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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 H. Curtiss in his factory in Hammondsport, New York. The earliest Curtiss designed engines powered his racing motorcycles. The first Curtiss aircraft engine, a 5.2 kW (7 hp) air cooled, V-twin, powered a small dirigible in 1904.

During 1917 and 1918, the Curtiss K-6 (Kirkham-6) was designed under the direction of Charles B. Kirkham, an associate of Curtiss for a number of years who became the company’s Chief Engineer. Following the K-12, a Curtiss competitor for the highly successful Hispano-Suiza engine, the K-6 was introduced as a six-cylinder vertical direct-drive engine using the same cylinder block and the same crankshaft dimensions. Closely following the design of the K-12, the K-6 used K-12 parts wherever possible. Three K-6 engines powered the 1919 tri-motor Curtiss Eagle II airliner.

 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 1918 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Curtiss Aeroplane and Motor Company
 Physical Description Type: Reciprocating, 6 cylinders, in-line, water-cooled Power rating: 112 kW (150 hp) at 1,700 rpm Displacement: 9.38 L (572.54 cu in) Bore and Stroke: 114 mm (4.5 in.) x 152 mm (6 in.) Weight: 189.1 kg (417 lb) Dimensions Height 119.4 cm (47 in.), Width 81.3 cm (32 in.), Depth 168.9 cm (66.5 in.)
 Materials Aluminum, Steel, Copper, Rubber, Preservative Coating, Paint, Nickel plating, Textile
 Inventory Number A19520105000 Credit Line Transferred from the Department of the Navy, Bureau of Aeronautics. Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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