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John II Komnenos, Byzantine Empire Battleship laid down 1926


Displacement:

51,526 t light; 55,091 t standard; 58,898 t normal; 61,944 t full load


Dimensions: Length (overall / waterline) x beam x draught (normal/deep)

(741.89 ft / 725.07 ft) x 118.11 ft x (37.73 / 39.30 ft)
(226.13 m / 221.00 m) x 36.00 m  x (11.50 / 11.98 m)

Armament:

9 - 18.00" / 457 mm 45.0 cal guns - 3,900.00lbs / 1,769.01kg shells, 100 per gun

Breech loading guns in turret on barbette mounts, 1926 Model
3 x Triple mounts on centreline ends, majority forward
1 raised mount - superfiring

20 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 500 per gun

Dual purpose guns in deck and hoist mounts, 1926 Model
10 x Twin mounts on sides, evenly spread
4 raised mounts

40 - 1.57" / 40.0 mm 56.0 cal guns - 2.12lbs / 0.96kg shells, 2,000 per gun

Anti-air guns in deck mounts, 1926 Model
10 x Quad mounts on side ends, majority aft
4 raised mounts - superfiring

40 - 0.79" / 20.0 mm 70.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun

Anti-air guns in deck mounts, 1926 Model
10 x Quad mounts on side ends, majority aft

16 - 0.50" / 12.7 mm 12.0 cal guns - 0.04lbs / 0.02kg shells, 4,000 per gun

Anti-air guns in deck mounts, 1926 Model
16 x 4-gun mounts on centreline, aft deck forward

Weight of broadside 36,382 lbs / 16,503 kg


Armour:

- Belts: Width (max) Length (avg) Height (avg)

Main:    16.0" / 406 mm    392.00 ft / 119.48 m    18.00 ft / 5.49 m
Ends:    Unarmoured
Main Belt covers 83 % of normal length
Main Belt inclined 19.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:

4.00" / 102 mm    400.00 ft / 121.92 m    38.00 ft / 11.58 m
Beam between torpedo bulkheads 78.00 ft / 23.77 m


- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main:    26.0" / 660 mm    12.0" / 305 mm        19.0" / 483 mm
2nd:    3.00" / 76 mm    3.00" / 76 mm        3.00" / 76 mm
3rd:    0.50" / 13 mm          -                  -
4th:    0.50" / 13 mm          -                  -
5th:    0.50" / 13 mm          -                  -


- Armoured deck - multiple decks:

For and Aft decks: 8.00" / 203 mm
Forecastle: 3.50" / 89 mm  Quarter deck: 4.50" / 114 mm

- Conning towers: Forward 16.00" / 406 mm, Aft 8.00" / 203 mm

Machinery:

Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 74,847 shp / 55,836 Kw = 24.00 kts
Range 10,000nm at 14.00 kts
Bunker at max displacement = 6,853 tons

Complement:

1,889 - 2,457

Cost:

£16.268 million / $65.071 million

Distribution of weights at normal displacement:

Armament: 4,350 tons, 7.4 %
- Guns: 4,350 tons, 7.4 %
Armour: 22,825 tons, 38.8 %
- Belts: 5,246 tons, 8.9 %
- Torpedo bulkhead: 2,250 tons, 3.8 %
- Armament: 5,396 tons, 9.2 %
- Armour Deck: 9,151 tons, 15.5 %
- Conning Towers: 783 tons, 1.3 %
Machinery: 2,396 tons, 4.1 %
Hull, fittings & equipment: 21,825 tons, 37.1 %
Fuel, ammunition & stores: 7,372 tons, 12.5 %
Miscellaneous weights: 130 tons, 0.2 %
- Hull above water: 30 tons
- On freeboard deck: 100 tons

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):
96,583 lbs / 43,809 Kg = 33.1 x 18.0 " / 457 mm shells or 19.4 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 8.1 ft / 2.5 m
Roll period: 17.5 seconds
Steadiness    - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.91
Seaboat quality  (Average = 1.00): 1.37

Hull form characteristics:

Hull has a flush deck,
an extended bulbous bow and large transom stern
Block coefficient (normal/deep): 0.638 / 0.644
Length to Beam Ratio: 6.14 : 1
'Natural speed' for length: 31.52 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end,     Aft end
- Forecastle:    20.00 %,  36.09 ft / 11.00 m,  21.33 ft / 6.50 m
- Forward deck:    30.00 %,  21.33 ft / 6.50 m,  21.33 ft / 6.50 m
- Aft deck:    35.00 %,  21.33 ft / 6.50 m,  21.33 ft / 6.50 m
- Quarter deck:    15.00 %,  21.33 ft / 6.50 m,  21.33 ft / 6.50 m
- Average freeboard:        22.51 ft / 6.86 m


Ship space, strength and comments:

Space    - Hull below water (magazines/engines, low = better): 83.1 %
- Above water (accommodation/working, high = better): 144.0 %
Waterplane Area: 67,676 Square feet or 6,287 Square metres
Displacement factor (Displacement / loading): 113 %
Structure weight / hull surface area: 257 lbs/sq ft or 1,255 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.75
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

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