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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.

 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 1911 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Hendee Manufacturing Co. (Springfield, Massachusetts)
 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) Dimensions 3-D: 34.5 × 91.4cm (13 9/16 × 36 in.)
Support: 61 × 48.3 × 45.7cm (24 × 19 × 18 in.)
 Materials Metal
 Inventory Number A19240002000 Credit Line Gift of Earle Ovington Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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