steck79,

Good point about 8179's experiment. The threads are very close to the surface and in the boundry layer.

I tried tying a thread to a pin. Then I stuck it into the foam on the turtle deck of my Typhoon, so it was raised above the surface 3/4 of an inch or so.

Again, the thread flutters a lot, but on average I have to say that it appeared to deviate to the right of center, maybe two or three degrees! When it was taped to the surface, I could not see that much deviation from centerline.

I tried same thing on top of the fin. It seemed to deviate even more there, maybe three or four degrees!

Very interesting! Anyone else want to stick pins in their planes? I would be curious to hear the results.