Take Taobao to fight against Japan

Therefore, the attack tactics of this type of submarine are generally to use the listening device to locate the escort fleet first, then approach at high speed, use the silent speed or maximum speed to sneak into the escort area, and use sonar to shoot the torpedoes below the escort fleet, and launch them in a fan torpedoes, thereby increasing the hit probability? .

The sonar data conversion device of the XXI submarine can automatically calculate and set the torpedo shooting elements, aim the torpedo without a periscope, and launch the torpedo from a water depth of 50 meters, which increases its safety. ?

The XXI submarine is also equipped with a radar warning receiver, which can detect the opponent's anti-submarine force in the snorkel state.

These performances greatly reduce the possibility of it being discovered and sunk in front of the current anti-submarine forces, but the chances of discovering and attacking the enemy fleet are greatly increased? .

Undoubtedly, the Type XXI was the first real combat submarine with a higher speed underwater than on the surface, making it an ideal offshore attack submarine.

It is fast, easy to maneuver, highly maneuverable, simple to set depth, and small in outline, making it suitable for long-term and continuous underwater operations, with a self-sustaining force of up to 36 days at sea.

If the real submarine, the Type XXI U-boat, had been put into use a few years earlier, perhaps the anti-submarine warfare in the Atlantic would have been a different story.

XXI型潜艇设计师为瓦尔特教授，1943年开始研制，首艇1944年5月12日下水，1944年6月27日服役。

But here, someone Yang, who believed in bringing doctrine, bought 4 ships from the system mall a few months in advance and delivered them to the troops for training.

Now these three Type XXI submarines have finally come out of the mountains, and are currently cruising in the vast and incomparably vast Western Pacific battlefield, looking for fighters everywhere, waiting for the opportunity to annihilate the Japanese transport fleet and escort warships.

As for the XXI submarine production line worth 40 billion wealth points, Yang Fan can only sigh inwardly that "the money will be spent when it is spent".

Although Yang Fan is really greedy and really wants to get started, after all, this kind of submarine is a historical trend. Not only can it be used for a long time, its military technology is very useful, and it can greatly enhance your own military. technology.

However, these days, Mr. Yang has been emptied by the Worcester-class cruiser and the Messerschmitt Me262 jet fighter production line successively, and there is really no money left.

Therefore, Yang Fan can only settle for the next best thing, and spend some "small money" to get 4 spot ships first.

Well, a Type XXI submarine is worth 3000 million wealth points. Although it is not a small amount of money, it is much easier and more enjoyable to spend 40 million wealth points than 1 billion wealth points.

Chapter 1570: Sharks in the Pacific Battlefield

"Wow, this type of submarine is so cool, it's so cool!"

"Yeah, yeah, it's awesome, it's like the sky and the ground with our previous submarine, it's incomparable at all!"

"Our boss is still very good, such an advanced submarine can be obtained, awesome!"

"Brothers, the boss thinks highly of us, and distributes to us as soon as we get good things. We can't let the boss down!"

"Please don't worry, captain, the brothers will work hard to ensure that this trip will return with a full reward!"

After two or three months of training, Luo Faren and others finally got a good grasp of the performance and temperament of the Type XXI submarine. They have long been deeply infatuated with this new and powerful submarine, and they can't put it down.

With a hammer in your hand, you will naturally search for nails all over the world.

After finally surviving until now, they were finally able to drive the extremely powerful new type of submarine to go out and attack freely. Naturally, Luo Faren and others screamed with excitement, eager to make contributions and show off their operations.

Prior to this, although there were many other types of submarines in the submarine forces in Myanmar and Shandong, Yang Fan repeatedly asked the submarine forces to focus on insignificant development and not to attack without orders.

Even if they are usually ordered to go out to perform missions, it is mainly based on experience. There is no mandatory attack mission, but they are allowed to play freely and wait for the opportunity to target those Japanese transport fleets that have little protection.

This is by no means that Yang Fan wants to be used to the Japanese navy, but because of the butterfly effect in the current time and space, Japan’s radar technology has been developed a long time ago, and its radar level far exceeds that of another time and space.

The rapid development of radar technology has also greatly enhanced the anti-submarine means of the Japanese army. If there are escort warships to protect them, the success rate of the attack by the old-type submarines of the Huben Army will be very low, and their own risks will be great.

