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Sparta, Byzantium Cruiser laid down 1926

Displacement:

16,690 t light; 17,566 t standard; 19,797 t normal; 21,582 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 / 31.43 ft)
(194.77 m / 185.00 m) x 24.00 m  x (9.00 / 9.58 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, 1926 Model
  3 x Triple mounts on centreline ends, majority forward
    1 raised mount - superfiring

12 - 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
  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, 1926 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, 1926 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, 1926 Model
  12 x Single mounts on sides, evenly spread

Weight of broadside 3,266 lbs / 1,481 kg Main Torpedoes 12 - 21.0" / 533 mm, 30.00 ft / 9.14 m torpedoes - 1.918 t each, 23.020 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 - 1.918 t each, 46.040 t total

In 6 sets of deck mounted carriage/fixed tubes

Mines 12 - 2,000.00 lbs / 907.18 kg mines + 6 reloads - 16.071 t total

in Above water - Stern racks/rails

Main DC/AS Mortars 12 - 2,000.00 lbs / 907.18 kg Depth Charges + 6 reloads - 16.071 t total

in Stern depth charge racks

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        9.00" / 229 mm
2nd:    3.00" / 76 mm    3.00" / 76 mm        3.00" / 76 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, 110,870 shp / 82,709 Kw = 32.00 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 4,016 tons

Complement:

833 - 1,084

Cost:

£4.933 million / $19.733 million

Distribution of weights at normal displacement:

Armament: 980 tons, 5.0 %
   - Guns: 836 tons, 4.2 %
   - Weapons: 144 tons, 0.7 %
Armour: 7,766 tons, 39.2 %
   - Belts: 2,844 tons, 14.4 %
   - Torpedo bulkhead: 1,865 tons, 9.4 %
   - Armament: 1,124 tons, 5.7 %
   - Armour Deck: 1,760 tons, 8.9 %
   - Conning Towers: 173 tons, 0.9 %
Machinery: 3,549 tons, 17.9 %
Hull, fittings & equipment: 4,345 tons, 21.9 %
Fuel, ammunition & stores: 3,107 tons, 15.7 %
Miscellaneous weights: 50 tons, 0.3 %
   - On freeboard deck: 50 tons

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):
  25,544 lbs / 11,587 Kg = 99.8 x 8.0 " / 203 mm shells or 3.1 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 3.7 ft / 1.1 m
Roll period: 17.1 seconds
Steadiness    - As gun platform (Average = 50 %): 74 %
        - Recoil effect (Restricted arc if above 1.00): 0.39
Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:

Hull has raised forecastle,
  an extended bulbous bow and large transom stern
Block coefficient (normal/deep): 0.491 / 0.503
Length to Beam Ratio: 7.71 : 1
'Natural speed' for length: 28.76 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 73
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,  19.69 ft / 6.00 m
   - Aft deck:    30.00 %,  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:        21.98 ft / 6.70 m

Ship space, strength and comments:

Space    - Hull below water (magazines/engines, low = better): 103.3 %
    - Above water (accommodation/working, high = better): 77.8 %
Waterplane Area: 32,838 Square feet or 3,051 Square metres
Displacement factor (Displacement / loading): 109 %
Structure weight / hull surface area: 131 lbs/sq ft or 639 Kg/sq metre
Hull strength (Relative):
    - Cross-sectional: 0.94
    - Longitudinal: 1.72
    - 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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