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Friday, September 15, 2006

The 2001 version of the Ger/CB/1906 design

I was amazed at how well the Ger/CB/1906 design worked. Admittedly, the machinery is lightweight, being 1910 technology. That means that the ship has 24.2 ton/SHP machinery. The ship has 8-12in/45 and 12-4in QF guns. The nominal Standard displacement of the original concept was 25,000 tons, which is achieved in this version. The speed is an aggressive 33 knots. I accepted a 15 knot cruising speed, which may be the reason why the design is workable. The ship is a very long 800ft, just a bit longer than the Renown and Repulse, in "real life". My 2001 drawing somewhat resembles the original version of those ships. This is the Springsharp report:
GGer/CB/1906 2001 version, Germany Battlecruiser laid down 1906 (Engine 1910)

Displacement:
 23,976 t light; 24,896 t standard; 27,500 t normal; 29,583 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, all amidships
 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 420.00 ft / 128.02 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 81 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.50" / 38 mm 420.00 ft / 128.02 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: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 163,892 shp / 122,263 Kw = 33.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 4,688 tons

Complement:
 1,067 - 1,388

Cost:
 £2.553 million / $10.214 million

Distribution of weights at normal displacement:
 Armament: 912 tons, 3.3 %
 Armour: 5,006 tons, 18.2 %
    - Belts: 1,242 tons, 4.5 %
    - Torpedo bulkhead: 583 tons, 2.1 %
    - Armament: 1,302 tons, 4.7 %
    - Armour Deck: 1,761 tons, 6.4 %
    - Conning Tower: 118 tons, 0.4 %
 Machinery: 6,772 tons, 24.6 %
 Hull, fittings & equipment: 11,286 tons, 41.0 %
 Fuel, ammunition & stores: 3,524 tons, 12.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   30,801 lbs / 13,971 Kg = 35.6 x 12.0 " / 305 mm shells or 3.4 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 5.5 ft / 1.7 m
 Roll period: 15.2 seconds
 Steadiness - As gun platform (Average = 50 %): 60 %
   - Recoil effect (Restricted arc if above 1.00): 0.62
 Seaboat quality  (Average = 1.00): 1.19

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.553
 Length to Beam Ratio: 9.41 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 52 %
 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:  33.00 ft / 10.06 m
    - Forecastle (20 %): 27.00 ft / 8.23 m
    - Mid (69 %):  27.00 ft / 8.23 m (19.00 ft / 5.79 m aft of break)
    - Quarterdeck (15 %): 19.00 ft / 5.79 m
    - Stern:  19.00 ft / 5.79 m
    - Average freeboard: 25.00 ft / 7.62 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 137.0 %
  - Above water (accommodation/working, high = better): 212.6 %
 Waterplane Area: 47,586 Square feet or 4,421 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 158 lbs/sq ft or 771 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.00
  - Longitudinal: 1.09
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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