Minelayers

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Amur, Japan Minelayer laid down 1898 Martial Class

Displacement:
   2,383 t light; 2,463 t standard; 2,834 t normal; 3,132 t full load

Dimensions: Length overall / water x beam x draught
   321.52 ft / 321.52 ft x 45.93 ft x 12.80 ft (normal load)
   98.00 m / 98.00 m x 14.00 m  x 3.90 m

Armament:
      4 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.92kg shells, 1898 Model
     Breech loading guns in deck mounts with hoists
     on side, evenly spread
     Aft Main mounts separated by engine room
      4 - 2.99" / 76.0 mm guns in single mounts, 13.39lbs / 6.08kg shells, 1898 Model
     Breech loading guns in deck mounts
     on side, evenly spread
   Weight of broadside 264 lbs / 120 kg
   Shells per gun, main battery: 150

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 7,982 ihp / 5,954 Kw = 20.00 kts
   Range 3,000nm at 13.00 kts
   Bunker at max displacement = 669 tons (100% coal)

Complement:
   193 - 252

Cost:
   £0.289 million / $1.154 million

Distribution of weights at normal displacement:
   Armament: 33 tons, 1.2 %
   Machinery: 1,267 tons, 44.7 %
   Hull, fittings & equipment: 982 tons, 34.7 %
   Fuel, ammunition & stores: 452 tons, 15.9 %
   Miscellaneous weights: 100 tons, 3.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,731 lbs / 785 Kg = 32.8 x 4.7 " / 120 mm shells or 0.5 torpedoes
   Stability (Unstable if below 1.00): 1.68
   Metacentric height 3.7 ft / 1.1 m
   Roll period: 10.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.10
   Seaboat quality  (Average = 1.00): 1.56

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.525
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 17.93 kts
   Power going to wave formation at top speed: 52 %
   Trim (Max stability = 0, Max steadiness = 100): 45
   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:      13.12 ft / 4.00 m
      - Forecastle (20 %):   13.12 ft / 4.00 m
      - Mid (50 %):      13.12 ft / 4.00 m
      - Quarterdeck (15 %):   13.12 ft / 4.00 m
      - Stern:      13.12 ft / 4.00 m
      - Average freeboard:   13.12 ft / 4.00 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 157.4 %
      - Above water (accommodation/working, high = better): 130.4 %
   Waterplane Area: 10,069 Square feet or 935 Square metres
   Displacement factor (Displacement / loading): 96 %
   Structure weight / hull surface area: 66 lbs/sq ft or 323 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.01
      - Longitudinal: 1.82
      - Overall: 1.07
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Ships:
Wu Li (Martial Power)