Ed,
Assuming (key word here) that Tracy's PSRU can be regarded as "tighter
tolerances", mightn't rubber bushings effectively "loosen" the tolerances and
get us INto more trouble than they get us OUT of?
Just wonderin' .... Jim S.

Ed Anderson wrote:

> Hi Greg,
>
>    Welcome to the list.
>
>  Torsional vibrations and resonance are a fairly complex topic.  ..  In
> generally tighter tolerances raises the resonant frequency of an assembly
> and looser tolerances lower it.  Tighter tolerances are generally more
> expensive than looser.  ...By the way, since the rotary does not have a
> negative torque region in its
> power curve this problem is minimal and can generally be handled by some
> simple dampeners such as rubber disks, etc.
>
> Ed Anderson

--
Jim Sower  aka  Destiny's Plaything ...
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T