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Saturday, July 02, 2005

The redesigned Ger/CB/1911 looks like a super-ship

The next design to reconsider was the Ger/CB/1911 battlecruiser. This is a flush-decked ship with two triple-12in/50 BLR turrets forward and 8-6in QF guns in shields, arrayed next to, and on, the forward superstructure. The belt is just 6 inches but the deck armour is 5 inches. The turrets and barbettes are 8 inches. In this case, I had underestimated what could be done on a given displacement (35,000 tons). I had decided that I could have 40 SHP/ton machinery, although my Springsharp design has lower power output machinery than that, although with a much greater power than originally planned. The new design can reach 34 knots on just a 34,500 ton displacement. This is the Springsharp report:
Ger/CB/1911, Germany Battlecruiser laid down 1911 (Engine 1927)

Displacement:
 29,388 t light; 30,073 t standard; 34,250 t normal; 37,592 t full load

Dimensions: Length overall / water x beam x draught
 751.00 ft / 750.00 ft x 100.00 ft x 30.10 ft (normal load)
 228.90 m / 228.60 m x 30.48 m  x 9.17 m

Armament:
      6 - 12.00" / 305 mm guns (2x3 guns), 864.00lbs / 391.90kg shells, 1911 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, 1911 Model
   Quick firing guns in deck mounts with hoists
   on side, all forward, 2 raised mounts - superfiring
 Weight of broadside 6,048 lbs / 2,743 kg
 Shells per gun, main battery: 0

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 540.00 ft / 164.59 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 111 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 540.00 ft / 164.59 m 28.00 ft / 8.53 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 6.00" / 152 mm  8.00" / 203 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, 221,820 shp / 165,478 Kw = 34.00 kts
 Range 10,000nm at 18.00 kts
 Bunker at max displacement = 7,519 tons

Complement:
 1,258 - 1,636

Cost:
 £2.644 million / $10.575 million

Distribution of weights at normal displacement:
 Armament: 756 tons, 2.2 %
 Armour: 9,460 tons, 27.6 %
    - Belts: 2,312 tons, 6.8 %
    - Torpedo bulkhead: 1,119 tons, 3.3 %
    - Armament: 1,090 tons, 3.2 %
    - Armour Deck: 4,756 tons, 13.9 %
    - Conning Tower: 182 tons, 0.5 %
 Machinery: 7,002 tons, 20.4 %
 Hull, fittings & equipment: 12,170 tons, 35.5 %
 Fuel, ammunition & stores: 4,862 tons, 14.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   49,322 lbs / 22,372 Kg = 57.1 x 12.0 " / 305 mm shells or 6.8 torpedoes
 Stability (Unstable if below 1.00): 1.31
 Metacentric height 8.1 ft / 2.5 m
 Roll period: 14.7 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.26
 Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.531
 Length to Beam Ratio: 7.50 : 1
 'Natural speed' for length: 27.39 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -1.00 degrees
 Stern overhang: 1.00 ft / 0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  34.00 ft / 10.36 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (50 %):  25.00 ft / 7.62 m
    - Quarterdeck (15 %): 25.00 ft / 7.62 m
    - Stern:  25.00 ft / 7.62 m
    - Average freeboard: 25.72 ft / 7.84 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 103.0 %
  - Above water (accommodation/working, high = better): 194.6 %
 Waterplane Area: 51,421 Square feet or 4,777 Square metres
 Displacement factor (Displacement / loading): 116 %
 Structure weight / hull surface area: 162 lbs/sq ft or 791 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.52
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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