Pratt & Whitney R-2180-A Twin Hornet
Pratt & Whitney R-2180-E Twin Wasp E

 

Pratt & Whitney R-2180 was the designations for two closely related radial engines developed in the United States by Pratt & Whitney. They had two rows of seven cylinders each.

Pratt & Whitney R-2180-A Twin Hornet - first run in 1936
Pratt & Whitney R-2180-E Twin Wasp E - first run in 1945