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Monday, April 04, 2005

The battleship analog to the very large battlecruiser

I have always thought in terms of having a battleship corresponding to a battlecruiser design. I just tried out a very large battleship that is similar in concept, except having more battleship properties, to the very large battlecruiser. This is the Springsharp report:
US/BB/1941 large, United States Battleship laid down 1941 (Engine 1945)

Displacement:
 102,922 t light; 107,375 t standard; 113,714 t normal; 118,785 t full load

Dimensions: Length overall / water x beam x draught
 1,153.33 ft / 1,150.00 ft x 145.00 ft x 36.00 ft (normal load)
 351.53 m / 350.52 m x 44.20 m  x 10.97 m

Armament:
      9 - 21.00" / 533 mm guns (3x3 guns), 4,630.50lbs / 2,100.36kg shells, 1941 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, all raised mounts - superfiring
      24 - 5.10" / 130 mm guns (12x2 guns), 66.33lbs / 30.08kg shells, 1941 Model
   Breech loading guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 43,266 lbs / 19,625 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 18.0" / 457 mm 565.00 ft / 172.21 m 18.00 ft / 5.49 m
 Ends: Unarmoured
   Main Belt covers 76 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 565.00 ft / 172.21 m 36.00 ft / 10.97 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 20.0" / 508 mm 9.00" / 229 mm  18.0" / 457 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 9.00" / 229 mm, Conning tower: 18.00" / 457 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 8 shafts, 259,618 shp / 193,675 Kw = 30.00 kts
 Range 12,000nm at 15.00 kts
 Bunker at max displacement = 11,410 tons

Complement:
 3,096 - 4,025

Cost:
 £56.026 million / $224.105 million

Distribution of weights at normal displacement:
 Armament: 5,408 tons, 4.8 %
 Armour: 41,997 tons, 36.9 %
    - Belts: 8,302 tons, 7.3 %
    - Torpedo bulkhead: 3,010 tons, 2.6 %
    - Armament: 8,251 tons, 7.3 %
    - Armour Deck: 21,523 tons, 18.9 %
    - Conning Tower: 910 tons, 0.8 %
 Machinery: 6,556 tons, 5.8 %
 Hull, fittings & equipment: 48,961 tons, 43.1 %
 Fuel, ammunition & stores: 10,792 tons, 9.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   214,870 lbs / 97,463 Kg = 46.4 x 21.0 " / 533 mm shells or 43.6 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 10.7 ft / 3.3 m
 Roll period: 18.6 seconds
 Steadiness - As gun platform (Average = 50 %): 66 %
   - Recoil effect (Restricted arc if above 1.00): 0.72
 Seaboat quality  (Average = 1.00): 1.32

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.663
 Length to Beam Ratio: 7.93 : 1
 'Natural speed' for length: 33.91 kts
 Power going to wave formation at top speed: 43 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  38.00 ft / 11.58 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (50 %):  30.00 ft / 9.14 m
    - Quarterdeck (15 %): 30.00 ft / 9.14 m
    - Stern:  30.00 ft / 9.14 m
    - Average freeboard: 30.64 ft / 9.34 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 63.7 %
  - Above water (accommodation/working, high = better): 238.6 %
 Waterplane Area: 129,267 Square feet or 12,009 Square metres
 Displacement factor (Displacement / loading): 116 %
 Structure weight / hull surface area: 288 lbs/sq ft or 1,407 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.02
  - Longitudinal: 0.99
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

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