Torpedo Boats

[miketr]

Torpedo Boats and Torpedo Boat Destroyers

1909 TB500 Class
TB-500-A
TB-500-B
TB-500-C
TB-500-D

1909 TB250 Class
TB-250-A
TB-250-B
TB-250-C
TB-250-D
TB-250-E
TB-250-F
TB-250-G
TB-250-H
TB-250-I
TB-250-J
TB-250-K
TB-250-L
TB-250-M
TB-250-N
TB-250-O
TB-250-P

[miketr]

1909 TB-500 Class

Intended to function as leaders for the small TB-250 class.

Bharat Destroyer laid down 1909

Displacement:
   500 t light; 521 t standard; 619 t normal; 697 t full load

Dimensions: Length overall / water x beam x draught
   260.00 ft / 260.00 ft x 26.00 ft x 9.05 ft (normal load)
   79.25 m / 79.25 m x 7.92 m  x 2.76 m

Armament:
      2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1909 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread
      2 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1909 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread, all raised mounts
      2 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1909 Model
     Quick firing guns in deck mounts
     on side, evenly spread
      4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1909 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 85 lbs / 39 kg
   Shells per gun, main battery: 150
   4 - 17.7" / 449.58 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.50" / 13 mm         -               -

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 11,735 shp / 8,755 Kw = 28.00 kts
   Range 4,250nm at 10.00 kts
   Bunker at max displacement = 176 tons (90% coal)

Complement:
   61 - 80

Cost:
   £0.070 million / $0.279 million

Distribution of weights at normal displacement:
   Armament: 11 tons, 1.7 %
   Armour: 2 tons, 0.4 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 2 tons, 0.4 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 309 tons, 50.0 %
   Hull, fittings & equipment: 158 tons, 25.6 %
   Fuel, ammunition & stores: 118 tons, 19.1 %
   Miscellaneous weights: 20 tons, 3.2 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     171 lbs / 78 Kg = 4.8 x 4.1 " / 105 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.34
   Metacentric height 1.1 ft / 0.3 m
   Roll period: 9.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.21
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.400
   Length to Beam Ratio: 11.30 : 1
   'Natural speed' for length: 16.12 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   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:      16.00 ft / 4.88 m
      - Forecastle (30 %):   10.00 ft / 3.05 m
      - Mid (40 %):      10.00 ft / 3.05 m
      - Quarterdeck (15 %):   8.00 ft / 2.44 m
      - Stern:      8.00 ft / 2.44 m
      - Average freeboard:   9.97 ft / 3.04 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 178.3 %
      - Above water (accommodation/working, high = better): 84.7 %
   Waterplane Area: 4,161 Square feet or 387 Square metres
   Displacement factor (Displacement / loading): 49 %
   Structure weight / hull surface area: 21 lbs/sq ft or 105 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.35
      - Overall: 0.55
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

[miketr]

1909 TB-250 Class

Intended to operate with the larger TB-500's these torpedo boats provide coast and harbor defense for Bharat.

Sembawang KTB-3.5, Bharat Torpedoboot laid down 1909

Displacement:
   250 t light; 258 t standard; 303 t normal; 339 t full load

Dimensions: Length overall / water x beam x draught
   229,52 ft / 223,10 ft x 18,59 ft x 6,73 ft (normal load)
   69,96 m / 68,00 m x 5,67 m  x 2,05 m

Armament:
      2 - 2,24" / 57,0 mm guns in single mounts, 5,65lbs / 2,56kg shells, 1909 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      2 - 0,31" / 8,0 mm guns in single mounts, 0,02lbs / 0,01kg shells, 1909 Model
     Machine guns in deck mounts
     on side, all amidships
   Weight of broadside 11 lbs / 5 kg
   Shells per gun, main battery: 200
   3 - 17,7" / 450 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0,20" / 5 mm         -               -

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 7 922 shp / 5 910 Kw = 28,00 kts
   Range 3 000nm at 10,00 kts
   Bunker at max displacement = 81 tons (90% coal)

Complement:
   36 - 47

Cost:
   £0,033 million / $0,133 million

Distribution of weights at normal displacement:
   Armament: 1 tons, 0,5 %
   Armour: 0 tons, 0,1 %
      - Belts: 0 tons, 0,0 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 0 tons, 0,1 %
      - Armour Deck: 0 tons, 0,0 %
      - Conning Tower: 0 tons, 0,0 %
   Machinery: 167 tons, 55,1 %
   Hull, fittings & equipment: 79 tons, 26,0 %
   Fuel, ammunition & stores: 53 tons, 17,3 %
   Miscellaneous weights: 3 tons, 1,0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     66 lbs / 30 Kg = 11,7 x 2,2 " / 57 mm shells or 0,1 torpedoes
   Stability (Unstable if below 1.00): 1,17
   Metacentric height 0,5 ft / 0,2 m
   Roll period: 10,7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0,05
   Seaboat quality  (Average = 1.00): 0,81

Hull form characteristics:
   Hull has raised forecastle, rise forward of midbreak
   Block coefficient: 0,380
   Length to Beam Ratio: 12,00 : 1
   'Natural speed' for length: 14,94 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 87
   Bow angle (Positive = bow angles forward): 26,00 degrees
   Stern overhang: 0,82 ft / 0,25 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      11,48 ft / 3,50 m
      - Forecastle (20 %):   11,48 ft / 3,50 m (6,56 ft / 2,00 m aft of break)
      - Mid (30 %):      6,56 ft / 2,00 m (6,23 ft / 1,90 m aft of break)
      - Quarterdeck (15 %):   6,23 ft / 1,90 m
      - Stern:      7,38 ft / 2,25 m
      - Average freeboard:   7,40 ft / 2,26 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 182,8 %
      - Above water (accommodation/working, high = better): 54,2 %
   Waterplane Area: 2 528 Square feet or 235 Square metres
   Displacement factor (Displacement / loading): 38 %
   Structure weight / hull surface area: 17 lbs/sq ft or 81 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,50
      - Longitudinal: 1,07
      - Overall: 0,54
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather