środa, 29 sierpnia 2012

Krążownik kolonialny Alkmaar - 29.11.2010

Propozycja opancerzonego krążownika kolonialnego dla Holandii, przeznaczonego do służby w Holenderskich Indiach Wschodnich. Projekt ten ostatecznie nie doczekał się realizacji - zbudowany krążownik Sumatra powstał według zupełnie innych planów..
 
źródło: Okręty Wojenne nr 30.

Alkmaar, dutch armoured cruiser laid down 1884 (Engine 1885)
Armoured Corvette (Broadside ironclad)

Displacement:
    2 878 t light; 3 089 t standard; 3 311 t normal; 3 489 t full load

Dimensions: Length overall / water x beam x draught
    236,22 ft / 233,27 ft x 47,57 ft x 13,62 ft (normal load)
    72,00 m / 71,10 m x 14,50 m  x 4,15 m

Armament:
      4 - 6,69" / 170 mm guns in single mounts, 136,41lbs / 61,87kg shells, 1884 Model
      Breech loading guns in broadside mounts
      on side ends, evenly spread
      2 - 6,69" / 170 mm guns in single mounts, 136,41lbs / 61,88kg shells, 1884 Model
      Breech loading guns in deck mounts
      on centreline ends, evenly spread
      4 - 5,91" / 150 mm guns in single mounts, 93,71lbs / 42,51kg shells, 1884 Model
      Breech loading guns in broadside mounts
      on side, all amidships
    Weight of broadside 1 193 lbs / 541 kg
    Shells per gun, main battery: 200

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    6,69" / 170 mm    187,01 ft / 57,00 m    12,47 ft / 3,80 m
    Ends:    Unarmoured
      Main Belt covers 123% of normal length

   - Armour deck: 1,18" / 30 mm, Conning tower: 7,87" / 200 mm

Machinery:
    Coal fired boilers, simple reciprocating steam engines,
    Direct drive, 1 shaft, 3 832 ihp / 2 858 Kw = 15,00 kts
    Range 3 500nm at 8,00 kts
    Bunker at max displacement = 400 tons (100% coal)

Complement:
    349

Cost:
    £0,327 million / $1,310 million

Distribution of weights at normal displacement:
    Armament: 149 tons, 4,5%
    Armour: 917 tons, 27,7%
       - Belts: 673 tons, 20,3%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 0 tons, 0,0%
       - Armour Deck: 207 tons, 6,2%
       - Conning Tower: 38 tons, 1,1%
    Machinery: 724 tons, 21,9%
    Hull, fittings & equipment: 1 088 tons, 32,9%
    Fuel, ammunition & stores: 433 tons, 13,1%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      3 668 lbs / 1 664 Kg = 26,9 x 6,7 " / 170 mm shells or 0,8 torpedoes
    Stability (Unstable if below 1.00): 1,38
    Metacentric height 2,9 ft / 0,9 m
    Roll period: 11,8 seconds
    Steadiness    - As gun platform (Average = 50 %): 100 %
            - Recoil effect (Restricted arc if above 1.00): 0,43
    Seaboat quality  (Average = 1.00): 2,00

Hull form characteristics:
    Hull has low forecastle, low quarterdeck
    Block coefficient: 0,767
    Length to Beam Ratio: 4,90 : 1
    'Natural speed' for length: 15,27 kts
    Power going to wave formation at top speed: 56 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): -10,00 degrees
    Stern overhang: 2,95 ft / 0,90 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        15,09 ft / 4,60 m
       - Forecastle (13%):    14,76 ft / 4,50 m (18,04 ft / 5,50 m aft of break)
       - Mid (50%):        16,73 ft / 5,10 m
       - Quarterdeck (10%):    13,78 ft / 4,20 m (16,73 ft / 5,10 m before break)
       - Stern:        13,78 ft / 4,20 m
       - Average freeboard:    16,44 ft / 5,01 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 107,2%
        - Above water (accommodation/working, high = better): 141,4%
    Waterplane Area: 9 453 Square feet or 878 Square metres
    Displacement factor (Displacement / loading): 92%
    Structure weight / hull surface area: 78 lbs/sq ft or 380 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,86
        - Longitudinal: 3,90
        - Overall: 1,00
    Hull space for machinery, storage, compartmentation is adequate
    Room for accommodation and workspaces is excellent
    Ship has slow, easy roll, a good, steady gun platform
    Excellent seaboat, comfortable, can fire her guns in the heaviest weather

(załoga 349 - zwiększona ze względu na przewidywane pomocnicze ożaglowanie okrętu).

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