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The Wasp Major was Pratt & Whitney’s last big piston engine. Although four rows in the radial configuration seems a cooling problem, the Wasp Major was effectively cooled by staggering each of its rows of seven cylinders. It was reliable in flight, but required extensive and time consuming checks at startup and shutdown.

Beginning in 1941, the gigantic Convair B-36 strategic bomber was likely planned around this engine, which used six R-4360s along with four turbojets. The Wasp Major saw service at the end of World War II in late Boeing B-29s that were actually early B-50s, and was used on the Boeing B-50 "Lucky Lady" when it made the first non-stop around the world flight from Fort Worth, Texas, in 1949.

Other principal applications were in the Douglas C-124 Globemaster and the civilian Boeing Stratocruiser, which was derived from the B-50.

 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 Circa World War II Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Pratt & Whitney
 Physical Description Type: Reciprocating, 28 cylinders, 4-rows, radial, air cooled, supercharged Power rating: 2,237 kW (3,000 hp) at 2,700 rpm Displacement: 71.5 L (4,360 cu in.) Bore and Stroke: 146 mm (5.8 in.) x 152 mm (6.0 in.) Weight: 1,636 kg (3,600 lb) Dimensions Storage: 273 × 162.6 × 181.6cm, 1921kg (8 ft. 11 1/2 in. × 5 ft. 4 in. × 5 ft. 11 1/2 in., 4235lb.)
 Materials Steel, Aluminum, Paint, Ceramic, Rubber, Textile, Phenolic, Preservative Coating, Copper
 Inventory Number A19731549000 Credit Line Transferred from the U.S. Navy, Naval Supply Center, Cheatham Annex, Williamsburg, Virginia Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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