In this cave, no one can really understand what kind of person Song Biao is, let alone them, even Song Biao's high school classmates and those comrades-in-arms in the battalion headquarters don't know, everyone only knows that Song Biao is a very awkward cow.

In Song Biao's own words, their family is rich in scholars.

Song Biao's grandfather is a social psychology expert who studied in Germany in the thirties, and is known as the only veteran scholar who has seen Freud himself, his grandfather is an expert in metallurgical engineering who studied in the Soviet Union, and he is also a veteran scholar.

Song Biao's father studied mechanical mechanics in West Germany in the 80s, and after returning to China, he became the first generation of super scholars in the field of structural mechanics in China.

His mother, an expert in the field of modern Asian history, has always worked in the Ministry of Foreign Affairs.

Song Biao, who grew up in this kind of family, is naturally very distorted, when he was a child, he was strange and confused for adults, he first found his father in his second year of junior high school, and the result was "UFO atmospheric flight dynamics theory and flight envelope conjecture", when he graduated from high school, he sent his father's college to study mechanical design, he felt too distorted, and inexplicably went to be a soldier.

The family was more awkward than him at the time, but he never understood the child's heart, so let him go with the surname Suo, it's a big deal to come back to college after completing military service, and the result is even more awkward, he actually applied to be a volunteer again.

The army really wanted him at that time, and the political commissar of the detachment specially prepared to call and communicate with his family to let his family understand national defense, but when he looked at the list of this scholar's family, he finally didn't dare to call.

Song Biao had a lot of awkwardness, he was very interested in the 30 rifles and the Mosin Nagant rifles, so he disassembled the two guns into parts and compared them with each other, sat by the fire and pondered, and found a ruler to measure there, trying to calculate where the recoil of the 30 rifles was low.

The recoil of the Mosin Nagant rifle is relatively low, even lower than that of the Lee Enfield, and the caliber is about the same, the only explanation is that the bolt is locked at the front end, the return stroke is longer, and the frictional drag coefficient and stress changes generated by the more complex bolt parts also cushion the recoil.

What about thirty rifles?

Obviously, the caliber is smaller, and he thinks that the stress change of the bolt of the 30 rifle should be very small, and it is basically all about the small caliber to solve the recoil problem, because the stress change is small, and the coefficient value of the overall stress transformation of the firearm is also low, especially the change of the chamber and barrel during the shooting process is extremely low, which ensures higher shooting accuracy and straight ballistics.

Just from the perspective of the stress resistance change coefficient of the material, he personally feels that the barrel material of the 30th rifle may not be as good as Mosin Nagant, and it is difficult to say whether the 38 big cover has changed, at least at this stage.

If we think about the problem purely from the perspective of improving the shooting accuracy, there is no need to reduce the caliber of the rifle bullet to 6.5mm, and the only explanation is that in the whole design, because of the lack of materials and processing accuracy, reducing the caliber to reduce the recoil and stress change is the only way to meet the design requirements.

In other words, it should be said that it is a very clever design that must adopt such a caliber design, and a small caliber change can solve all the problems that need to be faced in industrial production.

It is further deduced from this that if the caliber of the 30 and 38 rifles is to be increased to 7.62mm, it is necessary to solve various problems in industrial production first, because the bolt design of the 30 and 38 rifles is better, the parts are fewer, and the structure is simpler.

As far as the industrial level of the 1904 rifle is concerned, if the caliber of the 30 rifle is really increased to 7.62mm, then I am afraid it will be tragic, whether it can be mass-produced is a problem, and the difficulty faced is probably worse than that of the Lee Enfield rifle.

It turns out that there are awkward things everywhere in this world, and they can't stand scrutiny at all, so what do you have to think of your opponent so smart?

On the other hand, doesn't the army want to solve the problem of low rifle power? If they don't want to solve it, why do Xiao Yue's soldiers have to take out the bullets and rub them when they are idle?

Song Biao reassembled the two rifles, sat by the fire and continued to ponder these awkward things, pulling the bolt and tossing, contrasting, and muttering in his heart.

Modern manual rifles have developed to the peak level during the First World War, and the margin for improvement since then is very low, in this generation of classic rifles, the advantages of the Mosin Nagant rifle are easy to mass produce, low cost, low rate of fire, dull, reliable, accurate shooting, Lee Enfield rifle is the highest rate of fire, the surname can be convenient, and the cost and production difficulty is also the highest, the Mauser rifle is a more balanced one in all aspects.

The 30 and 38 rifles are relatively different, and the number of parts and the difficulty of processing are reduced through a very special design, making them suitable for the current industrial level of the company, with straight ballistics, the lowest recoil, and higher shooting accuracy.

Song Biao has disassembled the bolt of the 30 rifles, and has a more comprehensive understanding in his heart, the bolt of the Mauser rifle has not been disassembled, but he can roughly remember the structure of the Mauser bolt, as far as his personal feeling, the processing difficulty of the 30 and 38 rifles is lower than that of the Mauser rifle in the same period, and there are actually two parts missing, which are due to the advantages of design, and the processing difficulty of the Mosin Nagant rifle is the lowest among all classic rifles.

