Four years after revealing plans to develop a Mach 6 strike-and-reconnaissance aircraft, Lockheed Martin says a raft of hypersonic technologies is now sufficiently mature to enable progress toward a flight demonstrator. The company’s secretive Skunk Works unit has been working since at least the early 2000s on the basic building blocks for an operational hypersonic vehicle, and it revealed to Aviation Week it was developing a scaled demonstrator for the SR-72, a proposed successor to ...


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