Yoshi_E

The illustration shows RHAe - not RHA values. RHA being just a block of steel - while RHAe is often a simulated target of special armor.
Modern rounds are specifically designed to deal better with special armor - something that you cant just calculate.
As @FORMATOSE pointed out, I dont know if those are the official KMW/RH figures - or their own speculation.
 

Thanks to more recent pics we know the penetrator is a bit longer than we initially assumed:



 
 
Here is a better example that talks specifically about a steel target:


 
650mm@0° at 3km
750mm@60° at 3km
 
On an old Bundeswehr slide from 2004 or so they lists DM53 as
 
 
 
 
If you now also take into account that DM53/63 can bypass ERA such as K5 (~250mm RHAe) by non-initiation - you will arrive at the requirement of LKE II to perforate 1000mm RHAe

 

Im not yet fully convinced that the lines are just simple weld lines. Thats why I initially brought this up.
In the center the blocks are directly welded with a smooth finish.

On the outside they are cut into the steel and then filled - non of the lines have any visible typical weld patterns (though could be covered by thick layer of paint). Butt joints like these also usually bulge out of the plate - instead being embedded. Why is the pattern irregular (but also identical on all tanks)?

If they are strongly welded together, why would there be two additional bolts to strap all the four blocks together?
That's why I wondered if these might be crumple zones to allow for some minimal shift of the blocks to feed more material against a penetrator. I wonder if that could work for thicker blocks like these, maybe someone could simulate it.

Anyway lets leave it at this, discussing it further would be unnecessary.

The blocks are around 360-370mm thick based on my current estimate. Each section including the joint lines is 100mm, with the last block being a bit thinner, around ~60-70mm.

Gunner side is 542kg - Loaders side is 389kg (@ TWMSR)

 
 What makes you think that the gunshield is some aluminum alloy? Its definitely some sort of tempered metal.

Here a short animation displaying the parts

The model is based on a mix of 3D photogrammetry scans of the entire turret and schematics, but still needs some fine tuning.
 

Im not yet fully convinced that the lines are just simple weld lines. Thats why I initially brought this up.
In the center the blocks are directly welded with a smooth finish.

On the outside they are cut into the steel and then filled - non of the lines have any visible typical weld patterns (though could be covered by thick layer of paint). Butt joints like these also usually bulge out of the plate - instead being embedded. Why is the pattern irregular (but also identical on all tanks)?

If they are strongly welded together, why would there be two additional bolts to strap all the four blocks together?
That's why I wondered if these might be crumple zones to allow for some minimal shift of the blocks to feed more material against a penetrator. I wonder if that could work for thicker blocks like these, maybe someone could simulate it.

Anyway lets leave it at this, discussing it further would be unnecessary.

The blocks are around 360-370mm thick based on my current estimate. Each section including the joint lines is 100mm, with the last block being a bit thinner, around ~60-70mm.

Gunner side is 542kg - Loaders side is 389kg (@ TWMSR)

 
 What makes you think that the gunshield is some aluminum alloy? Its definitely some sort of tempered metal.

Here a short animation displaying the parts

The model is based on a mix of 3D photogrammetry scans of the entire turret and schematics, but still needs some fine tuning.
 

For the right one I currently got 0.0707m^3 * 7750kg/m^3 ~= 548kg but the model is not fully tweaked yet.
Im assuming thats without the bolts and the part attached on the back?
Thanks for the info.
 
 
 
Do you, or anyone else, have an idea why there is a 2nd hole below the MG that goes all the way through, even through the armor plate of the mantlet?

 
On the Inside it looks like this:

I assumed it would be just the mount for the MG and or a reservoir for the recuperators/intensifiers of the recoil system, but that doesn't seem to be the case?
Why does it go all the way through, not only the cradle, also through the mantlet armor plate, but not the Mantlet main armor blocks.
 
Or is it just and access for maintenance hatch will be closed before the gun mantlet armor is installed?
Just like the MG Its not present in any form on the new 130mm.
 
 
Edit: Seems to be a manual smoke extractor as far as i could find. 

Why all this guessing?
https://drive.google.com/file/d/0B4xitrrBUDsYckRhSXNNSXpKbkE/view?pli=1
Gun cradle weight of 595kg, and all the other stuff you can probably use translate for (this is most likely for Strv 122 as well, not Strv 121).
So gun cradle on 122 is steel, not titanium, weight in this location doesn't matter as much as it's right on the pivot point, inertia and balance doesn't change a whole lot because of it.
 

I spend recently a bit of time with the Rh-120mm L44 gun.
Here are my findings (weight estimation):
 
 
Here are also some great pics of the L44 cut open:
 
 

I spend recently a bit of time with the Rh-120mm L44 gun.
Here are my findings (weight estimation):
 
 
Here are also some great pics of the L44 cut open:
 
 

I spend recently a bit of time with the Rh-120mm L44 gun.
Here are my findings (weight estimation):
 
 
Here are also some great pics of the L44 cut open: