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A jet engine that uses ram pressure to compress incoming air, and where the airflow throughout the entire engine is at supersonic speeds.
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What technical problems stopped scramjets from being used on hypersonic aircraft?
Let's imagine aerodynamicists design can design a scramjet that can reliably run for a thousand cycles, but the engine is useless if the aircraft's skin can't handle the high speeds. … Commercial airliners (consumers) weren't even willing to pay for the supersonic Concorde, so you can easily discount them from buying scramjet-powered aircraft. That leaves the military. …