The waveform chart and two sets of data on the screen were pressed, and Hua Jianfeng didn't sound +7

"It's still impossible to calculate the distance." Le Jiacheng raised his head and sighed, "The noise is too weak, and it can only be concluded that the distance is more than 70 kilometers."

Hua Jianfeng nodded, not disappointed

Because the distance is too far and the noise intensity is lower than the minimum value required for automatic analysis by computers, Hua Jianfeng asked Le Jiacheng to manually control the fire control computer for analysis

In order to maximize the range of passive sonar, the "Swordfish" turned to the 175 and 210 degrees heading, facing the side to two noise sources. The result is still not ideal. The maximum range of passive sonar of the "Swordfish" is 70 kilometers, so Le Jiacheng can only conclude that the noise source is 70 kilometers away.

"Do you want to do it again?"

"There is no need for this." Hua Jianfeng shook his head and asked at the sonar, "Have the noise intensity increased?"

"Not very obvious, within the lowest noise range of 'Virginia'"

Because the construction process of each submarine is different, there will always be slight differences, so the minimum noise of a first-class submarine is not a fixed value, but a range The minimum noise of a "Virginia"-class attack nuclear submarine measured by the Republic's Navy is between 962,973 Bays

Hua Jianfeng pondered for a while and said, "I don't believe that the Americans can keep calm. Let's wait patiently."

Le Jiacheng did not object, and there was no other good way to wait for it at this time

In order to "attract" the US submarines, the Swordfish retracted the towed sonar after turning, and ran for about 2 minutes at a speed of 24 knots. In this case, the Swordfish made more than 104 Bay. The Swordfish made a ground noise. The Virginia-class attack nuclear submarine was very advanced and it was impossible to hear the sound of the Swordfish made a ground sound.

"Maybe Du Xinghua and Liu Haifeng both heard the noise we made."

"They?" Le Jiacheng smiled and shook his head. "Maybe they are waiting for an opportunity hundreds of kilometers away."

"Is it possible?" Hua Jianfeng glanced at his partner. "You don't know them, but I know them very well. Du Xinghua, this kid, was admitted to the submarine academy with me, graduated together, and served in the submarine force together. As a result, he almost missed many opportunities every time he was promoted. He was lucky enough to be more than me.

If he had a chance, he would not even let go of the US aircraft carrier battle group Liu Haifeng was two years behind us. But he was not a little surprised that he boasted last year that Haikou would surpass Du Xinghua within two years and become the number one ace captain of the Republic within three years. Do you think these two guys will wait for the rabbit?"

“The question is, can they arrive before us?”

"Why can't it?" Hua Jianfeng shook his head with a smile, "In addition to the twelve vertically launched anti-ship missiles, the 095 can carry 38 torpedoes and missiles. In the first round of battle, two 095 ambushed the third fleet and did not consume much ammunition. I don't have to return to the base. I bet that they have been waiting here for several days and have long been eyeing the two US submarines, just waiting for their opponents to enter the war zone!"

"If they were nearby, we should have noticed it, right?"

"You underestimate their determination to achieve the results," Hua Jianfeng smiled and said, "Before Type 095, the 'Longxiang Battery' was replaced by ordinary batteries. Even if the nuclear reactor is shut down, it can still sail underwater for hundreds of kilometers. If it stops, it uses batteries to power life maintenance systems such as oxygen generators. After staying under the sea for ten days and half a month, they will definitely shut down the nuclear reactor, try to reduce noise, and wait for the Americans to come to the door."

"It's been 7 days, isn't this crazy?"

Le Jiacheng was shocked that the nuclear submarine was not unable to shut down the nuclear reactor, but it required a lot of electricity when restarting the nuclear reactor. 6 Before, the "Calacht Squid" was ambushed by US troops in the Indian Ocean and was injured by torpedoes. He had to shut down the nuclear reactor and use batteries to provide electricity to necessary equipment. As a result, he had to restart the nuclear reactor after only staying underwater for more than 20 hours.

2095 rushed over after the first round of conflict, and had been here for several days

Even if the "Longxiang battery" is much better than ordinary batteries, when providing electricity to life maintenance systems, fire control systems and passive detection systems, it will last for a few days at most. Because there has not been any test, no one can say exactly how many days it can last.

"Captain!"

Hearing the long scream of sonar, Hua Jianfeng and Le Jiacheng turned their heads at the same time

The sonar tapped the screen in front of him, looking very excited

Hua Jianfeng took a few big strides and immediately showed joy when he saw the set of numbers on the screen.

974, the noise intensity from the 120-degree direction exceeded the lowest noise of the "Virginia"-class attack nuclear submarine, and the noise intensity from the 85-degree direction also reached 974 Bays.

"Don't be anxious first, continue to observe." Hua Jianfeng grabbed the long shoulder of sonar, "Maybe the two 'Virginia's' have failed and their performance has been reduced."

The sonar whispered: "I think they are approaching here."

Hua Jianfeng nodded, and did not rush to make a judgment

Without giving instructions, Le Jiacheng re-measures the distance of the noise source through manual operation.

