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Sunday, November 26, 2006

A heavy cruiser with 10in guns

I am pretty happy with this heavy cruiser with 9-10in BLR, 16-4.7in QF, 6-4.7in AA, and 24-2pdr AA guns. The speed is still 33 knots and the armour basis is 5in with a 3in deck. The range is 7,500nm at 18 knots. I am not sure how well this ship would fare against 8in-gunned cruisers, but I would hope that it could outgun and outrange them. This is the Springsharp report:
GB/CA/1921 10in guns, Great Britain Heavy Cruiser laid down 1921 (Engine 1937)

Displacement:
 19,385 t light; 20,162 t standard; 22,300 t normal; 24,010 t full load

Dimensions: Length overall / water x beam x draught
 716.62 ft / 715.00 ft x 78.00 ft x 23.00 ft (normal load)
 218.43 m / 217.93 m x 23.77 m  x 7.01 m

Armament:
      9 - 10.00" / 254 mm guns (3x3 guns), 500.00lbs / 226.80kg shells, 1921 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, 1921 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, 1921 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, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 5,689 lbs / 2,580 kg
 Shells per gun, main battery: 100

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 475.00 ft / 144.78 m 12.00 ft / 3.66 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 475.00 ft / 144.78 m 23.00 ft / 7.01 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 5.00" / 127 mm  8.00" / 203 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 135,206 shp / 100,864 Kw = 33.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 3,849 tons

Complement:
 912 - 1,186

Cost:
 £4.583 million / $18.332 million

Distribution of weights at normal displacement:
 Armament: 711 tons, 3.2 %
 Armour: 5,680 tons, 25.5 %
    - Belts: 1,197 tons, 5.4 %
    - Torpedo bulkhead: 404 tons, 1.8 %
    - Armament: 1,598 tons, 7.2 %
    - Armour Deck: 2,379 tons, 10.7 %
    - Conning Tower: 102 tons, 0.5 %
 Machinery: 3,747 tons, 16.8 %
 Hull, fittings & equipment: 9,246 tons, 41.5 %
 Fuel, ammunition & stores: 2,915 tons, 13.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   35,144 lbs / 15,941 Kg = 70.3 x 10.0 " / 254 mm shells or 4.4 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 4.2 ft / 1.3 m
 Roll period: 16.0 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.69
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.608
 Length to Beam Ratio: 9.17 : 1
 'Natural speed' for length: 30.37 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (35 %):  25.00 ft / 7.62 m
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 25.48 ft / 7.77 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 106.3 %
  - Above water (accommodation/working, high = better): 223.8 %
 Waterplane Area: 42,857 Square feet or 3,982 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 147 lbs/sq ft or 716 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.27
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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