How Britain's Air Breathing Rocket Engine Would Have Worked... If The Builder Hadn't Gone Bankrupt.

Reaction Engines had been working on an innovative engine design named SABRE, this was intended to operate as an air breathing engine up to about mach 5 and then switch to a pure rocket engine cycle. The ultimate goal was to build an aircraft named 'Skyline' which could fly all the way to orbit without dropping stages, but the company was first and foremost focussed on demonstrating the engine design, and in particular, the pre-cooler which would be required to chill the incoming air down to usable temperatures so it could be compressed and then used to burn hydrogen in a rocket engine.

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