The design ratios a naval architect’s dozen (or thereabouts) a primer on some basic principles of naval architecture for small craft. as first published on boatdesign.net, january – march, 2010.. Hspd = hull speed hspd = sqrt(lwl)*1.34 this is the theoretical hull speed for a displacement hull (like most sail boats). it is a function of the length of the wave created by the boat as it moves through the water.. The theory of this ratio is to indicate the boat's "stiffness", which is resistance to heeling or ability to stand up under sail. forty-five percent is a high figure and indicates that rancho should be able to stand a formidable amount of sail before reefing is required..
The d/l ratio gives a sense of a boat’s speed potential – the lower the number, the faster the boat. the trade-off for speed potential is a lighter boat with a more rapid, less comfortable motion, ok for a coastal cruiser but not nearly so much fun offshore.. If a boat can plane, smaller l/b often suggests more efficient performance at low planing speeds. the balance generally tilts in favour of high l/b for fast boats. the balance generally tilts in favour of high l/b for fast boats.. The design ratios. a naval architect’s dozen (or thereabouts) a primer on some basic principles of naval architecture for small craft. as first published on boatdesign.net, january – march, 2010..
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