The design ratios sponberg yacht design inc. 3 preface in january 2010, a gentleman in austria (“capt. vimes”) visiting the internet forum boatdesign.net asked a question about the center of flotation and its implications on boat design and performance. i happened to be the first responder to the question, and. Forum posts represent the experience, opinion, and view of individual users. boat design net does not necessarily endorse nor share the view of each individual post. when making potentially dangerous or financial decisions, always employ and consult appropriate professionals. your circumstances or experience may be different.. Essential design data. hull design ratios. with the vessel upright, the curve is at zero. as the boat heels, the center of buoyancy moves outboard, while the center of gravity remains stationary. this creates a righting arm or righting lever. it is the horizontal distance between the upward buoyant force and the downward force of gravity..
Length-beam ratio. definition. l/b = length divided by beam. units: dimensionless. usually, the waterline dimensions l wl and b wl are used for monohulls, or for a single hull of a multihull. what it's used for performance. boat design ‹ wetted surface area up bottom loading. The terms and ratios that follow are used by all yacht designers so it's a good idea to have an understanding of them if you are considering buying a boat, or having a custom design created (of a classical style, of course!).. For example, my boat, a hunter production boat, rancho relaxo, has a displacement of 17400 pounds (divide by 2.205 if you insist on kilos, but don't try metric conversion on the other ratios because most were developed for imperial measurements) and ballast of 7900 pounds..
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