Craze in 1920-1930-s top military control thought frisky and profound impact on many breakthrough created at that time swatches military equipment. ABTU Red Army sought by Russian engineers and designers the creation of the machine with the highest high-speed features that can make profound frisky and many kilometers of marches in the enemy's rear. Project cars on the wheel and crawler often favored and given special attention. Work on the creation and rapid maneuvering tanks were carried out at an accelerated pace. In addition to the creation of light tanks on wheeled-tracked, was tasked to do and put the wheels medium tanks, with the more massive armament and reservations capable of without the help of others to do the fighting tasks in deep behind enemy lines. As you know, project TG German engineer E. Grote ended unsuccessfully and made it tank was not accepted for service. But the experience gained in the process of its creation, has been applied to other, more exciting project Russian tank designers — is a project of the TA (tank Asaph), or else its designation T-1001.
Work on the creation of middle-wheeled-tracked tank TA-1 was launched in the middle of 1931 a group of Russian engineers under the direction of V. Asaph. Taking into account the errors in the development of TG, it was decided to make a more ordinary and easy to manufacture chassis. In appearance machine was similar to the German car engineer, outlines hulls, layout layout weapons remained virtually without changes, with the only difference being that the SLT-1, it was bunk. Because of the design features of the suspension of the on-board machine guns had to turn away. But booking TA-1 as compared to TG was relaxed to 13-20 mm, resulting in a substantial decrease of the tank weight, which amounted to 18 tons. Undergone a thorough reworking chassis, it was decided to make the principle of common and reliable way of "Christie tank." Armament consisted of a 76.2-mm gun PS-2, located in the rotating main tower and a 37-mm cannon mounted in a small tower and having a large angle vertical guidance, which was located on top of the main. Three 7.62-mm machine gun "Maxim" in the ball joints were located, one in the frontal armor plate and two in the main tower. Turret had independent rotation relative to each other. As the power plant was elected Aviation 12-cylinder V-engine BMW-IV output of 530 hp, allows a speed more 50 km per hour. Yet project has not been approved, and the design bureau of Asaph were asked to change and modify the chassis of the car, which was made in 1932 to the beginning of the project TA-2, also known as the T-1002.
In contrast, TA-1 Chassis TA-2 consisted of a semi-detached 2-rollers of small diameter and three — large diameter, the motion was carried by means of the rear wheels of the leading pair of rollers, and the first pair to rotate the car. Reservation was increased to 18-30 mm and the weight of the car was more than 27 tons, so that it became difficult to control, it was decided to equip the tank pneumatic controls. Armament remained the same except for the added-board machine guns located in the middle of the hull between the steering wheel and the support roller, which is the relevant feature of the TA-2. The design speed should Strength up to 80 km per hour on wheels and more than 45 km per hour on tracks. But identified in diagrams and technical drawings machine errors have allowed the commission UMM Red Army to take a positive decision on the upcoming project development, and soon it was closed. But this story is not over and soon was offered to the next, the third draft of the series TA-3 or the other of its designated T-3. A new project in almost all different from the previous work, it was a different machine, with larger armor protection, 30-40 mm, and consequently, heavier their predecessors, the total weight of the tank was more than 32 tons. Armament is aligned to the single-tier scheme, and was as follows: one 76.2-mm gun, one 37 mm gun, placed in a rotating turret, and five 7.62-mm machine-guns-29 (two in the tower — coaxial and aft, two on the sides of the body and one in the frontal armor plate). For growth and the ability to place zabronevogo install 2-engines were significantly increased the size of hulls, the length of the machine was more than 8 meters, and the width more 3. As you know, with a ratio of length to width ratio of more than 1:2 maneuverability of the tank drops sharply, the engineers and designers KB Asaph back to square one where we started — to the "Grote tank." In the end, all three had been rejected, and the subsequent work folded TA project remained only on paper.