On 9 Jan 2025, at 3:31 pm, Steven W. Boese SBoese@uwyo.edu <flyrotary@lancaironline.net> wrote:

Steve,

I didn’t see the cracks prior to disassembly and doubt that they could have been seen on the counterweight side very well -if at all- when assembled.

I replaced the Flexplate with a steel flywheel about a year ago.  Since then, I replaced the four rubber dampers with machined aluminum discs giving a solid connection and then dynamically balanced the system.  This was done because maintaining a dynamic balance wasn’t possible with the dampers.  Only a few hours of flight have occurred in this configuration so far and there has been no indication of problems resulting from this change.

Steve Boese

On Jan 8, 2025, at 11:03 PM, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:

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Hi Steve

Is this recent then?

I’m not able to get to my aircraft at present to check my flex plate which has probably seen 50 hours of service.

Was it possible to see these cracks assembled?

I would appreciate your reflections on Tracys latter choice to remove the damper, and particularly when using a timber/glass prop such as an MT.

It would be great to have an update and current info from Tracy regarding his no damper hours if anyone can contact him.

Very helpful, thanks again Steve

Steve

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