The only real draw back of F11 is that you are both reducing overall weight (bouyancy) and hull length (pitch leverage) meaning that the sail area you can carry will reduce more then the length of the boat.
Not necassarily only with a certian hull shape, it will be harder to aheive the same pitch resistance granted but....
Also you can change the aspect ratio of the sails, to give you the same pitch resistence for the same sail area. There are lots of things you can do.
The same argumant you are using to extend 12 to 12'10" can be used for going to 13' or 13'2" etc
I am interested how many sheets of ply do you require to make your F12 design.
Gareth
