Cruisers Class 3

Walter · March 31, 2007, 01:00:15 PM

3rd Class Cruiser Size Comparison.

Top to bottom: Chiyoda, Akitsushima, Suma, Tsushima, Otowa.

Walter · March 31, 2007, 01:00:40 PM

Izumi, Japan Cruiser Class 3 laid down 1881
Redesignated as Coast Defense Ship Class 2 as of 1/1/1912.

Displacement:
   2,439 t light; 2,604 t standard; 3,023 t normal; 3,358 t full load

Dimensions: Length overall / water x beam x draught
   272.31 ft / 272.31 ft x 41.99 ft x 18.50 ft (normal load)
   83.00 m / 83.00 m x 12.80 m x 5.64 m

Armament:
2 - 10.00" / 254 mm guns in single mounts, 432.50lbs / 196.18kg shells, 1881 Model
    Breech loading guns in deck mounts with hoists
    on centreline ends, evenly spread
6 - 6.00" / 152 mm guns in single mounts, 93.42lbs / 42.37kg shells, 1881 Model
    Breech loading guns in casemate mounts
    on side, all amidships
2 - 3.00" / 76.2 mm guns in single mounts, 11.68lbs / 5.30kg shells, 1881 Model
    Quick firing guns in deck mounts
    on side, evenly spread
5 - 1.85" / 47.0 mm guns in single mounts, 2.74lbs / 1.24kg shells, 1881 Model
    Quick firing guns in deck mounts
    on side, evenly spread
   Weight of broadside 1,463 lbs / 663 kg
   Shells per gun, main battery: 120
   3 - 15.0" / 380 mm submerged torpedo tubes

Armour:

- Armour deck: 0.47" / 12 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 5,573 ihp / 4,157 Kw = 17.45 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 754 tons (100% coal)

Complement:
   203 - 264

Cost:
   £0.383 million / $1.534 million

Distribution of weights at normal displacement:
   Armament: 183 tons, 6.0 %
   Armour: 67 tons, 2.2 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 0 tons, 0.0 %
    - Armour Deck: 67 tons, 2.2 %
    - Conning Tower: 0 tons, 0.0 %
   Machinery: 1,032 tons, 34.2 %
   Hull, fittings & equipment: 1,107 tons, 36.6 %
   Fuel, ammunition & stores: 584 tons, 19.3 %
   Miscellaneous weights: 50 tons, 1.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    737 lbs / 334 Kg = 1.7 x 10.0 " / 254 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 1.6 ft / 0.5 m
   Roll period: 14.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.78
   Seaboat quality (Average = 1.00): 1.10

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.500
   Length to Beam Ratio: 6.48 : 1
   'Natural speed' for length: 16.50 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 91
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
    - Stem:      8.20 ft / 2.50 m
    - Forecastle (20 %):   8.20 ft / 2.50 m
    - Mid (50 %):      8.20 ft / 2.50 m
    - Quarterdeck (7 %):   8.20 ft / 2.50 m
    - Stern:      8.20 ft / 2.50 m
    - Average freeboard:   8.20 ft / 2.50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 171.2 %
      - Above water (accommodation/working, high = better): 58.6 %
   Waterplane Area: 7,619 Square feet or 708 Square metres
   Displacement factor (Displacement / loading): 78 %
   Structure weight / hull surface area: 94 lbs/sq ft or 459 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.16
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

Walter · March 31, 2007, 01:01:05 PM

Chiyoda, Japan Cruiser Class 3 laid down 1888
Redesignated as Coast Defense Ship Class 2 as of 1/1/1912.

