T-39 super-heavy breakthrough tank
Did not have time T-35 to enter the armament, as already on August 13, 1933, after the approval of the modified system of armored weapons, decided to replace it with a new combat vehicle. The Reason for such soon abandonment of the production of the "35th " was its exceptional complexity, which was supplemented by numerous defects and "Childhood illnesses ", which could not be disposed of during the whole period of its Use in ABTV. However, at the same time stipulated that until the new tank does not go to the series T-35 release should not interrupt. Thus, in early 1933, at the request of the headquarters and UMM RKKA, new requirements for the breakthrough tank were worked out. First of all, it was to strengthen armament, because the capacity of the 76-mm tank gun was clearly lacking to overcome well-fortified defensive strips and long-term fortifications. Instead, they planned to install guns of a much larger caliber, like "gun caliber 107 mm or heavy howitzer caliber 152-mm ", which brought the firepower power of the tank to the level of Hull artillery. This step has also led to a significant increase in mass, which at the initial stage of registration of TTK amounted to 75 tons. However, preliminary calculations showed that in case of anti-reservation with the thickness of armored plates 15, 20, 25, 50, 75 mm, which was to withstand the hit of the shells of divisional artillery, it is impossible to do it. As a result, the weight of the tank rose to 90 tons, and it was not limit. To move such a machine would need a very powerful power plant-the output was found by installing aircraft engines M-34 with a capacity of 850 hp or Hispano-Suiza 18 Power 1150 HP By The most optimistic estimates of the speed of the tank in the first case Could make 24 km h, in the second-33 km h. As A safety option was set the task to build and test the steam engine, fitted for installation on the tank. For This purpose even had time to allocate one serial T-35, but about its tests of the information has not remained. The Design of the super-heavy breakthrough tank named T-39 was commissioned by the design team under the supervision of N.V. Barikov, who worked at the experimental plant of Spetsmashtresta Kirov in Leningrad. Getting to work was taken into account the information received from experts of firm Ansaldo, and also the experience gained at designing and manufacturing of heavy tanks T-35, T-42, TG-6 and TP-1. By June 1933, the first six projects were ready, which envisaged the possibility of installing a variety of weapons in two or even towers. The variants with guns 45, 76, 107 and 152-mm were Considered, and as auxiliary armament it was planned to use 4-6 machine-guns DT and 2 fire-throwers. At the next governmental meeting held on June 10, 1933, the projects of heavy tanks TG-6, Ansaldo and T-39 were considered. The Latter aroused the greatest interest, but for various reasons, none of them did not like the military. However, after only a few months, a group of engineers under The direction of S. Ginzburg and N. Barykova have developed two more variants, which have received designations of T-39 7-TH and 8-th project. Both tanks were in many respects similar, except for the scheme of placing of armament- "The eighth " The project provided installation in two main towers of three (!) 107-MM and two 45-mm guns, while "The seventh " was treated by one 152-mm and three 45-mm cannons. The Undercarriage and the reservation were not different. These combat vehicles liked much more, which allowed to bring the work to the construction of layouts in the scale of 1:10, but this had to stop. Having considered the remaining projects of T-39 The governmental Commission has come to disappointing conclusions. In December 1933, the defense Narkom K. Vorashilov reported to the Predstedatelju of the USSR NSC the following: Designing of the super-heavy breakthrough tank named T-39, "Introducing especially successful variants of the big tank, I ask to consider them on the Commission of Defense and definitively to decide-whether we need such fighting machine in return rather powerful, in my opinion , a special purpose tank T-35, which is able to perform most combat tasks. Production of prototype T-39 will require about 3 mln. Rubles and not less than one year ". Thus, the further fate of the T-39 was predetermined. In February 1934, he was removed from the plans of UMM RKKA and Spetmashtresta, deciding to concentrate on the serial tank T-35 A.:
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