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Saturday, November 25, 2006

A 33-knot heavy cruiser with 8-9.2in guns

This is a rather different approach to a 9.2in-gunned, heavy cruiser. The version is designed to make 33 knots. The hull is flush-decked with a transom stern. The main armament is 9-9.2in BLR in triple turrets. The armour basis is 4in with a 2in deck. The cruising range is 7,500nm at 18 knots. The Standard displacement is 13,988 tons. This is the Springsharp report:
GB/CA/1921, Great Britain Heavy Cruiser laid down 1921 (Engine 1937)

Displacement:
 13,393 t light; 13,988 t standard; 15,700 t normal; 17,069 t full load

Dimensions: Length overall / water x beam x draught
 666.36 ft / 665.00 ft x 65.00 ft x 22.00 ft (normal load)
 203.11 m / 202.69 m x 19.81 m  x 6.71 m

Armament:
      9 - 9.20" / 234 mm guns (3x3 guns), 389.34lbs / 176.60kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      8 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      16 - 1.57" / 40.0 mm guns (4x4 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 4,079 lbs / 1,850 kg
 Shells per gun, main battery: 120

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 425.00 ft / 129.54 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 98 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 425.00 ft / 129.54 m 22.00 ft / 6.71 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 109,062 shp / 81,360 Kw = 33.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 3,081 tons

Complement:
 700 - 911

Cost:
 £3.361 million / $13.442 million

Distribution of weights at normal displacement:
 Armament: 510 tons, 3.2 %
 Armour: 3,267 tons, 20.8 %
    - Belts: 852 tons, 5.4 %
    - Torpedo bulkhead: 346 tons, 2.2 %
    - Armament: 822 tons, 5.2 %
    - Armour Deck: 1,194 tons, 7.6 %
    - Conning Tower: 54 tons, 0.3 %
 Machinery: 3,023 tons, 19.3 %
 Hull, fittings & equipment: 6,593 tons, 42.0 %
 Fuel, ammunition & stores: 2,307 tons, 14.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   22,006 lbs / 9,982 Kg = 56.5 x 9.2 " / 234 mm shells or 2.8 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 3.1 ft / 0.9 m
 Roll period: 15.5 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.91
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.578
 Length to Beam Ratio: 10.23 : 1
 'Natural speed' for length: 29.14 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:  26.00 ft / 7.92 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (35 %):  23.00 ft / 7.01 m
    - Quarterdeck (15 %): 23.00 ft / 7.01 m
    - Stern:  23.00 ft / 7.01 m
    - Average freeboard: 23.24 ft / 7.08 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 126.5 %
  - Above water (accommodation/working, high = better): 201.9 %
 Waterplane Area: 32,257 Square feet or 2,997 Square metres
 Displacement factor (Displacement / loading): 117 %
 Structure weight / hull surface area: 128 lbs/sq ft or 626 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.40
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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