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Siren, Ancrath DDL laid down 1941

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  1. Siren, Ancrath DDL laid down 1941
  2.  
  3. Displacement:
  4.     4,685 t light; 4,999 t standard; 5,786 t normal; 6,415 t full load
  5.  
  6. Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
  7.     (487.08 ft / 475.07 ft) x 52.49 ft x (18.04 / 19.38 ft)
  8.     (148.46 m / 144.80 m) x 16.00 m  x (5.50 / 5.91 m)
  9.  
  10. Armament:
  11.       10 - 5.51" / 140 mm 40.0 cal guns - 83.78lbs / 38.00kg shells, 300 per gun
  12.       Dual purpose guns in deck and hoist mounts, 1938 Model
  13.       3 x 2-gun mounts on centreline, forward deck forward
  14.         1 raised mount - superfiring
  15.       2 x 2-gun mounts on centreline, aft deck aft
  16.         1 raised mount aft - superfiring
  17.       6 - 2.56" / 65.0 mm 45.0 cal guns - 9.04lbs / 4.10kg shells, 1,200 per gun
  18.       Anti-air guns in deck mounts, 1938 Model
  19.       2 x Twin mounts on sides, aft deck forward
  20.       1 x Twin mount on centreline, aft deck aft
  21.       12 - 1.18" / 30.0 mm 80.0 cal guns - 0.84lbs / 0.38kg shells, 4,000 per gun
  22.       Anti-air guns in deck mounts, 1938 Model
  23.       6 x Twin mounts on sides, evenly spread
  24.       Weight of broadside 902 lbs / 409 kg
  25.  
  26. Armour:
  27.    - Belts:     Width (max) Length (avg)        Height (avg)
  28.     Main:   3.15" / 80 mm   348.43 ft / 106.20 m    8.69 ft / 2.65 m
  29.     Ends:   Unarmoured
  30.       Main Belt covers 113 % of normal length
  31.  
  32.    - Torpedo Bulkhead - Strengthened structural bulkheads:
  33.         1.57" / 40 mm   348.43 ft / 106.20 m    14.80 ft / 4.51 m
  34.     Beam between torpedo bulkheads 42.65 ft / 13.00 m
  35.  
  36.    - Gun armour:    Face (max)  Other gunhouse (avg)    Barbette/hoist (max)
  37.     Main:   1.97" / 50 mm   1.97" / 50 mm       3.15" / 80 mm
  38.     2nd:    1.18" / 30 mm   0.79" / 20 mm             -
  39.     3rd:    0.79" / 20 mm         -               -
  40.  
  41.    - Armoured deck - multiple decks:
  42.     For and Aft decks: 1.57" / 40 mm
  43.  
  44.    - Conning towers: Forward 1.97" / 50 mm, Aft 0.00" / 0 mm
  45.  
  46. Machinery:
  47.     Diesel Internal combustion motors,
  48.     Geared drive, 4 shafts, 52,003 shp / 38,794 Kw = 31.50 kts
  49.     Range 7,000nm at 16.50 kts
  50.     Bunker at max displacement = 1,415 tons
  51.  
  52. Complement:
  53.     331 - 431
  54.  
  55. Cost:
  56.     £2.647 million / $10.588 million
  57.  
  58. Distribution of weights at normal displacement:
  59.     Armament: 217 tons, 3.8 %
  60.        - Guns: 217 tons, 3.8 %
  61.     Armour: 1,229 tons, 21.2 %
  62.        - Belts: 387 tons, 6.7 %
  63.        - Torpedo bulkhead: 300 tons, 5.2 %
  64.        - Armament: 105 tons, 1.8 %
  65.        - Armour Deck: 422 tons, 7.3 %
  66.        - Conning Tower: 14 tons, 0.2 %
  67.     Machinery: 1,374 tons, 23.8 %
  68.     Hull, fittings & equipment: 1,865 tons, 32.2 %
  69.     Fuel, ammunition & stores: 1,100 tons, 19.0 %
  70.     Miscellaneous weights: 0 tons, 0.0 %
  71.  
  72. Overall survivability and seakeeping ability:
  73.     Survivability (Non-critical penetrating hits needed to sink ship):
  74.       8,685 lbs / 3,940 Kg = 103.7 x 5.5 " / 140 mm shells or 1.6 torpedoes
  75.     Stability (Unstable if below 1.00): 1.30
  76.     Metacentric height 3.0 ft / 0.9 m
  77.     Roll period: 12.7 seconds
  78.     Steadiness  - As gun platform (Average = 50 %): 50 %
  79.             - Recoil effect (Restricted arc if above 1.00): 0.32
  80.     Seaboat quality  (Average = 1.00): 1.00
  81.  
  82. Hull form characteristics:
  83.     Hull has a flush deck,
  84.       a normal bow and large transom stern
  85.     Block coefficient (normal/deep): 0.450 / 0.465
  86.     Length to Beam Ratio: 9.05 : 1
  87.     'Natural speed' for length: 25.24 kts
  88.     Power going to wave formation at top speed: 60 %
  89.     Trim (Max stability = 0, Max steadiness = 100): 50
  90.     Bow angle (Positive = bow angles forward): 20.00 degrees
  91.     Stern overhang: 3.28 ft / 1.00 m
  92.     Freeboard (% = length of deck as a percentage of waterline length):
  93.                 Fore end,    Aft end
  94.        - Forecastle:    13.33 %,  23.98 ft / 7.31 m,  19.62 ft / 5.98 m
  95.        - Forward deck:  30.00 %,  19.62 ft / 5.98 m,  17.72 ft / 5.40 m
  96.        - Aft deck:  43.34 %,  17.72 ft / 5.40 m,  15.26 ft / 4.65 m
  97.        - Quarter deck:  13.33 %,  15.26 ft / 4.65 m,  15.26 ft / 4.65 m
  98.        - Average freeboard:     17.63 ft / 5.37 m
  99.  
  100. Ship space, strength and comments:
  101.     Space   - Hull below water (magazines/engines, low = better): 112.8 %
  102.         - Above water (accommodation/working, high = better): 165.2 %
  103.     Waterplane Area: 16,524 Square feet or 1,535 Square metres
  104.     Displacement factor (Displacement / loading): 124 %
  105.     Structure weight / hull surface area: 87 lbs/sq ft or 424 Kg/sq metre
  106.     Hull strength (Relative):
  107.         - Cross-sectional: 0.94
  108.         - Longitudinal: 1.76
  109.         - Overall: 1.00
  110.     Cramped machinery, storage, compartmentation space
  111.     Excellent accommodation and workspace room
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