I agree to a point, but that also depends on tha fact that the plane is propped corretly. If you run a 13x8 as an example on an OS 70 for the Funtana it will most definatly look as though you do not have enough rudder to make the plane yaw in a hover. Theres just not enough prop wash going by the rudder to make the plane respond while its not moving. The same goes for too big of a low pitched prop. You need the recomended RPMs as well as a wide Dia prop to create the wash and the 14x4W may not be getting your plane up to RPM's quick enough hence the apperance of a lagging rudder. I am not saying its not but changing a prop and trying it out there is definatly an eaiser way to go than redesigning a rudder or getting rid of a plane until you have exhausted all of your options. I would try the prop thing first. It may be to the point where a 4W is too much and you might need a straight 14x4 instead of the W. Granted the W wil give you a more powerful wash load as the 14x4 will just incrase the amount across your surfaces. When I was trying get my prop right I had to purchase 4 of them and see what worked best for me. Not that I wanted to but in the end I was glad I did.