I hang this below your posting Rolf, because I know you enjoying reading this stuff.

Thank to the effort by Gareth and his Michlet hull drag software we have gotten these drag plots.





We must take the laser 1 drag data with a grain of salt though as the michlet software can't do planing calcs. So at higher speeds the laser drag line should be noticeably lower.

Still, even it the laser plot is noticeably lower after say 3.5 m/s (7 knots) then it will likely still be above the drag line for the F12.

Even if the two lines would overlap thanks to the laser planing then the larger width of the F12 will allow it to develop more sail drive by virtue of more righting moment then the laser. In short it will cream the laser upwind in condition where the laser will start to plane. Downwind the laser will be fast as here is low aspect rif won't hold it back much and the planing will really help, but the F12 will stay close just the same. Around the course this means the F12 will be across the line much earlier.

Wouter