DesignĪs mentioned earlier, many elements from the IS-6 program were used in Object 257. This project would get the designation Object 257 and was the first design to get the name IS-7. The biggest change was made to the lower hull and suspension. The engine and transmission, rather interestingly, were taken from the Object 253, the IS-6 variant which used a mechanical-electrical transmission, which caught fire during trials, was expensive and unreliable. The turret was taken directly from the Object 252U, and so was the pike-nose design. Isakov, who had previously worked on the Object 252U and IS-2U projects, as chief designer. Work started on the new heavy tank in May 1945 with P. The shells were however larger, as the gun had a 130 mm caliber. Nonetheless, the idea was never fully dropped, as the final IS-7 prototype used a loading assistant, using a conveyor belt. It also decreased the rate of fire to 7-8 rounds per minute at a higher price tag. Even a mechanical autoloader was tested, but, despite its claimed solid reliability, it was sluggish and was not worth losing a crew member on. This new gun was called BL-13-1 and featured improvements over the BL-13, such as a mechanical gun rammer, increasing its rate of fire to a whopping 8-10 rpm. Earlier prototypes of the IS-6 had the D-30. Factory No.100 had already done work with OKB-172 on the BL-13 gun which was used on the late alterations of the Object 252 and 252U. On 7th April 1945, requirements for a 122 mm tank gun with a muzzle velocity of 1,000 m/s (3,280 fps), two-part ammunition, and a rate of fire of four rounds per minute (15 seconds reload) were issued. Illustration of Object 252U, on which Object 257 was largely based. Despite its failure, it served as a good basis for the upcoming heavy tank. However, the changes were not able to revive the already canceled IS-6.
#OBJECT 260 MEN OF WAR 2 UPGRADE#
An upgrade to the Object 252, known as the Object 252U, was made in November of 1944, using pike-shaped angled armor with help of engineers from NII-48 research institute. Factory No.100 had just lost to SKB-2, as the Object 252 and 253 (IS-6) were deemed inferior in many ways to the Object 701. This left a window of opportunity for Factory No.100 to take over and begin work on the IS-4 replacement. The SKB-2 factory, which designed the Object 701, was too busy with it and was working on its production. In February of 1945, a replacement program for the Object 701 (IS-4), which had just started development seven months earlier, was requested by the GABTU (Main Directorate of Armored Forces). One of these was the Object 257, the bridging in between the failed IS-6 and the renowned IS-7. However, few know about its lengthy and intricate development process, consisting of many years of work and prototypes, with a total of seven different prototypes sharing the name IS-7.
.jpg "object 260 men of war 2")
The IS-7 (Object 260) is one of the most well-known tanks developed by the USSR, in part due to its massive size and weight, placing it with the likes of Tiger II.
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