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4.2 Non-linear hydrodynamic derivatives
 
 Measured non-linear derivatives of hull are plotted in Fig.9 - Fig.11 . Although these derivatives have not been proposed yet as a function, they are described by trim or dem/B for these fishing vessels.
 The derivatives of X'H can be as expressed as the following simple formulas even though the data size is limited.
 
 
Fig.9 
Effect of trim or dme/B on non-linear hydrodynamic derivatives of X',H
 
 
 







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