Vertical Cg

MARITIME – HULL & NAVAL ARCHITECTURE CALCULATOR Vertical Cg A precise tool.
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What is the Vertical Cg & How does it work?
The vertical centre of gravity (KG) of a vessel is a crucial stability parameter that indicates the height of the combined centre of mass of the hull, machinery, cargo and crew above the baseline. It is obtained by taking the weighted average of the vertical positions of all individual masses, which can be expressed succinctly as the total vertical moment divided by the total weight. Accurate estimation of KG allows naval architects to assess stability margins, trim, and the effect of loading conditions on the ship’s behaviour at sea.
KG = frac{M}{W}
KG = vertical centre of gravity (m above baseline)
M = total vertical moment (tonne·m)
W = total displacement (tonne)
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Parameters
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Frequently Asked Questions
What is the vertical center of gravity in a ship?
The vertical center of gravity (KG) is the height of the combined center of mass of the hull, machinery, cargo, and crew above the baseline.
How do you calculate KG for a vessel?
KG is calculated by dividing the total vertical moment by the total weight of all masses on the ship.
Why is knowing KG important in maritime navigation?
Knowing KG helps naval architects assess stability margins, trim, and how loading affects a vessel's behavior at sea.
Can you explain the formula for calculating KG?
KG is calculated using the formula: KG = Total Vertical Moment / Total Weight.
How does changing cargo affect the KG of a ship?
Changing cargo shifts the vertical moment, which directly affects the KG and can impact the vessel's stability and trim.
What is the baseline in ship calculations?
The baseline is a reference line used to measure the height of the center of gravity (KG) above it.
How does KG relate to a ship's stability?
A lower KG generally increases a ship's stability, as it reduces the moment arm for righting forces during heeling.

Results are for informational purposes only and do not constitute professional advice.