High Quality Content by WIKIPEDIA articles! The Pratt & Whitney R-1535 Twin Wasp Junior was an engine used in American aircraft in the 1930s. The engine was first introduced in 1932 as a 14 cylinder version of the 9-cylinder R-985. It was a two-row, air-cooled radial design. Displacement was 1,535 in (25.2 L); bore and stroke were 5-3/16 in and 5-3/16 in (131.8 mm and 131.8 mm). Pratt

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