[2.13.0.59] HEI in MK103's air target belt has wrong muzzle velocity

[Ho229V3 79]

# I have:

• Restarted the game: yes

• Cleared the cache: yes

• Checked game integrity: yes

• Disabled custom content: yes

# Game version

My game version: (2.13.0.27)

# Platform

PC

# Description

 

Take ta152c as an example, it is equipped with mk103 cannon. In the protection analysis, it can be seen that different shell have different initial muzzle velocitys. In the figure below, it can be seen that hei and Heit have very different initial speeds. The muzzle velocity of HEIT is 860 M / s, while that of HEI is only 525 M / s.

 

 

It is worth mentioning that this bug should have existed for many years, probably from the beginning of the game. At that time, there was no protection analysis function in the game, so the data of different ammunition can only be obtained by datamine. However, bug feedback does not welcome datamin, so this may be the reason why no one gives feedback on this bug. The recent emergence of the protection analysis function allows us to speak openly about the existence of this bug.

 

The second figure shows the ammunition data of mk108 of me262. It can be seen that the initial speed of Hei ammunition of mk108 is exactly the same as that of Hei ammunition of mk103, that is to say. The HEI of mk103 is copied from the HEI of mk108.

 

 

Even without relying on historical documents, common sense will tell us that the HEI of mk103 cannot have the same slow muzzle velocity as the HEI of mk108.

 

In the third figure below, it can be seen that the size of mk108 and mk103 are completely different. (figure from https://quarryhs.co.uk/30mm cannon.htm) 

Mk108 is 30x90rb and mk103 is 30x184rb. Moreover, in this figure, no matter what kind of mk103 ammunition, there is no ammunition with an muzzle velocity less than 700 m/s.

Although this link is strictly not a special manual (because my acces is limited, I can't find a special mk103 manual), it can still explain this problem: it's not advisable to simply copy the HEI data of mk108 into the ammunition of mk103. A more reasonable solution is to change the muzzle velocity of HEI of mk103 to the same as that of HEIT of mk103, i.e. 860m / s, just as the muzzle velocity of Hei and Heit of mk108 in the second figure is the same.

 

 

 

 

# Steps to reproduce the issue

1. start the game and open the protection analysis of any plane with MK103

2.  u will see the difference of HEI and HEIT

# Additional Information

Videos, links etc. Please do not use streamable.com. 

# Affected vehicles

all MK103 planes

# Files

You must attach these files:

• Screenshots taken using the in-game functionality [Windows, Linux, Mac] see pictures above

• Replay or link to server replay (.wrpl or URL) with timestamp [All platforms] #2021.12.20 18.20.17.wrpl

• Client log (.clog) [Windows, Linux, Mac]2021_12_20_17_54_33__19980.clog

• DirectX diagnostic file (dxdiag) [Windows]DxDiag.txt

 

 

 

Edited December 20, 2021 by Ho229V3

[Stuhlfleisch 3,762]

Hello, thank you for your interest in improving the game! Your report has been forwarded!

 

Also, next time you create a report like this, which is not about a historical issue, you should instead create it here: https://forum.warthunder.com/index.php?/forum/1975-aircraft/

 

Cheers!