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Using Covering For Hinges? - 8/15/2003 10:53:52 AM   
putt_13



Posts: 347
Joined: 9/16/2002
From: Chilton, WI, USA
Status: offline 		Hello,
I am confused as to how you use covering for hinges. I want to cover my Ace Cub, and I want it too look sleek.If I use thread hinges, you will see the thread. Therefore, how doy ou use covering as the hinge. It seem like you wouldnt be able to shrink it, or else it wouldnt have any hinge like properties. If I could get some pictures of your guys Ace Simple Series hinges, it would grealy help. Thanx -Patrick

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Using Covering For Hinges? - 8/15/2003 12:08:48 PM   
William Robison



Posts: 20269
Joined: 11/10/2002
From: Mary Esther, Florida, FL, USA
Status: offline 		Putt-Putt:

It is easiest and strongest if you "Top" hinge the surface. I'll talk you through that, then you may do as you wish.

We'll take an aileron as our subject.

Instead of the leading edge bevel going to the center of the leading edge, make the bevel entirely from the lower surface, bringing it to a sharp edge at the top. If you don't picture this, consider gluing the aileron to the trailing edge of the wing. When you have the proper shape on the front of he aileron, it would glue on and be deflected down about 40 degrees, with no gap on top.

Now cut a strip of covering the length of the aileron, and twice as wide as the thickness of the trailing edge of the wing. Now hold the aileron in the position where yu want it to be mounted, and by raising the trailing edge roll it onto the upper surface of the wing. The aileron should now be sitting on the wing, wrong side up, with its leading edge even with the trailing edge of the wing.

Holding the aileron in this position, iron your strip of covering to the trailing edge of the wing and the leading ege of the aileron.

Now roll the aileron back into place, and using a second srtip of covering similar to the first, iron it over the top of the pivot, holding the aileron tight against the wing as you atttach the top cover.

Wasn't that hard?

Many variations to this, the way I've just talked you through is to use after the wing and aileron are covered, the lower part of the hinge could be one piece with the bottom covering of both the wing and aileron, as could the upper part cover both. And you could get really fancy the way the racers do, and install a semi-rigid cuff to seal the lower gap making it more streamlined.

Advantages of the skin hinge include being sealed against air flow through with no additional effort, they are probably the lightest hinge you can use, and it's easy.

Disadvantages? Not as strong as CA hinges, and the covering will start to crack and have to be replaced. Also, using skin hinges of any sort requires the pivot be at the top or bottom surface for maximum strength. With a center pivot, which can be done, the aerodynamic forces pulling the aileron to the rear have an easier time pulling the covering loose - the force is a lifting rather than stretching force.

Yes, the high speed racing planes often use skin hinges, but they aren't made with covering film.

Should be enough to get you in the air.

Bill.

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Using Covering For Hinges? - 8/15/2003 10:52:59 PM   
putt_13



Posts: 347
Joined: 9/16/2002
From: Chilton, WI, USA
Status: offline 		I think I will just use figure 8 hinges. They amaze me at how the work. They are so simple, but work great. Sorta remind me of a Jacobs Ladder. Thanx for the info. The Ace Cub is nearing completion. I cant WAIT to get it flying. Hopefully the BigMig .061 with a 6x2 will have enough thrust, so that I can take off, and not hand launch. -Patrick

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Using Covering For Hinges? - 8/16/2003 3:36:23 AM   
cabanestrut2002



Posts: 1094
Joined: 11/27/2002
From: camborne, UNITED KINGDOM
Status: offline 		heres an illustration to williams explanation.
this is a great way of hinging.
can also be done the other way up, but for me i usually do it on the top for cleaner surface on top of the model.
no gap, no slack, easy peasy!

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Using Covering For Hinges? - 8/16/2003 4:21:40 AM   
William Robison



Posts: 20269
Joined: 11/10/2002
From: Mary Esther, Florida, FL, USA
Status: offline 		cabanestrut2002:

Thanks for the illustration. It's perfect.

