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Monday, July 04, 2005

German Armoured Cruiser: Ger/CA/1906

The date is just guesswork, but the ship otherwise matches that period, except for triple turrets. This is a ship of 550ft x 80ft x 26ft with 6-12in/45 BLR and 8-6in QF guns. The 6in guns are in barbettes. The 12in guns are in two triple turrets, one forward and one aft. The armour basis is 6in with a 3in deck. The thick deck armour caused the displacement to be greater than planned: 18,100 tons normal rather than 16,860 tons. The speed is 25 knots, so it is almost a battlecruiser. This is the Springsharp report:
Ger/CA/1906, Germany Armoured Cruiser laid down 1906

Displacement:
 15,742 t light; 16,379 t standard; 18,100 t normal; 19,476 t full load

Dimensions: Length overall / water x beam x draught
 550.00 ft / 550.00 ft x 80.00 ft x 26.00 ft (normal load)
 167.64 m / 167.64 m x 24.38 m  x 7.92 m

Armament:
      6 - 12.00" / 305 mm guns (2x3 guns), 864.00lbs / 391.90kg shells, 1906 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1906 Model
   Quick firing guns in casemate mounts 
   on side, evenly spread
   8 guns in hull casemates - Limited use in heavy seas
 Weight of broadside 6,048 lbs / 2,743 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 420.00 ft / 128.02 m 16.00 ft / 4.88 m
 Ends: 4.00" / 102 mm 130.00 ft / 39.62 m 12.00 ft / 3.66 m
   Main Belt covers 117 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.60" / 41 mm 420.00 ft / 128.02 m 23.00 ft / 7.01 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 50,110 shp / 37,382 Kw = 25.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 3,097 tons

Complement:
 779 - 1,014

Cost:
 £1.642 million / $6.566 million

Distribution of weights at normal displacement:
 Armament: 756 tons, 4.2 %
 Armour: 5,071 tons, 28.0 %
    - Belts: 1,917 tons, 10.6 %
    - Torpedo bulkhead: 572 tons, 3.2 %
    - Armament: 782 tons, 4.3 %
    - Armour Deck: 1,710 tons, 9.4 %
    - Conning Tower: 89 tons, 0.5 %
 Machinery: 3,254 tons, 18.0 %
 Hull, fittings & equipment: 6,662 tons, 36.8 %
 Fuel, ammunition & stores: 2,358 tons, 13.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   24,208 lbs / 10,980 Kg = 28.0 x 12.0 " / 305 mm shells or 3.4 torpedoes
 Stability (Unstable if below 1.00): 1.24
 Metacentric height 5.3 ft / 1.6 m
 Roll period: 14.6 seconds
 Steadiness - As gun platform (Average = 50 %): 78 %
   - Recoil effect (Restricted arc if above 1.00): 0.60
 Seaboat quality  (Average = 1.00): 1.56

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.554
 Length to Beam Ratio: 6.88 : 1
 'Natural speed' for length: 23.45 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 %): 26.00 ft / 7.92 m
    - Mid (67 %):  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: 23.52 ft / 7.17 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 119.4 %
  - Above water (accommodation/working, high = better): 179.2 %
 Waterplane Area: 30,816 Square feet or 2,863 Square metres
 Displacement factor (Displacement / loading): 103 %
 Structure weight / hull surface area: 142 lbs/sq ft or 691 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.11
  - 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
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather

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