While the SL16 technically doesn't fit within the F16 class rules, it is so deficient in all areas of physical measure save for the jib size, where it is BARELY in excess, that not allowing it to race as an "accepted" F16 boat is too literal an interpretation of the class rules (IMO).

That said, the discussion does raise the issue of how much variation from the rules should be allowed for boats that were not designed with the F16 class in mind, but are close enough to be considered members?