Most of the Type 2 Ho-I tanks built had the short 75mm Type 99 tank gun, in 1943 one tank was tested with an experimental high-velocity 57mm gun. This Tank was basically first gen prototype which later became Chi To and Chi To late. Built on the Ho-I platform equiped with the new Experimental 57mm Anti Tank gun(larger version of the Type 1 47mm gun) which was able to penetrate up to 100mm with HEAT shell.
(No irl images can be found atm. Only written docs remain)
(IJA Experimental 57mm anti-tank gun)
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you like the nato? i mean i havent got it so i cant speak for it efficiency in taking out sherman and jumbo but i do love big gun
No
It’s basically half truck with a AT gun
Considering that 57mm has 21% more penetration power and on top of that a lower ballistic coefficient as a result of bigger and heavier shell compared to the 47mm gun, meaning it will maintain its energy better over distance than a 47mm shell, the fact it has only 5mm more penetration at 500m is very Suss…
Type 1 47mm has 673m/s at 500m with ballistic coefficient of 6000
you can verify this here:
705.4m/s at 400m
648.5m/s at 600m
With 6000 ballistic coefficient i get 673m/s at 500m
So then…
if we subtract the HE filler from he 47mm APHE shell, the penetrator is roughly 1.49kg heavy
At 500m it has 673m/s velocity and a penetration of 64mm.
If we use this as reference in demarre equation…
57mm APHE, 2.7kg with 30g HE filler. 2.67kg penetrator. 800m/s velocity
Demarre equation result is 101mm @ 0m
Penetration of the 57mm Gun according to demarre equation using Type 1 47mm APHE as reference
101mm @ 0m - 800m/s
80mm @ 500m - 679m/s
63mm @ 1000m - 576m/s
50mm @ 1500m - 488m/s
39mm @ 2000m - 414m/s
Ballistic Coefficient used was 4700, standard for 57mm AP rounds.
My calculated figures represent the real life performance better as long as the quality of that 57mm Type 1 APHE shell is equal to the quality of the 47mm Type 1 APHE shell.
80mm @ 500m is better than 64mm @ 500m by a good margin but by a realistic margin
