beam/(disp/(.9*64))^.333     A seaworthiness factor derived from the USYRU analysis of the 1979 FASTNET Race, funded by the Society of Navel Architects and Marine Engineers. Values less than 2 are good. The formula penalizes wide boats for their high inverted stability and light weight boats because of their violent response to large waves. All multi hulls, some modern coastal cruisers and many racing designs have problems meeting this criteria. Since safety is a very important feature in a cruising boat, I selected values less than 1.8 for full credit  Anything over 2 scores zero.