1.88*lwl^.5*sail area^.33/disp^.25 / (1.34*lwl^.5)      The numerator of this equation is an empirical formula that relates high speeds to a long lwl, large sail area, and small displacement. The denominator is the traditional Hull Speed term. Their ratio is a measure of how well our ideal cruising boat will perform under sail. A well designed boat (adequate sail area and light weight hull) will have values are between 1 and 1.1. All out racing machines will be as high as 1.8. I selected 1.0 as the minimum, 1.04 - 1.08 as optimal, and 1.14 maximum.  One should never under estimate the pleasure, and sometimes safety, of owning a fast boat.