Yet they also provide images of the the gun in some field test configuration as well as a technical drawing of the gun inside the tank.
It’s clear that the 70mm Type 92 Battalion gun is way too small and the lenght shown would fit much more closely to the 7-cm (75mm) Type 41 and Type 94 mountain guns.
70mm Type 92 Battalion gun
75mm Type 41 Infantry/Mountain gun
Ro-Go's Type 94 gun on a field test mount
Ro-Go's Type 94 cannon in turret mount drawing
Edit: The Ro-Go in the game already fires shells at higher velocity than the 70mm Type 92 Battalion gun, thus it won’t really make any difference.
Perhabs the gun was indeed a purpose built 70mm cannon firing the same type of shells as the Type 92.
Well, the thing is that, I don’t have concrete proof that the gun is wrong or that it should use different ammunition.
All I can argue is that the gun is much larger than the Type 92 Battalion gun, which fires the 70mm ammunition the Ro-Go currently uses.
Maybe if I had some more detailed information about the 75mm cannons that would make it possible to link them to the Ro-Go’s gun, it could be possible.
Yeah but how does that help to make a point about the gun having potentially wrong stats?
There’s plenty of information about the ammunition, the issue is proofing that the Ro-Gos gun is actually a 75mm cannon and not a 70mm based on the Type 92 Battalion gun.
I recall a chart showing which guns particular ammo was used in - IIRC there was a discussion about APHE use in AA guns…sometimes such references can be evidence of different guns performance - ie ratehr than searching for information on the gun itself see if there’s info on the ammo types and sizes - eg a longer cartridge will be evidence for different performance.
Since it hasn’t been discovered, it’s likely that they mistook the caliber for 70mm since Japanese documetns often simply call them 7cm caliber guns, even when they are 75mm.
Since 70mm is exclusively used by the Type 92 Battalion gun, they probably also thought it would use that ammunition.
There’s a couple of works referenced on the wiki page that may give more info, but apparently they say it was derived from the Type 92.
So I’d be wary of positively supporting 1 theory (ie that it was really the Type 94 Mountain gun) over the equally plausible alternative (that it really was derived from the Type 92) just because muzzle velocities are similar - they didn’t find the gun so how would they know that??
Well, from Japanese documents obviously. It’s literally written in that US report.
Well, and where would they get that information? Probably from the same US document that called it 70mm Type 94 cannon, saying it uses the same 70mm ammunition as the Type 92.
Yet the muzzle velocity stated doesn’t match with the performance of the Type 92.
Of course another possibility exists:
That the Type 94 was derived from the 70mm Type 92, basically the same gun with longer barrel, and fired the same shells while having larger casings for more propellant.
Since the project ended well before WW2, there’s no evidence left about such ammunition.
I also just noticed that the Ro-Go’s 70mm cannon in the game is already using the higher muzzle velocity stated by the document.
Only the HEAT round has the same low muzzle velocity as the other shells fired form the 70mm Type 92 Battalion gun.
Thus it doesn’t make really any difference.
I thought that the tank in-game fired shells at lower velocity than it should, but it actually doesn’t.