Processing difficulty and manufacturing accuracy are two different concepts.

The machining accuracy of the Mosin Nagant rifle is not lower than that of the Mauser rifle and the Lee Enfield rifle, the difference is that the bolt design of the former is cumbersome, there are more parts, and the design of a single part is simpler, and the vast majority of the bolt work and lathe can be produced, while the bolt parts of the Lee Enfield rifle and the Mauser rifle are more complex and require more experienced machine tools to work, or more expensive special machine tools.

It can be seen from this that the current industrial level of this and Russia is just like this, especially the Japanese version, don't think that the fact that the aircraft carrier and Yamato-class battleship were built later means that its overall industrial level is very high, do you think, since the Meiji Restoration, the Japanese have spent 30% of the political axe financial expenditure on military spending all year round, how much capital can it invest in the development of industrial technology?

Because the book in the modern history of 60 years has maintained a very high military expenditure, the military industry before World War II is also extremely developed, there are a large number of designers and sophisticated work, as well as a huge scale of production equipment, but in the machine tool industry is completely the world's third-rate level, the vast majority of machine tools are imported from the United States, Germany, France, Britain and other countries, World War II said that can build first-class aircraft carriers and battleships, but can only manufacture third-rate machine tools is also a fact, first of all, in the field of theory and industrial research in the machine tool industry, Secondly, it was thrown out of the United States and the Soviet Union in the three fields of motors, special machine tools and combined machine tools.

Machine tool this kind of thing, even if it is a traditional machine tool seems very simple, there is a large number of mechanical calculations and analysis in it is basically the category of Xueba, at this time if you want to use your own machine tool to produce rifles, I am afraid that even millimeter-level accuracy can not be maintained, and it is normal to make a rifle caliber between 6mm and 7mm.

The reason for this is very simple, we can also produce Intel chips by introducing a production line from the United States, but can we build that production line? Please, we even make Pentium-level chips and single-chip microcomputer production lines are imported, these production lines are the derivatives of combined machine tools and CNC machine tools in the second half of the 20th century, we basically can't afford to toss, many of the theories in it can't even be tossed by Song Biao's father, the old Xueba, really let Song Xueba study, don't expect a "major achievement" within ten years, unless it is the dynasty that gathers all relevant scholars to tackle key problems together.

In the words of Song Xueba, only talking about the industrial field, the overall level of our machine tool industry is 20 years away from the United States, but in the theoretical field, we are at least 50 years behind, the former can still catch up, the latter basically can't catch up, there is no hope in 30 years, because no one in China is fucking engaged in theoretical pre-research, are copied from the theoretical model of the Americans and Germans more than ten years ago.

The development direction of the machine tool industry has always been to gradually reduce the dependence on people, so that ordinary workers can also produce better products, which is the characteristics and direction of the industrial revolution, including the development of CNC machine tools, not that the processing accuracy of traditional machine tools is not as good as CNC machine tools, but the production efficiency and difficulty are completely different, even very different.

During World War II, it was said that the instinct was to use traditional machine tools, special machine tools and skilled craftsmen to manufacture Yamato-class battleships, but the speed was simply turtle speed, while the United States was like dumplings like ultra-fast manufacturing, the key to this lies in the large-scale application of combined machine tools and special machine tools in the United States, as well as the extraordinary achievements of the United States in the field of machine tool theory.

The United States can build its own machine tools, but it is said that it cannot be imported from the United States, and the roads imported from Germany, Britain and France are also strangled, and the tragedy of a rising industrial star is here.

Through the adjustment and expansion of the machine tool industry, the United States can not only blow up destroyers, aircraft carriers, and battleships on a large scale, but also upgrade one level after another, as long as the theory and design are improved, the product line can be replaced immediately, for specialized new products and new parts to provide large-scale special machine tools, combined machine tools, large-scale explosive production, and it can only be modified on the basis of World War II, the original design and production framework has not changed, and dare not change, a change can not be large-scale processing, As soon as it changed, it became a turtle speed production.

There is no doubt that the backwardness of the machine tool industry is one of the main reasons for the failure.

After the end of World War II, the large-scale and rapid development of the machine tool industry and the motor industry was the use of the Cold War and the United States' strong support and technology transfer, and on the other hand, it was also the catch-up after examining the reasons for the defeat in World War II.

As the son of a scholar, as a guy who pondered UFO power system conjectures in junior high school, Song Biao knew very well that the industrial level of the capital during World War II was not high, but it looked scary, of course, China's industrial level in this period was even more frustrated.

The industrial level of Ben during the Russo-Japanese War was placed in front of Song Biao's eyes, which can be seen through the rifle in his hand.

Didn't all the guns of the Type 31 field guns, the main force in the Russo-Russian war, be imported from the Krupp company? Even the gun mounts were imported from the French company Schneider, and the Tokyo Artillery Factory was only responsible for assembly.

The industry is not terrible at all.

Just like North Korea, Myanmar and the like, when they see that China can build computer chips and the world's first-class supercomputers, they think that China is so powerful, and China can also build aircraft carriers, Shenzhou, and Beidou .......

Looking at the problem from the perspective of the son of a scholar, two words can represent all Song Biao's moods - Nima!