Originally posted by banktoturn
imagine that you have a plane with extreme dihedral, say 90 deg., and it finds itself rolled to the left, 90 deg., with no yaw angle, sideslip, or aileron deflection. What will happen?
Excellent ! I should have thought of that myself as example. Now, I am the first to admit that I forgot to mention, that, indeed, there is secondary forces, just like drag is a secondary force on lift, so that it seems certainly logical that a little more drag is generated by the wing gaining more lift, inducing a yaw effect, and the rotation of the plane around it's roll axis, when it recover, must have some secondary effect like sideslip or something like that. But, by definition, secondary effects are....secondary....
Bernard