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From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [FlyRotary] Re: A First (and note to Perry)
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Date: Mon, 13 Dec 2004 22:41:35 -0500
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"Perry Mick" <pjmick@mail.viclink.com> wrote:

"""
I've tried 4 times now to use a computerized dynamic balance
  system, but it won't converge on a solution. It always worked perfectly with
  my direct-drive fan. So it mustn't like geared engines. I'm going to trial-
  and-error it by moving a fender washer (weight) from one prop bolt to the
  next and see if the vibration level readout increases or decreases, and try
  to find a minimum.
"""

I'm curious, Perry, if a fender washer might not be overkill...  last guy I 
saw had a prop dynamically balanced it took a short #6 screw to get the job 
done.  Given the size of prop bolts and their associated fender washer size, 
aren't you concerned that will be _too much_ mass?  I'd think that much weight 
fladdling around off-center out there at 2000+ rpm would make matters worse, 
not better.  Like I said, just curious (and concerned).

  <Marv>