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Date: Wed, 14 Jul 2004 09:42:06 -0400
From: echristley@nc.rr.com
Subject: Re: [FlyRotary] Re: Prop Balancing
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Reply-to: echristley@nc.rr.com
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----- Original Message -----
From: Ed Anderson <eanderson@carolina.rr.com>
Date: Wednesday, July 14, 2004 7:21 am
Subject: [FlyRotary] Re: Prop Balancing

> Dave,
> 
>    The only place that I am personally aware of
weights being 
> placed is on
> the spinner back plate.  I presume that adding
weight to the 
> flywheel of a
> direct drive would also work (such as Lycomings)
but as you point 
> out not on
> PSRUs.
> 
>   Frequently nuts and washers are put on the back
of the nut 
> plates holding
> on the spinner or since my spinner was so close to
the cowl, the 
> drilledholes in the back plate and put in small bolts.
> 
> 
> Ed
> 
> Ed Anderson
> RV-6A N494BW Rotary Powered
> Matthews, NC
> ----- Original Message ----- 
> From: "DaveLeonard" <daveleonard@cox.net>
> To: "Rotary motors in aircraft"
<flyrotary@lancaironline.net>
> Sent: Tuesday, July 13, 2004 11:15 PM
> Subject: [FlyRotary] Prop Balancing
> 
> 
> >
> > I had a guy come see me about balancing my prop.
 He said the 
> standard> method involves attaching weights to the
flywheel.  
> Obviously that wont
> work
> > for us.  How have you guys balanced your props?
 Where do you put 
> the> weights?  Can I attach them to the spinner
plate?  Maybe the 
> prop bolts?
> >
> > Dave Leonard
> >

I read somewhere not to long ago about a $2 device
that has a small plate holding a flat spring
(hacksaw blade) with a small weight on the end (a
nut and bolt).  The plate sticks to the panel or
otherwise mounted solidly to the AC, and the spring
hangs straight down. With the engine running at
cruise RPM, the weight is slid up or down to
maximize its vibration, at which point it is in
sympathetic vibration with the rest of the airplane.

The prop is then balanced by spraying a little
matching paint or clear coat one of the prop tips. 
 Just a dab will do ya', was the articles message. 
Start the engine back up and if the vibration
increases, spray the other blade.

Sounds like one of those things that would be
tedious at first, but quick and easy once you have
the routine down.