I have a new article, but let me apologize first. I wrongly attributed the ZET-1 to another project. I took the word of some websites who claim the two are connected and I wanted to put something out there on TAP. I was being a bit lazy and my morale was low at the time. No one I can blame except me. Hopefully, I can make it up for it with my T-45 article. The sources were originally in Russian and translated by a friend of mine named Nikita Nikitenko.
Credit: Yuri Pasholok
The T-45 was a Soviet WWII light tank project, meant as a stop-gap measure until the T-70 could enter production. It was based on the lesser T-60, but with a new gun, turret and engine. While the T-45 didn’t have any glaring deficiencies and was superior to the T-60, it was nevertheless inferior to the T-70 in a number of aspects. However, there was no competition between the two, and the order to switch to T-70 production reduced the T-45 to a footnote in AFV history.
The NKTP found that Factory #37, based in Sverdlovsk, Luhansk Oblast, Ukraine, was unable to completely master T-70 production. This was an issue from March 9, 1942 to late August, 1942. Another issue became apparent. Engines became a problem at Factory #37. They lacked GAZ-202 engines for their T-60s. The Gorky Automobile Plant (now known as GAZ) sent less engines than what was needed in the 1st quarter of 1942. This, in turn, delayed T-60 production and sparked the theoretical idea of adding a ZIS-5 and/or ZIS-16 engine to T-60s produced by Factory #37.
Factory #37’s design bureau, headed by N.A. Popov, was tasked with designing the new vehicle. The design bureau was mostly made up of engineers who worked for Department #22 until their evacuation to Sverdlovsk. Department #22 worked on many tank projects and N.A. Popov, who also evacuated to Sverdlovsk, was the senior designer of the T-40 amphibious light tank.
The ZIS-16 (which came from a bus of the same name) was chosen as the new engine. The ZIS-16 engine received a new designation as the ZIS-60 for the tank version. This modified T-60 had an engine compartment that was easier to access, was less noisy, and had a top speed of 40.5 km/h which is one 1 km/h gained from the T-60 with the GAZ-202 engine installed. However, the engine had cooling problems. It also had modified final drives and a redesigned exhaust system. 5 of these new T-60s were ordered.
Factory #37’s military engineer 1st class, S.A.A. Afonin, mentioned this to the NKTP (People’s Commissariat of Tank Industry) during a meeting on May 14, 1942. He also conveyed the idea of adding a 45mm gun and increasing the armor to 35mm which started the idea of the T-45. To Factory #37’s disappointment, these modifications and proposals were seen negatively by the NKTP. With this combination, this T-60 variant was still inferior to the T-70 in terms of armor, engine power, and mobility. Since this would increase the weight of the vehicle, the engine, transmission, and suspension would suffer from further stress. The NKTP would not recommend this T-60 variant.
By the end of the meeting, Factory #37 was told to perform a trial of 200 km. After this task was completed, the results were to be sent to the Main Directorate of Armored Forces (GABTU) for evaluation. In the meantime, no more prototypes were allowed to be constructed.
It seems like Factory #37 started from scratch during or shortly after the meeting. This time they would actually install the 45mm gun, a new turret, and increase the armor thickness of the hull. This became known as the T-45.
S.A. Ginzburg, lead designer of the T-50 light tank and deputy director of the NKTP, joined the factory’s design team around April, 1942. Ginzburg sought to produce a light SPG based on the T-60 chassis, which matched the Factory #37’s goal. However, the T-45 was mostly complete by then.
Motivation behind the T-45
Upon the T-70s entry into mass-production, the Gorky Automobile Plant would have to produce twice as many engines GAZ-202 engines, as the new light tank used two of them. However, the factory was already having problems supplying them, and this in turn caused delay to the delivery of the tanks to the Red Army
This meant that they could produce tanks that were superior to the regular T-60 while not sacrificing too much of the production. The T-45 offered superior weaponry, armor, and it would have used an engine that was easier to obtain, as the factory which produced it was closer.
Compared to the T-60, the T-45’s hull armor was mostly the same with the exception of the sloping of the upper front glacis, that had 25mm of armor instead of 15mm. If it was ever needed, the flat front glacis could be up-armored from 35mm to 45mm. The increase of armor makes the protection almost on par with the T-70. The armor thickness of the side of the T-45’s turret was 35mm. The driver’s hatch now swiveled to the side like the Panther’s cupola. The T-45 was also riveted opposed to being welded (it is highly likely this would have changed should it have reached production).
The T-45 was armed with a 45mm 20K Model 1938 and a coaxial DT machine gun. This setup was very common among Soviet light tanks, as well as on the T-70.
The first trials were held on May 20th, 1942. The firepower was tested. The T-45 achieved 7-8 shells per minute when standing still and 3 shells per minute when on the move. The turret tended to sink inside the hull due to its weight. Despite the sinking turret, it managed to hit all 25 of its shells at the target.
The TMPF sight was planned to be replaced with the standard TOP 45mm sight.
The T-45 received the inferior, but common ZIS-5 engine (the engine already traveled 12,000 km) which was ripped from a truck. The ZIS-16 engine was in short supply as they only had one left. Unfortunately, the top speed decreased to 37.2 km/h. It also received final drives and steering clutches from the T-70. New, strengthened torsion bars were added to alleviate the added weight (7 tonnes).
Driving trials were performed for seven days from the 6th to the 13th of June. In total, it traveled 1505 km; 189 km on asphalt roads, 805 km on gravel, 410 km on rubble, and 110 km on dirt roads. The trials revealed several defects such as the cooling fans malfunctioning twice, the engine working at high RPMs (which increases the chances of it breaking down), tires occasionally slipping off the wheel, and the track links breaking several times. The quality of the track links reflected on Factory #183, which manufactured them, and not Factory #37. The trials were successful with the exception of a few complaints that were listed earlier, especially with an old ZIS-5 engine that already had 12,000 km on it.
Upon successful termination of the trials and if the GABTU gave it’s blessing, the Miass factory, based in Miass, Chelyabinsk Oblast, Russia, would’ve produced the T-45’s ZIS-5 engine along with the transmission. The ZIS-16 engine would probably replaced the ZIS-5 once it’s production would have been properly set-up. However, since the T-45 was never placed into service, production of the engine and the transmission never occurred.
The data of the trial was sent to GABTU by the end of June, 1942. This data included both the T-45 and the T-60 with the ZIS-16 engine.
Factory #37 already struggled at producing T-60s. 321 semi-completed T-60s were produced, but only 109 were fully complete in June. The rest lacked tracks and armaments. The goal at the factory was supposed to be 200 complete T-60s.
Central Command’s new rule named #1958ss “Regarding T-34 and T-70 Tank Production” forced Factory #37 to cancel all T-60 production and to switch to the T-70. Prior to this, Factory #37 only built 10 T-60s in July. After they switched, scarcity of parts became more and more obvious. This sealed the fate of the T-45 project.
The T-45 didn’t suffer from any condemning defects and some of the characteristics were largely on part with the T-70.
Whatever small advantages the T-45 could bring to the table could not convince the Soviet command to add yet another light tank into service. This would have complicated both maintenance and production in a moment when the Soviets needed as many tanks as possible as fast as possible.
Ultimately, the T-45 was born and quietly faded in the shadow of the T-70, without having a chance of proving itself.
The remaining prototype was sent into battle where it was most likely destroyed
“T-60 and Related Vehicles” by Yuri Pasholok (Т-60 и машины на его базе. Юрий Пашолок)
Yuri Pasholok’s post on warspot.ru (pictures of T-45 came from this site)
Special thanks to Yuri Pasholok (schematic and some info came from Yuri himself)