The Wasp was Pratt & Whitney's first engine. The prototype produced 425 hp (316 kW) and and weighed only 650 lb (295 kg). The Wasp first flew in 1926.

The R-1340 was in production from 1925 - 1960. Almost 35,000 were produced.

models

• Wasp C-1: 420 hp (313 kW)
• R-1340-16: 550 hp (410 kW)
• R-1340-27: 500 hp (373 kW)
• R-1340-51: 600 hp (447 kW)
• R-1340-57: 600 hp (447 kW)

specifications

• 9 cylinder, air-cooled, radial
• displacement: 1,344 cubic inches (22 litres)
• Bore x stroke: 5.75 x 5.75 in

used by

• Bellanca Skyrocket
• Boeing F4B/P-12
• Boeing Model 40
• Boeing P-26 Peashooter
• Curtiss O-52 Owl
• Ford Trimotor
• Loening OL-8
• North American AT-6 Texan/ Harvard
• Sikorsky UH-19 Chickasaw