As to the aileron, think of the relative wind on the wings.
With an aileron dropped (looking like a flap), there will be increased
drag.
Of course the other one goes up, but I don't think the resultant force is
equal on both wings.
Thus, yaw results.

Brian, are you stating that this yaw causes the turn?, actually this is
adverse yaw and resists the turn.

Come, lets step into my flying laboratory, the Grob 103, and we'll explore
that interesting concept called adverse yaw.

BT