Rzeczne kutry uzbrojone

Czas na kolejne jednostki dla flotylli rzecznej. Są to 14-tonowe kutry uzbrojone, o napędzie silnikiem spalinowym, wyposażone w 1 działko kal. 37 mm Mc Cleana. Od poprzedniego typu przeznaczonego na rzeki krajowe (typ Osa z 1906 r. – post z 24.04.2015 r.) nowe kutry są szybsze o niemal 3 w., a posiadając niewielkie zanurzenie rzędu 0,5 m mają możliwość pływania po niemal wszystkich wodach śródlądowych nawet przy niskim ich stanie.   

RKU-1, polish river cutter laid down 1914

Displacement:
    13 t light; 14 t standard; 14 t normal; 14 t full load

Dimensions: Length overall / water x beam x draught
    55,15 ft / 55,15 ft x 11,68 ft x 1,80 ft (normal load)
    16,81 m / 16,81 m x 3,56 m  x 0,55 m

Armament:
      1 - 1,46" / 37,0 mm guns in single mounts, 1,55lbs / 0,70kg shells, 1914 Model
      Quick firing gun in deck mount
      on centreline forward
    Weight of broadside 2 lbs / 1 kg
    Shells per gun, main battery: 800

Armour:
   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    0,91" / 23 mm          -                  -

Machinery:
    Petrol Internal combustion motors,
    Direct drive, 1 shaft, 653 shp / 487 Kw = 19,00 kts
    Range 230nm at 9,00 kts
    Bunker at max displacement = 1 tons
      Caution: Delicate, lightweight machinery

Complement:
    6

Cost:
    £0,002 million / $0,009 million

Distribution of weights at normal displacement:
    Armament: 0 tons, 1,4%
    Armour: 1 tons, 4,1%
       - Belts: 0 tons, 0,0%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 1 tons, 4,1%
       - Armour Deck: 0 tons, 0,0%
       - Conning Tower: 0 tons, 0,0%
    Machinery: 8 tons, 56,2%
    Hull, fittings & equipment: 4 tons, 28,7%
    Fuel, ammunition & stores: 1 tons, 9,6%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      4 lbs / 2 Kg = 2,6 x 1,5 " / 37 mm shells or 0,0 torpedoes
    Stability (Unstable if below 1.00): 2,17
    Metacentric height 0,7 ft / 0,2 m
    Roll period: 6,0 seconds
    Steadiness    - As gun platform (Average = 50 %): 5 %
            - Recoil effect (Restricted arc if above 1.00): 0,01
    Seaboat quality  (Average = 1.00): 0,01

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,422
    Length to Beam Ratio: 4,72 : 1
    'Natural speed' for length: 7,43 kts
    Power going to wave formation at top speed: 85 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): 0,00 degrees
    Stern overhang: 0,00 ft / 0,00 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        2,99 ft / 0,91 m
       - Forecastle (20%):    2,99 ft / 0,91 m
       - Mid (50%):        2,49 ft / 0,76 m
       - Quarterdeck (15%):    2,00 ft / 0,61 m
       - Stern:        2,00 ft / 0,61 m
       - Average freeboard:    2,51 ft / 0,76 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 196,1%
        - Above water (accommodation/working, high = better): 59,9%
    Waterplane Area: 381 Square feet or 35 Square metres
    Displacement factor (Displacement / loading): 27%
    Structure weight / hull surface area: 8 lbs/sq ft or 40 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,45
        - Longitudinal: 1,37
        - Overall: 0,50
    Caution: Hull subject to strain in open-sea
    Hull space for machinery, storage, compartmentation is cramped
    Room for accommodation and workspaces is cramped
    Ship has quick, lively roll, not a steady gun platform
    Caution: Lacks seaworthiness - very limited seakeeping ability

RKU-1 (1914)
RKU-2 (1914)
RKU-3 (1914)
RKU-4 (1914)
RKU-5 (1914)
RKU-6 (1915)
RKU-7 (1915)