Shen Wanqing said in surprise: "What did you say?" Won't our Beijing ship even be able to deal with the enemy's backward submarines? ”

Lin Yuan said: "Weapons and equipment, there has never been absolute advanced and backward, everything is accompanied by the continuous transformation of battlefield conditions, strong can become weak, weak can also become stronger, underwater weapons are different from other weapons, when the submarine is underwater, because there is a huge body of water in the ocean as a cover, so it is not easy for the other party to find it." "Although we have very advanced active sonar, but the situation in the ocean is very complicated, the temperature of the seawater, salinity and other components often change, they can have a great impact on the sound wave detection, for example, the 'afternoon effect', this is an interesting phenomenon in marine acoustics, in the early days of sonar, people found that in the afternoon active sonar can not receive echoes."

"This phenomenon has plagued people for a long time, and some people even think that this is evidence of the existence of supernatural phenomena, and it was not until later that marine acoustics developed to a certain extent that this mystery was solved, it turned out that when sound waves propagated in seawater, refraction would occur between seawater at different temperatures, and in the afternoon, seawater had been irradiated by sunlight for a period of time, so the temperature of seawater rose, and a temperature layer appeared between seawater at different depths."

"When the sound wave is emitted, it is refracted between different temperature layers, and is refracted to the bottom of the water in an arc, in this process, the energy of the sound wave is constantly consumed, and it is lost after the last wave, so people will not receive any echoes, and the afternoon effect is just an ordinary one of the marine acoustic effects, and there are many wonderful properties, and human beings have not been able to explain it clearly."

Lin Yuan continued: "Therefore, the difficulty of sonar detection is very great, and the accident is very large, and there are many accidents that may occur, 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, and we were ordered to go to monitor, and the process was very smooth, but when the exercises between Japan and the United States were about to end, one of our old submarines suddenly broke down and could only rise to the surface. ”

"When the submarine surfaced, it was found that a U.S. Ticonderoga-class cruiser was less than five nautical miles northeast, five nautical miles! The people on the submarine can even see the faces of the people on the American warship with optical detection devices! Before that, our submarine did not detect the American cruiser at all, and the American cruiser did not detect us. ”

Shen Wanqing asked, "How do you know that the U.S. cruiser didn't find you?" ”

Lin Yuanha smiled and said: "The cat and mouse game of submarines and warships, when we were in the East China Sea, we often played with the United States and Japan, sometimes we caught them, sometimes they caught us, this game is usually like this, at the beginning both sides do not turn on active sonar, with passive sonar to find each other, once the other party shows clues, the other side will turn on active sonar." ”

"When the sonar is working, there are two modes of search and tracking, in search mode, the sound wave is emitted in a wide range, and the target is returned, and the beam will not be concentrated to track a target, when a suspicious target is found, the sonar will switch to the tracking mode, at this time, the sound wave will be emitted to the target in order to obtain more information about the suspicious target, and then through the servo control device, to ensure that the beam always follows the target."

"After the enemy switches to tracking mode, our sonar will detect their sound waves and send out an alarm signal, and in this case, we didn't receive the alarm signal at all, so the enemy didn't spot us, which shows how difficult it is to find a submarine."

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 conventional submarines to Taiwan, and my country immediately recalled the ambassador to the Netherlands, and downgraded the embassy to an agency, you should be able to see how many submarines there are." ”

Shen Wanqing said: "Since the submarine is so powerful, why don't we build it?" ”

Lin Yuan said: "Who said we won't build it, of course we have to build it, don't worry, as soon as the warship project is established, we will set up a project for the submarine!" ”

At this moment, Wilhelm II came over and smiled: "What are you talking about?" We got to the place and the stuff inside was even more interesting. ”

Lin Yuan found that the group had come to a room, and Wilhelm II walked in with Lin Yuan, only to see that it was full of all kinds of shelves, and there were cannonballs on the shelves!

Lin Yuan couldn't help but feel excited when he looked at them, all he saw just now was the fire control system, and now he finally saw the real weapon system.

Lin Yuan thought to himself: "It's not interesting to look at the appearance of a cannonball, if you want to see it, you have to look at the content inside." So Lin Yuan deliberately said disdainfully: "What's wrong with these shells?" Is there anything special about it? ”

Wilhelm II smiled and said, "Of course there is something unusual, does Mr. Lin Yuan know what the shells of the Dao Dao Navy have?" ”

Lin Yuan remembered the conversation with that cadet at the Naval Officer Academy, so he said: "Naval artillery shells are nothing more than two kinds, one uses explosions to kill and injure the enemy, and the other relies on kinetic energy to penetrate the enemy's armor!" Could there be an exception to these shells? ”

Wilhelm II laughed and said, "You are right, but there is still a difference between this cannonball and the cannonball. As he spoke, he walked up to a cannonball, pointed at it and said, "Look at this cannonball, have you ever seen it?" ”

Lin Yuan approached the cannonball, and saw that the cannonball was only a little more slender than the ordinary cannonball, and the body and tail were more in line with the shape of the streamline, but this cannonball had something unusual in shape, that is, the head of the cannonball, the head of the cannonball was not a sharp shape, 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's an armor-piercing shell." ”

Kaiser Wilhelm II laughed and said, "You see that its head is so blunt, how can it be an armor-piercing bullet?" Wilhelm II called a waiter beside him, pointed at him and said to Lin Yuan: "This person is my groom, he can only feed horses, we can ask him, is it a sharp thing that is easy to penetrate other things, or a blunt thing is easy to penetrate other things?" ”

The groom replied respectfully, "Of course it is something that is sharp and easy to penetrate something else!" ”

Wilhelm II laughed and said, "Do you hear me, my groom knows that sharp things can easily penetrate other things, how can you say that it is an armor-piercing bullet?" ”

Lin Yuan said with a smile: "I know that you are deliberately testing me, people with a little knowledge of ballistics know that the sharp armor-piercing projectile on the head is easy to deflect when hitting the armor, which makes the shell bounce, and the sharp shell on the head is easy to break, but the blunt armor-piercing projectile is more powerful." ”

Wilhelm II smiled and nodded, walked to the side, and was just about to open a box to show Lin Yuan what was inside, but was stopped by a person, Lin Yuan's heart moved, and thought, "What's in that box?" Can't even Wilhelm II move? ”