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This engine, built by the Glenn H. Curtiss Manufacturing Company of Hammondsport, New York, about 1907 is believed to be a Model C-4 or D-4 engine. The Model C-4 was designed specifically as a power plant for a U.S. military dirigible. It was built as a light aeronautical engine and was fitted with mechanical valves and auxiliary ports. A propeller was connected directly to its drive shaft.

The Model D-4 was identical with the Model C-4 excepting that it was water cooled. The D-4 was designed as a lightweight engine recommended by Curtiss for marine applications where the added weight of about 34 kg (75 lb) for the water-cooling system was not objectionable. Both engine models were rated at 19 kW (25 shp). This motor, which has both air- (cylinder heads) and water-cooled (cylinder barrels), is believed to have powered a 1910 aircraft owned by Ralph M. Kinderman.

 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 1907 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Curtiss Aeroplane and Motor Company
 Physical Description Type: Reciprocating, in-line, 4 cylinders, C-4: air cooled, D-4: water cooled Power: 18.6 kW (25 hp) at 1,800 rpm Displacement: 2.7 L (165.12 cu in) Bore and Stroke: 92.1 mm (3.625 in.) x 101.6 mm (4 in.) Weight: 49.9 kg (110 lb) Dimensions Height: 45.7 cm (18 in.), Width: 17.8 cm (7 in.), Depth: 50.8 cm (20 in.)
 Materials Copper, Rubber, Steel, Ceramic, Aluminum, Paint, Preservative coating, Textile
 Inventory Number A19700370000 Credit Line Gift of Mrs. R. M. Kinderman Data Source National Air and Space Museum Restrictions & Rights Open Access (CCO)
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