Portugalski POW - 08.12.2011

W połowie lat 90-tych XIX w. Portugalia planowałapowiększenie swojej floty o dwa nowe okręty obrony wybrzeża. Miały to byćminiaturowe pancerniki, przeznaczone dla obrony Lizbony, i zbudowane w rodzimejstoczni według planów brytyjskiego Lairda. Miały to być okręty bardzo podobnedo argentyńskich okrętów typu Independencia, nieznacznie jednak większe, cospożytkowano głownie na osiągnięcie nieco większej prędkości. Ostatecznie zplanów tych nic nie wyszło i postanowiono się ograniczyć do głębokiejprzebudowy starego okrętu Vasco da Gama.

Okręty w typie: Lisboa, Porto.

  

Lisboa, portugal coastal battleship laid down 1895

Displacement:
    2 170 t light; 2 276 t standard; 2 500 t normal; 2 679 t full load

Dimensions: Length overall / water x beam x draught
    229,99 ft / 229,99 ft x 44,32 ft x 13,48 ft (normal load)
    70,10 m / 70,10 m x 13,51 m  x 4,11 m

Armament:
      2 - 9,45" / 240 mm guns in single mounts, 421,80lbs / 191,32kg shells, 1895 Model
      Breech loading guns in turrets (on barbettes)
      on centreline ends, evenly spread
      4 - 4,72" / 120 mm guns in single mounts, 52,72lbs / 23,92kg shells, 1895 Model
      Quick firing guns in deck mounts with hoists
      on side, all amidships
      4 - 1,85" / 47,0 mm guns in single mounts, 3,17lbs / 1,44kg shells, 1895 Model
      Quick firing guns in deck mounts
      on side, all amidships
    Weight of broadside 1 067 lbs / 484 kg
    Shells per gun, main battery: 90
    2 - 18,0" / 457 mm submerged torpedo tubes

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    7,99" / 203 mm    172,01 ft / 52,43 m    4,99 ft / 1,52 m
    Ends:    Unarmoured
      Main Belt covers 115% of normal length

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    5,98" / 152 mm    5,98" / 152 mm        7,99" / 203 mm
    2nd:    2,01" / 51 mm          -                  -

   - Armour deck: 0,98" / 25 mm, Conning tower: 4,02" / 102 mm

Machinery:
    Coal fired boilers, complex reciprocating steam engines,
    Direct drive, 2 shafts, 2 894 ihp / 2 159 Kw = 15,00 kts
    Range 3 300nm at 10,00 kts
    Bunker at max displacement = 403 tons (100% coal)

Complement:
    176 - 229

Cost:
    £0,254 million / $1,016 million

Distribution of weights at normal displacement:
    Armament: 133 tons, 5,3%
    Armour: 659 tons, 26,3%
       - Belts: 297 tons, 11,9%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 205 tons, 8,2%
       - Armour Deck: 140 tons, 5,6%
       - Conning Tower: 16 tons, 0,6%
    Machinery: 471 tons, 18,9%
    Hull, fittings & equipment: 907 tons, 36,3%
    Fuel, ammunition & stores: 330 tons, 13,2%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      2 121 lbs / 962 Kg = 5,0 x 9,4 " / 240 mm shells or 0,7 torpedoes
    Stability (Unstable if below 1.00): 1,20
    Metacentric height 2,1 ft / 0,6 m
    Roll period: 12,9 seconds
    Steadiness    - As gun platform (Average = 50 %): 59 %
            - Recoil effect (Restricted arc if above 1.00): 0,47
    Seaboat quality  (Average = 1.00): 1,17

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,637
    Length to Beam Ratio: 5,19 : 1
    'Natural speed' for length: 15,17 kts
    Power going to wave formation at top speed: 53 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): -11,00 degrees
    Stern overhang: 0,00 ft / 0,00 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        9,38 ft / 2,86 m
       - Forecastle (24%):    9,38 ft / 2,86 m
       - Mid (50%):        9,38 ft / 2,86 m
       - Quarterdeck (21%):    9,38 ft / 2,86 m
       - Stern:        9,38 ft / 2,86 m
       - Average freeboard:    9,38 ft / 2,86 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 108,7%
        - Above water (accommodation/working, high = better): 78,3%
    Waterplane Area: 7 713 Square feet or 717 Square metres
    Displacement factor (Displacement / loading): 92%
    Structure weight / hull surface area: 85 lbs/sq ft or 417 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,92
        - Longitudinal: 2,24
        - Overall: 1,00
    Hull space for machinery, storage, compartmentation is adequate
    Room for accommodation and workspaces is cramped