Hi Paul,


This is the cush drive I have built for my single rotor.

It is machined out of 6061T6 billet on an old lathe and cheep Chinese
mill. The diameter is approx 4.7 inches, the inserts are urethane rod at
1.25 inches in diameter. I am going to start with the green urethane
which is the lowest Shore hardness available here. the photo shows a
yellow grade which is slightly harder. The rod cuts well with a sharp
tungsten blade on a drop saw.

I have also had a new flywheel machined from billet 4140, as I was not
happy with the flex plate. The whole assembly has been dynamically balanced.

Andrew Campbell.


Yes. That looks like it is going to work. Good idea.
You should use silicone rubber. Good to 500 F.
There is a certain amount of energy going into those dampers.

Urethane is only good to about 200 F.

Paul Lamar

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