TB Examples?

[miketr]

Looking at things the first TBD doesn't appear till the 1890's but TB's were being made by France in the 1870's.  Granted they were little more than coast defense boats with next to no range and spar - torpedo's but they were there.  The first real torpedo boat doesn't look to appear till 1880 or so.

So if people could try to create a Torpedo Boat with the following inputs.

33 x 3.28 x 1.1 meter, 20 knots.  Two 15" torpedo's.  Lay down date late 1880. 

Let see what is needed to make these light designs work.

Guinness again holds the feeling that if we accept very poor seakeeping we can make torpedo boats.

Michael

[Carthaginian]

OK... not too good with metric and shipbuilding, so I rounded a bit and put thing into feet/inches.
You can do it and not even get horrible seakeeping actually. Sure, the SS warning for 'poor seaboat' comes up, but it's not like anyone expected anything else.

Range is literally 'out to the mouth of the harbor and back.'

TB-1880, Acadie Coastal Torpedo Boat laid down 1880

Displacement:
   65 t light; 67 t standard; 70 t normal; 73 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (110.00 ft / 110.00 ft) x 10.00 ft x (4.00 / 4.12 ft)
   (33.53 m / 33.53 m) x 3.05 m  x (1.22 / 1.26 m)

Armament:
      Main Torpedoes
      2 - 15.0" / 381 mm, 15.00 ft / 4.57 m torpedoes - 0.178 t each, 0.355 t total
   In 2 sets of deck mounted carriage/fixed tubes

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 1,400 ihp / 1,044 Kw = 20.04 kts
   Range 30nm at 20.00 kts
   Bunker at max displacement = 6 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   11 - 15

Cost:
   £0.009 million / $0.034 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.6 %
      - Weapons: 0 tons, 0.6 %
   Machinery: 45 tons, 64.4 %
   Hull, fittings & equipment: 20 tons, 28.3 %
   Fuel, ammunition & stores: 5 tons, 6.6 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11 lbs / 5 Kg = 0.1 x 6 " / 152 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.14
   Metacentric height 0.2 ft / 0.1 m
   Roll period: 9.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 0.70

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.557 / 0.561
   Length to Beam Ratio: 11.00 : 1
   'Natural speed' for length: 10.49 kts
   Power going to wave formation at top speed: 72 %
   Trim (Max stability = 0, Max steadiness = 100): 73
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   25.00 %,  6.00 ft / 1.83 m,  5.50 ft / 1.68 m
      - Forward deck:   25.00 %,  5.50 ft / 1.68 m,  5.00 ft / 1.52 m
      - Aft deck:   25.00 %,  5.00 ft / 1.52 m,  4.50 ft / 1.37 m
      - Quarter deck:   25.00 %,  4.50 ft / 1.37 m,  4.00 ft / 1.22 m
      - Average freeboard:      4.99 ft / 1.52 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 207.7 %
      - Above water (accommodation/working, high = better): 63.6 %
   Waterplane Area: 773 Square feet or 72 Square metres
   Displacement factor (Displacement / loading): 12 %
   Structure weight / hull surface area: 12 lbs/sq ft or 57 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 2.09
      - Overall: 0.57
   Caution: Hull subject to strain in open-sea
   Extremely poor machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[Tanthalas]

Basing on HMS Lightning are we, personaly I like Vesuvius better but here it is mostly within your request (I gave her a couple feet more draught and 6' still is realy realy shalow IMHO.

TB-1880, Deseret Torpedo Boat laid down 1880

Displacement:
   107 t light; 110 t standard; 115 t normal; 119 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (110.00 ft / 110.00 ft) x 11.00 ft x (6.00 / 6.18 ft)
   (33.53 m / 33.53 m) x 3.35 m  x (1.83 / 1.88 m)

Armament:
      Main Torpedoes
      2 - 15.0" / 381 mm, 12.00 ft / 3.66 m torpedoes - 0.134 t each, 0.268 t total
   In 2 sets of deck mounted carriage/fixed tubes

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   No drive to shaft, 2 shafts, 1,946 ihp / 1,452 Kw = 20.00 kts
   Range 300nm at 10.00 kts
   Bunker at max displacement = 10 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   16 - 22

