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Friday, June 30, 2006

The Ger/CB/1915A is an odd-looking ship

The Ger/CB/1915A battlecruiser is odd-looking, as drawn in my old pencil sketch. The ship has a tower mast, two large funnels, and a mainmast set forward of the aft funnel. The main armament is in two turrets forward, with the secondary armament in turrets grouped amidships. The hull is flush decked and has a flared bow. There is this large, empty expanse aft. I had dreams of reaching ridiculously high speeds with the 961ft length on just 269,000 SHP. The reality is that the Springsharp design can reach 34 knots. The displacement is about 5,000 tons greater than I had hoped would work. This is the Springsharp report:
Ger/CB/1915A, Germany Battlecruiser laid down 1915 (Engine 1941)

Displacement:
 50,367 t light; 52,206 t standard; 54,500 t normal; 56,335 t full load

Dimensions: Length overall / water x beam x draught
 964.06 ft / 961.00 ft x 110.00 ft x 31.70 ft (normal load)
 293.85 m / 292.91 m x 33.53 m  x 9.66 m

Armament:
      6 - 16.50" / 419 mm guns (2x3 guns), 2,246.06lbs / 1,018.80kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward
      20 - 5.00" / 127 mm guns (10x2 guns), 62.50lbs / 28.35kg shells, 1915 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 6 raised mounts - superfiring
 Weight of broadside 14,726 lbs / 6,680 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 500.00 ft / 152.40 m 19.00 ft / 5.79 m
 Ends: Unarmoured
   Main Belt covers 80 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  7.00" / 178 mm 500.00 ft / 152.40 m 31.00 ft / 9.45 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 9.00" / 229 mm  12.0" / 305 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 6.00" / 152 mm, Conning tower: 12.00" / 305 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 267,463 shp / 199,527 Kw = 34.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 4,130 tons

Complement:
 1,783 - 2,318

Cost:
 £6.253 million / $25.010 million

Distribution of weights at normal displacement:
 Armament: 1,841 tons, 3.4 %
 Armour: 20,794 tons, 38.2 %
    - Belts: 5,019 tons, 9.2 %
    - Torpedo bulkhead: 4,015 tons, 7.4 %
    - Armament: 3,051 tons, 5.6 %
    - Armour Deck: 8,338 tons, 15.3 %
    - Conning Tower: 372 tons, 0.7 %
 Machinery: 7,068 tons, 13.0 %
 Hull, fittings & equipment: 20,664 tons, 37.9 %
 Fuel, ammunition & stores: 4,133 tons, 7.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   88,502 lbs / 40,144 Kg = 39.4 x 16.5 " / 419 mm shells or 15.8 torpedoes
 Stability (Unstable if below 1.00): 1.24
 Metacentric height 8.5 ft / 2.6 m
 Roll period: 15.8 seconds
 Steadiness - As gun platform (Average = 50 %): 60 %
   - Recoil effect (Restricted arc if above 1.00): 0.41
 Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.569
 Length to Beam Ratio: 8.74 : 1
 'Natural speed' for length: 31.00 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  35.00 ft / 10.67 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (50 %):  25.00 ft / 7.62 m
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 25.80 ft / 7.86 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 83.1 %
  - Above water (accommodation/working, high = better): 200.6 %
 Waterplane Area: 75,117 Square feet or 6,979 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 196 lbs/sq ft or 955 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.00
  - Longitudinal: 1.03
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent

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