The trim in the above equations represents the total amount of trim including baseline trim, initial trim and false keel trim, and d em the effective mean draught including false keel depth at mid-ship. The correction of N'r is not found in this analysis. Kijima's trim-correction model includes Cb/(L/B), this parameter, however, has no contribution to the correction of these fishing vessels and expressed only by τ' as shown eq.(10), though the Cb/(L/B) of tested ships are quite different from each other. The subscripts "0" in eq.(10) represents linear hydrodynamic derivatives without trim. In this expression, Kijima's empirical formulas written by eq. (11) are used. The relation of linear derivatives between measured and estimated are shown in Fig.8, where it is found that the linear derivatives well agree with the measured one.

　

　

 where, k is the lateral aspect ratio of ship (k=2dem/L).