Cost:
   £0.014 million / $0.056 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.3 %
      - Weapons: 0 tons, 0.3 %
   Machinery: 73 tons, 63.1 %
   Hull, fittings & equipment: 34 tons, 29.8 %
   Fuel, ammunition & stores: 8 tons, 6.7 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     18 lbs / 8 Kg = 0.2 x 6 " / 152 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 0.2 ft / 0.1 m
   Roll period: 9.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has raised forecastle,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.554 / 0.559
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 10.49 kts
   Power going to wave formation at top speed: 74 %
   Trim (Max stability = 0, Max steadiness = 100): 59
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  8.00 ft / 2.44 m,  12.00 ft / 3.66 m
      - Forward deck:   30.00 %,  6.00 ft / 1.83 m,  6.00 ft / 1.83 m
      - Aft deck:   35.00 %,  6.00 ft / 1.83 m,  6.00 ft / 1.83 m
      - Quarter deck:   15.00 %,  6.00 ft / 1.83 m,  6.00 ft / 1.83 m
      - Average freeboard:      6.88 ft / 2.10 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 203.7 %
      - Above water (accommodation/working, high = better): 58.4 %
   Waterplane Area: 848 Square feet or 79 Square metres
   Displacement factor (Displacement / loading): 14 %
   Structure weight / hull surface area: 14 lbs/sq ft or 68 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 5.99
      - Overall: 0.64
   Caution: Hull subject to strain in open-sea
   Extremely poor machinery, storage, compartmentation space
   Cramped accommodation and workspace room

[Tanthalas]

or the version thats more or less totaly compliant.

TB-1880, Deseret Torpedo Boat laid down 1880

Displacement:
   79 t light; 81 t standard; 83 t normal; 85 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (110.00 ft / 110.00 ft) x 11.00 ft x (4.00 / 4.08 ft)
   (33.53 m / 33.53 m) x 3.35 m  x (1.22 / 1.24 m)

Armament:
      Main Torpedoes
      2 - 15.0" / 381 mm, 12.00 ft / 3.66 m torpedoes - 0.134 t each, 0.268 t total
   In 2 sets of deck mounted carriage/fixed tubes

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 1,622 ihp / 1,210 Kw = 20.00 kts
   Range 150nm at 10.00 kts
   Bunker at max displacement = 4 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   13 - 17

Cost:
   £0.010 million / $0.041 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.4 %
      - Weapons: 0 tons, 0.4 %
   Machinery: 53 tons, 64.2 %
   Hull, fittings & equipment: 25 tons, 30.4 %
   Fuel, ammunition & stores: 4 tons, 4.9 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     13 lbs / 6 Kg = 0.1 x 6 " / 152 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 0.2 ft / 0.1 m
   Roll period: 9.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 57 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 0.81

Hull form characteristics:
   Hull has raised forecastle,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.603
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 10.49 kts
   Power going to wave formation at top speed: 74 %
   Trim (Max stability = 0, Max steadiness = 100): 71
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  8.00 ft / 2.44 m,  12.00 ft / 3.66 m
      - Forward deck:   30.00 %,  5.00 ft / 1.52 m,  5.00 ft / 1.52 m
      - Aft deck:   35.00 %,  5.00 ft / 1.52 m,  5.00 ft / 1.52 m
      - Quarter deck:   15.00 %,  5.00 ft / 1.52 m,  5.00 ft / 1.52 m
      - Average freeboard:      6.08 ft / 1.85 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 207.2 %
      - Above water (accommodation/working, high = better): 62.6 %
   Waterplane Area: 885 Square feet or 82 Square metres
   Displacement factor (Displacement / loading): 12 %
   Structure weight / hull surface area: 12 lbs/sq ft or 60 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 3.39
      - Overall: 0.60
   Caution: Hull subject to strain in open-sea
   Extremely poor machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Poor seaboat, wet and uncomfortable

[Valles]

Pointless, Japanese Torpedo Boat laid down 1880

Displacement:
   63 t light; 65 t standard; 66 t normal; 66 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (112.18 ft / 108.27 ft) x 10.76 ft x (3.61 / 3.64 ft)
   (34.19 m / 33.00 m) x 3.28 m  x (1.10 / 1.11 m)

