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Heraclius, Byzantine Empire Battleship laid down 1927

Displacement:

60,919 t light; 65,092 t standard; 69,784 t normal; 73,537 t full load

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

(771.00 ft / 754.59 ft) x 134.51 ft x (37.89 / 39.56 ft)
(235.00 m / 230.00 m) x 41.00 m  x (11.55 / 12.06 m)

Armament: 12 - 18.00" / 457 mm 45.0 cal guns - 3,900.00lbs / 1,769.01kg shells, 90 per gun

  Breech loading guns in turret on barbette mounts, 1927 Model
  3 x 4-gun 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, 1927 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, 1927 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, 1927 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, 1927 Model
  16 x 4-gun mounts on centreline, aft deck forward

Weight of broadside 48,082 lbs / 21,810 kg

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

Main:    16.0" / 406 mm    411.00 ft / 125.27 m    17.00 ft / 5.18 m
Ends:    Unarmoured
  Main Belt covers 84 % of normal length
  Main Belt inclined 19.00 degrees (positive = in)

- Torpedo Bulkhead - Additional damage containing bulkheads:

    4.00" / 102 mm    420.00 ft / 128.02 m    38.00 ft / 11.58 m
Beam between torpedo bulkheads 94.00 ft / 28.65 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    2.00" / 51 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: 5.00" / 127 mm

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

Machinery:

Oil fired boilers, steam turbines,
Electric motors, 4 shafts, 87,365 shp / 65,174 Kw = 24.00 kts
Range 12,000nm at 14.00 kts
Bunker at max displacement = 8,446 tons

Complement:

2,146 - 2,790

Cost:

£21.493 million / $85.971 million

Distribution of weights at normal displacement:

Armament: 6,882 tons, 9.9 %
   - Guns: 6,882 tons, 9.9 %
Armour: 25,317 tons, 36.3 %
   - Belts: 5,270 tons, 7.6 %
   - Torpedo bulkhead: 2,362 tons, 3.4 %
   - Armament: 6,093 tons, 8.7 %
   - Armour Deck: 10,715 tons, 15.4 %
   - Conning Towers: 876 tons, 1.3 %
Machinery: 2,758 tons, 4.0 %
Hull, fittings & equipment: 25,833 tons, 37.0 %
Fuel, ammunition & stores: 8,865 tons, 12.7 %
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):
  104,664 lbs / 47,475 Kg = 35.9 x 18.0 " / 457 mm shells or 21.8 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 10.3 ft / 3.1 m
Roll period: 17.6 seconds
Steadiness    - As gun platform (Average = 50 %): 71 %
        - Recoil effect (Restricted arc if above 1.00): 0.70
Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:

Hull has a flush deck,
  an extended bulbous bow and small transom stern
Block coefficient (normal/deep): 0.635 / 0.641
Length to Beam Ratio: 5.61 : 1
'Natural speed' for length: 30.06 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 59
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 %,  31.17 ft / 9.50 m,  19.69 ft / 6.00 m
   - Forward deck:    30.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
   - Aft deck:    35.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
   - Quarter deck:    15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
   - Average freeboard:        20.60 ft / 6.28 m

Ship space, strength and comments:

Space    - Hull below water (magazines/engines, low = better): 83.6 %
    - Above water (accommodation/working, high = better): 136.2 %
Waterplane Area: 78,670 Square feet or 7,309 Square metres
Displacement factor (Displacement / loading): 110 %
Structure weight / hull surface area: 288 lbs/sq ft or 1,407 Kg/sq metre
Hull strength (Relative):
    - Cross-sectional: 0.95
    - Longitudinal: 1.58
    - Overall: 1.00
Adequate 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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