Lockheed Martin is working a new unmanned plane – SR-72 – that is designed to reach Mach 6 or 3,600mph.
Engineers at Lockheed Martin’s SkunkWorks R&D centre are working on a successor to the Blackbird SR-71 spy plane, which in 1976 flew test pilots from New York to London in less than two hours. The unmanned SR-72 will use an engine that combines a turbine and a ramjet to reach its top speed of Mach…
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