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Old Jun 21, 2011, 07:54 PM
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Question

Has anyone ever used Monokote to "tape" a center wing joint?


I'm curious if anyone has ever used monokote(or similar) to "tape" a center wing joint instead of nylon or glass cloth and epoxy? I wonder how it would do, as the tensional strength seems like it would hold up in a wing joint fine...it's pretty hard to pull that stuff apart.

Mark
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Old Jun 21, 2011, 08:31 PM
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I don't think it would be a good idea on a plane that is designed with fiberglass in the middle, the monokote might not break with a quick tensile test between your hands, but fatigue could weaken it and eventually cause a problem I'd imagine.
Old Jun 21, 2011, 08:38 PM
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I have my doubts. The impact strength is not so great that a fair impact would cause it to split. Happens all the time if you bump a wing tip hard enough.

BM
Old Jun 21, 2011, 08:54 PM
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I don't know...you still have the panels glued together, and I wonder what it would take to shear the monokote covering....
Old Jun 21, 2011, 09:53 PM
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There are many designs that don't rely on the center being glassed. And I'd imagine that it is overkill on many models, but it's not worth the risk IMO. You can heavily overengineer most planes and suffer little penalty in weight (not saying that this is the purpose of your idea), seems silly to compromise it.

Regardless, I'm quite certain we can say that epoxy and fiberglass far surpasses the tensile strength of Monokote.
Old Jun 21, 2011, 10:55 PM
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It's also a messy PIA...one reason I was thinking of trying something different/easier...
Old Jun 22, 2011, 06:39 PM
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Take some 3m77 and mist a coat on the glass cloth. Apply the cloth to the wing. Hold the wing with the leading edge up and start applying thin CA and let it wick down the cloth. Dry in minutes and then I put some spackle over it and sand it smooth. Last step I do is use some Sig Stix-it over the spackle and then cover with the monokote. Dave.
Old Jun 22, 2011, 08:02 PM
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On the last Kingcobra, I misted hair spray through the cloth to stick it down and smooth it out, then put resin on. Worked great, but still messy method. Looking for something neat that doesn't need spackling and mud.....

Mark
Old Jun 22, 2011, 10:24 PM
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how about a carbon spar?
Old Jun 22, 2011, 11:10 PM
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I'm looking for quick, clean and easy Maybe I'll have to sheet another wing and try it out....anybody make a heat-activated mesh tape????
Old Jun 23, 2011, 07:40 AM
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"anybody make a heat-activated mesh tape???? "

Mark
Not heat activated, but I got a roll of adhesive backed 2" fibreglass mesh drywall tape from the local hardware store that I used for a home renovation.
It might work. Stick it down, coat with resin, spackle(or not), sand.

Hope this helps.
D.


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