Amazon Ad

Monday, June 19, 2006

An alternative design for the GB/CB/1905 battlecruiser

This is greatly superior to what my friend Cliff decided to actually use in his building program. This design is closer to what Frank Fox and David K. Brown had advocated. The armament is 6-12in BLR and 9-6in QF guns, two more than the GB/CB/1905 had. The belt is 6in, instead of 4in, and I suppose that the better ship is made possible by 30 SHP/ton machinery. This is the Springsharp report:
GB/CB/1905 Alt Red Book, Great Britain Battlecruiser laid down 1905 (Engine 1927)

Displacement:
 23,216 t light; 24,068 t standard; 26,800 t normal; 28,986 t full load

Dimensions: Length overall / water x beam x draught
 770.00 ft / 770.00 ft x 85.00 ft x 27.00 ft (normal load)
 234.70 m / 234.70 m x 25.91 m  x 8.23 m

Armament:
      6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      1 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
   Quick firing gun in a deck mount with hoist
   on centreline aft, 1 raised gun
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
   Quick firing guns in deck mounts with hoists
   on side, evenly spread
 Weight of broadside 6,156 lbs / 2,792 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 460.00 ft / 140.21 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 92 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 460.00 ft / 140.21 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 4.00" / 102 mm  8.00" / 203 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 10.00" / 254 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 162,539 shp / 121,254 Kw = 33.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 4,918 tons

Complement:
 1,046 - 1,361

Cost:
 £2.177 million / $8.709 million

Distribution of weights at normal displacement:
 Armament: 770 tons, 2.9 %
 Armour: 6,675 tons, 24.9 %
    - Belts: 1,884 tons, 7.0 %
    - Torpedo bulkhead: 919 tons, 3.4 %
    - Armament: 1,189 tons, 4.4 %
    - Armour Deck: 2,490 tons, 9.3 %
    - Conning Tower: 193 tons, 0.7 %
 Machinery: 5,131 tons, 19.1 %
 Hull, fittings & equipment: 10,641 tons, 39.7 %
 Fuel, ammunition & stores: 3,584 tons, 13.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   39,149 lbs / 17,758 Kg = 45.3 x 12.0 " / 305 mm shells or 5.0 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 5.3 ft / 1.6 m
 Roll period: 15.4 seconds
 Steadiness - As gun platform (Average = 50 %): 63 %
   - Recoil effect (Restricted arc if above 1.00): 0.57
 Seaboat quality  (Average = 1.00): 1.27

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.531
 Length to Beam Ratio: 9.06 : 1
 'Natural speed' for length: 27.75 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (72 %):  28.00 ft / 8.53 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: 26.16 ft / 7.97 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 109.9 %
  - Above water (accommodation/working, high = better): 215.7 %
 Waterplane Area: 44,864 Square feet or 4,168 Square metres
 Displacement factor (Displacement / loading): 116 %
 Structure weight / hull surface area: 154 lbs/sq ft or 750 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.35
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

No comments:

Amazon Context Links