Avisos Torpilleurs - Avisos

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AT1 class, France Aviso Torpilleur - Station TB laid down 1897

Aviso Torpilleurs: A1-A2-A3-A4-A5-A6-A7-A8-A9-A10-A11-A12

Displacement:
   1 540 t light; 1 591 t standard; 1 799 t normal; 1 966 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (298.28 ft / 295.28 ft) x 33.47 ft x (11.42 / 12.26 ft)
   (90.92 m / 90.00 m) x 10.20 m  x (3.48 / 3.74 m)

Armament:
      3 - 3.95" / 100 mm 45.0 cal guns - 31.13lbs / 14.12kg shells, 200 per gun
     Breech loading guns in deck mounts, 1897 Model
     3 x Single mounts on centreline, evenly spread
      2 - 2.56" / 65.0 mm 46.5 cal guns - 8.69lbs / 3.94kg shells, 500 per gun
     Quick firing guns in deck mounts, 1897 Model
     2 x Single mounts on sides amidships
      4 - 0.32" / 8.0 mm 76.0 cal guns - 0.02lbs / 0.01kg shells, 600 per gun
     Machine guns in deck mounts, 1897 Model
     4 x Single mounts on side ends, evenly spread
      2 raised mounts - superfiring
      Weight of broadside 111 lbs / 50 kg
      Main Torpedoes
      2 - 15.8" / 400 mm, 13.13 ft / 4.00 m torpedoes - 0.340 t each, 0.680 t total
   submerged bow & stern tubes
      2nd Torpedoes
      2 - 15.8" / 400 mm, 13.13 ft / 4.00 m torpedoes - 0.340 t each, 0.680 t total
   In 2 sets of deck mounted side rotating tubes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.40" / 10 mm         -               -
   2nd:   0.40" / 10 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 7 500 ihp / 5 595 Kw = 21.06 kts
   Range 4 000nm at 10.00 kts
   Bunker at max displacement = 376 tons (100% coal)

Complement:
   137 - 179

Cost:
   £0.197 million / $0.789 million

Distribution of weights at normal displacement:
   Armament: 21 tons, 1.2 %
      - Guns: 18 tons, 1.0 %
      - Weapons: 3 tons, 0.2 %
   Armour: 5 tons, 0.3 %
      - Armament: 5 tons, 0.3 %
   Machinery: 984 tons, 54.7 %
   Hull, fittings & equipment: 499 tons, 27.8 %
   Fuel, ammunition & stores: 260 tons, 14.4 %
   Miscellaneous weights: 30 tons, 1.7 %
      - On freeboard deck: 30 tons
                 2 tons for torpedoes
                 4 tons for reload torpedoes
                 24 minens


Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     729 lbs / 331 Kg = 23.6 x 4.0 " / 100 mm shells or 1.2 torpedoes
   Stability (Unstable if below 1.00): 1.73
   Metacentric height 2.4 ft / 0.7 m
   Roll period: 9.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.05
   Seaboat quality  (Average = 1.00): 1.17

Hull form characteristics:
   Hull has low forecastle, rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.558 / 0.568
   Length to Beam Ratio: 8.82 : 1
   'Natural speed' for length: 17.18 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   Bow angle (Positive = bow angles forward): -5.00 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 %,  9.85 ft / 3.00 m,  11.82 ft / 3.60 m
      - Forward deck:   10.00 %,  12.15 ft / 3.70 m,  12.15 ft / 3.70 m
      - Aft deck:   55.00 %,  9.20 ft / 2.80 m,  9.20 ft / 2.80 m
      - Quarter deck:   20.00 %,  9.20 ft / 2.80 m,  9.20 ft / 2.80 m
      - Average freeboard:      9.77 ft / 2.98 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 182.6 %
      - Above water (accommodation/working, high = better): 91.3 %
   Waterplane Area: 6 949 Square feet or 646 Square metres
   Displacement factor (Displacement / loading): 71 %
   Structure weight / hull surface area: 48 lbs/sq ft or 233 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.19
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

