Originally Posted by iter
The yaw is very impressive. I wonder if the effect has to do with lifting one of the pontoons but keeping the other one on the carpet. This creates significant differential in drag and could be more like turning a caterpillar tractor.
Good question. I hadn't questioned why it worked.
I made a temporary axle and wheels and taped it to the HydroSkimmer to eliminate the possibility of the effect you noted.
On wheels, it turned a bit better and at much lower throttle.
I think this arrangement; shallow inverted V tail, may provide good yaw control on the ground for an autogyro and also provide good roll control in the air.