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Friday, September 16, 2005

The September 8, 2001 version of the Ger/CB/1906 design

The oddest thing about the Ger/CB/1906 design is that due to its lightweight machinery, the design works well (except for having a belt that is too short, according to Springsharp). I used the armored citadel length from the 2001 drawing for the calculations. When I entered the design, originally with 1917 machinery, it had too much hull strength, so I changed the machinery date to 1914. I had to change it back, as it turns out that I had forgotten to enter the anti-torpedo bulkhead. After I entered the torpedo bulkhead, I had to reduce the range to 5,600 nm to reach the magic 1.00 composite strength. The dimensions used are 800ft x 85ft x 27ft, with a normal displacement of 25,000 tons. The speed is 33 knots. The armament is 8-12in/45 and 12-4in QF guns. The armor is a legacy of my thinking in 1971, where the belt was only 4in thick, in exchange for a 33 knot speed. This is the Springsharp report:
Ger/CB/1906, Germany Battlecruiser laid down 1906 (Engine 1917)

Displacement:
 22,547 t light; 23,394 t standard; 25,000 t normal; 26,285 t full load

Dimensions: Length overall / water x beam x draught
 801.00 ft / 800.00 ft x 85.00 ft x 27.00 ft (normal load)
 244.14 m / 243.84 m x 25.91 m  x 8.23 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 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1906 Model
   Quick firing guns in casemate mounts 
   on side, all amidships
 Weight of broadside 7,662 lbs / 3,475 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 425.00 ft / 129.54 m 17.00 ft / 5.18 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 26.00 ft / 7.92 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: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 149,293 shp / 111,373 Kw = 33.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 2,891 tons

Complement:
 993 - 1,292

Cost:
 £2.360 million / $9.439 million

Distribution of weights at normal displacement:
 Armament: 958 tons, 3.8 %
 Armour: 4,942 tons, 19.8 %
    - Belts: 1,250 tons, 5.0 %
    - Torpedo bulkhead: 613 tons, 2.5 %
    - Armament: 1,327 tons, 5.3 %
    - Armour Deck: 1,642 tons, 6.6 %
    - Conning Tower: 111 tons, 0.4 %
 Machinery: 5,473 tons, 21.9 %
 Hull, fittings & equipment: 11,174 tons, 44.7 %
 Fuel, ammunition & stores: 2,453 tons, 9.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   31,016 lbs / 14,068 Kg = 35.9 x 12.0 " / 305 mm shells or 3.6 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 5.1 ft / 1.5 m
 Roll period: 15.9 seconds
 Steadiness - As gun platform (Average = 50 %): 66 %
   - Recoil effect (Restricted arc if above 1.00): 0.73
 Seaboat quality  (Average = 1.00): 1.33

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.477
 Length to Beam Ratio: 9.41 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 50 %
 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:  31.00 ft / 9.45 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (67 %):  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: 25.60 ft / 7.80 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 130.2 %
  - Above water (accommodation/working, high = better): 219.4 %
 Waterplane Area: 44,367 Square feet or 4,122 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 162 lbs/sq ft or 791 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.29
  - 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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