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Saturday, July 07, 2007

My design for a 1950 Dutch battlecruiser: the Wapen van Zeeland

I would build this class of four Dutch battlecruisers that are trying tohave a more modern outlook on fast capital ship design: the Wapen van Zeeland, Gouden Leeuw, Eendracht, and Nassau. I call the design the NL/CB/1950. The ships would obviously need operate under air cover, but could deliver shore bombardments and back lesser ships in blockades. This is the Springsharp report:
Wapen van Zeeland (NL/CB/1950), Netherlands Battlecruiser laid down 1950

Displacement:
 32,216 t light; 33,434 t standard; 37,994 t normal; 41,643 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (870.95 ft / 854.00 ft) x 106.00 ft x (26.00 / 27.91 ft)
 (265.47 m / 260.30 m) x 32.31 m  x (7.92 / 8.51 m)

Armament:
      6 - 12.00" / 305 mm 55.0 cal guns - 935.00lbs / 424.11kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts, 1950 Model
   2 x Single mounts on centreline, forward deck forward
  1 raised mount - superfiring
      12 - 5.00" / 127 mm 65.0 cal guns - 70.00lbs / 31.75kg shells, 150 per gun
   Dual purpose guns in turret on barbette mounts, 1950 Model
   6 x Twin mounts on sides, aft deck forward
      16 - 2.24" / 57.0 mm 70.0 cal guns - 6.33lbs / 2.87kg shells, 250 per gun
   Anti-air guns in deck and hoist mounts, 1950 Model
   8 x Single mounts on sides, aft deck forward
      Weight of broadside 6,551 lbs / 2,972 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 580.00 ft / 176.78 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 104 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 580.00 ft / 176.78 m 26.00 ft / 7.92 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 7.00" / 178 mm  10.0" / 254 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm
 3rd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armoured deck - multiple decks: 4.00" / 102 mm For and Aft decks

   - Conning towers: Forward 10.00" / 254 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 246,074 shp / 183,571 Kw = 36.00 kts
 Range 12,000nm at 18.00 kts
 Bunker at max displacement = 8,209 tons

Complement:
 1,359 - 1,768

Cost:
 £21.276 million / $85.106 million

Distribution of weights at normal displacement:
 Armament: 1,839 tons, 4.8 %
 Armour: 10,327 tons, 27.2 %
    - Belts: 2,339 tons, 6.2 %
    - Torpedo bulkhead: 2,232 tons, 5.9 %
    - Armament: 1,822 tons, 4.8 %
    - Armour Deck: 3,690 tons, 9.7 %
    - Conning Tower: 243 tons, 0.6 %
 Machinery: 5,887 tons, 15.5 %
 Hull, fittings & equipment: 14,163 tons, 37.3 %
 Fuel, ammunition & stores: 5,779 tons, 15.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   74,234 lbs / 33,672 Kg = 85.9 x 12.0 " / 305 mm shells or 12.5 torpedoes
 Stability (Unstable if below 1.00): 1.34
 Metacentric height 9.1 ft / 2.8 m
 Roll period: 14.7 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.22
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and large transom stern
 Block coefficient (normal/deep): 0.565 / 0.577
 Length to Beam Ratio: 8.06 : 1
 'Natural speed' for length: 33.68 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 22.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 30.00 %,  37.00 ft / 11.28 m,  29.00 ft / 8.84 m
    - Forward deck: 30.00 %,  29.00 ft / 8.84 m,  26.00 ft / 7.92 m
    - Aft deck: 25.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 15.00 %,  26.00 ft / 7.92 m,  27.00 ft / 8.23 m
    - Average freeboard:  28.39 ft / 8.65 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 85.4 %
  - Above water (accommodation/working, high = better): 250.8 %
 Waterplane Area: 66,726 Square feet or 6,199 Square metres
 Displacement factor (Displacement / loading): 129 %
 Structure weight / hull surface area: 166 lbs/sq ft or 808 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.24
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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