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Kemp G-2 Horizontally-opposed Engine


Display Status:

This object is on display in the Early Flight exhibition at the National Air and Space Museum in Washington, DC.

Collection Item Summary:

The Kemp Machine Works of Muncie, Indiana, at one time built several types of air-cooled engines for airplanes, motorcycles, ice boats and air-drives for boats. This Kemp G-2 was one of these engines. It was suitable only for small single-seat airplanes such as Santos-Dumont's Demoiselle and a scaled-down version of Bleriot's Model XI.

Matthew B. Sellers, builder of the first Kentucky-manufactured aircraft, flew his first quadruplane from 1908 to 1913 powered by various 2-cylinder, horizontally-opposed engines such as this.

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

Credit Line

Gift of Matthew Bacon Sellers, Jr. and John Sellers.




  • 3-D: 84 × 39 × 39cm (33 1/16 × 15 3/8 × 15 3/8 in.)
  • Support: 33 × 27 × 15cm (13 in. × 10 5/8 in. × 5 7/8 in.)

Country of Origin

United States of America


Circa 1908

Physical Description

  • Type: Reciprocating, Horizontally-opposed, 2 cylinders, air cooled
  • Power rating: 12 kW (16 hp) at 1,300 rpm
  • Displacement: 2.08 L (127 cu in.)
  • Bore and Stroke: 11.43 cm (4.5 in.) x 11.43 cm (4.5 in.)
  • Weight: 27.7 kg (60.1 lb)


PROPULSION-Reciprocating & Rotary

Inventory Number