środa, 29 sierpnia 2012

Krążownik pancernopokładowy z 1891 r. - 05.05.2010

Krążownik pancernopokładowy dla francuskiej MW, zaprojektowany zgodnie z założeniami Jeune Ecole. Przeznaczenie - rajdy na wrogich liniach komunikacyjnych. Niestety, wynik nie do końca odpowiada oczekiwaniom - zasięg i prędkość pozostawiają sporo do życzenia, trzeba było też ograniczyć pancerz i uzbrojenie. Wygląda na to, że do osiągnięcia zadowalających parametrów przy poziomie techniki z początku ostatniej dekady XIX w. potrzebna będzie jednak sporo większa wyporność..

Bessieres, french cruiser laid down 1890 (Engine 1891)

Displacement:
    2 563 t light; 2 656 t standard; 3 223 t normal; 3 677 t full load

Dimensions: Length overall / water x beam x draught
    339,90 ft / 339,90 ft x 38,71 ft x 15,42 ft (normal load)
    103,60 m / 103,60 m x 11,80 m  x 4,70 m

Armament:
      2 - 3,94" / 100 mm guns in single mounts, 30,51lbs / 13,84kg shells, 1890 Model
      Quick firing guns in deck mounts with hoists
      on centreline ends, evenly spread
      4 - 3,94" / 100 mm guns in single mounts, 30,51lbs / 13,84kg shells, 1890 Model
      Quick firing guns in deck mounts with hoists
      on side, evenly spread
      4 - 2,24" / 57,0 mm guns in single mounts, 5,65lbs / 2,56kg shells, 1890 Model
      Quick firing guns in deck mounts
      on side, all amidships
      6 - 1,85" / 47,0 mm guns in single mounts, 3,17lbs / 1,44kg shells, 1890 Model
      Quick firing guns in deck mounts
      on side, evenly spread
    Weight of broadside 225 lbs / 102 kg
    Shells per gun, main battery: 190
    2 - 17,7" / 450 mm submerged torpedo tubes

Armour:
   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    1,18" / 30 mm          -                  -
    2nd:    1,18" / 30 mm          -                  -

   - Armour deck: 1,50" / 38 mm, Conning tower: 2,56" / 65 mm

Machinery:
    Coal fired boilers, complex reciprocating steam engines,
    Direct drive, 2 shafts, 7 087 ihp / 5 287 Kw = 19,20 kts
    Range 7 000nm at 10,00 kts
    Bunker at max displacement = 1 021 tons (100% coal)

Complement:
    213 - 278

Cost:
    £0,294 million / $1,175 million

Distribution of weights at normal displacement:
    Armament: 28 tons, 0,9%
    Armour: 283 tons, 8,8%
       - Belts: 0 tons, 0,0%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 15 tons, 0,5%
       - Armour Deck: 256 tons, 7,9%
       - Conning Tower: 12 tons, 0,4%
    Machinery: 1 289 tons, 40,0%
    Hull, fittings & equipment: 963 tons, 29,9%
    Fuel, ammunition & stores: 661 tons, 20,5%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      1 911 lbs / 867 Kg = 62,6 x 3,9 " / 100 mm shells or 0,5 torpedoes
    Stability (Unstable if below 1.00): 1,58
    Metacentric height 2,6 ft / 0,8 m
    Roll period: 10,1 seconds
    Steadiness    - As gun platform (Average = 50 %): 85 %
            - Recoil effect (Restricted arc if above 1.00): 0,15
    Seaboat quality  (Average = 1.00): 1,71

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,556
    Length to Beam Ratio: 8,78 : 1
    'Natural speed' for length: 18,44 kts
    Power going to wave formation at top speed: 47 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): -15,00 degrees
    Stern overhang: 0,00 ft / 0,00 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        18,04 ft / 5,50 m
       - Forecastle (20%):    11,81 ft / 3,60 m
       - Mid (50%):        11,81 ft / 3,60 m
       - Quarterdeck (15%):    11,81 ft / 3,60 m
       - Stern:        11,81 ft / 3,60 m
       - Average freeboard:    12,31 ft / 3,75 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 144,4%
        - Above water (accommodation/working, high = better): 97,5%
    Waterplane Area: 9 235 Square feet or 858 Square metres
    Displacement factor (Displacement / loading): 105%
    Structure weight / hull surface area: 64 lbs/sq ft or 311 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,96
        - Longitudinal: 1,47
        - Overall: 1,00
    Hull space for machinery, storage, compartmentation is cramped
    Room for accommodation and workspaces is adequate
    Ship has slow, easy roll, a good, steady gun platform
    Excellent seaboat, comfortable, can fire her guns in the heaviest weather

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