Why I-17R? I check with the Nacra web page http://nacra.us/
only F17 was listed. Maybe a little more info on the boat would help ( F17) Anyway, CatFight VII the F16s have been moved with the F17s to the low portsmouth spinnaker fleet. This would be a great event to see both boats in action against F18s, Nacra 20s & Tornados. Per the latest Cat Fight news letter ( #3 )
Quote
Why were I17-Rs at the Nacra F18 World Championships?
They were racing in the Nacra F17 North American Championship.

Ted