Pratt & Whitney Wasp series


The Pratt & Whitney Wasp was the civilian name of a family of air-cooled, radial piston engines developed in the 1920s, 1930s, and 1940s.
The Pratt & Whitney Aircraft Company was founded in 1925 by Frederick B. Rentschler, who had previously been the president of Wright Aeronautical. He brought with him some of Wright's best designers, and the new team quickly came up with their first design, the R-1340 Wasp. The name "Wasp" was suggested for the first model by Rentschler's wife, Faye.

Wasp series

R-985 Wasp Junior
  • Nine-cylinder, single-row, air-cooled radial
  • Bore x stroke:
  • Displacement:
R-1340 Wasp
  • Nine-cylinder, single-row, air-cooled radial
  • Bore x stroke:
  • Displacement:
R-1535 Twin Wasp Junior
  • 14-cylinder, two-row, air-cooled radial
  • Bore x stroke:
  • Displacement:
  • Power output:
R-1830 Twin Wasp
  • 14-cylinder, two-row, air-cooled radial
  • Bore x stroke:
  • Displacement:
  • Power output:
R-2000 Twin Wasp
  • 14-cylinder, two-row, air-cooled radial
  • Bore x stroke:
  • Displacement:
  • Power output:
R-2180-E Twin Wasp E
  • 14-cylinder, two-row, air-cooled radial
  • Bore x stroke:
  • Displacement:
  • Power output:
R-2800 Double Wasp
  • 18-cylinder, two-row, air-cooled radial
  • Bore x stroke:
  • Displacement:
  • Power output:
R-4360 Wasp Major
  • 28-cylinder, four-row, air-cooled radial
  • Bore x stroke:
  • Displacement:
Note: the designations refer to the engine configurations as follows: "R" = Radial, followed by the approximate displacement in cubic inches.