Why is submarine a boat

Others such as Kel Roberts are eager to massage the amalgam. In so many ways. Geoff Lyons votes for a third way. I think you mean sangas, mate.

Ultimately, whichever mash-up or utterance prevails, there remains one cloud hovering over the whole affair. They are boats. But why? The short answer is scale. So goes the golden rule, despite that gold tarnishing a little since being coined. Each sub measures some metres long, weighs tonnes without a sailor aboard. Rooms are cabins, windows are portholes, walls are bulkheads. Left is port, and so on. As the submarine dives, the ballast tanks are flooded with water and the air in the ballast tanks is vented from the submarine until its overall density is greater than the surrounding water and the submarine begins to sink negative buoyancy.

A supply of compressed air is maintained aboard the submarine in air flasks for life support and for use with the ballast tanks. In addition, the submarine has movable sets of short "wings" called hydroplanes on the stern back that help to control the angle of the dive.

The hydroplanes are angled so that water moves over the stern, which forces the stern upward; therefore, the submarine is angled downward.

To keep the submarine level at any set depth, the submarine maintains a balance of air and water in the trim tanks so that its overall density is equal to the surrounding water neutral buoyancy. When the submarine reaches its cruising depth, the hydroplanes are leveled so that the submarine travels level through the water.

Water is also forced between the bow and stern trim tanks to keep the sub level. The submarine can steer in the water by using the tail rudder to turn starboard right or port left and the hydroplanes to control the fore-aft angle of the submarine. In addition, some submarines are equipped with a retractable secondary propulsion motor that can swivel degrees.

The submarine operates using the Archimedes' principle by manipulating the buoyancy. That means the weight of the submarine equals the amount of water it displaces. The submarine will neither rise nor sink in this state. To make the submarine rise again, compressed air is simply blown into the tanks forcing the seawater out. The submarine gains positive buoyancy becomes less dense than the water and rises. In current design concept of the submarines modularity at design level, construction and manufacturing contributes the main factor for efficiency in building a submarine.

For example Malaysian Scorpene Submarines constructions are being held at France and Spain shipyards. Beside the modularity the main factor for safety design is to improve acoustic detection by improving the sonar performances, data computations performances, reduce the hydrodynamics and self noise.

In most submarines design all the equipments shall not linked directly to the pressure hull and elastic mounting system to reduce the vibration level on ship. Some design used the suspended platforms and cradles to fit these requirements.