Open an aircraft carrier to fight against Japan

On the Huofeng ship, when everyone learned that the battleship had wiped out all five Japanese submarines, they immediately cheered, but Abe Ichiro, who was sitting on the side, stared fiercely at the cheering crowd. He would really pounce on Yu Feng's side and beat Yu Feng hard.

At this moment, the sonar captain sent a message: "Report to the captain, behind the five submarines we hit, there are four more submarine sound signals,"

Yu Feng was overjoyed and thought: "There are four more, so we have encountered ten Japanese submarines at once. If we sink them all, the victory will be quite big." Yu Feng immediately said: "Track and calculate immediately. Target position, the torpedo room is ready to launch the torpedo, "

The sonar chief said in a panic: "It is impossible to track and measure the target position, the interference is too strong,"

Yu Feng immediately asked: "Interference, what interference?"

The sonar chief said: "I don't know, the echo is very messy, it must have suffered serious interference,"

Yu Feng thought to himself: "Could it be that the Japanese army is equipped with underwater acoustic countermeasures?"

It turned out that the Japanese submarines were divided into two echelons, with five ships in each echelon. The five ships in the first echelon were all sunk except for the INO. Of the five ships in the second echelon, except for the one that was accidentally hit and sunk by the first torpedo, there were still four ships left.

The numbers of these four submarines are thirteen to sixteen, and the reason why these four submarines were not discovered by Lin Yuan's warship is not that they used underwater acoustic countermeasure equipment, but that in the attack just now, the torpedo exploded, the submarine The explosion produced a large amount of gas, and the gas inside the submarine also leaked out. These gases entered the water and formed bubbles. The bubbles rose rapidly in the water, and invisibly played the role of air curtain bombs.

Air curtain bombs are commonly used underwater acoustic countermeasure equipment in Lin Yuan's era, and they were also the first underwater acoustic countermeasure equipment invented in Lin Yuan's era. This air curtain bomb is composed of chemicals that can generate a large number of bubbles. After the explosion, it can form a large number of Bubbles, these bubbles have been pre-designed, some are large in size, some are small in size, the larger bubbles rise faster, and the smaller bubbles rise slower, thus forming a "bubble wall" in the water.

This "bubble wall" can not only reflect the quotation marks of active sonar, making torpedoes mistakenly think that the "bubble wall" is the target, but also can cover the sounds made by submarines and ships themselves, making passive sonar invisible, so that the enemy's torpedoes Unable to hit real targets.

The torpedoes of Lin Yuan's troops were disturbed by the air bubbles, and either hit the wall of the air bubbles or deviated from the target, so the submarines of the second echelon of the Japanese army were spared, and the existence of the air bubbles also interfered with the towed array sonar on Lin Yuan's warship , So the sonar commander was unable to find the Japanese submarine based on the sonar signal.

Yu Feng thought in his heart: "Regardless of whether the Japanese army is equipped with underwater acoustic countermeasures or not, I shouldn't take risks. How about I let the warship sail a little farther away to prepare for the Japanese torpedo attack? Our unmanned submersible vehicle speeded up and rushed to the vicinity of the Japanese submarine team for reconnaissance as soon as possible.

Thinking of this, Yu Feng issued an order, and the unmanned submersible immediately accelerated, arrived near the Japanese submarine team, and sent the remaining Japanese submarine's position, speed, etc. to the control room. Although the sonar soldier in the middle heard the sound of the unmanned submersible, he thought it was a noise, so he ignored it.

The captains of the remaining four Japanese submarines understood after the sonar reports that they heard explosions one after another: their submarine was attacked by warships of Lin Yuan’s troops. They were not as smart as Xiaoshan Shiji. Thinking of the way to turn and disperse to escape, but thought of the idea of ​​fighting to the death with Lin Yuan's warship.

The captain of the No. 13 submarine said loudly: "We were discovered by the warships of Lin Yuan's army. The speed of the submarine is much slower than that of the surface ships, so we have no hope of escaping. The only thing we can do is to report Even if the warships of Lin Yuan's army launch an attack, even if they die, they must tell the Chinese people that our warriors of the Japanese Empire would rather die than die."

The captain then issued an order: "Empty the water in the fast diving compartment, float up to the height of the periscope, the torpedo leader, use the periscope to detect, and attack quickly as soon as the target is found,"

The torpedo chief replied loudly: "Yes," and then he came to the front of the periscope and grabbed the periscope. At this time, the submarine began to float up slowly. Reports were made to both warships.

After receiving the message from the submersible, the sonar captain reported to Yu Feng: "Captain, we have received a message from the submersible,"

Yu Feng hurriedly asked, "Is this the location of the Japanese submarine?"

"It should be, but we're not sure," said the sonar chief.

Yu Feng asked in surprise: "I'm not sure, why can't I be sure?"

The sonar director said: "The sound waves used for communication are more complicated than those used for reconnaissance. The frequency and waveform of the sound waves need to be adjusted before launching to load information. However, the sound waves are attenuated by sea water during the propagation process. The information loaded in the waveform cannot be read out for a while,"

Yu Feng said: "Can't the towed array sonar determine the location of the Japanese submarine team?"

The sonar chief replied: "The interference we have received is too strong, and we are still unable to detect the position of the Japanese submarine. Submersibles are our only hope."

Yu Feng thought for a while and said: "Increase the listening time for the submersible's sound waves, and let me know as soon as you have the result." Sonar is the same as radar. When the received information is inaccurate, increasing the receiving time will make the information change. To be precise, when the two battleships were listening to the sonar news, the submarine No. 13 surfaced to a depth of ten meters, and the torpedo issued various orders in a loud voice, and quickly completed the preparations before the torpedo launch. Said loudly: "Report to the captain, the torpedo is ready,"

The captain ordered: "Four salvos," and the torpedo commander immediately ordered the launcher: "Four salvos," and the launcher in the bow torpedo cabin immediately pressed the launch button, and the four torpedoes were fired together, and the launcher immediately Said: "The torpedo launch was successful,"

The torpedo commander immediately ordered: "Close the valve of the launch tube to the sea, and open the weight adjustment valve." A torpedo on a Japanese submarine weighed [-] kilograms. After launching four torpedoes, the weight of the submarine was reduced by more than three tons. If the weight of more than three tons is added, the submarine will tilt, so the submarine needs to open the adjustment valve to introduce seawater into the submarine to balance the weight of the four torpedoes launched.

The torpedo moving at high speed was quickly heard by the sonar on Lin Yuan's warship, and the sonar captain immediately reported: "Captain, the torpedo target is found, and the speed is [-] knots."

Yu Feng thought to himself: "The Japanese submarine launched a torpedo, our anti-torpedo system will be useful," he secretly glanced at Abe Ichiro while thinking, and saw that he was snickering, Yu Feng thought to himself : "Just laugh, you'll cry soon,"