Shawn, I appreciate that it might be possible to end up with a negative dihedral effect but the majority of helos display positive dihedral effect in sideslip which is just as well for safety's sake. BTW this thread is not about torque changes with roll rates but different roll rates in left and right turns on most helicopters.
Heedm, I agree but I would really like to know why it happens and why no-one can answer the question.