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Thursday, September 15, 2005

The September 8, 2001 version of the Ger/BB/1909 design

The Ger/BB/1909 drawing from September 8, 2001 is not very inspired, but it does look distinctly like a WWI-era German battleship. Partly, the problem is that three triple 12in gun turrets dow't seem very appropriate for such a ship. This drawing has some specifications, so I needed to invent less for Springsharp. The design, as originally entered allowed for room for growth, so I increased the range and deck armor. This is the Springsharp report:
Ger/BB/1909, Germany Battleship laid down 1909

Displacement:
 26,686 t light; 27,692 t standard; 30,760 t normal; 33,214 t full load

Dimensions: Length overall / water x beam x draught
 645.00 ft / 645.00 ft x 106.00 ft x 30.00 ft (normal load)
 196.60 m / 196.60 m x 32.31 m  x 9.14 m

Armament:
      9 - 12.00" / 305 mm guns (3x3 guns), 864.00lbs / 391.90kg shells, 1909 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1909 Model
   Quick firing guns in casemate mounts 
   on side, all amidships
 Weight of broadside 8,640 lbs / 3,919 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 14.0" / 356 mm 350.00 ft / 106.68 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 83 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 350.00 ft / 106.68 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 9.00" / 229 mm  14.0" / 356 mm
 2nd: 6.00" / 152 mm 6.00" / 152 mm  6.00" / 152 mm

   - Armour deck: 4.50" / 114 mm, Conning tower: 14.00" / 356 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 47,943 shp / 35,765 Kw = 23.00 kts
 Range 7,000nm at 15.00 kts
 Bunker at max displacement = 5,522 tons

Complement:
 1,160 - 1,509

Cost:
 £2.146 million / $8.585 million

Distribution of weights at normal displacement:
 Armament: 1,080 tons, 3.5 %
 Armour: 11,879 tons, 38.6 %
    - Belts: 3,813 tons, 12.4 %
    - Torpedo bulkhead: 1,127 tons, 3.7 %
    - Armament: 2,764 tons, 9.0 %
    - Armour Deck: 3,880 tons, 12.6 %
    - Conning Tower: 296 tons, 1.0 %
 Machinery: 2,179 tons, 7.1 %
 Hull, fittings & equipment: 11,548 tons, 37.5 %
 Fuel, ammunition & stores: 4,074 tons, 13.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   69,229 lbs / 31,402 Kg = 80.1 x 12.0 " / 305 mm shells or 14.4 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 7.1 ft / 2.2 m
 Roll period: 16.7 seconds
 Steadiness - As gun platform (Average = 50 %): 98 %
   - Recoil effect (Restricted arc if above 1.00): 0.50
 Seaboat quality  (Average = 1.00): 1.96

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.525
 Length to Beam Ratio: 6.08 : 1
 'Natural speed' for length: 25.40 kts
 Power going to wave formation at top speed: 44 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (63 %):  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: 25.28 ft / 7.71 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 61.6 %
  - Above water (accommodation/working, high = better): 193.6 %
 Waterplane Area: 46,609 Square feet or 4,330 Square metres
 Displacement factor (Displacement / loading): 124 %
 Structure weight / hull surface area: 175 lbs/sq ft or 853 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 2.00
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather

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