disp/(.65*(.7*lwl+.3*loa)*beam^1.33)     This is an empirical term developed by yacht designer Ted Brewer. Large numbers indicate a smoother, more comfortable motion in a sea way. The equation favors heavy boats with lots of overhang and a narrow beam. These are all factors that slow down a boats response in violent conditions, which is a major factor in reducing crew fatigue. This design philosophy is contrary to many modern racer / cruisers. A value of 30 - 40 is recommended for a cruising boat. Racing designs are typically less than 30, and a full keel, Colin Archer design, could be as high as 55. Ted’s recommendations were used for the optimal values, with a minimum of 25 and a maximum of 50.