Boeing and the US Air Force tested a supersonic combustion ramjet engine on May 26 with the longest hypersonic flight in history. The X-51A WaveRider was dropped from a B-52 and flew for nearly three and a half minutes, flying at five times the speed of sound – Mach 5. The unmanned aerial vehicle was tested off the southern California coast around 10 a.m. on May 26, and it flew autonomously for more than 200 seconds, but then something then occurred that caused the vehicle to lose acceleration. But the teams who worked on the project are still calling the test a success.
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