EnginesWright R-1820-65 CycloneWright R-1820-65 CycloneWright R-1820-65 CycloneLayoutRadialCoolingAirFuelPetrolDisplacement29.88 LAircraft 2193119321933193419351936193719381939194019411942194319441945Fortress I20≈ 8 Jul 1941 – Sep 19418 Sep 1941 – 8 Sep 1941B-17C18≈ 10 Dec 1941 – May 1942