The Java applet below will calculate various standard sailboat ratings. Not all fields need to have values entered as the applet will perform only those calculations for which it has sufficient values. Information on interpreting the various formulas can be reached by clicking on the links below. Hull Speed is calculated based on the length of a displacement-type hull at the waterline. At her theoretical maximum hull speed a boat rides in the trough between two wave crests.
Waves travel at a rate based on the distance between their crests.
The Capsize Screening formula was developed by the U.S. Sailing Association to judge the safety of offshore sailboats. Values lower than 2.0 are considered safe for offshore sailing. The rating improves as the displacement increases and the beam decreases.