Listening to Bai Yi's words, Chen Yaoyang was excited for a while, but it dimmed in a blink of an eye, because he suddenly thought of a question, so he immediately asked: "The lethality of the little devil's 6.5mm pointed rifle bullet is no problem, but the problem is that the lethality is only at close range, basically within 200 meters, beyond this distance, its power is no different from the round head bullet, and it is precisely because of this that when we counterattack in Burma, we will press little Japan to fight." Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ”

Chen Yaoyang is a personal participant in the Burmese counteroffensive, and the devils he faced are also elite divisions in the Japanese army, so he still has a lot of say in the actual use of ammunition, as he said, the Japanese army's 6.5mm pointed bullet is certainly lethal, but its actual range of action is not large, and its power will be greatly weakened if it exceeds a certain distance.

Bai Yi naturally knew this, so he smiled, turned the pen in his hand to the bottom of the 6.5mm pointed bullet sketch, and then lightly nodded: "The problem you said is here!" ”

Chen Yaoyang was stunned when he heard this, and immediately looked at the sketch that Bai Yi was referring to, and looked at it for a long time without seeing the problem, so he shook his head suspiciously, and then looked at Bai Yi suspiciously: "Aren't all bullets like this?" What could be the problem? ”

"Are you thinking about it?" Bai Yi did not answer directly, but asked meaningfully: "Is it true that all warheads are shaped like this?" ”

"This ......" was asked by Bai Yi, Chen Yaoyang was stunned for a moment, and immediately reflected, slapped his thigh and shouted: "Yes, why didn't I think about it, machine gun bullets, machine gun bullets are not improved from rifle bullets, that's right, the bottom of the warhead of machine gun bullets is indeed different, it is a kind of ...... Ship-like structure. ”

"Is that so?" While Chen Yaoyang was speaking, the pen in Bai Yi's hand had already been drawn on the paper, and when Chen Yaoyang reflected, next to the sketch of the 6.5mm pointed rifle cartridge, a warhead sketch with a shape different from the traditional rifle cartridge appeared, Chen Yaoyang nodded again and again: "Yes, yes, that's it, the warhead of the 7.92mm machine gun bullet of the Min 24 heavy machine gun." ”

Chen Yaoyang's Min 24 heavy machine gun is a Chinese imitation of the German MG-08 Makqin heavy machine gun, because it was produced in 1935, that is, in the 24th year of the Republic of China, so it was named the Min 24 heavy machine gun, although the model of this firearm is not as good as the MG-34 general-purpose machine gun equipped by Germany in the same period.

Compared with the new heavy machine guns of other countries, it is also slightly old, but the 7.92mm machine gun cartridge used by it is one of the few new types of ammunition in the world that adopts aerodynamic optimization at that time, and because of this, in the subsequent War of Resistance against Japan, the Min 24 heavy machine gun can often suppress the Japanese Type 92 heavy machine gun.

Chen Yaoyang looked at the bottom of the ship-shaped 7.92mm machine gun bullet, and then looked at the 6.5mm pointed-nosed bullet on the ordinary tail, frowned thoughtfully, then raised his eyes to look at Bai Yi, and asked not very confidently: "Could it be that the root joint is in the tail of this ship?" ”

"That's right, the root is at the tail of this ship." Before Chen Yaoyang's words fell, Bai Yi nodded firmly: "Don't look at it as a simple tail treatment, the aerodynamic principles contained in it are not simple at all......

As he spoke, Bai Yi used the pen in his hand to draw two simple vortex charts on the two bullets, put the notebook sideways on his chest, and pointed to the two bullet fluid sketches with the pen and continued: "When the general bullet is advancing at high speed in the atmosphere, its tip can quickly and effectively 'push away' the air, but when the bullet pushes away the climate, a small vacuum will form behind the warhead, and the atmosphere will compensate and merge with normal pressure.

The air in front of the bullet is pushed away, and the atmosphere will be affected by the vacuum and preferentially fill the part of the vacuum in the process of backfilling, that is, the air chases the vacuum and fills it in the way of north inhalation.

Therefore, the air will continue to show a vortex load, and pass through the atmosphere in such a shape, and the atmosphere behind the object will form a 'pulling force', because the air vortex will also interfere with the object itself, especially the projectile with inertia as kinetic energy, its kinetic energy reduction efficiency is the fastest, especially most flat bullets, and the lack of long-range lethality is related to this, on the other hand, the 7.92mm machine gun bullet ......"

Before the words fell, Bai Yi's pen had already pointed to another completely different fluid sketch, and continued: "Because the diameter of the tail end of the warhead is smaller than the caliber, the vacuum area space behind the warhead is also correspondingly reduced, which means that the atmosphere merges along the shape of the warhead instead of being pushed away and then merges.

