Thermal expansion and contraction is one of the basic laws of nature, and when exposed to sunlight, the temperature of the outer surface of the gun barrel is uneven, which will cause the barrel to bend.

This bend sounds very mysterious, like stir-frying at home will pollute the atmosphere.

In fact, this bending is still very powerful, for example, take the 105 mm tank gun in front of you, if the temperature difference between the top and bottom is 20 degrees, the barrel is bent, which can cause an error of 8 secret positions, which may not be clear to ordinary people, then, in conversion, at a distance of one thousand meters, it will bring an error of eight meters.

Eight meters! The length of the body of a tank, such that, because of the uneven heating of the upper and lower parts of this barrel, it is already able to create a gap that cannot hit the target.

In a hot zone, the difference between up and down is not a big deal, even if the temperature difference is relatively small, only five degrees up and down, it can also cause an error of 1.3 meters, and at a range of 1,000 meters, there will be an error of 1.3 meters.

This error is not small, for tanks, it is required to hit every shot, and it is not possible to hit a distance of 1,000 meters, which is obviously not possible.

In particular, the longer the barrel of a tank gun, the more prominent this problem becomes.

At present, there is no qualified thermal sheath in China for the time being.

This thing, as simple as it is said, is a thin aluminum alloy plate, wrapped in a circle, wrapped around the outside of the tank, and wrapped the tank inside, that is, a sleeve for the tank. After wearing a condom, I feel more confident.

However, this sleeve is not simple, it must ensure the manufacturing process, itself is double-layered, but also let the barrel evenly inside, so that between the inner and outer layers, form an air interlayer, just like a double-layer thermos flask, the outer layer of aluminum plate may be heated inconsistently, but the inner layer of aluminum plate heating must be uniform, between the inner layer of aluminum plate and the barrel can form a uniform temperature air interlayer, so that the body tube is heated evenly, to ensure consistent deformation up and down, reduce the curvature of the body tube, and improve the shooting accuracy.

It is difficult to make the aluminum alloy plate into such a shape, which depends on the heat treatment process of the aluminum alloy plate, which has been tried in China, so that the plate is seriously deformed after heat treatment, and welding cracks will appear.

Therefore, at present, there is no good solution to this thing for the time being, and now, looking at the barrel of this tank of others, it is a simple and easy method.

The advantage of aluminum alloy is that it is relatively light, but it is difficult to process, and before the breakthrough in processing technology, then we have to think of other ways.

Unexpectedly, it was the Israeli tank in front of him who solved the problem first with the local method.

People use asbestos!

Asbestos is also an excellent thermal insulation material. Wrap the outside of the barrel directly with an asbestos blanket, and then fix it with a clamp on the outside, although it looks a little bulky, but it can still solve the problem!

Looking at this thing, Qin Zhenhua's eyes also lit up, the layman looked at the excitement, the insider looked at the doorway, and after he went back, he could use this way to make do with it first.

In fact, asbestos thermal sheath is not a new thing, as early as World War II, the Germans' tank artillery hit far and accurately, which also has the credit of thermal sheath, later, at the end of World War II, the tanks produced by various countries also use this kind of thermal sheath, including the 100-man captain tank in front of him, with asbestos thermal sheath.

Naturally, the Israelis used this thermal sheath when they replaced this tank with a 105-mm tank gun.

Qin Zhenhua's eyes were shining, looking at the barrel of the gun, and at this time, Mr. Tal also looked over and looked at Qin Zhenhua: "The tank you exported, although it is still the original 100 mm tank gun, but the armor-piercing ability has been greatly improved, I don't know what method you use, can you introduce it to us?" We are very interested, and if you do, we can also give you the complete process of producing the thermal sheath of this barrel. ”

Since this is an exchange, we cannot always look at each other's but also our own, and this is called an exchange.

And this tank gun is not something that you need to keep secret, it is exported in large quantities by your side, so even if you say it now, it doesn't hurt.

Qin Zhenhua said with a smile: "We have reequipped this tank gun with sub-caliber armor-piercing shells, compared with the previous full-caliber armor-piercing shells, the performance has naturally improved a lot, and there is no problem in penetrating the chief's armor, after all, homogeneous steel armor is not good, if the other party uses this kind of explosive reactive armor again, then we can't do anything." ”

As he spoke, Qin Zhenhua pointed to the brick-like devices on the tank, which were fixed on the surface of the main armor in front of them, and looked like Tetris, which was the explosive reactive armor called the jacket made by the Israelis.

Asbestos thermal sheath, this thing, just look at it, no need to introduce it, the inside is an asbestos blanket, and the outside is a clamp, it's as simple as that, the big guy came this time, in fact, he came for this explosive reactive armor.

Hearing Qin Zhenhua's question, Mr. Tarr smiled: "Are you interested in this?" As far as I know, many countries feel that it is impossible to successfully research this kind of armor, so they have already abandoned it, including the Soviet Union. ”

It is also not correct to say that explosive reactive armor was studied by the Israelis, after all, this thing has actually been available for a long time, and at the beginning, it should have been first conceived by the Soviets, but the most important of them was the obtuse explosive, which the Soviets have not been able to come up with, and then they gave it up.

There is no doubt that Israel was the first to be used in actual combat.

This has something to do with their experience, just a few years ago, during the Yom Kippur War, the Israeli armored forces suffered heavy losses, destroying more than 300 tanks, so they decided to develop such a special protection.

"Of course, if you want to improve the armor protection of the tank, this is a very effective way, and we are actually developing similar reactive armor in China, codenamed FY-1, perhaps, we can communicate this reactive armor on both sides." Qin Zhenhua said: "The principle in our country is like this..."

FY-1, that is, the meaning of reaction-1, the domestic naming rules, naturally in Chinese pinyin, now, the opponent's tank is being refitted, so, on the armor of the tank, there are special shelves for reactive armor, some have been installed in place, some have not.

Qin Zhenhua picked up a piece of the other party's reactive armor from the side, like a big chocolate, and then pointed, gestured, and explained.