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.

A-7
Hall-Scott A-7a at the National Air and Space Museum
Type Piston aero engine
National origin United States of America
Manufacturer Hall-Scott Motor Car Company
First run 1910s

Variants

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  • A-7: The A-7 used the same cylinders as the earlier 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 earlier Hall-Scott A-5a. 100 hp (75 kW) 5.25 in × 7 in (133 mm × 178 mm)[1]

Applications

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

Engines on display

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A Hall-Scott A-7a aircraft engine on display at the Hiller Aviation Museum

Specifications (A-7a)

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Hall-Scott A-7a at the Museum of Flight

Data from Airplane Engine Encyclopedia [1]

General characteristics

  • Type: Four-cylinder inline piston engine
  • Bore: 5.25 in (133.35 mm)
  • Stroke: 7 in (177.80 mm)
  • Displacement: 606.14 cu in (9.93 L)
  • Dry weight: 420 lb (190 kg)

Components

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

Performance

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

See also

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Related lists

References

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  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
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