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Saturday, September 06, 2008

The GB/CB/1916 with a long belt

With a long belt, the GB/CB/1916 can still make 34 knots. The original concept for the design was to use a very short armour belt so as to make the maximum speed. This is a version with a longer belt (110% of normal). This is the Springsharp report:
GB/CB/1916 Protected, Great Britain Battlecruiser laid down 1916 (Engine 1921)

Displacement:
 42,841 t light; 44,542 t standard; 46,914 t normal; 48,811 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (862.86 ft / 855.00 ft) x 105.00 ft x (31.00 / 32.02 ft)
 (263.00 m / 260.60 m) x 32.00 m  x (9.45 / 9.76 m)

Armament:
      6 - 16.50" / 419 mm 45.0 cal guns - 2,265.01lbs / 1,027.39kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1916 Model
   2 x Triple mounts on centreline, forward deck forward
  1 raised mount - superfiring
      10 - 6.00" / 152 mm 45.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1916 Model
   10 x Single mounts on sides, forward deck aft
  2 raised mounts - superfiring
      Weight of broadside 14,590 lbs / 6,618 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 610.00 ft / 185.93 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 610.00 ft / 185.93 m 8.00 ft / 2.44 m
   Main Belt covers 110 % of normal length
   Main belt does not fully cover magazines and engineering spaces
   Main Belt inclined -12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 610.00 ft / 185.93 m 31.00 ft / 9.45 m
 Beam between torpedo bulkheads 64.00 ft / 19.51 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 8.00" / 203 mm  12.0" / 305 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 3.00" / 76 mm
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 259,314 shp / 193,448 Kw = 34.00 kts
 Range 5,400nm at 16.00 kts
 Bunker at max displacement = 4,269 tons

Complement:
 1,593 - 2,071

Cost:
 £6.740 million / $26.962 million

Distribution of weights at normal displacement:
 Armament: 2,467 tons, 5.3 %
    - Guns: 2,467 tons, 5.3 %
 Armour: 12,455 tons, 26.5 %
    - Belts: 4,052 tons, 8.6 %
    - Torpedo bulkhead: 1,399 tons, 3.0 %
    - Armament: 2,808 tons, 6.0 %
    - Armour Deck: 3,635 tons, 7.7 %
    - Conning Towers: 560 tons, 1.2 %
 Machinery: 8,930 tons, 19.0 %
 Hull, fittings & equipment: 18,989 tons, 40.5 %
 Fuel, ammunition & stores: 4,073 tons, 8.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   62,606 lbs / 28,398 Kg = 27.9 x 16.5 " / 419 mm shells or 7.7 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 6.8 ft / 2.1 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.71
 Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
 Hull has low quarterdeck ,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.590 / 0.594
 Length to Beam Ratio: 8.14 : 1
 'Natural speed' for length: 29.24 kts
 Power going to wave formation at top speed: 56 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 12.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  37.00 ft / 11.28 m,  32.00 ft / 9.75 m
    - Forward deck: 30.00 %,  32.00 ft / 9.75 m,  30.00 ft / 9.14 m
    - Aft deck: 22.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Quarter deck: 28.00 %,  22.00 ft / 6.71 m,  23.00 ft / 7.01 m
    - Average freeboard:  29.00 ft / 8.84 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 144.8 %
  - Above water (accommodation/working, high = better): 237.8 %
 Waterplane Area: 65,049 Square feet or 6,043 Square metres
 Displacement factor (Displacement / loading): 108 %
 Structure weight / hull surface area: 209 lbs/sq ft or 1,020 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.41
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

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