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"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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