sailboat design ratios
The interactive sailboat design ratio calculator is accompanied by a free ebooklet 'understanding sailboat design ratios' which will help you make sense of the numbers. our 'sailboat design ratio calculator' takes all the hard work out of calculating the numbers and will provide a valuable insight into a sailboat's performance and handling. 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. Ratios over 18-20 are seen on racing dinghies, inshore racers and ocean racing yachts. the more extreme screamers can have very high sa/d ratios indeed; my 60 foot design, wild thing, had a sa/d ratio, based on 100% foretriangle, of well over 30, depending on her displacement at the moment.. 
sailboat design ratios So, if the boat with the highest sail area to displacement has a value of 48, a boat with a sail area to displacement of 24 would receive a value of .5. for a 'low' search it is the inverse. that is, if the boat with the lowest capsize ratio has 1.3, a boat with a capsize ratio of 3.9 would receive a value of 0.33.. The sa/d ratio is a measure of the power of the sails relative to the weight of the boat. in this case, the higher the number, the higher the performance, but the harder the boat will be to handle. a sa/d ratio above 20 is getting into the lively performance category. i was once on a custom-built racing boat with a sa/d ratio of 40..
