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Troy Maynor
Joined: 10 Jan 2006
Posts: 162
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 Posted: Sun Feb 05, 2006 5:30 pm Post subject: Classic Wing Repair Needed |
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Hi All,
I'm seeking advice about classic wings. Yesterday I was giving the wings a
once-over again before putting the remaining coats of smooth prime. I was
checking if anything else needed sanding. On the starboard wing, about 2
feet from the root and about 1 foot from the leading edge on the bottom of
the wing I noticed a small raised spot about 1 or 1 1/2" that was not there
before. I know, because I had already sanded it smooth and had two coats of
primer and had sanded a little of it back off, and was fairly satisfied that
all was complete. It appears for some reason that it has delaminated on this
one spot. I took my spline with some 120 gt and got it back level again
without getting into the glass. It still has some Super-fil on it. If you
mash on it, it gives slightly to the push in an area about 1 inch or so. My
question is; should I grind a big ole place out down to the foam, which
seems scary to me, and lay up a few plies of bid? Or should I inject (using
a big ole syringe I have) some pure epoxy through a small hole into the soft
spot? Or should I inject a little epoxy/micro slurry into the area and see
how it feels after it cures? There isn't anything in this area such as
controls tubes or wiring conduits or the like. I can't figure out how it
happened. The wings have been built for 10 years or so. I have kept them in
recent years in a vertical sling made of carpet connected to 2 x 4s, much
like the transporter. This is the only irregularity I have seen. Any
thoughts or advice you all can offer?
Troy Maynor
N120EU Monowheel Classic
Left to finish:
Paint,interior,engine install, some wiring.
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paul.mcallister
Joined: 09 Jan 2006
Posts: 177
Location: Waukesha, WI USA
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| Posted: Sun Feb 05, 2006 6:24 pm Post subject: Classic Wing Repair Needed |
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Troy,
I am not expert, having only build one aircraft, but it is was mine I would
remove the whole area and re glass. You can find spots that are a potential
for delaminating by bouncing a coin on its edge over any suspect areas, it
will sound hollow if it has de laminated. Now is the time to find all these
spots rather than after its painted.
Just my 2 cents worth.
Paul
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hurstkr(at)growzone.com.a
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| Posted: Mon Feb 06, 2006 4:45 am Post subject: Classic Wing Repair Needed |
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Troy,
I was hoping Nev Eyre would come to your rescue here so while we wait to
hear from him, thought I would sympathise with you.
I had an identical bulge about 1" dia on the bottom of one of my wings too.
Mine was caused when I laid up a couple of plies of bid simultaneously on
the reinforced section trapping a little air pocket which I didn't see at
the time of lay-up. What made it worse was that I heated my workshop after
the lay-up to speed up the cure only to learn from this mistake. I have
discovered that whenever there is a small air pocket and the temp gets
elevated before cure, the air in the pocket expands and makes the bubble a
hell of a lot bigger. Having said this, I cannot understand how yours would
have happened after curing.
So I hope it makes you feel somewhat happier to know that you are not alone.
I drilled two small holes (about 1/16" or could have been 1/32") opposite
each other on the outsides of the bubble. I then injected pure epoxy with a
syringe into one hole until it came out the other. Using a bit of peel ply
and plastic sheeting as a release agent, I then covered the bubble and
weighted it down while it cured. It is still visible but I don't have the
high spot any more.
I am not putting this method forward as an approved solution, it is simply
what I did. If you would prefer to do an approved fibreglass repair, I
would suggest you contact a glider repairer to find out how to do a proper
scarf and the lay-ups. There is a repair procedure for this which is
different from anything we have done in construction.
Personally, with a bubble that small, I don't think there would be anything
to gain by going to the trouble of doing the proper repair procedure but I
could be wrong, I was once !
Good luck.
Kingsley
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