[quote=erice]my nacra 5.2 carries 19.6m2 of sail if you add jib to main
an 18square is going to have a taller mast with a more efficient sail but it is probably going to have less sail area than your prindle
the extra width is going to give your weight more righting moment which should help make up for the shorter hulls but you still might not get past 19knots, you might need more sail and length for that, something like a nacra 5.8 should do it
the extra width will also make the boat a little slower in light air as the windward hull will be more "sticky"
imho the 18m2 class is dead for a reason...[/quote]
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