Armament:
      Main Torpedoes
      2 - 17.7" / 450 mm, 19.69 ft / 6.00 m torpedoes - 0.358 t each, 0.717 t total
   In 2 sets of deck mounted carriage/fixed tubes

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 1 shaft, 1,364 ihp / 1,018 Kw = 20.00 kts
   Range 100nm at 8.00 kts
   Bunker at max displacement = 2 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   10 - 14

Cost:
   £0.008 million / $0.032 million

Distribution of weights at normal displacement:
   Armament: 1 tons, 1.4 %
      - Weapons: 1 tons, 1.4 %
   Machinery: 42 tons, 64.3 %
   Hull, fittings & equipment: 16 tons, 24.7 %
   Fuel, ammunition & stores: 2 tons, 3.5 %
   Miscellaneous weights: 4 tons, 6.1 %
      - On freeboard deck: 4 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     8 lbs / 4 Kg = 0.1 x 6 " / 152 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.02
   Metacentric height 0.2 ft / 0.1 m
   Roll period: 10.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 26 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 0.15

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.546 / 0.547
   Length to Beam Ratio: 10.06 : 1
   'Natural speed' for length: 10.41 kts
   Power going to wave formation at top speed: 73 %
   Trim (Max stability = 0, Max steadiness = 100): 90
   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:   20.00 %,  3.61 ft / 1.10 m,  3.28 ft / 1.00 m
      - Forward deck:   30.00 %,  3.28 ft / 1.00 m,  2.95 ft / 0.90 m
      - Aft deck:   35.00 %,  2.95 ft / 0.90 m,  2.95 ft / 0.90 m
      - Quarter deck:   15.00 %,  2.95 ft / 0.90 m,  2.95 ft / 0.90 m
      - Average freeboard:      3.09 ft / 0.94 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 207.4 %
      - Above water (accommodation/working, high = better): 41.9 %
   Waterplane Area: 785 Square feet or 73 Square metres
   Displacement factor (Displacement / loading): 12 %
   Structure weight / hull surface area: 13 lbs/sq ft or 64 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.62
      - Longitudinal: 0.64
      - Overall: 0.62
   Caution: Hull subject to strain in open-sea
   Extremely poor machinery, storage, compartmentation space
   Extremely poor accommodation and workspace room
   Ship has quick, lively roll, not a steady gun platform
   Caution: Lacks seaworthiness - very limited seakeeping ability


...I don't think that it quite works.

[Logi]

I had to tweak the parameters a bit; give it 2 extra ft in waterline and 0.2 ft in draught, but it works... kinda.

The seakeeping is not great, but it's barely 0.70 (poor seaboat but can operate in calm seas out on the ocean). To make these designs work, you need fine BCs, 0.43-0.50 is the zone. That's fine for a cruiser or battleships (too fine actually), but this is the correct historical BC zone for destroyers / torpedo boats.

TB-1880, Iberian Torpedo Boat laid down 1880

Displacement:
   57 t light; 58 t standard; 59 t normal; 60 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (110.00 ft / 110.00 ft) x 11.00 ft x (3.80 / 3.85 ft)
   (33.53 m / 33.53 m) x 3.35 m  x (1.16 / 1.17 m)

Armament:
      Main Torpedoes
      2 - 15.0" / 381 mm, 15.00 ft / 4.57 m torpedoes - 0.178 t each, 0.355 t total
   In 2 sets of deck mounted carriage/fixed tubes

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 1,188 ihp / 886 Kw = 20.00 kts
   Range 102nm at 10.00 kts
   Bunker at max displacement = 2 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   9 - 13

Cost:
   £0.007 million / $0.029 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.8 %
      - Weapons: 0 tons, 0.8 %
   Machinery: 38 tons, 64.5 %
   Hull, fittings & equipment: 18 tons, 30.5 %
   Fuel, ammunition & stores: 3 tons, 4.3 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     10 lbs / 5 Kg = 0.1 x 6 " / 152 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.28
   Metacentric height 0.3 ft / 0.1 m
   Roll period: 8.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 0.71

