Ovilava Class Cruisers

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The last VTE cruisers of the Roman Navy, the Ovilava class sees a drastic change in armament. This does not come without issue, as the design is horribly cramped.

Four Ships:

Ovilava, Imperial Roman Republic Cruiser laid down 1902

Displacement:
   4,800 t light; 5,021 t standard; 5,512 t normal; 5,905 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (351.05 ft / 351.05 ft) x 54.13 ft x (20.51 / 21.60 ft)
   (107.00 m / 107.00 m) x 16.50 m  x (6.25 / 6.58 m)

Armament:
      10 - 5.51" / 140 mm 50.0 cal guns - 85.98lbs / 39.00kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1902 Model
     2 x Single mounts on centreline ends, evenly spread
     8 x Single mounts on sides, evenly spread
      6 - 2.95" / 75.0 mm 50.0 cal guns - 13.23lbs / 6.00kg shells, 350 per gun
     Quick firing guns in deck and hoist mounts, 1902 Model
     2 x Single mounts on centreline ends, evenly spread
      2 raised mounts
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 939 lbs / 426 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.57" / 40 mm   0.39" / 10 mm      1.57" / 40 mm
   2nd:   0.59" / 15 mm   0.20" / 5 mm      1.57" / 40 mm

   - Protected deck - single deck:
   For and Aft decks: 2.76" / 70 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 3.94" / 100 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 16,500 ihp / 12,309 Kw = 21.88 kts
   Range 5,500nm at 10.00 kts
   Bunker at max displacement = 884 tons (90% coal)

Complement:
   319 - 415

Cost:
   £0.617 million / $2.468 million

Distribution of weights at normal displacement:
   Armament: 290 tons, 5.3 %
      - Guns: 290 tons, 5.3 %
   Armour: 657 tons, 11.9 %
      - Armament: 51 tons, 0.9 %
      - Armour Deck: 579 tons, 10.5 %
      - Conning Tower: 26 tons, 0.5 %
   Machinery: 2,475 tons, 44.9 %
   Hull, fittings & equipment: 1,278 tons, 23.2 %
   Fuel, ammunition & stores: 712 tons, 12.9 %
   Miscellaneous weights: 100 tons, 1.8 %
      - Hull below water: 5 tons
      - Hull above water: 40 tons
      - On freeboard deck: 40 tons
      - Above deck: 15 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,324 lbs / 1,054 Kg = 27.8 x 5.5 " / 140 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.54
   Metacentric height 4.2 ft / 1.3 m
   Roll period: 11.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.26
   Seaboat quality  (Average = 1.00): 1.31

Hull form characteristics:
   Hull has low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.495 / 0.504
   Length to Beam Ratio: 6.48 : 1
   'Natural speed' for length: 18.74 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 53
   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 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Forward deck:   30.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Aft deck:   35.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Quarter deck:   15.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Average freeboard:      14.23 ft / 4.34 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 163.5 %
      - Above water (accommodation/working, high = better): 117.3 %
   Waterplane Area: 12,603 Square feet or 1,171 Square metres
   Displacement factor (Displacement / loading): 82 %
   Structure weight / hull surface area: 73 lbs/sq ft or 357 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.83
      - Longitudinal: 1.96
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Cramped 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

Misc Distribution
--Below Water (5t)
----5t Additional Pumps
--Above Water (40t)
----10t Improved Officer Accommodations
----10t Improved Crew Accommodations
----10t Short-Range Wireless
----5t Improved Ventilation
----5t Construction Reserve
--On Deck (40t)
----16t 8x450mm Torpedos (45 Pattern A)
----10t Short-Range Wireless
----4t Improved Torpedo Handling Equipment
----5t Additional Officer accommodations
----5t Construction Reserve
--Above Deck (15t)
----10t Improved Aquisition Structures
----5t Additional Searchlights