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Sunday, July 03, 2005

The Ger/CB/1912 with lower power

The lower power output version of the Ger/CB/1912 design works pretty well in Springsharp. This is the ship of which I have a photo. The design has 6-15in guns forward, in two triple turrets. The secondary armament of 8-6in QF guns is grouped around the forward superstructure, and is in shields. The armour basis is 6 inches. The design speed for a modest power is 32 knots. This is the Springsharp report:
Ger/CB/1912, Germany Battlecruiser laid down 1912 (Engine 1923)

Displacement:
 34,585 t light; 35,859 t standard; 39,000 t normal; 41,513 t full load

Dimensions: Length overall / water x beam x draught
 822.00 ft / 820.00 ft x 105.00 ft x 29.40 ft (normal load)
 250.55 m / 249.94 m x 32.00 m  x 8.96 m

Armament:
      6 - 15.00" / 381 mm guns (2x3 guns), 1,687.50lbs / 765.44kg shells, 1912 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on side, all forward, 2 raised mounts - superfiring
 Weight of broadside 10,989 lbs / 4,985 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 570.00 ft / 173.74 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 107 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 570.00 ft / 173.74 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 6.00" / 152 mm  10.0" / 254 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 5.00" / 127 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 181,614 shp / 135,484 Kw = 32.00 kts
 Range 6,500nm at 18.00 kts
 Bunker at max displacement = 5,653 tons

Complement:
 1,386 - 1,803

Cost:
 £3.214 million / $12.856 million

Distribution of weights at normal displacement:
 Armament: 1,374 tons, 3.5 %
 Armour: 11,200 tons, 28.7 %
    - Belts: 2,450 tons, 6.3 %
    - Torpedo bulkhead: 1,139 tons, 2.9 %
    - Armament: 1,910 tons, 4.9 %
    - Armour Deck: 5,502 tons, 14.1 %
    - Conning Tower: 198 tons, 0.5 %
 Machinery: 6,070 tons, 15.6 %
 Hull, fittings & equipment: 15,941 tons, 40.9 %
 Fuel, ammunition & stores: 4,415 tons, 11.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   59,178 lbs / 26,843 Kg = 35.1 x 15.0 " / 381 mm shells or 8.4 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 7.7 ft / 2.3 m
 Roll period: 15.9 seconds
 Steadiness - As gun platform (Average = 50 %): 63 %
   - Recoil effect (Restricted arc if above 1.00): 0.47
 Seaboat quality  (Average = 1.00): 1.26

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.539
 Length to Beam Ratio: 7.81 : 1
 'Natural speed' for length: 28.64 kts
 Power going to wave formation at top speed: 52 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  35.00 ft / 10.67 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (59 %):  30.00 ft / 9.14 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: 26.30 ft / 8.02 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 95.3 %
  - Above water (accommodation/working, high = better): 212.6 %
 Waterplane Area: 59,486 Square feet or 5,526 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 188 lbs/sq ft or 917 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.40
  - 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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