ORIGINAL: nexxa
I think a full flying stab is more effective, but how much...??? And there is an airfoil in it. Maybe it will modify the CG. But for the moment, I stick with the recommend one (4.5 inch).
I was once told by a fellow - well-known in modelling circles and regarded as being reasonably savvy about aerodynamics - that an elevator hinged at the 50% chord line produces more control authority per degree of travel than a full flying stab, due to the camber produced at any angle of excursion. Seems logical to me. We were talking subsonic, as in models at the time.
CG change required with full flying stab? I can't think of a reason why, when it's busy "stabilizin'" the center of lift is in the same place. I have, however, no idea one way or the other if there is a CL location shift with increasing control deflection, and if it differs in magnitude between the two configurations.
MJD