Main battle tanks (part 7) - Merkava, Israel
Features of Israeli tank building
This may seem strange, but the main restrictions on the weight and dimensions of tanks are imposed by rail transport standards. Tank units need to be quickly deployed over long distances, OBT should not create problems for railway platforms, pass under bridges and tunnels. In Israel, they initially expected to use the tank only in their compact territory and to carry out transport using special auto platforms. Dimensions and weight do not hang over the designers, so the Merkava is today one of the heaviest tanks in the world. The mass of the Merkava Mc4 modification reaches 65 tons, in a number of sources the value in 70 tons is indicated.
The features of the proposed theater of operations set the narrowness of the geographical and climatic capabilities of the tank. "Merkava" is not intended for operations in conditions of winter cold, off-road in the middle lane, tropical humidity, swamps. Its element is gently sloping mountains, dry desert and subtropics, which reduced the export potential of the car to a minimum.
Influenced by the construction and the fact that the Israelis prefer to conduct defensive actions from the positions located on the slopes of heights. Based on this method of firing, it was assumed a high probability of hitting the shells in the tank turret. That is why the designers tried as much as possible to move the combat compartment from the tower into the body and reduce its frontal silhouette.
Another factor was the increased concern for the survival of the crew of a combat vehicle. The crew was placed slightly lower and behind than on most modern tanks. The front of the tank is fitted with an engine and transmission, which are protected by heavy cast armor plate, on the inside of which a second armor plate with a thickness of 60 mm is installed at some distance. The cavity between them occupies the fuel tank. For the engine is mounted another armor plate thickness of 20 mm. Because of this, the crew of the tank was provided with serious protection from frontal hits.
Much attention during the development of the tank was paid to the issue of convenient work of tankers. The designers, in fact, proceeded from the concept that a tank is a crew house during a war. In particular, a very controversial concept of round-the-clock use of a tank was proposed, for which the 2 crew was supposed to be placed in it - one is fighting, the other is resting. If necessary, the wounded could take the place of the backup crew. This concept led to the creation of an unprecedented in the modern world tank building zabronevogo volume of the hull, which in turn affected the size of the tank. The possibility of transporting people inside the MBT put a number of experts at a standstill, some of them at one time even tried to separate the Merkava into a separate subspecies of the BMP tanks. The fighting compartment of the tank can be used to transport military personnel and their property, and also allows the wounded to be evacuated from the battlefield. In the stern armor sheet is a hatch width in 600 mm., Which opens access to the fighting compartment.
To date, known 4 modification of the tank. The very first "Merkava Mc1" is no longer in service with the Israeli army. The main tanks of the Israel Defense Forces are the McNXX, Mc2 and Mc3, respectively. The first models of the tank Mk4 and Mk1 were armed with 2-mm American gun МNNXX, had less powerful engines with a total power of 105 hp, a simpler FCS, and also, as shown by the fighting, in which they had to take part, insufficient booking. In the process of upgrading the tank, Israeli experts took the path of increasing all the listed parameters and ridding the machine of the identified childhood diseases. Consider the most modern models Mk68 and Mk900.
Merkava Mk3
According to British experts, the Merkava Mc3 appeared almost new tank, and not the modernized Mc2. Still, the key issue for the Israelis was the increased protection of the combat vehicle. At the MBT "Merkava Mc3" modular armor was used. The modules - special armored blocks - were fastened to the hull and turret of the tank with bolts. They were strengthened almost all vulnerable places of the machine. Onboard screens received more advanced armor. Unlike the West German Leopard-2 or the Soviet T-80U, in which the reinforced armor of the onboard screens is located only in the driver's zone, on the Merkava the resistance to onboard screens is the same over the entire length of the hull. The turret of the tank is covered with modular armor on the top and sides.
One of the advantages of using modular armor is the ability to quickly replace the affected elements even in the field. Regarding the use of modular armor, Israeli General Israel Tal noted that this tank will always be forever young, it will not grow old, its armor can always be replaced with a newer and more perfect one. Particular attention was paid to the full range of protection of the machine, which was made in view of the fighting in Lebanon in 1982 year. The security of the tank from the stern was increased due to the installation of armored fuel tanks in the stern armor sheet instead of battery and FBU compartments (ventilation and filtration unit). At the same time, the batteries were transferred to the nadgusenichnye sponsons, and the filtering unit was installed in the aft niche of the tank tower.
