I'm largely in favour of these rules; but I have comments on the following points
I would remove the identifiers "halyard lock" or "shackle" and replace them with something alot more general. Actually, sleeved sails use neither a halyard nor a shackle to secure the sail to the top. Pretty popular now is a ribbon cross that forms a small cup and a single line. The mast top is of significant length (say 200-300 mm) in order to keep the sleeve tight at the top and allow the sail to twist easily around the mast. I can put pics on if people don't understand what is meant here. Interestingly enough this setup would allow an upper black band to be visible again.
Basically I would reword this rule so that no part of the sail may be beyond the upper band with the exception of those parts that function ONLY as a means to secure the sail to the compliant position. Of course any real sailarea will have a double function and be non-compliant.
With sleeved sails that just close the top of the sleeve by stitching we can simply require that the top of the mast or the upper black band is no further away from the top of the main beam then 6.00 mtr, which ever is lowest.
Personally I strongly prefer a max luff length measurement as well, mostly because this rule is alot more difficult to break then a black band rule. Afterall, my unstayed mast will be collapsable and it is a 5 euro and 5 minute job to replace the top section with a slightly longer one after getting a measurement certificate. Replacing the sail (with a stamp and signiture) is alot harder and more expensive. With a max luff length the mast black band distance is also implecitly fixed.
Point 1.5.1 Inspection hatches.
To retired geek etc. Marstrom and the F14 builder fit inspection hatches to their sterns which are always flat panels as it will be pretty hard to align the rudder pintles on a curved panel. So this may be the solution to you guys.
Point 1.10.2 For sleeved sails Area = A + As
Firstly I would write down " For sleeved sails; Total area = A + As" and thus refer directly back to the basic rule which is "Total area may not be greater then 7.0 sq. mtr."
Secondly, we must define A properly. Currently it can be argued that the sleeve area must be included twice as who is to say that the "actual area" of a sleeved sail doesn't include the sleeve already ? Also do we included the area of the sail that is inside the mast track or inside the sleeve ? If not then we must exlcude those from the actual area as well. Remember, when things get competitive we can expect some sea lawer to comb the rules for an advantage. Remember the protest at the F18 worlds two years ago about every one being protested for having the compliant peddles on boards ? We better make sure the rules are already as well worded as possible from the start to avoid troubles later.
I would also include organistional rules, event rules and a definitions section to the F12 class rules and make the boxrule section an individual section. These don't have to be as elaborate the versions with the F18 or F16 rules but I still think we should have them. Again to avoid ourselves difficult discussions later.
A point in case. In rule 1.1.1 we refer to the spirit of the rule but we don't really define what this spirit is. We do a little bit of that in the Prologue but it is wise to consider defining a few well worded goals/spirits that can be used as a checklist. Something like.
The spirit of the F12 rule is to
-1- Limit the overall performance of all F12 craft to such similar level that first-in-wins course racing is fair irrespectibally of the craft used by a particular crew.
-2- Have all crews have acces to any F12 design (given reasonable costs) that is most capable of wining a course race if ever a significant difference between makes is ever encountered.
I may spot more points later.
Formula 16 NED 243 (one-off; homebuild)