Hu Qinghua's arrival marked the formal formation of the joint research group, and also the official start of the entire artillery shell modification and development; in fact, Lu Jiadong's plan is not uncommon for future generations, it is nothing more than the bottom-row grenade that the armies of various countries are generally equipped with, not to mention the later generations, even in the current Western world, the bottom-row grenade is not a profound secret.

Because Sweden, a Nordic military industrial power, began to study the relevant theoretical research of the bottom row grenade as early as the 60s, and successfully developed the 105mm bottom row grenade in the mid-70s.

The level of middle-class engineers and technicians is not low, but the country has been closed for so many years for various reasons, so that military technicians do not understand foreign cutting-edge military technology at all, but this does not mean that their foundation is very poor, take the bottom-row grenade that Lu Jiadong is currently promoting, although the people in the joint research team did not know what the bottom-row grenade was before Lu Jiadong put forward this concept, but after Lu Jiadong's systematic explanation, these people quickly understood the essence of the bottom-row grenade.

It was almost nine o'clock in the night, and the members of the joint research team did not go back to rest, but gathered in the technical department of the Wanshan Factory, since the establishment of this group, this has become the base camp of the team members, and the members will gather here from time to time to discuss various key technologies about the modification of artillery shells.

At this time, Lu Jiadong Lu Jiadong was pointing to the schematic diagram of the flow of the wake area of the bottom-row grenade on the blackboard, explaining the technical details of the bottom-row grenade:

"25%~30% of the bottom row grenade is mainly obtained by reducing the contribution of the bottom resistance, and the proportion of the bottom resistance of our ordinary ammunition to the total resistance is 25% to 30%, so the purpose of this modification is to strive to increase this proportion to about 45%, of course, we can increase the proportion of the bottom resistance by installing an exhaust device, but there are other ways to increase the proportion of the bottom resistance, such as"

Saying that, Lu Jiadong picked up the cup next to him, and after taking a big sip of water, he continued:

"For example, you can increase the radius of curvature and length of the oval head! In addition to this method, you can also increase the proportion of bottom resistance by shortening the length of the cylindrical part, increasing the length of the stern section, and reducing the stern angle of the stern!"

Lu Jiadong said while drawing on the flow diagram of the bottom row grenade wake area, while the other members of the joint research team sitting opposite held their own notebooks, carefully recording every sentence Lu Jiadong said and drew every picture, and Yang Limin was the same, but at this time, he put down the notebook in his hand, looked at Lu Jiadong standing in front of the blackboard and said:

"Xiao Lu, in addition to the method you said to increase the bottom resistance, we have calculated, and we have also concluded that the range extension effect of the bottom row has a great relationship with the number of Mach numbers of the projectile flight, and the critical point of this value is Mach 2.5, that is, 2.5 times the speed of sound, that is, the number of Mach number of the projectile flight during the working period of the bottom row device is greater than 2.5, so the muzzle velocity of our bottom row grenade cannot be less than 850 m s, but I heard that the rough speed of our Type 66 152mm plus howitzer is only more than 600 m s, will this be?"

Although Yang Limin's words were not finished, everyone present knew what he meant, so they all frowned, because Yang Limin's calculation skills were known to everyone present, and the value he came up with was also the result of his repeated calculations over the past few days.

However, when everyone else was at a loss, Hu Qinghua, who was sitting in the corner, showed an indifferent smile on his extremely arrogant face:

"Lao Yang, you don't have to worry about this, although the muzzle velocity of the Type 66 152mm howitzer does not meet the requirements, we still have the Type 59 130mm cannon, its muzzle velocity is more than 900 meters per second, which has far exceeded the requirements of this value, so there is no problem at all!"

"But after all, the caliber of the Type 59 130mm cannon is too small, and the power of the shells is not as powerful as the shells of the Type 66 152mm howitzers, and according to intelligence, Vietnam may get the Soviet 2S7 type 203mm artillery, if the Type 59 130mm shells are modified, in the future confrontation, our artillery has no advantage in caliber at all!"

As soon as Hu Qinghua's voice fell, Qiao Junfeng, who was sitting in the front row, said, although Qiao Junfeng's words were very sharp, Hu Qinghua did not feel uncomfortable, because after many days of running-in, the members of the joint research team have a deeper understanding of each other's personalities.

For example, Hu Qinghua, when he first came, many people were not optimistic about him, thinking that he had conflicts with Lu Jiadong before, and he was very arrogant, but after a period of understanding, these people found that although Hu Qinghua was still very arrogant, he was extremely serious in doing things, and he had to strive for perfection in all technologies.

