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Pratt & Whitney R-985 Wasp Junior Aircraft Engine

Produced between 1929 and 1953 the Pratt & Whitney R-985 Wasp Junior was a nine cylinder air-cooled radial aero engine developed from the higher capacity Pratt & Whitney R-1340 Wasp. When first produced the R-985 Wasp Junior was rated at 300hp, as the engine was developed over the decades it eventually produced 450hp combining higher boost pressures with higher maximum RPM and compression ratios.

Pratt & whitney pw-985

 

Pratt & Whitney had the foresight to use the same engine mount dimensions on the Wasp and the Wasp Junior, this allowed the engines to be swapped in order to provide more or less power if required.

Aircraft powered by the Pratt & Whitney R-985 Wasp Junior

Airspeed Oxford V Air Tractor AT-300
Avro Anson Mk V Barkley-Grow T8P-1
Beechcraft Model 18 Beechcraft Staggerwing UC43 D17
Beechcraft Staggerwing Beech C-45 Expeditor
Bell XV-3 Bellanca 300-W
Berliner-Joyce OJ Boeing-Stearman Model 75 conversions
Bratukhin G-3 CAC Winjeel
de Havilland Canada DHC-2 Beaver de Havilland Canada L-20/U-6
Douglas C-26 Dolphin Fleetwings BT-12
Grumman G-164 Ag Cat Grumman G-21 Goose
Howard DGA-11 Howard DGA-15P
Koolhoven F.K.51 Lockheed Model 10-A Electra
Lockheed Model 12-A Electra Junior Max Holste MH.1521 Broussard
McDonnell XHJH Whirlaway‎ North American BT-14
PWS-24bis Seversky BT-8
Sikorsky H-5 helicopter Sikorsky S-51 helicopter
Sikorsky S-39 amphibian Snow S-2B and S-2C
Spartan Executive 7W Stinson Reliant SR-9F
Stinson Reliant SR-10F Vought OS2U Kingfisher
Vultee BT-13 Valiant Waco S3HD
Waco SRE Aristocrat Weatherly 201 series
Weatherly 620  
   

Pratt & Whitney R-985 Wasp Junior SB Specifications:

  • Type: 9-cylinder supercharged air-cooled radial piston engine
  • Bore: 5+3⁄16 in (132 mm)
  • Stroke: 5+3⁄16 in (132 mm)
  • Displacement: 985 cu in (16.14 L)
  • Length: 41.59 in (1,056 mm)
 
  • Diameter: 45.75 in (1,162 mm)
  • Dry weight: 640 lb (290 kg)
  • Valve train: Two overhead valves per cylinder, pushrod-actuated
  • Supercharger: Single-speed gear-driven General Electric centrifugal supercharger, with impeller driven at 10 times crankshaft speed
  • Fuel type: 80/87 grade aviation gasoline
  • Reduction gear: Direct drive
  • Power output:
    400 hp (298 kW) at 2,200 RPM up to 5,000 ft (1,500 m)
    450 hp (336 kW) at 2,300 RPM for takeoff
  • Specific power: 0.406 hp/in³ (18.5 kW/L)
  • Compression ratio: 6.0:1
  • Power-to-weight ratio: 0.625 hp/lb (1.03 kW/kg)
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    Pratt & Whitney PW-985 14b
     

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