Boat Design Ratios
Another important design parameter is the sail area-displacement ratio (sa/d), another nondimensional calculation that expresses the relationship between a boat’s sail area and its displacement. traditionally, it is calculated by dividing the nominal sail area in square feet by the boat’s displacement in cubic feet to the two-thirds power.. Is it practical to have a deck to keel height of 7.5 feet on a boat with a 10' beam and 34' length? what about a 14.5 foot keel to cabin top height on.... For a boat that must entertain guests at the dock but will rarely be used in rough weather or at high speeds, this may be a significant advantage. the slimmer boat, though, will generally have the advantage when fuel is expensive or when the weather picks up..
Compare these ratios for pearsons. here are some hewlett packard hp-41 calculator programs i wrote for some of the design ratios and some other boat related values. these will run on any of the hp-41 series and on the hp-42. with a little modification they will run on any of the hp rpn machines.. Learning how and why adequate varies by design is the next step. i.e. learning how a speed boat is different from a ‘regular’ boat, and all of the ways a speed boat can kill its occupants. this should involve designing many prototypes, first digitally, then once your design is nearing completion, physical prototypes.. My final boat design was an ocean-going rowboat for rowing solo, non-stop, across the pacific ocean. you can read about the history and development of my boat and mast designs on this, my new website..
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