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Assessment of reference plane impact on longitudinal moment of inertia and the moment to change trim in naval architecture

Kacprzak Paweł

Zeszyty Naukowe Politechniki Morskiej w Szczecinie

2025

nr 84 (156)

200--208

This paper presents a numerical approach to evaluating ship waterplane hydrostatic parameters. The analysis focuses mainly on determining the longitudinal moment of inertia, computed relative to both the aft perpendicular and the midship section. This study is performed for a 9000 DWT general cargo ship with a design draught of 7.5 m. The results show small differences in the longitudinal moment of inertia (IL), which subsequently affect the moment-to-change trim (MTC). However, the study demonstrates that these differences, resulting from the selected point of origin, have a negligible impact on trim calculations. Despite minor mathematical discrepancies, their overall effect is insignificant, with IL deviations within ±0.1%, confirming that these variations do not influence practical trim calculations.