[2.13.0.70] Ka-Chu gun depression and elevation.

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This issue affected Type 3 Ka-Chi.

 

Gun elevation:

In the game the Ka-Chi has +24 degree of gun elevation, this is rather strange number consider majority of Japanese tanks have 20 degree of elevation by standard.

And to prove that this should not be the case we can see that the gun can elevating too much that the model is clipping through the mantlet and turret ring.

Spoiler

 

Gun depression:

The gun depression of Ka-Chi according to its stats is -10 degree while it seems reasonable but still majority of Japanese light and medium tanks from this period have -15 degree.

And if you take a look in the Xray you can see there is still a good amount of room left for the gun to depress.

Spoiler

 

So apparently the vertical guidance of the Ka-Chi is exact copy of the Ka-Mi which is rather questionable considering how the Ka-Chi turret is modified of Chi-He's turret.

Spoiler

 

The Chi-He has -15 depression and +20 elevation. If this stats is applied to the Ka-Chi then this will prevent the gun clipping through the mantlet or turret ring.

For the gun depression as you can see the Chi-He 47 mm gun is almost touching the turret cieling to achieve the depression as much as possible which the Ka-Chi is not doing.

Spoiler

 

According to the Japanese wiki on the Type 3 Ka-Chi:

Spoiler

特三式内火艇の主砲である一式四十七粍戦車砲は、砲身長が48口径の2250 mmであり、俯仰角度は-15度から+20度だった。

''The main gun of the Type 3 Ka-Chi, a set of 47 粍 tank guns, had a height of 48 calibers, 2250 mm, and an elevation angle of -15 to +20 degrees.''

https://ja.wikipedia.org/wiki/特三式内火艇 References they used is in the bottom of the page. 

 

Yes, i'm aware that wiki is not acceptable as a main source but it is still a hint that there should be a further research for the developers  to find out the Type 3 true vertical guidance.

My simpliest solution is by copying the gun stats of Chi-He and not the Ka-Mi, because both Ka-Chi and Chi-He beside of having almost the same turret but they also using the same Type 1 47 mm gun.

2021_08_16_19_44_53__11516.clog DxDiag.txt

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According to a book detailing the 47 mm Type 1 tank gun:

"The first battle of the Type 97 medium tank equipped with this tank gun was the Battle of the Philippines at the beginning of the Pacific War, and was used in all fronts until the end of the war. In addition, the Type 1 medium tank (Chi-He), an improved version of the tank, and the Special Type 3 motorboat (Ka-Chi) manufactured for the Navy were also equipped with this tank gun. The elevation angle of this tank gun was -15 to +20 degrees."

 

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本砲を装備した九七式中戦車の初陣は太平洋戦争初頭の比島攻略戦で、以降終戦まで全戦域で使用された。また改良型である一式中戦車（チヘ）、海軍用に製造した特三式内火艇（カチ）も本砲を装備した。

The first battle of the Type 97 medium tank equipped with this tank gun was the Battle of the Philippines at the beginning of the Pacific War, and was used in all fronts until the end of the war. In addition, the Type 1 medium tank (Chi-He), an improved version of the tank, and the Special Type 3 motorboat (Ka-Chi) manufactured for the Navy were also equipped with this tank gun.

 

Experimental 47 mm Type 1 tank gun to be tested.

 

Specifications

 

Elevation: -15 to +20 degrees.

高低射界：－１５～＋２０度

 

Source

"Japanese Army artillery, Infantry gun, Anti-tank gun" Written by Jiro Sayama. July 2011. ISBN-13:‎ 978-4769826972. pp. 347-359.

 

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Edited August 22, 2021 by I_NAMELESS_I

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