George your damper design looks too complicated.

All you need are a 10 mm ID titanium spacer in the center of the rubber
bushing and a large washer to capture the rubber.
Don't scale my sketch! You will have to beef up the auto tx flex
plate where the 10 mm cantilevered titanium bolt is attached.

A short piece of 50 mm dia 4130  1.25 mm wall steel tube on the outside of

the bushing

welded to the 4130 output disk. Keep the over all diameter of the device
as low as possible as the centrifugal loads are high at high RPM.
Tracy had one blow up when the guy ran the engine with no prop and
it buzzed well over 9000 RPM. Good idea to use titanium hardware
as that will reduce the mass and the centrifugal force on the 10
mm cantilevered titanium bolts.

Paul Lamar

Paul,
Thanks - points taken, much simpler!
However I was going to use 1/2" aluminium plate, if I were to use 4130 what
thickness would I need.
George (down under)

1/2 inch plate for the flywheel?

0.125 or 4 mm 4130 would be plenty strong for the ouput disk. A lot depends on how it is
attached to the psru input shaft.

BTW put the nuts on the back side of the flywheel or auto tx flex plate
as that will further reduce the bending force on those bolts due to centrifugal
force.

Paul Lamar
 
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