Saturn AL-41
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The NPO Saturn AL-41F is a Russian turbofan engine, designed for supercruise flight. Originally developed for the Mikoyan Project 1.44, the engine was built around the geometry of the AL-31F, making it compatible with existing airframes, including the Sukhoi Su-27 series. The engine is reported to have recently entered low rate initial production for use in the Su-34 Fullback. Specifications are not disclosed yet, but it is described by most sources as being in the 40.000 lbf class, 10:1 thrust to weight ratio.
