Sender: "Marvin Kaye" <marv@lancaironline.net>
To: lml@lancaironline.net
Date: Thu, 31 Mar 2005 14:58:52 -0500
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From: Steve Reeves <sreeves@sc.rr.com>
Subject: Shake, rattle n roll
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	I have a prop question that hopefully someone can answer.  I switched from 
a wood prop (Culver) to a new Sensenich metal prop (fixed pitch).  I seem 
to have picked up some vibration at high power settings (it is most 
noticeable at climbout).  It also occurs in high cruise (2450 and up).  I 
thought I had a balancing issue and had the prop dynamically 
balanced.  They said it was already balanced (within 1 MIP?) but added a 
washer and got it perfect.  After 250 bucks and a wasted trip to NC I saw 
absolutely no difference.  I was wondering if I have a catch 22 situation 
here.  My static runup can only achieve around 2050 RPM.  There is no 
vibration around this area, and no way to run it up on the ground to see 
what is going on at the higher RPM's.  I would think that the dynamic 
balancer should catch anything down low (that's what they said).  I have an 
O-320, and I don't believe I have any spinner wobble, as my front bulkhead 
is pretty tight.  It isn't vibrating a lot, and maybe I am being anal and 
expecting too much out of a prop balancing session, but it definitely seems 
to be vibrating more than with my other propeller.  Any advice or 
suggestions would be greatly appreciated.  Thanks.

Steve Reeves
Glasair 343ND