HomeCalculatorsMoment to Change Trim 1 cm (MCT1cm)

Moment to Change Trim 1 cm (MCT1cm)

MCT1cm converts a longitudinal weight-moment into an expected trim change. Essential for any loading, ballasting, or cargo-shift operation.

StabilityTrim

Inputs

Displacement ΔtLongitudinal GM (GM_L)mTypically 100–300 m for displacement ships. From hydrostatic tables.Length between perpendiculars L_ppm

MCT1cm

450.00t·m / cm

Each t·m of longitudinal moment trims the ship 0.00 cm.

Formula, assumptions, and limits

GM_L is the longitudinal metacentric height. Because L is much greater than BM_t (transverse), GM_L is a large number (often 100–300 m) so the trim response to a weight shift is linear and predictable.