The Walter Gemma was a Czechoslovak nine-cylinder, air-cooled, radial aero engine that was developed and manufactured in the early 1930s by Walter Aircraft Engines.
Applications Nuri Demirağ Nu D.36 Praga E-39
Engines on display A preserved example of the Walter Gemma engine is on display at the following museum: Finnish Aviation Museum
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Bibliography
Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989.