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Jack's AOU  Rate Topic 
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 Posted: Mon Jun 7th, 2021 12:26 pm
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David Kilnapp
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I'm working on a fan that my young friend, Jack, bought at Tom Zapf's fan fair. It's an early GE AOU. The blade was fairly difficult to remove (stuck on by years of rust) but we managed to get it off. Jack and I have preserved the original paint so that it looks pretty good. The head wires were shot so we replaced them with Tony Clayton's marvelous wire. The stator and speed coil work perfectly. Here it is running  with a replacement twelve inch blade that I had sitting around.

The blade was out of clock and unbalanced. I managed to get it back into clock but I'm clueless as to how to balance it. One blade is clearly heavier than the others.



How does one go about balancing a blade? I put it on the fan and turned it on and the thing nearly jumped off the bench it was shaking so badly. Kind of like a tire out of balance. Who among our members is able to balance this for our young friend Jack? Should I look for a replacement?



Last edited on Mon Jun 7th, 2021 12:27 pm by David Kilnapp

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 Posted: Mon Jun 7th, 2021 01:16 pm
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Patrick Ray
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I just went through the same scenario. I used a DuBro prop balancer to find the heavy wings. I had a really heavy wing to work with. So I busted out with a palm sander and 220 grit. After removing material from the back side of the offending blade, checking on the DuBro, sanding, checking, sanding, checking (check often as you don't want to end up too light and have to start messing with other wings), I ended up wet sanding the sanding marks out, then buffed the blade. Then check balance one more time. Not a hard task, just tedious work.

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 Posted: Mon Jun 7th, 2021 02:14 pm
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David Kilnapp
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Hi Patrick. I don't mind doing that but after some more investigation, I have figured out the issue. One of the blades was replaced at some point and riveted on the hub at an angle which is quite a bit different from the other three blades. My wife spotted the different shape of the blade (indicating that it was replaced) and I was able to correct that and balance the blade but that doesn't solve the main issue. The only way to fix that would be to drill out two of the three rivets and rotate the blade on the spider to the correct angle and re-rivet. This would solve the problem but leave some holes in the spider that would need filling - not a great solution.

Last edited on Mon Jun 7th, 2021 02:17 pm by David Kilnapp

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 Posted: Wed Jun 9th, 2021 06:35 pm
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Alex Rushing
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Hey David,
Seems the blade is what we call "out of clock" meaning they're not perfectly 12, 3, 6, and 9 o'clock.

The best method I've found is to hold three spider fingers and try to move the offending blade finger with the other hand. Welding gloves work well for this. If you're not wanting to straighten the blades, you can use the method Patrick mentioned. It is one I've had good luck with in the past when blades were planed and clocked, yet still out of balance for whatever reason.

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 Posted: Wed Jun 9th, 2021 10:24 pm
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David Kilnapp
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Thanks Alex. Patrick has graciously offered Jack a replacement blade at no cost (including shipping). Dennis LeBow is providing the clips and maybe a replacement for the rotor, also at no cost! I’m going to be paying this forward for some time I guess! Lovely generous folks in this club!!

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 Posted: Wed Jun 9th, 2021 11:50 pm
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Stan Adams
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One word of caution, I have run into a bunch of GE AOU fans that had a little shake & found the blade out of clock by a fair amount. Get it perfectly in clock thinking it will be great & the darn thing nearly flies off the table! John McComas told me & I have now seen it numerous times, GE knocked their blades out of clock to balance them. You almost have to use a static balancer. I knocked the lighter blades together & on the first hit, she was smooth as could be.

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 Posted: Wed Jun 9th, 2021 11:52 pm
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Lane Shirey
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Thanks Stan, I was just about to post that. Saved me some typing. Lol. 

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