Take Taobao to fight against Japan

Of course, during this period, Rommel's North African Army will definitely not be idle, waiting for his throat to be stuck step by step.

The current Italian navy is booming, and without the threat of the British navy, they will definitely greatly improve their shipping capabilities.

After receiving a large amount of supplies and no worries for the time being, Rommel will definitely launch a hard attack on the Alamein defense line, trying to break through from the front to open the situation.

But it doesn't matter, for defensive counterattacks, the Huaxia Huben Army is the best. Yang Fan has enough confidence and strength to withstand the attack, and let Rommel steal chickens without losing money.

"Here I have a very interesting piece of information that I would like to share with you."

After putting out the plan on the tray and initially reaching a consensus, Yang Fan pointed at the map with a wooden stick and said:

"It is well known that there are only two routes to enter the Mediterranean by water, either through the Strait of Gibraltar, or through the Red Sea and then through the Suez Canal.

Now the Suez Canal and the Strait of Gibraltar are under the control of the Allied forces, but it is strange that German submarines can still freely enter and exit between the Mediterranean Sea and the Atlantic Ocean, causing great harm and threats to the Allied forces.

So do you ever know how the German submarine did all this?Do you want to know what's going on here? "

Chapter 1311 The Secret of the Strait of Gibraltar

"What? Do you know the answer?"

Hearing these words, Cunningham's eyes lit up immediately.

At the same time, Auchinleck, Rich, Barton, Stilwell and everyone else also looked at Yang Fan in unison, their eyes full of curiosity and thirst for knowledge.

As Yang Fan said just now, this problem has troubled them for a long time.

If German submarines want to enter and leave the Mediterranean Sea from the Atlantic Ocean, they must pass through the Strait of Gibraltar.

The Strait of Gibraltar is the dividing line between Europe and Africa. It is the throat of the Mediterranean Sea. It is about 58 kilometers long.

At present, both sides of the Strait of Gibraltar are under the control of the Allied Forces, and lightning monitoring stations have been deployed.

It stands to reason that in such a narrow strait, as long as the Allied forces guard here, German submarines will have no chance to enter and leave the Mediterranean Sea.

But in fact, the German submarine force seemed to be in an uninhabited territory. It could always easily evade the radar monitoring of the British and French allied forces in the Strait of Gibraltar.

They simply don't know where the German submarines came from and where they hid?

"In fact, the answer is very simple. An important factor that helps German submarines enter and exit the Strait of Gibraltar without being detected is the ocean currents that exist in the Strait."

Facing the curious eyes of everyone, Yang Fan talked eloquently and began to popularize the common sense of marine science to everyone.

The Mediterranean Sea to the east of the Strait of Gibraltar is an intercontinental sea surrounded by closed land. The climate belongs to the Mediterranean climate. The summer is hot and dry, and the seawater evaporates vigorously. Therefore, the salinity of the seawater in the Mediterranean Sea is higher than that of the Atlantic Ocean west of the Strait of Gibraltar, and the natural sea level is lower. .

On the contrary, the Atlantic sea area is wide, with large rainfall and low evaporation, so the seawater has low salt content and low density, and the natural sea level is high.

Therefore, two rough ocean surfaces are formed near the Strait of Gibraltar. The seawater at the bottom of the strait flows westward from the denser Mediterranean side to the Atlantic Ocean, and the upper layer of seawater flows from the Atlantic Ocean to the Mediterranean Sea.

The Germans took advantage of this law of sea water flow. When entering and leaving the Mediterranean Sea, the submarine turned off the engine, descended to a relatively deep area below the sea surface, and flowed out of the Mediterranean Sea to the Atlantic Ocean along the ocean current.

When returning, the submarine was raised to a relatively shallow area, the engine was turned off, and it flowed back to the Mediterranean along the surface ocean current.

The submarine cannot be detected by sonar without engine noise. In addition, the submarine does not surface or sail in the snorkel state, so that it can avoid the visual and radar detection of the British and French allies.

"What? That's fine too!"

"My God, these Germans are so cunning!"

"No wonder we can't detect these damn German submarines, it turns out to be like this!"

"General Yang Fan is really powerful, such information can be obtained!"

"Yeah, it's really not simple. This problem has been bothering me for so long, and now I finally understand it."

After listening to Yang Fan's explanation, Cunningham, Auchinlake, Rich, Barton and others were all enlightened, their expressions were wonderful, and they kept nodding their heads in admiration, adding a little more recognition and admiration to Yang Fan.

"That's right, there is nothing in this world that our chief executive can't handle!"

"Now you should be convinced."

Lu Shengfeng, Meng Wuan and the others held back their smiles, full of pride and joy.

After a long while, Cunningham started making noises again, and asked Yang Fan loudly: "I admit that this discovery has solved a mystery that has troubled us for a long time, but what specific effect does it have?

Even if we know that German submarines enter and exit the Mediterranean Sea in this way, what can we do with them? We are still helpless! "

Cunningham did not simply argue with Yang Fan, but pointed out the current anti-submarine problem.

In addition to visual inspection, current anti-submarine means mainly include sonar anti-submarine and radar anti-submarine.

