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Sunday, October 21, 2007

A Ger/BB/1905 variant design

I had skipped over this, but I thought that I would try this variant design for the Ger/BB/1905 specification. The ship has the forward turret sited further aft and the after turret much closer to the stern than the classic version. This photograph actually has the correct dimensions. The ship was intended to be a 22,000 ton battleship with 8-12in/BLR, 12-4in QF guns and a speed of 23 knots. The lower belt is 11in. This is the Springsharp report:
Ger/BB/1905 variant, Germany Battleship laid down 1905

Displacement:
 20,360 t light; 21,219 t standard; 23,922 t normal; 26,085 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (585.00 ft / 580.00 ft) x 90.00 ft x (26.60 / 28.58 ft)
 (178.31 m / 176.78 m) x 27.43 m  x (8.11 / 8.71 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.00lbs / 395.08kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1905 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      12 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1905 Model
   12 x Single mounts on sides, evenly spread
      Weight of broadside 7,355 lbs / 3,336 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 11.0" / 279 mm 370.00 ft / 112.78 m 8.00 ft / 2.44 m
 Ends: 4.00" / 102 mm 170.00 ft / 51.82 m 16.00 ft / 4.88 m
   40.00 ft / 12.19 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 380.00 ft / 115.82 m 26.60 ft / 8.11 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 11.0" / 279 mm 6.00" / 152 mm  11.0" / 279 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

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

   - Conning towers: Forward 11.00" / 279 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 43,412 shp / 32,386 Kw = 23.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 4,866 tons

Complement:
 961 - 1,250

Cost:
 £1.842 million / $7.370 million

Distribution of weights at normal displacement:
 Armament: 1,308 tons, 5.5 %
 Armour: 7,829 tons, 32.7 %
    - Belts: 2,871 tons, 12.0 %
    - Torpedo bulkhead: 748 tons, 3.1 %
    - Armament: 1,872 tons, 7.8 %
    - Armour Deck: 2,141 tons, 8.9 %
    - Conning Tower: 197 tons, 0.8 %
 Machinery: 3,289 tons, 13.7 %
 Hull, fittings & equipment: 7,934 tons, 33.2 %
 Fuel, ammunition & stores: 3,562 tons, 14.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   37,217 lbs / 16,881 Kg = 43.1 x 12.0 " / 305 mm shells or 6.0 torpedoes
 Stability (Unstable if below 1.00): 1.22
 Metacentric height 6.1 ft / 1.9 m
 Roll period: 15.3 seconds
 Steadiness - As gun platform (Average = 50 %): 78 %
   - Recoil effect (Restricted arc if above 1.00): 0.55
 Seaboat quality  (Average = 1.00): 1.56

Hull form characteristics:
 Hull has rise forward of midbreak,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.603 / 0.612
 Length to Beam Ratio: 6.44 : 1
 'Natural speed' for length: 24.08 kts
 Power going to wave formation at top speed: 48 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 30.00 %,  27.00 ft / 8.23 m,  25.00 ft / 7.62 m
    - Forward deck: 32.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Aft deck: 23.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Quarter deck: 15.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Average freeboard:  22.20 ft / 6.77 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 90.5 %
  - Above water (accommodation/working, high = better): 164.3 %
 Waterplane Area: 38,285 Square feet or 3,557 Square metres
 Displacement factor (Displacement / loading): 115 %
 Structure weight / hull surface area: 155 lbs/sq ft or 759 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.63
  - 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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