All other things being equal (hull design and size, sail plan, etc), what is the relationship between boat weight and speed? Can it be expressed mathematically, i.e., double the weight = 1/2 the speed? I like traditional construction but I'd like to know if I'm giving up significant performance vs lightweight/modern construction methods. Also, does passenger and gear weight have the same effect? In a small boat (100-200 lb) that would far outweigh diffences due to construction methods.