Open an aircraft carrier to fight against Japan

Shen Wanqing said in surprise: "What did you say? Could it be that our Beijing ship can't even deal with the enemy's backward submarine?"

Lin Yuan said: "Weapons and equipment have never been absolutely advanced or backward. Everything is constantly changing with the battlefield conditions. The strong can become weak, and the weak can also become strong. Underwater weapons are different from other weapons. When underwater, because of the huge water body of the ocean as a cover, it is not easy for the other party to find it."

"Although we have very advanced active sonar, the situation in the ocean is very complicated. The temperature, salinity and other components of the sea water often change, which can have a great impact on the sound wave detection. Take the 'afternoon effect' as an example. This It is an interesting phenomenon in ocean acoustics, in the early days of sonar, it was found that the active sonar could not receive the echo in the afternoon."

"This phenomenon has troubled people for a long time, and some people even thought it was evidence of the existence of supernatural phenomena. It was not until later that ocean acoustics developed to a certain extent that this mystery was solved. It turns out that when sound waves propagate in seawater, they are There will be refraction between the sea water, and in the afternoon, the sea water has been exposed to the sun for a period of time, so the temperature of the sea water rises, and a temperature layer appears between the sea water at different depths."

"When the sound wave is emitted, it is refracted between different temperature layers, and it is refracted to the bottom of the water in an arc. During this process, the energy of the sound wave is continuously consumed and finally lost, so people will not receive it. As far as any echo is concerned, the afternoon effect is just an ordinary ocean acoustic effect, and there are many wonderful properties that humans have not been able to explain clearly so far."

Lin Yuan went on to say: "So, sonar detection is very difficult, and the chance is very high, and there may be many accidents. I have experienced such a thing. Once, Japan and the United States conducted military exercises in the waters near the Diaoyu Islands in the East China Sea. , we were ordered to monitor, and the process went very smoothly, but at the end of the exercise between Japan and the United States, one of our old-fashioned submarines suddenly broke down and could only float to the surface."

"When the submarine surfaced, it was discovered that a U.S. Ticonderoga-class cruiser was less than five nautical miles to the northeast, five nautical miles! The people on the submarine could even see the people on board the U.S. Navy ship clearly with optical detection devices. The appearance! Prior to this, our submarines did not find this US cruiser at all, and the US cruiser also did not find us."

Shen Wanqing asked, "How do you know that the US cruiser didn't find you?"

Lin Yuan laughed and said: "The cat and mouse game of submarines and battleships, when we were in the East China Sea, we often played with the United States and Japan. Sometimes we catch them, and sometimes they catch us. This game is usually In this way, both parties do not use active sonar at the beginning, and rely on passive sonar to find each other, and once the other party reveals clues, the other party will turn on active sonar."

"The sonar has two modes of search and tracking when it is working. In the search mode, the sound waves are emitted in a wide range. When encountering a target and returning, the beam will not be concentrated to track a certain target. When a suspicious target is found, the sonar will switch to the tracking mode. At this time, the sound waves will be concentrated on the target to obtain more information about the suspicious target, and then through the servo control device, the beam will always follow the target."

"After the enemy switches to tracking mode, our sonar will detect their sound waves and then send out an alarm signal. In this incident, we did not receive an alarm signal at all, so the enemy did not find us. Illustrates the difficulty of spotting submarines."

Lin Yuan said: "I can also give you an example to prove that in our era, in 1980, the Netherlands sold two Sailfish-class attack submarines to Taiwan. Our country immediately recalled its ambassador to the Netherlands and moved the embassy to Taiwan. Downgraded to an agency, you should be able to see how many submarines there are."

Shen Wanqing said, "Since submarines are so powerful, why don't we build them?"

Lin Yuan said: "Who says we won't build it? Of course we will. Don't worry. As soon as the warship project is established, we will approve the submarine project!"

At this moment, William II came over and said with a smile: "What are you talking about? We have arrived, and the things inside are even more interesting."

It was only then that Lin Yuan realized that a group of people came to a room. William II led Lin Yuan in, and saw that the inside was filled with various shelves, and there were shells placed on the shelves!

Looking at them, Lin Yuan couldn't help feeling excited. What he saw just now was all about the fire control system, and now he finally saw the real weapon system.

Lin Yuan thought to himself: "The appearance of shells is not interesting, but the content inside." So Lin Yuan deliberately said with disdain: "What's wrong with these shells? Is there anything special about them?"

William II smiled and said, "Of course there are unusual things. Does Mr. Lin Yuan know what the navy's shells are?"

Lin Yuan remembered the conversation he had with that cadet at the Naval Academy, so he said: "Navy shells are nothing more than two types, one uses explosion to kill the enemy, and the other relies on kinetic energy to penetrate the enemy's armor! Could it be that these shells can Are there exceptions?"

William II laughed loudly and said, "You are right, but this shell is still different from the shell." As he spoke, he walked to a shell, pointed to it and said, "Look at this shell." , have you seen it?"

Lin Yuan approached the cannonball, and saw that compared with ordinary cannonballs, the cannonball was only a little slender, and its body and tail were more in line with the streamlined shape. However, the shape of this cannonball was unusual. That is the head of the cannonball. The head of this cannonball is not sharp, but very flat, similar to a round ball.

Wilhelm II asked: "Do you know what this is?"

Lin Yuan thought for a while and said, "Of course, the head of this shell is not sharp, so I think it is an armor-piercing shell."

William II laughed and said: "Look at its blunt head, how could it be an armor-piercing bullet?" William II said and called a waiter beside him, pointed at him and said to Lin Yuan: "This man is mine. The groom can only feed the horses, we can ask him, is it easier for a sharp thing to penetrate other things, or a blunt thing for other things to penetrate more easily?"

The groom replied respectfully: "Of course sharp things can easily penetrate other things!"

William II smiled and said, "Have you heard that? My groom knows that sharp objects can easily penetrate other objects. How do you say it is an armor-piercing bullet?"

Lin Yuan smiled and said: "I know you are trying to test me on purpose. Anyone with a little knowledge of ballistics knows that armor-piercing bullets with sharp heads tend to deflect when they hit the armor, causing the shells to jump and the head Sharp shells are easy to break, but blunt armor-piercing shells are more powerful."

William II nodded with a smile, walked to the side, and was about to open a box to show Lin Yuan what was inside, when he was stopped by a person, Lin Yuan's heart moved, and he thought: "What's in that box? ? Can’t even Wilhelm II move?”