Wright R-3350 Duplex-Cyclone - Wikipedia
https://en.wikipedia.org/wiki/Wright_R-3350_Duplex-Cyclone
WEBThe Wright R-3350 Duplex-Cyclone is an American twin-row, supercharged, air-cooled, radial aircraft engine with 18 cylinders displacing nearly 3,350 cubic inches (54.9 L). Power ranged from 2,200 to over 3,700 hp (1,640 to 2,760 kW), depending on the model.
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