24tons misc weight are dispo to transport marines troops, materials, mines or complementary armament

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AT2 class, France Aviso Torpilleur - Station TB laid down 1899

Aviso Torpilleurs: A13-A14-A15-A16-A17-A18-A19-A20

Displacement:
   1 540 t light; 1 595 t standard; 1 818 t normal; 1 996 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (301.55 ft / 298.55 ft) x 34.05 ft x (11.38 / 12.26 ft)
   (91.91 m / 91.00 m) x 10.38 m  x (3.47 / 3.74 m)

Armament:
      4 - 3.95" / 100 mm 45.0 cal guns - 31.13lbs / 14.12kg shells, 200 per gun
     Breech loading guns in deck mounts, 1899 Model
     4 x Single mounts on centreline, evenly spread
      2 - 2.56" / 65.0 mm 46.5 cal guns - 8.69lbs / 3.94kg shells, 500 per gun
     Quick firing guns in deck mounts, 1899 Model
     2 x Single mounts on sides amidships
      4 - 0.32" / 8.0 mm 76.0 cal guns - 0.02lbs / 0.01kg shells, 600 per gun
     Machine guns in deck mounts, 1899 Model
     4 x Single mounts on side ends, evenly spread
      2 raised mounts - superfiring
      Weight of broadside 142 lbs / 64 kg
      Main Torpedoes
      2 - 17.7" / 450 mm, 16.15 ft / 4.92 m torpedoes - 0.550 t each, 1.100 t total
   submerged bow & stern tubes
      2nd Torpedoes
      2 - 17.7" / 450 mm, 16.15 ft / 4.92 m torpedoes - 0.550 t each, 1.100 t total
   In 2 sets of deck mounted side rotating tubes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.40" / 10 mm         -               -
   2nd:   0.40" / 10 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 7 500 ihp / 5 595 Kw = 21.06 kts
   Range 4 400nm at 10.00 kts
             7 140nm at 8.00 kts
   Bunker at max displacement = 401 tons (100% coal)

Complement:
   138 - 180

Cost:
   £0.198 million / $0.790 million

Distribution of weights at normal displacement:
   Armament: 28 tons, 1.5 %
      - Guns: 23 tons, 1.3 %
      - Weapons: 4 tons, 0.2 %
   Armour: 5 tons, 0.3 %
      - Armament: 5 tons, 0.3 %
   Machinery: 976 tons, 53.7 %
   Hull, fittings & equipment: 502 tons, 27.6 %
   Fuel, ammunition & stores: 278 tons, 15.3 %
   Miscellaneous weights: 30 tons, 1.7 %
      - On freeboard deck: 30 tons
                 2 tons for torpedoes
                 4 tons for reload torpedoes
                 24 minens


Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     756 lbs / 343 Kg = 24.5 x 4.0 " / 100 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.74
   Metacentric height 2.5 ft / 0.8 m
   Roll period: 9.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.06
   Seaboat quality  (Average = 1.00): 1.19

Hull form characteristics:
   Hull has low forecastle, rise forward of midbreak,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.561
   Length to Beam Ratio: 8.77 : 1
   'Natural speed' for length: 17.28 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   Bow angle (Positive = bow angles forward): -5.00 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 %,  11.17 ft / 3.40 m,  10.18 ft / 3.10 m
      - Forward deck:   6.00 %,  11.82 ft / 3.60 m,  11.82 ft / 3.60 m
      - Aft deck:   59.00 %,  9.50 ft / 2.90 m,  9.50 ft / 2.90 m
      - Quarter deck:   20.00 %,  9.50 ft / 2.90 m,  9.20 ft / 2.80 m
      - Average freeboard:      9.77 ft / 2.98 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 181.5 %
      - Above water (accommodation/working, high = better): 92.2 %
   Waterplane Area: 7 094 Square feet or 659 Square metres
   Displacement factor (Displacement / loading): 73 %
   Structure weight / hull surface area: 48 lbs/sq ft or 232 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.18
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

