Laviduce

Hi Xoon,
 
I do not have all the information you requested but this might be of interest. According to Krapke:  For the Leopard 2(A0-A4) the gun laying system or Waffennachführanlage (WNA) is known as H22.  It is a electric-hydraulic retarder control eqipped hydrostatic motor where an electric motor powers a coaxial piston pump which pumps the hydraulic fluid out of the reservoir into hydro storage cell.
 
Here is the diagram of the WNA H22:
 
 

Hi Xoon,
 
I do not have all the information you requested but this might be of interest. According to Krapke:  For the Leopard 2(A0-A4) the gun laying system or Waffennachführanlage (WNA) is known as H22.  It is a electric-hydraulic retarder control eqipped hydrostatic motor where an electric motor powers a coaxial piston pump which pumps the hydraulic fluid out of the reservoir into hydro storage cell.
 
Here is the diagram of the WNA H22:
 
 

The IS-7's ergonomics got rave reviews from the testers, especially with the good autoloader. Anyway, here's the cross section of the 1946 and 1948 model:


 

Comparison of the IS-7's (Object 257) side armor with other soviet tanks:

Hello everyone!  i would need some feedback on my latest estimates on the Leopard 2(A0-A4 early):
 
 
 

My proposed protection solution could potentially satisfy the plot depicted in the Lindström presentation:

 
As we know, the center plot is of particular interest. It seems to depict the various armor solutions (packages). I used the magenta colored plot line (B-type armor tech?) for my solution:

 
 
 

original source: 
https://drive.google.com/drive/mobile/folders/0B8KVYt57g6q_MUk1V09wbjlsUkE/0B8KVYt57g6q_U3NBV19QVl9uWGs/18GUvRqmI8t2JmYVxpE90U5yzsCgPuDEL/0B8KVYt57g6q_aXpmNUJ2cHdDNjA/0B8KVYt57g6q_QTVHN1EyMThwRnM?sort=13&direction=a

Thank you very much for this information. The turret modules seem to be asymmetrical, making one potentially heavier than the other. Anyway, from where did you get this ?

translated by user North_Eleanor
 
turret special armor weight - 1381kg (690kg on each module)
hull special armor weight - 1249kg

you can try to find some armor near the GPS and gunner prism 

Updated volume model:
 

Leopard 2(A0/A1) Study Update:
 

Type 90 Study Update: 
 

Talk about Type90, i got some information from Chinese document which mention about the armor composite used on Type88 which is the prototype for Type90 recently. Not sure the exact truth but i would like to share.

“Japanese Type88 tank's turret and hull composite armor were trying to use different ceramic material (Alumina、Silicon oxide or Silicon carbide ceramic cut in rectangle or hexagon),each layer using binder to bonded together. The protection of this armor can reach up equal to 400mm thick of armour steel (BK) and is capable of defeat 120mm high density KE projectile (muzzle velocity>1600m/s) fired from 200meters at 0 degree, and also capable to protect against the 120mm HEAT shell which capable of penetrating 600mm of armor.  Besides, there are many of different type of armor plate, the use of ceramic material and it's ability of protection giving the armor research development a new direction”
 

image10  Type88 tank's spaced (composite) armor structure.
陶瓷板=Ceramic plate    毫米=mm
 
Other than this，japan seems are developing some kind of Kevlar composite

It says:"Japan is currently develop a Kevlar fiber with Titanium alloy or aluminum structured multi-layer composite armor "
 
Of course those are just for the prototype of type90, but we can try guessing the armor from this 
 
source:
<<间隔（复合）装甲——现代坦克的主要装甲结构>>(1982)      (Composite armor--the main structure of the armor for modern MBT) (1982)
<<国外复合装甲中非金属材料的应用和研究概况>>(1983)      （Summarize of the use and research of non-metallic material in foreign composite armor）（1983）
 
ft. Akula_941

Guys, it's not over yet. 

And yes, I do have the original file, but for some obvious reasons I add some watermarks. 
 
Waffentrager is doing the same thing as he did on Warthunder forum. 
He is just bluffing with unknown source screenshots or photoshopped fake “documents”.
He deleted every post arguing the pictures' authenticity to make himself “invulnurable”. 

Could it be possible to have a more mature debate, please ?

everyone can make a mistake )

Well - I did jump to conclusions without doing the proper looking into before sharing what's found online just because at first glance it matches with other material. So albeit harsh words, I did sort of earn the needed-backlash. 

So basically Damian is having a meltdown.
 
What a shock.

It's less about 'why not' than it is about 'why'. Why would the IDF just publish documents it has on the Merkava 1? 
And unless none asked the IDF to publish it, it would probably still be classified simply because the expiration date hasn't passed. Though it's probably not hard for some fanboy to go to the Czech Republic with some special gear and measure the armor all around.

This diagram above is not totally consistent with what i have here:
 


 
-The block in front of the lower part of the EMES 15 does not seem to be not much thicker than 320 - 350 mm. The plate where the EMES piece penetrates does not seem to be much thicker than 300 mm.
 
-The special armor turret sides seem to be around 310 mm thick. 
 
-The thickest part of the of the turret seems to be the left turret face with 820-840 mm.
 
- The front turret roof seems to be about 45 mm thick.
 
- The turret roof seems to be about 30 mm thick.
 
- The front hull roof over the driver seems to be about 30-35 mm thick.
 
-The front hull /glacis seems to have a varying LOS thickness of 570 - 675 mm.
 
- The left turret face and right turret face seem to have different special armor thicknesses. 650 mm vs 830 mm on average.
 
The heavy side skirts seem to be around 105 -110 mm thick.
 
 

YPG Jihad design bureau

I  am getting the impression that they are talking about the tanks pictured above (Stillbrew Chieftain Mk10, Challenger 1, Leopard 2A4 (early), M1A1, Vickers Mk7/2) The picture seems to have been taken some time in 1990.
 
According to the Challenger 2 book by Osprey the Leopard 2A4 and the other contestants were "current production models". As we know; the latest models of these tanks were the Chieftain Mk11, Challenger 1 Mk3 (minus ROMOR armor), Leopard 2A4 with 2nd gen. special armor, M1A1 HA, Vickers Mk 7/2.
 
There is at least 1 problem with this statement.  The Leopard 2A4 pictured above seems to be one of the Leopard 2A4s that still features the 1st generation special armor. If take a closer look at the heavy side skirt mountings we see that they seem to correspond to the earlier models not the latter vehicles (vehicle 97+ batch 6, batch 7 and batch 8) as seen below.
 
Batch 8 Leopard 2A4:

 
It seems that this protection feature above the heavy side skirts was dropped in post 1992 Leopard 2A4s.
 
 
 
 
 

Although the Duke boys' new machine wasn't quite as fast as the General Lee, Rosco was nonetheless presented with an entirely new set of problems.
 

This confuses me even more. Rolf Hilmes explicitly states that the combined mass of the hull and turret chassis including special armor inserts accounts for 48 % of the entire weight of the 55t Leopard 2. This comes to about 26,5 t
 
In the Spielberger book the combined weight of the basic hull and turret (Panzerwanne and Trumgehäuse) are given at 21 t. Would Hilmes be off by 5,5 t (20+ %) ?