Argentyński POW (lata 60-te XIX w.)

Po krótkiej wakacyjnej przerwie, coś dla Argentyny: mały pancernik, wzorowany na greckim Vasilefs Georgios. W rzeczywistości, flota argentyńska swoich pierwszych okrętów pancernych dorobiła się dopiero w połowie lat 70-tych XIX w., kiedy to do służby weszły dwa małe (1.500 ton) monitory, czy jak kto woli – pancerniki obrony wybrzeża, tj. La Plata i Los Andes. Poniższy okręt to przedstawiciel poprzedniej generacji – pancernik kazamatowy, w rodzaju tych jakie były dość popularne w późnych latach 60-tych XIX w. wśród mniejszych flot (miała takich kilka m.in. Brazylia).   

 
San Martin, argentinian coastal battleship laid down 1867 (Engine 1868)

Displacement:
    1 734 t light; 1 804 t standard; 1 905 t normal; 1 987 t full load

Dimensions: Length overall / water x beam x draught
    201,35 ft / 196,85 ft x 46,85 ft x 12,96 ft (normal load)
    61,37 m / 60,00 m x 14,28 m  x 3,95 m

Armament:
      4 - 7,99" / 203 mm guns in single mounts, 167,19lbs / 75,84kg shells, 1867 Model
      Breech loading guns in casemate mounts
      on side, all amidships
    Weight of broadside 669 lbs / 303 kg
    Shells per gun, main battery: 85

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    7,01" / 178 mm      87,99 ft / 26,82 m    6,50 ft / 1,98 m
    Ends:    Unarmoured
      Main Belt covers 69% of normal length
      Main belt does not fully cover magazines and engineering spaces

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    7,01" / 178 mm          -                  -

   - Armour deck: 0,98" / 25 mm, Conning tower: 2,01" / 51 mm

Machinery:
    Coal fired boilers, simple reciprocating steam engines,
    Direct drive, 1 shaft, 1 312 ihp / 979 Kw = 12,00 kts
    Range 1 650nm at 7,00 kts
    Bunker at max displacement = 183 tons (100% coal)

Complement:
    187

Cost:
    £0,178 million / $0,712 million

Distribution of weights at normal displacement:
    Armament: 84 tons, 4,4%
    Armour: 469 tons, 24,6%
       - Belts: 210 tons, 11,0%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 139 tons, 7,3%
       - Armour Deck: 115 tons, 6,0%
       - Conning Tower: 7 tons, 0,3%
    Machinery: 336 tons, 17,6%
    Hull, fittings & equipment: 793 tons, 41,6%
    Fuel, ammunition & stores: 171 tons, 9,0%
    Miscellaneous weights: 52 tons, 2,7%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      1 649 lbs / 748 Kg = 9,9 x 8,0 " / 203 mm shells or 0,5 torpedoes
    Stability (Unstable if below 1.00): 1,50
    Metacentric height 3,2 ft / 1,0 m
    Roll period: 11,0 seconds
    Steadiness    - As gun platform (Average = 50 %): 100 %
            - Recoil effect (Restricted arc if above 1.00): 0,18
    Seaboat quality  (Average = 1.00): 2,00

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,558
    Length to Beam Ratio: 4,20 : 1
    'Natural speed' for length: 14,03 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: 4,49 ft / 1,37 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        12,96 ft / 3,95 m
       - Forecastle (24%):    11,48 ft / 3,50 m
       - Mid (50%):        10,47 ft / 3,19 m
       - Quarterdeck (24%):    10,47 ft / 3,19 m
       - Stern:        10,96 ft / 3,34 m
       - Average freeboard:    11,04 ft / 3,37 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 93,0%
        - Above water (accommodation/working, high = better): 89,9%
    Waterplane Area: 6 298 Square feet or 585 Square metres
    Displacement factor (Displacement / loading): 102%
    Structure weight / hull surface area: 88 lbs/sq ft or 431 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,87
        - Longitudinal: 3,24
        - Overall: 1,00
    Hull space for machinery, storage, compartmentation is adequate
    Room for accommodation and workspaces is cramped
    Ship has slow, easy roll, a good, steady gun platform
    Excellent seaboat, comfortable, can fire her guns in the heaviest weather