Third Class Cruisers

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Information on Third Class Cruisers of the Royal Navy.

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Ships in Class: Pegasus, Ceberus, Empousa, Gorgons, Harpies, Kobaloi, Mormo, Taraxippi, Asbolus, Lamia, Hippocampi, Ipotane, Ophiotaurus, Satyrs, Sphinx, Amphisbaena, Chrysomallus, Karkinos, Phoenix, Nemean Lion, Agrius, Tityos, Ladon, Cychreides

Pegasus, United Kingdom Third Class Cruiser laid down 1895

Displacement:
   1,640 t light; 1,723 t standard; 2,136 t normal; 2,466 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 / 17.69 ft)
   (91.44 m / 91.44 m) x 11.13 m  x (4.88 / 5.39 m)

Armament:
      6 - 4.00" / 102 mm 40.0 cal guns - 30.00lbs / 13.61kg shells, 250 per gun
     Quick firing guns in deck mounts, 1895 Model
     2 x Single mounts on centreline ends, evenly spread
     4 x Single mounts on side ends, evenly spread
      6 - 3.00" / 76.2 mm 40.0 cal guns - 12.94lbs / 5.87kg shells, 350 per gun
     Breech loading guns in deck mounts, 1895 Model
     6 x Single mounts on sides, evenly spread
      Weight of broadside 258 lbs / 117 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.25" / 6 mm   0.25" / 6 mm            -

   - Protected deck - single deck:
   For and Aft decks: 1.00" / 25 mm
   Forecastle: 0.50" / 13 mm  Quarter deck: 0.50" / 13 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 5,000 ihp / 3,730 Kw = 18.69 kts
   Range 7,000nm at 10.00 kts
   Bunker at max displacement = 743 tons (100% coal)

Complement:
   156 - 204

Cost:
   £0.187 million / $0.750 million

Distribution of weights at normal displacement:
   Armament: 41 tons, 1.9 %
      - Guns: 41 tons, 1.9 %
   Armour: 125 tons, 5.9 %
      - Armament: 9 tons, 0.4 %
      - Armour Deck: 116 tons, 5.4 %
   Machinery: 847 tons, 39.7 %
   Hull, fittings & equipment: 622 tons, 29.1 %
   Fuel, ammunition & stores: 496 tons, 23.2 %
   Miscellaneous weights: 5 tons, 0.2 %
      - On freeboard deck: 5 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,550 lbs / 703 Kg = 48.5 x 4.0 " / 102 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.74
   Metacentric height 2.7 ft / 0.8 m
   Roll period: 9.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 95 %
         - Recoil effect (Restricted arc if above 1.00): 0.12
   Seaboat quality  (Average = 1.00): 1.89

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.427 / 0.446
   Length to Beam Ratio: 8.22 : 1
   'Natural speed' for length: 17.32 kts
   Power going to wave formation at top speed: 45 %
   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 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Forward deck:   30.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Aft deck:   35.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Quarter deck:   15.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Average freeboard:      11.00 ft / 3.35 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 135.1 %
      - Above water (accommodation/working, high = better): 92.1 %
   Waterplane Area: 6,858 Square feet or 637 Square metres
   Displacement factor (Displacement / loading): 110 %
   Structure weight / hull surface area: 55 lbs/sq ft or 270 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.99
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather