Kuter moździerzowy

Oto zapowiadany rzeczny kuter moździerzowy, wyposażony w lekki moździerz kal. 75 mm, ładowany odprzodowo. Dzięki małym rozmiarom i płytkiemu zanurzeniu może niespodziewanie podpływać do brzegu i razić z zaskoczenia wrogie oddziały na brzegu. Do samoobrony posiada 1 km, natomiast ochronę bierną zapewnia 20 mm pancerz na burcie.  

 RKM-1, polish river mortar cutter laid down 1913

Displacement:
    8 t light; 8 t standard; 8 t normal; 9 t full load

Dimensions: Length overall / water x beam x draught
    49,77 ft / 49,28 ft x 9,12 ft x 1,64 ft (normal load)
    15,17 m / 15,02 m x 2,78 m  x 0,50 m

Armament:
      1 - 2,95" / 75,0 mm guns in single mounts, 10,47lbs / 4,75kg shells, 1913 Model
      Muzzle loading mortar in deck mount
      on centreline aft
      1 - 0,30" / 7,6 mm guns in single mounts, 0,01lbs / 0,01kg shells, 1913 Model
      Machine gun in deck mount
      on centreline forward
    Weight of broadside 0 lbs / 0 kg
    Shells per gun, main battery: 150

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    0,79" / 20 mm      23,43 ft / 7,14 m    2,49 ft / 0,76 m
    Ends:    Unarmoured
      Main Belt covers 73% of normal length

Machinery:
    Diesel Internal combustion motors,
    Direct drive, 2 shafts, 28 shp / 21 Kw = 10,00 kts
    Range 200nm at 6,00 kts
    Bunker at max displacement = 0 tons

Complement:
    5

Cost:
    £0,001 million / $0,002 million

Distribution of weights at normal displacement:
    Armament: 0 tons, 0,7%
    Armour: 2 tons, 26,0%
       - Belts: 2 tons, 26,0%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 0 tons, 0,0%
       - Armour Deck: 0 tons, 0,0%
       - Conning Tower: 0 tons, 0,0%
    Machinery: 1 tons, 13,1%
    Hull, fittings & equipment: 5 tons, 56,3%
    Fuel, ammunition & stores: 0 tons, 3,8%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      33 lbs / 15 Kg = 69,9 x 1,0 " / 25 mm shells or 0,3 torpedoes
    Stability (Unstable if below 1.00): 1,28
    Metacentric height 0,2 ft / 0,1 m
    Roll period: 8,3 seconds
    Steadiness    - As gun platform (Average = 50 %): 42 %
            - Recoil effect (Restricted arc if above 1.00): 0,02
    Seaboat quality  (Average = 1.00): 0,71

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,400
    Length to Beam Ratio: 5,40 : 1
    'Natural speed' for length: 7,02 kts
    Power going to wave formation at top speed: 59 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): 8,00 degrees
    Stern overhang: 0,00 ft / 0,00 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        3,48 ft / 1,06 m
       - Forecastle (20%):    2,99 ft / 0,91 m
       - Mid (50%):        2,49 ft / 0,76 m
       - Quarterdeck (24%):    2,49 ft / 0,76 m
       - Stern:        2,99 ft / 0,91 m
       - Average freeboard:    2,76 ft / 0,84 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 49,5%
        - Above water (accommodation/working, high = better): 69,2%
    Waterplane Area: 277 Square feet or 26 Square metres
    Displacement factor (Displacement / loading): 172%
    Structure weight / hull surface area: 12 lbs/sq ft or 60 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 1,11
        - Longitudinal: 3,81
        - Overall: 1,26
    Hull space for machinery, storage, compartmentation is excellent
    Room for accommodation and workspaces is cramped
    Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

RKM-1 (1913)
RKM-2 (1913)
RKM-3 (1913)
RKM-4 (1914)
RKM-5 (1914)
RKM-6 (1914)