Your vessel is damaged and on an even keel. There is no trim. The freeboard is reduced to less than 1 foot. The rolling period is very long, and the vessel is sluggish in returning from a roll. Which action would you take FIRST to improve stability?
• Initial stability (GM) and how it relates to a vessel having a very long, sluggish roll • Effect of free surface in slack (partially filled) tanks on stability • How changing weights high/low or in/outboard affects GM and freeboard when the vessel is already very close to the waterline
• Ask yourself which option most directly reduces free surface effect and increases GM without risking further loss of freeboard. • Consider which choice changes the ship’s internal liquid condition versus adding weight outboard or removing weight from the ends of the vessel. • Think about what happens to stability when you lower heavy boats into the water or jettison deck cargo, especially when freeboard is already less than one foot.
• Which option eliminates or reduces free surface in a partially filled tank instead of creating more slack tanks? • Which action does not further reduce freeboard or bring weights outboard and higher above the keel? • Verify which choice improves GM (initial stability) immediately rather than only changing longitudinal trim or weight distribution along the length.
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