Aspect,
I understand your point, I have not tried it into the wind! I'll borrow the TX of my friend and put it out of my car... let's hope to not bend the antenna!!!
If I think about it, I think that into free flow the windsock would stay straight, after all our big windsocks that show wind direction seems to not rotate into the wind - why would they do, from a physical point of view? The strange thing is that it seemed that there was a particular place that could force the rotation of the windsock; in other places, (I'm always speaking behind the prop flow) it seemed to stay straight... perhaps when it was exactly on the center of the flow...


8178, really nice experiment! Could it be that the wires are too close to the surface - in the boundary layer? If so, little movement could be explained thanks to fluid viscosity...


After all guys, have you ever tried to take your plane (let's say a 3D plane, with a large prop) with 0 right thrust in your hand in vertical position @ full throttle?
With mine, a FAIR intense yaw moment there will be, towards the left... in other words, my point is: the yaw moment due to spiraling slipstream is not so weak!