Przebudowa torpedowców na trałowce

Jak już pisałem w komentarzu do poprzedniego posta, przemyślałem sprawę i uznałem, że faktycznie warto na torpedowcach przebudowanych na trałowce zdemontować wyrzutnie torped, a także zamontować km-y do rozstrzeliwania min (no i oczywiście trały). Dodatkowo, postanowiłem działka 47 mm wymienić na nowsze Hotchkissy 57 mm model 1904, jako że okręty te mają w razie konieczności pełnić też funkcję dozorowców.  Te nowe 6-funtówki to zawsze jakiś konkretniejszy kaliber niż dotychczasowe 3-funtówki. Przymierzałem się też do dział 75 mm, ale niestety – są za ciężkie. Te torpedowce to jednak delikatne i kruche jednostki i wg springsharpa nie uniosą takich dział.

 Poniżej „hurtem” przedstawiam wszystkie torpedowce po przebudowie na trałowce, wraz z sylwetkami oraz raportami springsharpa. Oczywiście w mocy pozostają wszystkie wcześniej podawane informacje o wymianie kotłów na tych jednostkach. Maszyny parowe pozostały wprawdzie stare, ale zostały poddane remontom celem wydłużenia ich żywotności.

 Tołpyga, polish minesweeper laid down 1885, rebuilt 1911

Displacement:
    132 t light; 136 t standard; 148 t normal; 158 t full load

Dimensions: Length overall / water x beam x draught
    144,19 ft / 144,19 ft x 16,27 ft x 4,66 ft (normal load)
    43,95 m / 43,95 m x 4,96 m  x 1,42 m

Armament:
      1 - 2,24" / 57,0 mm guns in single mounts, 5,65lbs / 2,56kg shells, 1904 Model
      Quick firing gun in deck mount
      on centreline forward
      1 - 0,30" / 7,6 mm guns in single mounts, 0,01lbs / 0,00kg shells, 1908 Model
      Machine gun in deck mount
      on centreline aft
    Weight of broadside 6 lbs / 3 kg
    Shells per gun, main battery: 250

Machinery:
    Coal fired boilers, complex reciprocating steam engines,
    Direct drive, 1 shaft, 2 831 ihp / 2 112 Kw = 22,20 kts
    Range 480nm at 12,00 kts
    Bunker at max displacement = 22 tons (100% coal)
      Caution: Delicate, lightweight machinery

Complement:
    20 - 27

Cost:
    £0,018 million / $0,073 million

Distribution of weights at normal displacement:
    Armament: 1 tons, 0,5%
    Machinery: 94 tons, 63,3%
    Hull, fittings & equipment: 37 tons, 25,2%
    Fuel, ammunition & stores: 16 tons, 11,0%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      30 lbs / 13 Kg = 5,7 x 2,2 " / 57 mm shells or 0,1 torpedoes
    Stability (Unstable if below 1.00): 1,85
    Metacentric height 0,9 ft / 0,3 m
    Roll period: 7,3 seconds
    Steadiness    - As gun platform (Average = 50 %): 31 %
            - Recoil effect (Restricted arc if above 1.00): 0,02
    Seaboat quality  (Average = 1.00): 0,38

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,474
    Length to Beam Ratio: 8,86 : 1
    'Natural speed' for length: 12,01 kts
    Power going to wave formation at top speed: 71 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): -18,00 degrees
    Stern overhang: 0,00 ft / 0,00 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        7,51 ft / 2,29 m
       - Forecastle (20%):    6,50 ft / 1,98 m
       - Mid (50%):        6,00 ft / 1,83 m
       - Quarterdeck (15%):    5,48 ft / 1,67 m
       - Stern:        5,48 ft / 1,67 m
       - Average freeboard:    6,09 ft / 1,86 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 208,0%
        - Above water (accommodation/working, high = better): 83,2%
    Waterplane Area: 1 461 Square feet or 136 Square metres
    Displacement factor (Displacement / loading): 13%
    Structure weight / hull surface area: 15 lbs/sq ft or 72 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,47
        - Longitudinal: 1,15
        - Overall: 0,52
    Caution: Hull subject to strain in open-sea
    Hull space for machinery, storage, compartmentation is extremely poor
    Room for accommodation and workspaces is cramped
    Caution: Lacks seaworthiness - very limited seakeeping ability


Tołpyga (1885, rebuilt 1911)
Kalmar (1885, rebuilt 1911)
Foka (1886, rebuilt 1911)
Uchatka (1886, rebuilt 1911)
Morświn (1886, rebuilt 1911)

Orzeł, polish minesweeper laid down 1886, rebuilt 1912

Displacement:
    192 t light; 198 t standard; 215 t normal; 229 t full load

Dimensions: Length overall / water x beam x draught
    158,56 ft / 158,56 ft x 17,95 ft x 5,84 ft (normal load)
    48,33 m / 48,33 m x 5,47 m  x 1,78 m

Armament:
      2 - 2,24" / 57,0 mm guns in single mounts, 5,65lbs / 2,56kg shells, 1904 Model
      Quick firing guns in deck mounts
      on centreline ends, evenly spread
      1 - 0,30" / 7,6 mm guns in single mounts, 0,01lbs / 0,00kg shells, 1908 Model
      Machine gun in deck mount
      on centreline amidships
    Weight of broadside 11 lbs / 5 kg
    Shells per gun, main battery: 250

Machinery:
    Coal fired boilers, complex reciprocating steam engines,
    Direct drive, 1 shaft, 4 904 ihp / 3 658 Kw = 24,30 kts
    Range 900nm at 10,00 kts
    Bunker at max displacement = 32 tons (100% coal)
      Caution: Delicate, lightweight machinery

