Originally, I came to the capital just to see the T-72, in the field of domestic tank engineering, this is the first time I have held an advanced tank in my own hands, although I have seen it before, but it is impossible to come into contact with it every day, and do whatever you want.

However, once you really get in touch with it, if you want to leave, it will not be easy, especially in the tank design institute, there will be meetings almost every day, and after the meeting, Qin Zhenhua has to be invited to participate.

If you don't go, it will be too faceless, a small person like Qin Zhenhua was called over to attend the meeting by a group of experts in the field of tank design, where is there any reason not to go? And once you go, there are many times you can still gain something.

When everyone was in a meeting, Qin Zhenhua could still think of the content in these meetings, which had a perfect effect on his own second-generation tank, so every time he wanted to leave, he felt that it was time to go back, and finally stopped.

On this day, there was a lively discussion in the conference room again.

"Our tank is still pursuing a low appearance, and the internal space of the hull is limited, so we believe that the automatic loader is one of the necessary equipment, so we should use the fire deployment scheme of the T-72 tank." It was Mu Guijin who spoke, and in the past few days, he has been mapping the automatic loader in detail, and the more he looks at this automatic loader, the more satisfied he is.

"No, we believe that from the perspective of the potential of armor-piercing shells, the whole ammunition has an advantage over the whole load, so we suggest that it is best to use the whole ammunition, and we have been studying the 120 mm tank gun for more than ten years, and the performance has gradually matured, and we should not give up all the current scientific research results and re-engage in the 125 mm tank gun." Xie Huimin of the Second Machine Factory said.

How to choose a tank gun, the top has been handed over to Qin Zhenhua, but Qin Zhenhua only intends to compare, and does not plan to give a decision, so when everyone talks about this matter, both sides are back and forth, constantly expounding their respective concepts.

The Second Machine Factory was originally made of artillery, so now, the 120mm tank gun is close to maturity in their research and development, and they really don't want to tear it down and start over because they have a T-72, and all their previous efforts will be in vain.

This is unacceptable.

"Yes, moreover, now we have the process of self-tightening of the barrel, etc., the bore pressure in the barrel is getting higher and higher, and the performance of our current 120 mm tank gun completely exceeds that of the current Soviets." Nie Jianqiang followed.

For tank guns, when the barrel caliber is constant, it is still possible to increase the power by adding more propellants, that is, larger shell barrels.

However, the more propellant there is, the greater the pressure in the chamber, which requires the barrel to be thicker, otherwise it will explode.

In this way, the weight of the barrel is larger.

At this time, if you want to change, you have to realize it from the process, using electroslag remelting steel and self-tightening of the body tube, all of which are to prepare for increasing the chamber pressure and reducing the quality.

In this regard, we can compare the domestic 100 mm rifled gun and the introduced L7 105 mm rifled gun, obviously the latter has a thicker barrel, but the mass of the people is lighter, and at the same time, the bore pressure is greater, which is the benefit of advanced technology.

Now, these technologies have begun to be gradually mastered by the second machine factory.

"Take our current 120mm smoothbore gun as an example, when it was designed, in 1967, the chamber pressure was 430 megapascals, and by the mid-70s, the chamber pressure had increased by 25 percent, and at that time, it was already about the same as the current Soviet tank gun."

At present, the Soviet Union's 125 mm smoothbore gun, codenamed 2A46, this smoothbore gun, the maximum chamber pressure is only 550 megapascals, this figure is not high at all.

"In order to match the second-generation tank and the storm tank, we have developed a third-generation 120-mm tank gun, and at the same time, due to the advanced technology, we plan to develop the final product, the fourth-generation 120-mm smoothbore gun, on the basis of a 20% reduction in mass, the maximum chamber pressure will be close to 900 megapascals." In Xie Huimin's mouth, these data blurted out.

The maximum penetration depth, the maximum firing range, and the ejection speed, this 120mm tank gun of your own side is definitely the most powerful!

In particular, it is 50 times the caliber, and now the Leopard-2 tank gun is only 44 times the caliber, so if you compare, the 120 mm tank gun you are developing can be said to be the first in the world.

Of course, if you say it now, it is estimated that it will make people laugh, and he didn't mention it, but in his heart, that's what he really thinks, we have already made the world's first tank gun, and now, you have to change the caliber again? Don't play like this.

The research and development of a tank gun is not easier than the research and development of artillery shells, and it is necessary to make a reasonable balance between the strength design of the body barrel, the strength check and the safety factor according to the yield strength of the material, the bore pressure curve, and many other factors. At the same time, in order to ensure safety, the diameter and outer diameter of the bore are left with a certain processing allowance when self-tightening, and the selection of the medicine chamber must also go through many shooting tests.

The Second Machine Factory is an artilleryman, and in this regard, they are an authority, and they already think that the 120-mm tank gun at hand is already the best, so they have always insisted on using this tank gun.

"Zhenhua, what is your opinion?" Wang Tianming asked Qin Zhenhua.

Qin Zhenhua, who was attending the meeting, waved his hand: "I have no opinion now." ”

"You kid, just say a few words, what are you afraid of, now Zhang Lao and they are not here, and it is not a stereotyped meeting." Wang Tianming said.

"Cough, cough, I'm not afraid of anything, I'm not afraid of heaven and earth, I've offended people all over the world, am I still afraid of saying the wrong thing?" Qin Zhenhua said: "It's just that I know everyone's own thoughts, now, how to achieve the best balance." ”

It is indeed a pity that the 120-mm tank gun, which has been developed by the side for so many years, suddenly gave up, and how to solve the problem of the arrangement of armor-piercing shells brought about by the division of shells for 125-mm tank guns?

These are still undecided in my mind.

At this moment, suddenly, the door was pushed open, and a middle-aged man hurriedly walked in, his face a little ugly.

"Oh no." He came to the front of Qin Zhenhua, and at the same time, he also said to everyone: "The first batch of 20 69 tanks we exported were rejected by the exporting country, and they even protested to us, saying that our products, and the tested products, have completely different performance. ”

The impact of this incident will be quite far-reaching, and everyone's face will change greatly after hearing it.

Qin Zhenhua only frowned: "How could we export the first batch of 20 vehicles?" Isn't it 200 cars exported together? ”