In a message dated 1/21/2004 5:57:49 PM Central Standard Time, gregory_fuess@yahoo.com writes:

<< Hello Fellow Rotary Enthusiasts,

As a new member of this list, and to rotaries in general, have any of you
guys considered torsional vibrations with regards to the rotary, PSRU and
propeller combinations?

There is a lot of discussion about this on another site, and since I am
considering the rotary, thought I would go to the source.

Appreciate any feedback or direction to information.

Regards,

Greg Fuess  >>

This is not a factor when a PSRU is used with a damping system. It can be elastic plugs or a spring center section similar to the center of a street clutch disc. If you try to make one idle too slowly, you can hear the vibrations. There is no reversal component as in a flat four airplane engine. Just not a factor.

Lynn E. Hanover