The winter of 1915, for the entire Entente, was a nightmare, in fact, throughout 1915, they did not achieve much, in the army, was completely suppressed by Germany, that is, in the second half of the year, some good news, on the one hand, the confiscation of Chinese capital, the wealth of the Chinese, let them all eat, although the United States ate the largest piece, but for Britain and France, the harvest is quite a lot, plus the excellent effect of sonar, The entire Entente bloc was optimistic about the war of 1916.

It's a pity that all this, in the winter of 1915, was hit to the bottom, the sea wolves that had been swept up almost appeared, at the end of 1915 came out again, even more ferocious than before, although the previous sea wolves were fierce, but only piecemeal, at most sneak attack one or two merchant ships, although it brought a huge shadow to the North Atlantic route, so that the fixed battle damage rate reached 10%, but the submarine was almost unable to confront the escort fleet, in the face of the more powerful escort fleet, the submarine generally will not attack, which basically guarantees security.

This time the sea wolf is different, the momentum is surging, for most of the ship regiment is a war of annihilation, 4 escort like this, 8 escort like this, and even more than a dozen warships, it is still like this, that is, now, the formation of a large ship group, the escort force is guaranteed to be more than 40 ships, and to remain vigilant anytime and anywhere, if there is any wind and grass, depth charges will be thrown, which ensures the safety of the ship group.

Such a result is unacceptable to the Entente, large-scale ship groups can be short-term, but not for a long time, they can not import materials, transport materials, they have to wait until the million-ton class, such timeliness, at least more than doubled, and a large number of fast forces are pinned down to the escort, which is not good for the whole, destroyers, light cruisers, although not the main force of the strategic decisive battle, but the important force of the reconnaissance fleet and the search fleet, and also the tactical force of the strategic decisive battle, It is also impossible for these ships to be used endlessly, which is not good for the overall strategy.

Before finding the weakness of these sea wolves, the Entente side will never dare to act rashly, they try their best to find the weaknesses of these sea wolves, in their opinion, the submarine is a sharp weapon hidden in the water, once the water is lost, for the submarine, it is a catastrophe, just like before, the listener can not find the exact location of the submarine, so that the two sides are a little staggered, but in the era of sonar, technology is more reliable than people, and finally caused the miracle of naval warfare, after losing the hiding place, There was a miraculous reversal of the battle between submarines and warships, and there was almost no place for submarines in the entire Atlantic, and submarines were like a lone wolf far away from human society, slowly licking their wounds, and they would only act once for a long time, and they would risk their lives, even if they achieved results, it didn't matter.

It is such an example that makes the Entente understand that if they want to deal with submarines, they must first find the weaknesses of submarines, at least they must discover submarines, and only when they discover submarines can they be able to deal with them, otherwise, they can only rely on quantity, this kind of reliance is not reliable, and cannot be implemented for a long time, and if they want to cure the symptoms and cure the root cause, they must find the weaknesses of new submarines.

After knowing the exact facts, the Entente began to search for data, those submarines of the Sea Wolf, after several attacks on the merchant ships of the Entente, not every time it was a war of annihilation, there were survivors, and there were more lucky merchant ships and warships that escaped, and they conducted a comprehensive visit to these, from the beginning of the attack, the power of the attack, to the final result, detailed statistics and investigations were carried out, and finally the basic information of this Sea Wolf was generally obtained.

Overall, it is very ferocious, beyond the imagination of all scientists, sonar immunity, yes, in the previous several attacks, dozens of large and small warships have been accumulated, of which the number of sonars is as high as more than 40, these sonars are enough, but so many sonars, none of them have found these submarines, which basically means that it is almost difficult for sonar to find submarines, and the moment of discovery of the attack in the record is already the beginning of the torpedo launch, such a suddenness is very strong, many ships were hit by such a sudden attack.

Not to mention the performance of German torpedoes, even if the torpedoes currently in the hands of the Entente Powers, as long as they can evade sonar, if they are launched at a relatively close range, not many ships can dodge them.

In addition to the strength of the sea wolf, the torpedo is also an important aspect, the Entente did not pay much attention to submarines before the outbreak of the European war, but among the sea wolves, suffered so many losses, of course, they also began to study submarines, knowing that the maximum combat power of submarines is actually placed on the torpedo, for submarines, the greater the power of the torpedo, the greater the power of the submarine itself, this new type of sea wolf, the power of his torpedo has also been upgraded to a level, far more powerful than the torpedoes that have been obtained before, The concealment of this new torpedo is quite strong, the speed is extremely fast, and there is almost no waterline, in this case, it is extremely difficult to dodge, which is also the fundamental reason why the Seawolf can sink a large number of escort warships, most of the time, the battleship does not even react, and is attacked by the torpedo.

