Your Ro Ro vessel has just completed discharging the lower decks and is commencing discharging the upper levels. What would it indicate if the vessel were to suddenly develop a list?
• GM (metacentric height) and how it relates to a ship’s stability and stiffness • What happens to a ship’s center of gravity (G) when you discharge cargo from low decks vs. high decks • Why a vessel might suddenly list even when cargo is being discharged symmetrically side‑to‑side
• Think about how removing weight from the upper decks changes the ship’s center of gravity and the value of GM. • Ask yourself: when GM becomes very large versus small/negative, how does the ship behave if it is disturbed slightly from the upright? • Consider whether any of the wrong options (sewage pumping, winch tension) would realistically cause a sudden list during cargo discharge on a Ro‑Ro vessel.
• Verify what excessive GM does to a ship’s initial stability and rolling characteristics. • Verify what negative GM means for a ship’s ability to return to the upright after a small heel. • Check whether symmetrical cargo discharge (port and starboard the same) should shift the center of gravity sideways or only vertically.
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