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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.

8.8 cm

10.5 cm

12.5 cm

15 cm

21 cm

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.

8.8 cm

10.5 cm

12.5 cm

15 cm

21 cm

In service: 1912

Used on: Older light combatants.

Caliber = 8.8 cm (3.5 inch)

Shell weight = 10 kg (22 lbs)

Muzzle velocity = 792 m/s (2599 fps)

Relative ballistic performance: 0.80

Muzzle energy = 3.140 megajoules = 1156.9 foot-tons

Relative muzzle energy: 0.87

Barrel length: 45 calibers

Elevation Range Time Velocity Fall Angle

2.5 deg 3700 meters 6.4 sec 449 m/s 3.7 deg

5.0 deg 5700 meters 11.6 sec 336 m/s 8.8 deg

7.5 deg 7100 meters 16.2 sec 280 m/s 14.6 deg

10.0 deg 8200 meters 20.5 sec 247 m/s 21.0 deg

12.5 deg 9000 meters 24.4 sec 229 m/s 27.2 deg

15.0 deg 9700 meters 28.1 sec 218 m/s 33.1 deg

20.0 deg 10800 meters 34.9 sec 210 m/s 43.4 deg

25.0 deg 11600 meters 41.3 sec 212 m/s 51.9 deg

30.0 deg 12100 meters 47.2 sec 217 m/s 58.4 deg

35.0 deg 12400 meters 52.9 sec 224 m/s 63.6 deg

40.0 deg 12500 meters 58.2 sec 231 m/s 67.7 deg

45.0 deg 12400 meters 63.2 sec 238 m/s 71.0 deg

50.0 deg 12000 meters 67.9 sec 244 m/s 73.8 deg

Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 16.34 cm

Elevation Range Belt Deck

1.4 deg 2400 meters 10 cm

5.2 deg 5900 meters 5 cm

24.4 deg 11500 meters ... 2 cm

Maximum range = 12500 meters at 39.8 deg elevation

In service: 1912

Used on: Kolkata class CL, G-101 and G-113 class DD

Caliber = 10.5 cm (4.1 inch)

Shell weight = 17 kg (38 lbs)

Muzzle velocity = 783 m/s (2568 fps)

Relative ballistic performance: 0.80

Muzzle energy = 5.333 megajoules = 1965.3 foot-tons

Relative muzzle energy: 0.87

Barrel length: 45 calibers

Elevation Range Time Velocity Fall Angle

2.5 deg 3900 meters 6.4 sec 484 m/s 3.5 deg

5.0 deg 6200 meters 11.8 sec 370 m/s 8.2 deg

7.5 deg 7800 meters 16.7 sec 310 m/s 13.7 deg

10.0 deg 9000 meters 21.1 sec 275 m/s 19.5 deg

12.5 deg 10000 meters 25.3 sec 254 m/s 25.4 deg

15.0 deg 10800 meters 29.2 sec 241 m/s 31.1 deg

20.0 deg 12100 meters 36.5 sec 231 m/s 41.2 deg

25.0 deg 13100 meters 43.3 sec 232 m/s 49.6 deg

30.0 deg 13800 meters 49.7 sec 237 m/s 56.3 deg

35.0 deg 14200 meters 55.7 sec 245 m/s 61.5 deg

40.0 deg 14400 meters 61.4 sec 252 m/s 65.7 deg

45.0 deg 14300 meters 66.7 sec 260 m/s 69.1 deg

50.0 deg 13900 meters 71.7 sec 267 m/s 72.1 deg

Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 19.49 cm

Elevation Range Belt Deck

2.7 deg 4000 meters 10 cm

8.5 deg 8300 meters 5 cm

18.0 deg 11700 meters ... 2 cm

43.3 deg 14400 meters ... 4 cm

Maximum range = 14400 meters at 41.0 deg elevation

In Service: 1918

Used on: Most warships completed in or after 1918

Caliber = 10.5 cm (4.1 inch)

