: Hi Risto,
: I suspect that you are referring to an overstern type rudder.
: Modern surfskis have understern rudders. They are long thin
: boats that are not really designed for quick turning. The image
: below shows some typical configurations. These boats are
: suitable for fast flatwater paddling but their primary design
: function is for fast downwind paddling. The various rudder
: shapes all serve their purpose but I would not expect to see
: anything other than a surf rudder in open ocean conditions. an
: overstern rudder such as used on a sea kayak would be totally
: inadequate.
: the rudder I have for my project is classified as a universal
: rudder.
:
: [IMG]http://i124.photobucket.com/albums/p23/CraigMel/WeedlessRudder.jpg[/IMG]

: cheers

Also realistically if you are inexperienced enough to mishandle a rudder you probably won't keep the ski upright in the first place so it won't matter :)

A ski isn't a beginner's boat.

Bill H.