I am writing this email regarding calculating the value of the A, B, and C matrix (IITC Regression law). I am getting different values A, B and C based on input software estimation and manual calculation.
Input value: z= 0.4526 m
Kxx/B=0.4; Kyy/L=0.25 and Kzz/L=0.25, L=7.2786 m
Output value (inertia matrix in body primary frame; 3D, half body):
E= D=F=0 [kg.m2]
Case 2(in 3D):
Manual calculation based on Kxx= 0.4076 m; Kyy= 1.82 m and Kzz= 1.82 m, m= 1648.2 kg
Based on the software estimate and manual calculation both are different (Source: FINEMarine user guide, page 332). Therefore I request you to kindly clarify the difference between manual and software. Therefore, I request you kindly help me calculate this value.