On the side I'm also working on the class rules (formula type), so are there any windsurfers out there whoe can tell me the most common surface area's for these windsurf sails.

Afterall the formula setup will allow Gareths idea to use windsurfer rigs on these F12's.

Currently I'm thinking about a max sail area limit (single sail) of max 6.0 sq. mtr. on mas 5.25 mtr masts. As for this area and mastsize I know the landyacht rigs will hold (no further design work involved here). But will that be a good max size for the people looking for cheap second hand surf sails.

Quicksilver Steve, can you help us out here ?

Additionally, How far up from the mast base are the booms fitted to the mast on a typical windsurfer ? Also this is needed to make-up the (formula) class rules.

Wouter