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Monday, August 14, 2006

This is the Ger/BB/1907, from the Blue Booi, with adjusted weights

This is the Ger/BB/1907 design, tweaked to try and achieve the weights from the original specification. This is a ship with 8-12in/50 and 12-4in QF guns, and a 13in armour basis. The originally specified speed was 24 knots. I had followed closely the armour plan from the sketch. With that plan, the 7,547 tons protection is too light. The protection in the Springsharp design comes out heavier. This is the tweaked Springsharp design:
Ger/BB/1907, Germany Battleship laid down 1907

Displacement:
 23,316 t light; 24,254 t standard; 28,400 t normal; 31,717 t full load

Dimensions: Length overall / water x beam x draught
 620.00 ft / 620.00 ft x 105.00 ft x 26.00 ft (normal load)
 188.98 m / 188.98 m x 32.00 m  x 7.92 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1907 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, 1907 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: 13.0" / 330 mm 335.00 ft / 102.11 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 335.00 ft / 102.11 m 8.00 ft / 2.44 m
   Main Belt covers 83 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.50" / 38 mm 335.00 ft / 102.11 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.0" / 330 mm 8.00" / 203 mm  10.0" / 254 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 10.00" / 254 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 69,437 shp / 51,800 Kw = 25.30 kts
 Range 5,600nm at 18.00 kts
 Bunker at max displacement = 7,463 tons

Complement:
 1,093 - 1,422

Cost:
 £2.134 million / $8.538 million

Distribution of weights at normal displacement:
 Armament: 912 tons, 3.2 %
 Armour: 7,996 tons, 28.2 %
    - Belts: 2,605 tons, 9.2 %
    - Torpedo bulkhead: 465 tons, 1.6 %
    - Armament: 2,114 tons, 7.4 %
    - Armour Deck: 2,611 tons, 9.2 %
    - Conning Tower: 201 tons, 0.7 %
 Machinery: 3,945 tons, 13.9 %
 Hull, fittings & equipment: 10,463 tons, 36.8 %
 Fuel, ammunition & stores: 5,084 tons, 17.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   48,432 lbs / 21,969 Kg = 56.1 x 12.0 " / 305 mm shells or 7.5 torpedoes
 Stability (Unstable if below 1.00): 1.24
 Metacentric height 8.0 ft / 2.4 m
 Roll period: 15.6 seconds
 Steadiness - As gun platform (Average = 50 %): 67 %
   - Recoil effect (Restricted arc if above 1.00): 0.32
 Seaboat quality  (Average = 1.00): 1.34

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.587
 Length to Beam Ratio: 5.90 : 1
 'Natural speed' for length: 24.90 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:  29.00 ft / 8.84 m
    - Forecastle (20 %): 26.00 ft / 7.92 m
    - Mid (68 %):  26.00 ft / 7.92 m (18.00 ft / 5.49 m aft of break)
    - Quarterdeck (15 %): 18.00 ft / 5.49 m
    - Stern:  18.00 ft / 5.49 m
    - Average freeboard: 23.68 ft / 7.22 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 86.1 %
  - Above water (accommodation/working, high = better): 196.0 %
 Waterplane Area: 47,049 Square feet or 4,371 Square metres
 Displacement factor (Displacement / loading): 123 %
 Structure weight / hull surface area: 165 lbs/sq ft or 806 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.63
  - 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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