"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>