PS: Thank you for the reward of "There is a Dream in the World" from the book friend, and ask for a recommendation vote ^_^ again

Of course, although the drop-shaped submarine is much safer than the traditional submarine, it cannot be said to be absolutely safe, after all, the conventional submarine is not a nuclear submarine that can be underwater all the time, and every once in a while it has to float up and start the diesel engine to charge the battery

In addition, even against merchant ships without the escort of warships or aircraft, the teardrop-shaped submarine is much better than the old submarine, because the old submarine cannot catch up with the merchant ship when it sails underwater, and the so-called "wolf pack" tactic requires a submarine to sail on the water to keep an eye on the target, which is obviously very dangerous, because the merchant ship can send a telegram to the warship or aircraft near the country for help. Although the "wolf pack" tactic is a genius idea, it is not easy to cooperate, and the time required for each "hunt" is also long, and it is limited by many objective factors, and where can it directly catch up with the enemy ship and get close (there is no threat from escort ships or aircraft, the submarine must choose to attack closely, first, the hit rate is high and the torpedo is saved, and the second is that the ship sinks too fast to ask for help. How convenient, efficient and safe is a drop-shaped submarine that fires a torpedo with one hit?

With Dönitz's genius in submarine warfare, he was immediately keenly aware that once the teardrop-shaped submarine was put into service and used to break the engagement, one would be equal to, or even surpass, a dozen old submarines, and it would be a threat to enemy combat ships. It is far from being comparable to the old submarines. But on the premise that Germany's preparations for war were almost complete, this submarine made him quite distressed

Because the combat mode of the drop-shaped submarine is very different from the old submarine, the "wolf pack" tactics he designed for the old submarine cannot be applied at all, and not only in terms of tactics, but even in the operation of the submarine itself, there is a big difference, if the veteran on the old submarine is transferred to the "Type 21" submarine, it is impossible to be proficient in operation without half a year, and the guy who is not so bright in his brain even needs a year. Because not only are many of their combat experience useless, but even a large part of the knowledge and skills they learned in the submarine school have to be forgotten and re-learned

And Dönitz, who is a close confidant of the mustache, is well aware that the pressure of foreign debt has reappeared. In the near future, Germany would have to wage war long ago to prevent its domestic economy from being destroyed by heavy foreign debt. But it is obviously too late to start training the crews of teardrop-shaped submarines now, and as the most important weapon in the navy, submarine warfare is indispensable for Germany, not to mention that so many "U" boats built before cannot be directly abandoned. This is a huge waste for a resource-starved Germany.

To this end, Dönitz decided, on the one hand, to switch the production capacity of old submarines to the production of teardrop-shaped submarines as quickly as possible. And the submarine school will also cease to apply to the teaching content of the old submarines. Instead, he was taught the knowledge of teardrop-shaped submarines and related techniques and tactics. At the same time, the original old submarines had to be fully submarined, and the "wolf pack" tactic he had recently devised would give the empire the greatest advantage in the early stages of the war. The soon-to-be-completed "U" boats and the graduating cadets are still the same as the previous jihua, and they and their predecessors will buy enough time for the juniors who will operate the Type 21 submarines, and when those juniors and the new submarines they operate are enough to take over, these old people will go back to the submarine school to make up for the transformation, if they are still alive at that time

In contrast, the Chinese Navy is much more convenient, because they have never had an old submarine, so it is easier to directly accept the new methods of operation and submarine tactics. In addition, in the Chinese Navy's "flying and diving fast", in addition to dealing with the enemy's ships, the aircraft may also encounter the enemy's superior aircraft group, which may not be able to bargain, and the speedboat is even more desperate to fight, compared with the submarine is undoubtedly the best use, because it always has the first hand, and the submarine is invincible, and the deterrent effect on the enemy country is also greater. Therefore, as soon as the drop-shaped submarine was formed, the submarine factory in Qingdao was required to produce it as quickly as possible, so that the Chinese Navy could get rid of the current shame of having to wait for the enemy to attack our territory before it could counterattack as soon as possible.

In 1940, due to the lack of time after the finalization, and the assembly line was paved with two, only 2 "Ming" class submarines were finally built, but because the modular construction method greatly increased the construction speed (Note 1), in the case of the second submarine construction base was not completed, the construction of Jihua in 1941 was as high as 12, and in 1942 it reached 18, and in 1943 it was 24, which is really incredible in terms of China's current national strength. Keep in mind that the teardrop-shaped submarine is larger than most older submarines and has a more complex structure

In addition to production, the Chinese Navy has also continuously put forward higher requirements for the performance of submarines, and it has not been satisfied because the "Ming" class submarines are temporarily the first shijie. And because of Hu Weidong's guiding opinions, the scientific and technological personnel of the relevant projects have always been on the right path, and the improvement focus is on the four aspects of diving depth, speed, endurance and noise, the performance of these four aspects is determined by the compression shell, shape design and engine level, but it is not without tricks, such as silencing tiles. Research in this area was carried out very early, and some results have been achieved now, but in order to keep it secret from Germany, the first generation of silocating tiles was not applied to the "Ming" class submarines, but later the performance of Chinese submarines has been firmly in the forefront of Shijie, and the silencing tiles are absolutely indispensable

In addition to the HNA and submarines, the "fast" in the "flying dive fast" has not been ignored, although after having submarines, there is no longer a need for torpedo boats to attack the enemy's large and medium-sized warships at great risk, but China's coastline is so long, even if it is only to prevent smuggling and smuggling, it needs at least several hundred patrol speedboats, and judging from the progress of missile research, it will not take a few years for China to have the earliest missile boats on the Shijie

Note 1: However, the early modular construction method also has a big disadvantage, that is, the production process is very afraid of interference, so the German application that has begun to be bombed by the Allies in the past is not very effective, but for the current peaceful Qingdao submarine factory, there is no need to worry too much about this aspect. (To be continued......)