Norcu

I’d say limiting roll authority is the most important, I never had problems with large pitch authority as long as the same large surface didn’t input roll. Sometimes the tiny ailerons keep flapping, but because they are so small the plane keeps flying straight and only rolls with a somewhat sustained input on the surface.

I think the problem with the SAS shaking the plane apart is based in the dual use of large surfaces as both roll and pitch control. As soon as there is a little roll induced, those make overcorrections when having input in both axis (and there is nearly always some Pitch Input) that destabilise pitch and roll simultaneously, leading to the runaway of control. I’ve reduced this problem by a large margin in just splitting those in two distinct surfaces, the big elevators solely for the pitch, and on the wingtips a separate small wing with a small aileron for roll (cave: if that is too big/has too much authority, it will reintroduce the problem) (the roll on the rudder should be switched off too) tldr: Three separate surfaces for the three axis of control, roll as small as possible and on the wing tip.