The SR-72 could be capable of flying at Mach 6 said Lockheed Martin
Lockheed Martin has begun work on a successor to the supersonic Blackbird SR-71 spy plane.
The unmanned SR-72 will use an engine that combines a turbine and a ramjet to reach its top speed of Mach 6 - about 3,600mph (5,800km/h).
Like its predecessor, the SR-72 will be designed for high-altitude surveillance but might also be fitted with weapons to strike targets.
Lockheed said the aircraft should be operational by 2030.
http://www.bbc.co.uk/news/technology-24803511
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