Vallum Class Coastal Defense Ship

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One Ship
--IRS Vallum

CCDS-13, Imperial Roman Republic Colonial Coast Defense Ship laid down 1913

Displacement:
   5,000 t light; 5,207 t standard; 5,385 t normal; 5,527 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (306.76 ft / 306.76 ft) x 73.82 ft x (16.40 / 16.73 ft)
   (93.50 m / 93.50 m) x 22.50 m  x (5.00 / 5.10 m)

Armament:
      4 - 8.27" / 210 mm 45.0 cal guns - 242.51lbs / 110.00kg shells, 90 per gun
     Breech loading guns in turret on barbette mounts, 1905 Model
     2 x Twin mounts on centreline ends, evenly spread
      6 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 175 per gun
     Quick firing guns in deck and hoist mounts, 1909 Model
     4 x Single mounts on sides, evenly spread
     2 x Single mounts on centreline ends, evenly spread
      2 raised mounts
      2 - 1.77" / 45.0 mm 50.0 cal guns - 2.94lbs / 1.34kg shells, 200 per gun
     Quick firing guns in deck mounts, 1909 Model
     2 x Single mounts on sides, forward deck centre
      2 raised mounts
      Weight of broadside 1,492 lbs / 677 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.09" / 180 mm   199.38 ft / 60.77 m   16.40 ft / 5.00 m
   Ends:   3.94" / 100 mm   107.35 ft / 32.72 m   16.40 ft / 5.00 m
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   7.87" / 200 mm   4.72" / 120 mm      7.09" / 180 mm
   2nd:   0.59" / 15 mm   0.20" / 5 mm      1.97" / 50 mm

   - Protected deck - single deck:
   For and Aft decks: 2.56" / 65 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 7.87" / 200 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Electric motors, 2 shafts, 4,000 ihp / 2,984 Kw = 14.84 kts
   Range 3,500nm at 8.00 kts
   Bunker at max displacement = 320 tons (90% coal)

Complement:
   313 - 408

Cost:
   £0.416 million / $1.665 million

Distribution of weights at normal displacement:
   Armament: 434 tons, 8.1 %
      - Guns: 434 tons, 8.1 %
   Armour: 2,281 tons, 42.4 %
      - Belts: 1,339 tons, 24.9 %
      - Armament: 238 tons, 4.4 %
      - Armour Deck: 652 tons, 12.1 %
      - Conning Tower: 52 tons, 1.0 %
   Machinery: 261 tons, 4.9 %
   Hull, fittings & equipment: 1,659 tons, 30.8 %
   Fuel, ammunition & stores: 385 tons, 7.1 %
   Miscellaneous weights: 365 tons, 6.8 %
      - Hull below water: 75 tons
      - Hull above water: 50 tons
      - On freeboard deck: 200 tons
      - Above deck: 40 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     13,061 lbs / 5,924 Kg = 46.2 x 8.3 " / 210 mm shells or 3.5 torpedoes
   Stability (Unstable if below 1.00): 1.55
   Metacentric height 6.6 ft / 2.0 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.11
   Seaboat quality  (Average = 1.00): 1.35

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.507 / 0.511
   Length to Beam Ratio: 4.16 : 1
   'Natural speed' for length: 17.51 kts
   Power going to wave formation at top speed: 44 %
   Trim (Max stability = 0, Max steadiness = 100): 52
   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 %,  10.66 ft / 3.25 m,  10.66 ft / 3.25 m
      - Forward deck:   30.00 %,  10.66 ft / 3.25 m,  10.66 ft / 3.25 m
      - Aft deck:   35.00 %,  10.66 ft / 3.25 m,  10.66 ft / 3.25 m
      - Quarter deck:   15.00 %,  10.66 ft / 3.25 m,  10.66 ft / 3.25 m
      - Average freeboard:      10.66 ft / 3.25 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 47.6 %
      - Above water (accommodation/working, high = better): 98.6 %
   Waterplane Area: 15,190 Square feet or 1,411 Square metres
   Displacement factor (Displacement / loading): 112 %
   Structure weight / hull surface area: 101 lbs/sq ft or 495 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.89
      - Overall: 1.02
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

66t Below Water for Electric Drive
44t On Deck for FC

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In 1923H1, the Vallum was updated to 1918 Fire Control