Even if he tried his best to kill a few Japanese ships, he would basically not be able to escape.

After all, these old-fashioned submarines are not real submarines at all, and they have to risk their lives every time they attack.

Especially when the opponent has anti-submarine ships, it is basically a one-shot deal to kill one thousand and lose eight hundred.

Yang Fan has never bothered to do this kind of suicide attack, not only because he knows the whole historical trend, but also the development trend of the system technology tree.

More importantly, as a modern person, Yang Fan is unable to treat every living life as a war game on the sand table, as a group of consumables that can be discarded at any time.

Therefore, Yang Fan would never allow his troops to compete with the Japanese fleet in exchange for consumption ratios when it was completely unnecessary and lacking in frontal toughness.

In fact it is.

Germany was the first country to use submarines superbly in World War II. Its wolf pack tactics caused the Allied navies to suffer a lot.

In addition to Germany, the United States is another country that has maximized the capabilities of submarines.

Because it perfectly cut off Japan's sea line of communication, it is worth mentioning that the number of officers and soldiers of the U.S. submarine force only accounted for 1.6% of the naval power, while in the protracted blockade war, its record accounted for 54%.

After the outbreak of the Pacific War, the United States had a total of 43 submarines in the Asia-Pacific region. Compared with Japan's more than 60 large submarines, these US submarines had problems such as small tonnage, insufficient endurance, and low torpedo power.

At the beginning of the war, these submarines launched 31 attacks on Japanese warships, troop carriers and cargo ships, fired 66 torpedoes, but only sank 3 cargo ships.

After the Battle of Pearl Harbor, Nimitz served as the commander of the Pacific Fleet. He was a submarine commander, so he had a deep understanding of the strategic role of submarines.

He focused on the use of submarines to destroy Japanese sea transportation lines as his main task.The specific tactic is free hunting, which is quite different from the wolf pack tactics of the German army.

Nimitz's move enabled the submarine to achieve fruitful results. In 1942 alone, the US submarine patrolled 350 times and sank 180 Japanese ships, totaling 72.5 tons.

In contrast, the Japanese Navy, although it has relatively advanced submarines, has unclear missions and has achieved very limited results.

The U.S. submarine force became more and more confident as they fought. With the assistance of the radio intelligence department, they repeatedly achieved success.

Classic battle examples include the submarine Baiyangyu sinking the Japanese submarine I-173 face-to-face, and the S-44 small submarine taking a risky attack after discovering the Japanese heavy cruiser formation and sinking the heavy cruiser Kako, etc.

By 1943, the strength of the U.S. submarine force had been greatly enhanced. Not only had the number increased by 66, but it also surpassed Japanese submarines in quality, including being equipped with surface search radars, which could attack targets that could not be observed by the naked eye in the dark and fog.

In 1943, U.S. submarines sank more than 300 Japanese warships, totaling 180 million tons, which was fatal to Japan, which needed to import everything.

U.S. submarines sank 1113 Japanese merchant ships with a total tonnage of more than 532 million tons.

As the saying goes, "The food and grass go first before the soldiers and horses are moved." Especially in naval battles, whether the transportation and supply are smooth is directly related to the outcome of the war.

In the contest on the Pacific battlefield, the U.S. military continuously dispatched submarines to attack the Japanese transport cargo ships, gradually cutting off the Japanese army's "food and grass" supply, and to a large extent accelerated the process of the demise of the Japanese invaders.

After the war, according to statistics from the United States Joint Army, Navy and Air Force Committee, during World War II, US submarines sank a total of 52 Japanese ships and 1314 million tons at the cost of losing 530 submarines, accounting for 55% of the total losses of Japanese ships.

Japan, which has lost its sea line of communication, has reached the brink of collapse. Even without the atomic bomb, they cannot last long.

Undoubtedly, in that time and space, in the Pacific War that defeated Japanese fascism, the U.S. submarine force was a group of fierce sharks cruising on the Pacific battlefield, which greatly accelerated the historical process of anti-fascism.

However, in the current time and space, although the U.S. submarine force is still very strong and equipped with a large number of advanced submarines, due to the much stronger anti-submarine capabilities of the Japanese army, the results of the U.S. submarine force are far from the original, and their own losses are also much greater.

