[quote=mini]Aido,
Back to the center boards. If you twist the boards in the case that would give you even more lift with straight canted ones wouldn't it?
17 kgs is crap need about 260 kgs at least.
with straight (canted) boards the vertical lift will always be directly proportional to lateral lift. The total lateral lift (across all boards, hulls and rudders approximately equals (total righting moment) / (0.45 x Mast height). On a modern cat approx 70% of this lift can be attributed to the leeward daggerboard. Then it comes down to basic trigonometry and vertical lift = lateral lift x tan(angle of board + angle of heel).
260kg is more vertical lift than the required lateral lift so a straight board would have to be canted more than 45 degrees.
