Brazylijski krążownik z artylerią 305 mm - 17.09.2010

Brazylijski cruiser-killer uzbrojony w 12-calówki, powstały celem „zagospodarowania” bocznych wież z pancerników typu Minas Gerais, które z nich wymontowano w ramach hipotetycznej przebudowy, celem zainstalowania mocniejszej siłowni. Przebudowany Minas Gerais pojawi się w którymś z kolejnych postów:-)

Okręty w typie: Riachuelo (1940), Tamandare (1941).

Riachuelo, cruiser brazilian laid down 1937 (Engine 1939)

Displacement:
    10 740 t light; 11 216 t standard; 12 073 t normal; 12 759 t full load

Dimensions: Length overall / water x beam x draught
    599,26 ft / 576,44 ft x 62,01 ft x 21,00 ft (normal load)
    182,66 m / 175,70 m x 18,90 m  x 6,40 m

Armament:
      4 - 12,01" / 305 mm guns (2x2 guns), 865,70lbs / 392,68kg shells, 1937 Model
      Breech loading guns in turrets (on barbettes)
      on centreline ends, evenly spread
      10 - 4,72" / 120 mm guns in single mounts, 52,72lbs / 23,92kg shells, 1937 Model
      Quick firing guns in deck mounts with hoists
      on side, all amidships
      6 - 2,99" / 76,0 mm guns in single mounts, 13,39lbs / 6,08kg shells, 1937 Model
      Anti-aircraft guns in deck mounts
      on side, all amidships
      8 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1937 Model
      Anti-aircraft guns in deck mounts
      on side, all amidships
    Weight of broadside 4 072 lbs / 1 847 kg
    Shells per gun, main battery: 100
    4 - 21,0" / 533 mm submerged torpedo tubes

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    5,51" / 140 mm    252,62 ft / 77,00 m    9,84 ft / 3,00 m
    Ends:    3,54" / 90 mm      98,43 ft / 30,00 m    7,55 ft / 2,30 m
      225,39 ft / 68,70 m Unarmoured ends
      Main Belt covers 67% of normal length
      Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
        2,56" / 65 mm    459,32 ft / 140,00 m    14,76 ft / 4,50 m

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    12,0" / 305 mm    9,02" / 229 mm        7,68" / 195 mm
    2nd:    2,36" / 60 mm          -                  -

   - Armour deck: 1,97" / 50 mm, Conning tower: 7,87" / 200 mm

Machinery:
    Oil fired boilers, steam turbines,
    Geared drive, 3 shafts, 82 133 shp / 61 271 Kw = 30,50 kts
    Range 7 400nm at 14,00 kts
    Bunker at max displacement = 1 543 tons

Complement:
    575 - 748

Cost:
    £6,080 million / $24,319 million

Distribution of weights at normal displacement:
    Armament: 509 tons, 4,2%
    Armour: 3 150 tons, 26,1%
       - Belts: 716 tons, 5,9%
       - Torpedo bulkhead: 642 tons, 5,3%
       - Armament: 783 tons, 6,5%
       - Armour Deck: 920 tons, 7,6%
       - Conning Tower: 89 tons, 0,7%
    Machinery: 2 222 tons, 18,4%
    Hull, fittings & equipment: 4 859 tons, 40,2%
    Fuel, ammunition & stores: 1 333 tons, 11,0%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      13 658 lbs / 6 195 Kg = 15,8 x 12,0 " / 305 mm shells or 2,2 torpedoes
    Stability (Unstable if below 1.00): 1,15
    Metacentric height 3,2 ft / 1,0 m
    Roll period: 14,6 seconds
    Steadiness    - As gun platform (Average = 50 %): 43 %
            - Recoil effect (Restricted arc if above 1.00): 0,68
    Seaboat quality  (Average = 1.00): 0,75

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,563
    Length to Beam Ratio: 9,30 : 1
    'Natural speed' for length: 24,01 kts
    Power going to wave formation at top speed: 57 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): 33,00 degrees
    Stern overhang: 4,92 ft / 1,50 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        27,56 ft / 8,40 m
       - Forecastle (20%):    17,39 ft / 5,30 m
       - Mid (50%):        17,39 ft / 5,30 m
       - Quarterdeck (15%):    17,39 ft / 5,30 m
       - Stern:        17,39 ft / 5,30 m
       - Average freeboard:    18,20 ft / 5,55 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 141,9%
        - Above water (accommodation/working, high = better): 145,5%
    Waterplane Area: 25 251 Square feet or 2 346 Square metres
    Displacement factor (Displacement / loading): 103%
    Structure weight / hull surface area: 125 lbs/sq ft or 611 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,98
        - Longitudinal: 1,19
        - Overall: 1,00
    Hull space for machinery, storage, compartmentation is cramped
    Room for accommodation and workspaces is excellent
    Poor seaboat, wet and uncomfortable, reduced performance in heavy weather