Chapter 332 Big eyes stare at small eyes

While thanking Gao Zhendong for the new materials, Professor Luo laughed and complained about Professor Liu: "Haha, this old Liu, he didn't even share the good stuff he got, and he even set an ambush."

Gao Zhendong had no way of responding, and the two of them just laughed it off.

Professor Luo had a clear direction on rifle grenades, so he turned the page and talked about rifle grenades.

"Director Gao, the idea of ​​hanging grenades on guns that you mentioned to Professor Liu last time has now been officially launched as a sub-project. Coincidentally, this matter has also been assigned to me. So in this regard, there are many things I need to ask you for advice."

Gao Zhendong was delighted when he heard this. It was amazing how fast they moved.

"I don't deserve your advice, let's discuss it."

Professor Luo's next words made him feel a little embarrassed: "I made a preliminary simulation of a 35mm high-speed grenade and calculated its situation. The results are good and unsatisfactory. The good thing is that the tactical indicators are very good, and it can effectively replace the role of 40~50mm rifle grenades. In addition, the ballistics, service, ammunition carrying capacity, and reaction speed are far superior to the former. But..."

As soon as the word "but" was uttered, Gao Zhendong knew that the main point was about to come, and perhaps there was something ill-considered about his suggestion.

"But the recoil is very strong. People can barely bear it, but the gun may not be able to bear it. It needs special consideration and reinforcement. In addition, the wall thickness of the high-speed grenade launcher itself and the connectors that need to be greatly strengthened, the weight of the whole system is a bit excessive. If it is used in a dedicated launcher, it is easy to solve, but if you want to hang it under the gun, it is a bit difficult."

This is a problem. Gao Zhendong has considered whether humans can withstand it. The light sniper grenade he saw in his previous life had a large recoil, but judging from the live ammunition design, people could still withstand it. Since it can be equipped in large quantities, it means there is a reason for it.

However, he put aside the impact this would have on the entire system.

Professor Luo's next words completely dashed his idea of ​​using high-speed grenades: "I have also communicated with the comrades who use it. They are very interested in your idea, but they also proposed an idea. In addition to direct fire, they also want indirect fire. The range does not need to be too far, but it must be there."

A typical Party A who wants this and that.

That would be easier to deal with. There is no need to worry about the balance between speed and recoil. If you just want direct fire, you can still make choices between bullet weight, initial velocity, trajectory, and recoil to find a suitable balance.

The requirement for indirect shooting does not require a very long range, so Gao Zhendong does not have to worry about calculating and finding a balance point. In this matter, it is not good to be too fast.

Then let’s go with plan B.

Gao Zhendong smiled and said, "That's easy. You can use the high and low voltage transmission principle."

Then he raised his head and looked at Professor Luo, but found that Professor Luo was also looking at him and did not speak.

The two of them stared at each other for a while, and Gao Zhendong asked in confusion: "Professor Luo, do you have any questions?"

Professor Luo looked at him in confusion: "Director Gao, no problem, please continue."

Gao Zhendong spread his hands and said, "That's all. Just use high and low voltage."

Professor Luo stretched his neck and said, "Then you need to tell me the principle of high and low voltage transmission."

Gao Zhendong: "Don't you know the principle of high and low voltage transmission?"

Professor Luo: "How would I know the principle of high and low voltage transmission?"

Gao Zhendong then understood, damn, he was too careless, it turns out that people who are doing this these days have no idea what the high and low voltage emission principles are. It's not that they can't do it, but that they simply don't have this concept.

Come to think of it, it makes sense. Given our emphasis on firepower, it was not until 91 that we developed the first gun-mounted grenade based on the high- and low-pressure firing principle. You can imagine.

Gao Zhendong patted his head: "This is my fault, haha."

Professor Luo looked at him and it seemed that he really didn't expect that he didn't know the principles of high and low voltage. It seemed that Director Gao overestimated us. This matter seemed, a bit embarrassing?

The other person was communicating with me on an equal footing, and I felt that I was on the same level as him. However, I never expected that my level was so poor that I could not keep up with his rhythm and pace.

Professor Luo took the initiative to apologize: "I'm sorry, Director Gao, I really don't know what the high and low voltage transmission principle is. I hope Director Gao can teach me more."

Gao Zhendong smiled and said, "Do you remember the Japanese grenade launcher, Professor Luo? While the range was guaranteed, the launching mechanism was relatively simple and light."

Seeing Professor Luo's expression of sudden enlightenment, Gao Zhendong explained the principle of high and low pressure launch again. After all, Professor Luo might know about the phenomenon of the Japanese grenade launcher, but he might not understand the principle.

High and low pressure launch is simple to say. It is to confine the propellant in a small enclosed space. After it is ignited, the gunpowder gas is slowly sprayed out through a small hole to propel the projectile forward.

For example, if a balloon explodes all at once, it will cause a loud noise and you can feel a shock, but if the air is slowly released through the inflation port, the same amount of gas will cause a much smoother explosion.

