Skin hinge HELP!!
11-16-2006 | 05:44 AM
#2
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RE: Skin hinge HELP!!
Skin hinges? Do you mean using the covering for the hinge itself? I know a couple pattern guys who do that and swear by it. In fact I'm using that technique on the patter pane that just came off the building board.
Never thought of doing it on a speed plane.
How I was told to do it is instead of making the front of the control surface "V" shaped you angle it ike this "\" from the to to the bottom. Then line it up with the trailing edge of the wing and fip it up onto the top of the wing and apply a 1" wide strip of covering down the hinge line.
Then you flip it down the whole way and apply a strip to the top and cove twing as usual....no gaps and one friend of mine has two years worth or flights on his 2 meter pattern plane and no signs of faiure. It does make a shieking sound when doing snap ros though due to the large gap between the trailing edge and the aileron at full defection.
Never thought of doing it on a speed plane.
How I was told to do it is instead of making the front of the control surface "V" shaped you angle it ike this "\" from the to to the bottom. Then line it up with the trailing edge of the wing and fip it up onto the top of the wing and apply a 1" wide strip of covering down the hinge line.
Then you flip it down the whole way and apply a strip to the top and cove twing as usual....no gaps and one friend of mine has two years worth or flights on his 2 meter pattern plane and no signs of faiure. It does make a shieking sound when doing snap ros though due to the large gap between the trailing edge and the aileron at full defection.
11-16-2006 | 09:05 AM
#4
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From: Cleveland,
OH
RE: Skin hinge HELP!!
A word of caution on the skin hinges.....
I use them on occation on the Q-500 planes (they are somewhat standard equipment on composite birds anyway)
The skin hinges are great - they are strong, they provide an uninterupted airfoil top surface and a completely sealed control surface interface, but they are not suitable for anything where you will require any significant control throw.
On the Q-500 ailerons (1.3" wide) a throw of 1/4" up or down at the TE is considered huge (landing only configuration). Same goes for the elevators (maybe 3/8 max throw mixing full up and full rudder on the V-tail). We are talking 10-15deg MAXIMUM throws here.
From my experience (perhaps due to my selection of materials and process, Ive used both light kevelar and fiberglass) flexing the skin-hinge much more than that range, on a repeated basis, will cause a crack to form.
Just something to keep in mind.
Bob
I use them on occation on the Q-500 planes (they are somewhat standard equipment on composite birds anyway)
The skin hinges are great - they are strong, they provide an uninterupted airfoil top surface and a completely sealed control surface interface, but they are not suitable for anything where you will require any significant control throw.
On the Q-500 ailerons (1.3" wide) a throw of 1/4" up or down at the TE is considered huge (landing only configuration). Same goes for the elevators (maybe 3/8 max throw mixing full up and full rudder on the V-tail). We are talking 10-15deg MAXIMUM throws here.
From my experience (perhaps due to my selection of materials and process, Ive used both light kevelar and fiberglass) flexing the skin-hinge much more than that range, on a repeated basis, will cause a crack to form.
Just something to keep in mind.
Bob
