primary source AMX-32, incorect Gear (and reverse speed)

CaID · October 18, 2021

# Game version

# Description

The AMX-32 as modelled ingame is having the wrong reverse speed, the AMX-32 have a Minerva ENC 200 transmission just like the AMX-30B2 which is inverting and should give the same speed forward and backward.

# Steps to reproduce the issue

Lunch a game using the AMX-32
drive backward until you reach the maximal speed.

# Additional Information

The AMX-32 was built with the New Minerva ENC 200 transmission. revealed in 1979 along side the AMX-30B2 during satory 1979, the AMX-32 already had this new gearbox when the tank was marketed in his earlier form using the 105mm. there was 6 AMX-32 built in 3 different model but all of them was having the same transmission. source indicated clearly in multiple place "Minerva transmission" or "inverting transmission" or "ENC 200" or "5 gear forward and 5 gear backward" those indication are all associated to the Minerva ENC 200 who is a 5-speed inverting transmission.

this have for effect to give the AMX-32 identical power to go backward as it can go forward. the speed is them the same in both direction. the ENC 200 have a torque converter ratio of:

1st gear : 4 04:1

2nd gear : 2 33:1

3rd gear : 1 49:1

4th gear : 0 93:1

5th gear : 0 62:2

those gear are all forward, there is no reverse gear as the transmission include an inverse system making those gear been both for forward and reverse.

On the AMX-32, this transmissions give this speed who was been confirmed by Giat who was the builder of the AMX-32

1st gear : 10 km/h

2nd gear : 17 km/h

3rd gear : 26 km/h

4th gear : 42 km/h

5th gear : 65 km/h

this would give the same speed backward as the transmission is inverting. the backward speed would reach 65 km/h

now did some digging and found the coding who rule the speed in the data of Warthunder. it give this

"gearRatios":

[ { "ratio": -2.4 }

,

{ "ratio": -4.61 }

,

{ "ratio": 0.0 }

,

{ "ratio": 8.0 }

,

{ "ratio": 6.0 }

,

{ "ratio": 4.64 }

,

{ "ratio": 2.6 }

,

{ "ratio": 1.667 }

,

{ "ratio": 1.2 }

,

{ "ratio": 1.0 }

for those who do not understand the coding, those are the lines of code that rule the gear of the AMX-32. this give 7 forward speed and 2 backward speed. thing that i later comfirmed ingame and will be show in the screenshot bellow. this make the reverse speed performe somewhere between the 4th and 5th gear, giving a speed around 27-28 km/h in reverse. which is far from the reality

while the AMX-32 should infact have 5 forward and 5 backward speed, the 5F/5R would also be incorrect.

the AMX-32 is equiped with a Torque converter who allow the Gear to work in a Low and High setting (like a off-road vehicles) which actually double the ratio. as this feature is rather complicated to have ingame, the best way to simulate it would be to double the gear, as each gear have a High and Low version, simply making 10 gear instant of 5 would make it perform just like if there was 5 gear + torque converter in real life. making it simple for the programmer to implement this feature. this would make the AMX-32 drive a lot smoother.

after making my own calculation, and made it verified with some of my fallow friends who have notion of the game and programme, i concluded this would be the correct gear

"gearRatios":

[

{ "ratio": -0.62 }

,

{ "ratio": -0.93 }

,

{ "ratio": -1.49 }

,

{ "ratio": -1.55 }

,

{ "ratio": -2.325 }

,

{ "ratio": -2.33 }

,

{ "ratio": -3.725 }

,

{ "ratio": -4.04 }

,

{ "ratio": -5.825 }

,

{ "ratio": -10.0 }

,

{ "ratio": 0.0 }

,

{ "ratio": 10.0 }

,

{ "ratio": 5.825 }

,

{ "ratio": 4.04 }

,

{ "ratio": 3.725 }

,

{ "ratio": 2.33 }

,

{ "ratio": 2.325 }

,

{ "ratio": 1.55 }

,

{ "ratio": 1.49 }

,

{ "ratio": 0.93 }

,

{ "ratio": 0.62 }

this new gear ration would give the AMX-32 a 10F/10R who would simulate a 5-speed transmission with a Torque converter. in theory this would give the same speed as reported by Giat for the AMX-32. the developper could copy-paste this line of code and as far i know, it should fix the bug.

# Affected vehicles

AMX-32

# Files

here is screenshot of the testdrive done with the AMX-32 stock, doing a straith drive in the paved road who is almost perfectly horizontal and flat. it clearly show the gear and the speed (i suppose the speed would be better if the tank wasn't stock)

Spoiler

# Sources

Source 1
1. Giat information Brochure from June 1979 (Giat is the builder so this brochure should be primary source) concerning text is highlighted in red next to the letuce, a traduction will fallow
2. Spoiler
  
  translation of the highlight part
  
  The New transmission MINERVA include hydroelectric torque converter, 5-speed forward gearbox (the first been for exceptional use) and inverter, a system of pure Hydro-static direction
Source 2
1. SATORY X (1985) book, concerned part highlighted in red with a translation fallowing
2. serial SATORY book talk about the AMX-32 but this one is the most recent i could find and i believe was the last who presented the AMX-32 as been marketed. this would include change if the later model of AMX-32 would had received change on that matter.
3. Spoiler
  
  translation of the part highlighted in red
  
  Semi-automatice Gearbox, 5 forward speed , Power-shift inverser, torque converter , hydrostatic direction
Source 3
1. Revue internationale de defense, december 1981, concerned part highlighted in red with a translation fallowing
2. Spoiler
  
  translation of the part highlighted in red
  
  We have 5 forward speed and 5 backward , the first, in both case, only serve in case of emergency
  
  this one do not properly indicate neither the transmission or the inverser, but indicate the specificity of a 5-speed transmission with inverser
Source 4
1. Armada International, Mai 1981, concerned part highlighted in red with a translation fallowing
2. Spoiler
  
  translation of the part highlighted in red
  
  The transmission is equip with a torque converter . the steering is Hydro-static pur, the driving is done using a steering wheel without steering break. the 5-speed gearbox with inverser is with hydroelectricity command.

Source 5
1. details of the ENC 200, since the tanks are equipped with inverser, the reverse speed are not used.
2. https://www.armyrecognition.com/images/stories/customer/sesm/pdf/ENC_200.pdf
Source 6
1. details of the ENC 200, Jane's AFV Retrofit Systems 1991-1992, this one seem to ignore the reverse gear as the tanks had inverser.
2. Spoiler