1...does the foil need to be at the very tip of the rudder?
2. ..could it be ( say 25% up) and still function? (..for example, with a 2 foot rudder, could one place the foil at
1 foot 6 inches,..or 6 inches from the bottom?)
Depends on what the reason is for the foil. If it is to create a negative wave. Then it needs to be high up on the rudder.. Im sure Bieker has a mathematical model as to exactly where..
If the foil is anti-pitchpoling then a long as it is in the water it will work. Remembering that the base of the rudder means you have only one drag creating interface. Higher up and up and you have two.
