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Sparta, Byzantium Cruiser laid down 1923

Displacement:

   15,816 t light; 16,858 t standard; 19,111 t normal; 20,914 t full load

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

   (639.02 ft / 606.96 ft) x 78.74 ft x (29.53 / 31.48 ft)
   (194.77 m / 185.00 m) x 24.00 m  x (9.00 / 9.59 m)

Armament:

     9 - 8.00" / 203 mm 55.0 cal guns - 276.33lbs / 125.34kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1923 Model
     3 x 3-gun mounts on centreline ends, majority forward
       1 raised mount - superfiring
     12 - 5.00" / 127 mm 25.0 cal guns - 56.77lbs / 25.75kg shells, 1,000 per gun
     Anti-air guns in deck and hoist mounts, 1923 Model
     6 x Twin mounts on sides, evenly spread
       3 raised mounts
     32 - 1.57" / 40.0 mm 40.0 cal guns - 1.87lbs / 0.85kg shells, 2,000 per gun
     Anti-air guns in deck mounts, 1923 Model
     8 x 4-gun mounts on sides, evenly spread
       4 raised mounts
     24 - 0.79" / 20.0 mm 70.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
     Anti-air guns in deck mounts, 1923 Model
     6 x 4-gun mounts on sides, evenly spread
     12 - 0.50" / 12.7 mm 12.0 cal guns - 0.04lbs / 0.02kg shells, 3,000 per gun
     Machine guns in deck mounts, 1923 Model
     12 x Single mounts on sides, evenly spread
     Weight of broadside 3,235 lbs / 1,467 kg
     Main Torpedoes
     12 - 21.0" / 533 mm, 30.00 ft / 9.14 m torpedoes - 1.906 t each, 22.876 t total
   In 6 sets of deck mounted centre rotating tubes
     2nd Torpedoes
     24 - 21.0" / 533 mm, 30.00 ft / 9.14 m torpedoes - 1.906 t each, 45.752 t total
   In 6 sets of deck mounted carriage/fixed tubes
     Mines
     6 - 0.00 lbs / 0.00 kg mines + 6 reloads - 0.000 t total
   in Above water - Stern racks/rails

Armour:

  - Belts:        Width (max)    Length (avg)        Height (avg)
   Main:    9.00" / 229 mm    420.00 ft / 128.02 m    18.00 ft / 5.49 m
   Ends:    Unarmoured
     Main Belt covers 106 % of normal length
     Main Belt inclined 19.00 degrees (positive = in)
  - Torpedo Bulkhead - Strengthened structural bulkheads:
       4.00" / 102 mm    420.00 ft / 128.02 m    30.00 ft / 9.14 m
   Beam between torpedo bulkheads 58.00 ft / 17.68 m
  - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
   Main:    12.0" / 305 mm    8.00" / 203 mm        8.00" / 203 mm
   2nd:    0.50" / 13 mm    0.50" / 13 mm        0.50" / 13 mm
   4th:    0.50" / 13 mm          -                  -
   5th:    0.50" / 13 mm    0.50" / 13 mm              -
  - Armoured deck - multiple decks:
   For and Aft decks: 3.00" / 76 mm
   Forecastle: 2.00" / 51 mm  Quarter deck: 3.00" / 76 mm
  - Conning towers: Forward 7.00" / 178 mm, Aft 4.00" / 102 mm

Machinery:

   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 101,032 shp / 75,370 Kw = 31.50 kts
   Range 10,000nm at 15.00 kts
   Bunker at max displacement = 4,055 tons

Complement:

   812 - 1,056

Cost:

   £3.933 million / $15.734 million

Distribution of weights at normal displacement:

   Armament: 1,054 tons, 5.5 %
      - Guns: 951 tons, 5.0 %
      - Weapons: 103 tons, 0.5 %
   Armour: 7,572 tons, 39.6 %
      - Belts: 2,840 tons, 14.9 %
      - Torpedo bulkhead: 1,865 tons, 9.8 %
      - Armament: 965 tons, 5.1 %
      - Armour Deck: 1,733 tons, 9.1 %
      - Conning Towers: 169 tons, 0.9 %
   Machinery: 3,377 tons, 17.7 %
   Hull, fittings & equipment: 3,866 tons, 20.2 %
   Fuel, ammunition & stores: 3,295 tons, 17.2 %
   Miscellaneous weights: 36 tons, 0.2 %
      - On freeboard deck: 36 tons

Overall survivability and seakeeping ability:

   Survivability (Non-critical penetrating hits needed to sink ship):
     23,688 lbs / 10,745 Kg = 92.5 x 8.0 " / 203 mm shells or 3.1 torpedoes
   Stability (Unstable if below 1.00): 1.06
   Metacentric height 3.9 ft / 1.2 m
   Roll period: 16.7 seconds
   Steadiness    - As gun platform (Average = 50 %): 74 %
           - Recoil effect (Restricted arc if above 1.00): 0.33
   Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:

   Hull has raised forecastle, raised quarterdeck ,
     a normal bow and large transom stern
   Block coefficient (normal/deep): 0.474 / 0.487
   Length to Beam Ratio: 7.71 : 1
   'Natural speed' for length: 28.83 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 72
   Bow angle (Positive = bow angles forward): 30.00 degrees
   Stern overhang: 13.12 ft / 4.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
               Fore end,     Aft end
      - Forecastle:    25.00 %,  32.81 ft / 10.00 m,  26.25 ft / 8.00 m
      - Forward deck:    30.00 %,  19.69 ft / 6.00 m,  16.40 ft / 5.00 m
      - Aft deck:    30.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Quarter deck:    15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:        20.51 ft / 6.25 m

Ship space, strength and comments:

   Space    - Hull below water (magazines/engines, low = better): 103.2 %
       - Above water (accommodation/working, high = better): 67.8 %
   Waterplane Area: 32,334 Square feet or 3,004 Square metres
   Displacement factor (Displacement / loading): 109 %
   Structure weight / hull surface area: 128 lbs/sq ft or 624 Kg/sq metre
   Hull strength (Relative):
       - Cross-sectional: 0.95
       - Longitudinal: 1.62
       - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

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