T-35 is a heavy tank of the 1930s made in the USSR. It is the only five-turret tank of mass production. In the period since 1933 to 1939 61 units were produced. It had not participated in battles till 1941 however was used for military parades being the symbol of the Soviet power. T-35 took part in early battles of WWII however it was lost too soon because of multiple occuring failures.
They started to develop the tank in the end of the 20s. But Soviet engineers didn't have enough experience in this sphere so they invited the German specialists who came to the USSR in 1930 and helped to design the tank.
The first tank, T-35-1, was made in August, 1932. Its weight was 42 tons, its armour was 30-40 mm thick. The tank was equipped with one 76 mm gun, two 37 mm guns and three more guns. The crew consisted of 10-11 persons. The dimensions of the tank were 9720 x 3200 x 3430 mm. The travel speed of the tank was 28 km/h. The top of the main turret had a rounded shape.
T-35-1 showed good results during the first trials in 1932 however some disadvantages were also noticed in the power package. Besides, the construction of the pneumatic control and transmission was too complicated and expensive for mass production. The designers were offered to refine the project.
T-35-2 was assembled in April, 1933 and in May it already participated in a military parade in Leningrad.
As opposed to the first model of T-35 the new one had a diffrent main turret, another engine, cover skirt and had some other small changes.
At the same time there was being designed a T-35A, which was much different from T-35-1(2). Its chassis was lengthened with one more truck, small machine gun turrets had a different design, average turrets of the enlarged shape were equipped with a 45-millimeter cannons 20K.Tthey also changed the form of the body, and made some other differences. In fact, it was a completely new machine.
During the production period the design of the tank was modified many times. They were changing armour thickness, engine power, weight of the tank, number of crew members etc.