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Aerobatics(at)aol.com
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 Posted: Thu Mar 15, 2007 6:31 am Post subject: wingtip crack interesting |
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In a message dated 3/15/2007 9:18:37 A.M. Central Daylight Time, cnichols(at)scrtc.com writes:
| Quote: | Subject: wingtip crack
I have just noticed a 12 inch longitudinal hairline crack along the outside edge of the right wingtip on my Model IV 1200. I had originally thought it was just a scratch in the paint, but unfortunately that's not the case. I have no idea what could have caused this as the wingtip has never struck anything at least since I've owned the plane. My question is, can this be safely repaired, or should the wingtip be replaced. It appears to be perfectly sound otherwise, and because of the cracks location it wouldn't seem to me to be subject to a great deal of in-flight stress. I wonder about drilling a small hole at each end of the crack to keep it from extending any further, and then using an epoxy glue on the crack and epoxy filler on the drilled holes. Does this sound reasonable (ie safe)? Any opinions/recommendations appreciated.
Clem Nichols
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I dont respond much here but I have a few thoughts...
I assume if just a crack, its in the gel coat. While this will weaken the glass part a bit, it may not be ruined. If there is anyway of getting inside to the interior of the wing tip, you can clean and lay some glass from the inside to stiffen the cracked area... then just make the crack "look good" with touch up paint on the outside... maybe add a pinstripe?
If not, I might see if I could wick in some CA glue into the crack, when cured, try to make crack look good with touch up paint and see if it re develops... if it is really broken then I would lay glass on the outside and refinish.....
Just a modelers opinion!
In any case I hope it works out!
Dave Patrick
KF2
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pwmac(at)sisna.com
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| Posted: Thu Mar 15, 2007 7:02 am Post subject: wingtip crack interesting |
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At some point way back when, someone advised several of us builders that the wing tips needed to be reinforced based on previous experience. What we did it put a couple of fiberglass/epoxy lay ups on the inside where the two halfs are joined. It was pretty easy. Of course removal of the wing tip is required.
Paul
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At 07:30 AM 3/15/2007, you Clem Nichols wrote:
In a message dated 3/15/2007 9:18:37 A.M. Central Daylight Time, cnichols(at)scrtc.com writes:
Subject: wingtip crack
I have just noticed a 12 inch longitudinal hairline crack along the outside edge of the right wingtip on my Model IV 1200. I had originally thought it was just a scratch in the paint, but unfortunately that's not the case. I have no idea what could have caused this as the wingtip has never struck anything at least since I've owned the plane. My question is, can this be safely repaired, or should the wingtip be replaced. It appears to be perfectly sound otherwise, and because of the cracks location it wouldn't seem to me to be subject to a great deal of in-flight stress. I wonder about drilling a small hole at each end of the crack to keep it from extending any further, and then using an epoxy glue on the crack and epoxy filler on the drilled holes. Does this sound reasonable (ie safe)? Any opinions/recommendations appreciated.
Clem Nichols
I dont respond much here but I have a few thoughts...
I assume if just a crack, its in the gel coat. While this will weaken the glass part a bit, it may not be ruined. If there is anyway of getting inside to the interior of the wing tip, you can clean and lay some glass from the inside to stiffen the cracked area... then just make the crack "look good" with touch up paint on the outside... maybe add a pinstripe?
If not, I might see if I could wick in some CA glue into the crack, when cured, try to make crack look good with touch up paint and see if it re develops... if it is really broken then I would lay glass on the outside and refinish.....
Just a modelers opinion!
In any case I hope it works out!
Dave Patrick
KF2
_________________________________
SISNA...more service, less money.
http://www.sisna.com/exclusive/
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