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To:  lml@lancaironline.net
Date: Mon, 07 Nov 2011 08:16:28 -0500
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From: "Dan Schaefer" <dfs155@roadrunner.com>
Subject: Lycoming balance spec
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Gary.

To get a four cylinder Lyc (or any engine/propeller combination, for that 
matter) balanced and running as smooth as possible, the engine/prop must be 
dynamically balanced as a system, while running on the airplane. Many good 
FBO's have the equipment, usually a Chadwick balancer (or equivalent). It 
requires attaching a vibration sensor to your engine and a small strip of 
reflecting tape to one blade of your prop, then running your engine at 
several different RPM's while the tech eye-balls the prop thru the Chadwick 
optics to determine where, and how much, weight to add to your spinner 
back-plate rim.

If for any reason the prop is removed (such as to replace the alternator 
belt on a Lycoming) be sure it's re-installed in the exact orientation it 
was in during the balancing or it will likely need to be re-balanced. 
Re-balancing will also need to be done following a prop overhaul. It also 
probably would be needed after an engine O/H as well.

In my experience, at least with my local wrench, a Chadwick balance isn't 
expensive (~$100 or so) and it makes a world of difference in the vibration 
the airframe and equipment must absorb.

(No affiliation with Chadwick, just a satisfied customer).

Dan Schaefer
LNC2   N235SP 


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