Pratt & Whitney R-985 Wasp Junior
| R-985 Wasp Junior | |
|---|---|
| Pratt & Whitney R-985 AN-1 mounted in a Boeing Stearman | |
| Type | Air-cooled 9-cylinder radial piston engine |
| National origin | United States |
| Manufacturer | Pratt & Whitney |
| First run | 1929 |
| Major applications | Beechcraft Model 17 Beechcraft Model 18 de Havilland Canada DHC-2 Beaver Grumman G-21 Goose Sikorsky H-5 Vought OS2U Kingfisher Vultee BT-13 Valiant |
| Produced | 1929-1953 |
| Number built | 39,037 |
| Developed from | Pratt & Whitney R-1340 Wasp |
| Developed into | Pratt & Whitney R-1535 Twin Wasp Junior |
The Pratt & Whitney R-985 Wasp Junior is a series of nine-cylinder, air-cooled, radial aircraft engines built by the Pratt & Whitney Aircraft Company from the 1930s to the 1950s. These engines have a displacement of 985 in3 (16 L); initial versions produced 300 hp (220 kW), while the most widely used versions produce 450 hp (340 kW).
Wasp Juniors have powered numerous smaller civil and military aircraft, including small transports, utility aircraft, trainers, agricultural aircraft, and helicopters. Over 39,000 engines were built, and many are still in service today.