SQA Chief Mate Stability Theory Practice Test

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How is the "righting lever" defined in stability terms?

As the angle of heel experienced by the vessel

As the horizontal distance between the center of buoyancy and the center of gravity

The "righting lever" is defined as the horizontal distance between the center of buoyancy and the center of gravity of a vessel when it is heeled over. This distance is crucial because it is the lever arm that acts to restore the vessel to an upright position when it is tilted due to external forces, such as wind or waves. The larger the righting lever, the greater the force attempting to right the vessel, thus enhancing its stability.

In terms of stability, a sufficient righting lever is essential for the effective recovery from heel, as it directly influences the vessel's ability to regain its upright position after being tilted. Understanding this concept helps mariners assess how well a vessel will behave in various conditions and how to ensure safety at sea.

As the measure of external forces acting on the vessel

As the point at which stability begins to decrease