Theo, Steven is right, the Portsmouth rules are clear that boats using a rating number of a "class" are supposed to race with equipment according to class rules. Some class rules are more restrictive than others. Theoretically, a class that does not allow main downhaul adjustment while racing in class, should not allow it when racing Portsmouth, unless an "adjustment" is made to the number - however small. Likewise, if class rules require daggerboards mfr'd by one mfr, then racing with boards made somewhere else would also require an adjustment of the PN number.
The NACRA class rules are posted at:
http://www.performancecat.com/classassociations.cfmwhich takes you to :
http://members.tripod.com/UNI55/ncr.htmThere does not appear to be any verbiage to allow carbon boards, or rudders, except for sec 5.6 "All such equipment supplied by Nacra shall be considered class legal." So, if you can show that NACRA (or its licensed dealers) provided carbon boards, then they're OK - to buy from them. If they sell carbon rudders for that model, then carbon rudders are OK. I think carbon rudders are legal for NACRA5.5uni, but I'm not sure how you'd know for sure, without asking Performance Catamarans. The class rules don't state it outright.