And in the work he is similar to Yang Limin, but also a pounce on the master who can't get out, sometimes he can't even take care of eating and drinking, and staying up all night is even more commonplace, it is Hu Qinghua's serious and responsible attitude towards work and the advanced technology knowledge he has mastered, so that the people of Wanshan Factory and the joint research team gradually change from far away to close to Hu Qinghua, and then from close to familiar, and finally from familiar to familiar!

And Hu Qinghua is the same, when he first came, he was indeed a little uncomfortable, except for Lu Jiadong to support him, no one around him was optimistic about him, once upon a time he also regretted it, thinking about whether it was right or wrong to come to this Wanshan factory! Just when he was confused, Lu Jiadong's words made him completely change:

"The people of Wanshanchang only admire people with real skills, and they don't believe that you can walk around and take a look!"

It was Lu Jiadong's words that made Hu Qinghua begin to pay serious attention to everything in Wanshan Factory, and he found that Lu Jiadong's words were not wrong, no matter how young you are in Wanshan Factory, as long as you have real skills, from the leaders to the employees will admire you, on the contrary, no matter how old you are and how senior you are, as long as you have the ability to do nothing, no one will pay attention to it in the factory, but there will not be many people to follow it!

It is precisely this kind of atmosphere that has formed a good atmosphere of loving technology and learning in Wanshan Factory, which also makes Hu Qinghua completely immersed in his own related work, so as to gradually be recognized by Wanshan Factory, and at the technical seminar within the joint research team, he also went from obscurity to fighting with others for his own technical views, but these debates are limited to the technical category, and the people in the joint research team still admire Hu Qinghua's technical ability in private, and also admire Lu Jiadong's vision.

Of course, such technical debates have been carried out many times, and a lot of problems have been solved in them, but there is another problem that has not been settled for a long time, that is, the selection of modified shells, specifically the dispute between 152mm and 130mm, which is represented by Qiao Junfeng, most people feel that 152mm grenades should be selected, the reasons are both sufficient and simple, that is, 152mm caliber is large and powerful!

However, a small number of people led by Hu Qinghua strongly advocated the 130mm grenade, and the reason was also very tenable, that is, the 130mm cannon is currently the longest-range artillery of our army.

However, this problem did not bother Lu Jiadong for a long time, originally today Lu Jiadong wanted to use this technical seminar to express his opinions, but he did not expect Yang Limin's numerical calculation to lead the unresolved matter again, and Hu Qinghua did not back down after Wang Chuanchen finished speaking:

"Although the Type 59 130mm cannon is a little less powerful, it has a range advantage, so I still reserve my opinion!"

Seeing that the two were at a stalemate again, the eyes of everyone present all turned to Lu Jiadong in front of the blackboard, and Lu Jiadong met everyone's hopeful gaze and glanced at Hu Qinghua with a consistent indifferent smile:

"I agree with Hu Gong!"

"Xiao Lu, the power of a 130mm grenade is not comparable to a 152mm grenade, choose" Listening to Lu Jiadong's words, Qiao Junfeng, who was sitting in the seat, couldn't help but look at Lu Jiadong opposite anxiously, but before he finished speaking, Lu Jiadong stopped him:

"Director Qiao, think about it, why is the long-range artillery that the Soviet Union assisted Vietnam according to intelligence called long-range artillery?"

"This" Listening to Lu Jiadong's question, Qiao Junfeng didn't know how to answer for a while, but Lu Jiadong just smiled when he saw this and continued:

"It is because of its long range, and the longest-range artillery of our army is only the Type 59 130mm cannon, if we increase it by more than 30% on the basis of its existing maximum range of 27 kilometers, it is possible to exceed 35 kilometers, so that in terms of range can compete with the Soviet aid artillery shown by intelligence, even if our caliber is small and the power is insufficient, but it can be offset by relying on the huge numerical advantage of our army, after all, even if the Soviet Union assists Vietnam, it will not be able to obtain a huge number of long-range artillery in a short period of time!

But if we use the 152mm grenade to modify, the power is there, but the maximum range of the Type 66 152mm howitzer is only 17 kilometers, even if the range is increased by 30%, it can only barely reach 22 kilometers, but the kinetic energy of the Type 66 muzzle is insufficient, and the 30% increase in range is only theoretical, and it is difficult to achieve in practice, so even if it is modified, it is impossible to meet the existing needs of the troops!"

"I agree with Xiao Lu's opinion! If you want to modify it, you can modify it with a 130mm grenade!" As soon as Lu Jiadong's voice fell, Yang Limin raised his hand to support Lu Jiadong, and with Yang Limin taking the lead, everyone present raised their hands to express their support for Lu Jiadong, until finally Qiao Junfeng raised his hand, and the matter on the selection of shells was passed.

But at this moment, I heard a burst of eager footsteps at the door, and then the door of the technical department was pushed open, and Chen Zihao walked in with a rather strange thing:

"Jiadong, the computer you want has arrived!"

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