Wouter,
I have never mentioned the CFR20 or M20 before on this or any forum before. One thing I am trying to point out is that boat performance can be calculated long before the boat is ever built. That's what engineers do. You seem pretty keen on these ratios now. This is the first time I have heard you mention them. The approach that I take to design a faster boat, higher sail area to weight ratio and higher righting moment to sail area ratio, does work for higher performance boats and it is the 'low cost way' to get there. This super light weight boat with all carbon parts approach is another way to get there but it is the high cost road. For example: Let's imagine a 20ft boat built in an autoclave that is made out of materials far superior to the Tornado such that another 100 pounds is removed from the boat weight. Lets's assume that the new boat has the ratios such that it is much faster than the Tornado. This new boat built out of these super materials and super construction methods will cost much more to build than a Tornado. When this new boat costs 1.5 to 2 times as much as a Tornado, how many of these new boats are you going to sell?
Here's another ratio for you, Wouter. If the pitching moment to restoring moment ratio had been calculated for Playstation when it was only on paper, the boat would have been 125ft long in the first place.
Bill