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From: "george lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-863473@logan.com>
Subject: Re: [FlyRotary] Wrong flexplate, right counterweight
Date: Mon, 5 Dec 2005 16:50:53 +1000
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Bill,
I'm guessing
1. the timber is firmly attached to the flywheel/flexplate at the opposite
end of the
scales or the centre ( centre would be better).
2. That the timber itself  (with screws) was balanced e.g equi-distance each
side of the flywheel etc.
3. That the timber went through  the centre of the heaviest section of the
flywheel/flexplate (counter weight), which was closest to the scales.

Mind you I had to read it a couple of times, but it's a good idea when
changing form manual to auto flexplate to check for this.

I think I will rig something up to check for myself - thanks for the tip!!

George ( down under)

> I bought an RX-8 counterweight and at the same time I bought a '86 to '91
> flexplate. (I thought.) Apparently, I have an RX-8 flexplate instead.
>
> Thus, if anyone has a spare flexplate that will fit the RD-1C at a
> reasonable price, I'd appreciate it.
>
>  >>>> Simple way to measure the moment of the flywheel and counterweight
<<<
>
> Since the flexplate was wrong, and there are no numbers on any of the
> parts, I wanted to make sure I had the correct counterweight.
>
> I figured out a simple way to determine if I have the correct
> counterweight. I bought a lawnmower blade balancer at the corner hardware
> store. (It is a plastic cone on a spindle.) I put the manual flywheel from
> my RX-8 engine on the balancer. I put a laboratory scale next to the
> flywheel. I put a small spirit level on the flywheel center. Using a strip
> of wood with a pair of screws in it, (one just for balance) I leveled the
> flywheel by touching the scale with the tip of one of the screws. I
twisted
> the screw in and out until the flywheel was perfectly level. The scale
read
> 5.9 oz, and the screw was 8.5 inches from the center of the flywheel.
Thus,
> the counterweight built into the flywheel had a moment of 50 in-oz.
>
> I then set up the auto counter weight the same way. I got 5.76 oz. With
> the 8.5 inch distance to center, this worked out to 49 in-oz. Considering
> the crudeness of the measurement set-up, these numbers are the "same."
> Thus, I have the correct counterweight.
>
> It looks like they sent me a "matching" RX-8 counterweight and flexplate.
>
>
>
>
>
>
> Bill Dube <LED@Killacycle.com>
> http://www.killacycle.com/Lights.htm
>
>
>
> --
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