Along with U-20 project an alternative tank destroyed prototype based on T-34 chassis was in development. It was named U-20-II.
Some details. Just like U-20, U-20-II used T-34 chassis, had open-top turret for the crew of 3.
Front turret was 75mm, side turret - 40mm, a substantial increase comparing to basic U-20.
Moreover, the new prototype was lower (2475mm, a bit higher than T-34) and the gun stuck out in front of the full for only 200mm, however, the ammo load dropped from 76 to 60 rounds, which was still more than enough.
Another question is what was sacrificed to achieve such compactness.
General blueprint
Longitudinal plan
Central Archive of the Russian Ministry of Defence, fund 81, inventory 12038, case N90
52-K AA gun which was mounted without any sort of modification left next to nothing for the loader. Unsurprisingly, the project was eventually dumped in April 1942. That was the end of T-34 based TDs with 85mm.
Some details. Just like U-20, U-20-II used T-34 chassis, had open-top turret for the crew of 3.
Front turret was 75mm, side turret - 40mm, a substantial increase comparing to basic U-20.
Moreover, the new prototype was lower (2475mm, a bit higher than T-34) and the gun stuck out in front of the full for only 200mm, however, the ammo load dropped from 76 to 60 rounds, which was still more than enough.
Another question is what was sacrificed to achieve such compactness.
General blueprint
Central Archive of the Russian Ministry of Defence, fund 81, inventory 12038, case N90
52-K AA gun which was mounted without any sort of modification left next to nothing for the loader. Unsurprisingly, the project was eventually dumped in April 1942. That was the end of T-34 based TDs with 85mm.
