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Wednesday, June 22, 2005

A rework of my "48,000 ton battlecruiser" design

Well, this is only nominally a 48,000 ton ship, as my Springsharp design came out heavier, due to structural strength needs. The design is for a ship of 855ft x 105ft x 33.3ft with a speed of 30 knots. The armament is 9-16in/45 BLR and 20-5in QF guns. The armor basis is 14inches. This is the Springsharp report:
GB/CB/1921 48,000 tons, Great Britain Battlecruiser laid down 1921 (Engine 1937)

Displacement:
 43,640 t light; 45,621 t standard; 49,250 t normal; 52,153 t full load

Dimensions: Length overall / water x beam x draught
 856.57 ft / 855.00 ft x 105.00 ft x 33.30 ft (normal load)
 261.08 m / 260.60 m x 32.00 m  x 10.15 m

Armament:
      9 - 16.00" / 406 mm guns (3x3 guns), 2,048.00lbs / 928.96kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      20 - 5.00" / 127 mm guns (10x2 guns), 62.00lbs / 28.12kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 19,672 lbs / 8,923 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 14.0" / 356 mm 555.00 ft / 169.16 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 100 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 555.00 ft / 169.16 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 9.00" / 229 mm  14.0" / 356 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 5.00" / 127 mm, Conning tower: 12.00" / 305 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 161,252 shp / 120,294 Kw = 30.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 6,532 tons

Complement:
 1,652 - 2,148

Cost:
 £10.741 million / $42.964 million

Distribution of weights at normal displacement:
 Armament: 2,460 tons, 5.0 %
 Armour: 17,357 tons, 35.2 %
    - Belts: 5,627 tons, 11.4 %
    - Torpedo bulkhead: 1,191 tons, 2.4 %
    - Armament: 4,250 tons, 8.6 %
    - Armour Deck: 5,942 tons, 12.1 %
    - Conning Tower: 347 tons, 0.7 %
 Machinery: 4,469 tons, 9.1 %
 Hull, fittings & equipment: 19,353 tons, 39.3 %
 Fuel, ammunition & stores: 5,610 tons, 11.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   71,719 lbs / 32,531 Kg = 35.0 x 16.0 " / 406 mm shells or 10.6 torpedoes
 Stability (Unstable if below 1.00): 1.08
 Metacentric height 6.2 ft / 1.9 m
 Roll period: 17.7 seconds
 Steadiness - As gun platform (Average = 50 %): 62 %
   - Recoil effect (Restricted arc if above 1.00): 0.78
 Seaboat quality  (Average = 1.00): 1.24

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.577
 Length to Beam Ratio: 8.14 : 1
 'Natural speed' for length: 29.24 kts
 Power going to wave formation at top speed: 49 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  30.00 ft / 9.14 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (50 %):  24.00 ft / 7.32 m
    - Quarterdeck (15 %): 24.00 ft / 7.32 m
    - Stern:  24.00 ft / 7.32 m
    - Average freeboard: 24.48 ft / 7.46 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 83.1 %
  - Above water (accommodation/working, high = better): 177.8 %
 Waterplane Area: 64,237 Square feet or 5,968 Square metres
 Displacement factor (Displacement / loading): 107 %
 Structure weight / hull surface area: 210 lbs/sq ft or 1,026 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.20
  - 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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