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Gap Less Hinges - 1/10/2008 12:47:52 AM   
Vendata


 

Posts: 82
Joined: 8/30/2004
From: Christchurch, NEW ZEALAND
Status: offline 		Hi there,
could some please send me a webb site on how to do gap less hinging.
Thanks
       Post #: 1

RE: Gap Less Hinges - 1/10/2008 1:24:00 AM   
BUDMAN27



Posts: 1133
Joined: 3/28/2006
From: Galveston, TX, USA
Status: offline 		I seal them with clear monicote on my stock class Q-500 (Great planes Vipper and Predater 2)

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       Post #: 2

RE: Gap Less Hinges - 1/10/2008 1:35:45 AM   
firstplaceaviator



Posts: 590
Joined: 2/21/2004
From: Wadsworth, OH, USA
Status: offline 		Are you building a plane with a glassed wing and tail, or is it monokote?

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       Post #: 3

RE: Gap Less Hinges - 1/10/2008 1:52:43 AM   
PylonDave



Posts: 201
Joined: 5/8/2006
From: rancho cucamonga, CA, USA
Status: offline 		go to nmpra.org and look for the links at the bottom of the home page. Thier are 2 great articles on Skinned hinges. I think they are easier to do than regualar hinges if you are glassing the wing anyway. on a monokote wing use #600 scotch tape and make a "wiper" by putting two pieces of tape together. sticky side to sticky side. Leave half of the sticky side exposed on one the bottom and cut the sticky side off on the top. Some use clear office dividers and the tape to make the wiper. Kind of hard to explain in a post.I tried to take a picture of mine but you cant see the tape Maybe some one else has a picture.

(in reply to firstplaceaviator)
       Post #: 4

RE: Gap Less Hinges - 1/10/2008 6:03:07 AM   
js3



Posts: 1142
Joined: 1/30/2002
From: Arvada, CO, USA
Status: offline 		Check out this thread...

http://www.rcuniverse.com/forum/m_383340/anchors_383340/mpage_1/key_skinned%252Chinges%252Cminnesota%252Cstyle/anchor/tm.htm#383340

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RE: Gap Less Hinges - 1/10/2008 8:29:48 AM   
Vendata


 

Posts: 82
Joined: 8/30/2004
From: Christchurch, NEW ZEALAND
Status: offline 		Hi there guys thanks for all the imformation on the Gap Less Hinges.
Yes it it for a new racer, & I will be covering the model in Ultracaot,
I have gone to the thead that Dave Norman has kindly posted.
This guy makes it look so easy, anyway I will have ago at doing it.
I think this way you dont get any Flutter & it makes it easy to Paint or cover.
0nce I have got the hang of it I will Glass the Wing & V-Tail & Paint it.

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       Post #: 6

RE: Gap Less Hinges - 1/10/2008 1:57:51 PM   
Ed Smith


 

Posts: 2835
Joined: 12/29/2001
From: Brantford, ON, CANADA
Status: offline 		Fluter has very little to do with the type of hinges. The hinges, of course, have to be free enough to allow the surface to move freely. Flutter is usually the result of a soft, flexible control surface vibrating at the outboard tip.

The picture shows a cure for an aileron with a full gapless hinge. A piece of tape across the corner.

Ed S

Attachments
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(in reply to Vendata)
       Post #: 7

RE: Gap Less Hinges - 1/10/2008 10:38:51 PM   
Vendata


 

Posts: 82
Joined: 8/30/2004
From: Christchurch, NEW ZEALAND
Status: offline 		Thanks for that information Ed, Gee I have just learnt some new, that I can pass on.
To other pylon guys. Tell me whats the piont in going to all the trouble, in doing skinned hinges as to standard hinges like in your photo? is it just for looks! or what?
Tell me why do guys use the skinned hinned method for, when its a lot easyer to use the standard hinge way? Thanks.

(in reply to Ed Smith)
       Post #: 8

RE: Gap Less Hinges - 1/11/2008 12:50:15 AM   
djlyon



Posts: 1941
Joined: 12/10/2001
From: Castaic, CA, USA
Status: offline 		They are perceived to have less drag in the 428, 422, F3D and F5D classes. Enough to make a difference.

Denis

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       Post #: 9

RE: Gap Less Hinges - 1/11/2008 1:10:05 AM   
HighPlains


 

Posts: 2666
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: online 		Nothing like false perceptions. The air is turbulent by the time you reach the hinge line. Sealed conventional hinges are just as good. But if you are making a molded wing, they should be easier to make.

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RE: Gap Less Hinges - 1/11/2008 1:24:06 AM   
BernieV


 

Posts: 17
Joined: 3/28/2002
From: Racine, WI, USA
Status: offline 		Highplains,

Is that true of all control surfaces (e.g. V-tail)? If you have a skinned hinge on top is it unnecessary to cover the gap on the bottom to help reduce drag?

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RE: Gap Less Hinges - 1/11/2008 2:09:22 AM   
HighPlains


 

Posts: 2666
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: online 		On a solid surface, I doubt you would see any difference in drag.

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       Post #: 12

RE: Gap Less Hinges - 1/11/2008 3:17:06 AM   
djlyon



Posts: 1941
Joined: 12/10/2001
From: Castaic, CA, USA
Status: offline 		I agree with Highplanes that the perception may be false and flow separation probably occurs before the hinge line. 2 million bucks and a good wind tunnel and I will get the correct answer. Answers are free, good answers cost a little, correct answers cost a lot.

Denis

< Message edited by djlyon -- 1/11/2008 4:40:25 AM >

_____________________________

I never met an engine I didn't like.
Of the things I've lost I miss my mind the most.

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       Post #: 13

RE: Gap Less Hinges - 1/12/2008 1:57:41 AM   
PylonDave



Posts: 201
Joined: 5/8/2006
From: rancho cucamonga, CA, USA
Status: offline 		Then why is it so important to have a sharp trailing edge on the wing and stab???

(in reply to djlyon)
       Post #: 14

RE: Gap Less Hinges - 1/12/2008 7:04:59 AM   
djlyon



Posts: 1941
Joined: 12/10/2001
From: Castaic, CA, USA
Status: offline 		I doubt that it is. But again back to the tunnel. What is important is to make every effort to reduce drag. And skin hinges or sharp trailing edges may not reduce drag but they won't add drag, hopefully.

Denis

_____________________________

I never met an engine I didn't like.
Of the things I've lost I miss my mind the most.

(in reply to PylonDave)
       Post #: 15

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