First months majestically Russian war clearly demonstrated successful concept languid tank with massive arms. KV-1 tanks during this period represented a severe threat to the majority of German armored vehicles and once this had been «too tough» bulk of the German anti-tank weapons. But for some tasks weapons tanks KV-1 in the form of 76-millimeter gun was missing. The available as tanks KV-2 with 152 mm caliber weapon produced in quantities apparently missing. As a result, control tank 2 is collected seven times less than 1 KV. Hardly three tanks with excessive with strong gun could change the situation on the fronts. Small production rates KV-2 did not cover the needs of the Red Army in the so-called assault tanks. Because in November 41th Design Bureau Chelyabinsk Tractor Plant was entrusted to create a new multi-purpose tank capable of beating like armored vehicles and fortified enemy.
For the base of the tank for the «Object 229» were taken to the unique design of the KV-1 and KV-2. From the second version of the «HF» was taken Chassis with 600-horsepower diesel engine, torsion bar suspension and sufficient for tank features languid stroke. It was installed slightly modified turret KV-1. First configuration window for the size to set the gun. In addition, the position was changed some devices inside the tower. And these changes are a consequence of the installation of a new instrument. In accordance with the purpose of assault «Object 229» was changed body armor protection. Thus, the thickness of the frontal plate was increased to large at the time of 135 mm. Another great thickness acquired forehead tower. Assault on the new tank, this parameter was equal 210 millimeters.
As the lead instruments «Object 229» at the very beginning of the design was proposed U-11 cannon. This 122-millimeter howitzer tank created from July 41 th year in the design office of the Ural Machine-Building Plant under control engineers and N. Sidorenko Usenko. The aim was to create a design work of a promising type of weapons with which could significantly improve the combat characteristics of existing tanks KV-1. With all of this breech of the gun was bound to fit into the turret. Requirements in size several complicated work of engineers, but by September-month they managed to eliminate all the hassles and snags. Then the military-political leadership of the country approved the continuation of the U-11 and gave the order to build an experimental batch of these guns. In December, he assembled the first reference.
Until April next year to pilot production plant number 9 was manufactured 10 new howitzers, two of which were sent to other factories for use in trials of new tanks. Delivered to the CTZ specimen was mounted in a modified turret of the KV-1 and the resulting «Object 229» was sent for tests. Separate loading tank gun was sufficiently brought before a test batch production, special problems because the testers did not have. U-11 howitzer was developed on the basis of the M-30 gun and had similar ballistics with him. Because firing of U-11 used the 122 mm ammunition, to create for the M-30. In laying tank «Object 229» fits within 48 shells and liners. The loading was done manually by a single crew member. The suspension system is permitted to point guns it around in a horizontal plane by rotation of the tower and in the range from -4 ° to +19,5 ° in the vertical plane. Instrument was equipped with a telescopic sight TMPD, which allows you to fire at ranges up to 1300 meters.
Begun in the spring of 42 th tests new tank showed correctness of the chosen path. Massive weapons allowed «Object 229» perfectly with all the resources to fight the Germans types of armored vehicles, and in addition U-11 gun was comfortable for long lesions emplacements, bunkers and other fortifications. But during the test more than once appeared prepyadstviya with recoil device. This node U-11 howitzer was designed almost from scratch and had essentially the smallest size compared with other guns recoil device. Testers and engineers Chelyabinsk Tractor Plant, joined forces with designers «Uralmash» still able to cope with the «childhood diseases» howitzers and tank tests have been successfully completed. Commission following the tests «Object 229», recognized the best project and recommended it for adoption by the arms. There was even coined a new index — in accordance with the established tradition of naming languid tanks «Object 229» was renamed KV-9.
According to initial plans, adopted immediately after the issuance of advice Chelyabinsk Tractor had to make a pre-series batch of 10 tanks KV-9. Supposed to be applied all experienced U-11 howitzer. But for various reasons of a different nature was assembled only one pre-series tank. In 1-x, the plant number 9 could not go to the creation of new tools quickly and without sacrificing other products, in-2, began to change the role of the command eyes languid tanks. In the end, full swing creating self-propelled SU-122 and start production of the tank with the same instrument was considered unprofitable. The «Object 229» was closed, and the efforts of the Design Bureau CTZ were redirected to other, more promising direction.
Created by Kirill Ryabov