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Old 02-24-2005 | 01:15 PM
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Default Sealing hinge lines

Hi All,
I'm getting to the point of covering my GP Ultimate. I'm using CA hinges, but would like to seal the hinge lines. The problem is that I have no idea what the technique is to do this. Is it as simple as adding a strip of monocoat to cover the joint, leaving the trailing edge of the covering loose? Any help would be appreciated.
BTW, Minnflyer (I know you'll see this), I thought about copying your idea to reverse the color scheme, but have decided to attempt the box photo with the exception of adding color to the wingtips. I would enjoy seeing your version though.
Old 02-24-2005 | 02:22 PM
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Default RE: Sealing hinge lines

I think a piece of covering over the hinge line would work fine as long as you leave enough room for maximum deflection in both directions. However, I normally solve this problem by using "Iron on hinges" which will leave no gap.
Old 02-24-2005 | 04:15 PM
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Default RE: Sealing hinge lines

Leaving the TE loose won't work. Just fold a piece of covering and iron it into the bevel making sure that the covering (or tape) doesn't impead the movement of the control surface.

I don't have the Ultimate anymore And I don't have any pics, but here's a quick sketch of how it looked
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Old 02-24-2005 | 04:16 PM
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Default RE: Sealing hinge lines

What I do is deflect the hinge all the way over (disconnect the servo, so you get extra movement).

Then fold the covering in half, length wise.

Now, stick the covering down inside the hinge gap, and seal one side with the iron. If necessary, shove the covering as far in to the gap as possible, then seal the covering to the other side.

When the surface is deflected, the covering is "bent", it doesn't try to smooth over the "V" between the aileron and wing (for example). But it keeps air from going through.

I wouldn't leave the covering flapping in the breeze. Fuel will find it's way in there, and evetually the covering flap will fall off.
Old 02-26-2005 | 12:24 PM
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Default RE: Sealing hinge lines

Thanks to everybody for the advice, and a special thanks to MinnFlyer. After looking at your drawing, I've changed my mind and decided to go with the reverse scheme. Too bad you didn't have any photos. Hopefully I'll have a digital camara by the time I finish this project so I can post some.

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