ORIGINAL: aspectratio
steck79,
I have been thinking about this whole subject, and now I am beginning to wonder if there there might be a reason to believe that there should be a fast turning slipstream vortex, somewhere behind the airplane. Maybe the wind sock on your antenna is a clue is a clue to something after all.
Can you find anymore evidence that the air is rotating there?
aspectratio,
I understand your point... me too actually I'm thinking that, but I remember that little windsock... I will try the experiment when I'll try my friend airplane