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Wednesday, September 13, 2006

The GB/BB/1914 2001 version

Unlike the original 1971 concept for the GB/BB/1914 design looked very anachronistic, with a flush deck and tower mast. The 2001 version tried very hard to look like something laid down in 1914 and completed in 1917. There is still the minor detail that the original concept greatly underestimated the necessary displacement for a ship with a 25-knot speed, an 18in armour basis, and 9-18in guns. This is the Springsharp report:
GB/BB/1914, Great Britain Battleship laid down 1914 (Engine 1917)

Displacement:
 55,223 t light; 57,842 t standard; 61,600 t normal; 64,606 t full load

Dimensions: Length overall / water x beam x draught
 801.19 ft / 800.00 ft x 120.00 ft x 32.00 ft (normal load)
 244.20 m / 243.84 m x 36.58 m  x 9.75 m

Armament:
      9 - 18.00" / 457 mm guns (3x3 guns), 2,916.00lbs / 1,322.68kg shells, 1914 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      20 - 5.00" / 127 mm guns (10x2 guns), 62.50lbs / 28.35kg shells, 1914 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 6 raised mounts - superfiring
 Weight of broadside 27,494 lbs / 12,471 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 18.0" / 457 mm 425.00 ft / 129.54 m 18.00 ft / 5.49 m
 Ends: Unarmoured
   Main Belt covers 82 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 425.00 ft / 129.54 m 33.00 ft / 10.06 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 18.0" / 457 mm 10.0" / 254 mm  18.0" / 457 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 7.00" / 178 mm, Conning tower: 18.00" / 457 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 100,819 shp / 75,211 Kw = 25.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 6,764 tons

Complement:
 1,954 - 2,541

Cost:
 £6.793 million / $27.171 million

Distribution of weights at normal displacement:
 Armament: 3,437 tons, 5.6 %
 Armour: 24,883 tons, 40.4 %
    - Belts: 6,318 tons, 10.3 %
    - Torpedo bulkhead: 2,076 tons, 3.4 %
    - Armament: 5,904 tons, 9.6 %
    - Armour Deck: 9,981 tons, 16.2 %
    - Conning Tower: 605 tons, 1.0 %
 Machinery: 3,696 tons, 6.0 %
 Hull, fittings & equipment: 23,207 tons, 37.7 %
 Fuel, ammunition & stores: 6,377 tons, 10.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   97,578 lbs / 44,261 Kg = 33.5 x 18.0 " / 457 mm shells or 17.9 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 8.2 ft / 2.5 m
 Roll period: 17.6 seconds
 Steadiness - As gun platform (Average = 50 %): 68 %
   - Recoil effect (Restricted arc if above 1.00): 0.67
 Seaboat quality  (Average = 1.00): 1.36

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.702
 Length to Beam Ratio: 6.67 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 46 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  34.00 ft / 10.36 m
    - Forecastle (20 %): 26.00 ft / 7.92 m
    - Mid (66 %):  26.00 ft / 7.92 m (18.00 ft / 5.49 m aft of break)
    - Quarterdeck (15 %): 18.00 ft / 5.49 m
    - Stern:  18.00 ft / 5.49 m
    - Average freeboard: 23.92 ft / 7.29 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 74.0 %
  - Above water (accommodation/working, high = better): 177.8 %
 Waterplane Area: 77,071 Square feet or 7,160 Square metres
 Displacement factor (Displacement / loading): 103 %
 Structure weight / hull surface area: 230 lbs/sq ft or 1,122 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.23
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

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