Concorde’s afterburners were one of its most iconic features, both visually and technically. Each of its four Rolls-Royce/Snecma Olympus 593 turbojet engines was fitted with reheat (afterburning) to deliver the enormous thrust needed for takeoff and acceleration through the transonic “sound barrier.” By injecting fuel directly into the hot exhaust and igniting it, the afterburners briefly boosted thrust by almost 20%, creating the brilliant blue-orange flame trail that became Concorde’s trademark sight at departure. They were used mainly during takeoff and the climb through Mach 1.7; once cruising at Mach 2, the aircraft could sustain supersonic speed on dry power alone without afterburner. Though thirsty and noisy, the reheat system gave Concorde its dramatic roar, its glowing exhausts, and its unmatched performance—helping it reach New York from London in under 3½ hours.
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