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The Union Gas Engine Company (later the Union Diesel Engine Company) of Oakland, California designed this aircraft engine in 1915. In 1917, it was the first to pass the U.S. government 50-hour test. Union engines were built primarily for use in lighter-than-air craft, and an engine of this type powered the trans-Atlantic trial and record flight of the U.S. Navy’s Airship C-5 in 1919.

 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 1917 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Union Gas Engine Company, Oakland, California
 Physical Description Type: Reciprocating, In-line, 6 cylinders, water-cooled Power rating: 89.5 kW (120 hp) at 1,350 rpm Displacement: 11.3 L (691 cu. in.) Bore and Stroke: 121 mm (4.75 in) x 165 mm (6.5 in) Weight: 220 kg (485 lb) Dimensions Height 103.5 cm (40.75 in.), Width 43.2 cm (17 in.), Depth 165.1 cm (65 in.)
 Materials Steel, Aluminum, Paint, Preservative coating, Rubber, Textile
 Inventory Number A19270004000 Credit Line Transferred from the U.S. Navy Department, Washington, D.C. Data Source National Air and Space Museum Restrictions & Rights Open Access (CCO)
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