So what we are saying is that it is simply a rough guess where we put the boards, is there anyway we could " float " the hulls and then by some method find the centre of Effort around which the hull turns, add in the sail CoE of then use that as the leading edge of the boards.

The reason I am asking this is because I always ( well almost ) sail single handed ie main & spin only. Now most production designs are built for 2 up so my guess is that the daggerboards are in the wrong place for a main only boat. Any clues anybody ?