Zoraster-Class Seaplane Carrier

[TacCovert4]

HMS Zoraster, Aztec/Parthian Built Seaplane/EX Carrier laid down 1920

Displacement:
   6,494 t light; 6,737 t standard; 7,568 t normal; 8,233 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (489.04 ft / 485.56 ft) x 55.77 ft x (17.16 / 18.37 ft)
   (149.06 m / 148.00 m) x 17.00 m  x (5.23 / 5.60 m)

Armament:
      10 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck mounts, 1920 Model
     10 x Single mounts on sides, evenly spread
      6 - 2.76" / 70.0 mm 50.0 cal guns - 11.08lbs / 5.03kg shells, 300 per gun
     Anti-air guns in deck mounts, 1920 Model
     6 x Single mounts on sides, evenly spread
      6 raised mounts
      24 - 0.47" / 12.0 mm 70.0 cal guns - 0.06lbs / 0.03kg shells, 2,000 per gun
     Machine guns in deck mounts, 1920 Model
     12 x Twin mounts on sides, evenly spread
      12 raised mounts
      Weight of broadside 778 lbs / 353 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Ends:   Unarmoured

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.18" / 30 mm   393.70 ft / 120.00 m   14.76 ft / 4.50 m
   Beam between torpedo bulkheads 32.81 ft / 10.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm   1.10" / 28 mm            -

   - Box over machinery & magazines:
   1.97" / 50 mm

   - Conning towers: Forward 1.97" / 50 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 2 shafts, 25,641 shp / 19,128 Kw = 24.00 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 1,496 tons

Complement:
   405 - 527

Cost:
   £0.933 million / $3.732 million

Distribution of weights at normal displacement:
   Armament: 153 tons, 2.0%
      - Guns: 153 tons, 2.0%
   Armour: 708 tons, 9.4%
      - Torpedo bulkhead: 254 tons, 3.4%
      - Armament: 83 tons, 1.1%
      - Armour Deck: 354 tons, 4.7%
      - Conning Tower: 16 tons, 0.2%
   Machinery: 897 tons, 11.8%
   Hull, fittings & equipment: 2,797 tons, 37.0%
   Fuel, ammunition & stores: 1,074 tons, 14.2%
   Miscellaneous weights: 1,940 tons, 25.6%
      - Hull below water: 994 tons
      - Hull above water: 770 tons
      - On freeboard deck: 100 tons
      - Above deck: 76 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     19,102 lbs / 8,664 Kg = 285.0 x 5.1 " / 130 mm shells or 2.9 torpedoes
   Stability (Unstable if below 1.00): 1.28
   Metacentric height 3.3 ft / 1.0 m
   Roll period: 13.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.19
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has low forecastle, low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.570 / 0.579
   Length to Beam Ratio: 8.71 : 1
   'Natural speed' for length: 22.04 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 10.00 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%,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Forward deck:   30.00%,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Aft deck:   35.00%,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Quarter deck:   15.00%,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      24.61 ft / 7.50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 119.9%
      - Above water (accommodation/working, high = better): 267.4%
   Waterplane Area: 19,258 Square feet or 1,789 Square metres
   Displacement factor (Displacement / loading): 156%
   Structure weight / hull surface area: 81 lbs/sq ft or 394 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.87
      - Longitudinal: 3.41
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Excellent 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

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