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.450 / 0.452
   Length to Beam Ratio: 10.00 : 1
   'Natural speed' for length: 10.49 kts
   Power going to wave formation at top speed: 70 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  6.00 ft / 1.83 m,  5.00 ft / 1.52 m
      - Forward deck:   30.00 %,  5.00 ft / 1.52 m,  4.50 ft / 1.37 m
      - Aft deck:   35.00 %,  4.50 ft / 1.37 m,  4.50 ft / 1.37 m
      - Quarter deck:   15.00 %,  4.50 ft / 1.37 m,  4.50 ft / 1.37 m
      - Average freeboard:      4.76 ft / 1.45 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 207.8 %
      - Above water (accommodation/working, high = better): 71.7 %
   Waterplane Area: 772 Square feet or 72 Square metres
   Displacement factor (Displacement / loading): 12 %
   Structure weight / hull surface area: 12 lbs/sq ft or 58 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.70
      - Overall: 0.56
   Caution: Hull subject to strain in open-sea
   Extremely poor machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[Logi]

Or here's a less compliant version with +10 ft waterline length and +1.4 ft draught:

32nm @ 20 kts
246nm @ 10 kts

It has 1.01 seakeeping and 70 steadiness.

TB-1880, Iberian Torpedo Boat laid down 1880

Displacement:
   80 t light; 81 t standard; 85 t normal; 88 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (120.00 ft / 120.00 ft) x 11.00 ft x (5.00 / 5.12 ft)
   (36.58 m / 36.58 m) x 3.35 m  x (1.52 / 1.56 m)

Armament:
      Main Torpedoes
      2 - 15.0" / 381 mm, 15.00 ft / 4.57 m torpedoes - 0.178 t each, 0.355 t total
   In 2 sets of deck mounted carriage/fixed tubes

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 1,401 ihp / 1,045 Kw = 20.00 kts
   Range 32nm at 20.00 kts
   Bunker at max displacement = 6 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   13 - 18

Cost:
   £0.010 million / $0.041 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.5 %
      - Weapons: 0 tons, 0.5 %
   Machinery: 53 tons, 63.0 %
   Hull, fittings & equipment: 26 tons, 30.3 %
   Fuel, ammunition & stores: 5 tons, 6.2 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     14 lbs / 6 Kg = 0.2 x 6 " / 152 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 0.2 ft / 0.1 m
   Roll period: 9.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.450 / 0.454
   Length to Beam Ratio: 10.91 : 1
   'Natural speed' for length: 10.95 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  6.10 ft / 1.86 m,  6.00 ft / 1.83 m
      - Forward deck:   30.00 %,  6.00 ft / 1.83 m,  5.50 ft / 1.68 m
      - Aft deck:   35.00 %,  5.50 ft / 1.68 m,  5.00 ft / 1.52 m
      - Quarter deck:   15.00 %,  5.00 ft / 1.52 m,  5.00 ft / 1.52 m
      - Average freeboard:      5.52 ft / 1.68 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 203.1 %
      - Above water (accommodation/working, high = better): 64.6 %
   Waterplane Area: 842 Square feet or 78 Square metres
   Displacement factor (Displacement / loading): 15 %
   Structure weight / hull surface area: 13 lbs/sq ft or 63 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 2.54
      - Overall: 0.59
   Caution: Hull subject to strain in open-sea
   Extremely poor machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[Carthaginian]

I think that if we try to make the range realistic (25 or 30 n.mi.) we can build some pretty useful little harbor boats in this time period. I torpedo boats can be very useful and historically correct if we don't try and abuse them.

[Jefgte]

For memory the French TB plan...

