Pratt & Whitney R-985
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The Pratt & Whitney R-985 Wasp Junior was a radial engine widely used in American aircraft starting in the 1930s. It was a scaled-down version of the original R-1340, and the second in the Wasp family. It was a single-row, 9-cylinder air-cooled radial design. Displacement was 985 cubic inches (16.1 liters); bore and stroke were each 53⁄16 in (132 mm).
It was used on numerous light aircraft and has a good reputation for being dependable. Most versions produced 450 hp.
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[edit] Specifications (R-985)
General characteristics
- Type: 9-cylinder air-cooled radial engine
- Bore: 5.1875 in (132 mm)
- Stroke: 5.1875 in (132 mm)
- Displacement: 986.75 in³ (16.17 L)
- Length: 41.59 in (1,056 mm)
- Height: 45.75 in (1,162 mm)
- Dry weight: 690 lb (313 kg)
Components
- Valvetrain: 1 inlet and 1 exhaust valve per cylinder
- Fuel system: 1 Stromberg carburetor
- Fuel type: 80 octane
- Cooling system: Air-cooled
Performance
- Power output: 450 hp (335 kW)
- Specific power: 0.46 hp/in³ (20.8 kW/L)
- Compression ratio: 6.0:1
- Power-to-weight ratio: 0.67 hp/lb (1.1 kW/kg)
[edit] Related contents
- Pratt & Whitney Wasp series
- R-1340 Wasp
- R-1830 Twin Wasp
- R-1535 Twin Wasp Junior
- R-2800 Double Wasp
- R-4360 Wasp Major
[edit] Applications
- Airspeed Oxford
United Kingdom - Air Tractor AT-300
- Avro Anson
- Barkley-Grow T8P-1
- Beechcraft Staggerwing
- Beech Model 18
- Bellanca CH-300
- De Havilland Canada DHC-2 Beaver
- Grumman Goose
- Howard DGA-11
- Howard DGA-15
- Lockheed Electra
- Lockheed Model 12 Electra Junior
- PWS-24
- Sikorsky R-5
- Spartan Executive
- Vought Kingfisher
- Vultee BT-13 Valiant
- AgCat Models A, B, & Original Light Frame
