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Proposed mod 1
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Proposed mod 2
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Proposed mod 3
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Proposed mod 4
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We Need Something Better
This is a discussion and proposal for using mods on HEAT shells for the T58 heavy tank, which was proposed for implementation in July 2023 on the War Thunder forum and passed in April 2024.
The implementation proposal for the T58 heavy tank and reference images are at the link below.
Proposal for implementation of T58 heavy tank
Pictures and materials
Inside under the turret With turret Gun and autoloader Autoloader drum magazine
Internal structure
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Overview
Information about the T58 heavy tank is generally publicly available, but there is currently little information about its shells.
As for its armament, it is said to be equipped with a 40-caliber 155mm T180 tank gun as its main armament, and can fire HE shells (type unknown, maybe M107 or M101?), T267 HEAT shells, and T152 HEP shells, but there is no detailed information about the T267 HEAT shells, which will likely be the main shell among these, and all that is known is the muzzle velocity, weight, and maximum penetration. However, to implement it in War Thunder, information on other explosive types, TNT equivalent values, HE effect penetration, etc. is also required.
Therefore, it is necessary to use a mod to supplement the missing data, but since War Thunder is a game that emphasizes historical accuracy, it is preferable to use a mod based on existing shell data. Therefore, I propose this.
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Consideration
We propose several patterns and variations to make the data closer to the historical facts.
The data to be calculated are weight, type of explosive, TNT equivalent, and HE effect penetration.
The weight and TNT equivalent due to the difference in caliber will be scaled to the same as a 155mm caliber shell based on the cube law.
Pattern A: Mod based on rifling-stabilized HEAT shells used around WW2
Pattern B: Mod based on rifling-stabilized HEAT shells used during the Cold War or more recent than the Cold War
The data for the T267 HEAT shell written in the document is a muzzle velocity of 826m/s, weight of 29kg, and maximum penetration of 406mm.
The documents are as follows.
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Details of various patterns
Pattern A
A1: Weight 35.4kg, Explosive type RDX/TNT, TNT equivalent value 5.96kg, HE effective penetration 49mm (Mod based on Japanese 57mm Type 3 HEAT round)
A2: Weight 41.9kg, Explosive type H.5, TNT equivalent value 7.65kg, HE effective penetration 58mm (Mod based on German 75mm Hl.Gr38C)
A3: Weight 33.2kg, Explosive type H.5, TNT equivalent value 6.39kg, HE effective penetration 52mm (Mod based on Finnish 114mm hkr42/C)
A4: Weight 41.6kg, Explosive type Pentolite, TNT equivalent value 5.08kg, HE effective penetration 41mm (US 105mm M67 HEAT-based mod)
A5: Weight 27.4kg, explosive type A-IX-1, TNT equivalent value 5.53kg, HE effective penetration 45mm (mod based on Soviet 122mm BP-460A)
A6: Weight 29.07kg, explosive type A-IX-1, TNT equivalent value 5.09kg, HE effective penetration 41mm (mod based on Soviet 152mm BP-540)
Pattern B
B1: Weight 34.78kg, explosive type Composition B, TNT equivalent value 3.24kg, HE effective penetration 36mm (mod based on French OCC 105 F1)
B2: Weight 20kg, explosive type Composition B, TNT equivalent value 3.95kg, HE effective penetration 38mm (mod based on US 152mm M409)
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Candidates
Among the multiple candidates, the A5 and A6 were calculated to have values close to the historical T267 HEAT shells in terms of weight. Therefore, these two are considered to be the preferred base for the mod.
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Change of explosives
Both of these shells were used by the Soviet Army and used explosive A-IX-1. However, Octol and Composition B explosives were used in the United States at that time, and they may have been used in the T267 HEAT round. Therefore, we will replace the explosives in A5 and A6 with Octol and Composition B to calculate the TNT equivalent and HE effective penetration.
A5: The original 122mm BP-460A contained 2.2kg of explosives. Based on the formula 155/122≈1.27 1.27^3＝2.048, Mod1 contains about 4.5kg of explosives.
4.5kg of Octol is equivalent to 7.11kg of TNT, and Composition B is equivalent to 5.85kg of TNT, so the HE effective penetration is 55mm for Octol and 48mm for Composition B.
A6: The original 152mm BP-540 contained 3.8kg of explosives. Based on the formulas 155/152≈1.02 1.02^3≈1.06, Mod 2 would contain approximately 4.03kg of explosives.
4.03kg of Octol is equivalent to 6.37kg of TNT, while Composition B is equivalent to 5.24kg of TNT. Thus, the HE effective penetration is 52mm for Octol and 43mm for Composition B.
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Proposal and Survey
Proposal and Survey
In the survey, the Octol version of A5 will be referred to as [Proposal Mod 1], and the Composition B version of A5 will be referred to as [Proposal Mod 2].
The Octol version of A6 will be referred to as [Proposal Mod 3], and the Composition B version of A6 will be referred to as [Proposal Mod 4].
The data table for the T267 HEAT shell mod is easy to read:
Proposed mod 1: Weight 29kg, explosive amount 4.5kg, explosive type Octol, TNT equivalent value 7.11kg, HE effect penetration 55mm, HEAT penetration 406mm
Proposed mod 2: Weight 29kg, explosive amount 4.5kg, explosive type Composition B, TNT equivalent value 5.85kg, HE effect penetration 48mm, HEAT penetration 406mm
Proposed mod 3: Weight 29kg, explosive amount 4.03kg, explosive type Octol, TNT equivalent value 6.37kg, HE effect penetration 52mm, HEAT penetration 406mm
Proposed mod 4: Weight 29kg, explosive amount 4.03kg, explosive type Composition B, TNT equivalent value 5.24kg, HE effective penetration 43mm, HEAT penetration 406mm
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If you have detailed information or blueprints about the T267 HEAT round, or if you have obtained them, please feel free to post them in the comments section. I would also be happy if you could suggest a better mod.
If you feel that this information is sufficient, please feel free to pass it on to the developer.