As the T-60 light tank proved too weak when faced with German tanks, an improved design was needed. Based on a lengthened T-60 chassis, with the addition of a fifth roadwheel, the T-70 was designed as a better armed, armored, and more agile tank. It had thicker armor, and replaced the 20 mm gun main gun with a 45 mm one. To improve engine power, necessitated by the almost three ton increase in weight, a complex dual-engine design was built. Each track was powered by its own engine, which proved unreliable. The engine layout was later changed to a more conventional one, with the two engines powering both tracks together.
While an improvement over the T-60 design, the T-70 was already obsolete when production started in 1942. Its 45 mm gun was too weak to penetrate the armor of newer German tanks, and it suffered from the two-man crew layout of its predecessor. Production ended the following year, as focus shifted to the more powerful T-34 medium tank. The role as an infantry support tank was taken over by the SU-76 self-propelled gun. The SU-76 used a lengthened version of the T-70 chassis, and was eventually manufactured in greater numbers than the T-70 itself. A total of 8226 were built.
An experimental anti-aircraft tank, the T-90, was designed, armed with a dual 12.7 mm DShK heavy machine gun. A prototype was build, but as the more powerful ZSU-37, based on the SU-76, was designed, the T-90 was cancelled.
|Armour (range)||10-45 mm|
|Speed (max)||45 km/h|
|Primary weapon||45 mm Tank Gun Model 1932/38 (1)|
|Secondary weapon||7.62 mm DT (1)|