When we apply rudder (say left rudder) to a plane with di/polyhedral, what happens?
The plane yaws; the right half of the wing then sees a greater angle of attack than the left half. (You can try this out if you don’t believe it: take a piece of paper and fold it slightly, like dihedral; then look at it end on, but slightly off-center, i.e. from the point of view of the approaching airflow.
