Chapter 1169: Big selling point

Tan Zhenhua saw that Minister Li Zheng Meimei, who was holding up a teacup with a serious face, took a sip. Before he could swallow it, he flushed suddenly, and then burst into a violent cough, and Zhu Yusen at the other end wished you great wishes. The Chief Master was using his best efforts to prevent himself from squirting out, but seeing his flushed face, it should be quite hard to hold back.
However, Wang Zheshan spread his hands innocently, "Huh? Did I say something wrong? What are your expressions?"
Li Liqing finally stopped his coughing fingers. Wang Zheshan said, "Pharaoh, you have to tell the occasion clearly when you are joking. We are in a meeting here. Also, if the venue is full of old guys like us, it will be fine. Comrade Xiao Tan is there, don't teach the kids badly..."
Hey, I said Minister Li, I really can’t count as a child... Tan Zhenhua vomited in his heart, and at the same time he put on an innocent expression and asked, "Professor Wang, what you just said. The sentence "Don't be afraid of short and thick, but afraid of long. "What do you mean? Can you explain it?"
Wang Zheshan's face showed an extremely exaggerated expression of surprise and replied: "Mr. Tan, I heard that you have been studying in the U.S. for these years. U.S., such an open country, you don’t know what this sentence means. ...Cough cough, okay, let me explain. For the special ammunition of the "tail stabilized shelling armor-piercing projectile", the "length-to-diameter ratio" is a hard indicator to measure the quality of the ammunition. Well, the specific reasons need to be A very complicated physics explanation, but a brief description of the principle is: under the same kinetic energy, the smaller the contact area, the greater the pressure on the obstacle, and the greater the destructive force generated, and the obstacles need to be penetrated. The less gong you have. Is this understandable?"
Tan Zhenhua nodded with joy, which is not difficult for a man in science to understand.
"In APFSDS, oh, also the English abbreviation of "tail stabilized shelling armor-piercing projectile", in the process of penetrating the armor, the main factors affecting the penetration depth are the length of the penetrating rod (the core), the aspect ratio, the material, and the Speed, um, I have to explain again, APFSDS is simply a long metal rod. Its killing effect on tanks is not the explosive explosion of traditional artillery shells, but pure kinetic energy shells. The shells are penetrating the armor. According to the formula "Q=FS", (Q is heat, F is power, and S is friction distance), it is known that the greater the strength, the greater the penetration distance, the greater the energy. The generated heat energy Q is also greater. Q divided by the specific heat capacity of the metal of the car body C is the generated temperature T. This temperature T melts the metal. After the metal is melted, it becomes a liquid and spreads in the direction of the warhead. After penetrating the armor, it causes a hot metal jet to kill the occupants and equipment in the vehicle.
By analyzing this principle, we know that in order to get a greater penetration depth, we need to increase the speed of APFSDS as much as possible, reduce its diameter as much as possible, and at the same time, in order to more accurately maintain the trajectory of the projectile in flight and reduce the The energy loss in the process, and because in the process of penetrating the armor, the front part of the projectile is constantly fragmented and worn due to intense friction, which is equivalent to continuous consumption, so we need to make the shells as much as possible. Longer, the longer the better. In this way, the aspect ratio has become an important indicator of APFSDS. In fact, by tracking the international fashion trend, we can see that with the advancement of technology, it is meeting the rigidity requirements of the rod. Under the premise that APFSDS is being made thinner and longer, for example, the metric M735 projectile just mentioned has a projectile diameter of 31.68 mm, a projectile length of 305 mm, and a length-to-diameter ratio of 9.6. This should be regarded as The first generation of APFSDS in the United States, and according to reliable information, this model is actually rarely used by Americans, and it is basically prepared for export sales. The model for personal use is M744, which uses a depleted uranium rod. Public information shows that it is With a diameter of 25 mm and a length of 475 mm, the length-to-diameter ratio is 14. Comparing these data, it can be found that this bomb is longer and thinner. Of course, its penetration parameters must be much better than M735. "
After being popularized in this way, Tan Zhenhua finally understood the true meaning of Wang Zheshan’s words "Don’t be afraid of stubbornness, but of slenderness". It turned out that for the natural enemy of tanks, the
tail stabilized shelling armor-piercing projectile APFSDS
is a special projectile. , This sentence is a simple summary of its performance requirements.
It’s just that Professor Wang Da’s expression is really imaginative...
Following Wang Zheshan’s words, Tan Zhenhua then asked:
Then Professor Wang, how is the current level of APFSDS in our country? Can it catch up with the level of the American M375?

After hearing this question, Wang Zheshan obviously hesitated. Obviously, this data is confidential. However, after consulting Li Liqing and Zhu Yusen with his eyes, he still gave Tan Zhenhua a simple explanation: "In fact, we introduced It is the metric M735 bullet, but it is limited by the material and processing capacity at the time. After imitating it, there is a certain gap between the performance of the original product. Of course, with the improvement of our metallurgical materials and processing capabilities in recent years, the performance It has improved to a certain extent."
Tan Zhenhua understands his vague remarks very well. The implication is that it is still not up to the level of U.S. exports.
This also explains the reason why Pakistan Railways’ evaluation of the
Storm 2
prototype is lower than the competing M60A3.
After nodding, Tan Zhenhua pondered for a while before asking again: "Then Professor Wang, can I ask a layman's question?"
"Huh? You ask?"
"Let's just talk about our gun, can it play M735 rounds? Basically, it is from a family, I think it should be possible?"
His question immediately caused a "buzzing" discussion in the house. Wang Zheshan hesitated for a while before repliing: "Actually, it is possible, and we have done related tests. But Comrade Xiao Tan, what do you mean by that? Yes……"
Tan Zhenhua clapped his hands and laughed: "You can fight, you see, isn't this a big selling point of our tanks? Not only can it fight our own ammunition, but it can also be compatible with NATO ammunition of the same caliber. This is a huge battlefield. Advantage!"
Before he finished his words, Li Liqing couldn’t wait to applaud:
Comrade Xiao Tan really has extraordinary business acumen. It’s really a very good idea to say this. Our flexibility is almost inferior, but the price is cheap. They have strong flexibility, but the price is also expensive, which is equivalent to giving the Pakistan Railways an additional choice. This should be able to convince them."
Fang Weixian hesitated and said, "Although Comrade Xiao Tan said it is good, the fundamental problem of this gun has not been solved. Even if the bomb can be explained, the problem of too long body management is..."
"Well, I, a layman, also have some immature ideas about this issue of body management. Every expert here, see if they are right."
"What do you think."