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Lightning, Cascadia Large Cruiser laid down 1921

Units: 4

  • CRS Lightning
  • CRS Whirlwind
  • CRS Tornado
  • CRS Tempest

Displacement:
    29,692 t light; 31,070 t standard; 35,807 t normal; 39,596 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
    (771.36 ft / 764.00 ft) x 95.00 ft x (31.00 / 33.50 ft)
    (235.11 m / 232.87 m) x 28.96 m  x (9.45 / 10.21 m)

Armament:
      9 - 10.00" / 254 mm 51.0 cal guns - 600.01lbs / 272.16kg shells, 125 per gun
      Breech loading guns in turret on barbette mounts, 1921 Model
      3 x 3-gun mounts on centreline ends, majority forward
        1 raised mount - superfiring
      16 - 5.00" / 127 mm 43.0 cal guns - 61.05lbs / 27.69kg shells, 300 per gun
      Dual purpose guns in deck and hoist mounts, 1921 Model
      8 x Twin mounts on sides, evenly spread
        4 raised mounts
      24 - 1.57" / 40.0 mm 40.0 cal guns - 1.87lbs / 0.85kg shells, 5,000 per gun
      Anti-air guns in deck mounts, 1921 Model
      6 x 2 row quad mounts on sides, evenly spread
        6 raised mounts
      Weight of broadside 6,422 lbs / 2,913 kg
      Main Torpedoes
      4 - 21.0" / 533 mm, 16.00 ft / 4.88 m torpedoes - 1.070 t each, 4.281 t total
    In 2 sets of deck mounted side rotating tubes
      2nd Torpedoes
      12 - 21.0" / 533 mm, 16.00 ft / 4.88 m torpedoes - 1.070 t each, 12.844 t total
    In 1 sets of deck mounted reloads

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    13.0" / 330 mm    470.00 ft / 143.26 m    15.00 ft / 4.57 m
    Ends:    Unarmoured
      Main Belt covers 95 % of normal length
      Main Belt inclined 10.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
        3.00" / 76 mm    470.00 ft / 143.26 m    30.00 ft / 9.14 m
    Beam between torpedo bulkheads 75.10 ft / 22.89 m

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    10.0" / 254 mm    6.00" / 152 mm        10.0" / 254 mm
    2nd:    3.00" / 76 mm          -            3.00" / 76 mm

   - Armoured deck - multiple decks:
    For and Aft decks: 5.00" / 127 mm

   - Conning towers: Forward 4.00" / 102 mm, Aft 3.00" / 76 mm

Machinery:
    Oil fired boilers, steam turbines,
    Electric cruising motors plus geared drives, 4 shafts, 184,000 shp / 137,264 Kw = 33.57 kts
    Range 10,000nm at 18.00 kts
    Bunker at max displacement = 8,525 tons

Complement:
    1,300 - 1,691

Cost:
    £6.427 million / $25.706 million

Distribution of weights at normal displacement:
    Armament: 1,754 tons, 4.9 %
       - Guns: 1,730 tons, 4.8 %
       - Weapons: 25 tons, 0.1 %
    Armour: 10,832 tons, 30.3 %
       - Belts: 3,921 tons, 11.0 %
       - Torpedo bulkhead: 1,565 tons, 4.4 %
       - Armament: 1,370 tons, 3.8 %
       - Armour Deck: 3,812 tons, 10.6 %
       - Conning Towers: 164 tons, 0.5 %
    Machinery: 6,336 tons, 17.7 %
    Hull, fittings & equipment: 10,702 tons, 29.9 %
    Fuel, ammunition & stores: 6,115 tons, 17.1 %
    Miscellaneous weights: 67 tons, 0.2 %
       - On freeboard deck: 67 tons

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      50,792 lbs / 23,039 Kg = 101.6 x 10.0 " / 254 mm shells or 9.4 torpedoes
    Stability (Unstable if below 1.00): 1.14
    Metacentric height 5.9 ft / 1.8 m
    Roll period: 16.4 seconds
    Steadiness    - As gun platform (Average = 50 %): 70 %
            - Recoil effect (Restricted arc if above 1.00): 0.37
    Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
    Hull has a flush deck,
      a normal bow and large transom stern
    Block coefficient (normal/deep): 0.557 / 0.570
    Length to Beam Ratio: 8.04 : 1
    'Natural speed' for length: 31.89 kts
    Power going to wave formation at top speed: 58 %
    Trim (Max stability = 0, Max steadiness = 100): 70
    Bow angle (Positive = bow angles forward): 5.00 degrees
    Stern overhang: 5.00 ft / 1.52 m
    Freeboard (% = length of deck as a percentage of waterline length):
                Fore end,     Aft end
       - Forecastle:    20.00 %,  27.00 ft / 8.23 m,  23.00 ft / 7.01 m
       - Forward deck:    30.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
       - Aft deck:    30.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
       - Quarter deck:    20.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
       - Average freeboard:        23.32 ft / 7.11 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 93.8 %
        - Above water (accommodation/working, high = better): 175.9 %
    Waterplane Area: 53,090 Square feet or 4,932 Square metres
    Displacement factor (Displacement / loading): 122 %
    Structure weight / hull surface area: 155 lbs/sq ft or 757 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.98
        - Longitudinal: 1.24
        - Overall: 1.00
    Adequate machinery, storage, compartmentation space
    Excellent accommodation and workspace room
    Ship has slow, easy roll, a good, steady gun platform

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