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Among the most successful early engines marketed in the United States were those designed and built by aviation pioneer and inventor Glenn Curtiss. Early Curtiss engines were designed to power motorcycles. The first Curtiss aircraft engines were air cooled but, to achieve higher power, Curtiss began to develop liquid-cooled engines.

With the advent of World War I, Curtiss concentrated its production on the famous 67 kW (90 hp) OX-5 engine which powered the JN-4D “Jenny” trainer aircraft. The OXX-6 engine was an improved version of the OX-5. Differences from the OX-5 included two magnetos (instead of one) for greater dependability and a slightly larger cylinder bore giving an additional 7.5 kW (10 horsepower). During World War I, the OXX-6 was used on such Curtiss aircraft as the Model N9 hydroplane. Together, the OX-5 and OXX-6 were the most extensively used American-built engines during World War I and in the following decade.

 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 1916 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Curtiss Aeroplane and Motor Company
 Physical Description Type: Reciprocating, 8 cylinders, V-type, water cooled Power rating: 75 kW (100 hp) at 1,400 rpm Displacement: 9.3 L (567 cu in.) Bore and Stroke: 108 mm (4.3 in.) x 127 mm (5 in.) Weight: 181.9 kg (401 lb) Dimensions Length: 144.1 cm (56.75 in.), Height: 93.3 cm (36.75 in.), Width: 75.6 cm (29.75 in.)
 Materials steel, Aluminum, copper, Rubber, Wood, Phenolic, Ceramic, brass, Textile
 Inventory Number A19710916000 Credit Line Transferred from the U.S. Navy Data Source National Air and Space Museum Restrictions & Rights Open Access (CCO)
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