Wouter... a great nod to the larger racing scene is not an adequate basis for rating the boat. ANY class gets consulted and asked for data but they are not determining the rating or do they necessarily agree with the published rating in a PN system. The history of the F16 rating process ... was unfortunate.

Portsmouth was unable to fairly rate the two boats (2up or one up) (There were lots of reasons then and the situation is more difficult in 2010). The need for a PHRF like adjustment nod was a solution to the systemic problem of the PN system.

The alternative measurement rating system that would most likely be adopted in the USA would be ISAF's SCHRS which indicates a real difference in performance. How accurate the SCHRS rating system is for single handers is an entirely different issue for the general discussion forum. The international multihull council would be the appropriate organization to drive a consensus between the measurement rating systems ... or simply to pick one that they determine is fair.

I am suggesting that the class be proactive and address the mismatch for the US Portmsouth system for the upcoming 2010 season. (Mind you this is a thread about how much junk you can dump to lighten the boat but the impact on your PN rating was overlooked.)