Type 74 MBT - Protection
The turret is a cast structure (manufacturing method in which metal melted at high temperature is poured into a mold and molded), and has a round shape that takes into account bullet avoidance (distributing the impact of the bullet and allowing it to ricochet) when hit. Inside the turret is the gunner on the right front, the vehicle commander behind it, and the loader on the left.
Unlike the turret, the body is a welded structure, and like the turret, it is made at the expense of operability and comfort. As for the layout, the driver's seat is on the left side of the front part of the vehicle body, the battle compartment is in the center behind it, and the Mitsubishi 10ZF22WT air-cooled V-type 10-cylinder diesel engine is mounted on the rear part of the vehicle body. This engine is a power pack integrated with the transmission.
The Type 74 tank is the first domestically produced tank to have the ability to defend against NBC (Nuclear, Biological, and Chemical) weapons. During the Great East Japan Earthquake, Japan mobilized to remove the rubble that had become an obstacle to water discharge cooling after the hydrogen explosion that occurred at the Fukushima No. 1 Nuclear Power Plant, using a dozer blade attached to the front of the vehicle. This is possible because the tank is covered with a thick steel plate and is equipped with the air filter of the NBC protection device. However, even with these equipments, radiation exposure is not completely avoided, just by reducing the dose.
The Type 74 tank has a filter cartridge type CBR (chemical, biological, radiological) protection device, and the CBR protection filter consisting of a prefilter, particle filter, and gas filter purifies the contaminated air and sends it to the inside of the vehicle, Pressurization prevents the inflow of contaminated air. However, in this case, it is necessary to attach a breech plug to the closing machine of the main gun, so the main gun cannot be fired. For this reason, the NBC protection device of the Type 90 tank uses a method called a line type that directly sends purified air to the crew's protective clothing without pressurizing the entire interior of the vehicle. (Now called NBC instead of CBR)
During the Great East Japan Earthquake in 2011, two Type 74 tanks equipped with dozers were used to remove debris from the Fukushima Daiichi Nuclear Power Plant, and Type 78 Tank Recovery Vehicles. is dispatched with However, it was not actually used because remote heavy equipment was soon prepared. With the armor of the Type 74 tank, alpha rays and beta rays can be prevented from all around the radiation, and gamma rays can be prevented by about 1/10 with the 80mm steel plate on the front armor, and 25 on the sides and rear. It is thought that even a steel plate of up to 35 mm can be attenuated to 1/2 to 1/3. However, although the NBC protective equipment equipped on general combat vehicles, not just Type 74 tanks, can prevent the inflow of radioactive materials, it is possible to attenuate radiation such as gamma rays and neutron rays, but it is not possible to completely prevent it. Since I can't do it, if I can use a remote heavy machine, it's certainly better to use it.
The body is a welded structure made of rolled steel plates, and has a good bulletproof start with an inclination angle of 65 degrees at the upper front of the body and about 55 degrees at the lower front of the body. Although the thickness of the armor has not been disclosed, it is estimated to be about 80mm at the front of the hull from welding marks, etc., and the apparent thickness against horizontal trajectory due to the slope of the armor is about 189mm at the upper front of the hull and 139mm at the lower front of the hull. In addition, it is estimated to be about 35mm at the side of the car body and about 25mm at the rear of the car body. The turret is cast with bulletproof cast steel, and has a curved and excellent bulletproof start. The armor thickness of the turret mantlet, which has a high hit rate, is estimated to be about 195mm on average from the size and weight, but it is said to have a maximum thickness of 248mm. Comparing these values to tanks of the same generation, the frontal armor is thicker than the German Leopard 1 and French AMX-30, and thinner than the American M60 and Soviet T-62.
However, second-generation tanks from other countries generally have armor reinforcement modifications and ERA installations to counter HEAT bullets such as RPG-7 , and the Type 74 tank has no such modifications at all. Uncertainty remains about power.
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