This is going pretty much on gut feel (read: I don't have any factual information) but I feel pretty sure that the intent is to run two different one-design fleets. However, I have yet to hear of any F18's with intent to race this year.

Seriously though, I think an F18 fleet in the Tybee500 would be great exposure for the North American F18 fleet and the Tybee 500 ... it could also help the race to attract some more European sailors. It's an incredible stretch of coast.