24 tons misc weight are dispo to transport marines troops, materials, mines or complementary armament

[Jefgte]

France AT3 class laid down 1900

Aviso Torpilleurs: A21-A22-A23-A24-A25-A26

Displacement:
   4 200 t light; 4 324 t standard; 4 930 t normal; 5 414 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (393.50 ft / 388.50 ft) x 48.55 ft x (16.48 / 17.76 ft)
   (119.94 m / 118.41 m) x 14.80 m  x (5.02 / 5.41 m)

Armament:
      3 - 5.50" / 140 mm 45.0 cal guns - 83.91lbs / 38.06kg shells, 150 per gun
     Breech loading guns in deck and hoist mounts, 1900 Model
     3 x Single mounts on centreline, evenly spread
      2 - 3.95" / 100 mm 45.0 cal guns - 31.09lbs / 14.10kg shells, 130 per gun
     Breech loading guns in deck mounts, 1900 Model
     2 x Single mounts on sides, forward deck aft
      4 - 0.32" / 8.0 mm 76.0 cal guns - 0.02lbs / 0.01kg shells, 500 per gun
     Machine guns in deck mounts, 1900 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 314 lbs / 142 kg
      Main Torpedoes
      2 - 17.7" / 450 mm, 16.15 ft / 4.92 m torpedoes - 0.570 t each, 1.140 t total
   submerged bow & stern tubes
      2nd Torpedoes
      2 - 17.7" / 450 mm, 16.15 ft / 4.92 m torpedoes - 0.570 t each, 1.140 t total
   In 2 sets of deck mounted carriage/fixed tubes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.99" / 25 mm         -         0.99" / 25 mm
   2nd:   0.40" / 10 mm         -               -
   4th:   0.40" / 10 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 17 750 ihp / 13 241 Kw = 22.90 kts
   Range 6 700nm at 10.00 kts
   Bunker at max displacement = 1 089 tons (100% coal)

Complement:
   293 - 382

Cost:
   £0.561 million / $2.245 million

Distribution of weights at normal displacement:
   Armament: 81 tons, 1.6 %
      - Guns: 77 tons, 1.6 %
      - Weapons: 4 tons, 0.1 %
   Armour: 15 tons, 0.3 %
      - Armament: 15 tons, 0.3 %
   Machinery: 2 767 tons, 56.1 %
   Hull, fittings & equipment: 1 283 tons, 26.0 %
   Fuel, ammunition & stores: 729 tons, 14.8 %
   Miscellaneous weights: 55 tons, 1.1 %
      - Hull below water: 5 tons
      - On freeboard deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1 850 lbs / 839 Kg = 22.2 x 5.5 " / 140 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.89
   Metacentric height 4.7 ft / 1.4 m
   Roll period: 9.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 74 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality  (Average = 1.00): 1.24

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.555 / 0.566
   Length to Beam Ratio: 8.00 : 1
   'Natural speed' for length: 19.71 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   Bow angle (Positive = bow angles forward): -5.00 degrees
   Stern overhang: 1.00 ft / 0.30 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  14.78 ft / 4.50 m,  12.78 ft / 3.90 m
      - Forward deck:   30.00 %,  12.78 ft / 3.90 m,  11.80 ft / 3.60 m
      - Aft deck:   30.00 %,  11.80 ft / 3.60 m,  11.80 ft / 3.60 m
      - Quarter deck:   20.00 %,  11.80 ft / 3.60 m,  11.80 ft / 3.60 m
      - Average freeboard:      12.30 ft / 3.75 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 187.8 %
      - Above water (accommodation/working, high = better): 103.2 %
   Waterplane Area: 13 225 Square feet or 1 229 Square metres
   Displacement factor (Displacement / loading): 84 %
   Structure weight / hull surface area: 67 lbs/sq ft or 329 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.22
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Misc weight
5t for 8 torp
50 tons misc weight are dispo to transport marines troops, materials, 50 mines or complementary armament