Is there a rule of thumb regarding the placement of a control horn, other than putting the pivot point over the hinge line? I'm currently building a 1/4 scale sport type low wing plane.
What exactly I'm referring to is; should I use one with an extremely long arm so as to have the mount as far away from the hinge line as possible, is closer better. Or is it that you just
use one that places the mount in a beefier part of the control surface and call it good?

Thanks,

Paul