So, any heel beyond this angle would result in a condition of negative stability. The point where the GZ curve meets the horizontal axis (shown as ‘C’ in the figure), is called the point of vanishing stability, since righting lever becomes zero at this point.Why? Because, beyond this angle, the righting lever (in other words, the stability) of the ship decreases drastically. In other words, the maximum righting lever when multiplied with the displacement of the ship, gives us the value of the maximum heeling moment that the ship can sustain without capsizing. The value of maximum GZ and the angle at which it occurs, are important values.
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