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Friday, June 10, 2005

A new design for the US/CB/1941 Large

I just redesigned the US/CB/1941 Large in Springsharp. I used my new understanding about how to specify guns so that Springsharp knows what is superfiring and what is not. I will be curious to compare this version with what I did back in April (I believe it was). The photo is not affected by this, except, perhaps, that the turrets should be spread further apart. I am pleased with the result, since the design earns the following assessment from Springsharp: "Ship has slow, easy roll, [and is] a good, steady gun platform. [The ship is a ] Good seaboat, [and] rides out heavy weather easily." This is the Springsharp report:
US/CB/1941 Large A2, Enter country Enter ship type laid down 1941 (Engine 1947)

Displacement:
 105,619 t light; 110,141 t standard; 116,500 t normal; 121,587 t full load

Dimensions: Length overall / water x beam x draught
 1,254.10 ft / 1,250.00 ft x 150.00 ft x 37.00 ft (normal load)
 382.25 m / 381.00 m x 45.72 m  x 11.28 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, 1 raised mount - superfiring
      24 - 5.10" / 130 mm guns (12x2 guns), 66.33lbs / 30.08kg shells, 1941 Model
   Breech loading guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
      84 - 1.57" / 40.0 mm guns (41 mounts), 1.95lbs / 0.89kg shells, 1941 Model
   Breech loading guns in deck mounts with hoists
   on side ends, majority forward, 14 raised mounts - superfiring
 Weight of broadside 43,430 lbs / 19,700 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 15.0" / 381 mm 810.00 ft / 246.89 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 100 % of normal length

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 17.0" / 432 mm 9.00" / 229 mm  15.0" / 381 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm
 3rd: 2.00" / 51 mm       -         -

   - Armour deck: 8.00" / 203 mm, Conning tower: 17.00" / 432 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 8 shafts, 447,625 shp / 333,928 Kw = 35.00 kts
 Range 12,000nm at 15.00 kts
 Bunker at max displacement = 11,446 tons

Complement:
 3,152 - 4,098

Cost:
 £60.612 million / $242.450 million

Distribution of weights at normal displacement:
 Armament: 5,429 tons, 4.7 %
 Armour: 37,797 tons, 32.4 %
    - Belts: 8,786 tons, 7.5 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 8,073 tons, 6.9 %
    - Armour Deck: 20,065 tons, 17.2 %
    - Conning Tower: 874 tons, 0.7 %
 Machinery: 11,058 tons, 9.5 %
 Hull, fittings & equipment: 51,335 tons, 44.1 %
 Fuel, ammunition & stores: 10,881 tons, 9.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   206,334 lbs / 93,591 Kg = 44.6 x 21.0 " / 533 mm shells or 9.1 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 12.4 ft / 3.8 m
 Roll period: 17.9 seconds
 Steadiness - As gun platform (Average = 50 %): 71 %
   - Recoil effect (Restricted arc if above 1.00): 0.63
 Seaboat quality  (Average = 1.00): 1.41

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.588
 Length to Beam Ratio: 8.33 : 1
 'Natural speed' for length: 35.36 kts
 Power going to wave formation at top speed: 46 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  40.00 ft / 12.19 m
    - Forecastle (20 %): 35.00 ft / 10.67 m
    - Mid (50 %):  35.00 ft / 10.67 m
    - Quarterdeck (15 %): 35.00 ft / 10.67 m
    - Stern:  35.00 ft / 10.67 m
    - Average freeboard: 35.40 ft / 10.79 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 66.1 %
  - Above water (accommodation/working, high = better): 286.7 %
 Waterplane Area: 135,571 Square feet or 12,595 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 278 lbs/sq ft or 1,360 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.99
  - Longitudinal: 1.06
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily

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