RE: Ziroli Skyraider Build
Next three pictures show the ailerons and the mounts for the control horns I am using. I use the Dubro large scale plastic control horns. I make an interior mounting base for the control horn that is tied into two ribs and glued to the bottom sheeting. Then I will glue the top of the control horn base plate to the insde of the aileron on the mounting plate. Then when the top sheeting goes on the ailerons, you can't see the top mounting plate. I have never had any problems with this style of mounting once I learned to glue the plate on really good. I did have one that popped off when I tried bolting the control horn to the aileron and had to cut the shetting apart to get the mounting plate lined back up.
The last picture shows the bottom of the aileron with a piece of plywood in the hole keep the balsa sheeting from crushing when tightening the bolts. I wanted to make internal pushrods on the elevators but choose to do the elevator control horns the same as the ailerons.
-Scott-