Naissus Class Cruiser

[snip]

The second of the Hexagons, the Naissus class introduces VTE engines and Quick-Firing guns.

Four Ships:

Naissus, Imperial Roman Republic Cruiser laid down 1897

Displacement:
   3,500 t light; 3,629 t standard; 4,026 t normal; 4,344 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (314.96 ft / 308.40 ft) x 42.65 ft x (20.51 / 21.75 ft)
   (96.00 m / 94.00 m) x 13.00 m  x (6.25 / 6.63 m)

Armament:
      6 - 5.51" / 140 mm 40.0 cal guns - 80.24lbs / 36.40kg shells, 125 per gun
     Quick firing guns in deck mounts, 1897 Model
     2 x Single mounts on centreline ends, evenly spread
     4 x Single mounts on side ends, evenly spread
      8 - 2.95" / 75.0 mm 45.0 cal guns - 12.98lbs / 5.89kg shells, 250 per gun
     Quick firing guns in deck mounts, 1897 Model
     6 x Single mounts on sides, evenly spread
     2 x Single mounts on sides, aft deck aft
      2 hull mounts in casemates- Limited use in all but light seas
      Weight of broadside 585 lbs / 265 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.18" / 30 mm   308.40 ft / 94.00 m   7.84 ft / 2.39 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.97" / 50 mm         -               -
   2nd:   0.59" / 15 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 1.57" / 40 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 5.91" / 150 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 11,200 ihp / 8,355 Kw = 20.59 kts
   Range 4,750nm at 10.00 kts
   Bunker at max displacement = 715 tons (100% coal)

Complement:
   252 - 328

Cost:
   £0.399 million / $1.597 million

Distribution of weights at normal displacement:
   Armament: 93 tons, 2.3 %
      - Guns: 93 tons, 2.3 %
   Armour: 437 tons, 10.9 %
      - Belts: 106 tons, 2.6 %
      - Armament: 42 tons, 1.0 %
      - Armour Deck: 257 tons, 6.4 %
      - Conning Tower: 32 tons, 0.8 %
   Machinery: 1,794 tons, 44.6 %
   Hull, fittings & equipment: 991 tons, 24.6 %
   Fuel, ammunition & stores: 526 tons, 13.1 %
   Miscellaneous weights: 185 tons, 4.6 %
      - Hull below water: 25 tons
      - Hull above water: 90 tons
      - On freeboard deck: 60 tons
      - Above deck: 10 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,089 lbs / 947 Kg = 24.9 x 5.5 " / 140 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.54
   Metacentric height 2.9 ft / 0.9 m
   Roll period: 10.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.17
   Seaboat quality  (Average = 1.00): 1.60

Hull form characteristics:
   Hull has low quarterdeck ,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.522 / 0.531
   Length to Beam Ratio: 7.23 : 1
   'Natural speed' for length: 17.56 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 44
   Bow angle (Positive = bow angles forward): -20.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   10.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Forward deck:   40.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Aft deck:   40.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Quarter deck:   10.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Average freeboard:      14.68 ft / 4.48 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 153.8 %
      - Above water (accommodation/working, high = better): 105.3 %
   Waterplane Area: 8,940 Square feet or 831 Square metres
   Displacement factor (Displacement / loading): 89 %
   Structure weight / hull surface area: 66 lbs/sq ft or 321 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 2.89
      - 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

Misc Distribution
--Below Water (20t)
----18t 12x350mm Torpedos (35 Pattern B)
----2t Additional Torpedo Handing Equipment
--Above Water (90t)
----10t Improved Officer Accommodations
----10t Improved Crew Accommodations
----20t Additional Troop Compliment
----25t Construction Reserve
--On Deck (60t)
----30t Additional Troop Compliment
----10t Flag Facilities
----5t Admiralty Accommodations
----15t Construction Reserve
--Above Deck (10t)
----5t Improved Aquisition Structures
----5t Additional Searchlights