Bill,

I didn't misuse your information Bill, I just pointed out that you can't use the 3rd order approach to proof that the RC30 hulls are indeed light for their size.

In simple terms teh RC30 hull are not at all similar to a 18 foot platform that is scaled up by a factor of 1,66 in all directions.

The RC30 hull maybe be 1,66 the length of an 18 foot hull but it is more likely to be only 1.3 times the width and depth.

By assuming it is nothing more than a scaled up 18 foot hull with the same factor for all dimension you made it look like a comparable 18 foot hull would have to be lighter than what anybody else is producing at this time. Including A-cat hulls.

If we would continue the 3rd order approach to 16 foot cats than a Taipan hull of 22 kg's has to be only 12 kilograms to be equivalent to your RC30 hull.

That is why I made the calcs that compared displacement of both boats. You will find that displacement doesn't follow a 3rd order trend either so why would hull contruction be accurately described by it. Afterall displacement is the most important design parameter when designing a cat hull.

Bill, I truelly respect your vast amount of experience, standing and the cats designed by you but when it comes down to applying formula's I've found myself to be in strong disagreement with you.

And may post are just that; disagreements on how formulas like Froudes law are used and applied. Nothing more,

Wouter