The first time I fired my engine with a prop on it, it ran for about 30
seconds before the prop started free wheeling.  I pulled apart the redrive
and found the damper plate was toast.  From the pictures you can see that
the part that broke seems way too light to carry 100 hp and I was no where
close to that.  I've made a solid replacement disc, just have to get it
welded, for a replacement.  Guess I'll rely on the belt for any dampening.

Randy

Thanks for the heads up and pictures Randy.
We have seen this happen with the spring type in a 2 rotor as well
although several have survived over the years as Ross used
them.

The 3rd from last picture is the 2 rotor broken spring type.

However the one rotor torque pulse is severe. It is like
a one cylinder two cycle or a two cylinder four cycle piston
engine. One huge torque pulse per revolution.

Paul Lamar