Hi Gary
Believe the proposed F-20 rules do as good a job in intent as possible given the current state of existing conditions and existing 20 ft boats in N A .
And believe a F-20 class for all the existing boats with 8.5 beam -and similar weights and sail areas will eventually emerge from the remaining boats and sailors that are not already in Formula 18s --Formula 16s or Formula 14s
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Think you have hit upon the confusion -difficulty in getting F-20 going in N A .
Neither Hobie or Performance endorse a F-20 in the US -EXISTING BOATS ARE DIFFERENT --diffeent weights -sail areas etc -most do not wish to modify existing 20s --most US CATSAILORS expect to purchase a class boat specifically built to a Formula 20 rule
Current production 20s are all over the range of price and varying specifications .
perhaps H will build their new version to match the Ventilo FORMULA 20 ht or very similar to it to begin a lightweight larger beam production class F-20 in NA with readily available Hobies brands and others to choose from which again is what most US catsailors are accustomed to .
VENTILO-SPECS ARE HERE -
http://www.morrellimelvin.com/page29.html