Getting out of the car, Tasnim looked at the submarine almost directly.

Elongated droplet line with conical tail, front shell rudder and tail cross tail operating surface layout, with 4 tail rudders, single shaft and single oar.

Since there is no need to sail on the water, the submarine is completely designed with high underwater speed, and it can be completely seen from the appearance of the hull that only the use of nuclear reactors can ensure the unlimited underwater endurance of the submarine, which is what submariners hope to have the most!

Broadside number 403, this is already an improved Type 091 nuclear submarine.

Continuing to walk forward, Tasnim saw that the surface of the hull did not seem to be steel, and his eyes immediately showed surprise.

"Has the surface of this submarine been laid with silencing tiles?" Tasnim said.

Silencing tiles! If you want to find the enemy, you must have an efficient sonar, and if you want to avoid being discovered by the enemy, you need to have the means to reduce your own noise.

All the mechanical equipment is placed on the shock absorbing seat, using advanced propellers and other means, one of which is very important, is to lay silencing tiles!

On the surface of the submarine, a layer of underwater sound-absorbing material is used, which is almost always elastic, and when the sound waves pass through, the elastic sound-absorbing material will deform, and it will take a process to restore the original shape. In this process, the deformation lags behind the change in stress, so that the sound energy is converted into heat energy and lost. In this way, you can reduce the sound of your own submarine, and at the same time, when the opponent's active sonar comes to detect, it can also reduce the echo of the active sonar and reduce the detection range.

Because the sound-absorbing material is laid out in pieces, like tiles for the roof of a house. Therefore, this sound-absorbing material is figuratively called a sound-absorbing tile.

In World War II, Germany began to develop the technology of silencing tiles. In the Cold War, the United States and the Soviet Union competed for hegemony, each developed its own technology for silencing tiles, after the seventies. The submarines of both sides began to lay their own silencing tiles.

In addition to the United States and the Soviet Union, the rest of the United Kingdom, France and other countries are also developing their own silencing tile technology, after all, this thing is a secret technology of various countries.

China's technology is very backward, which is also an area of concern for President Mhammad, if the submarine is too noisy, it will be the same with or without.

Right now. Seeing that the surface of the submarine is laid with sound-absorbing tiles, it shows that the submarine still attaches great importance to its own noise level.

"Yes, the first two ships did not use silencing tiles, and since our third one, there have been such silencing tiles." The captain of the submarine who came to receive him, who was in his forties because he had been underwater for a long time, was different from other soldiers. Oily and fair skin, at this time. He looked at the Pakistani in front of him and said quietly: "It's just that there are still some problems with our silencing tiles that have not been solved. It needs to be re-laid. ”

In front of Pakistani friends, such a secret is not a secret.

Silencing tile technology, in addition to being able to achieve sound reduction, is also very complicated to lay, and the process is not in place. It is easy to cause shedding, which is a problem encountered by both the United States and the Soviet Union.

You can look at the pictures of the submarines of the Soviets, and when they come to the surface, you can often see that there is something like a scar on the surface of the submarine, that is, the sound-absorbing tiles on it have fallen off. This problem was not completely solved until the collapse of the Soviet Union, let alone the current China.

It's not terrible to fall off, just come back and re-paste it.

"Please get on board." Huaxia's submarine captain said.

Unlike other warships, submarines do not have steps here, and they climb down the ladder directly from the front hatch.

Several Pakistani naval officers followed Captain Huaxia with great interest and watched everything inside.

"Up front is the torpedo compartment." Since it came from the front, it was natural to look at the equipment in front first.

Although the structure of a conventionally powered submarine is not the same as that of a nuclear submarine, one thing is the same, that is, the capital of the ship is a torpedo compartment and a sonar compartment.

In general, the upper half is a torpedo tube, the lower half is an array of sonars, and now, having walked into the torpedo compartment, Tasnim frowned a little.

Loading is still carried out manually, and even manual equipment such as gourds can be seen, so the filling efficiency is undoubtedly very low. Now, Pakistan's two TR-1700s have achieved automatic torpedo loading.

For a long time, China has faced a military blockade from the West, and it is impossible to obtain the advanced technology of the West, and submarines are only the old R-class submarines in China, so many technologies are backward, and torpedo loading like this, in the case of manual operation, obviously will not be equipped with advanced automatic loading equipment. In Huaxia, the labor cost is very low.

It seems that even if the technology of such submarines is introduced, it will have to be improved with Western equipment!

