Covering underchambered wings - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-22-2009, 10:01 PM   #1
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Cool Covering underchambered wings

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Looking for some fool proof ideas on covering a under chambered wing. This is a 120" span craft with a chord of 16 ".( Bellanca Skyrocket) I planned on using Ultra coat or 21 st Century fabric. Not sure if the Ultra coat, being plastic, will do the job. Would it be enough to use a couple coats of Balsa rite and rely on the adhesive of the covering to hold?
May even have to go to Solartex and stiching. I have been unable to find stitching proceedure for models.
Any input will be appreciated.
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Old 10-22-2009, 10:24 PM   #2
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Re: Covering underchambered wings

One coat of Balsarite film formula will do the trick just fine.

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Old 10-23-2009, 10:38 AM   #3
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Re: Covering underchambered wings

This can be done with or without an additional adhesive for the fabric or plastic. Those that have no adhesive of course will need some to make the medium adhere to the under camber. Best to test on a small portion of your wing before starting.

I have found only one way that consistently works for me. Start in the middle of the under camber and slowly work your way to the edges. Cap strips give the greatest area for adhesion and you must make sure the covering is firmly and completely attached to the ribs or cap strips before starting to seal any edges. Once I have sealed the ribs/cap strips of the open bays then I will start to seal to the leading edge and trailing edge sheeting in the same manner as before. Working from the center out. You do not need to stretch the medium taut you just need to keep the slack to a minimum. After the medium is attached to all the wood the only thing left to shrink are the open bays. Do not use a heat gun as this will soften the glue on the wood and it may detach ruining the under camber. Instead use an iron and carefully shrink the medium between the ribs until tight. Do not use any heat where ever the medium is attached to the wood as it may release. You may have to do this a few times to get all the small wrinkles out especially in corners but take your time and everything will work out.

If you do the bottom of the wing first it is easier to fix any mistakes I have even been told that once the bottom is done some have run a small bit of thin ca where the edges of the rib and fabric meet as extra insurance against detachment. I have not had to do this so I cannot speak from experience.

I know that once the covering has been shrunk and detaches on an under camber it is extremely difficult to get it back in place. I might give the ca a try in this case. In the past I found it easier in the long run to cut it out and reapply the patch in the same manner as the original application.

Hope this info is helpful

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Old 10-23-2009, 12:21 PM   #4
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Re: Covering underchambered wings

Dennis, Bill, thanks for the great advice. I had formed a basic "mental picture" of doing the job similar to what Dennis describes. However, it is always nice to have someone with first hand experience come forth. Good information!
The CA idea is a great idea. I had not thought of it and I think I will give it a try.
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