As the main weapons The 120-mm gun was installed on the tank, which significantly increased its firepower. This tool is in many respects similar to the German Rh-120 and the American M-256, while the barrel rollout system on the Israeli gun is more compact. Shooting from this weapon is possible by all types of ammunition of German and American production. Ammunition guns consists of 48 shots. The barrel of the gun has a thermo-insulating casing, and in its middle part an ejector is used, which serves to remove powder gases. Its dismantling does not require the removal of the thermal insulation casing, and the replacement of the gun barrel is made without dismantling the turret.
Tank shots are stored in individual containers for greater reliability. Five shots are immediately ready for battle and are located on the rotating polik of the tower. The shop and the semi-automatic ammunition supply system for the gun are part of the AZ being developed. Now the loader loads the ammunition shop from individual containers. Raising shots is carried out using a foot drive, after which the loader manually sends them to the breech. Israelis believe that such a scheme allows to achieve a compromise between the relatively simple loading mechanism, which facilitates the work of the gunner and increases the rate of fire, and the requirement of the military insisting on the presence of a tank crew of 4 people.
The tank was improved fire control system, produced by Elbit. The gunner received a new sight with the possibility of automatic tracking of the target, with axis stabilization independent of the position of the gun barrel, with an 12-multiple increase and a laser rangefinder. Night channel sight gunner has 5-fold increase. The commander also received a stabilized periscope sight with 14-4 multiple approximation and an independent night channel. The sight of the tank commander is connected with the gunner's sight by the optical channel and allows the commander to target. Electro-hydraulic guns and reversal of the turret were completely replaced with electric ones, to increase safety.
For the first time in stories Western tank building, the tank received an electromagnetic radiation warning system. 2 wide-angle sensors are installed along the sides of the aft part of the turret, one is above the gun barrel. All 3 sensors provide a circular coverage, transmitting information about the azimuth of the radiation source to a small display located next to the commander's workplace.
For the mobility of the tank answered more powerful forced engine AVDS-1790-9AR - 1200 hp (models Mk1 and Mk2 had engines hp power 900) and advanced hydromechanical transmission. The use of such an engine allowed the 63-ton car to accelerate along the highway to 60 km / h. The first tanks of this model began to arrive in service with the Israeli army at the beginning of the 1990-s, the cost of one tank was 2,3 million dollars.
Merkava Mk4
The new Israeli MBT Merkava Mc4 was first shown to the public in 2002 year. In 2004, the army received the first battalion equipped with these tanks. The configuration of the armor modules of the turret was significantly reworked on the tank, the tank gun received a mask. The reservation of the roof of the tower, which now covers the entire roof, and not just the front part, was significantly strengthened. As a result of these measures, the loader lost the hatch, only the hatch of the commander remained on the roof. The mass of the tank reached 65 tons.
In order to maintain mobility in the tank, the diesel 12-cylinder water-cooled engine (all previous ones were air) was installed for the first time in 1500 hp. The components of this diesel engine are manufactured by the German company MTU, then assembled in the United States under a license from General Dynamics Land Systems and exported to Israel under the name of the GD 883 propulsion system. The engine is mounted in a single unit with a Renk RK 5 325-speed automatic transmission.
The tank was equipped with an improved 120-mm gun, designed for increased pressure of powder gases. Together with the gun, the new improved electric drum mechanism is now working, feeding shells to the loader and 10-designed shells, the rest, as before, are stored in individual refractory containers in the stern of the tank.
The tank control system has been improved. In particular, the thermal imaging channel, the automatic target tracking device and the panoramic sight of the tank commander were further developed. A video camera was placed in the stern of the tank, which helps the driver navigate when reversing.
For the first time in the history of Western tank building, the Merkava McNUMX received a complex of active defense against anti-tank missiles - Trophy. The complex works in automatic mode and tracks targets in the 4 degrees sector. At a distance of several tens of meters 360 radar mounted around the perimeter of the tower detect anti-tank ammunition and give the command to destroy it. The estimated cost of the tank is 4 million dollars, the estimated cost of the Trophy active protection complex is no more than 3,7% of its value.
Sources used:
www.btvt.narod.ru/4/morkova/merkava.htm
www.armor.kiev.ua/Tanks/Modern/Merkava/mer1/
www.iraq-war.ru/article/100887
www.army-guide.com/eng/product2050.html
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