Pratt & Whitney Wasp R-1340 SC1, Radial 9 Engine National Air and Space Museum. Click to open image viewer. CC0 Usage Conditions Apply Click for more ... The Wasp R-1340 remained in production until ...

The Wasp Major was Pratt & Whitney Aircraft's last and largest piston engine. Its cylinders were in four rows, arranged in a spiral for better cooling. Initially producing 2,237 kW (3,000 shp), later ...

Radial engines weren't new (the Wright R-790 Whirlwind had already seen use), but this was an evolution. Named for the buzzing sound it emitted, the Wasp was a smoothly-operating engine enhanced ...