Kanonierka torpedowa (1883)

A oto obiecywana kanonierka torpedowa. Jak w większości tego rodzaju okrętów, dość słabą jej stroną jest prędkość (nieco ponad 18 w., choć przy większej fali przeciętny torpedowiec też więcej nie wyciągnie, o ile nie zatonie..), ale za to ma sporą siłę ognia – bo aż 4 wyrzutnie torped, no i nieporównywalnie lepsza dzielność morską od torpedowców, dzięki czemu może być wykorzystywany w znacznie szerszym zakresie warunków pogodowych. 

Trzygłów, polish torpedo gunboat laid down 1882 (Engine 1883)

Displacement:
    693 t light; 713 t standard; 805 t normal; 879 t full load

Dimensions: Length overall / water x beam x draught
    203,84 ft / 202,82 ft x 26,08 ft x 10,89 ft (normal load)
    62,13 m / 61,82 m x 7,95 m  x 3,32 m

Armament:
      2 - 3,43" / 87,0 mm guns in single mounts, 17,68lbs / 8,02kg shells, 1882 Model
      Breech loading guns in deck mounts
      on centreline ends, evenly spread
      2 - 1,46" / 37,0 mm guns in single mounts, 1,36lbs / 0,62kg shells, 1882 Model
      Quick firing guns in deck mounts
      on side, all amidships
      1 - 1,46" / 37,0 mm guns in single mounts, 1,36lbs / 0,62kg shells, 1882 Model
      Quick firing gun in deck mount
      on centreline forward
    Weight of broadside 39 lbs / 18 kg
    Shells per gun, main battery: 180
    4 - 15,0" / 381 mm above water torpedoes

Machinery:
    Coal fired boilers, simple reciprocating steam engines,
    Direct drive, 1 shaft, 3 188 ihp / 2 378 Kw = 18,30 kts
    Range 2 000nm at 10,00 kts
    Bunker at max displacement = 166 tons (100% coal)

Complement:
    75 - 98

Cost:
    £0,087 million / $0,349 million

Distribution of weights at normal displacement:
    Armament: 5 tons, 0,6%
    Machinery: 421 tons, 52,3%
    Hull, fittings & equipment: 263 tons, 32,6%
    Fuel, ammunition & stores: 112 tons, 14,0%
    Miscellaneous weights: 4 tons, 0,5%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      289 lbs / 131 Kg = 16,3 x 3,4 " / 87 mm shells or 0,2 torpedoes
    Stability (Unstable if below 1.00): 1,52
    Metacentric height 1,4 ft / 0,4 m
    Roll period: 9,4 seconds
    Steadiness    - As gun platform (Average = 50 %): 60 %
            - Recoil effect (Restricted arc if above 1.00): 0,04
    Seaboat quality  (Average = 1.00): 1,19

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,489
    Length to Beam Ratio: 7,78 : 1
    'Natural speed' for length: 14,24 kts
    Power going to wave formation at top speed: 57 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): 0,00 degrees
    Stern overhang: 1,02 ft / 0,31 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        9,48 ft / 2,89 m
       - Forecastle (20%):    8,46 ft / 2,58 m
       - Mid (50%):        8,46 ft / 2,58 m
       - Quarterdeck (15%):    8,46 ft / 2,58 m
       - Stern:        8,46 ft / 2,58 m
       - Average freeboard:    8,55 ft / 2,60 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 174,3%
        - Above water (accommodation/working, high = better): 52,8%
    Waterplane Area: 3 348 Square feet or 311 Square metres
    Displacement factor (Displacement / loading): 61%
    Structure weight / hull surface area: 45 lbs/sq ft or 218 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,92
        - Longitudinal: 2,09
        - Overall: 1,00
    Hull space for machinery, storage, compartmentation is cramped
    Room for accommodation and workspaces is cramped