"December 20th, 1940
#SO6913
#SO6913
To GABTU Regional Engineer,
Military Engineer 2nd Class, comrade Kozyrev
RE: your letter #652s dated November 19th, 1940
A cast turret weighs 2035 kg.
A rolled turret weighs 1885 kg.
The increase in mass of the A-34 from 25,600 kg to 26,700 kg happened for the following reasons:
Reason for weight increase | Introduced due to | Mass (kg) |
Additional fuel tanks | GABTU requirement | 162.8 |
Spare machinegun | GABTU requirement | 14.5 |
Turret bustle ammo rack | GABTU requirement | 99 |
Thicker road wheel disks | Military commission requirement | 20 |
Thicker final drive cover | GABTU requirement | 45 |
Cast iron starter base | Increased robustness | 8.7 |
New starter regulator relay | Improved design | 7.8 |
New cut of front plates | GABTU allowed Mariupol factory to do this | 100 |
Reinforced tow cables | Military commission requirement | 23 |
Thicker turret bustle floor | Military commission requirement | 22 |
Wider turret | Military commission requirement | 80 |
Thicker hull floor | GABTU requirement | 28 |
Cleats and cleat rack | GABTU requirement | 254.6 |
Replacement of the spring shaft covers | 6.4 | |
Thickening of the fuel tanks | Increased robustness | 35.7 |
Replacement of aluminium turning mechanism cases with cast iron ones | Use of surrogates | 13 |
Thicker hull roof | GABTU requirement | 282.3 |
Thicker rear plates | GABTU requirement | 246.3 |
Introduction of an upper hull plate | Mariupol factory requirement | 11.5 |
Antenna port components due to transfer of radio into the hull | GABTU requirement | 8.8 |
Calculated increase in weight compared to weighted prototypes is 1469.4 kg.
Senior factory #183 engineer, Makhonin
Chief of design bureau #520, Kucherenko"