Bates Model 2 B Horizontally-opposed Engine


Display Status:

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

Bates Model 2 B Horizontally-opposed Engine

Collection Item Summary:

This engine was manufactured by the Bates Engineering Company of Chicago, Illinois, about 1910. It is believed to be a 19 kW (25 shp) Model 2 B. The engine had automatic intake valves and mechanically actuated exhaust valves.

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 Bates Model 2 B was one of these engines.

Collection Item Long Description:



Inventory Number


Physical Description

  • Type: Reciprocating, Horizontally-opposed, 2 cylinders, air-cooled
  • Power: 19 kW (25 hp) at 1,200 rpm
  • Weight: 22 kg (49 lb)

Credit Line

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

Country of Origin

United States of America


  • Engine Case - Aluminum
  • Propeller Blade - Wood


Hub Depth: 5.2 cm (2.0625 in.), Shaft Hole Diameter: 4.4 cm (1.75 in.), Bolt Hole Diameter: 0.6 cm (0.25 in.), Hub Diameter: 11.7 cm (4.625 in.), Propeller Diameter: 56.1875 in. (142.7 cm)

Data Source

National Air and Space Museum

Restrictions & Rights

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


PROPULSION-Reciprocating & Rotary