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Tuesday, May 30, 2006

The Ger/CB/1915 lives up to expectations

I am sure that the intent for the Ger/CB/1915, when I designed it, in the early 1970's, was to achieve a high speed. The main armament is grouped forward and the armoured citadel is short. The one deviation is that I am sure that the originally envisioned displacement was much lower than 40,455 tons standard. The armament is 6-16.5in BLR and 12-6in QF guns. The armour basis is 9in with a 3in deck and torpedo bulkhead. The speed is a nice 36 knots. This is the Springsharp report:
Ger/CB/1915, Germany Battlecruiser laid down 1915 (Engine 1937)

Displacement:
 38,850 t light; 40,455 t standard; 42,750 t normal; 44,586 t full load

Dimensions: Length overall / water x beam x draught
 901.73 ft / 900.00 ft x 100.00 ft x 30.00 ft (normal load)
 274.85 m / 274.32 m x 30.48 m  x 9.14 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, 1 raised mount - superfiring
      12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1915 Model
   Quick firing guns in turrets (on barbettes)
   on side, all aft
 Weight of broadside 14,772 lbs / 6,701 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 9.00" / 229 mm 420.00 ft / 128.02 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 72 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  3.00" / 76 mm 420.00 ft / 128.02 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 292,831 shp / 218,452 Kw = 36.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 4,132 tons

Complement:
 1,486 - 1,932

Cost:
 £5.887 million / $23.547 million

Distribution of weights at normal displacement:
 Armament: 1,847 tons, 4.3 %
 Armour: 10,159 tons, 23.8 %
    - Belts: 2,877 tons, 6.7 %
    - Torpedo bulkhead: 1,352 tons, 3.2 %
    - Armament: 2,194 tons, 5.1 %
    - Armour Deck: 3,500 tons, 8.2 %
    - Conning Tower: 237 tons, 0.6 %
 Machinery: 8,116 tons, 19.0 %
 Hull, fittings & equipment: 18,728 tons, 43.8 %
 Fuel, ammunition & stores: 3,900 tons, 9.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   52,051 lbs / 23,610 Kg = 23.2 x 16.5 " / 419 mm shells or 6.2 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 6.6 ft / 2.0 m
 Roll period: 16.3 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.70
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.554
 Length to Beam Ratio: 9.00 : 1
 'Natural speed' for length: 30.00 kts
 Power going to wave formation at top speed: 55 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (74 %):  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: 26.32 ft / 8.02 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 117.5 %
  - Above water (accommodation/working, high = better): 215.4 %
 Waterplane Area: 63,056 Square feet or 5,858 Square metres
 Displacement factor (Displacement / loading): 104 %
 Structure weight / hull surface area: 203 lbs/sq ft or 993 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.21
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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