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Tuesday, August 14, 2007

Another Ger/CB/1912 version

Late in the Blue Book, there is another specification for the Ger/CB/1912 design. This version works extremely well in Springsharp 3.0b2 Beta. There are some questions that are unanswered, so I took artistic license to make up the missing pieces. This is what one of the ships looks like:

This is a fast ship with 6-15in guns and a speed of 35 knots, in this version:
Ger/CB/1912, Germany Battlecruiser laid down 1912 (Engine 1941)

Displacement:
 37,864 t light; 39,459 t standard; 41,948 t normal; 43,939 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (824.00 ft / 820.00 ft) x 105.00 ft x (29.40 / 30.53 ft)
 (251.16 m / 249.94 m) x 32.00 m  x (8.96 / 9.30 m)

Armament:
      6 - 15.00" / 381 mm 45.0 cal guns - 1,700.00lbs / 771.11kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts, 1912 Model
   2 x Triple mounts on centreline, forward deck 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, 1912 Model
   8 x Single mounts on sides, forward deck aft
  2 raised mounts - superfiring
      Weight of broadside 11,112 lbs / 5,040 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 400.00 ft / 121.92 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 75 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 400.00 ft / 121.92 m 29.40 ft / 8.96 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 6.00" / 152 mm  10.0" / 254 mm
 2nd: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 9.00" / 229 mm For and Aft decks

   - Conning towers: Forward 8.00" / 203 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 278,113 shp / 207,472 Kw = 35.00 kts
 Range 7,500nm at 16.00 kts
 Bunker at max displacement = 4,479 tons

Complement:
 1,465 - 1,905

Cost:
 £3.402 million / $13.609 million

Distribution of weights at normal displacement:
 Armament: 1,964 tons, 4.7 %
 Armour: 12,459 tons, 29.7 %
    - Belts: 1,730 tons, 4.1 %
    - Torpedo bulkhead: 870 tons, 2.1 %
    - Armament: 1,975 tons, 4.7 %
    - Armour Deck: 7,675 tons, 18.3 %
    - Conning Tower: 208 tons, 0.5 %
 Machinery: 7,350 tons, 17.5 %
 Hull, fittings & equipment: 16,092 tons, 38.4 %
 Fuel, ammunition & stores: 4,084 tons, 9.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   62,710 lbs / 28,445 Kg = 37.2 x 15.0 " / 381 mm shells or 8.0 torpedoes
 Stability (Unstable if below 1.00): 1.23
 Metacentric height 7.8 ft / 2.4 m
 Roll period: 15.7 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.45
 Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.580 / 0.585
 Length to Beam Ratio: 7.81 : 1
 'Natural speed' for length: 28.64 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 4.00 ft / 1.22 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 30.00 %,  37.00 ft / 11.28 m,  32.00 ft / 9.75 m
    - Forward deck: 30.00 %,  32.00 ft / 9.75 m,  31.00 ft / 9.45 m
    - Aft deck: 25.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Quarter deck: 15.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Average freeboard:  28.85 ft / 8.79 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 99.1 %
  - Above water (accommodation/working, high = better): 222.1 %
 Waterplane Area: 61,804 Square feet or 5,742 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 188 lbs/sq ft or 919 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.51
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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