Algodoo

A rotary collission engine, modeled after Killinich's rotary c-engine. It might not be as good, but it uses a scrited ratchet, so it is forced to either not spin, or spin the correct way.

This engine has a throttle that you can use by holding the Up Arrow Key. It makes the engine less stabile, but makes it more powerful and run faster.

For those of you that don't know, when you run this scene, the plot that's open is the crank shaft's angular velocity. The circle velocities menu in the corner is also the velocities of the crank shaft.

Not really completely tested, but I think this engine, at full throttle, gets spinning at a maximum speed of around 75 - 100 rad/s. At idle speed it's about 15 - 35 rad/s