ZiS-2 ATG: Was it a good design?

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Peasant
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ZiS-2 ATG: Was it a good design?

Post by Peasant » 22 Jul 2020 11:18

Because of its extremely high (990m/s) muzzle velocity it had a relatively short barrel life, and making long, thin barrels was complicated and therefore expensive in man-hours, while because of the inferior design of soviet ammunition of the time they couldn't fully exploit the potential of such weapon.
Yes, it would have theoretically had a better accuracy but most AT guns of the era had lower muzzle velocity and did just fine.

I believe that since 45mm Mod 32, 37 AT guns were pretty useless against vehicles with 50-60mm of vertical armour, the next higher tier soviet ATG should've been designed to counter those threats. To defeat 55mm/30° at 1000m would require striking velocity of 675m/s at 1000m, to achieve which the BR-271 shell would need 790 - 830m/s muzzle velocity, depending on which firing tables we trust.

While fighting against heavy tanks would be relegated to yet another tier of ATG, possibly on the SP mount, of 85mm caliber based on the AA gun.

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Re: ZiS-2 ATG: Was it a good design?

Post by Art » 22 Jul 2020 18:19

Military in April 1940 wanted "a gun of 50-60mm caliber capable of penetrating 50-60 mm of armor at a distance of 1000 meters". ZIS-2 happened to be a considerably more powerful gun.

Peasant
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Re: ZiS-2 ATG: Was it a good design?

Post by Peasant » 08 Apr 2021 10:31

Source: from the book "Tankovaya Mosch SSSR, Part 3" chapter 16.3 "To kill the Tiger":
Еще одним фактором, сдержавшим выпуск 57-мм противотанковых пушек в 1943 г., стало то, что освоенные в серии 57-мм бронебойные снаряды БР-271 первого образца еще не вполне удачно работали по гетерогенной броне толшиной 60 мм и более при попадании в нее под углом свыше 15-20°. Поэтому уже весной НКБ были выделены средства по разработке и освоению новых бронебойных снарядов, и в апреле новый сплошной снаряд с «локализаторами» БР-271 СП, а также остроголовый БР-271К «английского типа» были приняты на вооружение, но их серийное производство было начато лишь с конца мая 1943 г.
Another factor that was slowing down the re-introduction of the 57mm AT gun in 1943 was that the original AP shells currently in service had subpar performance against 60mm face hardened armour when the angle of impact was over 15-20°. Which is why in the spring of the same year NKB have dedicated funds to the development and setting up production of the new AP shells. Already in April the new solid shot with fragmentation grooves BR-271SP as well as sharp tipped shell of the "english type" BR-271K were accepted into service and their production began at the end of May 1943.
Not much to add here, other than the fact that "english type" was a usual soviet designation of the time for solid shot so the BR-271K was actually a solid shot, unlike I thought before.

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