After jacking down your liftboat you have an unexpected list. You find that the only cause of this list must be a flooded leg. The list caused by a flooded leg means your vessel has a(n) __________.
• GM (metacentric height) and what a list tells you about initial stability • Effect of flooded spaces below the waterline on buoyancy and righting arm GZ • How a change in underwater shape affects waterplane area and the chance of deck edge immersion
• Ask yourself: if a leg floods on one side and the vessel takes a permanent list, does that suggest stability has improved or been reduced? • Think about what happens to the righting arm curve GZ vs. heel when buoyancy is lost low down on one side—does the maximum GZ get bigger or smaller? • Consider whether a flooded leg would increase or decrease the underwater footprint (waterplane) in a way that makes the vessel more or less resistant to heeling.
• Link a permanent list (not a temporary heel) to what that usually means about GM and overall stability • Compare the choices that talk about increased stability versus those that imply reduced righting ability • Ask: with a flooded leg, is the vessel more or less likely to reach deck edge immersion early in the heel? Eliminate any option that contradicts that.
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