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Pratt & Whitney initiated design and development of the R-2800 Double Wasp, America’s first 18-cylinder radial engine, in 1936. With water injection and turbo-supercharging, the R-2800 produced more than 46 kW/L (1-horsepower/cubic inch). Even though smaller, it was more powerful than the Gnome-Rhone 18L, the world’s only other modern eighteen cylinder engine, but required advanced cooling fins to dissipate the accompanying heat. During World War II, it powered the Grumman F6F Hellcat, Vought F4U Corsair, Republic P-47 Thunderbolt, and other combat aircraft. After the War, it powered the Douglas DC-6 and other airliners.

This R-2800-CB-16 was a commercial engine powered the Douglas DC-6A/-6B, Martin 202A, Martin 404, and Convair 340. By the time production ended in 1960, more than 125,000 R-2800s had been manufactured by Pratt & Whitney and its licensees, one of the largest production runs of any single aircraft engine model.

 Display Status This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date 1955 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Pratt & Whitney Physical Description Type: Reciprocating, 18 cylinders, radial, air cooled, two rows, gear-driven 1-stage, 2-speed supercharger Power rating: 1,790 kW (2,400 hp) at 2,800 rpm Displacement: 45.9 L (2,800 cu in.) Bore and Stroke: 146 mm (5.75 in.) x 152 mm (6 in.) Weight: 1,068 kg (2,350 lb) Dimensions Diameter 134.1 cm (52.8 in), Length 206.8 cm (81.4 in.)
 Materials Metal
 Inventory Number A19580058000 Credit Line Gift of United Aircraft Corporation, Pratt & Whitney Aircraft Division Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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