8178,

As I suspected. Thanks for sharing that experiment.

I have played around with my electric Typhoon some more. It has a molded, rounded fuselage.

I run the motor up and down indoors. There is no doubt that with even just minimal throttle, the threads blow straight back, and with full throttle, same thing.

I have a large 3D prop on it. Sometimes, if I just give it a blip of throttle, just enough to get the prop to twist five or six times, then I can make a thread on the top center move from hanging on the left to hanging to the right. Not every time.

I am going to play with it some more, but at this point I am thinking that the slip stream twist is very quickly overwhelmed as rpm increases and the prop begins to "fly" and move large volumes of air aft. What ever twist there is, it is not enough to visibly deviate a thread on my Typhoon at minimum or maximum throttle. Maybe it is one degree or two, the threads flutter, but it is certainly nothing obvious.