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Jun 21, 2011, 06:54 PM
Gravity sucks.
mrittinger's Avatar
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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Jun 21, 2011, 07:31 PM
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ChillPhatCat's Avatar
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.
Jun 21, 2011, 07:38 PM
Registered User
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
Jun 21, 2011, 07:54 PM
Gravity sucks.
mrittinger's Avatar
I don't know...you still have the panels glued together, and I wonder what it would take to shear the monokote covering....
Jun 21, 2011, 08:53 PM
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ChillPhatCat's Avatar
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.
Jun 21, 2011, 09:55 PM
Gravity sucks.
mrittinger's Avatar
It's also a messy PIA...one reason I was thinking of trying something different/easier...
Jun 22, 2011, 05:39 PM
Registered User
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.
Jun 22, 2011, 07:02 PM
Gravity sucks.
mrittinger's Avatar
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
Jun 22, 2011, 09:24 PM
Suspended Account
how about a carbon spar?
Jun 22, 2011, 10:10 PM
Gravity sucks.
mrittinger's Avatar
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????
Jun 23, 2011, 06:40 AM
Registered User
Dave Lindsey's Avatar
"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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