flight in 1947 set off a firestorm of research into flight beyond the speed of sound. The most ambitious of these projects was the X-15 program, a top secret USAF program that aimed to test the limits of Mach 7. In X-15: The World's Fastest Rocket Plane and the Pilots Who Ushered in…

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