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Friday, October 27, 2006

The GB/CB/1907 Design E from 5 December 1906

Design E would have been a very good ship, as were some of the earlier versions. Design E had a 9in armour basis and had a maximum speed of 25 knots. The armament was the usual 8-12in guns and 16-4in QF guns. Design E would have been more costly, as the design displacement was 21,400 tons. This is the Springsharp report:
GB/CB/1907 Design E-5 Dec 1906, Great Britain Battlecruiser laid down 1907

Displacement:
 18,350 t light; 19,190 t standard; 22,400 t normal; 24,968 t full load

Dimensions: Length overall / water x beam x draught
 590.00 ft / 590.00 ft x 83.00 ft x 27.00 ft (normal load)
 179.83 m / 179.83 m x 25.30 m  x 8.23 m

Armament:
      4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1907 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1907 Model
   Breech loading guns in turrets (on barbettes)
   on side, all amidships
      16 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1907 Model
   Quick firing guns in casemate mounts 
   on side, evenly spread, 8 raised mounts
 Weight of broadside 7,424 lbs / 3,367 kg
 Shells per gun, main battery: 90
 5 - 18.0" / 457.2 mm submerged torpedo tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 9.00" / 229 mm 390.00 ft / 118.87 m 8.00 ft / 2.44 m
 Ends: 4.00" / 102 mm   80.00 ft / 24.38 m 8.00 ft / 2.44 m
   120.00 ft / 36.58 m Unarmoured ends
 Upper: 5.00" / 127 mm 390.00 ft / 118.87 m 8.00 ft / 2.44 m
   Main Belt covers 102 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.50" / 38 mm 390.00 ft / 118.87 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 2nd: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 3rd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 56,375 shp / 42,056 Kw = 25.00 kts
 Range 5,700nm at 15.00 kts
 Bunker at max displacement = 5,778 tons (100% coal)

Complement:
 915 - 1,190

Cost:
 £1.915 million / $7.660 million

Distribution of weights at normal displacement:
 Armament: 928 tons, 4.1 %
 Armour: 5,692 tons, 25.4 %
    - Belts: 1,978 tons, 8.8 %
    - Torpedo bulkhead: 584 tons, 2.6 %
    - Armament: 1,659 tons, 7.4 %
    - Armour Deck: 1,316 tons, 5.9 %
    - Conning Tower: 154 tons, 0.7 %
 Machinery: 3,523 tons, 15.7 %
 Hull, fittings & equipment: 8,206 tons, 36.6 %
 Fuel, ammunition & stores: 4,050 tons, 18.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   29,018 lbs / 13,162 Kg = 33.6 x 12.0 " / 305 mm shells or 4.0 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 5.1 ft / 1.6 m
 Roll period: 15.4 seconds
 Steadiness - As gun platform (Average = 50 %): 73 %
   - Recoil effect (Restricted arc if above 1.00): 0.64
 Seaboat quality  (Average = 1.00): 1.45

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.593
 Length to Beam Ratio: 7.11 : 1
 'Natural speed' for length: 24.29 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  28.00 ft / 8.53 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (68 %):  25.00 ft / 7.62 m (17.00 ft / 5.18 m aft of break)
    - Quarterdeck (15 %): 17.00 ft / 5.18 m
    - Stern:  17.00 ft / 5.18 m
    - Average freeboard: 22.68 ft / 6.91 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 112.7 %
  - Above water (accommodation/working, high = better): 169.7 %
 Waterplane Area: 35,581 Square feet or 3,306 Square metres
 Displacement factor (Displacement / loading): 111 %
 Structure weight / hull surface area: 155 lbs/sq ft or 758 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.76
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily

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