A very important development in aerospace propulsion that will transform high-speed aviation.

SABRE (Synergistic Air-Breathing Rocket Engine) - a hypersonic precooled hybrid air breathing rocket engine - could bring about a revolution in the future of air and space travel. Reaction Engines Limited (REL) is a British aerospace company based in Oxfordshire, England, founded in 1989 by Alan Bond (lead engineer on the British Interplanetary Society's Project Daedalus) and Richard Varvill and John Scott-Scott (the two principal Rolls-Royce engineers from the RB545 engine project). The company conducts research into space propulsion systems, centred around the development of the Skylon re-usable SSTO spaceplane.

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