Iberian Torpedo Boat

[miketr]

Not that I will build any of these but I wanted to see how small of a torpedo boat I could build.  The 300 ton design is so much better so odds are I will build that and 750 ton boats next year.  Still maybe someone else could find a use for something like this.

Michael

TB-1909-Tiny, Iberia Torpedo Boat laid down 1909

Displacement:
   200 t light; 204 t standard; 212 t normal; 217 t full load

Dimensions: Length overall / water x beam x draught
   175.00 ft / 175.00 ft x 15.00 ft x 6.00 ft (normal load)
   53.34 m / 53.34 m x 4.57 m  x 1.83 m

Armament:
      1 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1909 Model
     Quick firing gun in deck mount
     on centreline forward
   Weight of broadside 2 lbs / 1 kg
   Shells per gun, main battery: 150
   2 - 20.0" / 508 mm above water torpedoes

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

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 2 shafts, 6,658 shp / 4,967 Kw = 27.00 kts
   Range 500nm at 10.00 kts
   Bunker at max displacement = 13 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   27 - 36

Cost:
   £0.024 million / $0.096 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.1 %
   Armour: 0 tons, 0.2 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 0 tons, 0.2 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 121 tons, 57.1 %
   Hull, fittings & equipment: 77 tons, 36.3 %
   Fuel, ammunition & stores: 11 tons, 5.4 %
   Miscellaneous weights: 2 tons, 0.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     63 lbs / 28 Kg = 32.1 x 1.6 " / 40 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 0.4 ft / 0.1 m
   Roll period: 10.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.470
   Length to Beam Ratio: 11.67 : 1
   'Natural speed' for length: 13.23 kts
   Power going to wave formation at top speed: 72 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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:      10.25 ft / 3.12 m
      - Forecastle (20 %):   9.00 ft / 2.74 m
      - Mid (50 %):      9.00 ft / 2.74 m
      - Quarterdeck (15 %):   9.00 ft / 2.74 m
      - Stern:      9.00 ft / 2.74 m
      - Average freeboard:   9.10 ft / 2.77 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 186.1 %
      - Above water (accommodation/working, high = better): 56.6 %
   Waterplane Area: 1,703 Square feet or 158 Square metres
   Displacement factor (Displacement / loading): 32 %
   Structure weight / hull surface area: 16 lbs/sq ft or 80 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 5.13
      - Overall: 0.63
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped

2 tons for two 20" torpedo tubes

[Carthaginian]

I've been shooting for a 250t design myself, to export to smaller countries or to start refurbishing my own forces with. Haven't had too much success, though... I might have to just look up something historical and use it. There were some nice 100t historical designs.