Unlocking the future of space access and hypersonic flight

Welcome to Reaction Engines Ltd – pioneering the next generation of hypersonic and space access propulsion.

Reaction Engines is a UK-based company formed in 1989 to design and develop the technologies needed for a new class of innovative hypersonic propulsion system – the Synergetic Air-Breathing Rocket Engine (SABRE).

We have achieved a breakthrough in aerospace engine technology by developing ultra-lightweight heat exchangers. Developed for our high speed SABRE engines, the heat exchangers stop engine components from overheating at high flight speeds.

SABRE class engines will enable aircraft to fly over five times the speed of sound in the atmosphere and allow space launch vehicles to be built that will radically improve the affordability and responsiveness of access to space.

Our heat exchanger technology has the potential to revolutionise what can be achieved with thermal management across a range of industries, from aerospace to motorsport, industrial processes, and the energy industry.

In addition to the SABRE development programme, Reaction Engines offers a unique and extensive range of capabilities, from propulsion systems and advanced heat exchanger design and development, through to advanced manufacturing and precision machining. 

We have begun partnering with aerospace suppliers to deliver a ground-based SABRE demonstrator engine. There’s never been a better time to join us on the journey.

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Our partners

We are supported by a £60m funding commitment from the UK Government via the UK Space Agency and the European Space Agency and received a minority investment of £20.6m from BAE Systems in 2015. More recently we have raised a further £26.5m in a strategic fundraise, securing backing from some of the most influential names in aerospace and finance including Boeing and Rolls Royce. 







“As Reaction Engines unlocks advanced propulsion that could change the future of air and space travel, we expect to leverage their revolutionary technology to support Boeing’s pursuit of hypersonic flight.”
Steve Nordlund, Vice President, Boeing HorizonX


“We look forward to working with REL and assisting with the development of their technology, and we plan to incorporate this technology into our own future products.”
Paul Stein, Chief Technology Officer, Rolls-Royce

Reaction Engines locations and facilities

Reaction Engines Inc

U.S subsidiary office based in Littleton, Colorado.

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Test Facility 2 (TF2)

HTX test programme location at Front Range Airport, Colorado. Test site operational in 2018

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Test facility 1 (TF1)

SABRE Core Engine test site under construction at Westcott Venture Park. Test site operational from 2020

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Head Quarters

Main office location on Culham Science Centre campus, 20 minutes from the Harwell Space Gateway and half an hour from Oxford City centre with excellent links to London.