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Hall-Scott A-7

From Wikipedia, the free encyclopedia

Hall-Scott A-7A.jpg
Hall-Scott A-7 at the Museum of Flight
Type Piston aero engine
Manufacturer Hall-Scott

The Hall-Scott A-7 was an early aircraft engine manufactured by the Hall-Scott company of Berkeley, California. Of straight-4 configuration, it developed 100 horsepower (75 kW). These engines suffered from reliability problems and were prone to catch fire while in operation.


  • A-7: The A-7 used the same cylinders as the Hall-Scott A-5. Bore: 5 in (127.00 mm), stroke: 7 in (177.80 mm), displacement: 549.78 cu in (9.01 l), weight: 410 lb (190 kg), power: 90 hp (67 kW) at 1,400 rpm, weight: 410 lb (190 kg)[1]
  • A-7a:The A-7a used the same cylinders as the Hall-Scott A-5a. 100 hp (75 kW) 5.25 in × 7 in (133 mm × 178 mm)[1]


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

Engines on display

Specifications (A-7a)

Data from Airplane Engine Encyclopedia[1]

General characteristics


  • Valvetrain: 1 intake and 1 exhaust valve per cylinder SOHC
  • Fuel system: Miller or Zenith carburetors
  • Cooling system: Water


  • Power output: 100 hp (75 kW) at 1,400 rpm

See also

Related lists


  1. ^ a b c Angle, Glenn D. (1921). Airplane Engine Encyclopedia. Dayton, Ohio: THE OTTERBEIN PRESS. pp. 232-233.
  • Gunston, Bill. (1986). World Encyclopaedia of Aero Engines. Patrick Stephens: Wellingborough. p. 73

External links

This page was last edited on 1 February 2020, at 14:29
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