Gloriosum Class Battleship

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The oldest class of battleship still on the naval lists as of 1910, the Gloriosum class battleship also represents the first major step away from smaller, less seaworthy coastal defense ships. The class is also the first to use the combination of a fully enclosed turret on a barbette. As such, the class has some flaws when compared with later contemporaries. Maintained at this point for the role she displaced, retirement from any likelihood of frontline service is likely coming within a few years.

Ships in Class: Two
--IRS Gloriosum
--IRS Timere

Gloriosum, Imperial Roman Republic Battleship laid down 1890

Displacement:
   11,000 t light; 11,431 t standard; 12,184 t normal; 12,787 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (360.89 ft / 354.33 ft) x 75.46 ft x (26.25 / 27.32 ft)
   (110.00 m / 108.00 m) x 23.00 m  x (8.00 / 8.33 m)

Armament:
      2 - 13.39" / 340 mm 30.0 cal guns - 1,102.31lbs / 500.00kg shells, 60 per gun
     Breech loading guns in turret on barbette mounts, 1890 Model
     2 x Single mounts on centreline ends, evenly spread
      16 - 5.51" / 140 mm 45.0 cal guns - 79.37lbs / 36.00kg shells, 125 per gun
     Breech loading guns in casemate mounts, 1890 Model
     16 x Single mounts on sides, evenly spread
      8 hull mounts in casemates- Limited use in heavy seas
      12 - 2.95" / 75.0 mm 45.0 cal guns - 13.23lbs / 6.00kg shells, 250 per gun
     Breech loading guns in deck mounts, 1890 Model
     12 x Single mounts on sides, evenly spread
      4 - 1.77" / 45.0 mm 45.0 cal guns - 2.76lbs / 1.25kg shells, 500 per gun
     Breech loading guns in deck mounts, 1885 Model
     4 x Single mounts on side ends, evenly spread
      Weight of broadside 3,644 lbs / 1,653 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.8" / 350 mm   206.07 ft / 62.81 m   12.30 ft / 3.75 m
   Ends:   5.91" / 150 mm   148.23 ft / 45.18 m   9.84 ft / 3.00 m
   Upper:   3.94" / 100 mm   206.07 ft / 62.81 m   8.20 ft / 2.50 m
     Main Belt covers 89 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.0" / 380 mm   9.84" / 250 mm      15.0" / 380 mm
   2nd:   3.94" / 100 mm   0.98" / 25 mm      3.94" / 100 mm
   3rd:   0.59" / 15 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 1.97" / 50 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 14.96" / 380 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 14,000 ihp / 10,444 Kw = 18.20 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 1,356 tons (100% coal)

Complement:
   579 - 753

Cost:
   £0.976 million / $3.902 million

Distribution of weights at normal displacement:
   Armament: 543 tons, 4.5 %
      - Guns: 543 tons, 4.5 %
   Armour: 4,088 tons, 33.6 %
      - Belts: 2,306 tons, 18.9 %
      - Armament: 977 tons, 8.0 %
      - Armour Deck: 635 tons, 5.2 %
      - Conning Tower: 171 tons, 1.4 %
   Machinery: 2,718 tons, 22.3 %
   Hull, fittings & equipment: 3,491 tons, 28.7 %
   Fuel, ammunition & stores: 1,184 tons, 9.7 %
   Miscellaneous weights: 160 tons, 1.3 %
      - Hull below water: 20 tons
      - Hull above water: 40 tons
      - On freeboard deck: 80 tons
      - Above deck: 20 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     15,328 lbs / 6,953 Kg = 12.8 x 13.4 " / 340 mm shells or 2.0 torpedoes
   Stability (Unstable if below 1.00): 1.45
   Metacentric height 6.2 ft / 1.9 m
   Roll period: 12.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.29
   Seaboat quality  (Average = 1.00): 1.49

Hull form characteristics:
   Hull has low quarterdeck ,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.608 / 0.613
   Length to Beam Ratio: 4.70 : 1
   'Natural speed' for length: 18.82 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   Bow angle (Positive = bow angles forward): -20.00 degrees
   Stern overhang: -8.20 ft / -2.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.92 %,  18.86 ft / 5.75 m,  18.86 ft / 5.75 m
      - Forward deck:   30.00 %,  18.86 ft / 5.75 m,  18.86 ft / 5.75 m
      - Aft deck:   28.16 %,  18.86 ft / 5.75 m,  18.86 ft / 5.75 m
      - Quarter deck:   20.92 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      16.98 ft / 5.17 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 89.5 %
      - Above water (accommodation/working, high = better): 122.2 %
   Waterplane Area: 19,697 Square feet or 1,830 Square metres
   Displacement factor (Displacement / loading): 104 %
   Structure weight / hull surface area: 133 lbs/sq ft or 649 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.89
      - Longitudinal: 2.94
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent 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 (20t)
----18t 12x350mm Torpedos (35 Pattern A)
----2t Additional Torpedo Handling Equipment
--Above Water (40t)
----30t Flag Facilities
----10t Construction Reserve
--On Deck (80t)
----30t Flag Facilties
----30t Additional Troop Acomidations
----20t Construction Reserve
--Above Deck (20t)
----15t Improved Aquisition Structures
----5t Additional Searchlights