Amazon Ad

Monday, July 31, 2006

From the original high-level specification for the Ger/BB/1905 in the Blue Book

We have finished a pass through the Red Book and I am now going through the Blue Book. I am starting with the original high level specifications for the ships in the German 1905 building program. The first are the four battleships to be built in 1905, which were 580ft x 90ft x 26.6ft, with a Standard displacement of 22,000 tons, 8-12in/45 BLR and 12-4in QF guns. The belt is specified to be 10in. The speed wanted is 23 knots. I am using normal weight machinery. All boilers are oil-fired. This is the Springsharp report:
Ger/BB/1905, Germany Battleship laid down 1905

Displacement:
 20,998 t light; 21,870 t standard; 25,100 t normal; 27,684 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: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.0" / 254 mm 370.00 ft / 112.78 m 8.00 ft / 2.44 m
 Ends: 4.00" / 102 mm 130.00 ft / 39.62 m 8.00 ft / 2.44 m
   80.00 ft / 24.38 m Unarmoured ends
 Upper: 8.00" / 203 mm 370.00 ft / 112.78 m 8.00 ft / 2.44 m
   Main Belt covers 98 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 370.00 ft / 112.78 m 26.00 ft / 7.92 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 11.0" / 279 mm 8.00" / 203 mm  11.0" / 279 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 11.00" / 279 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 45,227 shp / 33,739 Kw = 23.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 5,814 tons

Complement:
 996 - 1,296

Cost:
 £1.981 million / $7.923 million

Distribution of weights at normal displacement:
 Armament: 912 tons, 3.6 %
 Armour: 7,782 tons, 31.0 %
    - Belts: 2,496 tons, 9.9 %
    - Torpedo bulkhead: 712 tons, 2.8 %
    - Armament: 2,187 tons, 8.7 %
    - Armour Deck: 2,184 tons, 8.7 %
    - Conning Tower: 203 tons, 0.8 %
 Machinery: 3,426 tons, 13.7 %
 Hull, fittings & equipment: 8,878 tons, 35.4 %
 Fuel, ammunition & stores: 4,102 tons, 16.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   38,109 lbs / 17,286 Kg = 44.1 x 12.0 " / 305 mm shells or 5.9 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 5.3 ft / 1.6 m
 Roll period: 16.4 seconds
 Steadiness - As gun platform (Average = 50 %): 80 %
   - Recoil effect (Restricted arc if above 1.00): 0.64
 Seaboat quality  (Average = 1.00): 1.60

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.633
 Length to Beam Ratio: 6.44 : 1
 'Natural speed' for length: 24.08 kts
 Power going to wave formation at top speed: 49 %
 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 (67 %):  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: 23.60 ft / 7.19 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 92.6 %
  - Above water (accommodation/working, high = better): 179.0 %
 Waterplane Area: 39,356 Square feet or 3,656 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 158 lbs/sq ft or 771 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.73
  - 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

No comments:

Amazon Context Links