Up to now, Yang Fan has finally made a big move. The XXI submarine is fast, easy to maneuver, strong in maneuverability, strong in firepower, safe and reliable, and is very suitable for long-term continuous underwater operations.

As long as they are used well, they can completely become a group of mighty mad sharks!

"Report to the captain, the southeast direction is three degrees east by south, at 25 nautical miles, the Japanese fleet is found!"

"Repeat,..."

"Haha, it's finally here, brothers fuck, ready to kill!"

The so-called "hard work pays off", after wandering in the South China Sea for three full days, Luo Faren and others finally arrived at the long-sought Japanese transport fleet.

Chapter 1571 One Hundred Thousand Whys

After discovering the target and positioning it, the Type XXI submarine immediately retracted its snorkel, dived to the escort area of ​​the Japanese transport fleet at a silent speed, and then set up its net and waited for the devil escort fleet to come to its door.

"Yoxi, what a peaceful morning! This is really a lifeless escort mission!"

Major Tesaburo Araki, the captain of the Kagero-class destroyer Shiranui, stood on the side of the ship, facing the rising sun in the east, stretched comfortably, and sighed out of interest.

As a new type of destroyer at the beginning of the war, the Kagero class was the best destroyer built by the Japanese Navy. Its speed, range, firepower and hull stability were all excellent, and its comprehensive performance surpassed the destroyers of other countries.

Although due to the common problems of Japanese destroyers, the Kagero-class destroyers had no radar, poor sonar equipment, and weak air defense capabilities when they were built, but with the development of radar and sonar technology, these shortcomings have gradually been made up for.

The design of the Yangyan class largely benefits from the previous Manchao class, and the two classes of ships are very similar in shape.

This type of destroyer has a full load displacement of 2490 tons, a length of 118.49 meters, a width of 10.82 meters, a draft of 3.76 meters, and a maximum speed of 35 knots? , with a maximum range of 6000 nautical miles and a crew of 239.

武器装备6门127mm主炮，92式4连装610mm重型鱼雷发射管2座，装备九三式氧气鱼雷，并带有布雷与扫雷具、鱼雷再装填装置，以及单管25mm高射炮2座。

随着战争局势变化，在1942～1944年期间，大部分阳炎级驱逐舰拆除后主炮塔，25毫米防空炮增至28座另外加装12.7毫米高射机枪4座

The mine-laying and mine-sweeping devices at the stern were also removed and replaced with 4 depth charge throwers.

With these changes, the positioning of Yangyan-class destroyers is more in line with actual needs, and the air defense and anti-submarine capabilities have been greatly enhanced.

As the main destroyer of the Japanese Navy, a large number of Kagero-class destroyers performed well in the war, participating in the Pearl Harbor attack and almost all naval battles.

It is also because of this that the Kagero-class destroyer lost a lot. After the surrender, only one Xuefeng was left, which was delivered to the Kuomintang Navy as a compensation ship.

And this Yukikaze can be called the best Japanese destroyer. It has experienced countless tragic naval battles from beginning to end, including the special attack on Okinawa accompanied by the battleship Yamato.

When the Kuomintang Navy retired, the Japanese people hoped to buy it back as a memorial ship, but it was rejected and eventually disintegrated.

The destroyer Shiranui, also known as the No. 2 Kagero-type destroyer under the command of Arotesaburo, was hit from the starboard side of Shiranui to the first boiler room in the midway naval battle last year, and was on the verge of sinking.

Later, the ship maintained its buoyancy after emergency repairs, and was finally towed away by the "Maizuru". The rescue team completely destroyed and cut off its first chimney to the front half, and towed it back to the Maizuru Naval Port in Japan.

In October 1943, the destroyer Shiranui returned to the front line after being completely repaired.

Due to the increasing activity of the Allied submarine force, the rear shipping routes were attacked more and more frequently. Therefore, starting from January 1944, the destroyer Shiranui "retired to the second line" to serve as the transportation escort mission for Guam.

"Yeah, this kind of journey is too monotonous and lonely. I really miss the good old days when we traveled across the sea!"

