Again about whether the tank needs a 152-mm gun

Disputes and discussions about whether tank The 152-mm gun has been underway for more than a dozen years, but almost all of them boiled down to the fact that this caliber should be a worthy response to the growth in the security of NATO armored vehicles. If you drive the corresponding query into the search engine, then most of the materials found on this topic will be full of in fact the same fashionable phrases about the “meter of burnt armor”, elongated sub-caliber and even nuclear shells, as well as about how the crew of the American Abrams is in a panic leaves his car when he sees a Russian tank with a huge barrel.
steel sledgehammer
However, with the start of a special military operation, the rhetoric began to change dramatically with the transition to a "high-explosive fragmentation spectrum of tasks." Suddenly (not for everyone) it turned out that tanks do not always fight against tanks, although here it would even be more appropriate to say - rarely. This trend was clearly defined by the example of the Arab-Israeli war of 1973, when the number of lost tanks from anti-tank systems amounted to 50% of the total losses, and only 22% fell to the share of enemy tank fire. The remaining 28% were divided among themselves aviation, hand grenade launchers and mines.
In general, there were no massive tank raids in Ukraine. But there were quite expected constant assaults on the positions of Ukrainian units, entrenched in settlements and fortified areas. In this situation, tanks increasingly, although not always, began to play the role of a steel “sledgehammer”, quite typical for themselves, knocking out enemy manpower hidden in trenches, buildings and structures.

In connection with these circumstances, some experts have once again raised the question of the advisability of arming tanks with 152-mm guns, whose shells are superior in their high-explosive and fragmentation action to the serial 125-mm gun. Sometimes it even reaches the point of absurdity. Thus, a military historian and researcher artillery and armored vehicles Shirokorad in one of his recent materials gave a completely fantastic thesis that tanks should be equipped with barrels from the SAU "Msta-S", while making them interchangeable with the "native" 125-mm guns, providing a large angle of elevation of the gun and introducing into the automatic loader the ability to use propellant charges of different powder weights. How to implement all this in the volumes of a tank, at least theoretically - we will leave on the conscience of the author.
Theoretically, a 152 mm gun would have looked much more advantageous than a 125 mm caliber, but with great conventions.
There is no doubt about the high-explosive power of large-caliber shells. For clarity, you can make a simple, although not completely correct comparison with Msta-S ammunition. Thus, in the 3OF45 "Vicarious" projectile for self-propelled guns, the explosive weight is 7,65 kilograms, while the 125-mm 3OF26 high-explosive fragmentation projectile contains 3,4 kg of explosives. The incorrectness of this comparison lies in the fact that 152-mm high-explosive fragmentation projectiles of a smoothbore gun, and it is this type of gun that has real prospects for installation on a tank, will carry a slightly lower explosive charge due to the tail, which eats away the useful length of the projectile, as well as , possibly a higher muzzle velocity than the self-propelled gun. However, the difference is still obvious.

Against fortifications, as well as in urban areas and industrial areas, a 152-mm high-explosive fragmentation projectile will be much more useful. In particular, this applies to those cases when it is simply impossible to smoke out an enemy constantly moving around the building with aimed shots. The experience of such local conflicts as the war in Syria and Chechnya shows that sometimes the enemy left no choice but to collapse the floors or entire entrances of the building with shell fire in order to destroy it. The same, in general, was repeated at the Azovstal Mariupol plant, when workshops and other buildings had to be ironed with almost everything that was at hand.
But the openly located manpower of the enemy still remains a higher priority, in the fight against which it is not the shock wave that comes to the fore, but the fragmentation field from the detonation of the projectile. Due to the larger hull size and explosive charge, 152 mm ammunition produces more lethal fragments, and their dispersion is wider. The advantage over 125-mm shells, although not overwhelming, is significant.
Already done or not yet?
So, is the traditional domestic tank caliber already all or not yet?
Fortunately, the caliber has not yet become obsolete, but requires significant modernization and innovation. High-explosive fragmentation shells themselves are outdated, the anti-personnel capabilities of which are far from being at a high level. The fact is that shells of this type are actually a hollow steel blank into which an explosive is poured. Due to the fact that their body is made in a cylindrical shape, the bulk of the fragments formed during the explosion scatters perpendicular to its axis. Considering that the tank is not a self-propelled gun, and often works on the principle of “I see - I shoot”, firing along a flat trajectory, up to a third of all fragments fly into the ground and into the sky without causing any damage to the enemy.

