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asarangan(at)gmail.com
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 Posted: Sun Jul 28, 2013 5:09 pm Post subject: Fixing misaligned spar bush |
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I just noticed that one of the port wing's spar bush seems slightly misaligned. This is the bush near the inboard tip. It is recessed a bit to much on one side, and protrudes a bit too far on the other side of the spar. It also looks like it might be a tilted. As a result, I am unable to slide the spar socket over it. I expect this will be a problem when rigging (which I haven't done yet). Is there a fix for this? I was hoping that I can use some heat to soften the area and reposition that bush. Does that sound like a safe thing to do?
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rparigoris
Joined: 24 Nov 2009
Posts: 804
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| Posted: Sun Jul 28, 2013 6:40 pm Post subject: Re: Fixing misaligned spar bush |
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Hi Andrew
First thing is you want to make sure that you can mate both wings together and pin them together with the spar pins. Distance and alignment are critical here.
Then you want to make the bushings on the cockpit module to match the spar pins.
Bay, you really want to make sure the spar bushings in the wing are stuck and will not change.
If you heated a pin the size of the spar bushings I'm pretty sure you could soften and perhaps realign. That said I would speak with Bud or Europa. If I had to do it without guidance, I may remove the suspect bushing, really scuff sand things good and Redux/flox in place.
Another thing I would look at is I have a set of glider wings. With the glider wings you are supposed to match the wings to your bushings in the cockpit module, so the wings are not drilled for the spar holes. You drill and install the spar bushings. The bushings I think are kinurled and look like they would take very well to Redux/Floxing in place. I don't know if the dimensions are the same as the short wing bushings and if they take better to bonding in p[lace, but worth investigating.
Especially on my port wing, I have taken a rubber mallet and beat my port spar pip pin into position, especially after rigging "too" many times in a day. Normally I use a deep socket that fits my port pip pin arm perfectly with a 3" extension and use that to lever in place. I usually use carnuba wax to wax the pins. Last time rigging I used a rubber mallet softly as my arm was pretty tired. If the bushing was marginal held in place and let go, that for sure would be a pain.
If you don't get an answer, I can take a picture with dimensions of the glider wing spar bushing if you like.
Ron Parigoris
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