Canonnières

[Jefgte]

River gunboat Becquey gabarit

Canonnière Fluviale, France Becquey laid down 1892 (Engine 1890)

Displacement:
   88 t light; 105 t standard; 107 t normal; 109 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (100.07 ft / 100.07 ft) x 16.40 ft x (3.81 / 3.87 ft)
   (30.50 m / 30.50 m) x 5.00 m  x (1.16 / 1.18 m)

Armament:
      1 - 5.51" / 140 mm 45.0 cal gun - 84.44lbs / 38.30kg shells, 300 per gun
     Quick firing gun in deck mount, 1892 Model
     1 x Single mount on centreline, forward deck centre
      2 - 1.85" / 47.0 mm 45.0 cal guns - 3.20lbs / 1.45kg shells, 300 per gun
     Breech loading guns in deck mounts, 1892 Model
     2 x Single mounts on sides, aft deck centre
      2 - 0.31" / 8.0 mm 60.0 cal guns - 0.02lbs / 0.01kg shells, 2 000 per gun
     Machine guns in deck mounts, 1892 Model
     2 x Single mounts on sides, forward deck centre
      Weight of broadside 91 lbs / 41 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm         -               -
   2nd:   0.39" / 10 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 0.79" / 20 mm
   Forecastle: 0.79" / 20 mm  Quarter deck: 0.79" / 20 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 100 ihp / 75 Kw = 9.70 kts
   Range 500nm at 6.00 kts
   Bunker at max displacement = 4 tons (100% coal)

Complement:
   16 - 21

Cost:
   £0.010 million / $0.041 million

Distribution of weights at normal displacement:
   Armament: 16 tons, 14.8 %
      - Guns: 16 tons, 14.8 %
   Armour: 20 tons, 18.8 %
      - Armament: 3 tons, 2.7 %
      - Armour Deck: 17 tons, 16.1 %
   Machinery: 19 tons, 18.1 %
   Hull, fittings & equipment: 31 tons, 29.2 %
   Fuel, ammunition & stores: 20 tons, 18.2 %
   Miscellaneous weights: 1 tons, 0.9 %
      - Hull below water: 1 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     116 lbs / 52 Kg = 1.4 x 5.5 " / 140 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.61
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 8.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.32
   Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.602
   Length to Beam Ratio: 6.10 : 1
   'Natural speed' for length: 10.00 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 54
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   15.00 %,  5.91 ft / 1.80 m,  5.91 ft / 1.80 m
      - Forward deck:   35.00 %,  3.28 ft / 1.00 m,  3.28 ft / 1.00 m
      - Aft deck:   40.00 %,  3.28 ft / 1.00 m,  3.28 ft / 1.00 m
      - Quarter deck:   10.00 %,  3.28 ft / 1.00 m,  3.28 ft / 1.00 m
      - Average freeboard:      3.67 ft / 1.12 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 109.2 %
      - Above water (accommodation/working, high = better): 36.6 %
   Waterplane Area: 1 174 Square feet or 109 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 27 lbs/sq ft or 130 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.61
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily