Military Aviation News

Russia’s Su-57 Felon Stealth Fighter Just Got The Engine It Always Needed

12/12/2025

Russia’s Su-57 began life powered by the AL-41F1/117S, a deeply modernized Su-27 engine used as a stopgap while a true 5th-generation powerplant was developed. That engine, now designated AL-51F1 (177S), only flew on a Su-57 testbed in 2017 and has just entered low-rate production.

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