Hall-Scott A-7-A, In-line 4 Engine, Cutaway
date: label: Date
content: Circa World War I
name: label: Manufacturer
content: Hall-Scott Motor Car Company, San Francisco, California
notes: label: Physical Description
content: Type: Reciprocating, 4 cylinders, In-line, Water-cooled
label: Physical Description
content: Power rating: 74.6 kW (100 hp) at 1,400 rpm
label: Physical Description
content: Displacement: 9 L (550 cu in.)
label: Physical Description
content: Bore and Stroke: 127 mm (5 in.) x 178 mm (7 in.)
label: Physical Description
content: Weight: 190.5 kg (420 lb)
label: Summary
content: 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 shp) Model A-2 and the 60 kW (80 shp) Model A-3, both water-cooled V-8 engines.
label: Summary
content: 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.
place: label: Country of Origin
content: United States of America
setName: label: See more items in
content: National Air and Space Museum Collection
creditLine: label: Credit Line
content: Transferred from the U.S. Navy
dataSource: label: Data Source
content: National Air and Space Museum
identifier: label: Inventory Number
content: A19710906000
objectType: label: Type
content: PROPULSION-Reciprocating & Rotary
objectRights: label: Restrictions & Rights
content: CC0
physicalDescription: label: Materials
content: Steel, Aluminum, Paint, Copper, Brass, Preservative coating
label: Dimensions
content: Overall: 43 7/8 x 24 x 62 1/2in., 420lb. (111.4 x 61 x 158.8cm, 190.5kg)
label: Dimensions
content: Approximate (Weighed with stand): 274kg (604lb.)
label: Dimensions
content: Height 111.4 cm (43.9 in.), Width 61 cm (24 in.), Depth 158.8 cm (62.5 in.)