Dogfight techniques : tutorial video

[CaptainDoggles]

Originally Posted by rga

In the turn itself, rudder is not needed.

You need the rudder to keep the longitudinal axis of the aircraft aligned with the arc of the turn, otherwise you'll skid. If your aircraft incorporates a significant amount of dihedral, there will be a net righting moment about the fuselage, meaning continued aileron input will be required to hold the turn. While it's true that things like Frise ailerons can counteract adverse yaw, there's also prop wash and P-factor to consider, both of which virtually guarantee that no conventional propeller aircraft can be "perfectly coordinated" in a turn without active use of a rudder.