Bill,

You talking about the CFR20 versus Tornado example that has been your favorite for some time now. What they did wrong is what most do wrong; the design looked at various ratios as being independent ratios that would all lead to higher speed. While doing so they overlooked the interaction between ratios and decreased rigting related power more than they decreased the drag. In the lower wind speeds righting is not limitind power and there the boat was fast.

The fact that a design screwed up here doesn't mean that only boats with increased in both area to weight and righting to area can go faster. It is one solution that works but not the only one.

I expect the M20 to go the same way when the design stays at 2.6 mtr width.

Wouter