Hall-Scott A-7

The Hall-Scott A-7 was an early liquid-cooled aircraft engine manufactured by the Hall-Scott company of Berkeley, California. Using a straight-4 configuration, the engine developed 90 horsepower (67 kW) as the A-7 and 100 horsepower (75 kW) as the A-7a. In service these engines suffered from reliability problems and were prone to catch fire while in operation.

Variants

 * A-7: The A-7 used the same cylinders as the earlier Hall-Scott A-5. Bore: 5 in, stroke: 7 in, displacement: 549.78 cuin, weight: 410 lb, power: 90 hp at 1,400 rpm, weight: 410 lb
 * A-7a: The A-7a used the same cylinders as the earlier Hall-Scott A-5a. 100 hp 5.25 x

Applications

 * Aeromarine 39 (A-7a)
 * Aeromarine M-1 (A-7a)
 * Dayton-Wright FS (A-7a)
 * Standard J-1

In 2017 about seven A-7a engines were still in use in Edwardian racing cars, mostly in the United Kingdom.

Engines on display

 * A Hall-Scott A-7a is on public display at the Aerospace Museum of California.
 * A Hall-Scott A-7a is in ownership of the National Air and Space Museum.
 * A Hall-Scott A-7a is on public display at the Museum of Flight.
 * A Hall-Scott A-7a is on public display at the Hiller Aviation Museum.