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| R-985 Wasp Junior | |
|---|---|
| Name | R-985 Wasp Junior |
| Type | Radial piston aircraft engine |
| Manufacturer | Pratt & Whitney |
| First run | 1929 |
| Produced | 1929–1950s |
| Configuration | Single-row radial |
| Displacement | 985 cu in (16.1 L) |
| Power | 300–450 hp |
R-985 Wasp Junior The R-985 Wasp Junior is a single-row, nine-cylinder radial aircraft engine produced by Pratt & Whitney beginning in 1929. Designed as a scaled-down derivative of the larger R-1340 Wasp, the engine powered numerous civil and military types during the interwar and World War II eras, influencing designs by Boeing, Beechcraft, Fairchild, and Grumman.
The R-985 originated from design studies at Pratt & Whitney under the leadership of engineers tied to projects associated with Sikorsky, Curtiss, and Wright Aeronautical developments. Early development leveraged metallurgy advances demonstrated in work with General Electric and incorporated lessons from US Navy and United States Army Air Corps evaluations. The R-985 used a single-row radial layout with forged steel crankcases and aluminum alloy cylinders, reflecting material practices also employed by Rolls-Royce and BMW in contemporary engine programs. Certification processes involved test cycles at facilities linked to NACA and regulatory oversight by bodies similar to Civil Aeronautics Authority.
Basic specifications mirror documentation used across aircraft archives and maintenance manuals for types operated by Pan American World Airways, Trans World Airlines, and United States Postal Service contractors. The nine-cylinder configuration delivered approximately 300–450 horsepower depending on model and supercharging, with a displacement of 985 cubic inches (16.1 L). Cooling was air-based, following approaches used by Wright R-975 and Pratt & Whitney R-1340 families. Dimensions, weight, compression ratios, and propeller reduction gear details paralleled engineering practice seen in engines supplied to Douglas Aircraft Company and Lockheed Corporation for liaison and utility aircraft. Auxiliary systems included magnetos comparable to Scintilla and carburetion schemes akin to components from Marvel Schebler.
The R-985 saw extensive service across civil airlines like Eastern Air Lines and charter operators tied to Howard Hughes’s enterprises, as well as military users within the Royal Air Force, United States Navy, and United States Army Air Forces. It powered utility transports, trainers, and light bombers during the 1930s–1940s, often appearing on aircraft assigned to operations in theaters connected to North Africa Campaign and the Pacific War. Wartime production scaled with contracts coordinated between War Production Board and major assemblers such as Vought and Douglas, impacting logistics alongside components from Curtiss-Wright and Hamilton Standard. Postwar civil conversions saw the engine installed in executive transports and agricultural aircraft operated by companies like Grumman American.
Multiple factory and license-produced variants addressed supercharging, fuel grade, and mounting configurations for manufacturers such as North American Aviation and Stinson Aircraft Company. Models differed in compression ratio and accessory drives, mirroring approaches taken across variant families by Wright Aeronautical and Lycoming. Some versions were optimized for floatplane installations associated with operators like Pan Am’s flying boats and designs by Savoia-Marchetti-licensed constructors.
The R-985 powered a broad array of types including utility and liaison aircraft by Beechcraft (notably light transports), trainers produced by Fairchild Aircraft, and amphibians from Grumman and Consolidated Aircraft. It was installed in executive conversions for companies linked to Howard Hughes and in regional passenger aircraft used by American Airlines subsidiaries. Seaplane installations were common in operations connected to Pan American World Airways and island-hopping services in the Pacific Islands.
Examples survive in museum collections and flying restorations at institutions such as the Smithsonian Institution National Air and Space Museum, National Museum of the United States Air Force, and regional museums associated with Vintage Aircraft Association chapters. Restored R-985s are exhibited in airshows organized by groups like Experimental Aircraft Association and used in flyable restorations maintained by private collectors formerly associated with restoration firms linked to Farmingdale and Wichita overhaul facilities. Preservation efforts often coordinate technical data from archives maintained by Pratt & Whitney and historical records from NARA.
Category:Aircraft engines Category:Pratt & Whitney engines