Pratt & Whitney R-985 Wasp Junior

The Pratt & Whitney R -985 Wasp Junior is an air cooled aircraft engine of the U.S. manufacturer Pratt & Whitney. After the first test runs in 1929 the type was used from 1930 in civil and military aircraft and later also in helicopters ( Sikorsky H -5). After delivery of 39 037 engines, the production ended in 1953.

The nine-cylinder radial engine with mechanical supercharging by means of a centrifugal compressor with a displacement of 985 cubic inches (about 16 liters ) of the smallest of the P & W " Wasp " engine family.

Use (selection)

  • Airspeed Oxford
  • Avro Anson
  • Barkley -Grow T8P -1
  • Beechcraft Staggerwing
  • Beechcraft Model 18
  • De Havilland DHC-2 "Beaver"
  • Lockheed Electra
  • Lockheed Electra Junior
  • Max Holste Broussard
  • Vought Kingfisher
  • Pitts Samson
  • Howard DGA
  • Boeing Stearman
  • Stinson V -77 Gullwing

Technical data (R -985 -TB)

  • Bore 132 mm
  • Stroke 132 mm
  • Capacity: 16.14 l
  • Compression ratio: 6.0:1
  • Length: 1057 mm
  • Diameter: 1162 mm
  • Weight: 277 kg
Boeing-Stearman Model 75 Sikorsky H-5 Engine displacement Beechcraft Model 17 Staggerwing
659937
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