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This is the mechanism which spins the prop in my caricature P51 by pulling the belly airscoop. It is derived from the 8232 chopper force which uses the same idea to spin the main and tail rotor.

 

This is about as small as I could get it, to spin the prop fast enough while having a minimal travel of the linear slider connected to the belly intake. The FW190 and Spitfire use a slightly modified version where the linear tooth rack is replaced by a gear with lever.

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Uploaded on July 2, 2023