Algodoo

I like that gears, but mind that a rotary engine has to bear with a lot of strenght, so polygons won't work for this. For wankels (and I guess it works for this engine type too) you can take two gears like those of the scene but made of circles and scale down the inner one a bit

For realism the external circle gear needs to be attached to the rotor.
looks great otherwise

THANK YOU YOUR THE BEST! Now its time to make this a running engine

@Gent This is not a Wankel. Its a rotary engine with a more regular rotor shape and a totally different gear system.

The shape of this rotor is called the Rouleaux Triangle. Basically it is an equilateral triangle with circular sides.

Gent was in the USAF, he surely knows what a Reuleaux triangle is xD

The Linkage,

So circles are stronger than polygons. Make, or point me to, a scene that shows this.

Thanks Linkage
I agree but don't know how to demonstrate that circles and boxes
have better collision properties?
It has just been my experience attempting to make high speed engines
that polygons are not as well constrained and seem to create more lag
You are one of the REAL guru's here Steve, why don't you make a scientific
test for all our benefit?

I didn't realize this until after I made the Circle vs. Polygon scene, but I made a Polygon Box Circle Gears scene that allows you to test the strength of the different gears. Test results indicate that the polygons are stronger than the reduced radius circle gears in this case.

Scaled circle gears are also noisy in terms of input vs. output. Since circles have more curvature than the angle the teeth collide at, they jerk at each tooth and make a rough output. The polygons are more accurately shaped compared to the motion of the teeth.