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Sunday, August 05, 2007

The REAL original design for the Ger/BB/1909

This is the specification for the Ger/BB/1909 original design. I only realized what this specification was after doing the other version. This is the original specification:
BB 27,000 tons  9-12in/50 BLR and 8-6in QF guns
9in-13in belt, 24 knots
Dimensions: 640ft x 105ft x 26.9ft
Cp=0.54  Cm=0.97  63,000 SHP

Weights:
Hull:       12,300 tons
Armament:    1,345.5 tons
Machinery:   4,500 tons
Misc.:       2,160 tons
Protection:  6,694.5 tons

The actual Springsharp design has a lower standard displacement and higher speed for the power specified:
GB/BB/1909 original design, Germany Battleship laid down 1909

Displacement:
 24,718 t light; 25,769 t standard; 28,148 t normal; 30,052 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (640.00 ft / 640.00 ft) x 105.00 ft x (26.90 / 28.33 ft)
 (195.07 m / 195.07 m) x 32.00 m  x (8.20 / 8.63 m)

Armament:
      9 - 12.00" / 305 mm 50.0 cal guns - 915.00lbs / 415.04kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1909 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
      8 - 6.00" / 152 mm 50.0 cal guns - 114.00lbs / 51.71kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1909 Model
   8 x Single mounts on sides amidships
      Weight of broadside 9,147 lbs / 4,149 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.0" / 330 mm 400.00 ft / 121.92 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 9.00" / 229 mm 400.00 ft / 121.92 m 8.00 ft / 2.44 m
   Main Belt covers 96 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 400.00 ft / 121.92 m 26.90 ft / 8.20 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.0" / 330 mm 9.00" / 229 mm  13.0" / 330 mm
 2nd: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm

   - Armoured deck - multiple decks: 3.00" / 76 mm For and Aft decks
 Forecastle: 2.70" / 69 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 13.00" / 330 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 63,574 shp / 47,427 Kw = 25.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 4,283 tons

Complement:
 1,086 - 1,412

Cost:
 £2.220 million / $8.878 million

Distribution of weights at normal displacement:
 Armament: 1,896 tons, 6.7 %
 Armour: 9,123 tons, 32.4 %
    - Belts: 3,108 tons, 11.0 %
    - Torpedo bulkhead: 796 tons, 2.8 %
    - Armament: 2,405 tons, 8.5 %
    - Armour Deck: 2,554 tons, 9.1 %
    - Conning Tower: 259 tons, 0.9 %
 Machinery: 2,890 tons, 10.3 %
 Hull, fittings & equipment: 10,810 tons, 38.4 %
 Fuel, ammunition & stores: 3,430 tons, 12.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   54,241 lbs / 24,603 Kg = 62.8 x 12.0 " / 305 mm shells or 9.3 torpedoes
 Stability (Unstable if below 1.00): 1.25
 Metacentric height 8.0 ft / 2.4 m
 Roll period: 15.6 seconds
 Steadiness - As gun platform (Average = 50 %): 80 %
   - Recoil effect (Restricted arc if above 1.00): 0.46
 Seaboat quality  (Average = 1.00): 1.61

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.545 / 0.553
 Length to Beam Ratio: 6.10 : 1
 'Natural speed' for length: 25.30 kts
 Power going to wave formation at top speed: 49 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 35.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Forward deck: 35.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Aft deck: 15.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Quarter deck: 15.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Average freeboard:  25.60 ft / 7.80 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 79.2 %
  - Above water (accommodation/working, high = better): 209.6 %
 Waterplane Area: 46,679 Square feet or 4,337 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 178 lbs/sq ft or 871 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.91
  - 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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