Algodoo

The teeth catch the drum at about 30 RPM, and the clutch will work up until about 100 RPM, then it starts to get glitchy. Start the sim, slowly increase the RPM, then decrease it. You`ll notice when it drops below 30 RPM the drum stops spinning. This can be used to maintain rotary motion without having to start and stop again, i.e. in an engine. I plan to incorporate this into a chainsaw.