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Date: Mon, 12 Dec 2005 20:13:43 -0500
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From: Steve Reeves <sreeves@sc.rr.com>
Subject: Props and vibration
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	I can attest to the fact that wood is a much better absorber than 
metal!  I can't remember who asked me this, but they wanted to know 
how many wooden bells I had seen.  I switched from wood to a 
Sensenich metal prop a few months back and the vibration is driving 
me crazy.  The performance is outstanding (compared to what I was 
flying with before) but the vibrations I have picked up have me ready 
to throw it out and mortgage something in order to purchase a 
constant speed MT.  If I did that and the vibration remained I will 
probably go jump off of a bridge.  It idles very smoothly (hence the 
flywheel statement on the list) but I can't fly around at 700 to 1000 
RPM.  It also flies nicely at around 2100 to 2200 but who wants to do 
that?  I purchased new engine vibration isolators and have had the 
prop dynamically balanced.  It was already near perfect so that was a 
complete waste of 250 bucks plus a round trip to NC.  I needed new 
isolators anyway...my nose had started sagging.  I purchased the Lord 
mounts from Lancair (although I have a Glasair ;) ).  My engine is 
not plumbed for a hydraulic prop (O-320 E3D) so without going through 
a ton of trouble I assume the MT electric is my only choice.  I have 
heard great things about it, but my God these constant speed props 
are an arm and a leg... but what isn't on an airplane.  I had to take 
a BFR in a spam can a couple of weeks ago and it felt like a turbine 
to me.  Granted it was a 6cyl with 3 blade prop but 
still....  Anyway, if anyone has any thoughts I would be more than 
happy to hear them, otherwise I guess I need to start raising 
money.  The one thing that REALLY bothers me is if I fork out that 
kind of money and I still end up with the same problem.

End of rant.

Steve Reeves
Glasair 1FT 38SR