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Author Topic: ultracoat and flap hinges  (Read 821 times)

Offline Steven Kientz

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ultracoat and flap hinges
« on: February 14, 2011, 02:20:19 PM »
Getting close to where I have to make a decision about flap hinges on a Brodak Sea Hurricane. The kit includes cloth hinges, which I'd like to use. The problem is I'm going to use Ultracoat for the flying surfaces. Is there a way to do this? I've come to the conclusion that I need to cover the surfaces and then use CA or plastic hinges.
I could also omit the flaps for a fixed TE. If I do that does the elevator area need to be enlarged?
Any suggestions?

Steve
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Steve Kientz
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Offline Leester

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Re: ultracoat and flap hinges
« Reply #1 on: February 14, 2011, 03:52:41 PM »
If it were me I'd use the plastic hinges on the flaps and save the cloth hinges for another time. My Sea Hurricane is one of my 2 best flying planes and I'm sure without the flaps it wouldn't be.
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Offline Steven Kientz

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Re: ultracoat and flap hinges
« Reply #2 on: February 14, 2011, 05:19:41 PM »
Going flapless was a last resort. After posting another question came to mind. Is it easier to slot the TE before rounding and covering, or should I wait and slot it afterwards?

thanks
Steve
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Offline Leester

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Re: ultracoat and flap hinges
« Reply #3 on: February 14, 2011, 07:16:23 PM »
I always cut hinge slots in the trailing edge of the wing before I cover it, I don't round the trailing edge of the wing. I taper the flap (if called for) then V the leading edge of the flap then sand in the hinge pocket then slot it for the hinge and round the trailing edge of the flap. Make flap horn cut outs, After this is finished I cover it.
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Offline Steven Kientz

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Re: ultracoat and flap hinges
« Reply #4 on: February 15, 2011, 02:24:05 PM »
Sounds like a good plan to me.

Thanks
Steve
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Offline Terry Bernard

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Re: ultracoat and flap hinges
« Reply #5 on: February 16, 2011, 08:21:12 AM »
There is no reason whatsoever that you could not use Ultracote hinges. Just cut two strips about 1.5" wide and a foot long flip one over on the other (so the adhesive sides face opposite directions) overlapping about .5". Use the iron to seam them together. Cut the strips aout 1" wide and use just as you would a cloth hinge. Very free moving.

Terry
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Offline dennis lipsett

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Re: ultracoat and flap hinges
« Reply #6 on: March 09, 2011, 02:51:28 PM »
Quote from: Terry Bernard on February 16, 2011, 08:21:12 AM
There is no reason whatsoever that you could not use Ultracote hinges. Just cut two strips about 1.5" wide and a foot long flip one over on the other (so the adhesive sides face opposite directions) overlapping about .5". Use the iron to seam them together. Cut the strips aout 1" wide and use just as you would a cloth hinge. Very free moving.

Terry

While you can do that there is also another step to complete the job. basically you run a strip of material the length of the hinges and it spans both sides. Deflect the hinge to it's fullest deflection and iron it fast to the surfaces. You do this on both sides. It's purpose is to permenantly fix those hinges to the surfaces and as a benefit you now have no gap between surfaces.
I have seen hinges put on in the origional description start to peel off in very short order simply from fuel and cleaning fluid doing their job on them.
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