Displacement:
   2,237 t light; 2,329 t standard; 2,642 t normal; 2,893 t full load

Dimensions: Length overall / water x beam x draught
   310.04 ft / 310.04 ft x 42.59 ft x 14.01 ft (normal load)
   94.50 m / 94.50 m x 12.98 m x 4.27 m

Armament:
10 - 4.72" / 120 mm guns in single mounts, 51.14lbs / 23.20kg shells, 1888 Model
    Breech loading guns in deck mounts with hoists
    on centreline ends, evenly spread
14 - 1.85" / 47.0 mm guns in single mounts, 3.07lbs / 1.39kg shells, 1888 Model
    Quick firing guns in deck mounts
    on side, all amidships
30 - 0.45" / 11.4 mm guns (3x10 guns), 0.04lbs / 0.02kg shells, 1888 Model
    Machine guns in deck mounts
    on side, evenly spread
   Weight of broadside 556 lbs / 252 kg
   Shells per gun, main battery: 120
   3 - 14.2" / 360 mm submerged torpedo tubes

Armour:
- Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.95" / 75 mm   272.31 ft / 83.00 m   7.84 ft / 2.39 m
   Ends:   Unarmoured
    Main Belt covers 135 % of normal length

- Armour deck: 0.98" / 25 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 4,563 ihp / 3,404 Kw = 17.45 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 565 tons (100% coal)

Complement:
   183 - 239

Cost:
   £0.255 million / $1.020 million

Distribution of weights at normal displacement:
   Armament: 69 tons, 2.6 %
   Armour: 414 tons, 15.7 %
    - Belts: 254 tons, 9.6 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 0 tons, 0.0 %
    - Armour Deck: 160 tons, 6.1 %
    - Conning Tower: 0 tons, 0.0 %
   Machinery: 846 tons, 32.0 %
   Hull, fittings & equipment: 858 tons, 32.5 %
   Fuel, ammunition & stores: 405 tons, 15.3 %
   Miscellaneous weights: 50 tons, 1.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    1,243 lbs / 564 Kg = 24.3 x 4.7 " / 120 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.12
   Metacentric height 1.7 ft / 0.5 m
   Roll period: 13.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.29
   Seaboat quality (Average = 1.00): 1.11

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.500
   Length to Beam Ratio: 7.28 : 1
   'Natural speed' for length: 17.61 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 95
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
    - Stem:      6.89 ft / 2.10 m
    - Forecastle (20 %):   6.89 ft / 2.10 m
    - Mid (50 %):      6.89 ft / 2.10 m
    - Quarterdeck (7 %):   6.89 ft / 2.10 m
    - Stern:      6.89 ft / 2.10 m
    - Average freeboard:   6.89 ft / 2.10 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 134.4 %
      - Above water (accommodation/working, high = better): 63.1 %
   Waterplane Area: 8,797 Square feet or 817 Square metres
   Displacement factor (Displacement / loading): 96 %
   Structure weight / hull surface area: 71 lbs/sq ft or 347 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.05
      - Longitudinal: 1.04
      - Overall: 1.04
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

Walter · March 31, 2007, 01:01:34 PM

Akitsushima, Japan Cruiser Class 3 laid down 1890
Redesignated as Coast Defense Ship Class 2 as of 1/1/1912.

Displacement:
   2,670 t light; 2,792 t standard; 3,245 t normal; 3,607 t full load

Dimensions: Length overall / water x beam x draught
   301.84 ft / 301.84 ft x 43.11 ft x 17.45 ft (normal load)
   92.00 m / 92.00 m x 13.14 m x 5.32 m

Armament:
4 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1890 Model
    Breech loading guns in deck mounts with hoists
    on centreline ends, evenly spread
6 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1890 Model
    Breech loading guns in casemate mounts
    on side, all amidships
8 - 1.85" / 47.0 mm guns in single mounts, 3.17lbs / 1.44kg shells, 1890 Model
    Quick firing guns in deck mounts
    on side, evenly spread
   Weight of broadside 774 lbs / 351 kg
   Shells per gun, main battery: 120
   4 - 14.2" / 360 mm submerged torpedo tubes

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.53" / 115 mm    -          -

- Armour deck: 2.95" / 75 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 5,467 ihp / 4,079 Kw = 17.75 kts
   Range 5,500nm at 10.00 kts
   Bunker at max displacement = 815 tons (100% coal)

Complement:
   214 - 279

Cost:
   £0.314 million / $1.257 million

Distribution of weights at normal displacement:
   Armament: 97 tons, 3.0 %
   Armour: 537 tons, 16.6 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 63 tons, 2.0 %
    - Armour Deck: 474 tons, 14.6 %
    - Conning Tower: 0 tons, 0.0 %
   Machinery: 997 tons, 30.7 %
   Hull, fittings & equipment: 989 tons, 30.5 %
   Fuel, ammunition & stores: 575 tons, 17.7 %
   Miscellaneous weights: 50 tons, 1.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    1,567 lbs / 711 Kg = 14.5 x 6.0 " / 152 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.15
   Metacentric height 1.8 ft / 0.6 m
   Roll period: 13.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.40
   Seaboat quality (Average = 1.00): 1.25

