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Prop balancing

Old 07-15-2021, 05:27 AM
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David Gladwin
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Default Prop balancing

I am new to large radials and as a change from jets I have built an Airworld Sea Fury with a Moki 250 electric start, Core radio, finished ready to go after Fighter Aces ( UK) make a new spinner.

The prop is a. SEP 28x1, 4 blades.

Does anyone have any advice on checking the balance of this prop ?

Any help gratefully received.
Old 07-17-2021, 11:03 AM
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daveopam
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Never done a 4 blade the principle is the same. Once on a balance device the heavy blade goes to the bottom and you can start by adding weight opposite or sanding there. Just dont make the mistake like I've seen many do on a two blade. Many balance so it sits horizontal on the stand. This is wrong. If balanced it should stop anywhere.

David
Old 07-21-2021, 06:18 PM
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grbaker
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Instead of sanding a heavy blade, I like to shoot a little clear on the back side of the light blade.
Old 07-26-2021, 01:54 AM
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Originally Posted by daveopam View Post
Never done a 4 blade the principle is the same. Once on a balance device the heavy blade goes to the bottom and you can start by adding weight opposite or sanding there. Just dont make the mistake like I've seen many do on a two blade. Many balance so it sits horizontal on the stand. This is wrong. If balanced it should stop anywhere.

David
That's the tough part. I shave down the hub on the heavy side. Sometimes you can only go so far.

carl
Old 07-27-2021, 07:41 AM
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daveopam
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True. You can also drill a small hole in the hub and add a little weight.

David
Old 07-27-2021, 11:20 AM
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David Gladwin
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Thank you. Not sure I want to drill holes near hub!

I think a coat of clear on the light blade is probably best.
Old 07-27-2021, 11:36 AM
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I understand. I have a couple of Xoar props done that way from the factory. Not sure the material used for weight but it's green. About 1mm in diameter. Not sure how far it goes into the hub.

David

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