Hypersonic speeds - Mach 5 and above - are currently under serious Investigation by the US Defense Advanced Research Projects Agency (DARPA) and US Air Force Research Laboratory (AFRL). Results are being analysed of a recent 'free-flight' test of a hypersonic vehicle designed by Lockheed Martin and equipped with an Aerojet Rocketdyne scramjet engine. The vehicle was released by a B-52 carrier aircraft.
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