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Ship Stability Principles

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Metacentric Height (GM)

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The distance between the centre of gravity (G) and the metacentre (M), an indicator of ship's initial stability; the larger the GM, the greater the ship's stability.

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A permanent inclination of the ship due to the uneven distribution of weight onboard, which can be due to cargo shift or water ingress.

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Deadweight

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The measure of a ship's carrying capacity, including cargo, fuel, passengers, crew, etc., which impacts stability by changing the vessel's draft.

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Cross Curves of Stability

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Graphs showing the relation between the righting arm (GZ) and the angle of heel for various vessel displacements, vital for analyzing stability across a range of conditions.

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Damping

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The process by which the amplitude of an oscillation (like rolling) is gradually reduced over time, influenced by the ship's hull design and added structural elements.

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Heeling

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The inclination of a ship to one side due to external forces, such as wind or turning, which is not necessarily related to a lack of stability.

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Bilge

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The lowest compartments on a ship, where water typically collects and can affect stability if not properly managed by bilge pumps.

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Righting Lever (GZ)

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The horizontal distance between the centre of gravity and the centre of buoyancy when a vessel is inclined; a moment that tends to restore a vessel to the upright position.

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Center of Gravity (G)

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The point in a body or system around which its mass or weight is evenly distributed or balanced and through which the force of gravity acts.

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Pitching

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The angular movement of a ship around its transverse axis, causing the bow and stern to move up and down alternately in a seaway.

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Dynamic Stability

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The ability of a ship to return to an equilibrium position after being subjected to external forces, considering the energy needed to displace it from upright.

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Free Surface Effect

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The phenomenon where liquids within a ship's tanks or compartments shift, reducing the ship's stability, especially in partially filled tanks.

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Watertight Integrity

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The condition of a ship's hull and superstructure that prevents water ingress, critical for maintaining buoyancy and stability.

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Reserve Buoyancy

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The volume of a ship's hull that is above the waterline, which contributes to the vessel's ability to remain afloat and resist capsizing.

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Buoyancy

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The upward force exerted by a fluid that opposes the weight of an object immersed in it. Crucial for keeping ships afloat.

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Hydrostatic Curves

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Graphs showing the relationship between ship stability factors (such as metacentric height, buoyancy, etc.) and the vessel's displacement or draft.

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Angle of Loll

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The angle to which a ship with negative stability will rest in calm water without any external forces acting upon it.

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Initial Stability

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The stability of a ship at small angles of inclination, typically related to the metacentric height (GM) and influenced by the distribution of mass.

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Rolling

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An oscillating movement of a ship around its longitudinal axis caused by external forces like waves or wind, which can affect stability.

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Ballast

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Material (often water) placed in the ballast tanks of a ship to increase stability, trim, or draft, essential for safe operational handling.

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