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Date: Mon, 16 Jan 2006 12:28:34 -0600
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: shake, rattle and hum
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Russell Duffy wrote:

>You had made mention of the prop being set at a high pitch angle, and that
>you were going to reduce the pitch thinking that was part of the prop
>oscillation problem.  Did you reset the pitch angle?  If you did then
>apparently that was not the problem. 
> 
>Hi Bob,
> 
>Yep, I changed the pitch from 15 degrees at the tip, to 10 degrees, and it
>made no difference.  
> 
>FWIW You might give some thought to adding mass to the engine.  This might
>be a situation where you could be adding weight to the wrong end of the
>vibration problem.  
> 
>Adding mass would be like adding a heavy flywheel, or the missing rotor, but
>I'm not sure I follow how it could be adding weight to the "wrong end of the
>vibration problem."   
> 
>I like the weather station,  for some reason I thought it would be warmer in
>Florida :>) 
> 
>Despite what many people believe, not all of Florida is in Miami.  It's a
>big state, and we hide the best part in the panhandle.  Shhhh, don't tell
>anyone  :-)    
> 
>21:56 1/15/06 
> 
>I see you're with Bellsouth too :-)
> 
>Cheers,
>Rusty 
>

I'm not even close to being qualified to have an opinion, but the talk 
of adding weight to the flywheel triggered memory of earlier talk of 
'rocking couple' on the 2 rotor engines, which if I read correctly, is 
the reason for the counterweights.

Is all of your counterweight on one end of the eshaft? If so, could the 
engine be rocking, causing the prop blades to not run true?

Go ahead; make me look stupid....

Charlie