That was kinda my point. My boat's hulls are canted outward. As you look at the bows, they tilt inward at the top. The daggerboards and rudders are in line with the plane of each hull such that the hull, the board, and the rudder of the leeward hull is nice and plumb when flying a hull...many a-cats are that way (and so is the Nacra 20). I was just pointing out that it's tricky to define all this stuff...including what the vertical plane of a hull is.