ORIGINAL: Campy
The reason I am saying not to use the ailerons is that turning with the ailerons will cause the wings to bank. The banked wings are losing lift due to the angle. That drains the airspeed really quick. In addition, many people automatically add in up elevator to keep the nose up which causes further drag and loss of airspeed. By making the turn with just the rudder, you are minimizing airspeed loss since the main wing remains level still providing lift and the elevator is not raised to cause additional drag and possibly raise the nose.
When you have a "Dead Stick", you have suddenly become a glider pilot, and it is a VERY HEAVY GLIDER.
If you have a sim, try it out and you will see exactly what I am saying.
I DONT need to try it out in a sim, I know what happens and the forces involved, you go try it out in a real aeroplane.
You obviously didnt read what I wrote above completely.
Since when did using rudder NOT cause the wings to bank and NOT cause an increase in drag? Turning with rudder alone AND keeping wings level is an uncordinated out of ballance and high in drag way to turn. It requires opposite aileron to keep the wings level which adds more drag.
Maybe you need some glider time to understand.