"Calculations of hull and turret weights made to requirements of the GBTU TU
Report on the increase in mass of the T-64 tank as a result of increase of armour thickness
- Armour thickness:
- Front plate: 45 mm at 80 degrees
- Lower front plate: 220 mm at 0 degrees (cast)
- Side armour: 150 mm at 0 degrees
- Rear: 75 mm at 10 degrees
- Turret front: equivalent to 220 mm at 0 degrees
- Turret side: equivalent to 220 mm at 0 degrees
- Turret rear: equivalent to 150 mm at 0 degrees
- Increasing the thickness of the turret armour by 80 mm (the turret shape is taken as a truncated cone for ease of calculations):
- Side surfaces: (720+380)/2 * 70 = 38,500 cm²
- Dimensions of the added plate: 38,500 * 8 = 308,000 cm³
- Increase in mass: 308,000 * 8 = 2,464,000 grams or 2,464 kg
- Increasing the thickness of the front armour by 15 mm:
- 142 * 220 = 31,240 cm²
- 31,240 * 1.5 = 46,860 cm³
- 46,860 * 8 = 375,000 grams or 375 kg
- Increasing the thickness of the hull armour by 25 mm
- 220 * 110 = 24,200 cm²
- 24,200 * 2.5 = 60,500 cm³
- 60,500 * 8 = 484,000 grams or 480 kg
Total increase in mass is equal to 3,300 kg.
Assistant to the Chief of the 2nd Department of the GBTU TU, Engineer-Captain [signature]"