밀리터리Rep 2008.04.11 23:07
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Black Eagle (Obiekt 640) Armor Estimate

Preliminary notes:

As the tank design is not complete yet, it is impossible to tell what would be used in the final package. However, thanks to a recently released patent on the turret (RU 2169336 C2), there is a chance to come up with a rough idea of possible protection levels. The estimates presented below are based on extremely conservative assumptions, that essentially rely on circa 1987 protection levels and can be put in place without any additional R&D allocation whatsoever. It is unlikely that the finished vehicle is less protected, and quite likely it is protected better.

According to the patent and based on the estimated turret ring diameter of 2.5m (like on T-80U), the frontal section consists of a frontal plate 80-100mm thick, followed by 170mm insert, and 60mm back plate, inclined at up to 70°. The roof section has a frontal plate 60mm thick, 100mm insert, and 40mm back plate, inclined at 84-86°.

Considering an obvious similarity of this array to the traditional glacis of late Soviet tanks, let's assume an insert similar to T-80U glacis. Again, this is nothing but an estimate of armor potential using the technology that is immediately available.

The T-80U glacis insert is presumably made up of 30mm sheets of armor glass fiber (STB) interleaved by 5mm steel. STB in this layout offers TE of 0.45 vs KE and 0.75 vs HEAT, and it should be possible to place 5 STB plates in the front array and 3 plates in the top one.

It has always been intended to add ERA above the main armor and indeed armor shape lends nicely to this. Let's assume "Kaktus" ERA developed by NII Stali and demonstrated on the recent shows (increase of APFSDS protection up to 1.6 times and HEAT protection up to 2 times)

Glacis thickness is unknown, but it is expected to be considerably thicker thanks to extra hull length offered by an additional roadwheel. However we will refrain from any hypothesizing for the time being, as the new hull with reconfigured front has not been presented yet.

Lower hull probably remains 80mm RHA preceded by 10mm HHS dozer blade inclined at 64° (LOS modifier of 2.28) or 21cm KE and HEAT armor, plus a rubber flap typical of T-80U that may offer some small extra HEAT protection (4-5cm).

Mantle thickness UNKNOWN, but probably only provides protection against autocannons as hit there is limited to firepower kill.
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posted by 지나가다가