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Wednesday, November 07, 2007

The Ger/BB/1915 design

The Ger/BB/1915 design is one where I greatly underestimated the speed that was possible with the specified power. This is a 750ft long ship of about 60,000 tons. The armament is 9-18 and 24-5in guns. The power was specified as 120,000 SHP, but the 26 knots is what Springsharp says is the top speed for that power. I had thought it would only make 20 knots. This is a much better ship than I had thought possible:
Ger/BB/1915, Germany Battleship laid down 1915 (Engine 1941)

Displacement:
 56,211 t light; 59,010 t standard; 61,470 t normal; 63,437 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (758.84 ft / 750.00 ft) x 130.00 ft x (34.00 / 34.92 ft)
 (231.30 m / 228.60 m) x 39.62 m  x (10.36 / 10.64 m)

Armament:
      9 - 18.00" / 457 mm 45.0 cal guns - 3,200.00lbs / 1,451.50kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1915 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
      24 - 5.00" / 127 mm 50.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1915 Model
   12 x Twin mounts on sides, forward deck aft
      Weight of broadside 30,360 lbs / 13,771 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 18.0" / 457 mm 400.00 ft / 121.92 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 82 % of normal length

   - Torpedo Bulkhead:
  8.00" / 203 mm 400.00 ft / 121.92 m 34.00 ft / 10.36 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 18.0" / 457 mm 12.0" / 305 mm  18.0" / 457 mm
 2nd: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm

   - Armoured deck - multiple decks: 6.00" / 152 mm For and Aft decks
 Forecastle: 6.00" / 152 mm  Quarter deck: 6.00" / 152 mm

   - Conning towers: Forward 18.00" / 457 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 119,142 shp / 88,880 Kw = 26.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 4,427 tons

Complement:
 1,951 - 2,537

Cost:
 £7.334 million / $29.337 million

Distribution of weights at normal displacement:
 Armament: 4,501 tons, 7.3 %
 Armour: 25,361 tons, 41.3 %
    - Belts: 5,760 tons, 9.4 %
    - Torpedo bulkhead: 4,026 tons, 6.5 %
    - Armament: 6,622 tons, 10.8 %
    - Armour Deck: 8,350 tons, 13.6 %
    - Conning Tower: 604 tons, 1.0 %
 Machinery: 3,149 tons, 5.1 %
 Hull, fittings & equipment: 23,200 tons, 37.7 %
 Fuel, ammunition & stores: 5,259 tons, 8.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   115,696 lbs / 52,479 Kg = 39.7 x 18.0 " / 457 mm shells or 27.5 torpedoes
 Stability (Unstable if below 1.00): 1.23
 Metacentric height 10.8 ft / 3.3 m
 Roll period: 16.6 seconds
 Steadiness - As gun platform (Average = 50 %): 68 %
   - Recoil effect (Restricted arc if above 1.00): 0.59
 Seaboat quality  (Average = 1.00): 1.35

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.649 / 0.652
 Length to Beam Ratio: 5.77 : 1
 'Natural speed' for length: 27.39 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 15.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  33.00 ft / 10.06 m,  29.00 ft / 8.84 m
    - Forward deck: 30.00 %,  29.00 ft / 8.84 m,  25.00 ft / 7.62 m
    - Aft deck: 35.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Quarter deck: 15.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Average freeboard:  26.72 ft / 8.14 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 66.1 %
  - Above water (accommodation/working, high = better): 188.9 %
 Waterplane Area: 74,622 Square feet or 6,933 Square metres
 Displacement factor (Displacement / loading): 108 %
 Structure weight / hull surface area: 249 lbs/sq ft or 1,214 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.77
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

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