Mały predrednot rosyjski - 21.10.2010

Niniejszy okręt jest próbą zrealizowania idei która przyświecała konstruktorom innego rosyjskiego pancernika z końca XIX w. - Rostisława. Chodziło o zbudowanie jednostki małej (a przez to stosunkowo taniej) oraz mającej małe zanurzenie, co umożliwić miało podejście blisko brzegu celem ostrzeliwania celów lądowych. W przeciwieństwie do Rostisława, gdzie tych założeń nie udało się zrealizować, ten projekt wygląda dość obiecująco - przy ograniczonym zanurzeniu i wyporności, udało się zainstalować 4 12-calówki, i osiągnąć prędkość 17 w. Oczywiście coś kosztem czegoś - ucierpiały dość znacznie zasięg okrętu i powierzchnia opancerzenia, co z kolei przełożyło się na nienadzwyczajną odporność na trafienia.. 

Izmaił, russian battleship laid down 1896 (Engine 1897)

Displacement:
    7 525 t light; 7 894 t standard; 8 200 t normal; 8 444 t full load

Dimensions: Length overall / water x beam x draught
    349,41 ft / 349,41 ft x 67,91 ft x 20,67 ft (normal load)
    106,50 m / 106,50 m x 20,70 m  x 6,30 m

Armament:
      4 - 12,01" / 305 mm guns (2x2 guns), 865,70lbs / 392,68kg shells, 1896 Model
      Breech loading guns in turrets (on barbettes)
      on centreline ends, evenly spread
      8 - 5,98" / 152 mm guns in single mounts, 107,15lbs / 48,60kg shells, 1896 Model
      Quick firing guns in casemate mounts
      on side, all amidships
      8 - 2,95" / 75,0 mm guns in single mounts, 12,87lbs / 5,84kg shells, 1896 Model
      Quick firing guns in deck mounts
      on side, all amidships
      12 - 1,46" / 37,0 mm guns in single mounts, 1,55lbs / 0,70kg shells, 1896 Model
      Quick firing guns in deck mounts
      on side, evenly spread
    Weight of broadside 4 442 lbs / 2 015 kg
    Shells per gun, main battery: 80
    1 - 18,0" / 457 mm above water torpedoes, 2 - 18,0" / 457 mm submerged torpedo tubes

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    15,0" / 381 mm    208,66 ft / 63,60 m    6,56 ft / 2,00 m
    Ends:    Unarmoured
      Main Belt covers 92% of normal length
      Main belt does not fully cover magazines and engineering spaces

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    11,5" / 292 mm    8,58" / 218 mm        8,11" / 206 mm
    2nd:    5,12" / 130 mm          -                  -

   - Armour deck: 2,24" / 57 mm, Conning tower: 8,19" / 208 mm

Machinery:
    Coal fired boilers, complex reciprocating steam engines,
    Direct drive, 2 shafts, 8 319 ihp / 6 206 Kw = 17,00 kts
    Range 3 600nm at 8,00 kts
    Bunker at max displacement = 550 tons (100% coal)

Complement:
    430 - 560

Cost:
    £0,921 million / $3,683 million

Distribution of weights at normal displacement:
    Armament: 555 tons, 6,8%
    Armour: 2 511 tons, 30,6%
       - Belts: 943 tons, 11,5%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 786 tons, 9,6%
       - Armour Deck: 711 tons, 8,7%
       - Conning Tower: 72 tons, 0,9%
    Machinery: 1 364 tons, 16,6%
    Hull, fittings & equipment: 3 095 tons, 37,7%
    Fuel, ammunition & stores: 675 tons, 8,2%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      7 017 lbs / 3 183 Kg = 8,1 x 12,0 " / 305 mm shells or 1,3 torpedoes
    Stability (Unstable if below 1.00): 1,20
    Metacentric height 3,9 ft / 1,2 m
    Roll period: 14,4 seconds
    Steadiness    - As gun platform (Average = 50 %): 74 %
            - Recoil effect (Restricted arc if above 1.00): 0,53
    Seaboat quality  (Average = 1.00): 1,48

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,585
    Length to Beam Ratio: 5,14 : 1
    'Natural speed' for length: 18,69 kts
    Power going to wave formation at top speed: 48 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    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:        13,45 ft / 4,10 m
       - Forecastle (20%):    13,45 ft / 4,10 m
       - Mid (50%):        13,45 ft / 4,10 m
       - Quarterdeck (15%):    13,45 ft / 4,10 m
       - Stern:        13,45 ft / 4,10 m
       - Average freeboard:    13,45 ft / 4,10 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): 99,8%
    Waterplane Area: 17 116 Square feet or 1 590 Square metres
    Displacement factor (Displacement / loading): 85%
    Structure weight / hull surface area: 132 lbs/sq ft or 643 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,91
        - Longitudinal: 2,29
        - Overall: 1,00
    Hull space for machinery, storage, compartmentation is adequate
    Room for accommodation and workspaces is adequate
    Ship has slow, easy roll, a good, steady gun platform
    Good seaboat, rides out heavy weather easily