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An aircraft capable of hitting 4,520 mph (nearly seven times the speed of sound) is ludicrous to even think about, but the North American X-15 achieved this, defying comparison to any other ...
National Security Journal on MSN
The Mach 6.7 X-15 Rocket Plane Has A Message for the U.S. Air Force
America built the X-15 to get flight data in the unknown between airplanes and spacecraft. -The rocket-powered, Inconel-X research plane, air-dropped from a B-52 and driven by a throttleable XLR99, ...
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