12 c

 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


 Andrew, have you thought of selling those couplings? I think they
 would sell well on this list. Craig . Smith

 Found urethane to be unsuitable for my coushin drive,  Lasted about 5
  hours.  Ended up with vulcanised rubber, so far brilliant!( 35
 hours) . pictures of the urethane coupl;ings, As I said now done in
 rubber and the price went up as usual.
Neil Unger,



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