Longitudinal center of gravity (LCG)

The longitudinal center of gravity LCG is the fore-and-aft position of the ship’s mass centroid, found by summing weight moments of lightship and every deadweight item about a reference and dividing by total weight. Trim is set by the separation between LCG and LCB: when LCG lies forward of LCB the ship trims by the head, when aft it trims by the stern, and the trimming moment is displacement times that separation, distributed using MCT1cm. LCG is fixed by loading, not hull shape, and is one of the controlled outputs of every cargo and ballast plan in the stability booklet. The inclining experiment confirms KG, not LCG, which comes from the weight schedule.