HZ,

Let me attempt to answer your questions with the information I have. Seems this has created confusion on the definition of "Formula":

What’s the diference between the F17, I17, I17R, EUI17 and the NACRA17 ? ALL THE SAME EXCEPT I THINK MOST OF THE EU17S ARE THE SMALLER ALUM MAST. THERE IS INTEREST OVER THERE IN THE 17R.

Do they all fit the new Formula 17 rule? NO.

Who are all the manufacturers? NACRA IS THE ONLY ONE.

Does the Hobie FX1 fit the rule? NO. THIS IS NOT A "FORMULA" CLASS. IT'S THE INTER17R/NACRA17 CLASS ONLY.

Hope this helps!!

Bob