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There are many ways of constructing a hinge for the ailerons, rudder and elevator control surfaces.
Sealing the hinge line will stop high leaking from the high pressure region under the wing to the low pressure region above the wing. This will result in more lift for the wing and a more efficient aileron.
This type of hinge is used on most sports models with the servo operating the aileron inboard. The hinge is made using mylar or pin hinges. Make sure that gap is minimal. This has two benefits, it will result in less slack in the aileron hence maximising the movement and reduce the leakage between surfaces so increasing efficiency. Any gap can be sealed using a strip of covering material or a thin bead of silicon.
This really is how not to fit a hinge. On this model a slot has been cut in the surface of the rudder and the hinge glued in place. A piece of balsawood has then been glued over the top.
A second picture showing a hinge fitted incorrectly. In this case the balsawood cover has come off and hinge surface is exposed. Not sure how long this hinge would have remained fixed to the rudder!!!!
The second problem with this is the gap - a huge slot through which air will leak and so the effectiveness of the rudder will be lost to some extent.