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#1
08-28-2009, 06:45 AM
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| Delft series I am currently workng on a delft series excel program. I am using the regression coefficients which were based on pre 1992 yachts as i am designing a heavier displacement classic cruiser. Im not too sure if I have got the correct equation. has anyone got a link to this equation. I seem to be getting silly figures such as 1500kN at a Fn of 0.35 for a 13 m lwl and 20 odd tonne yacht?!!   |
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#2
08-29-2009, 03:56 AM
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| The residual resistance number is more or less on the spot but not kN, just N. Don't forget viscouse resistance. Terho
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#4
08-29-2009, 07:25 AM
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| I always use 2-4 methods for resistance prediction (of course, proper methods with matching parameters). Never trust only one method to predict the resistance... For heavy displacement boat - try trawlers/tugs series. Delft series is known to underevaluate resistance of heavy motorsailers, while formally parameters of series match. |
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#5
08-29-2009, 07:36 AM
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| This is sample for 16m trawler-style boat powerboat, calculated by same software. Need to say that formally boat fits in parameters of Delft series, but resistance is very different due to variations of hull shape. |
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