The development process of the Japanese oxygen torpedo, if you don't look at the background of the story, you can use it to make an inspirational movie. The technician's bloody laboratory has become a daily plot, and the Japanese Navy even customized a set of armored bulletproof isolation screens for this project.

Because the torpedo project is a secret of the Navy, the technical department in charge of research and development cannot hire external experts, and can only rely on past experience to explore on its own, these people may be experts in machinery and manufacturing, but the problem is actually in the fuel used, for this problem, the research and development team is all laymen. The result can be imagined, the technical personnel continue to improve the structural parameters of the engine, but the result is to replicate the tragic failure again and again, to say that this mentality of repeated defeats and refusal to admit defeat is still very emotional, but on the contrary, these people have blown up so many times, and they have not even fully understood the cause and principle of the explosion.

The developers only knew that after injecting more than 25% pure oxygen into the combustion chamber, the engine exploded into a fireball as soon as it started, and when asked why it was like this, a group of people only scratched their heads with bitter faces. However, they obtained a bunch of detailed and reliable data from countless explosions, which laid a deep technical foundation for the final successful development of oxygen torpedoes.

In the end, the key to solving the problem was found by people in society outside the Japanese Navy. At that time, the Japanese Navy's Ship Administration Headquarters saw that such bombing was not a solution, and it seemed that it would not be possible to seek foreign help, so it was ready to pay for professionals to join the research of the project.

However, the navy's funds at that time were also tight, and some spare money was all for the construction of warships, and in the end, the commissioned research grant approved by the Ship Administration Headquarters was 7,000 yen. Now 7,000 yen is only enough to buy two cigarettes, but in Japan in the thirties of the twentieth century, it was really a lot of money.

In 1932, the international exchange rate of the yen was one dollar to three yen, which was considered a relatively strong currency. A Japanese Navy sergeant was paid about 13 yen a month, which was enough to buy a bottle of the best sake of the year, while a rookie ensign who had just come out of Etajima earned 850 yen a month, which was almost enough to buy two paulownia cabinets that were popular in the market at the time. A brand-new imported bicycle costs about 90 yen in a Tokyo store, while 20 pounds of fine flour can be bought for only 3 yen. The 7,000 yen in 1932 is equivalent to about 13 to 14 million yen in modern times, which is enough for a common family to live comfortably for two years.

The problem is that this seems like a lot of money, but it is far from enough for the research projects of the time, and this kind of bombing experiments is too expensive. As a result, the head of the Ship Administration Headquarters and the chief of the first section each donated half a month's salary, and the 13,000 yen needed for the research was scraped together, and the project was finally carried out smoothly.

The University of Tokyo, which outsourced the project, was a top-notch university, quickly found out the cause of the explosion and discovered an important situation in the experiment, which could have prevented the explosion if pure oxygen had been added after the combustion of petroleum fuel.

The researchers of the navy were overjoyed when they learned of this situation, and they immediately adjusted the ignition procedure of the engine, first starting the engine with ordinary air, and then began to input pure oxygen into the cylinder after the power was stable, and the result was that the first test was a perfect success, and then the Japanese navy carried out several experiments one after another, with success and failure, and finally in 1933, the "Type 93 acid torpedo" that made the navies of various European countries tremble in the future was officially finalized and produced.

Because the combustion aide used in the combustion of kerosene engines is oxygen, the combustion efficiency is several times that of ordinary air, and the huge mine body can hold more fuel, so that this torpedo has the advantages of high speed and long range at the same time, and this is put on ordinary thermodynamic torpedoes, these two parameters are usually presented in inverse proportion.

The ultimate firing range of 40,000 meters has exceeded the range of the main guns of most warships, there is almost no residual gas emission after oxygen combustion, and there will be no obvious bubble trail dragged by ordinary torpedoes when the torpedo is sailing, which greatly increases the concealment of the spear torpedo when attacking.

