Wouter... Can you give us an indication of what the theoretical top speed ( or time around the race course) difference would be between a 1.9 m X 3.8 m cat VS a 2.14 X 4.3 meter cat?

Assuming the weight is the same (or within a few percent) and the rig style is the same with a proportionately larger sale for the 4.3m cat...and also would be nice to know with the exact same size rig.

There are a lot of variables that could color this scenario that I don’t want to muddy the water with. You have been suggesting an adult F-12, which makes perfect sense to me as well….others here are saying they would want to go up to a 14’ hull length for an adult “spur of the moment” cat. In general term, what kind of performance increase (percentage) would be gained by adding .5 meters in length?

I know there is a world of difference between Darrel’s A&O F-14 and the F-12 that has been under discussion for adult after work sailing …that’s given…what I am asking for….apples to apples how much is .5 meters going to help? I have a Styrofoam hull/plug shaped out right now at 4.3 m and just looking at it full size it doesn’t look like shorting it .5 meters would make much difference at all. What is your take on it from an engineering stand point? As numbers seldom, if ever lie.