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KV-9 Object 229

KV-9 Heavy tank was created at the beginning of 1942. It was suitable for destruction of defensive points and fight against tanks of the enemy. KV-9 tank were armed with a 122-mm short-barrel howitzer and had thick armor (up to 135 mm). Therefore KV-9 tank surpassed all previous models of KV tank's family on fire power and thickness of armor. It was recommended, but didn't go to production.

During the war, attempts were made to strengthen weapons by installing a 122-mm howitzer U-11 in the new turret. This variant, which received the designation KV-9, was tested in March 1942 and was recommended for serial production as a fire support tank (essentially ACS). A more radical option was to install three cannons (two 45-mm 20K and one 76.2-mm F-34) in a fixed wheelhouse. A heavy KV-7 tank with similar weapons was tested at the end of 1941, after which the weapons were reduced to two F-34 guns. As expected, such an upgrade did not find support and remained at an experimental level.

In the first months of the war Russian majestically demonstrated the successful concept of slow tanks with massive weaponry. KV-1 tanks during this period represented a severe threat to the majority of German armored vehicles and they were "too tough" for the bulk of the German anti-tank weapons. But for some tasks the 76-mm guns on the KV-1 tanks were inadequte. The available as tanks KV-2 with a 152 mm caliber gun was apparently missing performance qualities, and as a result the KV-2 is was produced in seven times less quantity than the KV-1. The low rate of output of the KV-2 did not cover the needs of the Red Army for the so-called assault tanks. Because of this, the design office Chelyabinsk Tractor Plant waas been entrusted to a new multi-purpose tank, able to beat both the armor and fortified enemy.

For the base of the tank "Object 229" were taken the unique designd of the KV-1 and KV-2. From the second version of the "KV" was derived chassis with a 600-horsepower diesel engine, torsion bar suspension and sufficient for the tank features languid stroke. It was set a slighly modified turret KV-1. First configuration for the size window to set the gun. In addition, the situation has changed some devices inside the turret. And these changes are a consequence of the installation of a new gun. In accordance with the purpose of assault "Object 229" had changed body armor protection. Thus, the thickness of the front plate was increased to tremendous for those times 135 mm. The turret also acquired another huge thick brow. The armor on the new tank in this option equalled to 210 millimeters.

As the lead armament of "Object 229" at the very beginning of the design was proposed gun U-11. This 122-mm tank howitzer created at the design bureau of the Ural Machine-Building Plant under supervision of N.Usenko. The aim of the design was to create a work of a promising type of weapons with which one could significantly improve the properties of existing military tanks KV-1. With all of this, the breech of the gun was bound to fit in the turret. Requirements in size somewhat complicated the work of engineers, but by September, they were able to eliminate all the difficulties and hiccups. At the same time the military-political leadership of the country approved a continuation of the U-11 and gave the order to build a test batch of these guns. In December, they assembled the first prototype.

Prior to April 1942 the experimental production plant number 9 manufactured 10 new howitzers, two of which were sent to other factories for use in the testing of new tanks. Those delivered to CTZ wereinstalled in the turret modifed KV-1 and the resulting "Object 229" was sent for tests. Tank tooling had been sufficiently brought before the test batch production, so the testers did not have special problems. The U-11 howitzer was developed on the basis of the M-30 gun and had similar ballistics. The firing of the U-11 used 122-mm ammunition, which were created for the M-30. In laying the tank "Object 229" fit within it 48 shells. The loading was done manually by individual crew members. The suspension system helped to aim the gun in a circle in the horizontal plane by the rotation of the turret and in the range from -4 to +19.5 in the vertical plane. The gun was equipped with a telescopic sight TMPD, which allowed firing at ranges of up to 1,300 meters.

Begun in the spring of 1942, the tests of the new tank proved the correctness of the chosen path. The massive weapon on allowed "Object 229" to destroy all the available at Germans types of armored vehicles, and in addition the U-11 gun was useful for the destruction of long gun emplacements, bunkers and other fortifications. But in the process of testing more than once there appeared a problem with recoil device. This node of the U-11 howitzer was designed almost from scratch and had a significantly smallest size compared with other guns recoil device. The testers and engineers Chelyabinsk Tractor Plant, joined forces with the designers at Uralmash to cope with the "childhood diseases" of howitzers, and the tank tests were successfully completed. The Commission to monitor the tests "Object 229" recognized the project sa successful 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 the approval, Chelyabinsk Tractor had to make a pre-series batch of 10 tanks KV-9. It was supposed to be applied to all experienced U-11 howitzer. But for a number of circumstances of different nature these were collected only one pre-series tank. The plant could not go to the creation of new tools quickly and without sacrificing other products, and began to change the role of such. In the end, going full speed the creation of self-propelled gun SU-122 and the start of production of the tank with the same weapon was considered unprofitable. The "Object 229" was closed, and the efforts of the design office CTZ were redirected to other, more promising directions.

Various sources claim that two prototypes of the heavy tank KV-9 were built. A number of sources state that only one working prototype was produced. However, it is reliably known that by the beginning of the summer of 1942 the project for the development and production of a heavy KV-9 tank had been frozen, the efforts of the KB and plant employees were directed to other promising areas, and the prototype produced or (two prototypes) in combat conditions of participation never accepted. There is information that they were dismantled at the end of 1943 for metal.

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Page last modified: 09-03-2019 17:59:46 ZULU