Mine Warfare

[Guinness]

Information about Mine Warfare ships of Imperial Navy can be found here.

[Guinness]

Yanjingshe Class

(Purchasd from the Norse)

8 Ships
Yanjingshe 1-8 (ld 1900, refit 1910)

Yangingshe class, China minelayer laid down 1900

Displacement:
   609 t light; 625 t standard; 735 t normal; 823 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (220.96 ft / 220.00 ft) x 26.00 ft x (10.00 / 10.89 ft)
   (67.35 m / 67.06 m) x 7.92 m  x (3.05 / 3.32 m)

Armament:
      2 - 2.24" / 57.0 mm 45.0 cal guns - 5.71lbs / 2.59kg shells, 350 per gun
     Breech loading guns in deck mounts, 1900 Model
     2 x Single mounts on centreline ends, evenly spread
      Weight of broadside 11 lbs / 5 kg

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Direct drive, 1 shaft, 1,091 ihp / 814 Kw = 14.50 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 198 tons (90% coal)

Complement:
   69 - 91

Cost:
   £0.046 million / $0.182 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.3 %
      - Guns: 2 tons, 0.3 %
   Machinery: 169 tons, 23.0 %
   Hull, fittings & equipment: 233 tons, 31.6 %
   Fuel, ammunition & stores: 127 tons, 17.3 %
   Miscellaneous weights: 205 tons, 27.9 %
      - Hull below water: 10 tons
      - Hull above water: 10 tons
      - On freeboard deck: 150 tons
      - Above deck: 35 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,146 lbs / 520 Kg = 202.8 x 2.2 " / 57 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 0.8 ft / 0.2 m
   Roll period: 12.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.450 / 0.463
   Length to Beam Ratio: 8.46 : 1
   'Natural speed' for length: 14.83 kts
   Power going to wave formation at top speed: 39 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   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 %,  11.00 ft / 3.35 m,  10.00 ft / 3.05 m
      - Forward deck:   30.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Aft deck:   35.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Quarter deck:   15.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Average freeboard:      10.08 ft / 3.07 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 79.3 %
      - Above water (accommodation/working, high = better): 96.0 %
   Waterplane Area: 3,476 Square feet or 323 Square metres
   Displacement factor (Displacement / loading): 134 %
   Structure weight / hull surface area: 35 lbs/sq ft or 171 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.64
      - Overall: 1.00
   Excellent 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

- 10 tons for additional damage control and pumps (hull below water)
- 10 tons for climate control (hull above water)
- 150 tons for mines and mine handling gear (on freeboard deck)
- 10 tons for short range wireless (above deck)
- 25 tons for long range wireless (above deck)

[Guinness]

Maoyou Class

(Purchased from the Norse)

20 Ships
Maoyou 1-20 (ld 1905)

Maoyou class, China minesweeper laid down 1905

Displacement:
   98 t light; 101 t standard; 128 t normal; 149 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (80.57 ft / 80.00 ft) x 19.00 ft x (7.00 / 7.83 ft)
   (24.56 m / 24.38 m) x 5.79 m  x (2.13 / 2.39 m)

Armament:
      1 - 1.85" / 47.0 mm 50.0 cal gun - 3.35lbs / 1.52kg shells, 400 per gun
     Breech loading gun in deck and hoist mount, 1905 Model
     1 x Single mount on centreline forward
      Weight of broadside 3 lbs / 2 kg

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 272 shp / 203 Kw = 12.00 kts
   Range 2,000nm at 10.00 kts
   Bunker at max displacement = 48 tons (90% coal)

Complement:
   18 - 24

Cost:
   £0.007 million / $0.028 million

Distribution of weights at normal displacement:
   Armament: 1 tons, 1.0 %
      - Guns: 1 tons, 1.0 %
   Machinery: 22 tons, 17.5 %
   Hull, fittings & equipment: 34 tons, 26.8 %
   Fuel, ammunition & stores: 30 tons, 23.5 %
   Miscellaneous weights: 40 tons, 31.3 %
      - Hull below water: 10 tons
      - Hull above water: 10 tons
      - On freeboard deck: 10 tons
      - Above deck: 10 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     202 lbs / 92 Kg = 63.8 x 1.9 " / 47 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.26
   Metacentric height 0.6 ft / 0.2 m
   Roll period: 10.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.03
   Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.421 / 0.439
   Length to Beam Ratio: 4.21 : 1
   'Natural speed' for length: 8.94 kts
   Power going to wave formation at top speed: 64 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   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 %,  6.50 ft / 1.98 m,  6.00 ft / 1.83 m
      - Forward deck:   30.00 %,  6.00 ft / 1.83 m,  6.00 ft / 1.83 m
      - Aft deck:   35.00 %,  6.00 ft / 1.83 m,  6.00 ft / 1.83 m
      - Quarter deck:   15.00 %,  6.00 ft / 1.83 m,  6.00 ft / 1.83 m
      - Average freeboard:      6.04 ft / 1.84 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 78.0 %
      - Above water (accommodation/working, high = better): 57.1 %
   Waterplane Area: 899 Square feet or 84 Square metres
   Displacement factor (Displacement / loading): 144 %
   Structure weight / hull surface area: 23 lbs/sq ft or 111 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.81
      - Longitudinal: 6.14
      - Overall: 1.00
   Excellent 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

- 10 tons for additional damage control and pumps (hull below water)
- 10 tons for climate control (hull above water)
- 10 tons for mine sweeping gear (on freeboard deck)
- 10 tons for short range wireless (above deck)