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