I noticed that Nacra are having a Worlds and Europeans with primarily boats that are not registered as an official ISAF class.
They call it a Nacra F18 Worlds but it will probably be 90% Infusions.
http://nacraeurope.com/news_details.php?id=88I guess ISAF is more relaxed then we think?
Maybe someone from the F16 class could write up a comprehensive report outlining all the pros and cons of joining ISAF?