The Reaction Engines Scimitar is a derivative of the SABRE engine technology, but intended for airliners (the Reaction Engines A2 concept), rather than space launch applications. Consequently, most of the Scimitar engine technology is similar to Sabre but designed for much longer life.[1] Both engines are designed around existing gas turbine, and ramjet technology, but the Scimitar engine lacks the rocket features and has high bypass features for greater efficiency.[2]
The incorporation of lightweight heat exchangers in the main thermodynamic cycles of these engines is a new feature to aerospace propulsion.
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