ft JT and Keith later after some more use of grey matter and recall from experience. Thanks for the prompts JT. Give me a day to get back.
Fred with your comments we get right back to the rudder wagging the tail.
Consider straight and level balanced non asymmetric flight. Rudder is centre. Now apply a little rudder and the aicraft must yaw into a sideslip as a direct result of the sideforce you have just applied to the tail by the rudder/fin force. Any change to rudder angle under any circumstances changes the side force. Slight pause there to quickly go through all of the circumstances that come to mind.?? . That is the very reason we have a rudder is it not? You should not be considering the rudder/fin as a seperate entity to the tail as a whole.
I am most intrigued that you could consider it to be otherwise.
Can you put that down as a little win for JT's tally sheet or does it still leave you puzzled, confused and mybe unconvinced?