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.500
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 17.37 kts
   Power going to wave formation at top speed: 47 %
   Trim (Max stability = 0, Max steadiness = 100): 80
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
    - Stem:      8.69 ft / 2.65 m
    - Forecastle (20 %):   8.69 ft / 2.65 m
    - Mid (50 %):      8.69 ft / 2.65 m
    - Quarterdeck (7 %):   8.69 ft / 2.65 m
    - Stern:      8.69 ft / 2.65 m
    - Average freeboard:   8.69 ft / 2.65 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 135.9 %
      - Above water (accommodation/working, high = better): 67.1 %
   Waterplane Area: 8,670 Square feet or 805 Square metres
   Displacement factor (Displacement / loading): 96 %
   Structure weight / hull surface area: 75 lbs/sq ft or 368 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.59
      - Overall: 1.02
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Walter · March 31, 2007, 01:02:18 PM

Suma, Japan Cruiser Class 3 laid down 1892
Redesignated as Coast Defense Ship Class 2 as of 1/1/1917.

Ships: Suma, Akashi
Displacement:
   2,299 t light; 2,399 t standard; 2,687 t normal; 2,918 t full load

Dimensions: Length overall / water x beam x draught
   308.40 ft / 308.40 ft x 40.16 ft x 15.19 ft (normal load)
   94.00 m / 94.00 m x 12.24 m x 4.63 m

Armament:
2 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1892 Model
    Breech loading guns in deck mounts with hoists
    on centreline ends, evenly spread
6 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1892 Model
    Breech loading guns in casemate mounts
    on side, all amidships
10 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1892 Model
    Quick firing guns in deck mounts
    on side, evenly spread
4 - 1.85" / 47.0 mm guns in single mounts, 3.17lbs / 1.44kg shells, 1892 Model
    Quick firing guns in deck mounts
    on side, evenly spread
   Weight of broadside 602 lbs / 273 kg
   Shells per gun, main battery: 120
   2 - 15.0" / 380 mm submerged torpedo tubes

Armour:
- Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.53" / 115 mm    -          -

- Armour deck: 0.98" / 25 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 6,906 ihp / 5,152 Kw = 19.50 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 519 tons (100% coal)

Complement:
   186 - 242

Cost:
   £0.301 million / $1.203 million

Distribution of weights at normal displacement:
   Armament: 75 tons, 2.8 %
   Armour: 182 tons, 6.8 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 32 tons, 1.2 %
    - Armour Deck: 150 tons, 5.6 %
    - Conning Tower: 0 tons, 0.0 %
   Machinery: 1,122 tons, 41.7 %
   Hull, fittings & equipment: 870 tons, 32.4 %
   Fuel, ammunition & stores: 389 tons, 14.5 %
   Miscellaneous weights: 50 tons, 1.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
    1,029 lbs / 467 Kg = 9.5 x 6.0 " / 152 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.29
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 11.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.37
   Seaboat quality (Average = 1.00): 1.28

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.500
   Length to Beam Ratio: 7.68 : 1
   'Natural speed' for length: 17.56 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 78
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
    - Stem:      9.84 ft / 3.00 m
    - Forecastle (20 %):   9.84 ft / 3.00 m
    - Mid (50 %):      9.84 ft / 3.00 m
    - Quarterdeck (7 %):   9.84 ft / 3.00 m
    - Stern:      9.84 ft / 3.00 m
    - Average freeboard:   9.84 ft / 3.00 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 166.2 %
      - Above water (accommodation/working, high = better): 83.2 %
   Waterplane Area: 8,252 Square feet or 767 Square metres
   Displacement factor (Displacement / loading): 81 %
   Structure weight / hull surface area: 68 lbs/sq ft or 334 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.56
      - Overall: 1.02
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Walter · March 31, 2007, 01:02:41 PM

