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Thursday, November 30, 2006

"Up to my old tricks": a 38 knot ship with 9-14in guns

I could not resist doing my usual thing ("My old tricks"). I tried a 38 knot battlecruiser with 9-14in guns. The belt is 7in and the deck is 4in. The secondary and AA armaments are what I have been using. They are unchanged from the other ships in this series. I still like having a big ship that will outrun smaller ships in a seaway. There is essentially nothing at sea that this ship cannot catch. Some smaller ships may be faster in a flat calm, for a short time, but in normal conditions, they will not be able to run away. This ship can outrun anything, but aircraft, that could damage it. This is the Springsharp report:
GB/CB/1921 14in guns 38 knots, Great Britain Battlecruiser laid down 1923 (Engine 1940)

Displacement:
 43,543 t light; 45,203 t standard; 48,500 t normal; 51,137 t full load

Dimensions: Length overall / water x beam x draught
 881.32 ft / 878.00 ft x 114.00 ft x 33.00 ft (normal load)
 268.63 m / 267.61 m x 34.75 m  x 10.06 m

Armament:
      9 - 14.00" / 356 mm guns (3x3 guns), 1,372.00lbs / 622.33kg 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 13,537 lbs / 6,140 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 7.00" / 178 mm 580.00 ft / 176.78 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:
  1.00" / 25 mm 580.00 ft / 176.78 m 33.00 ft / 10.06 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 6 shafts, 337,652 shp / 251,888 Kw = 38.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 5,934 tons

Complement:
 1,633 - 2,124

Cost:
 £12.245 million / $48.981 million

Distribution of weights at normal displacement:
 Armament: 1,692 tons, 3.5 %
 Armour: 11,812 tons, 24.4 %
    - Belts: 2,763 tons, 5.7 %
    - Torpedo bulkhead: 708 tons, 1.5 %
    - Armament: 2,884 tons, 5.9 %
    - Armour Deck: 5,200 tons, 10.7 %
    - Conning Tower: 258 tons, 0.5 %
 Machinery: 9,028 tons, 18.6 %
 Hull, fittings & equipment: 21,010 tons, 43.3 %
 Fuel, ammunition & stores: 4,957 tons, 10.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   69,860 lbs / 31,688 Kg = 50.9 x 14.0 " / 356 mm shells or 8.0 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 8.0 ft / 2.4 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.49
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.514
 Length to Beam Ratio: 7.70 : 1
 'Natural speed' for length: 34.49 kts
 Power going to wave formation at top speed: 60 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 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): 105.3 %
  - Above water (accommodation/working, high = better): 262.3 %
 Waterplane Area: 70,264 Square feet or 6,528 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 206 lbs/sq ft or 1,008 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.65
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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