With a TRUE C0 (so passes 75% rule) the rating gets slower to 0.989 (from 0.982)
If the sail FAILS the 75% test, then it gets a little more complex as we rate it as a Jib and thus need the luff length.[...]
If the sail fail the 75% rule, then you need two on board, the luff must be less than 6m and the sail area less than 3.7m2. Aka, you can't have a code 0 not making the 75% rule and stay F16 class legal.
If your aim is to make a killer low wind condition sail on handicap and not stay class legal make the damn thing go to the top of the mast instead of stopping at 7.5m and sheet it from blocks installed on poles on the back of the hull , it should be possible to fit 35 to 40m2 of monster jib there
Even more if you make the pole longer...
The only way to stay class legal is to make something that passes the 75% rule and measure less than 17.5m2, sacrificing sail area for a more polyvalent sail which can be used upwind. Is this possible? Probably: the tornado guys did it and their mm measurement are far more restrictive and equivalent to a 81% girth rule... But then, this hypothetical sail will be interesting in a small range of conditions: relatively low wind, probably not good enough for a W/L course unless you are slowed down by current upwind, so courses with runs or really tight reaches are probably preferred.
Possible, but a headache. However if someone makes a sail, I'm voluntering to test it
