The reactive armor that the T-90M uses is more advanced then the ERA the west issues to our tanks (Russians use Relikt now I think). It's supposedly good enough to disturb the M829A3 and DM66 KE penetrator enough for the T-90M's main armor to stop it out right at 2 km.
The APFSDS is known as 120 mm DM63 (i.e. DM = German ammo, 3 = AP round, 6 = sixth round of the type (AP) for this caliber).
I think we should not underestimate the capabilities of the new Relikt ERA, but also not the ones of 120 mm NATO APFSDS. Currently a number of countries have already their second generation APFSDS after Kontakt-5 - the first German APFSDS after Kontakt-5 was tested is the German 120 mm DM43, which has been descirbed to have "good" capabilites against modern ERA by Rheinmetall. The current German ammo is 120 mm DM53A1/63, which is specifically optimized against ERA and multi-layer armour. The same goes for the French and the U.S., both fielded another round after their direct counter for Kontakt-5 (the U.S. developed M829A3, but M829A2 was the direct anti-Kontakt-5 round, the French also have 120 mm OF 1 (DM43) but also a DU version with different penetrator diameter).
DM63 and M829A3 are, although they claim similar performance, very different rounds. M829A3 is very slow, but thick and long. DM63 is slightly shorter, but significantly faster and thinner.
T-90MS has frontal protection 850мм against armor-piercer, 1200 mm against cumulative shell.
Where does this value come from? Nii Stali or from some fanboy?
Can you point us to a link that confirms this 125mm APFSDS capability just curious thats all?
It is a very logical and reasonable assumption. The lastest 125 mm APFSDS can penetrate up to 650 mm RHA at 2,000 m and the hull armour of nearly every MBT including the Leopard 2A5/6 and M1A1/A2 is about 600 +/- 50 mm thick. Given the fact that most matierals are per weight more efficient than steel but not per thickness it seems to be very improbable that the armour has a protection level greater than 600 mm RHAe against kinetic energy.
Composite armour is designed to offer better protection at the same weight than steel armour, but not at the same thickness. Some people estimate protection level by calculating the weight/thickness ratio (i.e. the density) of the armour, then taking a look at the public available informations about the development of composite armour in the country (e.g. books, declassified documents, patents) and then basing their values for protection levels on this informations.
For the early models of M1 Abrams and Leopard 2 the weight/thickness ratio seems to be somewhere around 0.4 to 0.6 (i.e. that the thickness of a steel plate with the same weight is only 40 - 60% of the armour thickness).
Some rather uneducated people believe that DU APFSDS can penetrate more than 1,000 mm RHA and DU armour offers protection of more than 1,000 mm RHAe vs KE - both of these things are mathmatical impossible. Pure uranium/DU is in terms of tensile/yield strength and hardness inferior to RHA, while weighing more than twice as much. According to some posts on the TankNet alloyed DU offers per thickness 1.3 - 1.4 times the protection of normal armour steel, but still weights twice as much. Against shaped charges (were the penetration power is depending on the target density) DU can offer two to three times the protection of armour steel of the same thickness.
Some Leopard 2s (Strv 122, Leopard 2A5DK, Leopardo 2E, Leopard 2A6HEL) have been fitted with thicker glacis armour and will likely survive hits from 125 mm APFSDS. This armour was originally developed as part of the normal Leopard 2A5, but not fielded due to weight constraints. Still it is part of most Leopard 2A7 prototypes.
Methos, I know about all these developments which you mention. And I never wrote that NATO has only anti-tank rounds. I just meant that in Afghanistan and in Chechnya, 90% of ammunition of Russian tanks was high-explosive rounds. But in Iraq and Afghanistan, most of the ammunition Abrams was the anti-tank rounds, but I certainly know what Abrams also used and other types of rounds (like HE rounds).
In Iraq the U.S. did at least carry M1128 carnister and M830A1 MPAT rounds with them, even though I don't know how much.
