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
How is 'trim' defined in naval architecture?
Answer: The difference between the forward draft and the after draft
Trim is the difference between the after draft and the forward draft, indicating whether the bow or stern is deeper in the water.
What is the 'center of buoyancy'?
Answer: The geometric center of the vessel's submerged volume
The center of buoyancy (B) is the geometric center of the submerged hull volume, through which the upward buoyant force acts.
What is 'freeboard'?
Answer: The vertical distance from the waterline to the main deck edge
Freeboard is the vertical distance from the waterline to the main deck edge amidships, representing the vessel's reserve buoyancy.
What does 'displacement' mean when applied to a vessel?
Answer: The weight of water displaced by the hull, which equals the vessel's total weight
By Archimedes' principle, a floating vessel displaces a weight of water exactly equal to its own total weight, and this is called the vessel's displacement.
What does the load line (Plimsoll mark) indicate?
Answer: The maximum safe loading depth in various zones and seasons
The load line (Plimsoll mark) shows the maximum depth to which a vessel may be loaded under various sea area and seasonal conditions.
What effect does adding weight to a vessel have on its draft?
Answer: It increases draft as the vessel sinks deeper
Adding weight increases the vessel's displacement, causing it to sink deeper until the additional buoyant force equals the added weight.