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Message
Rusty was asking the dimensions and durometer of the rubber dampers in
the drive. I think the question was aiming to change durometer in
order to change the resonant frequency on his one rotor installation. The
diameter of dampers is 1.374" and durometer is currently 50. I don't think
changing this will significantly change the fundamental (lowest order) resonance
that occurs at low speed (idle area). This is primarily affected by the
system lash. The dampers significantly affect only higher order harmonics
which can't often be felt but can be very destructive to the drive train.
Bottom line is I think it would be a wasted effort to change the rubber
dampers.
Thanks
for the info, and comments Tracy. It's a bit too soon to panic, because I
just haven't had enough chance to see where the vibrations really
occur. Unfortunately, it looks like it's going to be in the low to mid
2000 rpm range, which will be a problem. I hope to run
it some more tomorrow afternoon (or yesterday, depending on when this message
arrives).
Since
you say the system lash affects the fundamental resonance, would it be
reasonable to enlarge the bolt hole in the rubber dampener just a bit,
to allow a bit more lash at that point? That should be easy to do,
and I'm sure I could buy a few extra stock dampeners from you if it doesn't work
out.
Thanks,
Rusty
(010706/1247)
Off to
cabinet and shelving hell...
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