Torpedo Boat for Peru Fleet

[Jefgte]

In charge of Peru Fleet

Here is a first 250T Torpedo Boat

Mancora, Peru Torpedo boat laid down 1897

Displacement:
   250 t light; 259 t standard; 285 t normal; 306 t full load

Dimensions: Length overall / water x beam x draught
   177.17 ft / 177.17 ft x 19.69 ft x 7.53 ft (normal load)
   54.00 m / 54.00 m x 6.00 m  x 2.30 m

Armament:
      2 - 3.00" / 76.2 mm guns in single mounts, 12.00lbs / 5.44kg shells, 1895 Model
     Quick firing guns in deck mounts
     on centreline, evenly spread

   (3"/32 cal 1895 12.00 lbs QF Deck Mount San Martin Class - Union South America)

   Weight of broadside 24 lbs / 11 kg
   Shells per gun, main battery: 250
   4 - 18.0" / 457.2 mm above water torpedoes

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

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 3 400 ihp / 2 536 Kw = 22.20 kts
   Range 1 500nm at 10.00 kts
   Bunker at max displacement = 48 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   34 - 45

Cost:
   £0.034 million / $0.138 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 1.2 %
   Armour: 2 tons, 0.5 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 2 tons, 0.5 %
      - Armour Deck: 0 tons, 0.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 164 tons, 57.4 %
   Hull, fittings & equipment: 76 tons, 26.7 %
   Fuel, ammunition & stores: 36 tons, 12.5 %
   Miscellaneous weights: 5 tons, 1.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     67 lbs / 30 Kg = 5.0 x 3.0 " / 76 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.28
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 10.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 74 %
         - Recoil effect (Restricted arc if above 1.00): 0.11
   Seaboat quality  (Average = 1.00): 1.27

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.380
   Length to Beam Ratio: 9.00 : 1
   'Natural speed' for length: 13.31 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   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:      9.84 ft / 3.00 m
      - Forecastle (18 %):   11.81 ft / 3.60 m
      - Mid (30 %):      7.55 ft / 2.30 m
      - Quarterdeck (10 %):   7.55 ft / 2.30 m
      - Stern:      7.55 ft / 2.30 m
      - Average freeboard:   8.43 ft / 2.57 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 196.4 %
      - Above water (accommodation/working, high = better): 39.5 %
   Waterplane Area: 2 126 Square feet or 198 Square metres
   Displacement factor (Displacement / loading): 25 %
   Structure weight / hull surface area: 18 lbs/sq ft or 87 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.51
      - Longitudinal: 2.36
      - Overall: 0.60
   Caution: Hull subject to strain in open-sea
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is extremely poor
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

Mancora
Punta Sal
Arica
Paracas

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Any comments...



Jef  ;)

[Borys]

Ahoj!
Looks OK.
Apart from
"Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily"
:)
But that's a SS issue :D
Borys

[Korpen]

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 196.4 %
      - Above water (accommodation/working, high = better): 39.5 %
   Any comments...



Jef  ;)

Only space to stand for the crew i see... ;)
She is nice, but I think four torpedo tubes are a bit too many for such a small ship at that year. Reducing it to two tubes should give her a bit more space as well.