CA (31) A submarine which may be approximated to a section 4.0 m square by 1.0 m deep comprising of 4 equal compartments (ballast tanks) is divided by vertical diaphragms. The submarine vessel is made up of 6.0 mm thick metal composite throughout the body, weighing 78480 N.m³. Calculate the metacentric height when floating or submerged in the sea (Specific weight of sea water is 10006 N.m³): (i) With no water inside. (ii) When sea water is filled in all the compartments to a depth of 0.30 m. Forward fin (Starboard) Aft fins (Port & Stbd.) Aft fin (starboard)
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Answer:
A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide stability for a vessel. Using water in a tank provides easier weight adjustment than the stone or iron ballast used in older vessels. It also makes it easy for the crew to reduce a vessel's draft when they enter shallower water, by temporarily pumping out ballast. Airships use ballast tanks for similar advantages.The basic concept behind the ballast tank can be seen in many forms of aquatic life, such as the blowfish or argonaut octopus,[1] and the concept has been invented and reinvented many times by humans to serve a variety of purposes
Some submersibles, such as bathyscaphes, dive and re-surface solely by controlling their buoyancy. They flood ballast tanks to submerge, then to re-surface either drop discardable ballast weights, or use stored compressed air to blow their ballast tanks clear of water, becoming buoyant again.
