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Curtiss Model K, In-line 4 Engine


Display Status:

This object is on display in the Boeing Aviation Hangar room at Steven F. Udvar-Hazy Center in Chantilly, VA.

Curtiss Model K, In-line 4 Engine

Collection Item Summary:

Curtiss Model K

Among the most successful early engines marketed in the United States were those designed and built by aviation pioneer and inventor Glenn Curtiss in his factory in Hammondsport, New York. Curtiss introduced the Model K in 1911. This engine was an enlarged and improved version of an earlier Curtiss in-line air- and water-cooled power plant. Each cylinder in the engine had a single push rod and rocker arm, which operated the inlet and exhaust valves.

The Model K powered the Curtiss Type D pusher airplane, the U.S. Army’s second aircraft after the 1909 Wright Military Flyer.

Type:reciprocating, 4 cylinders, in-line, water cooled

Power rating:30 kW (40 hp) at 1,500 rpm

Displacement:4.1 L (251 cu in)

Weight:79.5 kg (175 lb)

Manufacturer:Curtiss Airplane and Motor Co., Hammondsport, N.Y.


Collection Item Long Description:

Data Source

National Air and Space Museum


Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum


Glenn H. Curtiss

Credit Line

Found in the collection.


Length 50.8 cm (20.0 in.), Width 30.5 cm (12.0 in.), Height 77.5 cm (30.5 in.)

Country of Origin

United States of America



Physical Description

  • Type: Reciprocating, in-line, 4 cylinders, water cooled
  • Power rating: 30 kW (40 hp) at 1,500 rpm
  • Displacement: 4.1 L (251 cu in.)
  • Bore and Stroke: 102 mm (4 in.) x 127 mm (5 in.)
  • Weight: 79.5 kg (175 lb)


PROPULSION-Reciprocating & Rotary

Inventory Number