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). via Pocket http://www.bbc.co.uk/news/technology-24803511#TWEET945251
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