Torpedo Boats

[Guinness]

30 Boats (TB-01 - TB-30)


TB-01, CSA Coastal Torpedo Boat laid down 1913 (Engine 1912)

Displacement:
   250 t light; 259 t standard; 309 t normal; 349 t full load

Dimensions: Length overall / water x beam x draught
   224.00 ft / 216.00 ft x 18.00 ft x 6.63 ft (normal load)
   68.27 m / 65.84 m x 5.49 m  x 2.02 m

Armament:
      2 - 3.50" / 88.9 mm guns in single mounts, 20.00lbs / 9.07kg shells, 1913 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread
      2 - 1.00" / 25.4 mm guns (1x2 guns), 0.50lbs / 0.23kg shells, 1913 Model
     Breech loading guns in deck mount
     on centreline aft
   Weight of broadside 41 lbs / 19 kg
   Shells per gun, main battery: 112
   3 - 20.0" / 508 mm above water torpedoes

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 8,500 shp / 6,341 Kw = 28.08 kts
   Range 1,970nm at 15.00 kts
   Bunker at max displacement = 90 tons

Complement:
   36 - 47

Cost:
   £0.039 million / $0.156 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 1.8 %
   Machinery: 160 tons, 51.7 %
   Hull, fittings & equipment: 81 tons, 26.1 %
   Fuel, ammunition & stores: 59 tons, 19.1 %
   Miscellaneous weights: 4 tons, 1.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     71 lbs / 32 Kg = 3.3 x 3.5 " / 89 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 0.5 ft / 0.2 m
   Roll period: 10.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 56 %
         - Recoil effect (Restricted arc if above 1.00): 0.20
   Seaboat quality  (Average = 1.00): 0.72

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.420
   Length to Beam Ratio: 12.00 : 1
   'Natural speed' for length: 14.70 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 78
   Bow angle (Positive = bow angles forward): 30.25 degrees
   Stern overhang: 1.00 ft / 0.30 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      12.00 ft / 3.66 m
      - Forecastle (20 %):   9.25 ft / 2.82 m
      - Mid (40 %):      7.00 ft / 2.13 m
      - Quarterdeck (20 %):   5.75 ft / 1.75 m
      - Stern:      5.75 ft / 1.75 m
      - Average freeboard:   7.40 ft / 2.25 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 181.6 %
      - Above water (accommodation/working, high = better): 46.2 %
   Waterplane Area: 2,424 Square feet or 225 Square metres
   Displacement factor (Displacement / loading): 43 %
   Structure weight / hull surface area: 17 lbs/sq ft or 85 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.18
      - Overall: 0.54
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Note: Forward 3.5" mount carries an unarmored spray shield.
Misc Weights: 3 torpedoes, 1 ton reserve
Range at max speed: 310 nm, 11 hours