1911 Torpedo Boat

[Kaiser Kirk]

TB-1, Inca Torpedo Gunboat laid down 1911

Displacement:
   250 t light; 258 t standard; 301 t normal; 335 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (180.45 ft / 177.17 ft) x 19.69 ft x (7.55 / 8.14 ft)
   (55.00 m / 54.00 m) x 6.00 m  x (2.30 / 2.48 m)

Armament:
      2 - 2.56" / 65.0 mm 50.0 cal guns - 8.82lbs / 4.00kg shells, 200 per gun
     Quick firing guns in deck mounts, 1909 Model
     1 x Single mount on centreline, forward evenly spread
      1 raised mount
     1 x Single mount on centreline, aft evenly spread
      Weight of broadside 18 lbs / 8 kg

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

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 1 shaft, 6,450 shp / 4,812 Kw = 25.50 kts
   Range 2,000nm at 12.00 kts
   Bunker at max displacement = 78 tons (100% coal)

Complement:
   35 - 46

Cost:
   £0.032 million / $0.127 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 1.3 %
   Armour: 2 tons, 0.6 %
      - Armament: 2 tons, 0.6 %
   Machinery: 158 tons, 52.5 %
   Hull, fittings & equipment: 78 tons, 26.0 %
   Fuel, ammunition & stores: 51 tons, 17.0 %
   Miscellaneous weights: 8 tons, 2.7 %
      - On freeboard deck: 8 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     91 lbs / 41 Kg = 10.9 x 2.6 " / 65 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.47
   Metacentric height 0.9 ft / 0.3 m
   Roll period: 9.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 44 %
         - Recoil effect (Restricted arc if above 1.00): 0.08
   Seaboat quality  (Average = 1.00): 0.79

Hull form characteristics:
   Hull has raised forecastle,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.400 / 0.413
   Length to Beam Ratio: 9.00 : 1
   'Natural speed' for length: 13.31 kts
   Power going to wave formation at top speed: 70 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): -10.00 degrees
   Stern overhang: -3.28 ft / -1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   25.00 %,  11.29 ft / 3.44 m,  11.29 ft / 3.44 m
      - Forward deck:   30.00 %,  8.01 ft / 2.44 m,  8.01 ft / 2.44 m
      - Aft deck:   30.00 %,  8.01 ft / 2.44 m,  8.01 ft / 2.44 m
      - Quarter deck:   15.00 %,  8.01 ft / 2.44 m,  8.01 ft / 2.44 m
      - Average freeboard:      8.83 ft / 2.69 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 173.1 %
      - Above water (accommodation/working, high = better): 88.4 %
   Waterplane Area: 2,030 Square feet or 189 Square metres
   Displacement factor (Displacement / loading): 51 %
   Structure weight / hull surface area: 18 lbs/sq ft or 89 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 2.69
      - Overall: 0.59
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather


Miscellaneous weight is as follows :
8t - 4x 450mm torpedoes. Two torpedoes fire forward from the "cheeks" like an E-boat, and two on a turntable in the rear.


Trial Speed: 29.88