Protected Cruisers

[Darman]

List of Commissioned Protected Cruisers

Yoshino-class (1892)
       Yoshino
       Nara
       Kashiba
       Uda
       Ikoma
       Sakurai
Suma-class (1896)
       Suma
       Akashi
       Tamba

[Darman]

Yoshino, Empire of Japan Protected Cruiser laid down 1892

Displacement:
   4,100 t light; 4,375 t standard; 5,000 t normal; 5,501 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (360.00 ft / 360.00 ft) x 46.50 ft x (17.00 / 18.41 ft)
   (109.73 m / 109.73 m) x 14.17 m  x (5.18 / 5.61 m)

Armament:
      4 - 6.00" / 152 mm 40.0 cal guns - 103.51lbs / 46.95kg shells, 250 per gun
     Breech loading guns in deck mounts, 1892 Model
     2 x Single mounts on centreline ends, evenly spread
     2 x Single mounts on sides, forward deck forward
      8 - 4.70" / 119 mm 45.0 cal guns - 52.35lbs / 23.75kg shells, 500 per gun
     Quick firing guns in casemate mounts, 1892 Model
     8 x Single mounts on sides, evenly spread
      Weight of broadside 833 lbs / 378 kg
      1 - 18.0" / 457 mm, 12.00 ft / 3.66 m torpedo - 0.334 t total
   In a submerged bow tube
      4 - 18.0" / 457 mm, 12.00 ft / 3.66 m torpedoes - 0.334 t each, 1.336 t total
   In 4 sets of submerged side tubes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Ends:   Unarmoured
   Upper:   1.75" / 44 mm   234.00 ft / 71.32 m   5.00 ft / 1.52 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.00" / 102 mm         -               -
   2nd:   2.00" / 51 mm         -               -

   - Armoured deck - single deck: 0.50" / 13 mm For and Aft decks
   Forecastle: 0.50" / 13 mm  Quarter deck: 0.50" / 13 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 13,401 ihp / 9,997 Kw = 21.00 kts
   Range 6,000nm at 10.00 kts
   Bunker at max displacement = 1,125 tons (100% coal)

Complement:
   296 - 386

Cost:
   £0.516 million / $2.064 million

Distribution of weights at normal displacement:
   Armament: 130 tons, 2.6 %
      - Guns: 128 tons, 2.6 %
      - Torpedoes: 2 tons, 0.0 %
   Armour: 274 tons, 5.5 %
      - Belts: 87 tons, 1.7 %
      - Armament: 72 tons, 1.4 %
      - Armour Deck: 116 tons, 2.3 %
   Machinery: 2,393 tons, 47.9 %
   Hull, fittings & equipment: 1,293 tons, 25.8 %
   Fuel, ammunition & stores: 901 tons, 18.0 %
   Miscellaneous weights: 10 tons, 0.2 %
      - Hull below water: 10 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,382 lbs / 1,080 Kg = 22.1 x 6.0 " / 152 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.89
   Metacentric height 4.4 ft / 1.3 m
   Roll period: 9.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 72 %
         - Recoil effect (Restricted arc if above 1.00): 0.13
   Seaboat quality  (Average = 1.00): 1.44

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.615 / 0.625
   Length to Beam Ratio: 7.74 : 1
   'Natural speed' for length: 18.97 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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 %,  17.00 ft / 5.18 m,  13.28 ft / 4.05 m
      - Forward deck:   30.00 %,  13.28 ft / 4.05 m,  13.28 ft / 4.05 m
      - Aft deck:   35.00 %,  13.28 ft / 4.05 m,  13.28 ft / 4.05 m
      - Quarter deck:   15.00 %,  13.28 ft / 4.05 m,  13.28 ft / 4.05 m
      - Average freeboard:      13.58 ft / 4.14 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 167.3 %
      - Above water (accommodation/working, high = better): 106.1 %
   Waterplane Area: 12,416 Square feet or 1,153 Square metres
   Displacement factor (Displacement / loading): 92 %
   Structure weight / hull surface area: 72 lbs/sq ft or 351 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.55
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Misc. Weight:
4t below waterline for submerged broadside torpedo tubes.
1t below waterline for submerged bow torpedo tube.
5t below waterline for torpedo reloads. 

