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In 1899, the French-manufactured De Dion-Bouton engine powered a tri-cycle vehicle (three-wheel motorcycle) built by the same manufacturer. The higher speed, made possible by timed ignition, and air cooling of this type of engine made it more powerful for its size and weight than earlier automotive engines. Therefore, it was particularly useful for aviation applications, but originally too small for airplanes. However, the small engines were satisfactory for airships, and De Dion-Bouton engines powered Santos-Dumont’s No. 1 and No. 2 dirigibles.

In 1900, Dr. Samuel P. Langley, Secretary of the Smithsonian Institution, purchased this one-cylinder, air-cooled engine from the De Dion-Bouton firm in Paris. The artifact was taken apart, examined, and tested. Charles M. Manly, Langley's engineer, incorporated two features of the engine, namely the lightweight pistons and the ignition system, in his engine. Manly's design became the Langley-Manly-Balzer engine which powered Langley's 1903 Aerodrome.

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 1900 Country of Origin France Type PROPULSION-Reciprocating & Rotary Manufacturer De Dion-Bouton Motorette Company (Puteaux, France)
Physical Description Type: Reciprocating, 1 cylinder, air-cooled Power rating: 1.9 kW (2.5 hp) at 1,800 rpm Displacement: Not available Bore: 8.9 mm (3.5 in.) (approximate) Weight: Not available Dimensions Storage (Rehoused on an aluminum pallet with 3 additional objects): 121.9 × 121.9 × 76.2cm, 145.2kg (48 × 48 × 30 in., 320lb.)
Materials Steel, Paint, Preservative coating, Aluminum, Phenolic
Inventory Number A19390063000 Credit Line Deposit from Smithsonian Institution Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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