Rptd: Transmission Issue of Char Leclerc S1

[CXK114514 147]

 

In last&current devserver,Char Leclerc S1 has some problem on both gear numbers& ratios ，it affects the performance of the tank in mobility.According to a Chinese paper were discussing about design of transmissions, the ESM500,which is the transmission of Char Leclerc S1,should has 5 forward gears&2 gears for backward rather than 8 forward&4 backward in the devserver.The gear ratios of each gears are as follows:

Translate to English:

gear numbers         transmission gear ratios       overall gear ratios

I                                      7.59                                9.03

II                                     4.49                                5.36

III                                    2.85                                3.40

IV                                    1.58                               1.88

V                                     1                                    1.19

-I(- means reverse gear)-5.38                              -6.42

-II                                   -1.89                              -2.26（ in the table the overall gear ratio is 2.6 ，it‘s a typo）

 

 

 

Another PDF which is from the manufacturer of the transmission says that it also has torque converter with stall torque ratio of 2.3.In this situation we should use the technique that each gear ratios from about should have 2.3 multiplier to create 5 extra foward gears& 2 extra reverse gears to simulate the condition when converter was opening.Therefore，the total numbers of gears in the game should be 10 forward gears & 4 reverse gears .

 

Then we can calculate the top speed of each gear through the gear ratio by using following equation：

 

maximum speed of forward*（the gear ratio /gear ratio of top gear）

 

Here's the result I've figured out.

 

I 20.769(9.03*2.3)  4.06km/h

II 12.328(5.36*2.3)  6.85km/h

III 9.03 9.36km/h

IV 7.82(3.40*2.3) 10.80km/h

V 5.36 15.78/km/h

VI 4.324(1.88*2.3) 19.56km/h

VII 3.40 24.85km/h

VIII 2.737(1.19*2.3) 30.86km/h

IX 1.88 44.94km/h

X 1.19 71.0km/h

-I -14.766(-6.42*2.3) -5.72km/h

-II -6.42 -13.16km/h

-III -5.198(-2.26*2.3)-16.25km/h

-IV -2.26 -37.38km/h

 

 

when we using it‘s maximum forward speed & the gear ratio to calculate the top speed of backward ，we can figure it out that the reverse top speed should around -38km/h，not the -18.6/km/h in the devserver. other gears also have different top speeds compare to the devserver besides the top gear of forward.

 

Solution：Fix the transmission by using above data&technique.it is the proper way to improve the mobility of Leclerc，and the performance will more realistic.

 

 

Sources:

《Discussion of Problems in Planetary Transmission》 ,Chen Qi-jiong(China North Vehicle Research Iustitute Beijing 100072) ,Vehicle & Power Technology 1996/03

 

 

Website of it originally from(it's required to have a registered account to check online/donwload the paper,so I downloaded and post the paper above the link.)：

http://www.en.cnki.com.cn/Article_en/CJFDTotal-BGTK199603005.htm

 行星传动中问题的探讨_陈其炯.pdf

 

 

Title&abstract in English

 

 

Information of the Academic Journal 

兵工学报：坦克装甲车与发动机分册 Vehicle & Power Technology 1996/03

FQ: 季刊 Quarterly

AD of Publication: 北京市 Beijing

Lanuage: 中文;Chinese

ISSN: 1009-4687

CN: 11-4493/TH

YP: 1979

 

 

PDF from the transmission manufacturer :

https://www.armyrecognition.com/images/stories/customer/sesm/pdf/ESM_500.pdf

 

Edited May 29, 2019 by KPzLeopard2

[KnightoftheAbyss 3,387]

Hi,

    Where is the evidence that the Leclerc has this transmission fitted?  The Dev Server Leclerc does not identify a particular transmission.  Please also pay attention to the referencing standards.

 

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[CXK114514 147]

The automatic gearbox ESM500, installed in the French main battle tank Leclerc can be coupled to a maximum 1600hp engine.

http://www.renk-france.fr/esm500-–-high-end-power-pack-for-50-tons-class-vehicles

Transmission :Boîte automatique SESM ESM 500 à 5 rapports avant et 2 rapports arrière

http://www.chars-francais.net/2015/index.php/10-archives/de-1990-nos-jours/7-char-leclerc-1991

similar description also in the PDF from the transmission manufacturer I had shown before.

https://www.armyrecognition.com/images/stories/customer/sesm/pdf/ESM_500.pdf

Edited May 28, 2019 by KPzLeopard2

[KnightoftheAbyss 3,387]

Thanks for that.

 

This site that you cite actually states that there were a possible two types of transmission that can be fitted.

http://www.chars-francais.net/2015/index.php/10-archives/de-1990-nos-jours/7-char-leclerc-1991

Quote

Groupe moto propulseur : Diesel Hyperbar Wärtsilä SACM V8X ou Turbo diesel MTU 883 V12
Transmission :Boîte automatique SESM ESM 500 à 5 rapports avant et 2 rapports arrière, ou Boîte automatique RENK HSWL 295 TM à 5 rapports avant et 3 rapports arrière
Vitesse maximale : Sur route : 72 km/h - Tout-terrain : > 55 km/h - En marche arrière : 38 km/h

 

Powertrain: Diesel Hyperbar Wärtsilä SACM V8X or Turbo diesel MTU 883 V12

Transmission: SESM ESM 500 automatic transmission with 5 front and 2 reverse gears, or RENK HSWL 295 TM automatic transmission with 5 front and 3 rear gears
Maximum speed: On the road: 72 km / h - Off-road:> 55 km / h - In reverse: 38 km / h

 

I will discuss this with the Gaijin Historian and the Developer.  I also suspect that this is part of a known issue with transmissions.

 

Thanks

[CXK114514 147]

8 hours ago, KnightoftheAbyss said:

Thanks for that.

 

This site that you cite actually states that there were a possible two types of transmission that can be fitted.

http://www.chars-francais.net/2015/index.php/10-archives/de-1990-nos-jours/7-char-leclerc-1991

 

I will discuss this with the Gaijin Historian and the Developer.  I also suspect that this is part of a known issue with transmissions.

 

Thanks

Hello

 

Hswl 295 tm+Mb 883 ka500 is only for Leclerc U.A.E，which is an export version of Leclerc.

https://www.renk-ag.com/fileadmin/Produkte_und_Service/Produkte/Dokumente/RENK_transmissions_for_military_tracked_vehicles_en.pdf

Its first production application is in the Giat Industries' Leclerc MBTs and armoured recovery vehicles ordered by the United Arab Emirates in early 1993. In this application it is coupled to an MTU 883 12-cylinder diesel engine developing 1,100 kW (1,340 hp).

http://www.army-guide.com/eng/product580.html

 

Edited May 29, 2019 by KPzLeopard2

[KnightoftheAbyss 3,387]

Thanks

[KnightoftheAbyss 3,387]

Hi
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