All Tony wants is the business of you buying from him. A rudder in-line with the prop will turn just as well as a boat with dual rudders. All RC boats do not turn left a well as they turn right because of the way the prop is spinning. Dual rudders will also slow your boat down. Not by a whole lot, but they will. I have the WHH dual rudder system on one of my boats. And the only thing I could say it does better is keeping the boat going straight since I have hooks in my hull. You will not need dual rudders on a 38 mph WHH Super G.