Mine Warfare Vessels

[The Rock Doctor]

But where is the earth-shattering kaboom?

Minesweepers (singular Trałowiec) are not named, but designated "R-_"

Minelayers (singular Stawiacz min) are named.

[The Rock Doctor]

Type 1913 Minesweeper

Their range is high for transit purposes, but they're expected to be largely coastal critters and probably wouldn't have nearly as much coal aboard in normal operating circumstances.

At the moment, the type receives numbers rather than names.

TL-1 through -8, laid down 1913
TL-9 through -14, laid down 1914
TL-15 through -18, laid down 1915


AS REFURBISHED, 1931

Enter ship name, Enter country Enter ship type laid down 1913, refit 1931

Displacement:
   422 t light; 443 t standard; 526 t normal; 592 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (170.29 ft / 163.71 ft) x 31.17 ft x (6.56 / 7.21 ft)
   (51.91 m / 49.90 m) x 9.50 m  x (2.00 / 2.20 m)

Armament:
      1 - 3.94" / 100 mm 45.0 cal gun - 30.77lbs / 13.96kg shells, 150 per gun
     Breech loading gun in deck mount, 1913 Model
     1 x Single mount on centreline, forward deck centre
      1 raised mount
      2 - 1.97" / 50.0 mm 60.0 cal guns - 4.18lbs / 1.89kg shells, 1,500 per gun
     Anti-air guns in deck mount, 1913 Model
     1 x Twin mount on centreline, aft deck forward
      1 raised mount
      4 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1913 Model
     2 x Twin mounts on sides, forward deck aft
      2 raised mounts
      Weight of broadside 40 lbs / 18 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.79" / 20 mm            -
   2nd:   0.59" / 15 mm         -               -
   3rd:   0.59" / 15 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 1,005 ihp / 750 Kw = 14.23 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 149 tons (100% coal)

Complement:
   54 - 71

Cost:
   £0.029 million / $0.115 million

Distribution of weights at normal displacement:
   Armament: 7 tons, 1.4%
      - Guns: 7 tons, 1.4%
   Armour: 7 tons, 1.3%
      - Armament: 7 tons, 1.3%
   Machinery: 66 tons, 12.6%
   Hull, fittings & equipment: 234 tons, 44.6%
   Fuel, ammunition & stores: 104 tons, 19.8%
   Miscellaneous weights: 107 tons, 20.3%
      - Hull below water: 15 tons
      - On freeboard deck: 82 tons
      - Above deck: 10 tons

Fittings:
-15t:  Enhanced hydrophone package (BW)
-25 t:  Minesweeping kit (FD)
-17 t:  ASW gear (2 DCT-Y and 15 t of latest DCs) (FD)
-40 t:  Mine capacity (FD)
-1 t:  1924 fire control (AD)
-2 t:  Spotlight(s) (AD)
-7 t:  Weight reserve (AD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,972 lbs / 895 Kg = 64.6 x 3.9 " / 100 mm shells or 1.2 torpedoes
   Stability (Unstable if below 1.00): 1.41
   Metacentric height 1.6 ft / 0.5 m
   Roll period: 10.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.563
   Length to Beam Ratio: 5.25 : 1
   'Natural speed' for length: 12.80 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   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%,  18.70 ft / 5.70 m,  15.75 ft / 4.80 m
      - Forward deck:   30.00%,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Aft deck:   35.00%,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Quarter deck:   15.00%,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Average freeboard:      12.05 ft / 3.67 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 51.1%
      - Above water (accommodation/working, high = better): 144.6%
   Waterplane Area: 3,561 Square feet or 331 Square metres
   Displacement factor (Displacement / loading): 196%
   Structure weight / hull surface area: 42 lbs/sq ft or 205 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 6.00
      - Overall: 1.17
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

AS BUILT

Enter ship name, Enter country Enter ship type laid down 1913

Displacement:
   429 t light; 443 t standard; 526 t normal; 592 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (170.29 ft / 163.71 ft) x 31.17 ft x (6.56 / 7.21 ft)
   (51.91 m / 49.90 m) x 9.50 m  x (2.00 / 2.20 m)

