Light Cruisers (軽巡洋艦)

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Naniwa Class (浪速型) Cruiser

The Naniwa class are the oldest cruisers still in active service with the Japanese Navy. Their high number and flexibility leads them as to be the workhorse of the Japanese Navy and are typically the ships used to show the flag in minor colonial settlements and patrol trade waters.

Having been 16 years since the first were built, there has been some talk in the Imperial Court about replacing these ships. In the meantime, the ships are still capable, and sail the great seas.

01 - Naniwa (浪速), laid down 1884
02 - Takachiho (高千穂), laid down 1884
03 - Izumi (和泉), laid down 1884
04 - Chiyoda (千代田), laid down 1884
05 - Asama (浅間), laid down 1884
06 - Tokiwa (常盤), laid down 1884
07 - Izumo (出雲), laid down 1884
08 - Iwate (磐手), laid down 1884
09 - Yakumo (八雲), laid down 1885
10 - Matsushima (松島), laid down 1885

11 - Itsukushima (厳島), laid down 1885
12 - Hashidate (橋立), laid down 1885
13 - Akitsushima (秋津洲), laid down 1885
14 - Yoshino (吉野), laid down 1885
15 - Suma (須磨), laid down 1885
16- Akashi (明石), laid down 1885

Naniwa, Japan Cruiser laid down 1884 (Engine 1890)

Displacement:
   3,500 t light; 3,869 t standard; 4,790 t normal; 5,527 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (299.87 ft / 299.87 ft) x 45.93 ft x (21.00 / 23.61 ft)
   (91.40 m / 91.40 m) x 14.00 m  x (6.40 / 7.20 m)

Armament:
      2 - 10.24" / 260 mm 35.0 cal guns - 479.68lbs / 217.58kg shells, 200 per gun
     Breech loading guns in casemate mounts, 1884 Model
     2 x Twin mounts on centreline ends, evenly spread
      6 - 5.98" / 152 mm 35.0 cal guns - 95.83lbs / 43.47kg shells, 450 per gun
     Quick firing guns in casemate mounts, 1884 Model
     6 x Single mounts on sides, evenly spread
      6 - 2.24" / 57.0 mm 40.0 cal guns - 6.00lbs / 2.72kg shells, 600 per gun
     Quick firing guns in deck mounts, 1884 Model
     6 x Single mounts on sides, evenly spread
      40 - 1.00" / 25.4 mm 35.0 cal guns - 0.44lbs / 0.20kg shells, 1,000 per gun
     Machine guns in deck mounts, 1884 Model
     10 x Quad mounts on sides, evenly spread
      40 - 0.43" / 11.0 mm 35.0 cal guns - 0.04lbs / 0.02kg shells, 1,000 per gun
     Breech loading guns in deck mounts, 1884 Model
     4 x 2 row decuple mounts on sides, evenly spread
      Weight of broadside 1,590 lbs / 721 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.46" / 37 mm   0.98" / 25 mm      0.98" / 25 mm
   2nd:   1.46" / 37 mm   0.98" / 25 mm      0.98" / 25 mm
   3rd:   0.55" / 14 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 2.95" / 75 mm
   Forecastle: 1.97" / 50 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 1.46" / 37 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 8,491 ihp / 6,334 Kw = 18.50 kts
   Range 9,000nm at 10.00 kts
   Bunker at max displacement = 1,658 tons (100% coal)

Complement:
   287 - 374

Cost:
   £0.402 million / $1.607 million

Distribution of weights at normal displacement:
   Armament: 165 tons, 3.4 %
      - Guns: 165 tons, 3.4 %
   Armour: 573 tons, 12.0 %
      - Armament: 54 tons, 1.1 %
      - Armour Deck: 511 tons, 10.7 %
      - Conning Tower: 9 tons, 0.2 %
   Machinery: 1,572 tons, 32.8 %
   Hull, fittings & equipment: 1,189 tons, 24.8 %
   Fuel, ammunition & stores: 1,290 tons, 26.9 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,147 lbs / 1,428 Kg = 6.4 x 10.2 " / 260 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.81
   Metacentric height 4.1 ft / 1.2 m
   Roll period: 9.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.21
   Seaboat quality  (Average = 1.00): 1.35

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.580 / 0.595
   Length to Beam Ratio: 6.53 : 1
   'Natural speed' for length: 17.32 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 52
   Bow angle (Positive = bow angles forward): -5.00 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 %,  16.40 ft / 5.00 m,  13.12 ft / 4.00 m
      - Forward deck:   35.00 %,  13.12 ft / 4.00 m,  9.84 ft / 3.00 m
      - Aft deck:   30.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   15.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      11.34 ft / 3.46 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 123.0 %
      - Above water (accommodation/working, high = better): 70.4 %
   Waterplane Area: 9,884 Square feet or 918 Square metres
   Displacement factor (Displacement / loading): 112 %
   Structure weight / hull surface area: 81 lbs/sq ft or 397 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.22
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

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Takasogo Class (高砂型) Cruiser

Originally known under the codename KJ3000, the Takasogo (高砂) class was a effort to replace the aging Naniwa (浪速) class with a modern design. To this effect many of the superfluous tertiary guns have been removed and the total displacement lowered. As the Court was carrying out a intensive program of economic investment and development, funding for the ships has been scarce.

