At the moment there's no Formula 17 Class, so I guess its ok to use the F to designate a boat model. The Nacra 17 is mainly sold in Europe & North America. The European Nacra is a N-17 smaller main & aluminum mast. The NA version is sold with a larger main & 30' carbon mast. The F17 class rules like the Formula 18 class rules allow two different spinnakers base on weight of the crew. The Austrailian version of the 17 has nothing in common with the N17 or F17. Not the same hulls, mast,or sails
Have a great sailing season <img src="http://www.catsailor.com/forums/images/graemlins/smirk.gif" alt="" />
Ted