Time passed by minute by minute, and the atmosphere in the command center gradually became tense

After about 5 minutes, the intensity of the two noise sources reached 97.

"Family!" Hua Jianfeng turned around and looked at his deputy

"Predicting" Le Jiacheng took a deep breath, inputting data to the fire control computer, and staring at the tactical screen without turning around. "It's out, the distance upward of 120 is 67, the distance in the 85 is 66, and it has just entered the range of passive sonar."

"Fighting state!" Hua Jianfeng quickly returned to the command post, "check the torpedo status and calculate the fire control data as soon as possible."

The officers and soldiers in the command center became busy immediately, and the officers and soldiers of the boat also became busy.

"Torpedo inspection is completed, in the best condition"

"The noise is too weak to obtain fire control data"

Hua Jianfeng frowned slightly, glanced at the data on the tactical screen, and said, "Tail 105, depth 240, speed 6"

Le Jiacheng hesitated for a moment and nodded to the officer in charge of the helm.

"Lao Hua, let's meet you, will you..."

"Don't worry, I won't cross the border of the war zone," Hua Jianfeng smiled coldly and said, "We will wait at the door and try to lock in the target as soon as possible. As long as the US submarine enters the war zone, we will use torpedoes to entertain the dog days."

Seeing that Hua Jianfeng was determined, Le Jiacheng couldn't say anything

"The No. 1,2,34 torpedo launch tubes are injected in advance," Hua Jianfeng said to the gun officer, "Be prepared for launch in advance, and after issuing an attack order, be sure to launch the torpedo at the fastest speed."

"The torpedo launch tube is injected with water, and the combat units are ready"

Hearing the slight sound of water pouring into the torpedo launcher, Hua Jianfeng glanced at the noise detector

102 Bei, will the whereabouts of the "Swordfish" be exposed?

When Hua Jianfeng was worried, Le Jiacheng did the actual work and inputted a string of data into the fire control computer. The calculation results appeared on the screen.

"It shouldn't be heard by the US military." Le Jiacheng lowered his voice and said, "Unless there is a third US submarine within 35,000 meters."

Hua Jianfeng nodded, and he also saw the calculation results that appeared on the screen.

In addition to its own performance, the detection distance of passive sonar is mainly determined by three factors: one is the target noise intensity, the second is the temperature, salinity, current direction and speed of the surrounding sea water, and the third is the intensity of its own interference noise.

With these three sets of data, you can determine whether the enemy will hear the sound of the "Swordfish"

In the next few dozen minutes, Hua Jianfeng was paying attention to the noise intensity value of the target 2. When he could measure the distance of the enemy boat and roughly grasp the characteristic noise of the enemy boat, he could roughly judge the navigation speed of the enemy boat by the noise intensity emitted by the enemy boat, and thus infer the tactical intention of the enemy boat.

If the enemy boat is within a quiet speed, the enemy boat will not be able to attack actively. Otherwise, the enemy boat is looking for fighter jets

"Captain, fire control data!"

Hearing the sonar's report, Hua Jianfeng immediately glanced at the value on the screen, 982 decibels!

If those 2 "Virginia"-class attack nuclear submarines did not have mechanical failures and were in normal use, the navigation speed at this time would definitely be above 10 knots!

This is not a combat patrol, but a capture of ambush positions

"Distance 54 and 52, target depth 210 and 200, and heading 235215." Le Jiacheng hesitated for a moment, "2 submarines are moving towards our sounding location, preparing to encircle from both sides, and definitely want to siege us!"

Hua Jianfeng nodded and said, "Target speed?"

"It's still calculating" Le Jiacheng wiped the sweat from his forehead, "It's too far, the torpedo hit rate will not be very high."

"I know" Hua Jianfeng said, and called out the war zone chart and marked the war zone range with a red line. "The course turns to 15 degrees, sail 4, keep the depth

”

Le Jiacheng's brow jumped a few times, and set the fire control computer to automatically calculate the fire control parameter mode

"The target speed of No. 1 is 12, and the target speed of No. 2 is 13 long, "far exceeding the quiet speed of 'Virginia', and the tactical intentions are very obvious."

"Reset the route" Hua Jianfeng signaled his deputy to master the route himself. "When we turn around, we will calculate the fire control parameters again, and then aim at the 2 US submarines. As long as the Americans dare to come, we will never show mercy."

Le Jiacheng nodded and walked behind the officer at the helm

Hua Jianfeng took a deep breath. It was not a question of whether to fight or not, but whether the Americans had the courage.

Time flies quickly. About 30 minutes later, the "Swordfish" turned 180 degrees and aimed the left hull at two US submarines. The Guns and Cannon Corps calculated the fire control data again instead of the deputy captain.

After issuing the command to input fire control data for torpedoes, Hua Jianfeng brought the "Swordfish" back to the top.

"No. 1, 3 torpedo autonomous attack mode, 24 torpedo line guide mode..."

"Captain, new situation!"

Hua Jianfeng was stunned and looked at the sonar

"The target disappeared!"

"What!?"

The information is displayed on the tactical screen. The 2 "Virginia" that was still under the surveillance of "Swordfish" was about to cross the Okinawa Trough! (To be continued,)
Chapter completed!