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Monday, July 18, 2005

Sorry for yet another trip through the Ger/BB/1905

I have two pages about the Ger/BB/1905 design that warrant a new effort with Springsharp. On eis a detailed armor specification and the other is a cross section. The ship was specified at 580ft x 90ft x 26.6ft and a normal displacement of 22,000 tons. The armament was 8-12in/45 and 12-4in QF guns. The armor basis was 10in. This time, the Springsharp design was easy to make work, and I was able to add range to what I had originally guessed. I decided it was too easy and changed the engines to a 1905 date. That meant reducing the capabilities. The result is a slower cruising speed and a very short range. The good news is that other capabilities were as specicified:
Ger/BB/1905, Germany Battleship laid down 1905

Displacement:
 20,205 t light; 20,953 t standard; 22,000 t normal; 22,837 t full load

Dimensions: Length overall / water x beam x draught
 580.00 ft / 580.00 ft x 90.00 ft x 26.60 ft (normal load)
 176.78 m / 176.78 m x 27.43 m  x 8.11 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1905 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, 1905 Model
   Quick firing guns in casemate mounts 
   on side, all amidships
 Weight of broadside 7,296 lbs / 3,309 kg
 Shells per gun, main battery: 75

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.0" / 254 mm 390.00 ft / 118.87 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 103 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 390.00 ft / 118.87 m 22.00 ft / 6.71 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 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: 11.00" / 279 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 40,473 shp / 30,193 Kw = 23.00 kts
 Range 3,600nm at 12.00 kts
 Bunker at max displacement = 1,884 tons

Complement:
 903 - 1,174

Cost:
 £1.903 million / $7.610 million

Distribution of weights at normal displacement:
 Armament: 912 tons, 4.1 %
 Armour: 7,357 tons, 33.4 %
    - Belts: 2,699 tons, 12.3 %
    - Torpedo bulkhead: 317 tons, 1.4 %
    - Armament: 2,124 tons, 9.7 %
    - Armour Deck: 2,030 tons, 9.2 %
    - Conning Tower: 186 tons, 0.8 %
 Machinery: 3,066 tons, 13.9 %
 Hull, fittings & equipment: 8,870 tons, 40.3 %
 Fuel, ammunition & stores: 1,795 tons, 8.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   32,993 lbs / 14,965 Kg = 38.2 x 12.0 " / 305 mm shells or 4.8 torpedoes
 Stability (Unstable if below 1.00): 1.05
 Metacentric height 4.7 ft / 1.4 m
 Roll period: 17.4 seconds
 Steadiness - As gun platform (Average = 50 %): 93 %
   - Recoil effect (Restricted arc if above 1.00): 0.88
 Seaboat quality  (Average = 1.00): 1.86

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.555
 Length to Beam Ratio: 6.44 : 1
 'Natural speed' for length: 24.08 kts
 Power going to wave formation at top speed: 47 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -1.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  30.00 ft / 9.14 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (70 %):  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: 25.76 ft / 7.85 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 98.1 %
  - Above water (accommodation/working, high = better): 201.8 %
 Waterplane Area: 36,586 Square feet or 3,399 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 163 lbs/sq ft or 798 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.09
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 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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