I've actually done the math and modelling on the F12 and interestingly enough it is not suited to say 5 or 8 year olds.

If you scale the basic catamran design down to 10 or 8 feet then you run into other problems, like pitching resistance. The catamaran design doesn't lend itself very well to very short hull lengths. That is one of the reasons why the F12 is what it is now, geared towards 12-16 year old youths and light adults.

Other designers and project teams are invited to create and succesfully establish (smaller) cats geared towards smaller sailors, but I'm not going to do it.

Wouter