French TBs
The first one are strictly the N°1 - 9 & 41

http://fr.wikipedia.org/wiki/Liste_des_torpilleurs_num%C3%A9rot%C3%A9s_de_la_Marine_fran%C3%A7aise

-1875-Torpilleur N°1-38x4.2x1.25-2.6-101t-800shp-14.37kts-1TT356mm-fore+1TTaft

-1875-Torpilleur Thornycroft-n°9-27t-26.4x2.93x0.98x300shp-18kts-1TT fore

-1876-Torpilleur de 27m-Normand-N°41-27x3.55x0.54-30.5t-320-500shp-18kts-1TT
----------------------------------------------
& latter, in SS3 projects

-1877-80t-38x4.2x1.31-2x37+2ttx356-125nm-10kts-1050shp-18.7kts

-1878-80t-38x4.2x1.31-2x37+2ttx356-125nm-10kts-1120shp-19kts.


Jef

[miketr]

About what I expected so its clear that as long as we are willing to accept very defective ships in terms of sea-keeping and range that we can use SS3 to create torpedo boats.

Michael

[Jefgte]

About what I expected so its clear that as long as we are willing to accept very defective ships in terms of sea-keeping and range that we can use SS3 to create torpedo boats.

That's why France built strictly  N°1-9-41 as protos
These protos w'll not be use for war operations.

Jef

[snip]

Well, the name is befitting given just how bad of a time her crew is going to have, they may wish they were.

P'yanitsa, Republika Novaya Rossiya Torpedo Boat laid down 1880

Displacement:
   64 t light; 66 t standard; 70 t normal; 73 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (112.00 ft / 110.00 ft) x 10.00 ft x (4.00 / 4.15 ft)
   (34.14 m / 33.53 m) x 3.05 m  x (1.22 / 1.27 m)

Armament:
      1 - 0.75" / 19.1 mm 40.0 cal gun - 0.25lbs / 0.11kg shells, 50 per gun
     Breech loading gun in deck mount, 1880 Model
     1 x Single mount on centreline, aft deck aft
      Weight of broadside 0 lbs / 0 kg
      Main Torpedoes
      2 - 15.0" / 381 mm, 12.00 ft / 3.66 m torpedoes - 0.602 t each, 1.204 t total
   In 2 sets of deck mounted carriage/fixed tubes

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 1,400 ihp / 1,044 Kw = 20.04 kts
   Range 40nm at 20.00 kts
   Bunker at max displacement = 8 tons (100% coal)
     Caution: Delicate, lightweight machinery

Complement:
   11 - 15

Cost:
   £0.009 million / $0.034 million

Distribution of weights at normal displacement:
   Armament: 2 tons, 2.2 %
      - Guns: 0 tons, 0.1 %
      - Weapons: 2 tons, 2.2 %
   Machinery: 45 tons, 64.4 %
   Hull, fittings & equipment: 18 tons, 25.4 %
   Fuel, ammunition & stores: 6 tons, 8.0 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     10 lbs / 4 Kg = 53.9 x 0.8 " / 19 mm shells or 0.1 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 0.2 ft / 0.1 m
   Roll period: 9.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 49 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 0.56

Hull form characteristics:
   Hull has a flush deck,
     a ram bow and a cruiser stern
   Block coefficient (normal/deep): 0.557 / 0.562
   Length to Beam Ratio: 11.00 : 1
   'Natural speed' for length: 10.49 kts
   Power going to wave formation at top speed: 72 %
   Trim (Max stability = 0, Max steadiness = 100): 85
   Bow angle (Positive = bow angles forward): -45.00 degrees
   Stern overhang: -5.00 ft / -1.52 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  3.00 ft / 0.91 m,  6.00 ft / 1.83 m
      - Forward deck:   30.00 %,  6.00 ft / 1.83 m,  4.00 ft / 1.22 m
      - Aft deck:   35.00 %,  4.00 ft / 1.22 m,  4.00 ft / 1.22 m
      - Quarter deck:   15.00 %,  4.00 ft / 1.22 m,  4.00 ft / 1.22 m
      - Average freeboard:      4.46 ft / 1.36 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 207.9 %
      - Above water (accommodation/working, high = better): 57.4 %
   Waterplane Area: 773 Square feet or 72 Square metres
   Displacement factor (Displacement / loading): 12 %
   Structure weight / hull surface area: 12 lbs/sq ft or 56 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.42
      - Overall: 0.56
   Caution: Hull subject to strain in open-sea
   Extremely poor machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Caution: Lacks seaworthiness - very limited seakeeping ability