Go to the US SAiling web site
If your boat is listed spend the $$ and order a set of polars. Be sure to indicate fixed or folding prop, headsail most often used, etc as that is how the polars will be created. Info is for wind speeds from 6 -20 on all degrees of sail, giving boat speed, TW, AW, angle of heel VMG, % of sail required for optimum performance as the wind pipes up, as well as best VMG on poin of sail as wind dies. WORTH THR $$I race a H34 & we take our share of 1st'sGood Luck PJ