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Pitch (or pitching) is the longitudinal rotation of a vessel; resulting in the bow rising and falling. A pitching vessel is prone to slamming. The point which the pitching motion acts through is known as the quiescent point (point of no motion), which can generally be approximated as the LCG.

Estimating Pitch

Pitch is measured by the pitching period (TP), the time it takes for a vessel to complete one complete pitching rotation. The pitching period will increase as the radius of gyration (KL) increases, and decrease as the longitudinal metacentre (GML) increases. They are related by the formula:

TP = 2 x π x (K2 ÷ (g x GML)0.5)

As vessel length increases, pitching period tends to increase as well.

See Also

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