For general information, I figure I can't copy it to this forum, but Kitplanes Weekly has an article on the new Time to Climb Record using a Rotary Engine, it is interesting and informative, but not the build approach for the average builder- far too complex. They used the Bell (very large and Robust) Helicopter Planetery PSRU coupled with synthetic isolators, Photos provided in the Article. Longevity may not have been their goal, so unsure how the damper stand up over time, however looks very robust.
George
George