Hi speed bear away on a normal cat can ventilate the leward rudder to a point that you can't steer any more... on foils with next to no rudder still in the water will this not be a serious issue ?
Jordi Heguilor I don't think that foiling would reduce this problem significantly. In my experience the most significant loading on a rudder comes from the sails when you have high aspect rigs like that, and would be very dependent on fore-aft pitch (pitching forward drives the boat downwind, vice versa for pitching aft as with a windsurfer), and the loading changes again when you throw up the kite, tending to pull the boat hard downwind. however I haven't driven a powered up cat so in cats it may be different, but my guess is that it requires even more discipline around sail settings to ensure the sails don't over rule the rudder when foiling.
