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The Hall-Scott Motor Car Company, with general offices in San Francisco and factories at Berkeley, California, began specializing in the construction of airplane engines in 1911. The water-cooled 30 kW (40 hp) Type A-1 was the first aircraft engine produced by the company. This was followed the 45 kW (60 hp) Model A-2 and the 60 kW (80 hp) Model A-3, both water-cooled V-8 engines.

The Hall-Scott Model A-7-A primarily powered the World War I Standard Aero Corporation Standard J aircraft. The Standard J and its Hall-Scott A-7-A engine along with the Curtiss JN-4D with its OX-5 engine were the two primary trainer aircraft and engines built in the U.S. during World War I. Despite vibration common to four-cylinder engines at the time, the A-7-A was otherwise regarded by experts as a rugged and dependable motor. The A-7-A also powered other Standard, Aero Marine, and Dayton-Wright aircraft.

 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 1917 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Hall-Scott Motor Car Company, San Francisco, California
 Physical Description Type: Reciprocating, In-line, 4 cylinders, water-cooled Power rating: 74.6 kW (100 hp) at 1,400 rpm Displacement: 9.9 L (606 cu in.) Bore and Stroke: 133 mm (5.25 in.) x 178 mm (7 in.) Weight: 191 kg (420 lb) Dimensions Height 111.4 cm (43.88 in.), Width 61 cm (24 in.), Depth 158.8 cm (62.5 in.)
 Materials Aluminum, Steel, Copper, Textile, Paint, Rubber, Preservative coating, Brass, Phenolic
 Inventory Number A19270003000 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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