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OMWHA Test Ship2 RFP 1917

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  1. Omwha, USA Scout Cruiser  laid down 1917
  2.  
  3. Displacement:
  4.     6,573 t light; 6,909 t standard; 7,500 t normal; 7,973 t full load
  5.  
  6. Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
  7.     (576.26 ft / 549.87 ft) x 55.77 ft x (13.48 / 14.20 ft)
  8.     (175.64 m / 167.60 m) x 17.00 m  x (4.11 / 4.33 m)
  9.  
  10. Armament:
  11.       4 - 9.00" / 229 mm 98.0 cal guns - 275.00lbs / 124.74kg shells, 150 per gun
  12.       Breech loading guns in deck and hoist mounts, 1917 Model
  13.       4 x Single mounts on centreline, evenly spread
  14.       10 - 5.00" / 127 mm 25.0 cal guns - 80.01lbs / 36.29kg shells, 150 per gun
  15.       Breech loading guns in deck mounts, 1917 Model
  16.       10 x Single mounts on sides, evenly spread
  17.       12 - 2.95" / 75.0 mm 50.0 cal guns - 24.01lbs / 10.89kg shells, 150 per gun
  18.       Breech loading guns in deck mounts, 1917 Model
  19.       12 x Single mounts on sides, evenly spread
  20.       25 - 1.46" / 37.0 mm 30.0 cal guns - 1.42lbs / 0.65kg shells, 150 per gun
  21.       Breech loading guns in deck mounts, 1917 Model
  22.       25 x Single mounts on sides, evenly spread
  23.       Weight of broadside 2,224 lbs / 1,009 kg
  24.       Main Torpedoes
  25.       2 - 21.0" / 533 mm, 21.36 ft / 6.51 m torpedoes - 1.369 t each, 2.739 t total
  26.     In 2 sets of deck mounted side rotating tubes
  27.       Mines
  28.       45 - 120.00 lbs / 54.43 kg mines - 2.411 t total
  29.  
  30. Armour:
  31.    - Belts:     Width (max) Length (avg)        Height (avg)
  32.     Main:   2.99" / 76 mm   511.15 ft / 155.80 m    8.92 ft / 2.72 m
  33.     Ends:   Unarmoured
  34.     Upper:  1.46" / 37 mm   511.15 ft / 155.80 m    8.01 ft / 2.44 m
  35.       Main Belt covers 143 % of normal length
  36.  
  37.    - Torpedo Bulkhead - Strengthened structural bulkheads:
  38.         0.39" / 10 mm   511.15 ft / 155.80 m    12.01 ft / 3.66 m
  39.     Beam between torpedo bulkheads 55.12 ft / 16.80 m
  40.  
  41.    - Hull void:
  42.         0.39" / 10 mm   511.15 ft / 155.80 m    12.01 ft / 3.66 m
  43.  
  44.    - Gun armour:    Face (max)  Other gunhouse (avg)    Barbette/hoist (max)
  45.     Main:   0.98" / 25 mm   0.98" / 25 mm       0.98" / 25 mm
  46.     2nd:    0.39" / 10 mm         -               -
  47.  
  48.    - Armoured deck - multiple decks:
  49.     For and Aft decks: 0.98" / 25 mm
  50.     Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm
  51.  
  52.    - Conning towers: Forward 2.20" / 56 mm, Aft 0.00" / 0 mm
  53.  
  54. Machinery:
  55.     Oil fired boilers, steam turbines,
  56.     Geared drive, 6 shafts, 53,025 shp / 39,557 Kw = 29.00 kts
  57.     Range 10,000nm at 10.00 kts
  58.     Bunker at max displacement = 1,065 tons
  59.  
  60. Complement:
  61.     402 - 523
  62.  
  63. Cost:
  64.     £1.593 million / $6.372 million
  65.  
  66. Distribution of weights at normal displacement:
  67.     Armament: 1,059 tons, 14.1 %
  68.        - Guns: 1,048 tons, 14.0 %
  69.        - Weapons: 10 tons, 0.1 %
  70.     Armour: 1,443 tons, 19.2 %
  71.        - Belts: 767 tons, 10.2 %
  72.        - Torpedo bulkhead: 89 tons, 1.2 %
  73.        - Void: 89 tons, 1.2 %
  74.        - Armament: 54 tons, 0.7 %
  75.        - Armour Deck: 425 tons, 5.7 %
  76.        - Conning Tower: 18 tons, 0.2 %
  77.     Machinery: 1,944 tons, 25.9 %
  78.     Hull, fittings & equipment: 2,128 tons, 28.4 %
  79.     Fuel, ammunition & stores: 927 tons, 12.4 %
  80.     Miscellaneous weights: 0 tons, 0.0 %
  81.  
  82. Overall survivability and seakeeping ability:
  83.     Survivability (Non-critical penetrating hits needed to sink ship):
  84.       5,537 lbs / 2,512 Kg = 15.2 x 9.0 " / 229 mm shells or 1.0 torpedoes
  85.     Stability (Unstable if below 1.00): 1.20
  86.     Metacentric height 2.9 ft / 0.9 m
  87.     Roll period: 13.7 seconds
  88.     Steadiness  - As gun platform (Average = 50 %): 51 %
  89.             - Recoil effect (Restricted arc if above 1.00): 0.58
  90.     Seaboat quality  (Average = 1.00): 1.02
  91.  
  92. Hull form characteristics:
  93.     Hull has a flush deck,
  94.       a straight bulbous bow and a cruiser stern
  95.     Block coefficient (normal/deep): 0.635 / 0.641
  96.     Length to Beam Ratio: 9.86 : 1
  97.     'Natural speed' for length: 23.45 kts
  98.     Power going to wave formation at top speed: 55 %
  99.     Trim (Max stability = 0, Max steadiness = 100): 50
  100.     Bow angle (Positive = bow angles forward): 34.00 degrees
  101.     Stern overhang: 9.00 ft / 2.74 m
  102.     Freeboard (% = length of deck as a percentage of waterline length):
  103.                 Fore end,    Aft end
  104.        - Forecastle:    20.00 %,  25.79 ft / 7.86 m,  21.10 ft / 6.43 m
  105.        - Forward deck:  30.00 %,  21.10 ft / 6.43 m,  16.40 ft / 5.00 m
  106.        - Aft deck:  35.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
  107.        - Quarter deck:  15.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
  108.        - Average freeboard:     18.42 ft / 5.61 m
  109.     Ship tends to be wet forward
  110.  
  111. Ship space, strength and comments:
  112.     Space   - Hull below water (magazines/engines, low = better): 129.4 %
  113.         - Above water (accommodation/working, high = better): 188.8 %
  114.     Waterplane Area: 23,167 Square feet or 2,152 Square metres
  115.     Displacement factor (Displacement / loading): 84 %
  116.     Structure weight / hull surface area: 84 lbs/sq ft or 409 Kg/sq metre
  117.     Hull strength (Relative):
  118.         - Cross-sectional: 0.86
  119.         - Longitudinal: 0.92
  120.         - Overall: 0.87
  121.     Caution: Hull subject to strain in open-sea
  122.     Cramped machinery, storage, compartmentation space
  123.     Excellent accommodation and workspace room
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