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[41cm/50 cal Model 1918]
['38cm'/54 cal Model 1923]
36cm/45 cal Model 1918
36cm/45 cal Model 1911
28cm/50 cal Model 1924

These guns were created for the original Kii class battleships and the Shizuoka class battleships. After the signing of the Cleito Treaty, two of these guns were put on display at the Imperial Palace, two at Edo Castle, four were converted and used for tests and the remainder were assigned as coastal artillery at various locations.

410mm Model 1918

Caliber = 16.1 inch (41.0 cm)
Shell weight = 2100 lbs (953 kg)
Muzzle velocity = 2872 fps (876 m/s)

Relative ballistic performance: 0.92

Muzzle energy = 365.3 megajoules = 134608.6 foot-tons

Relative muzzle energy: 1.00

Barrel length: 50 calibers


Elevation Range Time Velocity Fall Angle

2.5 deg 6600 yards 7.6 sec 2399 fps 2.8 deg
5.0 deg 11900 yards 14.7 sec 2090 fps 6.2 deg
7.5 deg 16300 yards 21.5 sec 1876 fps 10.0 deg
10.0 deg 20000 yards 27.9 sec 1729 fps 14.0 deg
12.5 deg 23300 yards 34.1 sec 1627 fps 18.1 deg
15.0 deg 26200 yards 40.0 sec 1558 fps 22.2 deg
20.0 deg 31300 yards 51.4 sec 1487 fps 30.0 deg
25.0 deg 35500 yards 62.3 sec 1474 fps 37.1 deg
30.0 deg 39000 yards 72.6 sec 1495 fps 43.1 deg
35.0 deg 41700 yards 82.5 sec 1535 fps 48.3 deg
40.0 deg 43700 yards 91.9 sec 1584 fps 52.7 deg
45.0 deg 44700 yards 100.9 sec 1637 fps 56.7 deg
50.0 deg 44600 yards 109.2 sec 1688 fps 60.3 deg


Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 32.91 inches


Elevation Range Belt Deck

1.6 deg 4400 yards 28 in
2.4 deg 6400 yards 26 in
3.3 deg 8500 yards ... 1 in
3.4 deg 8700 yards 24 in
4.6 deg 11100 yards 22 in
6.0 deg 13700 yards 20 in
6.3 deg 14200 yards ... 2 in
7.8 deg 16800 yards 18 in
9.6 deg 19500 yards ... 3 in
10.1 deg 20200 yards 16 in
13.3 deg 24200 yards 14 in
14.2 deg 25300 yards ... 4 in
17.8 deg 29200 yards 12 in
18.6 deg 29900 yards ... 5 in
21.9 deg 33000 yards ... 6 in
25.1 deg 35500 yards 10 in
25.4 deg 35800 yards ... 7 in
29.0 deg 38300 yards ... 8 in
32.6 deg 40500 yards ... 9 in
36.3 deg 42300 yards ... 10 in
37.2 deg 42700 yards 8 in
40.2 deg 43700 yards ... 11 in
44.2 deg 44600 yards ... 12 in
48.2 deg 44800 yards ... 13 in


Maximum range = 44800 yards at 47.2 deg elevation

The 38 cm Model 1923 are actually 41 cm guns with liners that restrict the bore to 38 cm. They are mounted on the latest class of Japanese Battleships.

380mm Model 1923

Caliber = 15.0 inch (38.0 cm)
Shell weight = 1800 lbs (817 kg)
Muzzle velocity = 2914 fps (888 m/s)

Relative ballistic performance: 0.95

Muzzle energy = 322.3 megajoules = 118771.1 foot-tons

Relative muzzle energy: 1.11

Barrel length: 54 calibers


Elevation Range Time Velocity Fall Angle

2.5 deg 6800 yards 7.7 sec 2435 fps 2.8 deg
5.0 deg 12200 yards 14.9 sec 2121 fps 6.2 deg
7.5 deg 16700 yards 21.8 sec 1905 fps 10.0 deg
10.0 deg 20600 yards 28.3 sec 1756 fps 13.9 deg
12.5 deg 24000 yards 34.6 sec 1653 fps 18.1 deg
15.0 deg 27000 yards 40.6 sec 1584 fps 22.1 deg
20.0 deg 32300 yards 52.2 sec 1512 fps 30.0 deg
25.0 deg 36600 yards 63.2 sec 1501 fps 37.0 deg
30.0 deg 40300 yards 73.7 sec 1523 fps 42.9 deg
35.0 deg 43200 yards 83.8 sec 1564 fps 48.1 deg
40.0 deg 45300 yards 93.4 sec 1615 fps 52.5 deg
45.0 deg 46400 yards 102.5 sec 1669 fps 56.5 deg
50.0 deg 46300 yards 111.1 sec 1721 fps 60.2 deg


Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 32.66 inches


Elevation Range Belt Deck

1.5 deg 4300 yards 28 in
2.3 deg 6400 yards 26 in
3.3 deg 8700 yards 24 in
3.4 deg 8800 yards ... 1 in
4.5 deg 11200 yards 22 in
5.9 deg 14000 yards 20 in
6.3 deg 14700 yards ... 2 in
7.7 deg 17100 yards 18 in
9.7 deg 20200 yards ... 3 in
10.0 deg 20600 yards 16 in
13.1 deg 24800 yards 14 in
14.3 deg 26200 yards ... 4 in
17.7 deg 30000 yards 12 in
18.6 deg 30900 yards ... 5 in
22.1 deg 34200 yards ... 6 in
25.0 deg 36600 yards 10 in
25.6 deg 37100 yards ... 7 in
29.2 deg 39700 yards ... 8 in
32.8 deg 42000 yards ... 9 in
36.5 deg 43900 yards ... 10 in
37.4 deg 44300 yards 8 in
40.4 deg 45400 yards ... 11 in
44.4 deg 46300 yards ... 12 in
48.4 deg 46500 yards ... 13 in


Maximum range = 46500 yards at 47.4 deg elevation


The gun without the liners:

41 cm gun Model 1923

Caliber = 16.1 inch (41.0 cm)
Shell weight = 2300 lbs (1044 kg)
Muzzle velocity = 2744 fps (837 m/s)

Relative ballistic performance: 0.95

Muzzle energy = 365.3 megajoules = 134608.6 foot-tons

Relative muzzle energy: 1.00

Barrel length: 50 calibers


Elevation Range Time Velocity Fall Angle

2.5 deg 6200 yards 7.3 sec 2366 fps 2.8 deg
5.0 deg 11300 yards 14.2 sec 2102 fps 6.0 deg
7.5 deg 15600 yards 20.8 sec 1912 fps 9.5 deg
10.0 deg 19400 yards 27.1 sec 1776 fps 13.3 deg
12.5 deg 22700 yards 33.2 sec 1679 fps 17.2 deg
15.0 deg 25700 yards 39.2 sec 1610 fps 21.2 deg
20.0 deg 30800 yards 50.5 sec 1537 fps 28.7 deg
25.0 deg 35100 yards 61.2 sec 1520 fps 35.6 deg
30.0 deg 38700 yards 71.5 sec 1537 fps 41.6 deg
35.0 deg 41400 yards 81.3 sec 1573 fps 46.8 deg
40.0 deg 43400 yards 90.6 sec 1618 fps 51.4 deg
45.0 deg 44300 yards 99.4 sec 1668 fps 55.5 deg
50.0 deg 44100 yards 107.6 sec 1716 fps 59.3 deg


Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 32.91 inches


Elevation Range Belt Deck

1.1 deg 2800 yards 30 in
2.0 deg 5000 yards 28 in
3.0 deg 7300 yards 26 in
3.3 deg 7800 yards ... 1 in
4.2 deg 9800 yards 24 in
5.7 deg 12500 yards 22 in
6.1 deg 13200 yards ... 2 in
7.4 deg 15500 yards 20 in
9.2 deg 18200 yards ... 3 in
9.7 deg 18900 yards 18 in
12.6 deg 22800 yards 16 in
12.9 deg 23200 yards ... 4 in
16.7 deg 27500 yards 14 in
17.8 deg 28700 yards ... 5 in
20.9 deg 31700 yards ... 6 in
22.6 deg 33100 yards 12 in
24.1 deg 34400 yards ... 7 in
27.4 deg 36900 yards ... 8 in
30.7 deg 39100 yards ... 9 in
31.8 deg 39700 yards 10 in
34.1 deg 41000 yards ... 10 in
37.5 deg 42500 yards ... 11 in
41.2 deg 43700 yards ... 12 in
44.7 deg 44300 yards 8 in 13 in
48.6 deg 44300 yards ... 14 in

Maximum range = 44400 yards at 46.9 deg elevation

360mm Model 1911


Caliber = 14.2 inch (36.0 cm)
Shell weight = 1400 lbs (635 kg)
Muzzle velocity = 2697 fps (822 m/s)

Relative ballistic performance: 0.85

Muzzle energy = 214.8 megajoules = 79154.8 foot-tons

Relative muzzle energy: 0.87

Barrel length: 45 calibers


Elevation Range Time Velocity Fall Angle

2.5 deg 5800 yards 7.1 sec 2217 fps 2.9 deg
5.0 deg 10300 yards 13.7 sec 1912 fps 6.3 deg
7.5 deg 14000 yards 20.0 sec 1704 fps 10.2 deg
10.0 deg 17100 yards 25.9 sec 1563 fps 14.3 deg
12.5 deg 19800 yards 31.6 sec 1465 fps 18.5 deg
15.0 deg 22200 yards 37.1 sec 1398 fps 22.8 deg
20.0 deg 26300 yards 47.6 sec 1329 fps 31.1 deg
25.0 deg 29600 yards 57.4 sec 1315 fps 38.3 deg
30.0 deg 32300 yards 66.8 sec 1332 fps 44.5 deg
35.0 deg 34300 yards 75.8 sec 1365 fps 49.9 deg
40.0 deg 35700 yards 84.3 sec 1408 fps 54.4 deg
45.0 deg 36400 yards 92.3 sec 1453 fps 58.4 deg
50.0 deg 36200 yards 99.8 sec 1498 fps 62.0 deg


Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 26.31 inches


Elevation Range Belt Deck

1.6 deg 3900 yards 22 in
2.6 deg 6000 yards 20 in
3.9 deg 8300 yards 18 in
4.1 deg 8700 yards ... 1 in
5.4 deg 10900 yards 16 in
7.4 deg 13900 yards 14 in
8.1 deg 14700 yards ... 2 in
10.3 deg 17500 yards 12 in
13.5 deg 20800 yards ... 3 in
14.5 deg 21800 yards 10 in
19.0 deg 25500 yards ... 4 in
21.5 deg 27400 yards 8 in
23.5 deg 28700 yards ... 5 in
28.2 deg 31400 yards ... 6 in
33.0 deg 33600 yards ... 7 in
34.3 deg 34100 yards 6 in
38.0 deg 35300 yards ... 8 in
43.4 deg 36300 yards ... 9 in
49.0 deg 36300 yards ... 10 in


Maximum range = 36400 yards at 46.3 deg elevation

360mm Model 1918


Caliber = 14.2 inch (36.0 cm)
Shell weight = 1450 lbs (658 kg)
Muzzle velocity = 2651 fps (808 m/s)

