Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Bonjour Tommy,
This single-acting machine has an original distribution by three micro grooves dug in the crankshaft for both directions of rotation and reverse.
Very simple and effective in principle, it unfortunately does not work with steam at this scale (at scale 1, this machine really existed) because the grooves are too small and the steam inlet condenses before doing its job of thrust, which explains why I did not film the steam test which turned out to be completely unsuccessful