The Rolls-Royce/Snecma Olympus 593 was a reheated (afterburning) turbojet which powered the supersonic airliner Concorde. Initially a joint project between Bristol Siddeley and Snecma based on Bristol's Olympus engine, Rolls-Royce Limited acquired Bristol, making it a division of Rolls-Royce.
Until Concorde's regular commercial flights ceased, the Olympus turbojet was unique in aviation as the only afterburning turbojet powering a commercial aircraft.
Installed in Concorde and while operating at Mach 2, Rolls-Royce engineers claimed that it was the world's most efficient jet engine [Wikipedia.org]
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