Originally Posted by Air Tourer
As for a balanced turn without a rudder or fin even, I guess all you'd need is some nice variable drag on the inside wing.
That's one way to do it.
One can also maybe think where the center of lift goes when one wing produces more lift than the other, and why that might give a rotational moment about earth-z.
So now we have three suggested mechanisms by which an airplane can rotate about an earth-z axis "into" the turn, when it rolls: one from Imbracable, one from you, and one above. Two of them are applicable to rudderless aircraft.
Which factor has the most influence? I doubt one can tell without putting specific numbers for specific airplanes in there.
PBL