Thursday, 4 April 2019

Gaining Weight

"December 20th, 1940
#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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