I agree with Jim totally, but there is another factor that affects water stearing. If your floats are too small for your plane, they will ride too deep in the water and you end up with 2 long objects stearing your plane straight ahead. With the proper amount of floatation the floats ride much higher in the water resulting in better stearage. You really should'nt rely solely on the rudders for stearage anyway. The skillful use of the throttle in turns will reduce the need for water rudders. In fact, I only have one plane with a water rudder and the rest I fly without one. You just have to remember to not let yourself into a position where you don't have enough room to make your turns, as they will be a bit wider..........Seaplane