I’ve recently come across these graphs when just doing random research.
I decided to compare the graphs to the in game performance and this is what I’ve found.
By using the WarThunder wiki calculator we can check the velocity that a projectile needs to travel at to achieve a specific penetration. Using the in game flat penetration of the 17 pounder AP rounds we can effectively know what velocity they have at a specific distance. At 1 km, all the 17 pounder AP rounds have around 763 m/s (approx. 2500 ft/s) of velocity, meaning these rounds all have identical ballistics.
Shot Mk.8 APCBC has 155 mm of flat pen at 1 km.
Shot Mk.6 AP and Shot Mk.4 APC both have 139 mm of flat pen at 1 km.
This is weird in of itself as these rounds have completely different set ups, including the obviously un-aerodynamic APC round. And looking at the graphs we can clearly see the graphs state that the APCBC round has better velocity at distance than the other two rounds which share the same ballistics.
In fact, comparing the graphs to the in game projectile performance states the following:
- Shot Mk.8 APCBC is underperforming.
- Shot Mk.6 AP and Shot Mk.4 APC overperform.
At 1100 yards (1005 meters) the graph for both AP and APC shot states that the rounds have a velocity slightly higher than 2300 ft/s (I’ll say 2310 ft/s or 704 m/s). Meanwhile the graph for APCBC shot places the velocity higher than 2500 ft/s, slightly higher than the 2575 ft/s (785 m/s) given for the APCBC fired from the 77 mm gun, but close enough to where I can’t really say another value, so 2575 ft/s it is. This would mean that at 1 km the AP and APC shots should achieve 124 mm of flat pen (compared to the current 139 mm), while APCBC shot would achieve 161 mm (compared to the current 155 mm) using the calculator provided by the wiki.
Shot Mk.8 APCBC
Shot Mk.6 AP and Shot Mk.4 APC
This is where I need help. To make a bug report on this I would need to know the documents from which those graphs come from, as a cover of the document is necessary for bug reporting. I’ve tried but could not find these documents, only the specific graphs. Any help would be appreciated. Keep in mind this would also apply to the 77 mm gun, for obvious reasons.
An additional thing is that with these newer ballistics Gaijin could remove the 0.9x modifier from Shot Mk.4 APC (it currently has this modifier as if it were an uncapped AP round because otherwise it would perform identically to Shot Mk.8). It would achieve the same 190 mm of flat pen at point blank as Shot Mk.8, but with higher drag would lose it’s velocity faster over distance, meaning that at 1 km it would achieve 138 mm of pen.
