Cannonières

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Gunboats of the French Fleet

GB1-GB2-GB3-GB4-GB5-GB6-GB7-GB8-GB9-GB10-GB11-GB12
1870 - 1050t/1309t - 1x140+2x100 - 14kts-3000nm@7kts-Sailspeed 12.3kts

CGB1-CGB2-CGB3-CGB4-CGB5-CGB6-CGB7-CGB8-CGB9-CGB10-CGB11-CGB12
1870 - 200t/267t - 1x100+2x47 - 10kts-2000nm@7kts-Sailspeed 12.4kts

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GB1-GB2-GB3-GB4-GB5-GB6-GB7-GB8-GB9-GB10-GB11-GB12

SGB1, France SGB1 laid down 1870

Displacement:
   1 050 t light; 1 090 t standard; 1 212 t normal; 1 309 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (160.76 ft / 157.48 ft) x 32.81 ft x (12.91 / 21.64 ft)
   (49.00 m / 48.00 m) x 10.00 m  x (3.93 / 6.60 m)

Armament:
      2 - 5.51" / 140 mm 30.0 cal guns - 64.57lbs / 29.29kg shells, 140 per gun
     Breech loading guns in deck mounts, 1870 Model
     2 x Single mounts on centreline ends, evenly spread
      2 - 3.94" / 100 mm 30.0 cal guns - 23.52lbs / 10.67kg shells, 180 per gun
     Breech loading guns in deck mounts, 1870 Model
     2 x Single mounts on sides, forward deck aft
      2 - 1.85" / 47.0 mm 45.0 cal guns - 2.67lbs / 1.21kg shells, 200 per gun
     Breech loading guns in deck mounts, 1870 Model
     4 x Single mounts on sides, forward evenly spread
      2 raised mounts
      2 - 0.51" / 13.0 mm 45.0 cal guns - 0.07lbs / 0.03kg shells, 1 000 per gun
     Breech loading guns in deck mounts, 1870 Model
     2 x Single mounts on sides, forward deck centre
      Weight of broadside 182 lbs / 82 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.59" / 15 mm         -               -
   2nd:   0.59" / 15 mm         -               -
   3rd:   0.20" / 5 mm         -               -
   4th:   0.20" / 5 mm         -               -

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 1 975 ihp / 1 473 Kw = 14.00 kts
   Range 3 000nm at 7.00 kts
   Bunker at max displacement = 219 tons (100% coal)

Complement:
   102 - 133

Cost:
   £0.110 million / $0.442 million

Distribution of weights at normal displacement:
   Armament: 19 tons, 1.6 %
      - Guns: 19 tons, 1.6 %
   Armour: 10 tons, 0.8 %
      - Armament: 10 tons, 0.8 %
   Machinery: 484 tons, 39.9 %
   Hull, fittings & equipment: 365 tons, 30.2 %
   Fuel, ammunition & stores: 161 tons, 13.3 %
   Miscellaneous weights: 172 tons, 14.2 %
      - On freeboard deck: 15 tons
      - Above deck: 157 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     510 lbs / 231 Kg = 8.7 x 5.5 " / 140 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.33
   Metacentric height 1.6 ft / 0.5 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 68 %
         - Recoil effect (Restricted arc if above 1.00): 0.14
   Seaboat quality  (Average = 1.00): 1.36

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.636 / 0.410
   Length to Beam Ratio: 4.80 : 1
   'Natural speed' for length: 12.55 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): -20.00 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 %,  13.12 ft / 4.00 m,  12.47 ft / 3.80 m
      - Forward deck:   35.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Aft deck:   35.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   15.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      10.28 ft / 3.13 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 134.9 %
      - Above water (accommodation/working, high = better): 71.8 %
   Waterplane Area: 3 907 Square feet or 363 Square metres
   Displacement factor (Displacement / loading): 100 %
   Structure weight / hull surface area: 61 lbs/sq ft or 297 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.85
      - Longitudinal: 4.00
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Good seaboat, rides out heavy weather easily

Half natural Speed: 6.275kts
Sails Speed: 6.275 + 6.02kts = 12.3Kts

[Jefgte]

Coastal Gunboat - Patrol ship

CGB1-CGB2-CGB3-CGB4-CGB5-CGB6-CGB7-CGB8-CGB9-CGB10-CGB11-CGB12

CGB2, France CGB2 laid down 1870

Displacement:
   200 t light; 208 t standard; 241 t normal; 267 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (124.67 ft / 121.39 ft) x 22.97 ft x (5.04 / 5.49 ft)
   (38.00 m / 37.00 m) x 7.00 m  x (1.54 / 1.67 m)

Armament:
      1 - 3.94" / 100 mm 30.0 cal gun - 23.52lbs / 10.67kg shells, 200 per gun
     Breech loading gun in deck mount, 1870 Model
     1 x Single mount on centreline, forward deck forward
      1 raised mount
      2 - 1.85" / 47.0 mm 45.0 cal guns - 2.67lbs / 1.21kg shells, 300 per gun
     Breech loading guns in deck mounts, 1870 Model
     2 x Single mounts on sides, forward deck aft
      2 - 0.51" / 13.0 mm 45.0 cal guns - 0.07lbs / 0.03kg shells, 1 000 per gun
     Breech loading guns in deck mounts, 1870 Model
     2 x Single mounts on sides, forward deck aft
      Weight of broadside 29 lbs / 13 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm         -               -
   2nd:   0.39" / 10 mm         -               -
   3rd:   0.39" / 10 mm         -               -

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 220 ihp / 164 Kw = 10.09 kts
   Range 2 000nm at 7.00 kts
   Bunker at max displacement = 59 tons (100% coal)

Complement:
   29 - 39

Cost:
   £0.016 million / $0.063 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 1.5 %
      - Guns: 4 tons, 1.5 %
   Armour: 7 tons, 2.9 %
      - Armament: 7 tons, 2.9 %
   Machinery: 54 tons, 22.4 %
   Hull, fittings & equipment: 104 tons, 43.4 %
   Fuel, ammunition & stores: 41 tons, 17.0 %
   Miscellaneous weights: 31 tons, 12.9 %
      - On freeboard deck: 2 tons
      - Above deck: 29 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     306 lbs / 139 Kg = 14.3 x 3.9 " / 100 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.43
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 9.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 91 %
         - Recoil effect (Restricted arc if above 1.00): 0.10
   Seaboat quality  (Average = 1.00): 1.83

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.610
   Length to Beam Ratio: 5.29 : 1
   'Natural speed' for length: 11.02 kts
   Power going to wave formation at top speed: 44 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): -20.00 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 %,  9.84 ft / 3.00 m,  8.53 ft / 2.60 m
      - Forward deck:   35.00 %,  5.91 ft / 1.80 m,  5.91 ft / 1.80 m
      - Aft deck:   35.00 %,  5.91 ft / 1.80 m,  5.91 ft / 1.80 m
      - Quarter deck:   15.00 %,  5.91 ft / 1.80 m,  5.91 ft / 1.80 m
      - Average freeboard:      6.38 ft / 1.94 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 78.9 %
      - Above water (accommodation/working, high = better): 77.4 %
   Waterplane Area: 1 994 Square feet or 185 Square metres
   Displacement factor (Displacement / loading): 154 %
   Structure weight / hull surface area: 38 lbs/sq ft or 187 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.26
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Misc weight: 14.1% (34t)
Half Natural Speed: 5.5kts
Sails Speed: 5.5kts+9.1kts= 12.45kts