Walter Castor

The Walter Castor was a Czechoslovakian seven-cylinder, air-cooled radial engine for powering aircraft that was developed in the late 1920s. The Super Castor was a nine-cylinder development.[1] Castor I has been produced since 1928, Castor II since 1932 and Castor III since 1934.

Walter Castor III
Type Radial aero engine
National origin Czechoslovakia
Manufacturer Walter Aircraft Engines
First run 1929


Engines on display

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

Specifications (Castor)

Data from Flight.,[2] L'Air 1 December 1929: Les Moteurs Walter[3]

General characteristics

  • Type: 7-cylinder radial piston engine
  • Bore: 135 mm (5.31 in)
  • Stroke: 170 mm (6.69 in)
  • Displacement: 17.033 l (1,039.4 cu in)
  • Dry weight: 248 kg (547 lb)


  • Valvetrain: One intake and one exhaust valve per cylinder
  • Fuel system: Zenith carburettor
  • Fuel type: 50% Petrol, 50% Benzol
  • Cooling system: Air-cooled


See also

Comparable engines

Related lists



  1. Gunston 1989, p. 174.
  2. Flight - The Walter Castor - 14 February 1929 Retrieved: 19 October 2010
  3. "Les Moteurs Walter". L'Air : revue mensuelle : organe de la Ligue nationale populaire de l'aviation (in French) (242): 35. 1 December 1929. Retrieved 14 February 2019.


  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
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