It's not the most intuitive navigation: www.ussailing.org -> offshore -> Portsmouth_Yardstick -> Portsmouth Yardstick Index -> Current Tables -> MH Modification Factors

MH Modifiers

To answer your question you take the MN hit "For non-class legal mainsail, of same sail area or less than class legal mainsail (formerly square top adjustment)".


David Ingram
F18 USA 242
http://www.solarwind.solar

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