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Old Jul 25, 2001, 06:45 PM
VNe
missing member
Chandler, AZ
Joined Apr 2001
71 Posts
Covered aileron hinges

I have just finished covering a 34" wing for a new project. I did not hinge the ailerons as I usually do with the covering material. I would rather not recover either part. Does anyone have suggestions on how I can securely attach the ailerons for a (hopefully) pretty fast s400 ship? The ailerons are almost full span and about 0.7" in chord. Is hinge tape an option or will it be strong enough?

Thanks in advance
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Old Jul 25, 2001, 08:28 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Three simple options..
- use a 1" srip of covering material attached over the already covered parts,
- use a 1" strip of clear packing tape - Memco (sp?) Crystal Clear is superb hinge material
- use a 1" mylar hinge tape (available from SR, etc.)

I'd use packing tape..
..a
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Old Jul 26, 2001, 06:02 PM
Registered User
Garland, Texas
Joined Jul 2000
339 Posts
Packing tape applied properly (clean surface no bubbles) is one of the finest hinge materials on the planet in my opinion

Lynn
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Old Jul 27, 2001, 10:40 PM
Dave Segal
Philadelphia PA USA
Joined Jun 2001
545 Posts
Another approach is to make rolling hinges from strips of covering material. These are practically frictionless and if done for the full length of the ailerons will seal the gap. And they will hold onto the ailerons more strongly than any other method. Hard to describe in words, but here goes.

The aileron is held by adjacent strips of covering material (matching that on the wing and aileron) which are placed close alongside each other from one end of the aileron to the other. A strip will start on the top of the wing, go down through the gap and then adhere to the underside of the aileron. The next strip starts on the bottom of the wing and goes up through the gap to the top of the aileron. And just keep going.

The trick is how to get the adhesive to switch sides as it goes from top to bottom. This requires each strip to be made up of two pieces of covering joined, adhesive to adhesive, where they touch. The width of the overlap is critical and should be worked out by sample tests. The overlap must be great enough so that no adhesive touches the LE of the aileron or the TE of the wing. This is critical- you do not want the strips glued to the hinge area so the strips can just bend gently or "roll" as the aileron moves. But if the overlap is too great they will tend to stick up from the wing surface. Easy to work out in a few minutes.

The good news is that the strips can be made in batches. (I will make up some dimensions for this example.) Cut two pieces of covering 1" x 10". Overlap them on the long edge by 1/4" with the adhesive sides face to face. Place on a glass sheet and use a trim iron along the overlap to join them. You now have something that is 10" long by 1.75" wide. This is the stock from which you will slice off 1/2" strips. The strips are your hinges and they are ready to install. Actually not hard to do as there are no critical steps like cutting hinge slots. Just spend a mindless evening with the radio on and your iron hot and it goes quickly. I hope this makes some sense to you.

BTW, this is originally intended to work with mating surfaces that are rounded to best give the rolling effect. But I have salvaged a plane which had a square wing TE and only a rounded aileron LE. It should work OK on the common V-bevelled aileron LE. But it is not the way to go if the aileron LE has a slant bevel.

Dave Segal
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Old Jul 28, 2001, 12:19 AM
VNe
missing member
Chandler, AZ
Joined Apr 2001
71 Posts
Thanks everyone for the replies... I think I will have to go with the packing tape.

Dsegal, I feel bad you wrote so much... thats how I usually do my hinges, but the wings and ailerons are already covered in a tiger stripe pattern. Alternating strips would drive me nuts trying to get the stripes lined up. Now to find that roll of tape........
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Old Aug 05, 2001, 06:27 AM
Registered User
Berkshire, UK
Joined May 2001
13 Posts
Clear packing tape sounds great for hingeing already-covered control surfaces. What's the correct method to apply?

Do you use 2 strips - one on the top surfaces and one on the bottom surfaces (like covering-film hinges) - or is one strip of tape on the top enough?

Thanks for any advice.
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Old Aug 05, 2001, 07:51 AM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Just one, in most cases..
..a
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Old Aug 05, 2001, 10:25 AM
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Gerald's Avatar
Joined May 2000
3,335 Posts
Quote:
Originally posted by VNe:
Thanks everyone for the replies... I think I will have to go with the packing tape.

Dsegal, I feel bad you wrote so much... thats how I usually do my hinges, but the wings and ailerons are already covered in a tiger stripe pattern. Alternating strips would drive me nuts trying to get the stripes lined up. Now to find that roll of tape........
You can still use your usual method then using the clear tape to produce the over-and-under hinges instead of covering material. Just stick two pieces of tape together in the same fashion. I have always been worried about using a single strip of normal covering or tape to make a hinge. If it starts tearing, the tear can go all the way along the hinge.

I think the best hinge tape is the stuff SR batteries sells. It VERY tough and WON'T come off but still pretty flexible. I haven't found any other source for the same stuff.
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