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Dutheil-Chalmers Horizontally-opposed Engine


Display Status:

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

Dutheil-Chalmers Horizontally-opposed Engine

Collection Item Summary:

L. Dutheil and R. Chalmers and Company was an early French designer of aircraft engines in which the cylinders were all arranged horizontally. Two, three, four and six cylinder models were built. All were water cooled with the exception of the model represented by this artifact. This air-cooled engine was built by about 1910.

An engine similar to this type powered Santos-Dumont's Demoiselle aircraft.

Matthew B. Sellers, builder of the first Kentucky-manufactured aircraft, flew his first quadraplane from 1908 to 1913 powered by various 2-cylinder, horizontally-opposed engines. This Dutheil-Chalmers was one of these engines.

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.


  • Propeller - Wood
  • Engine Overall - Steel, Aluminum, Brass


Propeller Dimensions: Diameter 133 cm (52.250 in.), Chord 15 cm (6 in.), Shaft Hole Diameter 39 cm (1.8125 in.), Bolt hole diameter 0.6 cm (0.250 in.), Hub Diameter 10 cm (4.0 in.), Hub Thickness 6 cm (2.25 in.)

Country of Origin




Physical Description

  • Type: Reciprocating, Horizontally-opposed, 2 cylinders, air-cooled
  • Power: 15 kw (20 hp)
  • Displacement: Not available
  • Bore and Stroke: Not available
  • Weight: Not available


PROPULSION-Reciprocating & Rotary

Inventory Number