środa, 29 sierpnia 2012

Monitor dla Japonii - 21.05.2010

Propozycja monitora do obrony wybrzeża dla Japonii w latach 60-tych XIX w.
  
Tatsuta, japanese monitor laid down 1865 (Engine 1866)


Displacement:
    1 445 t light; 1 556 t standard; 1 620 t normal; 1 671 t full load

Dimensions: Length overall / water x beam x draught
    211,29 ft / 211,29 ft x 44,29 ft x 10,50 ft (normal load)
    64,40 m / 64,40 m x 13,50 m  x 3,20 m

Armament:
      4 - 8,27" / 210 mm guns (2x2 guns), 176,61lbs / 80,11kg shells, 1865 Model
      Muzzle loading guns in Coles/Ericsson turrets
      on centreline ends, evenly spread
    Weight of broadside 706 lbs / 320 kg
    Shells per gun, main battery: 200

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    4,72" / 120 mm    211,29 ft / 64,40 m    5,25 ft / 1,60 m
    Ends:    Unarmoured
      Main Belt covers 154% of normal length

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    4,13" / 105 mm    3,15" / 80 mm              -

   - Armour deck: 1,46" / 37 mm, Conning tower: 4,72" / 120 mm

Machinery:
    Coal fired boilers, simple reciprocating steam engines,
    Direct drive, 1 shaft, 352 ihp / 263 Kw = 8,50 kts
    Range 2 000nm at 5,00 kts
    Bunker at max displacement = 115 tons (100% coal)

Complement:
    126 - 165

Cost:
    £0,138 million / $0,552 million

Distribution of weights at normal displacement:
    Armament: 88 tons, 5,5%
    Armour: 455 tons, 28,1%
       - Belts: 194 tons, 12,0%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 71 tons, 4,4%
       - Armour Deck: 176 tons, 10,9%
       - Conning Tower: 14 tons, 0,9%
    Machinery: 95 tons, 5,8%
    Hull, fittings & equipment: 807 tons, 49,8%
    Fuel, ammunition & stores: 175 tons, 10,8%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      1 311 lbs / 595 Kg = 7,4 x 8,3 " / 210 mm shells or 0,7 torpedoes
    Stability (Unstable if below 1.00): 1,49
    Metacentric height 2,9 ft / 0,9 m
    Roll period: 10,9 seconds
    Steadiness    - As gun platform (Average = 50 %): 29 %
            - Recoil effect (Restricted arc if above 1.00): 0,08
    Seaboat quality  (Average = 1.00): 0,31

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,577
    Length to Beam Ratio: 4,77 : 1
    'Natural speed' for length: 14,54 kts
    Power going to wave formation at top speed: 25 %
    Trim (Max stability = 0, Max steadiness = 100): 54
    Bow angle (Positive = bow angles forward): 0,00 degrees
    Stern overhang: 0,00 ft / 0,00 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        2,95 ft / 0,90 m
       - Forecastle (20%):    2,95 ft / 0,90 m
       - Mid (50%):        2,95 ft / 0,90 m
       - Quarterdeck (15%):    2,95 ft / 0,90 m
       - Stern:        2,95 ft / 0,90 m
       - Average freeboard:    2,95 ft / 0,90 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 63,1%
        - Above water (accommodation/working, high = better): 29,1%
    Waterplane Area: 6 527 Square feet or 606 Square metres
    Displacement factor (Displacement / loading): 120%
    Structure weight / hull surface area: 107 lbs/sq ft or 521 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 1,03
        - Longitudinal: 0,99
        - Overall: 1,00
    Hull space for machinery, storage, compartmentation is excellent
    Room for accommodation and workspaces is extremely poor
    Ship has quick, lively roll, not a steady gun platform
    Caution: Lacks seaworthiness - very limited seakeeping ability

Tatsuta (1866)
Chikuma (1866)
Uji (1867)
Noshiro (1867)

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