There is almost no 'pull' interference when the warhead passes through the atmosphere, so naturally there will be no eddy current interference warhead. Because of this, the bottom warhead of this type of ship type is like a hot knife cutting butter through the atmosphere, cutting the air in the front section, rather than pushing it away with brute force! ”

"This ...... Unexpectedly, it was a small shape change that contained such a complex principle. After listening to Bai Yi's explanation, Chen Yaoyang's eyes were a little straight, as he said, he never thought that the aerodynamic knowledge contained in the small bullet warhead was so profound.

So that even he, a high-achieving student who graduated from Southwest University, heard a little cloudy, no way, Chen Yaoyang's major is mechanical, not aircraft design, and it is normal to not be exposed to esoteric aerodynamic knowledge, but Chen Yaoyang doesn't think so, since there are shortcomings, they must make up for it, whether it is aerodynamics or fluid mechanics, as long as they can be used in the future, they must learn and understand, otherwise how can they talk about technology to serve the country?

So Chen Yaoyang calmed down, and when he raised his eyes again, his eyes were even hotter than before, Bai Yi looked at it, and couldn't help but chuckle in his heart, but before he could speak, Chen Yaoyang preemptively said: "Chief Bai, don't say anything, today I finally know why you are always interested in developing a new type of intermediate power bullet a few days ago, I am indeed too ambitious, and I am a little too confident, I can't even understand the aerodynamics, how to talk about developing high-performance bullets, Chief Bai, if you don't think I'm troublesome, Teach me aerodynamics today! ”

As soon as he heard this, Bai Yi suddenly became a head and two big, he originally wanted to solve the trouble, so he explained the principles of the bullet so thoroughly, if Chen Yaoyang can understand it best, he will directly follow the broad road paved by himself to complete China's own intermediate power bullet.

If you don't understand, it doesn't matter, you know the difficulty and go back to charge it yourself, anyway, Bai Yi's ears can be cleaned, but Bai Yi has calculated a lot, and forgot to count Chen Yaoyang's tenacity, you must know that when I first met Chen Yaoyang, this guy was not even afraid of a dozen loaded firearms around him in order to understand the technology he didn't understand, so what else could he care about and retreat?

Now it's a good thing, a trouble has not been solved, and an even bigger trouble is coming, Yi Bai Yi immediately shook his head and refused: "Where do I know what aerodynamics, this thing is also when I was fighting Germany with the Soviet army, I listened to a captured German expert, and I know so much, no more, there is really nothing." ”

"It's enough to listen to German experts talk about this, not to mention, I believe that when Chief Bai entered the hinterland of Germany with the Soviet army, he saw more than one German expert, as long as those people tell you one or two cutting-edge principles, it is enough for us to use for life!"

Chen Yaoyang's words can be described as righteous and strict, but the cunning gaze that flashed in his eyes revealed his true thoughts, although Chen Yaoyang is obsessed with all kinds of technology, so that he is a little simple and cute, but his people are not stupid, on the contrary, they are very smart.

Since he met Bai Yi, whether it was the use of improvised items to manipulate artillery for accurate shooting, or the in-depth understanding of Soviet-style artillery skills, or the application of the Misnay-Shalding explosion effect on the road to defeat the bandits, Bai Yi's technical ability has long made Chen Yaoyang doubt what Bai Yi's true identity is.

Although Bai Yi kept saying that he occasionally learned from captured German officers and experts when he was fighting with the Soviet army, Chen Yaoyang knew that he could explain the obscure theory in simple terms only by relying on one or two words from an expert who was not in the village or behind the store?

Chen Yaoyang is also a high-achieving student who graduated from Southwest Associated University, although he is not as good as the current returnees with super high gold content, but he also knows the complexity and difficulty of understanding the theory, because he admires Bai Yi at the same time, he is also very curious, curious about how he is an ordinary Soviet soldier, how can he know so much?

It's just that I'm not sure yet, so there is no transitional indication, until today Bai Yi explained the principle of bullet aerodynamics in a simple and easy to understand, Chen Yaoyang was sure that his suspicions were correct, you must know that aerodynamics is at the forefront of the current field, not ordinary people can master, and because of this, Chen Yaoyang is no longer retaining his attitude, expressing it in a very obscure way.

What kind of person is Bai Yi, he was a personal essence in his previous life, and the body he inherited in this life is not a good class, the combination of the two phases is about to become a monster, and he still can't understand Chen Yaoyang's words, and it is also said that he is a high-achieving student of Southwest Associated University, his IQ is absolutely online, and he can come up with theories at every turn, and he doesn't feel anything from the perspective of his previous life, but from the perspective of the current people, the top is a rare cutting-edge technology, if one or two are okay, it is strange that there are more than one and no one is suspected.

"The steps are too big, it's a bit of a pull, and the trouble is getting bigger and bigger!" Bai Yi sighed unconsciously in his heart......