Walter Pollux

The Walter Pollux is a Czechoslovakian nine-cylinder, air-cooled, radial engine, built by Walter Aircraft Engines for powering light aircraft and that first ran in 1936. The engine produces 240 kW (320 hp) at 1,800 rpm.[1]

Walter Pollux IIR
Type Radial aero engine
National origin Czechoslovakia
Manufacturer Walter Aircraft Engines
First run 1936

The first known use was on the Fieseler F 2 Tiger in 1934.[2]


Pollux II
Direct drive engine
Pollux II-R
Geared engine, reduction ratio 0.666:1


Engines on display

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

Specifications (Pollux II)

Data from Flight[3], Jane's all the World's Aircraft 1931[4]

General characteristics

  • Type: 9-cylinder radial piston engine
  • Bore: 135 mm (5.3 in)
  • Stroke: 170 mm (6.7 in)
  • Length: 1,220 mm (48 in)
  • Diameter: 1,254 mm (49.4 in)
  • Dry weight: 323 kg (712 lb); Pollux IIR 341 kg (751 lb)-geared


  • Valvetrain: One intake and one exhaust valve per cylinder
  • Fuel system: One Zenith double 60DCJ carburettor
  • Fuel type: Benzine - Benzol 50:50
  • Oil system: dry sump pressure feed
  • Cooling system: Air-cooled
  • Reduction gear: Pollux IIR - 0.666:1


See also

Comparable engines

Related lists


  1. Gunston, Bill (1989). World encyclopaedia of aero engines (Fully rev. 2nd ed.). P. Stephens. p. 174. ISBN 1-85260-163-9.
  2. "unknown". Flug Revue. November 2000.
  3. "ENGINES at the PARIS SHOW" (pdf). Flight. XXX (1457): 578–579. 26 November 1936. Retrieved 26 December 2018.
  4. Grey, C.G., ed. (1931). Jane's all the World's Aircraft 1931. London: Sampson Low, Marston & company, ltd. pp. 29d–30d.
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