The U.S. operated tanks for the first time in Afghanistan from late 2010 on and bough German HE-ABM rounds in early 2011. At the time where the U.S. tanks arrived there were no enemy tanks, the government was already on NATO side. So they carried very few anti-tank rounds with them.
However, I believe that destroying the house with enemy infantry inside, the Russian tanks can do better than Abrams. Because Russian tanks are equipped with autoloader who does not get tired (but a man on the spot of autoloader eventually become tired).
A human loader will become tired after some time, but for engaging tanks or houses you will only need a small amount of rounds (in worst case three for a house) - way to less to make a human loader become tired easily.
I believe that the size of frontal projection of tank give affect on his protection.
This picture has been shown to Putin by the designer-engineer of the T-90MS.
http://www.vif2ne.ru/nvk/forum/files/Harkonnen/(110918145938)_122276-1-f.jpg
The image is just badly made, way to biassed. Yes, the size of a tank is relevant for protection, but not the total size but the size of the weak points. If we take a look at the armour thickness we will see that some areas are less armoured than others. E.g. the mantlet of most tanks is just 40 - 45 cm thick and can likely be penetrated.
In case of the M1 the mantlet and the drivers position (where the turret armour is thinner) are the weak spots. The mantlet seems to be about 40 cm thick, because the mantlet includes also the gun-mounting partially (i.e. a 15 - 20 cm steel block), so total armour protection will be ~ 30 cm composite armour + 20 cm steel armour. In case of the Leopard 2 the weak sposts are the EMES-15 location (there the armour is only 65 cm thick) and the mantlet (42 cm thick armour but the gu mounting is located behind that, so some 57 - 62 cm total armour thickness). The later Leopard 2A5/6 have thicker mantlet armour (about 20 cm thicker) and a different location for the EMES-15 (which means that the armour in front of the EMES-15 could be raised), so weak-spots are more or less eliminated.
This image is a comparision of weak spots of two contemporary tanks, the T-72B and the Leopard 2A4. The base images for T-72B and Leopard 2A4 are for scale!
About the protection of the tank T90.
According to NII Stali (Scientific Research Institute of Steel), who designed armor of T-90, defeat of the T-90 with the ERA Relikt by APFSDS M829A3 is possible from distance not more than 1.2 km.
NII Stali has designed various types of armour and often done reasonable estimates. Still I doubt that they can have proper datas for NATO APFSDS.
ERA does not have a fixed efficiency, it just decreases the efficency of the enemy APFSDS. So it's still possible that a hit at the turret center (where the armour is below the maximum thickness) can defeat a T-90.
Also, not only Relikt, for customers, to decreasing the protection of the T-90, the Russian are ready to provide camouflage kit Nakidka.
(Nakidka not unique, but very good. The Russian Nakidka camouflage kit was designed to reduce the Optical, Thermal, Infrared, and Radar signatures of a tank, so that acquisition of the tank would be difficult. According to Nii Stali, the designers of Nakidka, Nakidka would reduce the probabilities of detection via "visual and near-IR bands by 30%, the thermal band by 2-3 fold, radar band by six fold, and radar-thermal band to near-background levels.)
NATO has Barracude MTS as equivalent. Can also be seen on
current Leopard 2A7 protoypes (Duel Ops).
Of course I know that the autoloader is a reason why Russian cannot do very long size APFSDS like M829A3.
And also I know Russian tray increase efficiency of their APFSDS as follows:
To increase the speed of penetrator, autoloader can use extra charge of gunpowder.
The amount of propellant in a NATO APFSDS and a Russian 125 mm APFSDS (both parts) is about the same.
More longer APFSDS does not fit in traditional T-72 autoloaders. But the autoloader upgrade is straightforward and is assumed to have been carried out on T-90A tanks that are therefore compatible with 740 mm APFSDS. (The same autoloader I think also has T90MS.)
The new gun. The 2A46M-5 gun design made it possible to reduce technical dispersion of shells of all types by 15% in average and to increase effective range of fire. (2A46M-5 it is gun of T-90MS)
That's all nice but still no advantage over the NATO. It just shows that the T-90 will reach the same abilites as NATO tanks.