I'll say at the outset that i do not race, so the answer to the following may simply be that on the water performance is the sole determining factor, but here is the question. I assume that for a one-design class, the maximum allowed area of the jib is defined so why is the recommended rake of the mast dependent on whether a loose, snug or tight rig jib is used? I have North recreational main with a Schurr furling jib (which is probably a bit smaller in area than a hanked-on jib) and I adjusted the rake so that I had just bit of weather helm close hauled and verified that I also had weather helm when sailing full-and-by and then further off the wind. Do the different rig tensions affect the effective area of the jibs significantly (??) or is it just that without a backstay, the Scot mast rake cannot be changed on the water and the mast rake is selected to be the best compromise for all wind strengths. Do I make any sense at all?