Light Cruisers

[Darman]

Pelorus, United Kingdom Light Cruiser laid down 1896 (Engine 1890)

Displacement:
   2,460 t light; 2,550 t standard; 3,175 t normal; 3,675 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (300.00 ft / 300.00 ft) x 36.50 ft x (16.00 / 18.12 ft)
   (91.44 m / 91.44 m) x 11.13 m  x (4.88 / 5.52 m)

Armament:
      8 - 4.00" / 102 mm 40.0 cal guns - 25.00lbs / 11.34kg shells, 200 per gun
     Breech loading guns in deck mounts, 1896 Model
     8 x Single mounts on sides amidships
      8 - 1.85" / 47.0 mm 40.0 cal guns - 3.00lbs / 1.36kg shells, 300 per gun
     Quick firing guns in deck mounts, 1896 Model
     8 x Single mounts on sides amidships
      Weight of broadside 224 lbs / 102 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm         -               -

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 8,919 ihp / 6,653 Kw = 20.00 kts
   Range 5,000nm at 12.00 kts
   Bunker at max displacement = 1,125 tons (100% coal)

Complement:
   210 - 274

Cost:
   £0.329 million / $1.318 million

Distribution of weights at normal displacement:
   Armament: 39 tons, 1.2 %
   Armour: 19 tons, 0.6 %
      - Armament: 19 tons, 0.6 %
   Machinery: 1,654 tons, 52.1 %
   Hull, fittings & equipment: 742 tons, 23.4 %
   Fuel, ammunition & stores: 715 tons, 22.5 %
   Miscellaneous weights: 6 tons, 0.2 %
      - Hull above water: 6 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,416 lbs / 642 Kg = 44.2 x 4.0 " / 102 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.97
   Metacentric height 3.2 ft / 1.0 m
   Roll period: 8.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 74 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality  (Average = 1.00): 1.47

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.634 / 0.648
   Length to Beam Ratio: 8.22 : 1
   'Natural speed' for length: 17.32 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 0.00 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 %,  19.05 ft / 5.81 m,  12.12 ft / 3.69 m
      - Forward deck:   30.00 %,  12.12 ft / 3.69 m,  12.12 ft / 3.69 m
      - Aft deck:   35.00 %,  12.12 ft / 3.69 m,  12.12 ft / 3.69 m
      - Quarter deck:   15.00 %,  12.12 ft / 3.69 m,  12.12 ft / 3.69 m
      - Average freeboard:      12.67 ft / 3.86 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 172.5 %
      - Above water (accommodation/working, high = better): 90.9 %
   Waterplane Area: 8,268 Square feet or 768 Square metres
   Displacement factor (Displacement / loading): 88 %
   Structure weight / hull surface area: 55 lbs/sq ft or 268 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.87
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Misc Weight:
6t for 2 hull-mounted fixed bow torpedo tubes with 4 reloads total. 

HMS Pelorus
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