(why only with a 25 knot headwind?)
Nope, you misunderstand me...I mentioned 25kts headwind simply to reinforce the usefullness of this procedure...for gaining rearward movement over the ground to reposition for your aircraft. i.e. those conditions are a perfect time to use this kind of advanced auto.
Of course, it can be done at any windspeed!!
I too have used instrument covers to help students 'get a feel' for the aircraft in autos. First time was when I was teaching autos, and the student kept on coming in too slow...after a couple, I realised that the ASI was reading wrong (10kts high), and he was relying on this too much...so the next time I brought the cover!
cl12pv2s