![]() Yu 3 was laid down in 1943 by the Hitachi Kasado Works ( Hitachi Kasado Seisakujo) at Kudamatsu, Japan. None carried torpedoes or had torpedo tubes. The Yu I type was produced in four subclasses, each produced by a different manufacturer and differing primarily in the design of their conning towers and details of their gun armament. Only submarines of the Yu I type were completed and saw service. In the final two years of World War II, the Imperial Japanese Army constructed transport submarines - officially the Type 3 submergence transport vehicle and known to the Japanese Army as the Maru Yu - with which to supply its isolated island garrisons in the Pacific. Constructed for use during World War II, she participated in the Philippines campaign of 1944–1945, supplying Japanese forces in the Battle of Leyte, and was scuttled at the beginning of 1945. Yu 3 was an Imperial Japanese Army transport submarine of the Yu 1 subclass of the Yu I type. Probably scrapped or scuttled sometime after July 1945.Furthermore, the hydroplanes are angled in such a way that water moves over the stern, pushing it down and making the submarine ascend faster.Imperial Japanese Army Yu 1-class submarine This results in a decrease in the overall density of the submarine, causing it to rise to the surface. ![]() On the other hand, when a submarine has to resurface, compressed air is blown into the ballast tanks from air flasks, which pushes the water out of the tanks at a rapid rate. The angle of these ‘wings’ directly influences the speed of the dive. In addition to the flooding of the tanks, two ‘diving planes’ also aid in controlling the speed of descent for the submarine. ![]() The crew allows the surrounding water to fill the tank until the desired depth is reached, after which the valve is closed to stop any more water from rushing in. However, when the submarine needs to dive, it releases a vent in the ballast tanks that causes the surrounding water to rush in. It works like this: when the submarine is above the surface of the water, the ballast tanks are filled with air, which means that the overall density of the submarine is less than the water it displaces. A submarine consists of ballast tanks (and trim tanks too, in some models) that can be filled by either water or air according to navigational requirements.īallast tanks are located at different positions on different models of submarines In order to control the buoyant force acting on it, a submarine fills/empties itself with the surrounding water to dive/resurface. While most boats and vessels don’t dare to mess with this equilibrium, since it keeps them afloat, submarines manipulate this effect on purpose. If the weight of water displaced by an object is equal to its own weight, then it floats otherwise, it sinks. While messing with this force can have disastrous consequences, the ability to control it can be highly advantageous. Before we discuss how submarines break the surface and go underwater, let’s do a quick recap of an important physical phenomenon of water that you surely studied at some point in a science class: buoyancy.īuoyancy is basically an upward force that keeps everything from wooden planks to gigantic vessels from sinking.
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