AB Vessel Stability and Trim Flashcards
6 cards from real AB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 AB Vessel Stability and Trim flashcards as text
What is the 'angle of loll'?
Answer: The angle where an initially unstable vessel finds equilibrium by heeling to one side
Angle of loll is the heel angle at which a vessel with negative GM achieves a new equilibrium by lying over to one side.
What is the correct action if a vessel develops a dangerous list?
Answer: Transfer ballast or shift cargo toward the high side
To correct a list, ballast water is transferred or cargo is shifted to the high side, moving G back toward the centerline.
What is the 'metacenter' (M)?
Answer: The theoretical point through which all buoyancy force lines pass at small angles of heel
The metacenter is the theoretical intersection point of successive buoyancy force lines as the vessel heels through small angles.
What effect does adding heavy deck cargo have on vessel stability?
Answer: Raises G and reduces GM, decreasing stability
Adding weight high on deck raises the vessel's center of gravity G, reducing GM and decreasing initial stability.
What is 'deadweight tonnage' (DWT)?
Answer: The total weight a vessel can carry including cargo, fuel, stores, water, and crew
Deadweight tonnage (DWT) is the total weight a vessel can carry when loaded to her assigned load line marks, including cargo, fuel, fresh water, stores, and crew.
What is the significance of the 'righting arm' (GZ)?
Answer: It is the horizontal distance between G and the line of buoyant force, measuring the vessel's ability to recover from heel
The righting arm (GZ) is the perpendicular distance between the center of gravity and the vertical line of buoyant force; it quantifies the vessel's ability to right itself at any given angle of heel.