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IS-3 Prototype Penetration Testing

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"Resilience of main hull components

Part

Thickness (mm)

Plate Angle (deg)

Shell type

Angle

Impact velocity

Range (m)

Damage type

Caliber

Type

Upper front plate

120

60

88

AP

0

965

350

No penetration

Upper front plate

120

60

122

AP

0

758

690

No penetration

Side with spaced armour

85/16

60/35

88

AP

90

982

150

No penetration

Side without spaced armour

85

60

88

AP

90

983

159

Limit of dangerous penetration

Side with spaced armour

85/16

60/35

75

Subcaliber

60

1051

100

No penetration

Side (upper belt)

100

0

75

AP

45

905

500

No penetration

Side (upper belt)

100

0

75

AP

60

720

1600

Penetration

Side (rear part)

60

0

75

AP

35

780

1500

Limit of rear plate

Bottom with spaced armour

20/30

60

75

AP

35

607

2200

Only spaced armour is penetrated

Bottom with spaced armour

20/30

60

75

AP

35

660

1900

Same


Resilience of main turret components

Part

Thickness (mm)

Angle of plate

Shell type

Impact velocity (m/s)

Range (m)

Damage type

Caliber

Type

Turret front

175

Sphere

88

AP

967

350

Penetration less than shell caliber

2nd belt

120

51

88

AP

900

1000

Penetration within +/- 15 degrees of normal

3rd belt

90-100

58

88

AP

900

1000

4th belt

175

15

88

AP

900

1000

2nd belt

120

51

88

AP

965

350

Penetration within +/- 30 degrees of normal

3rd belt

90-100

58

88

AP

966

350

4th belt

175

15

88

AP

975

300


Figure #35: Diagram of the damage to the turret.

Recommendations on improvement of the IS-3 tank design

Hull and turret

1. Replace the sides of the hull with a single bent 75 mm thick plate of medium hardness with a 45 mm high hardness screen in the middle part, according to the attached diagram.

Figure #9: Diagram of the hull side armour.

2. Thicken the front part of the hull roof, not protected by the turret, to 45-60 mm.
3. Increase the thickness of the front of the turret to 230 mm.
4. Remove the sudden change from the fourth belt (175 mm) to the third belt (90 mm) by changing the slope of the fourth belt according to the attached diagram.

Figure #10. Diagram of the changes to the turret armour.

RGASPI 644-2-464

It's worth noting that the designers took the results of these trials seriously and upgraded the turret armour significantly,

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