Shell weight = 17 kg (38 lbs)

Muzzle velocity = 783 m/s (2568 fps)

Relative ballistic performance: 0.85

Muzzle energy = 5.333 megajoules = 1965.3 foot-tons

Relative muzzle energy: 0.87

Barrel length: 45 calibers

Elevation Range Time Velocity Fall Angle

2.5 deg 3900 meters 6.4 sec 495 m/s 3.4 deg

5.0 deg 6300 meters 11.9 sec 380 m/s 8.1 deg

7.5 deg 8000 meters 16.9 sec 319 m/s 13.5 deg

10.0 deg 9300 meters 21.4 sec 283 m/s 19.2 deg

12.5 deg 10300 meters 25.6 sec 262 m/s 25.0 deg

15.0 deg 11200 meters 29.6 sec 249 m/s 30.6 deg

20.0 deg 12600 meters 37.1 sec 238 m/s 40.7 deg

25.0 deg 13600 meters 44.0 sec 239 m/s 49.0 deg

30.0 deg 14400 meters 50.5 sec 244 m/s 55.6 deg

35.0 deg 14800 meters 56.6 sec 251 m/s 60.9 deg

40.0 deg 15000 meters 62.4 sec 259 m/s 65.1 deg

45.0 deg 15000 meters 67.9 sec 267 m/s 68.6 deg

50.0 deg 14600 meters 73.1 sec 275 m/s 71.6 deg

Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 19.49 cm

Elevation Range Belt Deck

2.8 deg 4300 meters 10 cm

9.0 deg 8800 meters 5 cm

17.6 deg 12000 meters ... 2 cm

41.2 deg 15000 meters ... 4 cm

Maximum range = 15000 meters at 41.4 deg elevation

In service: 1924

Used on: to be introduced with G-143 class destroyers

Caliber = 12.5 cm (4.9 inch)

Shell weight = 28 kg (62 lbs)

Muzzle velocity = 802 m/s (2630 fps)

Relative ballistic performance: 0.86

Muzzle energy = 8.998 megajoules = 3315.9 foot-tons

Relative muzzle energy: 0.87

Barrel length: 45 calibers

Elevation Range Time Velocity Fall Angle

2.5 deg 4200 meters 6.6 sec 523 m/s 3.3 deg

5.0 deg 6800 meters 12.3 sec 406 m/s 7.8 deg

7.5 deg 8700 meters 17.5 sec 342 m/s 13.1 deg

10.0 deg 10200 meters 22.3 sec 304 m/s 18.7 deg

12.5 deg 11400 meters 26.7 sec 281 m/s 24.3 deg

15.0 deg 12400 meters 30.9 sec 267 m/s 29.7 deg

20.0 deg 14000 meters 38.8 sec 255 m/s 39.7 deg

25.0 deg 15200 meters 46.1 sec 255 m/s 47.9 deg

30.0 deg 16100 meters 53.0 sec 261 m/s 54.5 deg

35.0 deg 16700 meters 59.6 sec 269 m/s 59.9 deg

40.0 deg 17000 meters 65.7 sec 278 m/s 64.0 deg

45.0 deg 17000 meters 71.6 sec 287 m/s 67.6 deg

50.0 deg 16600 meters 77.1 sec 295 m/s 70.7 deg

Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 23.21 cm

Elevation Range Belt Deck

1.7 deg 3200 meters 15 cm

4.3 deg 6200 meters 10 cm

12.8 deg 11500 meters 5 cm

14.2 deg 12100 meters ... 2 cm

30.5 deg 16200 meters ... 4 cm

Maximum range = 17000 meters at 42.3 deg elevation

In service: 1918

Used on: Columbo, Trincomalee class CL; to be on Akbar class BB

Caliber = 15.0 cm (5.9 inch)

Shell weight = 45 kg (99 lbs)

