#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"
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