The Army limit from this test is consistent with my estimates (within the margin of experimental error):
Also, this might come in handy:
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Seems to match what I calculated.
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But why 103mm for M61 APC?
It should be like 90mm.
I remember that one British tests that said if you put a cap on an AP round, it needs 50fps more velocity for the same penetration.
Whenever I made some quick and dirty DeMarre calculation, I merely considered the APC penetrator but I should have accounted for energy loss from the cap deformation.
The cap cushions the impact but it also absorbs some energy from the APC round before it hits the armor.
There’s just no way that M61 would pen 103mm when M72 does 109mm.
Edit: on the topic of cap effect:
This is especially high quality data, as every ballistic limit for capped and un-capped shell was established against the same plate, eliminating a major source of uncertainty from variable ballistic resistance of nominally homologous armor plates.
The effect is small but consistent.
It shows that BL for capped shell is about 2% higher. 2% of BL at 2500fps is 50fps, so this is consistent with the british data, but would be more accurate for lower velocities than simply adding 50fps.
I have posted this information previously here.
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Gaijin uses the total round weight. If I use just the penetrator weight, it comes out to around 90mm.
Well, take the penetrator and maybe adjust the k factor, or some other way to add some energy loss to the penetration process.
But 90mm should be around the historical value. Of course M61, M62 and M82 have very round noses, that probably decrease penetration efficency against flat armor.
The game has it at 104mm. I wasn’t trying to change things too drastically.
What’s drastic about realistic armor penetration values? I thought that was the point 🤔
Within the context is the very simple system Gaijin has implemented.
I wonder why they didn’t split the two M82s. M82/E and M82/L would be cool and it could actually feel like progression, as well as not making the M36 too powerful at too low of a BR. If you really wanna be pedantic, M82/44 and M82/45 would have worked (as in the years, I believe that’s the introduction year). Still upset T33 hasn’t been buffed. I get that they want to use it as a “stock” shell but like, M77 already exists. Use that one. Let T33 be the heavy round it is supposed to be. Then maybe we wouldn’t need the M36B2 with M348 to reliably kill Panthers, and the M36 could get T33 as it’s heavy killer.
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Gaijin has decided the US isn’t allowed to have the same ammo selection as other nations. I’ve asked repeatedly why that is the case but get no answer.
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