Amazon Ad

Sunday, July 03, 2005

The higher power output version of the Ger/CB/1912 design can make 35 knots

The more radical recasting of the Ger/CB/1912 design can make 35 knots. I had thought that I would use 40 SHP/ton of machinery weight, although this is not that light, although it is 36 SHP/ton. To keep from having to balloon the displacement too much, I increased the draught, as this is a relatively cheap way to increase strength in Springsharp. This is the revised Springsharp report:
Ger/CB/1912, Germany Battlecruiser laid down 1912 (Engine 1937)

Displacement:
 35,706 t light; 36,996 t standard; 39,750 t normal; 41,953 t full load

Dimensions: Length overall / water x beam x draught
 822.00 ft / 820.00 ft x 105.00 ft x 33.00 ft (normal load)
 250.55 m / 249.94 m x 32.00 m  x 10.06 m

Armament:
      6 - 15.00" / 381 mm guns (2x3 guns), 1,687.50lbs / 765.44kg shells, 1912 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on side, all forward, 2 raised mounts - superfiring
 Weight of broadside 10,989 lbs / 4,985 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 560.00 ft / 170.69 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 105 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 560.00 ft / 170.69 m 28.00 ft / 8.53 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: 2.00" / 51 mm       -         -

   - Armour deck: 5.00" / 127 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 256,152 shp / 191,089 Kw = 35.00 kts
 Range 6,500nm at 18.00 kts
 Bunker at max displacement = 4,957 tons

Complement:
 1,406 - 1,829

Cost:
 £3.397 million / $13.590 million

Distribution of weights at normal displacement:
 Armament: 1,374 tons, 3.5 %
 Armour: 10,935 tons, 27.5 %
    - Belts: 2,407 tons, 6.1 %
    - Torpedo bulkhead: 1,160 tons, 2.9 %
    - Armament: 1,910 tons, 4.8 %
    - Armour Deck: 5,257 tons, 13.2 %
    - Conning Tower: 201 tons, 0.5 %
 Machinery: 7,100 tons, 17.9 %
 Hull, fittings & equipment: 16,298 tons, 41.0 %
 Fuel, ammunition & stores: 4,044 tons, 10.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   53,097 lbs / 24,084 Kg = 31.5 x 15.0 " / 381 mm shells or 7.1 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 7.4 ft / 2.2 m
 Roll period: 16.3 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.46
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.490
 Length to Beam Ratio: 7.81 : 1
 'Natural speed' for length: 28.64 kts
 Power going to wave formation at top speed: 56 %
 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 (% = measuring location as a percentage of overall length):
    - Stem:  35.00 ft / 10.67 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (59 %):  30.00 ft / 9.14 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: 26.30 ft / 8.02 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 103.7 %
  - Above water (accommodation/working, high = better): 200.2 %
 Waterplane Area: 56,832 Square feet or 5,280 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 194 lbs/sq ft or 947 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.58
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

No comments:

Amazon Context Links