In fact, the spear also has a wake, its two pairs of high-speed reversing propellers will produce a cavitation effect, but the depth of the voyage is usually three meters below the surface of the water, so the wake on the sea surface is not very obvious, but if you observe from the air, you can still clearly see the straight underwater track of the torpedo.

At the same time, because of the special starting method of the 93 type, in the 500 to 1,000 meters flight that has just been launched, the engine burns not pure oxygen, but ordinary compressed air, and at this distance, the spear has a bubble trail like an ordinary torpedo, but in actual combat, the Japanese army often launches lightning strikes at a distance of 10,000 meters or even 20,000 meters, and the target of the attack often does not even know that the enemy has launched a torpedo, so in the early stage of the war, the US Navy fleet, which does not know the parameters of the Japanese torpedo, suffered a lot of losses.

To ask the German Navy whether it knew about the existence of such a torpedo, of course, there is no doubt about it, the German Führer can now draw a sketch of the structure of the Type 93 acid torpedo at his fingertips, and when he is interested, he can even draw you a follow-up improved model.

Raeder's command had obtained all the technical parameters of the Japanese oxygen torpedo and had some interest in this torpedo, but this was only interest, and Raeder had no idea what it was like to be dangerous and outdated. This torpedo is engraved with the obsession peculiar to the Japanese nation, and its flaws are as obvious as its advantages.

The Type 93 torpedo has hidden dangers in technology, and it is a weapon that is equally dangerous to the enemy, and this is very clear to the Japanese Navy, and if this thing is used well, it is a demon knife to kill the enemy, and if it is not used well, it will become a blade of self-determination. The more than 500 kilograms of Type 97 explosives in the torpedo head will not be merciful when they explode because they are of the same nationality.

The results of the Type 93 oxygen torpedo in history are indeed amazing, but when the US military figured out the technical indicators of this torpedo, it immediately improved its naval combat tactics in a targeted manner, and when the US military's shipborne radar technology matured, the losses caused by the spear torpedo began to decline rapidly.

Often, in a naval battle, the Japanese army struggled to fire dozens of torpedoes, but not only did not hit any of them, but also suffered heavy losses in the joint encirclement and suppression of the US naval and air forces. In the end, the remnants of the Japanese Navy's lightning strike team were forced to abandon the long-range lightning strike tactics they had always admired, and began to resume attacking at conventional ranges and even close to enemy ships.

Captain Robin was a little curious about the Type 95 torpedo, which was just the kind of curiosity that a soldier had about the new weapon, and although he knew the parameters of this torpedo well, this was the first time he had seen the real thing, so he would have paid more attention. Finding out that the captain of the German submarine had become interested in the Type 95 torpedo on the spare mineholder, Kijima couldn't help but smile slightly, he was not worried about revealing any secrets at all, because it was impossible to guess the performance of this torpedo just by looking at the appearance. The shape and size of the Type 95 torpedo were no different from the conventional 533-mm torpedoes, and it was impossible to find the cats in them without disassembling the shells.

When the Germans circled around the narrow bow torpedo compartment, Guidao stood at the waterproof hatch and greeted: "Captain Robin, please follow me to the rear power compartment next." ”

"Yes, no problem, Mr. Colonel." Robin nodded, and slapped his hand on the front torpedo tube of the Yi 60, and the flower room standing next to him suddenly felt his eyelids tremble, and a strange feeling that he didn't know how to describe was faintly floating in his heart.

PS: It's finally done, thank you for your understanding.

These chapters are all popular science chapters, and some book friends may not like them, but since they have been written, the author wants to tell everyone the interesting allusions he knows, after all, not all book friends in this book are World War II historians.

But it's also coming soon, the storyline starts to advance, and when the scene ends, our perspective will return to Shanghai.

PS2: Starting today, the author is going to enroll in advanced studies, and in the future, there will be at least two days a week for full-time courses, and writing will definitely be affected, and I am thinking about how to arrange the update time reasonably.

Thank you all for your support, and the author will continue to work hard.