Originally Posted by
HarryC
I am surprised you have fallen for that! Dihedral as viewed from the rudder is the same dihedral regardless of whether it is at a +ve or -ve AoA. Whether the plane is upright, knife edge or inverted is irrelevant. From the point of view of the rudder and yaw, dihedral is the same whether at a +ve or -ve AoA. Those of us who have flown circuits with a 3 channel model can confirm it!
Happy to discuss further, and yes, after reading this article I see your point. A few other factors I'd like to mention but unfortunately tied up now with work for the next 24 hours.
You are right in describing the effect of rudder with anhedral, but my case was the use of rudder to compensate adverse yaw, and the adverse yaw from the down going aileron changes when you change from positive to negative G. (and becomes more pronounced if you have differential ailerons.
http://www.aeroexperiments.org/dianposneg.shtml