The PBY presents an interesting opportunity for elevator control. The elevator pivot line is in the rudder (not vert stabilizer). This limits how to control it. The plans offer no suggestion for operating the elevator. If you put the hinge line against the horizontal stab this would be easier. But I want scale movement of all the control surfaces.To accomplish this, the only way is to have the elevator control routed into the horizontal stab. Unfortunately this will have to go through the h-stab spar, which will have to be cut in half!
To support the elevator control, the spar will need to be modified with an opening 1/4" wide running top to bottom of the spar. Obviously this will destroy the spar's primary function. The only space to reinforce the spar is inside the v-stab. A plate of ply and carbon fiber in will be used to carry loads around the opening. The spar will be cut to allow the plate to be recessed into the spar and to fit in the original space. Here's a couple of picts. The CF is facing forward in the second picture.
