Scooby_Simon, see your point of taking into account rig weight aloft as this would fall over the pivot point quicker in my taipan v viper example, but have we measured the extra force you able to exert through the lever effect v this force of the mast over the pivot. Would be interesting to see these calcs in the whole picture.
Do not understand the comment on pivot point; the pivot point for all forces IS the leeward hull; the only differece wings give you is to make the boat thinner and thus reduce the RM provided by the hull; the mast IS NOT the pivot point on a Cat; the leeward hull is. Remember the RM is there to overcome the lateral force created by the sail; this pivots at the leeward hull; you cannot use the standard "see-saw" diagrams to understand the forces as the heeling forces (sail forces) are at 90 degrees to the RM and so where EVER you put the mast; the heeling moment is the same and always resolves to the leeward hull.
