Luiz,

You are mostly correct. Actually this is the basis under the F16 design in relation to the F18's. More info found at http://www.geocities.com/f16hpclass/F16HP_to_F18_analysis.html

I may write some things differently in the article if I had to rewrite it as my knowlegde has advanced somewhat over the last 5 years, but the general line of thought is still the same.

Bill Roberts often misapplies this method to components that are not really accurately described by these laws. Example; he uses them to calculate boatweight by scaling, but this is wrong as several aspects are already at their minimum wall thickness etc in the bigger boats. You can't scale such components to smaller dimensions. But displacement calcs etc are accurately described by these laws.

Also the is no need for the crew weight to be adjusted, this can be done by reducing the boat weight by an extra amount and adjusting width to compensate for differences in righting moment. Again this is what F16's have done. It is one of the reasons why the F16 width is 2.5 mtr instead of 2.6 mtr.

Have to go now.

Wouter