Experienced main battle tank Object 172-2M (ROC Buffalo)

Experienced main battle tank "Object 172-2M" (ROC "Buffalo")

Along with work on the completion and production of a batch creation of the T-72 "Ural" (to 172m), CB UralVagonZavod from 1971 to 1975 year led development work on the "Buffalo", aimed at improving the forthcoming ob.172M. First experienced standard the car was built in 1972. His radical conversion received by the 1st of experienced objects 172. All within the framework of this work have been built seven experimental samples of the machine in 3 form factors have received code "Object 172-2M" and "Object 172m-2M". Second, third and fourth standards already had experienced in their own database design ob.172M. The standard number 1 had combined with 15 tanks opytneyshemi ob.172M take the role of large-scale trials conducted in the summer and autumn 1972 under the control of General Yu.M.Potapova. The subsequent three copies have been run-in period of 1973-74. in different regions of the country. All done by the time the standards in the period from June 1972 to June 1974 carried out tests under different weather and road criteria and were more than 15,000 km each, with all this worked engines from 538 to 664 hours each and were in good condition.

Experienced main battle tank "Object 172-2M" (ROC "Buffalo")

The main challenge in implementing the work has been a dramatic increase in the level of performance characteristics of the machine. Implementation of thought led to an increase in weight up to 42 tons compared with 41 tons facility 172m. But the increase in mass of the machine has not led to a deterioration of the dynamic features. Installing forced to 840 hp In the motor-46F (it later B-67) produced by CTZ allowed not only to make up the growth of the mass, and to raise the power density of up to 20 hp ton weight. Forcing the engine was carried out by means of the least — processing design supercharger. With all of this fuel consumption is actually not changed. Since at the highest mode in the power-consuming 67 g per 1 175 ps / h against 172 g of the same mode at-46 mounted on ob.172M. Together with a significant increase in fuel capacity (additional external on the left fender), it is possible not only to save, and the increment in store running. In the end, he headed for a record high — 750 km on the highway. Increasing power density also had a positive impact on increasing the average speed, especially on rough terrain. It also facilitated the introduction of the suspension with increased dynamic swing rollers, hydraulic shock absorbers inflated energy, tests were made to change the mode of installation of torsion bars and balance beam in order to better distribute the load. BCP has been strengthened, improved working water pressure in hydraulic control system.

Experienced main battle tank "Object 172-2M" (ROC "Buffalo")

Displacement motor septum toward the stern, which was achieved through the seal assembly nobody MTO allowed to change the placement of pilings BC BW increment ammunition with 39 rounds to 45, to make packing more comfortable. More comfortable styling is allowed to create a manual loading of aimed fire at a speed of up to 2 shots per minute to 1 m for 44 seconds. 172m at the facility (according to the test tanks ob.172M 15 in 1972).

Severe events were conducted in improving the armor and structural protection.
The hull: VLD resistance was improved by the configuration of the proportions of the components of combined protection (increased thickness of the rear sheet iron). Installation of additional iron sheet on top of increased hardness konusnovidnogo section is allowed to increment the physical dimension of protection in a frontal projection and the angle increment VLD from 68 to 70 degrees, which in turn made it more modern premises to bounce BPS. In the end, the package scheme VLD looked after images of 70-mm steel + 105 mm STB + 40 mm steel angle of 70 °. Along the sides of the body established iron platoon screens (feed section rubber-made screens), covering the board almost all the way to level down the road wheels and external fuel tanks for the rest of their height upwards. Diversity protection circuit board looked like this: 70mm +16 mm metal bead screen (district BO) and 70-mm board + 5-mm metal screen (near ITO). In addition, leaving the possibility to set a standard folding screens — "mugs", overlapping board with nasal projection, bearings.

The tower: improving the protection was carried out in two steps. In the first step, one-piece cast steel tower had iron platoon screens from the perspective of + / — 30 degrees. Onboard view of the tower had an external structural protection in the form of a large box spares and set before him the Iron platoon screen. Feed projection tower and escaped drawers and exterior zip obveskoy (trumpet OPVT, roll from overcoat canvas cover, wind deflector, pencil-bath under the gun). In the second step envisaged to install cast turret with a combined carrier. In general, the frontal projection of the object 172 2M providing protection from 125mm sabot projectile with a tungsten-carbide tip having a meeting point speed to 1600 m / sec. Armor ordinary T-72 only rescued from 115-mm shells at a rate of 1400 m / s. Protection against chemical weapons on the frontal part of the hull and turret increased by approximately 10-15% and was equivalent to 500 … 520 mm armor steel of medium hardness. The standard T-72 (the tower with the "corundum balls" — 1975.), The figure was only 450 mm.
All machines are equipped with anti-aircraft machine gun. First model had a machine gun closed from the T-64A, the other equipped with a standard T-72 open Zu-72.

