: With a horizontal rudder the axle or pivot point would be underwater.
: Therefore it would need to be: (a) watertight; (b) faired into the hull
: somehow; and (c) the control arms that the steering cables attach to would
: need to be inside the hull which would reduce cargo space. It's been done
: by at least one other person on this board (the name escapes me) but I
: think that the complications outweigh the benefits for a lot of people.

: Bret

the main one i see is that if you have say a 4in deep by 12 long rudder out the back, when you go over a 2 inch wave, it levers mostly out of the water. (a little bit of exaggeration!)
-mick