This technology uses high-pressure gas to do the work, but the projectile is pushed through a low-pressure process, so it is called high-low pressure launch. It can effectively smooth the peak of chamber pressure, disperse the energy over a longer period of time, reduce chamber pressure, and lower the requirements for the launch mechanism. In the past, our high-pressure grenade launchers not only had thick tubes, but also had reinforcing ribs, because the high-pressure grenade chamber pressure was high.

At the same time, high- and low-pressure launches have a longer working time and are relatively more efficient, requiring less propellant.

As for recoil, it is basically impossible to reduce it by high or low pressure firing. Those who have studied momentum know that it mainly depends on the initial velocity of the projectile. However, since the initial velocity has been reduced due to inflection, the original recoil will naturally be smaller.

If you want to eliminate the recoil, that’s easy. Just eject matter backwards like a recoilless gun. This is called the balanced ejection principle.

Of course, although both recoilless guns and rocket launchers eject matter backwards, they are different, and that’s a long way to go.

After listening to this, Professor Luo looked remorseful and said, "Director Gao, to be honest, I have handled many grenade launchers used by the Japanese, but I never expected to come up with such a set of principles."

When talking about the scientific research work during this period or even twenty or thirty years later, a phrase often said was "lack of theoretical foundation and weak technical strength", which is the absolute truth.

Gao Zhendong didn't say anything. It was difficult to respond to this question.

He just smiled and said, "Professor Luo, in this case, we just need to make the place where the propellant is placed thicker and design the gas channel. In terms of the design of the ammunition, you can consider choosing one with a shell or without a shell."

Wow, Director Gao is so talented, is there any choice?
Professor Luo looked curious: "Director Gao, please speak."

"For the one without a shell, since there is no need to eject the shell, it can be designed as a muzzle-loading shell, which reduces tactical movements and increases the rate of fire. The disadvantage is that the muzzle-loading method requires a shorter launch tube. In this case, the launch tube will be thicker because the energy is relatively concentrated and the chamber pressure will be higher. As for the one with a shell, you basically just need to think about it the other way around."

To put it bluntly, from the perspective of the launcher, the difference is the Russian GP-25 and the American M-203.

Professor Luo thought about it for a long time but couldn't make up his mind, so he simply gave up thinking about it. I recorded both and let the user choose.

Hearing his idea, Gao Zhendong smiled. He could guess which one the user would choose without even using his brain - the one with more powerful firepower.

I drew a diagram of the structure of the two projectiles for him, and Professor Luo couldn't let it go.

Professor Luo returned from Gao Zhendong's place in the morning, and found the user's representative in the afternoon. He showed Gao Zhendong's two designs for gun-mounted grenades to the user's representative.

The user representatives looked at this with happiness beyond words.

"Professor Luo, your design is so good. I didn't expect that you had already finished the principle design just after we made the request."

Comrade Lao Luo quickly clarified: "No, comrade, I didn't come up with the principle design. I consulted with comrades from other units and they came up with it. I can't think of this thing."

If it's not your own credit, you can't just claim credit for it. You have to make it clear, otherwise it will be embarrassing if other people hear it.

The user representative looked as if he had suddenly realized something: "Oh, him, I understand, I understand, no matter who it is, this thing is really good."

How can it be bad? It can fire directly or indirectly, attack light armor or counter infantry. Its range and accuracy far exceed those of a grenade. When facing enemy machine gun fire points, it has strike firepower that can be used at any time.

At that time, each squad will be equipped with two guns, and the ammunition will be carried separately by the whole squad, so that the enemy can be fully fed. In the eyes of the users, anything that can explode is a good thing.

In the past, there had never been such a prosperous war.

Look at the indicators again, surprise!

"We only want a range of 200 meters, right?"

"Comrade, this is the case. We calculated it on the spot. With this design, the range of anti-infantry is 400 meters and anti-armor is 100 meters without any problem."

The range of anti-armor shooting should be shorter, because anti-infantry shooting is to hit a large area, while anti-armor shooting is to hit a point that may move. If it is too far away, it is not that it cannot be hit, but that it cannot be hit.

The indicators of equipment are never just a single value, it is a comprehensive consideration, just like the effective range of a pistol does not exceed 50 meters, it is because of the word "effective". If you can't hit the target, it is of no use no matter how far you shoot.

The user representatives feel happier: "I want this, I want this, let's get it done quickly."

Professor Luo pointed to the last two pages and said, "Comrade, the comrade over there provided two projectile designs. It's hard for me to decide here. I need you to clarify it."

The user representative scanned it, pointed at the diagram of the pre-installation solution, and said firmly: "I want this!"

When Professor Luo saw this, he remembered what Director Gao said before they left, and sighed inwardly that Director Gao understood them too well. This choice and this action were exactly the same as what he said.

(End of this chapter)