The rating system is great -thanks for your time and work in it .

We had hopes of a F-20 class but found Hobie [Hobie Cat FR} matched the EU F-20 rules of sail area and weight but the Inter 20 introduced by NACRA in the US did not .

The F 20 EU rules were on Catamaran CO in the UK for a time as well as other sites years ago .

The Inter 20 class {I thinks it is an official class and has a measurement certificate and rating } not sure though , actually had 15 more sq ft in the mainsail measurement { they didn't include the mast area as the EU version did} and the US version had a noticabley larger sq top on the mainsail . The spin were the same at 270 sq ft .

The Inter 20 also weighed in sat 390 +- Lbs where the Hobie weighted 420 +-

The basis for class racing as equal F -20s did not exist due to these differences .

The prediominent class of 20s in the US was the I 20 which was used in the 1000 mile races and now the Tybee 500 race along with numerous other racing .

Add the T in the mix and other various 20s and its all over the board with different bean L SA design variations .

The best thing that could happen for a future F 20s CLASS would be a new design that took several steps forward in development and performance introduced into the marketplace that was affordable and ideal for all types of racing .

That would then be adapted by groups of racing sailors that would begin a F -20 class based on its measurements .

I understand the F 18 originally came from a group involved in the rating system that wanted an ideal 18 ft class based on it and measurements of typical cats .

The f-18 class in the US was mainly started by a group in my home club of racing sailors --CRAM --to follow siut .

Hope that helps

best regards
Carl

some reference sources

North America Inter Class Assoc. Rules

http://members.tripod.com/NAICA/Rules.html



CRAM
http://www.websitemagic.com/cram/