Posted by Mike on Monday, December 17, 2007 at 8:38am.
GM is not changed, but the righting arm is. If you move G/2 to each side perpendiular to GM, so that G is unchanged, then heel the ship, then draw (or calculate the righting arm for each G/2 mass), the NET (one side is positive, one side is negative) righting arm is increased, due to the distances from each G/2 to the vertical BM line. One then has has a net increased righting arm, with a decreased mass (G/2). The ship will be not so tender, and have a longer roll period.
The idea is to make a vessel less tender so that it does not take on the shape of a high wave and roll over, but rolls more slowly. In practice, shifting fuel ballast or cargo in heavy seas is dangerous and is usually to be avoided.
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