Nanigawa, Japan Light Cruiser laid down 1901

Ships: Nanigawa, Takachi, Unebi, Saien, Aso, Soya, Tsugaru, Suzuya, Yodo, Mogami, Chikuma, Hirado, Yahagi, Jigoku

Displacement:
2,380 t light; 2,476 t standard; 2,986 t normal; 3,394 t full load

Dimensions: Length overall / water x beam x draught
239.55 ft / 230.00 ft x 40.00 ft x 20.00 ft (normal load)
73.02 m / 70.10 m x 12.19 m x 6.10 m

Armament:
5 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1901 Model
Breech loading guns in deck mounts with hoists
on centreline ends, majority forward
8 - 4.10" / 104 mm guns in single mounts, 34.46lbs / 15.63kg shells, 1901 Model
Quick firing guns in deck mounts
on side, all amidships
Weight of broadside 588 lbs / 267 kg
Shells per gun, main battery: 100

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5.00" / 127 mm 179.50 ft / 54.71 m 7.59 ft / 2.31 m
Ends: 4.00" / 102 mm 50.48 ft / 15.39 m 7.59 ft / 2.31 m
Upper: 4.00" / 102 mm 159.50 ft / 48.62 m 8.00 ft / 2.44 m
Main Belt covers 120 % of normal length

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

- Armour deck: 0.50" / 13 mm, Conning tower: 5.00" / 127 mm

Machinery:
Coal fired boilers, steam turbines,
Direct drive, 2 shafts, 4,514 shp / 3,368 Kw = 16.50 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 918 tons (100% coal)

Complement:
201 - 262

Cost:
£0.269 million / $1.075 million

Distribution of weights at normal displacement:
Armament: 74 tons, 2.5 %
Armour: 694 tons, 23.2 %
- Belts: 566 tons, 19.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 45 tons, 1.5 %
- Armour Deck: 60 tons, 2.0 %
- Conning Tower: 22 tons, 0.7 %
Machinery: 884 tons, 29.6 %
Hull, fittings & equipment: 668 tons, 22.4 %
Fuel, ammunition & stores: 606 tons, 20.3 %
Miscellaneous weights: 60 tons, 2.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,962 lbs / 890 Kg = 31.4 x 5.0 " / 127 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.17
Metacentric height 1.7 ft / 0.5 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.32
Seaboat quality (Average = 1.00): 1.28

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.568
Length to Beam Ratio: 5.75 : 1
'Natural speed' for length: 15.17 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.00 ft / 5.49 m
- Forecastle (20 %): 10.62 ft / 3.24 m
- Mid (50 %): 10.62 ft / 3.24 m
- Quarterdeck (15 %): 10.62 ft / 3.24 m
- Stern: 10.62 ft / 3.24 m
- Average freeboard: 11.21 ft / 3.42 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 116.8 %
- Above water (accommodation/working, high = better): 65.7 %
Waterplane Area: 6,530 Square feet or 607 Square metres
Displacement factor (Displacement / loading): 95 %
Structure weight / hull surface area: 61 lbs/sq ft or 295 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 3.17
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped

Walter · October 19, 2008, 07:46:03 AM

Tsushima, Japan Cruiser Class 3 laid down 1901

Ships: Niitaka, Tsushima
Displacement:
   2,961 t light; 3,116 t standard; 3,403 t normal; 3,632 t full load

Dimensions: Length overall / water x beam x draught
   334.65 ft / 334.65 ft x 44.09 ft x 16.14 ft (normal load)
   102.00 m / 102.00 m x 13.44 m x 4.92 m

Armament:
6 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1901 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, evenly spread
10 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1901 Model
     Breech loading guns in casemate mounts
     on side, all amidships
4 - 1.85" / 47.0 mm guns in single mounts, 3.17lbs / 1.44kg shells, 1901 Model
     Quick firing guns in deck mounts
     on side, evenly spread
   Weight of broadside 1,188 lbs / 539 kg
   Shells per gun, main battery: 120
   2 - 15.0" / 380 mm submerged torpedo tubes

Armour:

- Armour deck: 2.64" / 67 mm, Conning tower: 3.94" / 100 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 8,583 ihp / 6,403 Kw = 20.00 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 517 tons (100% coal)

