The Pratt & Whitney R-985 Wasp Junior is a 9-cylinder aircraft radial piston air-cooled engine manufactured by Pratt & Whitney from the 1930s to the 1950s. The designation “R-985” in the label means “radial engine with a volume of 985 cubic inches,” which corresponds to a volume of 16.1 liters. The first versions gave out power of 300 hp (220 kW), later 450 hp engines became widely used. (340 kW)
| Pratt & Whitney R-985 Wasp Junior | |
|---|---|
 | |
| Manufacturer | Pratt & whitney |
| Years of production | 1929-1953 |
| Specifications | |
| Volume | 16.14 l |
| Power | 300 l. with. (220 kW) |
| Power density | 18.5 kW / l |
| Compression ratio | 6.0: 1 |
| Bore | 132 mm |
| Piston stroke | 132 mm |
| Number of cylinders | 9 |
| Valves | 18 |
| Fuel type | gasoline 80/87 |
| Specific fuel consumption | 220 kg / (hp · h) |
| Dimensions | |
| Length | 1057 mm |
| Diameter | 1162 mm |
| Dry weight | 277 kg |
Wasp Junior installed on many small civilian and military aircraft, including small transporters, general aviation, training aircraft, agricultural aircraft and helicopters. A total of 39,000 engines were built, many of which are still in operation today.
Modifications
- Wasp junior a
- US military version: R-985-1. [one]
- 300 l. with. at 2000 rpm when taking off at sea level.
- Wasp Junior TB, TB2
- US military version: R-985-9, −11, −11A, −21, −46. [one]
- 420 l. with. at 2200 rpm at sea level, 440 l. with. at 2300 rpm during takeoff. The early B-series was designed for use at sea level.
- Wasp Junior SB, SB2, SB3
- US military version: R-985-13, −17, −23, −33, −48, −50; R-985-AN-2, −4, −6, −6B, −8, −10, −12, −12B, −14B. [1] [2]
- 400 l. with. at 2200 rpm at an altitude of 460 m, 450 l. with. at 2300 rpm during takeoff. [3] B-series, designed for use at height.
- Wasp Junior T1B2, T1B3
- US military version: R-985-25, −27, −39, −39A; R-985-AN-1, −1A, −3, −3A. [1] [2]
- 450 l. with. at 2300 rpm at an altitude of 450 m and during takeoff. Improved B-Series for sea level operation.
- Wasp junior b4
- US military version: R-985-AN-5, −7. [1] [2]
- 450 l. with. at 2300 rpm at an altitude of 700 m and during takeoff. Vertical installation, for helicopters.
- Wasp Junior SC-G
- 525 l. with. at 2700 rpm at an altitude of 2900 m, 600 l. with. at 2850 rpm during takeoff. Experimental version with increased power and reduced gear screw.
Notes
- ↑ 1 2 3 4 5 Pratt & Whitney (1956), p. A1
- 2 1 2 3 FAA Type Certificate Data Sheet TC 5E-1
- ↑ Pratt & Whitney (1956), pp. A2-A3
Links
- R-985 on the Pratt & Whitney website
- Tsygulev. Aircraft engines of foreign air forces : [ rus ] . - M .: Military publishing house NPO USSR, 1939.
- Gunston, Bill. World Encyclopedia of Aero Engines . Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
- Pratt & Whitney (1956), Index of Wasp Jr. & R-985 Designated Engines , < http://enginehistory.org/P&W/R-985/Wasp%20Jr%20Index.pdf > . Checked January 8, 2016. Archived copy of October 31, 2010 on Wayback Machine . Available from the Aircraft Engine Historical Society's reference page .
- Wasp Jr. A: Type Certificate Data Sheet ATC 39 , < http://rgl.faa.gov/Regulatory_and_Guidance_Library%5CrgMakeModel.nsf/0/41FFECB71E9B0BB88525670D004C87E1?OpenDocument > . Checked January 8, 2016.
- Wasp Jr. SB, T1B2, B4: Type Certificate Data Sheet E-123 , < http://rgl.faa.gov/Regulatory_and_Guidance_Library%5CrgMakeModel.nsf/0/8C23CF4CA942EAB58525670D005524CC?OpenDocument > . Checked January 8, 2016.
- Wasp Jr. TB: Type Certificate Data Sheet TC 85 , < http://rgl.faa.gov/Regulatory_and_Guidance_Library%5CrgMakeModel.nsf/0/8DACDDFBA584E7248525670D005E1BF7?OpenDocument > . Checked January 8, 2016.
- Wasp Jr. Military Model: Type Certificate Data Sheet TC 5E-1 , < http://rgl.faa.gov/Regulatory_and_Guidance_Library%5CrgMakeModel.nsf/0/55F5D74FC76375D58525676A00677446?OpenDocument > . Checked January 8, 2016.