Japońska fregata (1874) - 27.09.2011

Dziś prezentuje fregatę - mającą zastąpić dość już przestarzałe w połowie lat 70-tych XIX w. okręty typu Ashigara z poprzedniej dekady (patrz post z 14.09).

Azami, japanese frigate laid down 1873 (Engine 1874)

Displacement:
    3 852 t light; 4 103 t standard; 4 762 t normal; 5 289 t full load

Dimensions: Length overall / water x beam x draught
    311,42 ft / 306,66 ft x 45,57 ft (Bulges 46,62 ft) x 20,87 ft (normal load)
    94,92 m / 93,47 m x 13,89 m (Bulges 14,21 m)  x 6,36 m

Armament:
      8 - 7,99" / 203 mm guns in single mounts, 190,16lbs / 86,25kg shells, 1873 Model
      Breech loading guns in broadside mounts
      on side, all amidships
      8 - 5,91" / 150 mm guns in single mounts, 76,72lbs / 34,80kg shells, 1873 Model
      Breech loading guns in broadside mounts
      on side ends, evenly spread
    Weight of broadside 2 135 lbs / 968 kg
    Shells per gun, main battery: 125

Armour:

   - Conning tower: 2,36" / 60 mm

Machinery:
    Coal fired boilers, simple reciprocating steam engines,
    Direct drive, 1 shaft, 5 892 ihp / 4 395 Kw = 16,30 kts
    Range 3 750nm at 10,00 kts
    Bunker at max displacement = 1 187 tons (100% coal)

Complement:
    544

Cost:
    £0,545 million / $2,181 million

Distribution of weights at normal displacement:
    Armament: 267 tons, 5,6%
    Armour: 14 tons, 0,3%
       - Belts: 0 tons, 0,0%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 0 tons, 0,0%
       - Armour Deck: 0 tons, 0,0%
       - Conning Tower: 14 tons, 0,3%
    Machinery: 1 331 tons, 27,9%
    Hull, fittings & equipment: 1 855 tons, 38,9%
    Fuel, ammunition & stores: 910 tons, 19,1%
    Miscellaneous weights: 385 tons, 8,1%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      1 942 lbs / 881 Kg = 10,2 x 8,0 " / 203 mm shells or 0,4 torpedoes
    Stability (Unstable if below 1.00): 1,22
    Metacentric height 2,2 ft / 0,7 m
    Roll period: 13,1 seconds
    Steadiness    - As gun platform (Average = 50 %): 100 %
            - Recoil effect (Restricted arc if above 1.00): 0,83
    Seaboat quality  (Average = 1.00): 2,00

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,559
    Length to Beam Ratio: 6,58 : 1
    'Natural speed' for length: 17,51 kts
    Power going to wave formation at top speed: 46 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): -11,00 degrees
    Stern overhang: 4,76 ft / 1,45 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        19,65 ft / 5,99 m
       - Forecastle (20%):    17,16 ft / 5,23 m
       - Mid (50%):        17,16 ft / 5,23 m
       - Quarterdeck (15%):    17,16 ft / 5,23 m
       - Stern:        18,18 ft / 5,54 m
       - Average freeboard:    17,43 ft / 5,31 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 141,6%
        - Above water (accommodation/working, high = better): 109,1%
    Waterplane Area: 9 551 Square feet or 887 Square metres
    Displacement factor (Displacement / loading): 91%
    Structure weight / hull surface area: 102 lbs/sq ft or 499 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,86
        - Longitudinal: 4,04
        - 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

Okręty w typie:
Azami (1874)
Iwate (1875)
Akagi (1876)
Chokai (1876)