In the torpedo compartment, you can also see some sleepers, and the space in the submarine is limited, so it is very comfortable to sleep in empty places like these, saving you from squeezing hot bunks.

When the space inside the submarine is insufficient, the sleeping place of the personnel will be stretched, so that not everyone has a fixed bed to sleep, many times it is two people, or even three people, to be able to have a sleeper. If there are three people in a shift, every eight hours of shifts, there is always someone sleeping on the sleeper, so it is called a hot berth.

It also takes a kind of courage to sleep on these torpedoes, which can explode at any time.

"The middle is the command area." The captain continued to take the personnel to visit, the hatches are not big, each one is round, you have to raise your legs, you can step over, after all, there are many dangers underwater, in case of an accident, such as a compartment flooding, it is necessary to close the hatch in a short period of time, isolate this compartment, to prevent the submarine from never being able to float because of the lack of buoyancy in the reserve.

Submariners must have a slender build, and if they are a big fat man, it will seriously affect the passage.

Looking at the side of the aisle, there are all kinds of pipes, all kinds of switches, all kinds of meters, Hussein, the eagle in the sky, the eyes can't see it, each one is very interesting.

Tasnim, on the other hand, is observing the internal structure of the submarine to see if it is reasonable.

The central part is where the noise is minimal, the sonar room, the command room, etc. are all here.

If it were a conventional submarine, the lower half would be gone, it would be occupied by batteries, and here, obviously, it is much wider.

When you open the door to the sonar room, you can see the iron console, an old-fashioned screen, and the huge earplugs.

"Is there only one sonar?" Tasnim asked.

"Yes, our submarine uses a domestic DUUX-5 passive sonar." The captain said.

In terms of electronic technology, there is a big gap between China and the West, and when it was developing nuclear submarines, many of the equipment could not be equipped in a timely manner, and these submarines were also upgraded in batches.

Tasnim couldn't help but shake his head: "It's best to have a towed body sonar to be able to better detect the enemy." ”

Submarines are underwater, mainly by listening to sound, and this sonar, the more base array units, the farther they are distributed, the easier it is to find the target.

Helicopter sonar buoys are cast in order to form a vast base array, and for submarines, in addition to using the sonar at the bow, they can also be equipped with towed body sonar, which can be towed far behind the submarine, which can increase the detection distance exponentially.

"We also want to have a towed body sonar, but..."The captain of Huaxia also smiled wryly.

Good stuff, who wouldn't want to have? The problem is, it can't be made in China! In fact, the first set of towed body sonar of the Chinese Navy, which was only equipped on the Luhu-class destroyer, used French goods.

When he walked into the conning tower, the equipment inside, Tasnim felt that it was not as advanced as his own diesel-electric submarine, and he couldn't help but secretly think in his heart, if it was really introduced, I am afraid that it would have to be replaced with Western electronic equipment on a large scale!

Continue to the rear compartment, that is, the power compartment, when the use of nuclear power, the submarine can almost endlessly sail underwater, the specific self-sustaining power, that depends on the endurance level of the crew, when the Americans carried out an underwater voyage around the world, when they returned to their home port, the crew inside, almost carried out.

In submarines, the engineers are the hardest, the hottest places are, and, in order to maintain the power system, the engineers are almost always shirtless and covered in oil.

And here, due to the change to nuclear power, the work of the engineer is also very easy, it is nothing more than to monitor the nuclear reactor to see if it is operating normally, to see if the steam pressure is normal, whether the steam turbine is working normally, and if necessary, to start the emergency unit, that's it.

Of course, they are under the most pressure, after all, this is a nuclear reactor! In the event of a failure, such as a nuclear leak, they will bear the brunt of the problem, even risking their lives to repair it.

The huge steam turbine unit is placed on the shock-absorbing base, and the bandaging of various pipelines is very tight, and in terms of machinery, Tasnim really can't find any fault, that is, the electronic equipment is too backward!

"We're using a pressurized water reactor with 90 megawatts of power." The captain said: "It can propel our nuclear submarine to a speed of more than twenty-five knots." ”

All the charm of the nuclear submarine is on this nuclear reactor, which provides a powerful energy source, once the diesel-electric submarine dives, it can't even eat a hot meal, and must save all the electricity, while the nuclear submarine can continue to use the electric stove to make hot food. The oxygen in the submarine does not rely on the action of chemical devices, and it can be produced by direct electrolysis of water. (To be continued......)