I've seen this design before. My hinges are a bit different though.

I make a series of hinges about 1" wide, applied side by side for the length of the control surface. That way, if one hinge did for some reason fail, all the other hinges would still be good. If the single hinge in the plans you posted lets go, then you'll lose your control surface.

I made up these sketches real quick. If they aren't clear, shoot me an email at [email protected] and I'll explain it a little better.


Mike