The Pratt & Whitney R-2180-E Twin Wasp E was a radial aircraft engine developed in the United States by Pratt & Whitney. It had two rows of seven cylinders each. Its only production application was on
A Saab Scandia powered by two P&W R-2180 Twin Wasp E engines
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)