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[SIZE=3]Note: [/SIZE]

As "BigGun" lists WW1 shell factors as 0.6 to 0.8, and WW2 shell factors as ~1.0, all Indian shell form factors start with 0.8 as their baseline in 1918, and increase by 0.01 for each year after in 1918 in which the gun is introduced.

Therefore, the 10.5cm/1918 has a shell-form factor of 0.80, while the 12.5cm/1924 has a shell-form factor of 0.86.

Obviously this puts India at a disadvantage when faced with Wesworld 1920's vintage artillery using superheavy shells and shell-form factors in excess of 1.0; but from a historic perspective, it seems realistic.

9.8"

10.2"

11"

12"

13.8"

As "BigGun" lists WW1 shell factors as 0.6 to 0.8, and WW2 shell factors as ~1.0, all Indian shell form factors start with 0.8 as their baseline in 1918, and increase by 0.01 for each year after in 1918 in which the gun is introduced.

Therefore, the 10.5cm/1918 has a shell-form factor of 0.80, while the 12.5cm/1924 has a shell-form factor of 0.86.

Obviously this puts India at a disadvantage when faced with Wesworld 1920's vintage artillery using superheavy shells and shell-form factors in excess of 1.0; but from a historic perspective, it seems realistic.

9.8"

10.2"

11"

12"

13.8"

In Service: 1920

Used On: MT Chandragupta

Caliber = 25.0 cm (9.8 inch)

Shell weight = 220 kg (485 lbs)

Muzzle velocity = 809 m/s (2653 fps)

Relative ballistic performance: 0.82

Muzzle energy = 71.986 megajoules = 26526.9 foot-tons

Relative muzzle energy: 0.87

Barrel length: 45 calibers

Elevation Range Time Velocity Fall Angle

2.5 deg 4900 meters 6.9 sec 623 m/s 3.0 deg

5.0 deg 8400 meters 13.2 sec 518 m/s 6.7 deg

7.5 deg 11200 meters 19.1 sec 452 m/s 11.1 deg

10.0 deg 13500 meters 24.6 sec 409 m/s 15.6 deg

12.5 deg 15400 meters 29.8 sec 381 m/s 20.3 deg

15.0 deg 17100 meters 34.8 sec 362 m/s 25.0 deg

20.0 deg 19900 meters 44.3 sec 344 m/s 33.8 deg

25.0 deg 22100 meters 53.2 sec 341 m/s 41.5 deg

30.0 deg 23900 meters 61.6 sec 346 m/s 48.0 deg

35.0 deg 25200 meters 69.7 sec 355 m/s 53.4 deg

40.0 deg 26000 meters 77.3 sec 367 m/s 57.9 deg

45.0 deg 26300 meters 84.5 sec 379 m/s 61.7 deg

50.0 deg 26000 meters 91.3 sec 391 m/s 65.2 deg

Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 46.42 cm

Elevation Range Belt Deck

1.9 deg 3900 meters 35 cm

3.2 deg 6000 meters 30 cm

4.8 deg 8200 meters ... 2 cm

5.1 deg 8600 meters 25 cm

8.1 deg 11800 meters 20 cm

10.4 deg 13800 meters ... 4 cm

13.3 deg 16000 meters 15 cm

17.8 deg 18700 meters ... 6 cm

23.6 deg 21500 meters ... 8 cm

24.9 deg 22100 meters 10 cm

29.8 deg 23800 meters ... 10 cm

36.6 deg 25500 meters ... 12 cm

44.0 deg 26300 meters ... 14 cm

Maximum range = 26300 meters at 45.3 deg elevation

In service: 1894

Used on: PD Ashoka

Caliber = 28.0 cm (11.0 inch)

Shell weight = 240 kg (529 lbs)

Muzzle velocity = 849 m/s (2784 fps)

