Transportowiec wodnosamolotów dla Portugalii - 16.01.2011

Prezentowany poniżej okręt to niedoszły transportowiec wodnosamolotów, w jaki zamierzała na początku lat 30-tych wyposażyć swoją flotę Portugalia. Projekt przygotowała włoska stocznia O.T.O. w Muggiano, a jego głównym wyposażeniem miało być 12 wodnosamolotów typu Piaggio P.6ter, w jakie wyposażano ówcześnie włoskie krążowniki. Niestety, z powodu zmian kursów walut projekt ostatecznie nie doczekał się realizacji, a szkoda, bo byłby to chyba ciekawy okręt..

Wizja artystyczna okrętu, rys. W. Ziółkowski, OW nr 24.

  

Wodnosamolot Piaggio P.6.

Sacadura Cabral, portugal seaplane carrier laid down 1932 (Engine 1933)

Displacement:
    5 558 t light; 5 716 t standard; 6 096 t normal; 6 400 t full load

Dimensions: Length overall / water x beam x draught
    412,77 ft / 406,82 ft x 57,41 ft x 17,72 ft (normal load)
    125,81 m / 124,00 m x 17,50 m  x 5,40 m

Armament:
      2 - 4,72" / 120 mm guns (1x2 guns), 52,72lbs / 23,92kg shells, 1932 Model
      Quick firing guns in a deck mount with hoist
      on centreline forward
      2 - 4,72" / 120 mm guns in single mounts, 52,72lbs / 23,92kg shells, 1932 Model
      Quick firing guns in deck mounts with hoists
      on centreline, all aft
      4 - 2,99" / 76,0 mm guns in single mounts, 13,39lbs / 6,08kg shells, 1932 Model
      Breech loading guns in deck mounts
      on side, all forward
      4 - 1,57" / 40,0 mm guns (2x2 guns), 1,95lbs / 0,89kg shells, 1932 Model
      Breech loading guns in deck mounts
      on centreline, all amidships
    Weight of broadside 272 lbs / 124 kg
    Shells per gun, main battery: 200

Armour:
   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    0,59" / 15 mm          -                  -
    2nd:    0,59" / 15 mm          -                  -

Machinery:
    Oil fired boilers, steam turbines,
    Geared drive, 2 shafts, 16 955 shp / 12 649 Kw = 22,00 kts
    Range 10 000nm at 10,00 kts
    Bunker at max displacement = 685 tons

Complement:
    344 - 448

Cost:
    £1,329 million / $5,314 million

Distribution of weights at normal displacement:
    Armament: 34 tons, 0,6%
    Armour: 6 tons, 0,1%
       - Belts: 0 tons, 0,0%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 6 tons, 0,1%
       - Armour Deck: 0 tons, 0,0%
       - Conning Tower: 0 tons, 0,0%
    Machinery: 494 tons, 8,1%
    Hull, fittings & equipment: 3 825 tons, 62,7%
    Fuel, ammunition & stores: 538 tons, 8,8%
    Miscellaneous weights: 1 200 tons, 19,7%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      12 897 lbs / 5 850 Kg = 244,6 x 4,7 " / 120 mm shells or 2,8 torpedoes
    Stability (Unstable if below 1.00): 1,04
    Metacentric height 2,3 ft / 0,7 m
    Roll period: 15,8 seconds
    Steadiness    - As gun platform (Average = 50 %): 75 %
            - Recoil effect (Restricted arc if above 1.00): 0,09
    Seaboat quality  (Average = 1.00): 1,51

Hull form characteristics:
    Hull has rise forward of midbreak
    Block coefficient: 0,516
    Length to Beam Ratio: 7,09 : 1
    'Natural speed' for length: 20,17 kts
    Power going to wave formation at top speed: 51 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): 15,00 degrees
    Stern overhang: 0,00 ft / 0,00 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        22,18 ft / 6,76 m
       - Forecastle (20%):    20,37 ft / 6,21 m
       - Mid (50%):        19,88 ft / 6,06 m (13,32 ft / 4,06 m aft of break)
       - Quarterdeck (15%):    13,32 ft / 4,06 m
       - Stern:        13,32 ft / 4,06 m
       - Average freeboard:    16,92 ft / 5,16 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 53,4%
        - Above water (accommodation/working, high = better): 143,9%
    Waterplane Area: 15 787 Square feet or 1 467 Square metres
    Displacement factor (Displacement / loading): 247%
    Structure weight / hull surface area: 159 lbs/sq ft or 777 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 1,99
        - Longitudinal: 3,85
        - Overall: 2,12
    Hull space for machinery, storage, compartmentation is excellent
    Room for accommodation and workspaces is excellent
    Ship has slow, easy roll, a good, steady gun platform
    Excellent seaboat, comfortable, can fire her guns in the heaviest weather