Curtiss C-4 or D-4, In-line 4 Engine
date: label: Date
content: Circa 1907
name: label: Manufacturer
content: Curtiss Aeroplane and Motor Company
notes: label: Physical Description
content: Type: Reciprocating, in-line, 4 cylinders, C-4: air cooled, D-4: water cooled
label: Physical Description
content: Power: 18.6 kW (25 hp) at 1,800 rpm
label: Physical Description
content: Displacement: 2.7 L (165.12 cu in)
label: Physical Description
content: Bore and Stroke: 92.1 mm (3.625 in.) x 101.6 mm (4 in.)
label: Physical Description
content: Weight: 49.9 kg (110 lb)
label: Summary
content: 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.
label: Summary
content: 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.
place: label: Country of Origin
content: United States of America
setName: label: See more items in
content: National Air and Space Museum Collection
creditLine: label: Credit Line
content: Gift of Mrs. R. M. Kinderman
dataSource: label: Data Source
content: National Air and Space Museum
identifier: label: Inventory Number
content: A19700370000
objectType: label: Type
content: PROPULSION-Reciprocating & Rotary
objectRights: label: Restrictions & Rights
content: CC0
physicalDescription: label: Materials
content: Copper, Rubber, Steel, Ceramic, Aluminum, Paint, Preservative coating, Textile
label: Dimensions
content: Height: 45.7 cm (18 in.), Width: 17.8 cm (7 in.), Depth: 50.8 cm (20 in.)