Relative ballistic performance: 0.70

Muzzle energy = 86.440 megajoules = 31853.3 foot-tons

Relative muzzle energy: 0.74

Barrel length: 40 calibers

Elevation Range Time Velocity Fall Angle

2.5 deg 5000 meters 7.1 sec 591 m/s 3.2 deg

5.0 deg 8300 meters 13.4 sec 470 m/s 7.4 deg

7.5 deg 10700 meters 19.1 sec 401 m/s 12.3 deg

10.0 deg 12600 meters 24.4 sec 359 m/s 17.4 deg

12.5 deg 14300 meters 29.4 sec 333 m/s 22.7 deg

15.0 deg 15600 meters 34.2 sec 316 m/s 27.9 deg

20.0 deg 17900 meters 43.1 sec 302 m/s 37.3 deg

25.0 deg 19700 meters 51.5 sec 301 m/s 45.3 deg

30.0 deg 21000 meters 59.4 sec 307 m/s 51.8 deg

35.0 deg 22000 meters 67.0 sec 317 m/s 57.1 deg

40.0 deg 22600 meters 74.2 sec 328 m/s 61.4 deg

45.0 deg 22800 meters 81.0 sec 338 m/s 65.0 deg

50.0 deg 22500 meters 87.3 sec 349 m/s 68.1 deg

Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 46.82 cm

Elevation Range Belt Deck

1.3 deg 3000 meters 35 cm

2.3 deg 4600 meters 30 cm

3.5 deg 6400 meters 25 cm

5.2 deg 8500 meters ... 2 cm

5.5 deg 8800 meters 20 cm

9.0 deg 11900 meters 15 cm

13.2 deg 14700 meters ... 4 cm

16.5 deg 16400 meters 10 cm

19.9 deg 17800 meters ... 6 cm

27.1 deg 20300 meters ... 8 cm

35.2 deg 22000 meters ... 10 cm

39.5 deg 22600 meters 5 cm

44.8 deg 22800 meters ... 12 cm

Maximum range = 22800 meters at 44.5 deg elevation

In service: 1924

Used on: Coastal artillery;

Caliber = 35.0 cm (13.8 inch)

Shell weight = 600 kg (1322 lbs)

Muzzle velocity = 811 m/s (2662 fps)

Relative ballistic performance: 0.86

Muzzle energy = 197.5 megajoules = 72789.8 foot-tons

Relative muzzle energy: 0.87

Barrel length: 45 calibers

Elevation Range Time Velocity Fall Angle

2.5 deg 5100 meters 7.0 sec 671 m/s 2.8 deg

5.0 deg 9200 meters 13.6 sec 580 m/s 6.3 deg

7.5 deg 12600 meters 19.8 sec 519 m/s 10.1 deg

10.0 deg 15400 meters 25.7 sec 476 m/s 14.2 deg

12.5 deg 17900 meters 31.4 sec 447 m/s 18.5 deg

15.0 deg 20000 meters 36.8 sec 427 m/s 22.7 deg

20.0 deg 23700 meters 47.2 sec 406 m/s 30.8 deg

25.0 deg 26700 meters 57.0 sec 401 m/s 38.1 deg

30.0 deg 29200 meters 66.3 sec 406 m/s 44.3 deg

35.0 deg 31000 meters 75.2 sec 416 m/s 49.6 deg

40.0 deg 32300 meters 83.6 sec 428 m/s 54.2 deg

45.0 deg 32800 meters 91.6 sec 442 m/s 58.2 deg

50.0 deg 32600 meters 99.1 sec 455 m/s 61.9 deg

Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 64.98 cm

Elevation Range Belt Deck

1.6 deg 3400 meters 55 cm

2.6 deg 5300 meters 50 cm

3.4 deg 6700 meters ... 2 cm

3.8 deg 7400 meters 45 cm

5.4 deg 9800 meters 40 cm

6.4 deg 11200 meters ... 4 cm

7.5 deg 12600 meters 35 cm

9.9 deg 15300 meters ... 6 cm

10.5 deg 15900 meters 30 cm

14.8 deg 19800 meters 25 cm

15.1 deg 20100 meters ... 8 cm

19.0 deg 23100 meters ... 10 cm

21.9 deg 24900 meters 20 cm

22.7 deg 25400 meters ... 12 cm

26.3 deg 27400 meters ... 14 cm

30.1 deg 29200 meters ... 16 cm

34.0 deg 30700 meters ... 18 cm

34.8 deg 31000 meters 15 cm

38.1 deg 31900 meters ... 20 cm

42.3 deg 32600 meters ... 22 cm

46.8 deg 32900 meters ... 24 cm

Maximum range = 32900 meters at 46.3 deg elevation

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