RE: Physics of the Funnel?
The tether works and now it makes sense.
I taped a string to an empty toilet paper tube (first thing I found) and pulled it tight in a nose up position. If I keep the point where I taped the string always facing me and move the heli to the left the string will wrap around the tube. I have to rotate it to the right to unwrap the string... so right stick is actually making the heli roll to the right. If I understand your exlanation the movement to the left movement is caused by a combination of control inputs replacing the string?