[quote=Beest]I've been sort of interested in this too...wikipedia has the best summary that I can understand...take a look. Formulas are provided and it also shows how the two are related. But if I understand it correctly, portsmouth yardstick numbers are adjusted annually with empirical data (race results) and your number may vary from race to race due to estimated wind speed. Providing the US Sailing link as they administer the rating scheme for the United States.
[url]http://en.wikipedia.org/wiki/Portsmouth_yardstick[/url]
[url]http://offshore.ussailing.org/Rating_Rules.htm[/url][/quote]
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