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About the middle of 1923, the U.S. Navy signed a contract with Wright Aeronautical for three large air-cooled engine designs, which were to be built successively. The first of these, based on a design proposed earlier to the U.S. Army by Charles Lawrance, was known as the P-1, and was the direct forerunner of the highly successful Wright Cyclone series of engines. In order to reduce aerodynamic drag, its design was limited to a frontal area no greater than that of the Navy's Lawrance J engine, despite the fact that the P-1 had twice the displacement.

The P-1 was tested extensively in 1924 in a Douglas DT-2 aircraft, and flown successfully in the Navy Douglas DT-6 and Boeing aircraft. However, magnesium alloy castings, being used for the first time, failed in endurance tests. The P-1 was then discontinued in favor of the larger P-2, which added Heron-type cylinders and a supercharger.

 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 1925 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Wright Aeronautical
 Physical Description Type: Reciprocating, 9 cylinders, radial, air cooled Power rating: 303 kW (406 hp) at 1,650 rpm Displacement: 27.1 L (1,654 cu in.) Bore and Stroke: 152 mm (6.0 in.) x 165 mm (6.5 in.) Weight (dry): 368 kg (812 lb) Dimensions Diameter 121.9 cm (48 in.), Length 116.8 cm (46 in.)
 Materials Steel, Aluminum, Brass, Copper, Cadmium plating, Paint, Preservative coating, Magnesium, Rubber
 Inventory Number A19710881000 Credit Line Transferred from the U.S. Navy Data Source National Air and Space Museum Restrictions & Rights Open Access (CCO)
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