The Pratt & Whitney R-1830 Twin Wasp is an American air-cooled radial aircraft engine. It has 14 cylinders, arranged in two rings of seven. It displaces 1,830 cu in and its bore and stroke are both 5.
R-1830 on display at the Imperial War Museum Duxford
R-1830 mounted on the left wing of an ex-military Douglas C-47
RAF Dakota's Twin Wasp out for servicing
Pratt & Whitney R-1830 "Twin Wasp" (sectioned)
Nakajima Sakae
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The Nakajima Sakae was a two-row, 14-cylinder air-cooled radial engine used in a number of combat aircraft of the Imperial Japanese Navy and Imperial Japanese Army before and during World War II.
Nakajima Sakae engine on display at the Flying Heritage & Combat Armor Museum
USS Suwannee after the Kamikaze attack of 25 October 1944. Parts of the A6M5 Kamikaze-Zero's Nakajima Sakae 21, 14-cylinder radial engine were found in the vicinity of the hit. Cylinder heads are destroyed, connecting rods and crankshaft are visible.