RE: WATER RUDDER - EASY:
I have used the Ernst, and it is good. I actually found that leaving the rubber band OFF was better. THe rudder will fall into the water at slow speed, and ride up when you are starting your takeoff run. This worked better for me. When at speed and up on the floats, the air rudder was all that was needed. After slowing down from landing, the rudder dropped back down under water for taxi time.