Experienced main battle tank "Object 172-2M" (ROC "Buffalo")

In the middle of 1974 began testing even more powerful version of the tank "Object 172m-2M", with improved devices monitor the battlefield and the new aiming system. On the 6th and 7th duplicate machines were installed laser rangefinder sight TPD-K1, night sight "Buran-PA", new monitoring devices commander and gunner, anti gun "Jasmine 2" with electric drive in the horizontal plane (trivial stabilizer 2E28M had only hydraulic). When ready, the machine was to be installed commander's supervisory unit "Agat-T." In addition, the improved 125-mm gun 2A46M (D-81TM) differed over the highest accuracy at the expense of reduced the variation in the trunk
and install thermal-insulation cover on it. Past events have allowed to increment the number of hits for firing on the move at a range of 1600 … 1800 m Target type "tank"Up to 80-100% (according to the results of the tests ob.172M 15 tanks in 1972, the number of hits for firing on the move amounted to 50.4%). The mean point of impact at a height at a distance of 1 km in the criteria thermofilter rain cover reduced to 15 cm — 3.6 m versus without it. Additional devices to increment the static angle of visibility commander from 144 to 288 degrees, the gunner — respectively from 60 to 150 degrees. In order to disguise the tactical in addition to the TDA on the machine has been installed smoke-screens 902A "Cloud".
In parallel, in the years 1973-75 in Tagil KB have been working on the tank with a 130 mm rifled gun 2A50 (LP-36) developing KB Motovilikha plants (Perm, gl.konstruktor Kalachnikov YN) and its smooth-LP-36B variant a 130-mm guided missile (joint proposal SRI-6 (in posl.NIMI) and CB Nudelman).

But the engines on tanks № 5-7 were not working very tightly. In contrast to the first 4 they worked an average of just under 200 small hours. The main problems were related to the release of oil from the oil separator and the loss of cooling water. In 1975, the designers of CTZ diesel V-67 (formerly known as the B-46F) was finalized urgently identified defects have been remedied. In 1976, the army was supposed to carry out tests for 10 tanks "Object 172-2M "and" Object 172m-2M ". During the four-saturated operation ob.172-2M and about. 172m-2M in different road and climatic criteria assemblies, mechanisms and systems of tanks showed higher reliability and durability, providing testing and tank movement without speed limit occurred in the course of the test, the ambient temperature from -38 ° C to +40 ° C .
Tests have shown that the resource diesel V-46F/V-67 more than 500 hours; reinforced gearboxes, guitar, drives to the fan starter-alternator and compressor, fan cooling system, support rollers, guides and driving wheels, torsion bars, hydraulic shock absorbers — 15 thousand km, caterpillar tracks — 6,5 thousand km in summer and 10 thousand kilometers on the frozen ground. Unification factor in relation to the "Object 172m" was about 88%, so that the transition to the production of more powerful models are not sought re production plants. In the coming two or three years, we could expect adopting a tank "Object 172m-2M "- an improved version of the T-72.

But this did not work for a variety of circumstances bearing faster administrative and political nature. Yet, something with "Object 172m-2M" already in 1975 was transferred to production vehicles: for example, reinforced boxes, additional vision devices. Everything else was needed, and instead of the start of production "Object 172m-2M" Decision of the Central Committee of the CPSU and the USSR Council of Ministers № 1043-361 of 16 December 1976 were instructed to work on the creation of the "T-72 tank with exaggerated features." Recent or repeated existing TTX "Object 172m-2M" (engine capacity of 840 hp, a laser rangefinder sight, ammunition 44 rounds), or even inferior to him. Namely, it was proposed to throw the gun 2E28M stabilizer, night sight TPN-3-49.

Experienced main battle tank "Object 172-2M" (ROC "Buffalo")

As a curiosity it is worth mentioning two commonplaces legends associated with the work on the project of 172-2M. First legend says that the "Buffalo" (as with the code informally called OCD experienced machine) was mock-T-72 "Ural", which is fundamentally mistaken though because ob.172-2M was created specifically as already 172m modernization of the object, ie T-72 "Ural". According to the second legend naming of "Buffalo" offered to call in a series of tank T-72 (ob.172M). Tipo proposal received from the head designer Venediktova VN to the management of the country, but was rejected because of his own "animal" origin, which caused moral nasty associations with names zabugornyh tanks (assumed, probably German cars), and was replaced by a neutral and patriotic — "Ural". But this is not true, because again it is assumed that the "Buffalo" was a mock "Ural". The possible occurrence of both legends prerequisite would be that the work on the subject chronologically 172-2M conducted initially with the work on ob.172M and suitably overlapped in memory of veterans. It should also be added that in the discussions, memoirs, and from time to time in the literature, only associative, is "Buffalo" wrong call "Bison" — confused animals.

At the current time first experienced the standard "Object 172-2M" is located in the museum of armored vehicles in Kubinka almost rots in a landfill. At the request of the energetic transfer it to a museum Uralvagonzavod, GABTU responsible categorical denials.

MODIFICATIONS
• Object 172-2M first ace standard — the conversion is made by an experienced reference ob.172 in turn acquired by the alteration of the T-64A
• Object 172-2M second, third and fourth seasoned standards — are made on the basis of the design ob.172M
• Object 172-2M fifth most experienced model — made on the basis of the design ob.172M with the installation of V-67 engine
• The subject is 172m-2M second and seventh seasoned standards — are made on the basis of the design ob.172-2M. Significantly improved SLAs, arms, installed 902A, engine B-67
• Object 172-3M — a project based on the design ob.172-2M with the installation of 130-mm rifled gun 2A50 (LP-36).

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