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Hypersonic Plane on the Drawing Board

The successor to the world’s fastest plane is in the works, according to Lockheed Martin. The hypersonic SR-72, when operational, could boast speeds up to Mach 6, six times the speed of sound, and double the speed of the now-retired SR-71 Blackbird, which has held the speed record since 1976. In a statement, Lockheed Martin said the “son of Blackbird” would be so fast that “an adversary would have no time to react or hide.” The plane is likely to be unmanned. “Hypersonic aircraft, coupled ...

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