Minewarfare

[Desertfox]

NSS Lake Eyre

Lake Eyre class, New Switzerland  Minelayer laid down 1908 (Engine 1909)

Displacement:
   1,770 t light; 1,862 t standard; 2,100 t normal; 2,291 t full load

Dimensions: Length overall / water x beam x draught
   350.00 ft / 350.00 ft x 40.00 ft x 10.50 ft (normal load)
   106.68 m / 106.68 m x 12.19 m  x 3.20 m

Armament:
      4 - 6.00" / 152 mm guns (2x2 guns), 108.00lbs / 48.99kg shells, 1908 Model
     Breech loading guns in deck mounts with hoists
     on centreline, evenly spread
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1908 Model
     Breech loading guns in deck mounts
     on side, evenly spread
      4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.89kg shells, 1908 Model
     Quick firing guns in deck mounts
     on side, evenly spread
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1908 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 568 lbs / 258 kg
   Shells per gun, main battery: 147

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

   - Armour deck: 1.50" / 38 mm, Conning tower: 3.00" / 76 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 7,564 shp / 5,643 Kw = 21.00 kts
   Range 5,700nm at 10.00 kts
   Bunker at max displacement = 429 tons (50% coal)

Complement:
   154 - 201

Cost:
   £0.172 million / $0.688 million

Distribution of weights at normal displacement:
   Armament: 71 tons, 3.4 %
   Armour: 281 tons, 13.4 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 12 tons, 0.6 %
      - Armour Deck: 259 tons, 12.3 %
      - Conning Tower: 11 tons, 0.5 %
   Machinery: 360 tons, 17.2 %
   Hull, fittings & equipment: 837 tons, 39.9 %
   Fuel, ammunition & stores: 330 tons, 15.7 %
   Miscellaneous weights: 220 tons, 10.5 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,812 lbs / 1,275 Kg = 26.0 x 6.0 " / 152 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.22
   Metacentric height 1.8 ft / 0.6 m
   Roll period: 12.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 67 %
         - Recoil effect (Restricted arc if above 1.00): 0.36
   Seaboat quality  (Average = 1.00): 1.16

Hull form characteristics:
   Hull has low quarterdeck
   Block coefficient: 0.500
   Length to Beam Ratio: 8.75 : 1
   'Natural speed' for length: 18.71 kts
   Power going to wave formation at top speed: 48 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   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:      15.00 ft / 4.57 m
      - Forecastle (20 %):   10.00 ft / 3.05 m
      - Mid (50 %):      10.00 ft / 3.05 m
      - Quarterdeck (25 %):   7.00 ft / 2.13 m (10.00 ft / 3.05 m before break)
      - Stern:      7.00 ft / 2.13 m
      - Average freeboard:   9.65 ft / 2.94 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 93.5 %
      - Above water (accommodation/working, high = better): 115.4 %
   Waterplane Area: 9,328 Square feet or 867 Square metres
   Displacement factor (Displacement / loading): 117 %
   Structure weight / hull surface area: 64 lbs/sq ft or 312 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.06
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is adequate