I don't think you will have much chance of an appeal
Its basic engineering
Dihedral in static flight is a stability issue for dutch roll. It moves the CP in the vertical plane not the horizontal in relation to the wing root. And we need movement in the longitudinal to cause torsion.
Wing tip vortices are a function of drag and are external to the wing ie they are in the same plane as flight. So no moment so no torsion. (yes i know there will be a moment but not in the plane we are looking at it will be in the yaw axis but will be balanced)
Propwash as said before gives increased air flow over a portion of wing. But if the cp is is in the same plane as the wing root it will not give a torsional moment. Only an increased bending moment around the roll axis
A is the only answer
MJ
Last edited by mad_jock; 4th Mar 2003 at 23:45.