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Product Description
Famous German airplane engine from WWI. You will need 6 of these cylinders.
If you interested, I have designed whole engine for 1/4 scale.
From Wikipedia: The Mercedes D.III, or F1466 as it was known internally, was a six-cylinder, SOHC valvetrain liquid-cooled inlineaircraft engine built by Daimler and used on a wide variety of German aircraft during World War I