Carriers

[Walter]

Tsurumi, Japan seaplane carrier laid down 1918 (Engine 1916)

Displacement:
   3,000 t light; 3,104 t standard; 3,762 t normal; 4,288 t full load

Dimensions: Length overall / water x beam x draught
   388.01 ft / 380.00 ft x 45.00 ft x 14.00 ft (normal load)
   118.26 m / 115.82 m x 13.72 m  x 4.27 m

Armament:
      4 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1918 Model
     Quick firing guns in deck mounts with hoists
     on side ends, evenly spread
      4 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1918 Model
     Quick firing guns in deck mounts with hoists
     on side, evenly spread
      8 - 1.00" / 25.4 mm guns (2x4 guns), 0.50lbs / 0.23kg shells, 1918 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
      20 - 0.45" / 11.4 mm guns (2x10 guns), 0.05lbs / 0.02kg shells, 1918 Model
     Machine guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 238 lbs / 108 kg
   Shells per gun, main battery: 200

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.50" / 64 mm   250.00 ft / 76.20 m   10.00 ft / 3.05 m
   Ends:   Unarmoured
     Main Belt covers 101% of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm         -               -
   2nd:   1.00" / 25 mm         -               -

   - Armour deck: 0.80" / 20 mm, Conning tower: 3.00" / 76 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 25,194 shp / 18,795 Kw = 26.00 kts
   Range 7,100nm at 15.00 kts
   Bunker at max displacement = 1,185 tons

Complement:
   239 - 312

Cost:
   £0.523 million / $2.092 million

Distribution of weights at normal displacement:
   Armament: 30 tons, 0.8%
   Armour: 471 tons, 12.5%
      - Belts: 264 tons, 7.0%
      - Torpedo bulkhead: 0 tons, 0.0%
      - Armament: 15 tons, 0.4%
      - Armour Deck: 177 tons, 4.7%
      - Conning Tower: 16 tons, 0.4%
   Machinery: 939 tons, 25.0%
   Hull, fittings & equipment: 1,191 tons, 31.6%
   Fuel, ammunition & stores: 762 tons, 20.2%
   Miscellaneous weights: 370 tons, 9.8%

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     4,543 lbs / 2,061 Kg = 86.2 x 4.7 " / 120 mm shells or 1.0 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 1.9 ft / 0.6 m
   Roll period: 13.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.15
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.550
   Length to Beam Ratio: 8.44 : 1
   'Natural speed' for length: 19.49 kts
   Power going to wave formation at top speed: 60 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      22.00 ft / 6.71 m
      - Forecastle (20%):   13.72 ft / 4.18 m
      - Mid (50%):      13.72 ft / 4.18 m
      - Quarterdeck (15%):   13.72 ft / 4.18 m
      - Stern:      13.72 ft / 4.18 m
      - Average freeboard:   14.38 ft / 4.38 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 98.4%
      - Above water (accommodation/working, high = better): 130.5%
   Waterplane Area: 11,934 Square feet or 1,109 Square metres
   Displacement factor (Displacement / loading): 127%
   Structure weight / hull surface area: 65 lbs/sq ft or 315 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.47
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform


100 tons ---- Fire Control
50 tons ----- Radar and Remote-Hearing Devices
25 tons ----- Long Range Wireless
25 tons ----- Backup Long Range Wireless
10 tons ----- Backup Short Range Wireless
10 tons ----- Climatization
10 tons ----- Extra Generators
100 tons ---- 4 Planes
10 tons ----- Crane
10 tons ----- Extra Pumps
4 tons ------ 1600 extra 57mm rounds (total 600 per gun)
1.5 tons ---- 6600 extra 1" rounds (total 1025 per gun)
0.5 tons ---- 25400 extra 0.45" rounds (total 12900 rounds per gattling)
14 tons ----- Reserve.
370 tons total