Coastal-patrol and mine boat

[ledeper]

Numeral(Cms 01-Cms99), Bcs Coastal-patrol and mine boat  laid down 1913

Displacement:
   369 t light; 388 t standard; 447 t normal; 495 t full load

Dimensions: Length overall / water x beam x draught
   182,76 ft / 180,45 ft x 29,53 ft x 5,41 ft (normal load)
   55,71 m / 55,00 m x 9,00 m  x 1,65 m

Armament:
      2 - 3,94" / 100 mm guns in single mounts, 30,51lbs / 13,84kg shells, 1913 Model
     Quick firing guns in deck mounts
     on centreline, all forward, 1 raised mount
      2 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,88kg shells, 1913 Model
     Quick firing guns in deck mounts
     on side, all amidships
   Weight of broadside 65 lbs / 29 kg
   Shells per gun, main battery: 250

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 1 shaft, 2.234 shp / 1.666 Kw = 18,00 kts
   Range 3.500nm at 10,00 kts
   Bunker at max displacement = 108 tons (100% coal)

Complement:
   48 - 63

Cost:
   £0,036 million / $0,145 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 1,8 %
   Machinery: 96 tons, 21,5 %
   Hull, fittings & equipment: 195 tons, 43,6 %
   Fuel, ammunition & stores: 78 tons, 17,5 %
   Miscellaneous weights: 70 tons, 15,6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     804 lbs / 365 Kg = 26,3 x 3,9 " / 100 mm shells or 0,5 torpedoes
   Stability (Unstable if below 1.00): 1,25
   Metacentric height 1,2 ft / 0,4 m
   Roll period: 11,3 seconds
   Steadiness   - As gun platform (Average = 50 %): 56 %
         - Recoil effect (Restricted arc if above 1.00): 0,10
   Seaboat quality  (Average = 1.00): 1,12

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,543
   Length to Beam Ratio: 6,11 : 1
   'Natural speed' for length: 13,43 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10,00 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 %):   10,30 ft / 3,14 m
      - Mid (50 %):      10,30 ft / 3,14 m
      - Quarterdeck (15 %):   10,30 ft / 3,14 m
      - Stern:      10,30 ft / 3,14 m
      - Average freeboard:   10,53 ft / 3,21 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 102,0 %
      - Above water (accommodation/working, high = better): 146,3 %
   Waterplane Area: 3.578 Square feet or 332 Square metres
   Displacement factor (Displacement / loading): 137 %
   Structure weight / hull surface area: 36 lbs/sq ft or 175 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,88
      - Longitudinal: 3,11
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

W/L 10t
Mines 50 t
Sweeping Gear 10t