The following figure illustrates a transverse section of an MBT. We will look into the parts and components of a main ballast tank to understand the sequence followed in diving and surfacing. We will first look into the diving and surfacing techniques before going further into stability and understanding how submarine works. So how weight added to the submarine? Remember Main Ballast Tanks (MBTs)? Sea water is taken into these tanks, and this added weight of the sea water increases the weight of the submarine, which allows the submarine to dive. It is only then that in submerged condition, the buoyancy on the volume of the submarine above the waterline (in surfaced condition) can be balanced by the additional weight.l This also implies that for a surfaced submarine to submerge, the total weight of the submarine has to increase. The fundamentals of floatation and Archimedes’ Principle are used to arrive at the equation of floatation of a submarine, that is, in either of submerged or surfaced condition, the weight of the submarine is equal to the buoyancy force acting on it. Submerge Stability (when the submarine is completely submerged, and no part or appendages are above the waterline).Surfaced Stability (when part of the submarine is above the waterline), and.The most unique feature of submarine design stability is that unlike ships, submarine stability is studied at two conditions: This article also assumes that you are familiar with the basic concepts of ship stability. It is hence recommended that you read the previous part prior to this to understand submarine design basics. That is because, design in itself is a complex and long process that includes both understanding and implementation. You will soon understand why we did not discuss the stability aspect of submarines in the previous article itself, rather had f ocused on familiarising ourselves with the main parts of the submarine.
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