Introduction The Pratt & Whitney R-1535 Twin Wasp Junior is a notable American aircraft engine that emerged during the 1930s, a pivotal decade for aviation development. Introduced in 1932, this engine represents a significant advancement in radial engine design, serving as a 14-cylinder variant of the earlier 9-cylinder R-985 model. Featuring a two-row, air-cooled configuration, …
Pratt & Whitney R-1535 Twin Wasp Junior
