Russia is planning to modernize its 150 T-72 main battle tanks (MBT) to the T-72B3M version also called T-72B4. According to Russian military engineers, the upgraded T-72 MBT will be comparable to the more advanced T-90, but with much lower costs.
T-72B3M/B4 of Russian team at The Final of International Russian army Tank Biathlon 2014
Currently, Russian armed forces use a wide range of T-72 MBT variants. The T-72 is a russian made main battle tank that entered production in 1970. It is a further development of the T-62 with some features of the T-64A (upgraded version of basic T-64) and has been further developed as the T-90.
Russia will spend 2.5 billion rubles ($37 million) to upgrade 150 T-72Bs to the advanced B3M standard, Uralvagonzavod deputy director Alexey Zharich told the Russian newspaper Izvestia.
The T-72B3M (T-72B4) will be upgraded with lot of new components including the new cannon 2A46M5 125-mm smoothbore gun as well as the new Sosna-U sighting system paired with the 1A40-4 fire-control system. The tank will also receive a new ballistic computer to increase accuracy.
Independent commander’s PK PAN sight
The most notable upgrade is the stabilized, panoramic, independent commander’s PK PAN sight with integrated thermal viewer, thought to have similar specifications to the Sosna-U. This gives the tank the ability to engage targets in the “hunter-killer” mode. Source wikipedia.org
2A46M5 125-mm smoothbore gun
2A46M5 125-mm smoothbore gun (the lower cannon) @bastion-opk.ru
The T-72B3M will be equipped with an independent panoramic sight for the tank’s commander, with its own thermal imaging device. (See above)
U sighting system paired with the 1A40-4 fire-control system for gunnerSosna-U installation in a T-72 tank @vsr.mil.bySosna-U installation in a T-72 tank @vsr.mil.bySosna-U installation in a T-72 tank @vsr.mil.by
The tanks will also get the new Relikt explosive reactive armor. It will replace the old Kontakt-5 system and is expected to be two times more effective.
“Classic” ERA from the USSR and Russia 4S22 (Kontakt-5)
It’s good to start describing “Nozh” with a point of reference first – for example heavy reactive armor types designed in the USSR/Russia, 4S22 (Kontakt-5) and 4S23 (Relikt). The overall working principle of every classic ERA is similar – it’s based on movement of metal elements of the ERA cassette caused by an explosion of reactive elements , this inflicts side stress disrupting the cumulative jet from a HEAT round or bending (optimally breaking) of an incoming KE penetrator. This overall principle is realized by different cassette’s structure. First, let’s look how Kontakt-5 ERA provides protection for Object 188 (T-90S tank).
plate, violet – elements preventing the explosive inserts from moving, light
green – explosive inserts, light blue – cassette’s back plate and mounting
points. The explosive inserts are shown below the scheme. All pictures belong
to the author if not stated otherwise.
Supremacy of Soviet armor?
The introduction of heavy Kontakt-5 ERA in 1987 caused a gap between the capabilities of NATO’s rounds and the armor of Soviet tanks. From theoretical point of view APFSDS and tandem HEAT warheads capable of penetrating heavy ERA were introduced in 1992-1994 thus creating an almost 6 year disproportion between the Soviet “shield” and the NATO’s “sword”. Another fact worth noting is that the basic armor of Soviet tanks was already largely immune to APFSDS rounds, majority of RPG’s and some ATGM’s warheads. A good example is the basic armor of the hull and turret of the export version of Object 478B (T-80UD from 1991) including both steel and ceramic elements it is over 620 mm RHA vs APFSDS and over700 mm RHA vs HEAT. By adding Kontakt-5 ERA the protection level is further increased – especially against HEAT warheads. Similar high protection is for T-72B model 1989 when the sum of only passive hull armor elements gives over 600 mm RHA vs APFSDS.
Presented situation was theoretically very dangerous for western AT rounds but it was lowered by few factors – rather large weak zones in the frontal armor and not thick enough coverage by ERA cassettes. In reality every tank has various weak zones which can be penetrated by older ammo. In case of T-72 family these are: gun mantled, gun mounting area, coaxial MG, turret roof, commander’s observation copula, turret ring and the lower hull glacis.
