Jeanne d'Arc class Large Armored Cruiser

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One Ship
--IRS Jeanne d'Arc

Jeanne d'Arc, Imperial Roman Large Armored Cruiser laid down 1914

Displacement:
   28,000 t light; 29,490 t standard; 31,670 t normal; 33,414 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (702.12 ft / 685.70 ft) x 101.71 ft x (28.54 / 29.79 ft)
   (214.00 m / 209.00 m) x 31.00 m  x (8.70 / 9.08 m)

Armament:
      8 - 13.39" / 340 mm 45.0 cal guns - 1,212.54lbs / 550.00kg shells, 110 per gun
     Breech loading guns in turret on barbette mounts, 1909 Model
     2 x Quad mounts on centreline ends, evenly spread
      20 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 175 per gun
     Quick firing guns in casemate mounts, 1909 Model
     16 x Single mounts on sides, aft evenly spread
     4 x Single mounts on sides, forward evenly spread
      4 hull mounts in casemates- Limited use in heavy seas
      16 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 350 per gun
     Quick firing guns in deck and hoist mounts, 1906 Model
     8 x Twin mounts on sides, aft evenly spread
      8 raised mounts
      4 - 1.77" / 45.0 mm 50.0 cal guns - 3.31lbs / 1.50kg shells, 120 per gun
     Anti-air guns in deck mounts, 1911 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      10 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 10,000 per gun
     Machine guns in deck mounts, 1911 Model
     10 x Single mounts on sides, evenly spread
      10 raised mounts
      Weight of broadside 11,927 lbs / 5,410 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   9.45" / 240 mm   445.70 ft / 135.85 m   18.04 ft / 5.50 m
   Ends:   1.97" / 50 mm   239.96 ft / 73.14 m   9.84 ft / 3.00 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.57" / 40 mm   445.70 ft / 135.85 m   28.54 ft / 8.70 m
   Beam between torpedo bulkheads 88.58 ft / 27.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   13.4" / 340 mm   7.09" / 180 mm      11.0" / 280 mm
   2nd:   3.94" / 100 mm   0.98" / 25 mm      3.94" / 100 mm
   3rd:   0.59" / 15 mm   0.20" / 5 mm      0.79" / 20 mm
   4th:   0.20" / 5 mm         -               -
   5th:   0.20" / 5 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.36" / 60 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 9.45" / 240 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 128,000 shp / 95,488 Kw = 29.55 kts
   Range 7,000nm at 14.00 kts
   Bunker at max displacement = 3,923 tons

Complement:
   1,186 - 1,543

Cost:
   £3.470 million / $13.879 million

Distribution of weights at normal displacement:
   Armament: 2,159 tons, 6.8 %
      - Guns: 2,159 tons, 6.8 %
   Armour: 7,974 tons, 25.2 %
      - Belts: 3,443 tons, 10.9 %
      - Torpedo bulkhead: 741 tons, 2.3 %
      - Armament: 1,662 tons, 5.2 %
      - Armour Deck: 1,924 tons, 6.1 %
      - Conning Tower: 204 tons, 0.6 %
   Machinery: 4,931 tons, 15.6 %
   Hull, fittings & equipment: 10,995 tons, 34.7 %
   Fuel, ammunition & stores: 3,670 tons, 11.6 %
   Miscellaneous weights: 1,940 tons, 6.1 %
      - Hull below water: 1,350 tons
      - Hull above water: 150 tons
      - On freeboard deck: 400 tons
      - Above deck: 40 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     40,339 lbs / 18,297 Kg = 33.6 x 13.4 " / 340 mm shells or 5.6 torpedoes
   Stability (Unstable if below 1.00): 1.28
   Metacentric height 8.0 ft / 2.4 m
   Roll period: 15.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.41
   Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.557 / 0.563
   Length to Beam Ratio: 6.74 : 1
   'Natural speed' for length: 26.19 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 62
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 5.97 ft / 1.82 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Forward deck:   15.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Aft deck:   50.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Quarter deck:   15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      22.84 ft / 6.96 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 99.6 %
      - Above water (accommodation/working, high = better): 171.3 %
   Waterplane Area: 48,991 Square feet or 4,551 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 175 lbs/sq ft or 854 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.53
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Quarter deck armor represents a 25mm armored deck and an additional 35t of armor protection for stearing gear rather than a uniform 35mm armored deck.

Misc Distribution
--Below Water (1350t)
----1235t Electric Drives
----40t Additional Pumps
----35t Enhanced Subdivision
----20t Enhanced Damage Control Equipment
----20t Enhanced Ventilation and Crew Comfort
--Above Water (150t)
----50t Improved Officer Accommodations
----50t Improved Crew Accommodations
----20t Enhanced Ventilation and Crew Comfort
----20t Short-Range Wireless (x2)
----10t Construction Reserve
--On Deck (400t)
----216t 1912 Fire Control
----60t Flag Facilities
----20t Admiralty Accommodations
----50t Long-Range Wireless (x2)
----20t Enhanced Ventilation and Crew Comfort
----20t Night Fighting Equipment
----14t Construction Reserve
--Above Deck (40t)
----20t Improved Aquisition Structures
----10t Night Fighting Equipment
----10t Improved Signaling Equipment

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In 1921H2, IRS Jeanne d'Arc received an upgrade to 1918 Fire Control.