Complement:
   222 - 289

Cost:
   £0.399 million / $1.596 million

Distribution of weights at normal displacement:
   Armament: 148 tons, 4.4 %
   Armour: 499 tons, 14.7 %
     - Belts: 0 tons, 0.0 %
     - Torpedo bulkhead: 0 tons, 0.0 %
     - Armament: 0 tons, 0.0 %
     - Armour Deck: 480 tons, 14.1 %
     - Conning Tower: 19 tons, 0.6 %
   Machinery: 1,218 tons, 35.8 %
   Hull, fittings & equipment: 1,045 tons, 30.7 %
   Fuel, ammunition & stores: 442 tons, 13.0 %
   Miscellaneous weights: 50 tons, 1.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,249 lbs / 567 Kg = 11.6 x 6.0 " / 152 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 1.8 ft / 0.5 m
   Roll period: 13.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.53
   Seaboat quality (Average = 1.00): 1.09

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.500
   Length to Beam Ratio: 7.59 : 1
   'Natural speed' for length: 18.29 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 92
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
     - Stem:      8.69 ft / 2.65 m
     - Forecastle (20 %):   8.69 ft / 2.65 m
     - Mid (50 %):      8.69 ft / 2.65 m
     - Quarterdeck (7 %):   8.69 ft / 2.65 m
     - Stern:      8.69 ft / 2.65 m
     - Average freeboard:   8.69 ft / 2.65 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 156.8 %
      - Above water (accommodation/working, high = better): 73.3 %
   Waterplane Area: 9,832 Square feet or 913 Square metres
   Displacement factor (Displacement / loading): 78 %
   Structure weight / hull surface area: 73 lbs/sq ft or 355 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.01
      - Longitudinal: 1.34
      - Overall: 1.04
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

Walter · December 03, 2008, 09:58:17 AM

Otowa, Japan Cruiser Class 3 laid down 1903

Displacement:
2,661 t light; 2,766 t standard; 3,025 t normal; 3,233 t full load

Dimensions: Length overall / water x beam x draught
324.80 ft / 324.80 ft x 41.40 ft x 15.75 ft (normal load)
99.00 m / 99.00 m x 12.62 m x 4.80 m

Armament:
2 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1903 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread
6 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1903 Model
Breech loading guns in casemate mounts
on side, all amidships
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1903 Model
Quick firing guns in deck mounts
on side, evenly spread
Weight of broadside 586 lbs / 266 kg
Shells per gun, main battery: 120

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.46" / 37 mm - -

- Armour deck: 1.97" / 50 mm, Conning tower: 3.94" / 100 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 9,744 ihp / 7,269 Kw = 21.00 kts
Range 4,000nm at 10.00 kts
Bunker at max displacement = 466 tons (100% coal)

Complement:
203 - 265

Cost:
£0.339 million / $1.356 million

Distribution of weights at normal displacement:
Armament: 73 tons, 2.4 %
Armour: 354 tons, 11.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 10 tons, 0.3 %
- Armour Deck: 326 tons, 10.8 %
- Conning Tower: 18 tons, 0.6 %
Machinery: 1,316 tons, 43.5 %
Hull, fittings & equipment: 868 tons, 28.7 %
Fuel, ammunition & stores: 364 tons, 12.0 %
Miscellaneous weights: 50 tons, 1.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,176 lbs / 533 Kg = 10.9 x 6.0 " / 152 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 1.9 ft / 0.6 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0.32
Seaboat quality (Average = 1.00): 1.14

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.500
Length to Beam Ratio: 7.84 : 1
'Natural speed' for length: 18.02 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 87
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 9.84 ft / 3.00 m
- Forecastle (20 %): 9.84 ft / 3.00 m
- Mid (50 %): 9.84 ft / 3.00 m
- Quarterdeck (7 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 9.84 ft / 3.00 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 160.7 %
- Above water (accommodation/working, high = better): 82.8 %
Waterplane Area: 8,960 Square feet or 832 Square metres
Displacement factor (Displacement / loading): 78 %
Structure weight / hull surface area: 63 lbs/sq ft or 308 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.46
- Overall: 1.01
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform