Only three of these aircraft were built, with one being destroyed and two operating successfully. The X-43 testbed aircraft ...
National Security Journal on MSNOpinion
The Mach 15 X-43D ‘Hypersonic Scramjet’ Has a Message for the U.S. Air Force
D. It Never Flew — and That Matters Now. -NASA’s X-43A proved that an air-breathing scramjet could fly at hypersonic speeds, ...
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