Reaction Engines Limited is a British aerospace manufacturer based in Oxfordshire, England. In 1989, Reaction Engines was founded by Alan Bond (lead engineer on the British Interplanetary Society's Project Daedalus), 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 on the development of the Skylon re-usable SSTO spaceplane.