Barry, could you point me to the North American F-20 rules you are racing under? Who govern them? Seriously, I would like to read them and know this. I have been unable to find anything like it, except some suggestions made by Carl on this forum.

I have failed to find an international set of rules or organisation also, so I have so far concluded that there are no international F-20 class. Would be good if there indeed was somebody taking care of this.

What you describe in north america doesn't sound like formula racing, it's one-design racing with a few stray dogs. If you have a good racing circuit going for the Nacra/Inter-20's and the 6.0's, thats great. If you was to gather the 'light and wide' 20-foters in a formula class, what would you call that class (please dont say Formula-20HT)?