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clemwehner
Joined: 02 Feb 2009
Posts: 32
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 Posted: Tue Aug 06, 2013 9:23 pm Post subject: prop balancing |
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We're finally installing our GSC 68-inch wooden 3-bladed prop on a KF -IV-912. The instructions from GSC said the prop blades are balanced at the factory and are a matched and numbered set and the CG of the blades match. They say not to alter the blades in any way.
However when we put the blades on the static prop balancer (the wire stand one from Skystar), one blade is heavy. Weighing the blades reveals that one is indeed about 1 ounce heavier than the others. Since they are a numbered matched set, I question what to do next.
Do we try to add weight to the other two blades (varnish or something) to get them to static balance. But that would change the CG of the blades and "alter" them. What should we do?
Clem
Lawton OK
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Propellerjan
Joined: 11 Jan 2013
Posts: 21
Location: Sweden
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| Posted: Tue Aug 06, 2013 10:16 pm Post subject: prop balancing |
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Does it say they are dynamically balances?
one ounce is a lot of weight.
I suggest you Call GSC
"Varnish" is good for fine balance.
Jan
www.jcpropellerdesign.com
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mlpaton2000(at)yahoo.com
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| Posted: Wed Aug 07, 2013 1:28 pm Post subject: prop balancing |
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Hi, if you bought it from a reliable place take it back and explain the hassle. Dont run without balance !!
From: clemwehner <clemwehner(at)sbcglobal.net>
To: kitfox-list(at)matronics.com
Sent: Wednesday, August 7, 2013 7:23 AM
Subject: prop balancing
--> Kitfox-List message posted by: "clemwehner" <clemwehner(at)sbcglobal.net (clemwehner(at)sbcglobal.net)>
We're finally installing our GSC 68-inch wooden 3-bladed prop on a KF -IV-912. The instructions from GSC said the prop blades are balanced at the factory and are a matched and numbered set and the CG of the blades match. They say not to alter the blades in any way.
However when we put the blades on the static prop balancer (the wire stand one from Skystar), one blade is heavy. Weighing the blades reveals that one is indeed about 1 ounce heavier than the others. Since they are a numbered matched set, I question what to do next.
Do we try to add weight to the other two blades (varnish or something) to get them to static balance. But that would change the CG of the blades and "alter" them. What should we do?
Clem
Lawton OK
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=406117#406117
nbsp; -Matt Dralle, List A=========
[quote][b]
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dave
Joined: 22 Sep 2006
Posts: 1382
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| Posted: Fri Aug 09, 2013 6:19 am Post subject: prop balancing |
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Call Rick at GSC
The actual weights of each blade might not mean there is a issue.
static - should be close if you got an accurate static balancer.
Dave
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mikeperkins
Joined: 22 May 2007
Posts: 123
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| Posted: Fri Aug 09, 2013 8:11 am Post subject: Re: prop balancing |
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I've gotten my GSC prop balance to within the weight of a half-inch of masking tape applied at the tip using a prop balancer. The way I did this is that I bolted the prop hub between two plates, embedded bearings in the plates, and ran a shaft through the bearings. I'd also degreased the bearings to reduce friction so it would turn perfectly freely. Since I'd painted the back side of my prop flat black to prevent pilot-blinding when the sun is behind the aircraft, I was able to invisibly apply additional layers to the light blades.
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Mike Perkins
Havana, Illinois
Model I, 532, B gearbox, GSC prop |
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