Relative ballistic performance: 0.92

Muzzle energy = 214.8 megajoules = 79154.8 foot-tons

Relative muzzle energy: 0.87

Barrel length: 45 calibers


Elevation Range Time Velocity Fall Angle

2.5 deg 5700 yards 7.0 sec 2233 fps 2.8 deg
5.0 deg 10200 yards 13.6 sec 1952 fps 6.1 deg
7.5 deg 14000 yards 19.9 sec 1757 fps 9.9 deg
10.0 deg 17300 yards 25.9 sec 1619 fps 13.9 deg
12.5 deg 20100 yards 31.6 sec 1524 fps 17.9 deg
15.0 deg 22600 yards 37.1 sec 1458 fps 22.0 deg
20.0 deg 26900 yards 47.7 sec 1386 fps 30.0 deg
25.0 deg 30500 yards 57.7 sec 1370 fps 37.1 deg
30.0 deg 33300 yards 67.2 sec 1384 fps 43.3 deg
35.0 deg 35500 yards 76.3 sec 1417 fps 48.6 deg
40.0 deg 37000 yards 84.9 sec 1458 fps 53.2 deg
45.0 deg 37700 yards 93.1 sec 1504 fps 57.3 deg
50.0 deg 37500 yards 100.7 sec 1549 fps 61.0 deg


Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 26.31 inches


Elevation Range Belt Deck

1.9 deg 4400 yards 22 in
3.0 deg 6700 yards 20 in
4.0 deg 8600 yards ... 1 in
4.5 deg 9300 yards 18 in
6.3 deg 12200 yards 16 in
7.8 deg 14400 yards ... 2 in
8.7 deg 15600 yards 14 in
12.1 deg 19600 yards 12 in
12.6 deg 20300 yards ... 3 in
17.1 deg 24500 yards 10 in
18.4 deg 25700 yards ... 4 in
22.6 deg 28900 yards ... 5 in
25.4 deg 30700 yards 8 in
27.0 deg 31700 yards ... 6 in
31.4 deg 34000 yards ... 7 in
36.1 deg 35900 yards ... 8 in
40.0 deg 37000 yards 6 in
41.0 deg 37200 yards ... 9 in
46.0 deg 37700 yards ... 10 in


Maximum range = 37700 yards at 46.3 deg elevation

280 mm Model 1924

Caliber = 11.0 inch (28.0 cm)
Shell weight = 650 lbs (295 kg)
Muzzle velocity = 2913 fps (888 m/s)

Relative ballistic performance: 0.95

Muzzle energy = 116.3 megajoules = 42845.7 foot-tons

Relative muzzle energy: 1.00

Barrel length: 50 calibers


Elevation Range Time Velocity Fall Angle

2.5 deg 6400 yards 7.6 sec 2254 fps 3.0 deg
5.0 deg 11200 yards 14.5 sec 1883 fps 6.7 deg
7.5 deg 14900 yards 21.0 sec 1649 fps 10.9 deg
10.0 deg 18000 yards 27.1 sec 1496 fps 15.5 deg
12.5 deg 20700 yards 32.9 sec 1396 fps 20.1 deg
15.0 deg 23000 yards 38.5 sec 1330 fps 24.7 deg
20.0 deg 26900 yards 49.0 sec 1268 fps 33.2 deg
25.0 deg 30100 yards 59.0 sec 1261 fps 40.7 deg
30.0 deg 32700 yards 68.5 sec 1284 fps 47.0 deg
35.0 deg 34800 yards 77.6 sec 1322 fps 52.2 deg
40.0 deg 36200 yards 86.3 sec 1368 fps 56.5 deg
45.0 deg 36900 yards 94.5 sec 1415 fps 60.3 deg
50.0 deg 36800 yards 102.2 sec 1462 fps 63.6 deg


Armor Penetration - Vertical Belt Armor

(Relative armor quality, 1.00)

Maximum penetration: 22.47 inches


Elevation Range Belt Deck

1.5 deg 4100 yards 18 in
2.5 deg 6400 yards 16 in
3.7 deg 8900 yards 14 in
5.0 deg 11100 yards ... 1 in
5.4 deg 11900 yards 12 in
7.9 deg 15400 yards 10 in
10.7 deg 18800 yards ... 2 in
11.8 deg 20000 yards 8 in
18.1 deg 25500 yards ... 3 in
19.2 deg 26300 yards 6 in
24.1 deg 29600 yards ... 4 in
30.3 deg 32900 yards ... 5 in
36.3 deg 35200 yards 4 in
37.0 deg 35400 yards ... 6 in
44.3 deg 36900 yards ... 7 in

Maximum range = 37000 yards at 46.8 deg elevation