Sometimes, in order to somehow hit the target, experienced tankers are forced to fire with a ricochet, when the trajectory of the projectile is chosen in such a way that when it hits the ground, it flies up and detonates at a certain height. The situation is the same with infantry sheltered behind parapets or in trenches.
From the memoirs of the tankers, one can cite a characteristic episode of the Chechen campaign. At some distance, the enemy is located, covered with a parapet. They fired one shot at him from a tank - flight, the second shot - short flight. It's good that a tree grew near the enemy position. They gave him high-explosive fragmentation in his crown. He detonated on the barrel and doused a hail of fragments of the entrenched militants. So the target was hit.
The solution to this problem should be the mass production of projectiles with ready-made submunitions. One of them is 3OF82 Telnik. It is a deeply modernized version of the classic 125-mm high-explosive fragmentation projectile, in the bow of which, by reducing the weight of the explosive to 3 kilograms, a block with ready-made striking elements in the amount of 450 pieces is installed, as well as an electronic contact-remote fuse. It can be used by almost all modern main tanks of Russia after being equipped with the appropriate equipment.


Scheme 3OF82 "Telnik". Source: btvtinfo.blogspot.com
Although Telnik can also work as a regular OFS, its main advantage is the possibility of an air blast. To do this, the distance to the target is measured, and the induction programmer automatically introduces the desired delay into the fuse. A detonated projectile strikes enemy manpower in closed and open positions with fragments from its own hull and ready-made submunitions. The anti-personnel capabilities of the novelty are about 6–8 times higher than those of a conventional 125-mm high-explosive fragmentation projectile, so that the “urgent need” for a large caliber fades into the background. However, taking into account all the nuances of the introduction of 152-mm guns, including the reduced tank ammunition, “background” is too mild a wording.
Also, the question of introducing a thermobaric projectile into the tank ammunition was repeatedly raised. Based on the experience of using it in various military conflicts, it is known that ammunition of this class in terms of high-explosive impact is superior to classic ones with high-explosive filling. An example here is the RPO-M "Shmel-M", the warhead of which, with a diameter of 90 mm and a mass of fire mixture of 3 kg, provides an explosion with a power of 5–6 kg in TNT equivalent. Therefore, a projectile created within the framework of a 125-mm caliber can be at least half as effective as a 152-mm high-explosive when firing at buildings and structures. Whether they will do it or not is a question, but the prospects are interesting.
The caliber is far from dead, and its future is clearer than that of the 152 mm, which is hindered by production, financial and structural issues.
Supporters of 152-mm guns very often cite as an example an experienced tank "Object 292", which is a deep modernization of the "eighties" with the installation of a high-pulse 152-mm LP-83 gun. The special advantages of this machine are allegedly ease of execution and the absence of the need for alteration of the chassis. But the fact is that for this tank it was necessary to design a new turret with a rear niche, change the location of the ammo racks and change the gun loading mechanism. As a result, all this turned out to be so unbalanced that the frontal part of the tower had to be scalded with rectangular counterweights. In addition, the design of the turret ring was actually re-created, since the old one could not withstand shock loads.

"Object 292". Visible aft niche and massive counterweights in the frontal part of the tower. Source: commons.wikimedia.org
As a demonstrator of the fact that they were able to cram what seemed impossible on the surface - yes, but is it possible to apply this in a series, given all the nuances - no. And if you look at it from the point of view of modern realities, when a panoramic thermal imaging sight / observation device cannot be installed on a tank in order to save money, such adventures of a dubious nature in the form of installing a larger caliber gun on the T-72 or T-90 look completely fantastic .
Also, with a high degree of probability, it can be argued that the 152-mm gun will not be used in the T-14 "Armata", at least in the version of the tank that is now. From open sources it is known that this tank is equipped with an automatic loader with a vertical arrangement of shells, so when installing a combat module with a gun of this caliber, problems may arise: shells of a larger elongation simply do not fit in height, which will entail changes in the dimensions of the hull, or to use a new type of mechanized laying. The consequence of both will be a change in the design of the combat vehicle, although the tracked platform itself is truly universal.
Also, do not ignore the reduction in the ammunition of the first stage, located in the automatic loader of a tank with a six-inch gun. For example, in the T-14 "Armata" it can be 25 percent, when compared with the standard 125-mm 2A82-1M.
No less difficulties for large caliber and mass. So, for the most promising 152-mm 2A83, it reaches five tons, while for 2A82-1M it is 2700 kg. And all this against the background of a reduced barrel resource, which, with the current capabilities, is quite difficult to bring to the level, although not standard, but acceptable 500-600 shots.
Final World
What can be concluded from all of the above? The advantages of 152-mm guns are really undeniable, both in terms of high penetration of armor-piercing shells, and in anti-personnel business. One way or another, evolutionarily we will come to this anyway. But later, probably not in this decade, and maybe not in the next. And certainly not within the framework of the tanks that we have now.
At the moment, the capabilities of 125-mm guns are far from being fully exhausted. When using modern ammunition, they are really enough for everything from defeating tanks and ending with the fight against enemy manpower. The 2A82-1M gun mounted on the T-14 tank can serve as a demonstrator of this point of view. High muzzle energy in combination with an arsenal of new sub-caliber, cumulative and fragmentation (with ready-made striking elements) shells can significantly extend the life of the caliber. And most importantly - to reduce the cost of production and operation, than a six-inch can not boast.
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