16646s

The 16646s is a series of Soviet-designed and produced main battle tanks, developed in the late 1950s and early 1960s. The designation "16646s" refers to the tank's GRAU (Group of Armament and Artillery) index number, which is a Soviet military classification system. The tank was designed to replace the T-54 and T-55 tanks, which were in service during the same period. The 16646s was intended to be a more advanced and capable tank, with improved armor, firepower, and mobility.

The 16646s was equipped with a 125mm smoothbore gun, which was a significant upgrade from the 100mm guns used on the T-54 and T-55. The tank also featured a new automatic loader, which allowed for faster reloading and increased firepower. The 16646s had a crew of four and was powered by a V-55 diesel engine, which provided a top speed of around 50 kilometers per hour.

The 16646s was first introduced in 1961 and saw limited service in the Soviet Army. However, it was quickly replaced by the T-62, which was considered to be a more advanced and capable tank. The 16646s was not exported and remained in service with the Soviet Army until the late 1960s, when it was gradually phased out. Despite its limited service, the 16646s is an important part of Soviet military history, as it represents an early attempt to develop a new generation of main battle tanks.