Tuesday 24 June 2014

Mass Breakdown


Columns: KV-1 with 75 mm armour, KV-3 with 90 mm armour, KV-3 with 120 mm armour, KV-1S. KV-3 with 90 mm of armour is obviously the T-150.

Rows: 
Hull
Left side
Right side
Upper front plate
Lower front plate
Upper rear plate
Lower rear plate
Front bottom plate (40 mm)
Rear bottom plate (30 mm)
Front roof
Engine compartment roof
Internal walls
Hull mass
Turret
Upper rear plate
Lower rear plate
Right side
Left side
Front plate
Frame cover
Roof
Turret holders
Turret weight
Total hull and turret weight

"Mass of the KV-1 tank: 46,000 kg
Mass of the KV-3 with 90 mm of armour: 50,200 kg
Subtracting the mass of the hull, we get:
Internals of the KV-1: 22,540 kg
Internals of the KV-3: 24,300 kg

Taking the weight of the internals of the KV-3 with 120 mm of armour as the same 24,300 kg, and counting that the ZiS-5 is 300 kg heavier, the KV-3 (120 mm) works out to be 52,801 kg.

I deem the construction of a tank with 120 mm of front armour and a 76 mm ZiS-5 gun that weighs no more than 54-55 tons viable."

CAMD RF 38-11355-107

The ZiS-5 isn't the gun that went on the KV-1 and KV-1S, but an older index, referring to a 76 mm tank gun with ballistics of the 3-K model 1931 AA gun.

Another table, comparing the masses of only turrets, but for many more vehicles. The data is approximate, due to manufacturing tolerances individual turrets could end up heavier or lighter.

Vehicle
Turret weight (kg)
With turret ring
Without turret ring
Domestic
KV-1S
5300
5670
T-34 (76 mm)
2700
2890
BT-7
600
645
T-26
750
805
T-80
1250
1340
T-70
1000
1070
T-60
550
590
BA-10
450
485
BA-20
150
165
BA-64
110
120
Captured
Tiger
6000
6450
Panther
4700
5050
PzIV
3000
3220
PzIII
2000
2140
PzII Ausf. B
650
700
SdKfz 221
200
215
SdKfz 222
350
375
Allies
M3 Light
900
965
Churchill
3600
3850
Valentine
1400
1500
Matilda
3100
3320
M3 Medium
1900
2035
M4A2
3500
3750
M4A4
3500
3750

Sadly, these notes do not appear to mention what modification. Another document is provided stating the weight of the Matilda turret to be 3812 kg with the turret ring and 3567 without, with the same figured for the Valentine being 2415 kg and 2210 kg, significantly higher than the ones in the table. However, the latter figures count the gun mantlet, while the former ones presumably do not.

1 comment:

  1. I think you mixed up the turret weights a bit. The turrets all seem to weigh more withOUT the turret ring. Seems suspicious to me.

    ReplyDelete