Pratt & Whitney R-985

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The Pratt & Whitney R-985 Wasp Junior was an 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 5-3/16" and 5-3/16".

It was used on numerous light aircraft and has a good reputation for being dependable. Most versions produced 450 hp.

[edit] Specifications (R-985)

General characteristics

• Type: 9-cylinder air-cooled radial engine
• Bore: 5.2 in (132 mm)
• Stroke: 5.2 in (132 mm)
• Displacement: 985 in³ (16.1 L)
• Dry weight:

Components

• Cooling system: Air-cooled

Performance

• Power output: 450 hp (335 kW)
• Specific power: 0.46 hp/in³ (20.8 kW/L)
• Power-to-weight ratio: 0.67 hp/lbs (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] External link

• http://www.pratt-whitney.com/about_history_classic_r985.asp
• http://www.hill.af.mil/museum/photos/wwii/r985.htm