Muzzle velocity = 831 m/s (2727 fps)

Relative ballistic performance: 0.80

Muzzle energy = 15.549 megajoules = 5729.8 foot-tons

Relative muzzle energy: 0.87

Barrel length: 45 calibers

Elevation Range Time Velocity Fall Angle

2.5 deg 4500 meters 6.9 sec 534 m/s 3.4 deg

5.0 deg 7300 meters 12.7 sec 415 m/s 7.9 deg

7.5 deg 9200 meters 18.1 sec 349 m/s 13.3 deg

10.0 deg 10800 meters 22.9 sec 311 m/s 18.8 deg

12.5 deg 12000 meters 27.5 sec 287 m/s 24.5 deg

15.0 deg 13100 meters 31.8 sec 273 m/s 29.9 deg

20.0 deg 14800 meters 39.9 sec 261 m/s 39.8 deg

25.0 deg 16100 meters 47.5 sec 262 m/s 48.1 deg

30.0 deg 17000 meters 54.6 sec 268 m/s 54.6 deg

35.0 deg 17700 meters 61.4 sec 276 m/s 59.9 deg

40.0 deg 18000 meters 67.8 sec 285 m/s 64.1 deg

45.0 deg 18000 meters 73.8 sec 294 m/s 67.6 deg

50.0 deg 17700 meters 79.5 sec 303 m/s 70.6 deg

Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 27.85 cm

Elevation Range Belt Deck

1.2 deg 2500 meters 20 cm

2.7 deg 4700 meters 15 cm

5.7 deg 7900 meters 10 cm

11.5 deg 11600 meters ... 2 cm

15.9 deg 13400 meters 5 cm

24.9 deg 16000 meters ... 4 cm

42.0 deg 18100 meters ... 6 cm

Maximum range = 18100 meters at 42.6 deg elevation

In service: 1918

Used on: Hyderabad class CA

Caliber = 21.0 cm (8.3 inch)

Shell weight = 108 kg (238 lbs)

Muzzle velocity = 889 m/s (2916 fps)

Relative ballistic performance: 0.80

Muzzle energy = 42.666 megajoules = 15722.6 foot-tons

Relative muzzle energy: 0.87

Barrel length: 45 calibers

Elevation Range Time Velocity Fall Angle

2.5 deg 5200 meters 7.4 sec 585 m/s 3.4 deg

5.0 deg 8500 meters 13.7 sec 457 m/s 7.7 deg

7.5 deg 10900 meters 19.5 sec 387 m/s 12.9 deg

10.0 deg 12800 meters 24.8 sec 345 m/s 18.3 deg

12.5 deg 14300 meters 29.8 sec 319 m/s 23.8 deg

15.0 deg 15600 meters 34.6 sec 304 m/s 29.3 deg

20.0 deg 17800 meters 43.5 sec 291 m/s 39.0 deg

25.0 deg 19400 meters 51.8 sec 292 m/s 46.9 deg

30.0 deg 20700 meters 59.7 sec 298 m/s 53.4 deg

35.0 deg 21700 meters 67.2 sec 308 m/s 58.5 deg

40.0 deg 22200 meters 74.4 sec 319 m/s 62.8 deg

45.0 deg 22400 meters 81.2 sec 329 m/s 66.3 deg

50.0 deg 22100 meters 87.6 sec 340 m/s 69.3 deg

Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 38.99 cm

Elevation Range Belt Deck

1.8 deg 4100 meters 25 cm

3.2 deg 6300 meters 20 cm

5.5 deg 9100 meters 15 cm

6.7 deg 10200 meters ... 2 cm

10.5 deg 13100 meters 10 cm

16.8 deg 16500 meters ... 4 cm

26.0 deg 19700 meters ... 6 cm

26.9 deg 20000 meters 5 cm

37.0 deg 21900 meters ... 8 cm

Maximum range = 22400 meters at 44.4 deg elevation

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