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Saturday, May 10, 2008

The battlecruiser analog of the GB/BB/1906: the GB/CB/1906

The battlecruiser version of the GB/BB/1906 naturally has lighter armour and higher speed. The lower belt is still 8in thick, so it is not another Invincible. The speed is also higher at 27 knots (although I had heard that an invincible might be able to make higher speed). The ships have 8-12in/45 and 16-4in QF guns. This is the Springsharp report:
\GB/BB/1906, Great Britain Battlecruiser laid down 1906 (Engine 1911)

Displacement:
 20,854 t light; 21,808 t standard; 26,192 t normal; 29,700 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (645.00 ft / 638.00 ft) x 82.00 ft x (27.00 / 30.07 ft)
 (196.60 m / 194.46 m) x 24.99 m  x (8.23 / 9.16 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 100 per gun
   Breech loading guns in turret on barbette mounts, 1906 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1906 Model
   16 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 7,487 lbs / 3,396 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 430.00 ft / 131.06 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 6.00" / 152 mm 430.00 ft / 131.06 m 8.00 ft / 2.44 m
   Main Belt covers 104 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 430.00 ft / 131.06 m 27.00 ft / 8.23 m
 Beam between torpedo bulkheads 56.00 ft / 17.07 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 8.00" / 203 mm  10.0" / 254 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

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

   - Conning towers: Forward 11.00" / 279 mm, Aft 8.00" / 203 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 82,731 shp / 61,717 Kw = 27.00 kts
 Range 7,500nm at 16.00 kts
 Bunker at max displacement = 7,891 tons (100% coal)

Complement:
 1,029 - 1,338

Cost:
 £1.923 million / $7.691 million

Distribution of weights at normal displacement:
 Armament: 1,331 tons, 5.1 %
    - Guns: 1,331 tons, 5.1 %
 Armour: 7,070 tons, 27.0 %
    - Belts: 2,188 tons, 8.4 %
    - Torpedo bulkhead: 859 tons, 3.3 %
    - Armament: 2,171 tons, 8.3 %
    - Armour Deck: 1,491 tons, 5.7 %
    - Conning Towers: 361 tons, 1.4 %
 Machinery: 3,693 tons, 14.1 %
 Hull, fittings & equipment: 8,759 tons, 33.4 %
 Fuel, ammunition & stores: 5,338 tons, 20.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   42,557 lbs / 19,303 Kg = 49.3 x 12.0 " / 305 mm shells or 6.1 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 4.6 ft / 1.4 m
 Roll period: 16.0 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.82
 Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.649 / 0.661
 Length to Beam Ratio: 7.78 : 1
 'Natural speed' for length: 25.26 kts
 Power going to wave formation at top speed: 53 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  29.00 ft / 8.84 m,  27.00 ft / 8.23 m
    - Forward deck: 30.00 %,  27.00 ft / 8.23 m,  26.00 ft / 7.92 m
    - Aft deck: 14.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 31.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  24.12 ft / 7.35 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 102.2 %
  - Above water (accommodation/working, high = better): 195.2 %
 Waterplane Area: 40,040 Square feet or 3,720 Square metres
 Displacement factor (Displacement / loading): 125 %
 Structure weight / hull surface area: 155 lbs/sq ft or 758 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.52
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

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