These weak zones are shown in a résumé of an article printed in the internal bulletin
of the Armored Forces of the USSR. The article states about advantages of tanks
with welded turrets in terms of better crew survivability. What’s important is
that T-72B (Object 184) was used as a reference point and its weak zones were
T-72B weak zones
The areas marked in red were considered weak zones and could be
penetrated by 3BM26 APFSDS which was introduced in 1984 and penetrates 380-410
mm RHA at 2000 m for 90 degree sloped target. The marked areas were penetrated
by this projectile from:
– driver’s hatch – 1700 m,
– turret roof – 3700 m,
– commander’s copula – 3900 m,
– gun mantled, gun mounting area and coaxial MG – 1650 m
Photo : Vitajin Kuzmin.
zones” from the Bulletin of the Armored Forces from 1991. Except for a small
portion of the roof the areas do not cover each other almost at all. Photo : Vitajin Kuzmin. @liveleak.com Written by : militarysta Translated by : Bzdziuchanson
Relikt explosive reactive armor
Relikt consist of single explosive tile, sandwiched between 2 plates. At event of hit, explosive detonates and “push” plates in opposite directions. And thats all, there is no second explosive charge. IIRC NII Stali noted that there is a sort of damper layer on armor itself (between ERA main part and armor plate of a tank), to soften up a force from second (“inner”) plate hit. @sturgeonshouse.ipbhost.com
New Relikt explosive reactive armor @sturgeonshouse.ipbhost.com
Nozh offers slightly higher protection than Kontakt-5 against some warheads simply because K-5 module have 0.5 kg of explosives, while one block of Nozh is filled with ~2 kg of explosives. Relikt also have about same amount of explosive filler, but Nozh is mounted directly on tank armor, while Relkit is mounted at some distance, with second inner plate and damper mounted on armor plate to protect it from damage by ERA detonation. @sturgeonshouse.ipbhost.com
Furthermore, the upgraded version will be powered with the new V-92S2F engine and deliver 1,130 hp. It will replace the old 780-hp diesel engine. The new engine is paired with an automatic transmission system and improved drivetrain to improve the tank’s mobility. @armyrecognition.com
Modernized tank t-72B (t-72B3 with additional options). MILEX 2014
Модернизированный танк Т-72Б (вариант Т-72Б3 с дополнительными опциями) – Modernized tank t-72B (option t-72B3 with additional options).
Основные новинки представленного танка заключаются в двигателе (1160 л.с. с автоматом переключения передач), новом панорамном прицеле командира с лазерным дальномером (ВОМЗ), установке телевизионной камеры заднего обзора на кормовом листе корпуса танка и ряде других усовершенствований. – The main novelties introduced by the tank are in the engine (1160 HP with automatic gear), new panoramic Commander’s sight with laser rangefinder (VOMZ), installing rearview camera on the tank hull fitted sheet and a number of other improvements.
Решение весьма неудачное, т.к. полностью препятствует усилению бортов динамической защитой – Log an unditching beam placed on the right side (on-the-go tank) in connection with the installation of the rear view camera. The decision is very unfortunate, because it prevents the strengthening boards dynamic protection.
Установка ДЗ на башне аналогична Т-72Б3. У наводчика установлен многоканальный прицел «Сосна-У» разработанный белорусским ОАО «пеленг». Прицел не уступает уровню современных мировых аналогов. – Installation of the DMZ on the tower is similar to the t-72B3. Gunner installed multi-channel sight “Pine-u” developed by Belarusian JSC “Peleng”. The sight is not inferior to the level of modern analogues.
Установка ДЗ «Контакт-5» на ВЛД. На первом (слева) фото видна установка ДЗ, вся верхняя плита носового узла корпуса не прикрыта. Чем думали конструкторы УКБТМ при создании такой конструкции остается загадкой. На фото справа крышка для установки элементов ДЗ с установленной резиновой прокладкой. – Setting DMZ “contact-5” on VFD. The first (left) photo visible installation of the DMZ, the whole top plate bow site not covered. Than thought FEDERAL designers when creating such a construction remains a mystery.
In the photo on the right cover for RS installation with installed rubber gasket.
На фото виден панорамный прицел командира. Удивляет небрежность изготовления, которую читатели могут увидеть на фото по торчащим проводам и платам. – In the photo visible commander panoramic sight. Surprising negligence of manufacturing, which readers can see in the photo of filmmaker Theo van Gogh wire and boards.