Thanks guys. I am not really concerned about pitch trim change when flaps are used. I know that affect is coming. Depending on wing position (height) pitch trim can do a number of different things. I look forward to flight experiments around what the flaps are going to do.

My question was regarding the wing altering or disturbing the flow of air over the stabilizer. In my view, it should be relatively straight, but with a bit of down flow in regular flight configuration. With flaps deployed, the air with likely be more turbulent, making the pitch control erratic if the stab is in the wrong position. Our guess is the best position is high on the fuselage, which will be a bit above the wing.

Bedford