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Saturday, April 30, 2005

A British armored cruiser design

This is similar to one of the altenative designs being considered in 1904-1905. This is like an armored cruiser version of the Untakeable battleship design. The armament is 9.2 in guns with an anti-torpedo boat armament of 4in QF guns. This is the Springsharp report:
GB/CA/1905, Great Britain Armored Cruiser laid down 1905 (Engine 1914)

Displacement:
 16,384 t light; 17,349 t standard; 19,602 t normal; 21,405 t full load

Dimensions: Length overall / water x beam x draught
 565.00 ft / 565.00 ft x 84.00 ft x 26.00 ft (normal load)
 172.21 m / 172.21 m x 25.60 m  x 7.92 m

Armament:
      16 - 9.20" / 234 mm guns (8x2 guns), 389.34lbs / 176.60kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on side ends, evenly spread, all raised mounts - superfiring
      16 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
   Quick firing guns in casemate mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 6,742 lbs / 3,058 kg
 Shells per gun, main battery: 150

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 320.00 ft / 97.54 m 17.00 ft / 5.18 m
 Ends: 4.00" / 102 mm 230.00 ft / 70.10 m 17.00 ft / 5.18 m
   15.00 ft / 4.57 m Unarmoured ends
   Main Belt covers 87 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.50" / 38 mm 320.00 ft / 97.54 m 24.00 ft / 7.32 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 2.50" / 64 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 52,378 shp / 39,074 Kw = 25.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 4,056 tons

Complement:
 827 - 1,076

Cost:
 £1.564 million / $6.255 million

Distribution of weights at normal displacement:
 Armament: 843 tons, 4.3 %
 Armour: 5,872 tons, 30.0 %
    - Belts: 2,040 tons, 10.4 %
    - Torpedo bulkhead: 426 tons, 2.2 %
    - Armament: 1,771 tons, 9.0 %
    - Armour Deck: 1,541 tons, 7.9 %
    - Conning Tower: 94 tons, 0.5 %
 Machinery: 2,018 tons, 10.3 %
 Hull, fittings & equipment: 7,652 tons, 39.0 %
 Fuel, ammunition & stores: 3,218 tons, 16.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   31,049 lbs / 14,084 Kg = 79.7 x 9.2 " / 234 mm shells or 5.1 torpedoes
 Stability (Unstable if below 1.00): 1.03
 Metacentric height 4.1 ft / 1.2 m
 Roll period: 17.5 seconds
 Steadiness - As gun platform (Average = 50 %): 64 %
   - Recoil effect (Restricted arc if above 1.00): 0.82
 Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.556
 Length to Beam Ratio: 6.73 : 1
 'Natural speed' for length: 23.77 kts
 Power going to wave formation at top speed: 52 %
 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 (67 %):  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: 22.60 ft / 6.89 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 88.4 %
  - Above water (accommodation/working, high = better): 174.8 %
 Waterplane Area: 33,309 Square feet or 3,094 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 156 lbs/sq ft or 759 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.69
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

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