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The Kuznetsov NK-93, developed in the Soviet Union, was once hailed as one of the most fuel-efficient jet engines ever designed. Featuring a hybrid propfan design that combined turbofan efficiency with propeller-like thrust, it promised dramatic fuel savings and reduced noise. Despite successful tests in the 1980s, the engine vanished after the collapse of the Soviet Union, never reaching mass production due to funding cuts, political shifts, and changing aviation priorities. Important Details:
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