Complement:
    27 - 36

Cost:
    £0,027 million / $0,109 million

Distribution of weights at normal displacement:
    Armament: 1 tons, 0,7%
    Machinery: 139 tons, 64,5%
    Hull, fittings & equipment: 51 tons, 23,9%
    Fuel, ammunition & stores: 23 tons, 10,9%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      39 lbs / 18 Kg = 7,3 x 2,2 " / 57 mm shells or 0,1 torpedoes
    Stability (Unstable if below 1.00): 1,92
    Metacentric height 1,1 ft / 0,3 m
    Roll period: 7,3 seconds
    Steadiness    - As gun platform (Average = 50 %): 23 %
            - Recoil effect (Restricted arc if above 1.00): 0,03
    Seaboat quality  (Average = 1.00): 0,22

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,453
    Length to Beam Ratio: 8,84 : 1
    'Natural speed' for length: 12,59 kts
    Power going to wave formation at top speed: 72 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): -8,00 degrees
    Stern overhang: 0,00 ft / 0,00 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        6,99 ft / 2,13 m
       - Forecastle (20%):    6,50 ft / 1,98 m
       - Mid (50%):        6,00 ft / 1,83 m
       - Quarterdeck (15%):    5,48 ft / 1,67 m
       - Stern:        5,48 ft / 1,67 m
       - Average freeboard:    6,04 ft / 1,84 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 213,4%
        - Above water (accommodation/working, high = better): 73,1%
    Waterplane Area: 1 735 Square feet or 161 Square metres
    Displacement factor (Displacement / loading): 11%
    Structure weight / hull surface area: 18 lbs/sq ft or 86 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,50
        - Longitudinal: 0,99
        - Overall: 0,53
    Hull space for machinery, storage, compartmentation is extremely poor
    Room for accommodation and workspaces is cramped
    Ship has quick, lively roll, not a steady gun platform
    Caution: Lacks seaworthiness - very limited seakeeping ability

Orzeł (1886, rebuilt 1912)
Kobuz (1887, rebuilt 1912)
Sokół (1887, rebuilt 1912)

Zawzięty, polish minesweeper laid down 1889, rebuilt 1912

Displacement:
    172 t light; 177 t standard; 188 t normal; 197 t full load

Dimensions: Length overall / water x beam x draught
    153,58 ft / 153,58 ft x 16,83 ft x 5,31 ft (normal load)
    46,81 m / 46,81 m x 5,13 m  x 1,62 m

Armament:
      2 - 2,24" / 57,0 mm guns in single mounts, 5,65lbs / 2,56kg shells, 1904 Model
      Quick firing guns in deck mounts
      on centreline ends, evenly spread
      1 - 0,30" / 7,6 mm guns in single mounts, 0,01lbs / 0,00kg shells, 1908 Model
      Machine gun in deck mount
      on centreline forward, 1 raised gun
    Weight of broadside 11 lbs / 5 kg
    Shells per gun, main battery: 250

Machinery:
    Coal fired boilers, complex reciprocating steam engines,
    Direct drive, 1 shaft, 5 123 ihp / 3 821 Kw = 25,00 kts
    Range 400nm at 12,00 kts
    Bunker at max displacement = 19 tons (100% coal)
      Caution: Delicate, lightweight machinery

Complement:
    25 - 33

Cost:
    £0,025 million / $0,098 million

Distribution of weights at normal displacement:
    Armament: 1 tons, 0,8%
    Machinery: 124 tons, 65,7%
    Hull, fittings & equipment: 47 tons, 25,0%
    Fuel, ammunition & stores: 16 tons, 8,6%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      35 lbs / 16 Kg = 6,2 x 2,2 " / 57 mm shells or 0,1 torpedoes
    Stability (Unstable if below 1.00): 1,78
    Metacentric height 0,9 ft / 0,3 m
    Roll period: 7,5 seconds
    Steadiness    - As gun platform (Average = 50 %): 26 %
            - Recoil effect (Restricted arc if above 1.00): 0,04
    Seaboat quality  (Average = 1.00): 0,28

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0,479
    Length to Beam Ratio: 9,12 : 1
    'Natural speed' for length: 12,39 kts
    Power going to wave formation at top speed: 75 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): -23,00 degrees
    Stern overhang: 0,00 ft / 0,00 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        8,01 ft / 2,44 m
       - Forecastle (20%):    7,51 ft / 2,29 m
       - Mid (50%):        6,50 ft / 1,98 m
       - Quarterdeck (15%):    6,00 ft / 1,83 m
       - Stern:        6,00 ft / 1,83 m
       - Average freeboard:    6,73 ft / 2,05 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 217,9%
        - Above water (accommodation/working, high = better): 81,4%
    Waterplane Area: 1 618 Square feet or 150 Square metres
    Displacement factor (Displacement / loading): 10%
    Structure weight / hull surface area: 16 lbs/sq ft or 76 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,45
        - Longitudinal: 1,44
        - Overall: 0,51
    Hull space for machinery, storage, compartmentation is extremely poor
    Room for accommodation and workspaces is cramped
    Ship has quick, lively roll, not a steady gun platform
    Caution: Lacks seaworthiness - very limited seakeeping ability

Zawzięty (1889, rebuilt 1912)
Nieuchwytny (1889, rebuilt 1912)
Odważny (1889, rebuilt 1913)
Śmiały (1889, rebuilt 1913)
Nieugięty (1890, rebuilt 1913)
Wytrwały (1890, rebuilt 1913)
Groźny (1890, rebuilt 1913)
Szybki (1890, rebuilt 1913)