what determines a coastal cruiser???
Numbers really don''t do you much good because they really don''t refect engineering or workmanship. They also somewhat change with length. For example a modern 36 foot or more foot boat with an L/D in the range of 150 to 160 and a SA/D of well over 20 can be a good offshore cruiser with all of the right boxes checked. While a smaller boat might require as much as and L/D over 200 to be a good offshore boat. Of course traditionalists push the L/D ratios upward to 250 to 300 as a good range.
A better way to think about size is that traditional cruisers generally used a rule of thumb of 3 to 6 (long) tons of displacement per person as a good rule of thumb for sizing long distance cruising boats. Better hardware amd the need to haul all kinds of stuff around with us, has pushed up the upper number up a bit and lighter, stronger boat building techniques and longer boat waterline lengths relative to length on deck has allowed the bottom number to be pushed down a bit.