Bill.

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Using Covering For Hinges? - 8/16/2003 1:40:10 PM   
Bipe Flyer



Posts: 4983
Joined: 11/6/2002
From: Mission, BC, CANADA
Status: offline 		Check out this thread.
http://www.rcuniverse.com/forum/tm.asp?m=791091

There is a description and picture I posted there. The Sopwith Pup aileron hinge shown has the top hinged technique that William described. It is probably the easiest and nicest looking for thick control surfaces like ailerons. For thin surfaces like slab elevators I prefer centre hinging.

Covering hinges are no more difficult than any other type and once you've done a few you'll probably find that they are easier than most..

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RE: Using Covering For Hinges? - 6/15/2004 2:44:12 PM   
photoniq



Posts: 463
Joined: 6/11/2003
From: London, UNITED KINGDOM
Status: offline 		I am going to use these covering hinges on my combat gremlin - do any of you have a view (positive OR negative) on this?

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RE: Using Covering For Hinges? - 6/15/2004 3:22:48 PM   
William Robison



Posts: 20269
Joined: 11/10/2002
From: Mary Esther, Florida, FL, USA
Status: offline 		PQ:

Covering hinges are strong enough for a 15 or 25 combat plane with two caveats: Don't use light weight film, and referring to Cabane's illustration above, leave a small gap between the control surface and the fixed part, use this gap to stick the upper and lower strips one to the other. Much more resistant to pulling apart that way. And of course, be sure the film is tightly sealed.

Bill.

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Real Airplanes have Two Engines
AMA 25139 - More than 40 years.

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RE: Using Covering For Hinges? - 6/15/2004 4:05:28 PM   
SST



Posts: 1151
Joined: 6/26/2002
From: Mt. Morris, MI, USA
Status: offline 		You can sew two strips of iron-on cloth covering like super cover rite together, glue sides facing each other, and have a gapless, almost frictionless hinge.

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RE: Using Covering For Hinges? - 6/15/2004 5:36:05 PM   
Lynn S



Posts: 1503
Joined: 1/31/2003
From: Bolivar, TN, USA
Status: offline 		Putt-
Have you covered the wing yet? If not ,it helps to add a balsa trailing edge to provide more lift which makes hand launching much easier.

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RE: Using Covering For Hinges? - 6/16/2004 4:00:17 AM   
Dsegal


 

Posts: 1791
Joined: 10/20/2002
From: Philadelphia, PA, USA
Status: offline 		See the thread at http://www.rcuniverse.com/forum/m_1169731/anchors_1169731/mpage_1/key_hinge/anchor/tm.htm#1169731

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RE: Using Covering For Hinges? - 6/17/2004 4:51:57 AM   
Lynn S



Posts: 1503
Joined: 1/31/2003
From: Bolivar, TN, USA
Status: offline 		I used some Black Baron film to make hinges on my Extra and the strips started coming off. I checked all the strips and they were just barely stuck. This material must soak up fuel or cleaner. I replaced it with small ca hinges cut down to about 1/4 inch wide. I'm glad I only used it on the elevator.

< Message edited by Lynn S -- 6/17/2004 12:24:30 AM >

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RE: Using Covering For Hinges? - 6/17/2004 10:19:12 PM   
kdheath



Posts: 1275
Joined: 11/9/2002
From: Rochester, MN, USA
Status: offline 		It's a bit more trouble, but when I do Monokote hinges, I hinge the surface first and then cover over them to lock them down.
quote:

ORIGINAL: Lynn S

I used some Black Baron film to make hinges on my Extra and the strips started coming off. I checked all the strips and they were just barely stuck. This material must soak up fuel or cleaner. I replaced it with small ca hinges cut down to about 1/4 inch wide. I'm glad I only used it on the elevator.

(in reply to Lynn S)
       Post #: 13

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