What do you know about submarines?

No, I don't think submarines can just parade like fish, they should be able to parade like earthworms in the water and in the ground.

There are submarines because the toilet sank!

The displacement of the Typhoon was 48,000 tons, and my friends and I were stunned, larger than the Charles de Gaulle aircraft carrier.

Throwing garbage is done with torpedo tubes, which is a firing exercise.

The first submarines were powered by hand-cranked propellers.

The submarine is the safest boat because it is not affected by storms.

Submarines are able to explore the underwater world, and their role in military divisions is very large.

First of all, the submarine is based on the buoyancy of the water, and then comes to solve it for us, so it is very unpopular.

The trivia of submarines is that they can't spin underneath the submarine, because it's particularly dangerous.

Submarines operate in the water according to the buoyancy of the water, and I think the submarine is a very great invention.

If you are a submarine, you can't stand around the ship, because it's easy to fall like that.

Although there is no open flame on the submarine, the submarine has a stable power supply, and can use an electric stove and oven, as well as a microwave oven.

In a state of emergency combat readiness, eat canned food at room temperature. It can be eaten without heating, such as compressed biscuits and cans, which are all standing dry food for naval submariners.

If you have a submarine, it will be more dangerous, but if you sit around, the speed is relatively high, and the waves are more concentrated.

Third, the design of the two is different:

1. The design of the Nautilus: The Nautilus's hull is made of steel plates, and the ratio of the density of steel to the density of seawater is ten to seven to eight. The first hull was at least five centimeters thick and weighed 394.96 tons.

The second inner shell, the keel, was fifty centimeters high and twenty-five centimeters wide, and weighed only sixty-two tons. The weight of the machinery, the ship engine, the various ancillary implements and fixtures, the various wall panels and timber inside, and the three hundred and ninety-four .96 tons on them, together with the three hundred and ninety-six tons, are a total weight of 1,492.13 tons.

2. Design of submarines: R&D requires a high degree of and comprehensive industrial capacity, and only a few countries are currently able to design and produce them on their own. In particular, ballistic missile nuclear submarines are a key pole of the nuclear triad.

Submarines were also early stealth vehicles. The noise of a submarine can be "drowned" in the vast ocean background noise when it is reduced to about 90 decibels, which is not detectable by modern sonar.

<> "How are submarines classified?".

There are several main ways to classify military submarines:

1. Classification according to the size of the submarine.

It can be divided into large submarines (displacement of more than 2,000 tons), medium submarines (displacement of 600-2,000 tons), small submarines (100,600 tons) and pocket submarines (displacement of less than 100 tons). Submarines have two measures of displacement, one is the floating displacement and the other is the submersible displacement. All of the above refers to the floating displacement.

2. Classification according to the power mode of the submarine.

It can be divided into conventionally powered submarines and nuclear-powered submarines. Conventionally powered submarines are driven by diesel engines, batteries, and electric motors, also known as diesel-electric submarines. When sailing on the surface, the diesel engine is used as power and the battery is charged, and when diving, the battery is used to power the electric motor to drive the submarine to sail.

Nuclear submarines use high-pressure steam generated by nuclear reactors to propel steam turbines to drive the submarine to navigate. Because the nuclear power plant does not rely on air, the nuclear submarine can dive underwater for a long time without going afloat. AIP-powered submarines are powered by Stirling engines, need to bring their own oxygen tanks, and still need to retain diesel-electric propulsion, so Li Jian can only belong to the category of conventional submarines.

3. Classification according to the combat mission of the submarine.

It can be divided into attack submarines and strategic ballistic missile submarines. An attack submarine is a submarine that mainly uses torpedoes or cruise missiles as its main combat mission to hunt and kill enemy surface ships, boats and underwater submarines. Strategic ballistic missile submarines are submarines that take strategic ballistic missiles as their main combat mission to attack the enemy's land-based strategic targets, and most of them are nuclear submarines, such as the "Ohio" class strategic ballistic missile nuclear submarines of the United States.

4. Classification according to the hull structure of the submarine.

It can be divided into single-hull submarines, double-hull submarines and some double-hull submarines. Single-hull submarines have only one layer of pressure-resistant hulls that withstand water pressure, and ballast tanks are inside or front and behind the pressure-resistant hulls. Double-hull submarines are designed with an additional hull in addition to the pressure-resistant shell.

The housing itself is not subjected to pressure. The ballast tank is between the inner casings. Generally speaking, coastal defense mini-submarines that focus on speed in and out of the water are mostly single-hull submarines, and double-hull submarines are more suitable for ocean-going navigation.

In order to ensure high speed, nuclear submarines and advanced conventional submarines use a teardrop-shaped hull and a partial double-hull structure.

5. It can also be divided into unmanned submarines and manned submarines.

Unmanned submarines, in fact, are robots operating in the sea. As an underwater cutting-edge **, it is increasingly favored by countries around the world, and its development is very rapid, especially the breakthrough and application of key technologies such as intelligence, which will greatly change the battlefield of the sea without disturbance.

The scientific mysteries of the submarine complex:

There are some compartments on the submarine known as "water tanks". When the submarine needs to sink, the valve is opened and seawater is injected into the water tank, so that the weight of the submarine gradually increases and sinks. When it is necessary to keep the submarine at a certain depth in the water, it is only necessary to fill the tank with the appropriate amount of seawater.

If the submarine needs to float, a large amount of compressed air is injected into the tank by a machine, and the seawater in the tank is discharged, reducing the weight of the boat, and the submarine will quickly surface.

This is actually an application of Archimedes' principle. An object immersed in a liquid experiences an upward buoyant force equal to the gravitational force expelled by the liquid from which the object is displaced. Therefore, the amount of water stored in the water tank is an important factor for the submarine to float, sink and maintain depth.