Walter Gemma

The Walter Gemma was a Czechoslovakian nine-cylinder, air-cooled, radial aero engine that was developed and manufactured in the early 1930s by Walter Aircraft Engines.

Walter Gemma on display at the Finnish Aviation Museum
Type Radial aero engine
National origin Czechoslovakia
Manufacturer Walter Aircraft Engines
First run c.1934


Engines on display

A preserved example of the Walter Gemma engine is on display at the following museum:


Data from Flight.[1][2]

General characteristics

  • Type: 9-cylinder radial piston engine
  • Bore: 105 mm (4.1 in)
  • Stroke: 120 mm (4.7 in)
  • Displacement: 9.35 l (571 cu in)


  • Valvetrain: One intake and one exhaust valve per cylinder
  • Fuel system: Zenith carburettor
  • Fuel type: Petrol
  • Cooling system: Air-cooled


  • Power output: 123 kW (165 hp)

See also

Comparable engines

Related lists


  1. Flight - 11 November 1937 Retrieved: 13 July 2012
  2. Flight - 22 November 1934 Retrieved: 13 July 2012
  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
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