The first scramjet, an airbreathing jet engine capable of pushing an aircraft beyond Mach 5, was successfully flown in the early 1990s. But while pretty much any other technology you could imagine ...
ACES (Airbreathing Cold Engine Start) will design and build a system which will allow a JetCat P90-SXi miniature turbojet engine to start after being cold-soaked to -50 degrees Fahrenheit.
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