What is reserve buoyancy?

What is reserve buoyancy?

• A. The buoyant force acting on the hull.
• B. The portion of the hull not submerged, providing stability and flotation in emergencies.
• C. The weight of water displaced by the hull equals ship weight.
• D. The total displacement of the ship.

Answer: (B)

Reserve buoyancy is the portion of the hull that remains above the waterline when the ship is afloat. That unflooded volume provides extra buoyant force and helps keep the ship afloat and stable if flooding or damage reduces buoyancy. It comes from the part of the hull above water—the freeboard and superstructure—that isn’t submerged. Designers aim to maximize this reserve to improve survivability, giving more time to respond to damage. The other ideas describe the total buoyant force on the hull or the ship’s overall displacement, not the extra safety margin provided by the unflooded hull.

Reserve buoyancy is the portion of the hull that remains above the waterline when the ship is afloat. That unflooded volume provides extra buoyant force and helps keep the ship afloat and stable if flooding or damage reduces buoyancy. It comes from the part of the hull above water—the freeboard and superstructure—that isn’t submerged. Designers aim to maximize this reserve to improve survivability, giving more time to respond to damage. The other ideas describe the total buoyant force on the hull or the ship’s overall displacement, not the extra safety margin provided by the unflooded hull.