At this moment, most of Britain's forces were held back by the war in Europe, and they couldn't put a lot of energy into the study, and the main force to crack the sea wolf became the United States, and after the technical support of the United Kingdom, the United States became the strongest in the field of naval technology, with a strong technical foundation, plus more than the British, French, and Russian scientists, who jointly devoted themselves to the field of technological research, it must be advancing by leaps and bounds, to discover submarines, or to rely on sonar, After their top scientists' research, they felt that these submarines were not immune to sonar, but the sound was quite low, although they couldn't figure out why it was so low, but there was still a solution, increase the resolution of sonar, if you can remove some of the background music on the bottom of the sea, increase the sensitivity of sonar, so that you can find submarines. The United States began to increase its investment in sonar, and in just half a month, at least 12 different universities built sonar research institutes, with a fixed investment of up to 50 million US dollars.

This is a huge amount of research funds, invested in any field will have an immediate effect, but unfortunately the Americans ignore the difficulty of increasing the resolution of sonar, the performance of this electronic components is improved, more sophisticated electronic components are needed, and there is no way to improve so high for the time being, although the resolution of the decibel is increased from 130 decibels to 120 decibels, the increase is huge, but the highest 110 decibels from the Chinese sea wolf, the limit can even reach about 100 decibels, or not.

However, the study of torpedoes, so that the resolution of the sonar has increased somewhat, especially to increase the ability to analyze and track torpedoes, in the information collected by the Entente, although the new torpedo has no waterline, but can be found by sonar, torpedoes can not reduce the sound, although the German torpedo sound is already quite low, but in the range that can be detected, for this aspect of the sub-project, has achieved a certain degree of growth, unfortunately, only to improve the reaction time of sonar a little, at a distance of about 800 meters, 65 knots of torpedo, In less than 30 seconds, you can go the whole way, 30 seconds for any ship, the reaction time is still a little slower, as long as there is a slight negligence, it is normal to be hit, but compared to before, completely defenseless, and even do not know where the opponent is, this is much better, especially the results obtained by American scientists through the analysis of the battlefield, the opponent's submarine should be launched at a distance of several hundred meters from the battleship at the nearest distance, such a close distance, the other party is too bold, if the sonar can find the torpedo, If you determine the opponent's position, even if you can't resist, you can counterattack, so that the opponent will not get so close, and it will also buy time to dodge.

After the difficult start of sonar, the tactics of combining reconnaissance aircraft and airships appeared, under accurate reconnaissance, airships can be bombed more accurately, this bombing is not fixed in the daytime, at night, in any weather conditions, as long as the airship can take off, it can, which brought huge trouble to the Entente, millions of tons of military supplies were destroyed, this loss is almost unacceptable, and the most important thing is that the war has a new weapon.

A heavier than air aircraft, faster, more flexible to use, more reliable, a large number of flying enthusiasts, was included in the scope of the army, huge investment investment, itself is only circulated among enthusiasts, difficult to continue to develop the aircraft, after the rapid development, at least no longer use the engine of the car, there are scientists to concentrate, the use of 100 horsepower, even 150 horsepower engine, the performance of the aircraft, immediately got a huge improvement.

Of course, these cannot be compared with China, in addition to being forward-looking, China also has such a power engineer as Yang Yuanzhao, in the field of power, he is definitely the world's master, and even standing on the shoulders of masters, far more powerful than ordinary masters.

China has also entered the aircraft era earlier than other countries, and has formed a large-scale and systematic development a few years earlier, and this gap is not something that time can make up.

Technological upgrades caused by weapons, this is unavoidable, from the reconnaissance plane to Europe, Yang Yuanzhao has no intention of keeping it secret, this reconnaissance plane, as long as it is exposed to the vision of all countries in the world, this reconnaissance plane will not be able to be used, then China must study a new generation of reconnaissance aircraft, in China is not without a higher reconnaissance plane than this, the strength is not bad, but in order to meet the new challenge, China has proposed a higher level of reconnaissance aircraft research, about the research on reconnaissance aircraft, or continue to continue, in it, Yang Yuanzhao proposed two directions, and this one almost represented the main direction of the future reconnaissance aircraft. (To be continued.) )