Ranges:
@10 knots: 6,000nm
@12 knots: 3,900nm
@14 knots: 2,700nm
@16 knots: 1,900nm
@18 knots: 1,375nm
@20 knots: 1,000nm

Edit: changed the breech loading 4.7" guns to QF 4.7" guns

[Darman]

Suma, Empire of Japan Protected Cruiser laid down 1896

Displacement:
   3,469 t light; 3,613 t standard; 4,003 t normal; 4,314 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (307.00 ft / 307.00 ft) x 41.00 ft x (15.00 / 16.04 ft)
   (93.57 m / 93.57 m) x 12.50 m  x (4.57 / 4.89 m)

Armament:
      2 - 6.00" / 152 mm 40.0 cal guns - 103.51lbs / 46.95kg shells, 250 per gun
     Breech loading guns in deck mounts, 1896 Model
     1 x Single mount on centreline, forward deck forward
     1 x Single mount on centreline, aft deck aft
      6 - 4.70" / 119 mm 45.0 cal guns - 52.35lbs / 23.75kg shells, 150 per gun
     Breech loading guns in deck mounts, 1896 Model
     6 x Single mounts on sides amidships
      6 raised mounts
      10 - 1.85" / 47.0 mm 45.0 cal guns - 3.19lbs / 1.45kg shells, 500 per gun
     Quick firing guns in deck mounts, 1896 Model
     8 x Single mounts on sides amidships
      8 raised mounts
     2 x Single mounts on centreline ends, evenly spread
      2 raised mounts
      Weight of broadside 553 lbs / 251 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Ends:   Unarmoured
   Upper:   1.75" / 44 mm   199.55 ft / 60.82 m   5.00 ft / 1.52 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.50" / 114 mm   1.00" / 25 mm            -

   - Armoured deck - single deck: 1.00" / 25 mm For and Aft decks
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 13,227 ihp / 9,867 Kw = 21.00 kts
   Range 4,500nm at 10.00 kts
   Bunker at max displacement = 701 tons (100% coal)

Complement:
   251 - 327

Cost:
   £0.443 million / $1.771 million

Distribution of weights at normal displacement:
   Armament: 83 tons, 2.1 %
   Armour: 293 tons, 7.3 %
      - Belts: 76 tons, 1.9 %
      - Armament: 22 tons, 0.5 %
      - Armour Deck: 195 tons, 4.9 %
   Machinery: 2,113 tons, 52.8 %
   Hull, fittings & equipment: 975 tons, 24.4 %
   Fuel, ammunition & stores: 534 tons, 13.3 %
   Miscellaneous weights: 4 tons, 0.1 %
      - Hull above water: 2 tons
      - On freeboard deck: 2 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,660 lbs / 753 Kg = 15.4 x 6.0 " / 152 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.83
   Metacentric height 3.5 ft / 1.1 m
   Roll period: 9.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 52 %
         - Recoil effect (Restricted arc if above 1.00): 0.14
   Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.742 / 0.748
   Length to Beam Ratio: 7.49 : 1
   'Natural speed' for length: 17.52 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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 %,  12.50 ft / 3.81 m,  12.50 ft / 3.81 m
      - Forward deck:   30.00 %,  12.50 ft / 3.81 m,  12.50 ft / 3.81 m
      - Aft deck:   35.00 %,  12.50 ft / 3.81 m,  12.50 ft / 3.81 m
      - Quarter deck:   15.00 %,  12.50 ft / 3.81 m,  12.50 ft / 3.81 m
      - Average freeboard:      12.50 ft / 3.81 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 177.5 %
      - Above water (accommodation/working, high = better): 99.3 %
   Waterplane Area: 10,469 Square feet or 973 Square metres
   Displacement factor (Displacement / loading): 81 %
   Structure weight / hull surface area: 65 lbs/sq ft or 318 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.00
      - Longitudinal: 1.64
      - Overall: 1.05
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate

Deck-mounted torpedo tubes located forward

Misc. Weight:
2t on deck for deck-mounted torpedo tubes.
2t in hull above waterline for torpedo reloads. 

Ranges:
@10 knots: 4,500nm
@12 knots: 2,900nm
@14 knots: 1,950nm
@16 knots: 1,340nm
@18 knots: 950nm
@20 knots: 680nm