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Tuesday, January 01, 2008

A 36 knot heavy cruiser

This is the heavy cruiser counterpart to the 37 knot light cruiser. The heavy cruiser has 4in side armour and 10-8in/50 guns. The speed had to be reduced to 36 knots, which is still comparable to the big Japanese cruisers. This is the Springsharp report:
GB/CA/1932, Great Britain Heavy Cruiser laid down 1932 (Engine 1950)

Displacement:
 14,068 t light; 14,656 t standard; 15,974 t normal; 17,029 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (671.00 ft / 665.00 ft) x 68.00 ft x (22.00 / 23.11 ft)
 (204.52 m / 202.69 m) x 20.73 m  x (6.71 / 7.04 m)

Armament:
      10 - 8.00" / 203 mm 50.0 cal guns - 250.00lbs / 113.40kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1932 Model
   5 x Twin mounts on centreline ends, majority forward
  2 raised mounts - superfiring
      12 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts, 1932 Model
   6 x Twin mounts on sides, forward deck aft
      24 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 150 per gun
   Anti-air guns in deck mounts, 1932 Model
   4 x 2 row sextuple mounts on sides, aft deck forward
  4 raised mounts
      Weight of broadside 2,935 lbs / 1,331 kg
      16 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.469 t each, 23.507 t total
 In 4 sets of deck mounted side rotating tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 460.00 ft / 140.21 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 106 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  0.90" / 23 mm 460.00 ft / 140.21 m 22.00 ft / 6.71 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 2.00" / 51 mm For and Aft decks
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 4.00" / 102 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 155,091 shp / 115,698 Kw = 36.00 kts
 Range 6,500nm at 17.00 kts
 Bunker at max displacement = 2,374 tons

Complement:
 709 - 923

Cost:
 £6.067 million / $24.267 million

Distribution of weights at normal displacement:
 Armament: 797 tons, 5.0 %
    - Guns: 773 tons, 4.8 %
    - Torpedoes: 24 tons, 0.1 %
 Armour: 3,392 tons, 21.2 %
    - Belts: 1,207 tons, 7.6 %
    - Torpedo bulkhead: 337 tons, 2.1 %
    - Armament: 555 tons, 3.5 %
    - Armour Deck: 1,239 tons, 7.8 %
    - Conning Tower: 55 tons, 0.3 %
 Machinery: 3,710 tons, 23.2 %
 Hull, fittings & equipment: 6,169 tons, 38.6 %
 Fuel, ammunition & stores: 1,906 tons, 11.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   21,782 lbs / 9,880 Kg = 85.1 x 8.0 " / 203 mm shells or 2.7 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 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.60
 Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
 Hull has rise forward of midbreak,
   an extended bulbous bow and large transom stern
 Block coefficient (normal/deep): 0.562 / 0.570
 Length to Beam Ratio: 9.78 : 1
 'Natural speed' for length: 29.28 kts
 Power going to wave formation at top speed: 61 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 10.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 32.00 %,  34.00 ft / 10.36 m,  28.00 ft / 8.53 m
    - Forward deck: 30.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Aft deck: 23.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Quarter deck: 15.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Average freeboard:  25.73 ft / 7.84 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 133.5 %
  - Above water (accommodation/working, high = better): 215.5 %
 Waterplane Area: 33,236 Square feet or 3,088 Square metres
 Displacement factor (Displacement / loading): 115 %
 Structure weight / hull surface area: 120 lbs/sq ft or 586 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.73
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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