New details on Lockheed Martin’s successor to the SR-71 Blackbird, the SR-72, that will be twice as fast as its predecessor with a cruising speed of Mach 6, or six times the speed of sound.

Images credit Lockheed Martin

The secret hypersonic replacement for the iconic SR-71 “Blackbird,” a 4,000-mile-per-hour reconnaissance drone, known as the SR-72.

The new hypersonic military drone, will be able to take spy photos and attack targets at speeds of up to Mach 6.

The aircraft is now under development by aeronautical engineers at Lockheed Martin and Aerojet Rocket­dyne, in California.

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