M358 APBC if it didnt deform has enough power to defeat 371mm RHA
It should be unsurprising why it could achieve 135mm at 60 degrees of penetration
The guy just pulls numbers out of his ass.
One time the pen should be 161mm, but other times 180, and so on.
This guy needs to chill out.
120mm M358 APBC
4.3in at 2000 yards at 60 degrees
That’s 109mm at 1828m at 60 degrees
AP Slope Modifiers from WWII Ballistics: Armour and Gunnery
T/D Ratio = Thickness divided by Shell Diameter
109mm / 120mm = 0.91 T/D ratio
AP Slope Modifier at 0.91 T/D ratio at 60 degrees
That’s 2.65
109 x 2.65 = 289mm
120mm AP shell needs 289mm pen at 0 degrees
To penetrate 109mm at 60 degrees
So yes this round could penetrate well over 300mm
Cuz that’s 289mm at 1828 meters
But since the 0 value is calculated from 60 degrees, an angle at which non capped AP shells do not deform, the 0 value represents the M358 penetration of the round if didn’t deform at 0 degrees either
Oh and yes you probably have noticed the experimental APDS round for M103 as well in the source.
495mm @ 1000 yards.
You sent sources for like 10% of your claims, so it is still not very good.
I know, and it matches the calculator suggestion I’ve made.
Thats cuz I’m using 2 pounder AP as reference
40mm AP Round
Penetrator: 2lb 6oz 3dr weight (1.08kg)
Velocity: 2600ft/s (792m/s)
Penetration: 90mm
This is 2 Pounder AP penetration at 0 degrees when the round doesn’t deform and I use it as reference to calculate other AP rounds penetrations if they didn’t deform.
I use 57mm M70 AP. 2.85 kg at 899 m/s with about 141mm of pen. That puts the 2 pounder at 86mm. About 4% difference, so the results should be similar. That still doesn’t explain M358 reaching 395mm. It’s just not possible.
The 105mm Type 2 is different, since it’s an uncapped APHE. If you use Soviet APHE as a reference, the Type 2 would be around 215mm at 1000 meters per second.
I never wrote 395
US steel has like the highest quality for AP rounds compared to other nations
Using 2 Pounder as reference the M77 AP will penetrate 204mm if it didn’t deform.
According to this, M77 AP penetrates 191mm after it deforms.
If I use M77 AP as reference after it deforms for 57mm AP I get this
That document uses 250-300 BHN armor. The pen curve shows little or no deformation of the round. If the round deformed, the curve would flatten out as the velocity decreased.
T33 APBC
97mm at 55 degrees
T/D ratio = 1.078 (97/90)
1.078 T/D at 55 degrees
That’s 2.185 slope modifier
97 x 2.185 = 212mm
My 2 Pounder AP as reference rates it 215mm
Your calculator would rate the T33 only around 202-204 or so
No, it’s actually 210.
In that case there’s only 2% difference between our figures
That’s reasonable. No one size fits all calculator will work with every round ever fired.
You guys have strayed OFF TOPIC!
My bad, just trying to point out that the data he posted is no good. I don’t see the 105mm clapping T54s.
Type 5 105mm
16kg shell (0.2kg HE filler)
So 105mm AP , 15.8kg penetrator at 1000m/s
I get 303mm which means for you it’s 297mm with 2% less.
To defeat 100mm at 60 degrees
100 / 105 = 0.95 T/D ratio
0.95 T/D at 60 degrees = 2.67 slope modifier
That means you need 267mm vertical pen to clap T-55’s 100mm thick upper plate at 60 degrees
And Ho-Ri production 105mm AP has 297-303mm of vertical penetration (if it didn’t deform)
So if gaijin fixed Ho-Ri Production
The gun would be clapping T-54,T-55,T-62 and IS-3 tanks
You’re comparing solid AP to APHE.
200g inside a 16kg shell is nothing
Anyways AP, APHE. The slope modifier applies either way
It’s not just the weight of the filler, it’s the structure of the shell. German data puts the Soviet 85mm APHE at around 130mm of pen. That would put the Japanese Type 2 at around 215mm. I haven’t seen any data on the Type 2. Was it was well made round? How was the steel quality? Is there any penetration data?