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Friday, September 29, 2006

The Ger/CB/1906 design comes out heavy

The Ger/CB/1906 design is very agressive. The design does a lot to shorten the armoured citadel, and to achieve a very high speed for a large ship laid down in 1906. The side armour is thin, 4in, but the deck is a rather thick 3in. The turret faces and barbettes are 6in. The ship is trying to carry 8-12in guns at 33 knots. The ship is an all-around better ship than its opponent, the GB/CB/1905 design. Optimistically, I had hoped for an overload speed of 36 knots, in 1971. This is the Springsharp report, for the version with coal-fired boilers:
Ger/CB/1906 Coal-fired boilers, Germany Battlecruiser laid down 1906 (Engine 1919)

Displacement:
    24,890 t light; 25,828 t standard; 28,400 t normal; 30,458 t full load

Dimensions: Length overall / water x beam x draught
    800.00 ft / 800.00 ft x 85.00 ft x 25.60 ft (normal load)
    243.84 m / 243.84 m x 25.91 m  x 7.80 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1906 Model
      Breech loading guns in turrets (on barbettes)
      on centreline ends, evenly spread, 2 raised mounts - superfiring
      12 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1906 Model
      Quick firing guns in deck mounts with hoists
      on side, evenly spread
    Weight of broadside 7,296 lbs / 3,309 kg
    Shells per gun, main battery: 90

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    4.00" / 102 mm    425.00 ft / 129.54 m    16.00 ft / 4.88 m
    Ends:    Unarmoured
      Main Belt covers 82 % of normal length
      Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
        1.50" / 38 mm    425.00 ft / 129.54 m    25.00 ft / 7.62 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:    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:
    Coal fired boilers, steam turbines,
    Direct drive, 4 shafts, 168,506 shp / 125,706 Kw = 33.00 kts
    Range 6,500nm at 15.00 kts
    Bunker at max displacement = 4,630 tons (100% coal)

Complement:
    1,093 - 1,422

Cost:
    £2.559 million / $10.235 million

Distribution of weights at normal displacement:
    Armament: 912 tons, 3.2 %
    Armour: 5,914 tons, 20.8 %
       - Belts: 1,181 tons, 4.2 %
       - Torpedo bulkhead: 590 tons, 2.1 %
       - Armament: 1,337 tons, 4.7 %
       - Armour Deck: 2,686 tons, 9.5 %
       - Conning Tower: 120 tons, 0.4 %
    Machinery: 6,582 tons, 23.2 %
    Hull, fittings & equipment: 11,481 tons, 40.4 %
    Fuel, ammunition & stores: 3,510 tons, 12.4 %
    Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      35,355 lbs / 16,037 Kg = 40.9 x 12.0 " / 305 mm shells or 3.9 torpedoes
    Stability (Unstable if below 1.00): 1.19
    Metacentric height 5.4 ft / 1.6 m
    Roll period: 15.4 seconds
    Steadiness    - As gun platform (Average = 50 %): 60 %
            - Recoil effect (Restricted arc if above 1.00): 0.66
    Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
    Hull has rise forward of midbreak
    Block coefficient: 0.571
    Length to Beam Ratio: 9.41 : 1
    'Natural speed' for length: 28.28 kts
    Power going to wave formation at top speed: 53 %
    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:        32.00 ft / 9.75 m
       - Forecastle (20 %):    28.00 ft / 8.53 m
       - Mid (69 %):        28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
       - Quarterdeck (15 %):    20.00 ft / 6.10 m
       - Stern:        20.00 ft / 6.10 m
       - Average freeboard:    25.84 ft / 7.88 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 129.9 %
        - Above water (accommodation/working, high = better): 219.6 %
    Waterplane Area: 48,401 Square feet or 4,497 Square metres
    Displacement factor (Displacement / loading): 108 %
    Structure weight / hull surface area: 157 lbs/sq ft or 769 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.99
        - Longitudinal: 1.13
        - Overall: 1.00
    Hull space for machinery, storage, compartmentation is cramped
    Room for accommodation and workspaces is excellent
    Good seaboat, rides out heavy weather easily

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