They aren't illegal cause they were made before they changed the rules.

The way i read it is the "one cloth throughout the body of the sail" stuff excluded a lot of construction techniques. I'd like to see you argue that a 3di sail was the same cloth throughout. Anyway guess ill just have to use the rules as they are, as its too late to complain now. Just dont want that sort of thing to happen regularly.

I wonder how much lift you could get out of 6 degrees of cant on your centre boards?