The first mate Takano Narumi who was standing aside was also quite emotional.

Although it is clear that the current Japanese navy is declining and is in a retreat, these Japanese navy still feel good about themselves in the eyes of the Japanese navy, and they are still immersed in the brilliant victory of the Japanese navy a few years ago.

However, there is a good saying, pretend to be struck by lightning!

"Oh no!"

"The big thing is bad, torpedo attack!"

"On the port side of the bow! There is a torpedo attack!"

Just as Arata Saburo and Takano Narumi sighed, thinking that it would be overkill to get them to the rear to perform escort missions, suddenly a ghost crew member yelled out in horror.

"Nani? Torpedo attack? How could there be a sudden torpedo attack? Why was there no sign beforehand?"

Huang Ti Saburo was immediately stunned. This was simply a slap in the face of Chi Guoguo. His own destroyer was equipped with the most advanced radar and sonar systems, and his special job was anti-submarine work.

But now, in broad daylight, there is an enemy submarine directly attacking him?

"Baga, did you make a mistake? In this case, launching a torpedo attack, aren't they seeking their own death?"

Huang Taisaburo was not only confused, but also very puzzled, because in his current cognition, the submarine and the destroyer are completely the existence of a grandfather and a grandson.

That's right, the current submarine basically has no choice but to run away when it encounters a destroyer. Under normal circumstances, it would never choose to use this method to make a frontal confrontation in broad daylight.

First of all, destroyers have fast speed and good maneuverability, generally above 30 knots, and their maneuverability is obviously much better than that of submarines. They can even evade submarine attacks and then counterattack.

Secondly, World War II submarines do not have deep-sea attack capabilities. When attacking targets, they must float to the surface, making it difficult to hide.

Therefore, if a submarine wants to attack a destroyer, it can only attack the destroyer in a vertical direction, or estimate the opponent's course and strike at 90 degrees, so as to increase the hit rate of one hit.

Otherwise, at the speed of a destroyer, it only needs to easily swing the tail of the Shenlong to avoid the torpedo attack.

Conversely, once the submarine's whereabouts are exposed, it basically has to be a lamb to be slaughtered. The destroyer's ultra-fast maneuvering speed of more than 30 knots can kill the submarine just by going around.

Because the submarine is very noisy and slow underwater, the speed of the underwater submarine is about 10 knots, and the endurance is not strong enough, so it needs to float to the surface of the water frequently to take a breath.

This leads to the disadvantage of insufficient endurance of the submarine. The destroyer only needs to determine the area where the submarine is active and wait for a period of time in this area.

It can be said that the submarine has almost no extra way to go, except for the two options of fighting to the death to survive or floating to the surface and surrendering in humiliation.

Although there are a hundred thousand reasons in his head, Huang Ti Saburo's movements are not slow at all, and he hastily looked in the direction pointed by the observer not far away.

"Nani? Why are torpedoes so fast? And so many?"

However, if you don't see it, you don't know it. When you saw it, you were taken aback. Aratasaburo was shocked to find that there were no less than 5 torpedoes in the vertical direction of the ship's hull, and they were hitting the destroyer Shiranui head-on at an extremely fast speed. space.

"Baga! How did this happen? What are the radar soldiers and sonar soldiers doing? Why didn't they find out a little bit of movement in advance?"

Seeing the vast number of torpedoes coming, the smile on Narumi Takano's face instantly froze, replaced by panic and despair.

Such a dense torpedo attack can be completely avoided by simply turning the rudder and sprinting, but once the torpedo hits directly, the small body of its own ship may only end up in a tragic end.

Chapter 1572

"Baga! Hurry up, charge at full speed, hit the left full rudder!"

"Fire! Destroy these damned torpedoes!"

"Drop depth charges immediately! Hurry!"

Looking at the crests of several not-so-obvious torpedo routes, Saburo Huang was really confused, and was stunned for a moment, not knowing what to do.

However, the well-trained devil crew members with a strong desire to survive could not sit still, and began to panic and bustle without waiting for the boss to issue orders.

What I want to say is that intercepting torpedoes is not as simple as imagined, and it is not an exaggeration to describe it as difficult to reach the sky.

General torpedoes have at least about 40 knots, and the speed of warships is basically around 30 knots.