Sonar and radar are two completely different reconnaissance devices.

Sonar is an underwater reconnaissance device that has both active and passive functions. It can accurately locate the distance of submarines at close range. Under good sea conditions, it can detect submarines about 1.5 kilometers away.

For the large fast transport fleet, the main form of transportation of the Allied Forces in the Atlantic Ocean, it is basically meaningless to use sonar to search submarines, because the speed is fast, the noise is too loud, and the current level of sonar technology is not good enough, and the range of action is limited. Effectively search for submarines.

Therefore, the current sonar is mainly used for attacking submarines rather than searching for them.Submarines are primarily limited by radar, not sonar,

Radar is used for reconnaissance from the air to the sea and above, and has a relatively long range of action.

Conventional power submarines in the world are not equipped with an AIP system (that is, an airless propulsion system). When sailing on the surface, diesel engines are used as power and batteries are charged at the same time; batteries are used to provide power when sailing underwater.

As a result, submarines often surface to recharge, and radar can detect the snorkels that come out of the water when the batteries are periodically recharged.

The main way for the Allies to deal with U-boats is to use long-range patrol aircraft to patrol repeatedly, use visual and radar search methods to search for submarines sailing on the surface or in the snorkel state, and attack after they are found.

Under normal circumstances, submarines will not surface during the day, so most of the time radar can come in handy at night, and only patrol aircraft and visual reconnaissance during the day are enough.

However, the reduction of the wavelength also shortens the range of the radar, and the part of the submarine above the water is very small.

The Type 286 sea-search radar currently used by the British Navy has an effective detection range of U-boats on the surface of the water, depending on the sea conditions, only 3-5 kilometers away.

And it will be completely undetectable by the Metox warning receivers on the German U-boats that listen to the meter wave radar.Therefore, even if the German submarine surfaced to charge, the efficiency of anti-submarine radar was very low.

In addition, there is an auxiliary anti-submarine means, that is, the radio detection of destroyers and frigates.

We all know that the main role of destroyers and frigates is to escort transport ships, step forward to intercept submarines when they attack, reduce fleet losses, and destroy attacking submarines as much as possible.

In fact, they also have a very important role in radio detection.

Because wolf pack tactics require frequent use of radios to communicate with other submarines, report the target position, and then wait for other submarines to arrive before launching a cluster attack.

And this radio communication process can be detected and intercepted. Once the escort ship finds frequent radio communication at close range, it can confirm that a U-boat has found itself, and can actively search or call an aircraft to search.

It’s just that these anti-submarine detection methods have no way to effectively target the German army’s use of the density difference to enter and exit the Mediterranean Sea and the Atlantic Ocean, or even lurking on the shipping line to attack the transport fleet.

Chapter 1312 This routine again?

"General Cunningham, you are right. Even if we know the answer, according to the current anti-submarine technology, it is difficult for us to make effective countermeasures to prevent German submarines from freely entering and leaving the Mediterranean Sea!"

Yang Fan smiled slightly, then changed the subject:

"But it doesn't matter, as long as we can find and destroy the German submarines before they launch an attack, even if they can freely enter and leave the Mediterranean Sea and appear in any sea area in the world, so what?"

"Hmph, that's easy to say."

Cunningham twitched his nose, and snorted coldly: "The British Empire has the most advanced radar technology and sonar technology in the world. So far, it has no way to deal with the wolf pack tactics of German submarines. Is it possible that you can do something better?" Effective methods or technical means are not working?"

Yang Fan smiled lightly, and nodded seriously: "Cunningham, you are right, it is really difficult to effectively deal with the wolf pack tactics of German submarines with the existing anti-submarine technology and means of your British Empire.

But what I want to say is that that is your British navy, not our Chinese navy.We have enough technical means and strength to crack the wolf pack tactics of German submarines. "

Cunningham turned his head to look at Yang Fan, and said extremely displeased: "Either you come up with convincing and real means. Or don't talk nonsense here. I don't believe that there is anything more powerful than the British Empire in this world." Advanced radar technology and sonar technology."

During World War II, Britain's radar technology started the earliest, and it was also an advanced country, not one of them.

Before the war, Britain established a radar early warning network and installed radar on some ships, which was later further extended to night fighters and anti-submarine aircraft. This was also the key to reversing the situation in the battle against German submarines in 1943.

Before 1943, German submarines dominated the Atlantic Ocean, causing the Allies to repeatedly delay the opening of the Second Front.

Since the popularization of more advanced radars on British and American ships, the British and American fleets were able to sink a large number of German submarines in 1943, making the successful Normandy landing in 1944.

The United States developed vigorously after receiving technical support from the United Kingdom. The biggest innovation of the Americans is to integrate the fire control and air-to-air radars on warships to form a CIC system.

The Germans established their own radar early warning and fire control system in the middle of World War II, which played a significant role in countering the British night bombing.And it is widely used in night fighters.

Although the Soviet Union was also equipped with radar during World War II, RUS-2 was a land-based early warning radar, but the number was small. The Pe2 aircraft was equipped with gneiss radar for night air defense.

