KV-13 - Russian Heavy Tank, 1941-2
By 1941, the KV-1 was already becoming insufficient for the main heavy tank role in the Red Army, and a new design was ordered as a replacement to address reliability and mobility concerns. Sometime after 1941, the KV-13 was first developed as a prototype and was a completely new design, except for the running gear and suspension, which were from the T-34 and KV-1, respectively. 3 prototypes were made, with 2 mounting the 76mm ZiS-5 gun, and another mounting the 122mm U-11 howitzer. However, following testing in 1943, reliability issues and a scrapping of the overall approach to soviet tank design from the start of the project meant that the design was promptly cancelled. The effort was not in vain, as the IS-1 borrowed heavily from the KV-13, and helped to greatly advance heavy tank design for the USSR.
The brick built model of the obscure yet quaint KV-13 is a great historical example of a transitional period in design. The model has a set of fully articulating tracks and a fully rotating turret with elevating and depressing main gun.