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Hendee Indian Rotary 7 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:

This is one of two rotary type engines built by the Hendee Manufacturing Company of Springfield, Massachusetts, manufacturers of the Indian Motorcycle. Although George Hendee led the business, his fellow former bicycle racer Oscar Hedstrom was the principal engineer, and responsible for the company's brief entry into aviation. Several features of the French Gnome "Omega" engine were incorporated into its design, particularly the inlet valves which are similar to the Monosaupape Engine.

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 Earle Ovington




  • 3-D: 34.5 × 91.4cm (13 9/16 × 36 in.)
  • Support: 61 × 48.3 × 45.7cm (24 × 19 × 18 in.)

Country of Origin

United States of America



Physical Description

  • Type: Rotary, 7 cylinders, air-cooled
  • Power rating: 37.3 kW (50 hp) at 1,100 rpm
  • Displacement: 8.41 L (513 cu in.)
  • Bore and Stroke: 111 mm (4.375 in.) x 124 mm (4.875 in.)
  • Weight: 84 kg (185 lb)


PROPULSION-Reciprocating & Rotary

Inventory Number