Flota polska w XIX w. - mała kanonierka

Jako że z początkiem lat 60-tych nasza flota cierpi na brak okrętów przeznaczonych zadań patrolowych, łącznikowych, strażniczych, zwalczania przemytu itp., kolejną propozycją jest taka oto mała kanonierka, która dzięki swoim niewielkim rozmiarom a więc i niskiemu kosztowi, może być zbudowana w większej ilości:

Mewa, polish gunboat laid down 1862

Displacement:
    171 t light; 176 t standard; 205 t normal; 228 t full load

Dimensions: Length overall / water x beam x draught
    100,96 ft / 87,47 ft x 18,90 ft x 7,97 ft (normal load)
    30,77 m / 26,66 m x 5,76 m  x 2,43 m

Armament:
      1 - 24pdr guns in single mounts, 24lbs / 10,89kg shells, 1862 Model
      Smoothbore gun in deck mount
      on centreline amidships
    Weight of broadside 24 lbs / 11 kg
    Shells per gun, main battery: 120

Machinery:
    Coal fired boilers, simple reciprocating steam engines,
    Direct drive, 1 shaft, 270 ihp / 201 Kw = 10,50 kts
    Range 1 350nm at 7,00 kts
    Bunker at max displacement = 51 tons (100% coal)

Complement:
    44

Cost:
    £0,019 million / $0,078 million

Distribution of weights at normal displacement:
    Armament: 3 tons, 1,3%
    Machinery: 81 tons, 39,6%
    Hull, fittings & equipment: 77 tons, 37,7%
    Fuel, ammunition & stores: 34 tons, 16,6%
    Miscellaneous weights: 10 tons, 4,9%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      65 lbs / 30 Kg = 3,2 x 4,1 " / 105 mm shells or 0,1 torpedoes
    Stability (Unstable if below 1.00): 1,28
    Metacentric height 0,6 ft / 0,2 m
    Roll period: 9,9 seconds
    Steadiness    - As gun platform (Average = 50 %): 87 %
            - Recoil effect (Restricted arc if above 1.00): 0,11
    Seaboat quality  (Average = 1.00): 1,74

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,544
    Length to Beam Ratio: 4,63 : 1
    'Natural speed' for length: 9,35 kts
    Power going to wave formation at top speed: 58 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): 44,00 degrees
    Stern overhang: 3,48 ft / 1,06 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        10,37 ft / 3,16 m
       - Forecastle (20%):    7,51 ft / 2,29 m
       - Mid (50%):        6,00 ft / 1,83 m
       - Quarterdeck (15%):    6,00 ft / 1,83 m
       - Stern:        6,50 ft / 1,98 m
       - Average freeboard:    6,80 ft / 2,07 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 142,8%
        - Above water (accommodation/working, high = better): 51,7%
    Waterplane Area: 1 111 Square feet or 103 Square metres
    Displacement factor (Displacement / loading): 106%
    Structure weight / hull surface area: 39 lbs/sq ft or 189 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,82
        - Longitudinal: 6,00
        - Overall: 1,00
    Hull space for machinery, storage, compartmentation is cramped
    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

Mewa (1862)
Czajka (1862)
Czapla (1862)
Pelikan (1862)
Kormoran (1863)
Rybitwa (1863)
Jaskółka (1863)
Żuraw (1864)