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Tuesday, December 20, 2005

The GB/CA/1935 design

The GB/CA/1935 design consolidates the progress made up to the previous design. The armour basis is now 5in and the range is 8,500nm at 15 knots. The maximum speed of 35 knots is competitive with the Japanese ships and probably is better, in that a larger ship with a higher freeboard will maintain its speed better in a seaway. This design can also hit harder than the Japanese, except for the torpedo situation. At least this design is said to be good for 3 torpedo hits, although perhaps of the 21in sort. This is the Springsharp report:
GB/CA/1935, Great Britain Heavy Cruiser laid down 1935

Displacement:
 17,212 t light; 17,931 t standard; 19,450 t normal; 20,665 t full load

Dimensions: Length overall / water x beam x draught
 694.00 ft / 694.00 ft x 68.00 ft x 25.00 ft (normal load)
 211.53 m / 211.53 m x 20.73 m  x 7.62 m

Armament:
      12 - 8.00" / 203 mm guns (4x3 guns), 256.00lbs / 116.12kg shells, 1935 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      12 - 4.70" / 119 mm guns (6x2 guns), 51.91lbs / 23.55kg shells, 1935 Model
   Dual purpose guns in turrets (on barbettes)
   on side, all amidships
      40 - 1.57" / 40.0 mm guns (10x4 guns), 1.95lbs / 0.89kg shells, 1935 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread
 Weight of broadside 3,773 lbs / 1,711 kg
 Shells per gun, main battery: 150
 16 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 640.00 ft / 195.07 m 5.00 ft / 1.52 m
 Ends: Unarmoured
   Main Belt covers 142 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 640.00 ft / 195.07 m 24.00 ft / 7.32 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 3.00" / 76 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm
 3rd: 1.00" / 25 mm       -         -

   - Armour deck: 4.00" / 102 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 154,269 shp / 115,084 Kw = 35.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 2,735 tons

Complement:
 823 - 1,070

Cost:
 £8.207 million / $32.829 million

Distribution of weights at normal displacement:
 Armament: 472 tons, 2.4 %
 Armour: 4,962 tons, 25.5 %
    - Belts: 633 tons, 3.3 %
    - Torpedo bulkhead: 568 tons, 2.9 %
    - Armament: 1,063 tons, 5.5 %
    - Armour Deck: 2,604 tons, 13.4 %
    - Conning Tower: 93 tons, 0.5 %
 Machinery: 4,383 tons, 22.5 %
 Hull, fittings & equipment: 7,396 tons, 38.0 %
 Fuel, ammunition & stores: 2,238 tons, 11.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   24,658 lbs / 11,185 Kg = 96.3 x 8.0 " / 203 mm shells or 3.0 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 3.3 ft / 1.0 m
 Roll period: 15.7 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.69
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.577
 Length to Beam Ratio: 10.21 : 1
 'Natural speed' for length: 29.78 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 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 %): 24.00 ft / 7.32 m
    - Mid (50 %):  24.00 ft / 7.32 m
    - Quarterdeck (15 %): 24.00 ft / 7.32 m
    - Stern:  24.00 ft / 7.32 m
    - Average freeboard: 24.56 ft / 7.49 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 130.8 %
  - Above water (accommodation/working, high = better): 149.8 %
 Waterplane Area: 35,189 Square feet or 3,269 Square metres
 Displacement factor (Displacement / loading): 111 %
 Structure weight / hull surface area: 129 lbs/sq ft or 628 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.42
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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