200t Coastal Torpedo Boat

[Jefgte]

Use for coastal operations & harbors protection
2 CTBs per year.

200t, Peru CTB laid down 1915 (Engine 1912)

Displacement:
   200 t light; 205 t standard; 221 t normal; 233 t full load

Dimensions: Length overall / water x beam x draught
   178.31 ft / 177.17 ft x 16.88 ft x 6.55 ft (normal load)
   54.35 m / 54.00 m x 5.15 m  x 2.00 m

Armament:
      1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1915 Model
     Quick firing gun in deck mount
     on centreline forward
      2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1915 Model
     Machine guns in deck mounts
     on side, evenly spread
   Weight of broadside 14 lbs / 6 kg
   Shells per gun, main battery: 150
   2 - 18.0" / 457.2 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm         -               -
   2nd:   0.50" / 13 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 6 616 shp / 4 936 Kw = 27.04 kts
   Range  115nm at 27.00 kts
                150nm at 25.00 kts
                260nm at 21.00 kts
                1225nm at 12.00 kts
   Bunker at max displacement = 28 tons

Complement:
   28 - 37

Cost:
   £0.036 million / $0.146 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 0.8 %
   Armour: 1 tons, 0.6 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 1 tons, 0.6 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 119 tons, 53.8 %
   Hull, fittings & equipment: 74 tons, 33.4 %
   Fuel, ammunition & stores: 21 tons, 9.6 %
   Miscellaneous weights: 4 tons, 1.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     62 lbs / 28 Kg = 4.6 x 3.0 " / 76 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 0.4 ft / 0.1 m
   Roll period: 10.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 61 %
         - Recoil effect (Restricted arc if above 1.00): 0.11
   Seaboat quality  (Average = 1.00): 0.89

Hull form characteristics:
   Hull has raised forecastle
   Block coefficient: 0.395
   Length to Beam Ratio: 10.50 : 1
   'Natural speed' for length: 13.31 kts
   Power going to wave formation at top speed: 71 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      13.12 ft / 4.00 m
      - Forecastle (18 %):   11.15 ft / 3.40 m (10.17 ft / 3.10 m aft of break)
      - Mid (40 %):      7.55 ft / 2.30 m
      - Quarterdeck (15 %):   7.22 ft / 2.20 m
      - Stern:      6.56 ft / 2.00 m
      - Average freeboard:   8.45 ft / 2.58 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): 65.0 %
   Waterplane Area: 1 836 Square feet or 171 Square metres
   Displacement factor (Displacement / loading): 40 %
   Structure weight / hull surface area: 17 lbs/sq ft or 85 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 3.29
      - Overall: 0.61
   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

[The Rock Doctor]

That's not bad.