The longitudinal distribution of forces acting on a T2-SE-A1 tanker moving in regular head seas is found by an analysis based on the "strip method" used by Korvin-Kroukovsky in the development of his theory of ship motions, lending moments at the midship section are calculated and compared with bending moments measured during model tests. The theoretical values of bending moments are of the same order of magnitude as those found in the experiments. However, some discrepancies between them appear. These may be due to experimental error as well as to deficiencies in the method of calculation. Certain important facts are brought out by the theoretical calculations:

  1. The midship bending moment is virtually a second-order effect dependent on local variations in the longitudinal distribution of the loads.

  2. Dynamic bending moments at reasonable speeds are less than those obtained by the conventional static calculation with Smith correction.

This confirms experimental findings.

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