In addition, Japan is not slow in the development of radar. In 1939, it successfully produced a cavity magnetron with very reliable performance, while the United Kingdom only developed it in 1940.

However, the upper echelons of the Japanese government did not pay much attention to it, and the internal friction between the navy and the army seriously delayed the development, resulting in extremely unreliable radar performance. It was very sad until the end of World War II and failed to play its due role.

However, in the current time and space, the Japanese suffered a big loss from Yang Fan's hands early, and obtained the finished radar product by sneak attack early, so they have already produced the radar with the help of the Germans.

As for sonar technology, it was invented by Lewis Nixon of the British Navy in 1906. It had already been applied to the battlefield during World War I to detect submarines hidden under the water.

"Confidence is a good thing, but blind confidence can only be described as stupid."

Naturally, Yang Fan would not miss this good opportunity to pretend to be a slap in the face, and immediately said in a provocative tone: "General Cunningham, do you dare to bet with me on this matter, if I win, your Mediterranean Fleet will be defeated." You must obey my order and dispatch unconditionally!"

Cunningham frowned and asked, "What if you lose?"

Yang Fan said with a smile: "If I lose, I am willing to gamble and admit defeat. Our Huaxia Huben Army accepts your order and dispatch unconditionally, and I will not interfere with your command again!"

"No, this is too cheap for you. Your Huaxia Navy simply doesn't exist."

Cunningham is very good at bargaining, and he increased his chips with great confidence: "If you lose, you and all your Chinese expeditionary forces must obey the command of our British Empire. If I lose, our Mediterranean Fleet of the British Empire will fully listen to you Command, how?"

"Very good, a gentleman's words are hard to follow!"

Yang Fan has already begun to secretly laugh.

Although after some tit-for-tat operations before, Cunningham reluctantly agreed to cooperate with the cover operation, but after all, the twisted melon is not sweet, and this guy will definitely be greatly discounted if he is unwilling.

If it can be subdued this time, it will be a great thing.

"Well, it's a deal! The generals of the British Empire never break their bets."

Cunningham accepted the challenge without the slightest hesitation. He simply did not believe that there could be more advanced radar and sonar technology in the world than the UK.

Because these two technologies have always been the housekeeping skills of the British Navy, and they are also one of the important reasons why the British Royal Navy's fleet is so powerful, so Cunningham is full of confidence and pride in this.

However, this time Cunningham met the man who cheated on the system. He was destined to be struck by lightning and severely slapped in the face today.

"Oh my god, is this routine coming again?"

"Why did this idiot agree so hastily?"

"Could it be that the Chinese really have more advanced radar and sonar technology than the British Empire?"

"Is this Huaxia commander really omnipotent?"

Just when Cunningham was full of confidence, thinking that he could win the round without any suspense, and fight for himself and the British Empire, Auchinleck, Rich, Patton and others all made a show of caring for the mentally retarded. looked at Cunningham.

After getting along for more than a month, they already know what kind of existence Yang Fan is. Not only does he often speak amazingly, but he also has extraordinary insight and wisdom.

The combat effectiveness of the troops under his command, as well as the various advanced technical equipment and instruments they possessed, opened their eyes even more, and they deeply felt the despair that they could not match.

Seeing that Yang Fan is using the same recipe to deal with Cunningham at this moment, they all firmly believe that Yang Fan is pretending to be a pig and eating a tiger again, and they will never think that this mysterious and powerful man will shoot himself in the foot.

Well, once the habitual thinking is formed, you can't change it even if you want to.

"Hehe, you idiots can't deal with so many people! In the end, I have to rely on me to fight for the dignity and power that the British Empire deserves!"

However, Cunningham, who was saluted by everyone, did not realize the meaning contained in the eyes of the people, and thought that they were adoring and envious of himself, and became more and more complacent.

Chapter 1313 Sonobuoy

"Then, as you wish, I will prove to you with facts that our Huben Army has radar technology and sonar technology that can crush your British Empire Navy."

Sure enough, as everyone expected, when Cunningham agreed to the bet happily, Yang Fan showed his fangs, waved his hand and said:

"Adjutant Liao, get someone to bring in the slide projector. I want General Cunningham and other generals to take a good look at the latest anti-submarine technology and equipment of our Huben Navy."

"Yes!"

Liao Youtian ran out of the meeting room immediately.

After a while, Liao Youtian and others carried a slightly bulky old-fashioned slide projector into the meeting room, and arranged the scene in a few clicks.

Yang Fan not only has a more advanced projector, but also a matching desktop computer and notebook, which can completely conduct on-site persuasion education more intuitively and effectively.

However, it is obvious that such an aggressive high-end operation is not suitable for the current occasion. It can only be used in highly confidential scientific research units, and it must never be exposed.

"Okay! Huaxia really has a more advanced shipboard radar system than the British Empire?"

"My God, they still have such advanced anti-submarine hedgehog guns!"

"My God, they actually invented such an advanced anti-submarine sonar buoy? How is this possible!"

"That's right, we have just established a sonar buoy project in the United States, and they have already successfully developed it and can be used in actual combat."