A turbofan engine, on the other hand, is designed to move huge amounts of air to propel an aircraft forward. At lower subsonic speeds, it does this quite well. Faster than that, aerodynamic drag ...
Hypersonic start-up Hermeus has completed ground testing of its Quarterhorse Mk 1 vehicle and is preparing to launch a flight test campaign for the subsonic jet. The Atlanta-based firm on 17 December ...
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