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Friday, December 01, 2006

You thought that my last design was extreme: look at the GB/CB/1923

For the GB/CB/1923 to still make 38 knots, to have 9-16in guns, to still have a 7in belt rather than a 6in belt, and to have a 2in torpedo bulkhead, the length grew to 924ft on the waterline and the Standard displacement to 52,367 tons. The ship requires 6 screws, because of the 75,000 SHP per shaft limitation. The beam is up to 115ft and the draft increased to 34 ft. The freeboard is increased to 32ft. That is required to still have an adequate seakeeping capability. This is the Springsharp report:
GB/CB/1923 16in guns 38 knots, Great Britain Battlecruiser laid down 1923 (Engine 1940)

Displacement:
 50,252 t light; 52,367 t standard; 56,000 t normal; 58,906 t full load

Dimensions: Length overall / water x beam x draught
 927.32 ft / 924.00 ft x 115.00 ft x 34.00 ft (normal load)
 282.65 m / 281.64 m x 35.05 m  x 10.36 m

Armament:
      9 - 16.00" / 406 mm guns (3x3 guns), 2,048.00lbs / 928.96kg shells, 1923 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 4.70" / 119 mm guns (6 mounts), 51.91lbs / 23.55kg shells, 1923 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1923 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      24 - 1.57" / 40.0 mm guns (6x4 guns), 1.95lbs / 0.89kg shells, 1923 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 19,621 lbs / 8,900 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 7.00" / 178 mm 610.00 ft / 185.93 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 102 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 610.00 ft / 185.93 m 34.00 ft / 10.36 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 6.00" / 152 mm  8.00" / 203 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 6 shafts, 367,410 shp / 274,088 Kw = 38.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 6,540 tons

Complement:
 1,819 - 2,366

Cost:
 £15.111 million / $60.443 million

Distribution of weights at normal displacement:
 Armament: 2,453 tons, 4.4 %
 Armour: 13,395 tons, 23.9 %
    - Belts: 2,900 tons, 5.2 %
    - Torpedo bulkhead: 1,535 tons, 2.7 %
    - Armament: 3,035 tons, 5.4 %
    - Armour Deck: 5,672 tons, 10.1 %
    - Conning Tower: 252 tons, 0.5 %
 Machinery: 9,824 tons, 17.5 %
 Hull, fittings & equipment: 24,581 tons, 43.9 %
 Fuel, ammunition & stores: 5,748 tons, 10.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   74,227 lbs / 33,669 Kg = 36.2 x 16.0 " / 406 mm shells or 9.1 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 7.6 ft / 2.3 m
 Roll period: 17.5 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.70
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.543
 Length to Beam Ratio: 8.03 : 1
 'Natural speed' for length: 35.13 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 54
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  38.00 ft / 11.58 m
    - Forecastle (20 %): 32.00 ft / 9.75 m
    - Mid (35 %):  32.00 ft / 9.75 m
    - Quarterdeck (15 %): 32.00 ft / 9.75 m
    - Stern:  32.00 ft / 9.75 m
    - Average freeboard: 32.48 ft / 9.90 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 108.7 %
  - Above water (accommodation/working, high = better): 256.9 %
 Waterplane Area: 76,653 Square feet or 7,121 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 222 lbs/sq ft or 1,085 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.53
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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