Walter Bora

The Walter Bora was a Czechoslovakian nine-cylinder, air-cooled radial engine for powering light aircraft that was developed in the 1930s by Walter Aircraft Engines.[1]

Walter Bora
Type Radial aero engine
National origin Czechoslovakia
Manufacturer Walter Aircraft Engines


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


Engines on display

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

Specifications (Bora II-R)

Data from Flight[2]

General characteristics

  • Type: 9-cylinder radial piston engine
  • Bore: 105 mm (4.1 in)
  • Stroke: 120 mm (4.7 in)
  • Dry weight: 172 kg (379 lb)


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


See also

Comparable engines

Related lists



  1. Gunston 1989, p. 174.
  2. Flight - Walter engines - November 1936 Retrieved: 19 October 2010


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