「ＫＪ３０００」は高砂型のもともとの名前。浪速型を置き換えるために設計されました。余分銃の多くが削除されてとへんいがていかする。高砂型艦のための資金が不足していますなぜならは政府は経済投資と開発の集中的なプログラムを実施したため。

01 - Takasogo (高砂), laid 1900
02 - Kasagi (笠置), laid 1900
03 - Chitose (千歳), laid 1902
04 - Niitaka (新高), laid 1903

Takasogo (高砂), Japan Cruiser laid down 1900

Displacement:
   3,000 t light; 3,132 t standard; 3,806 t normal; 4,345 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.70 ft / 393.70 ft) x 39.70 ft x (17.06 / 18.87 ft)
   (120.00 m / 120.00 m) x 12.10 m  x (5.20 / 5.75 m)

Armament:
      2 - 7.87" / 200 mm 45.0 cal guns - 242.51lbs / 110.00kg shells, 60 per gun
     Breech loading guns in deck and hoist mounts, 1900 Model
     2 x Single mounts on centreline ends, evenly spread
      4 - 5.98" / 152 mm 45.0 cal guns - 108.07lbs / 49.02kg shells, 150 per gun
     Quick firing guns in deck and hoist mounts, 1900 Model
     4 x Single mounts on centreline, evenly spread
      2 raised mounts
      4 - 2.24" / 57.0 mm 40.0 cal guns - 5.51lbs / 2.50kg shells, 300 per gun
     Quick firing guns in deck mounts, 1898 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 939 lbs / 426 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.50" / 38 mm   0.51" / 13 mm      0.51" / 13 mm
   2nd:   1.50" / 38 mm   0.51" / 13 mm      0.51" / 13 mm
   3rd:   0.51" / 13 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.95" / 75 mm
   Forecastle: 1.97" / 50 mm  Quarter deck: 1.97" / 50 mm

   - Conning towers: Forward 1.50" / 38 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 5,269 ihp / 3,931 Kw = 17.50 kts
   Range 9,000nm at 10.00 kts
   Bunker at max displacement = 1,213 tons (90% coal)

Complement:
   241 - 314

Cost:
   £0.307 million / $1.229 million

Distribution of weights at normal displacement:
   Armament: 247 tons, 6.5 %
      - Guns: 247 tons, 6.5 %
   Armour: 582 tons, 15.3 %
      - Armament: 36 tons, 1.0 %
      - Armour Deck: 538 tons, 14.1 %
      - Conning Tower: 8 tons, 0.2 %
   Machinery: 815 tons, 21.4 %
   Hull, fittings & equipment: 1,169 tons, 30.7 %
   Fuel, ammunition & stores: 806 tons, 21.2 %
   Miscellaneous weights: 187 tons, 4.9 %
      - On freeboard deck: 12 tons
      - Above deck: 175 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     4,299 lbs / 1,950 Kg = 17.6 x 7.9 " / 200 mm shells or 1.0 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 1.5 ft / 0.4 m
   Roll period: 13.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.91
   Seaboat quality  (Average = 1.00): 1.51

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.500 / 0.516
   Length to Beam Ratio: 9.92 : 1
   'Natural speed' for length: 19.84 kts
   Power going to wave formation at top speed: 35 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   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 %,  16.40 ft / 5.00 m,  14.76 ft / 4.50 m
      - Forward deck:   35.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
      - Aft deck:   30.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   15.00 %,  9.84 ft / 3.00 m,  11.48 ft / 3.50 m
      - Average freeboard:      12.80 ft / 3.90 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 90.8 %
      - Above water (accommodation/working, high = better): 102.8 %
   Waterplane Area: 10,409 Square feet or 967 Square metres
   Displacement factor (Displacement / loading): 118 %
   Structure weight / hull surface area: 74 lbs/sq ft or 361 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.55
      - Overall: 1.00
   Adequate 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

Above Deck: 175 t
- 25t, Long-Range Wireless
- 150t, Reserve Weight

On Deck: 12 t
- 6t, 2 x 45cm single TTs with two reloads each
- 6t, Reserve Weight