Originally Posted by
uncle8
I think that you are reading it incorrectly. There is no opposite rudder required. In normal level flight, if you bank the aircraft without touching the rudder it will bank, start turning and slip. To overcome the slip (and any adverse yaw) you apply rudder into the turn so that the ball is centred.
If it was slipping in the turn, the ball would be displaced away from the centre of the turn, not towards the centre of the turn surely - hence requiring rudder away from the turn, not into it...