Armament:
      1 - 3.94" / 100 mm 45.0 cal gun - 30.77lbs / 13.96kg shells, 150 per gun
     Breech loading gun in deck mount, 1913 Model
     1 x Single mount on centreline, forward deck centre
      1 raised mount
      1 - 1.97" / 50.0 mm 45.0 cal gun - 3.85lbs / 1.74kg shells, 250 per gun
     Quick firing gun in deck mount, 1913 Model
     1 x Single mount on centreline, aft deck forward
      1 raised mount
      2 - 0.39" / 10.0 mm 45.0 cal guns - 0.03lbs / 0.01kg shells, 15,000 per gun
     Machine guns in deck mounts, 1913 Model
     2 x Single mounts on sides, forward deck aft
      2 raised mounts
      Weight of broadside 35 lbs / 16 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.79" / 20 mm            -
   2nd:   0.39" / 10 mm   0.39" / 10 mm            -
   3rd:   0.20" / 5 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 1,005 ihp / 750 Kw = 14.23 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 149 tons (100% coal)

Complement:
   54 - 71

Cost:
   £0.028 million / $0.114 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 1.1 %
      - Guns: 6 tons, 1.1 %
   Armour: 8 tons, 1.5 %
      - Armament: 8 tons, 1.5 %
   Machinery: 66 tons, 12.6 %
   Hull, fittings & equipment: 199 tons, 37.9 %
   Fuel, ammunition & stores: 97 tons, 18.4 %
   Miscellaneous weights: 150 tons, 28.5 %
      - On freeboard deck: 140 tons
      - Above deck: 10 tons

Fittings:
-100 t:  Minesweeping gear
-40 t:  Fitted for but not necessarily within 40 mines for laying

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,164 lbs / 982 Kg = 70.9 x 3.9 " / 100 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.36
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 10.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.563
   Length to Beam Ratio: 5.25 : 1
   'Natural speed' for length: 12.80 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   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 %,  18.70 ft / 5.70 m,  15.75 ft / 4.80 m
      - Forward deck:   30.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Aft deck:   35.00 %,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Quarter deck:   15.00 %,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Average freeboard:      12.05 ft / 3.67 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 45.8 %
      - Above water (accommodation/working, high = better): 144.6 %
   Waterplane Area: 3,561 Square feet or 331 Square metres
   Displacement factor (Displacement / loading): 171 %
   Structure weight / hull surface area: 36 lbs/sq ft or 174 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.83
      - Longitudinal: 5.10
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

Huth Class Minelayer

This small, slow minelayer has a single wee gun for self-defence against canoes, but plenty of mines for defensive fields and some gear to haul them back in again if necessary.  They're built cheap and expendable, but with the legs to cross the Atlantic if absolutely necessary.

Huth, laid down 1915
Wenzel, laid down 1915
Dannemora, laid down 1916
Finstergrund, laid down 1916

Enter ship name, Enter country Enter ship type laid down 1915

Displacement:
   762 t light; 781 t standard; 885 t normal; 969 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (223.58 ft / 213.25 ft) x 32.81 ft x (8.86 / 9.48 ft)
   (68.15 m / 65.00 m) x 10.00 m  x (2.70 / 2.89 m)

Armament:
      1 - 2.95" / 75.0 mm 45.0 cal gun - 12.98lbs / 5.89kg shells, 150 per gun
     Quick firing gun in deck mount, 1915 Model
     1 x Single mount on centreline, forward deck centre
      1 raised mount
      3 - 0.39" / 10.0 mm 45.0 cal guns - 0.03lbs / 0.01kg shells, 15,000 per gun
     Machine guns in deck mounts, 1915 Model
     2 x Single mounts on sides amidships
      2 raised mounts
     1 x Single mount on centreline, aft deck centre
      1 raised mount
      Weight of broadside 13 lbs / 6 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.39" / 10 mm            -
   3rd:   0.39" / 10 mm         -               -

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 2,413 ihp / 1,800 Kw = 17.06 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 187 tons (100% coal)

Complement:
   80 - 105

Cost:
   £0.072 million / $0.288 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 0.3 %
      - Guns: 3 tons, 0.3 %
   Armour: 5 tons, 0.6 %
      - Armament: 5 tons, 0.6 %
   Machinery: 158 tons, 17.9 %
   Hull, fittings & equipment: 364 tons, 41.1 %
   Fuel, ammunition & stores: 124 tons, 14.0 %
   Miscellaneous weights: 232 tons, 26.2 %
      - On freeboard deck: 232 tons

Fittings:
-50 t:  Sweeping kit
-170 t:  Mines
-12 t:  Weight Reserve

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,770 lbs / 1,256 Kg = 215.2 x 3.0 " / 75 mm shells or 1.2 torpedoes
   Stability (Unstable if below 1.00): 1.18
   Metacentric height 1.3 ft / 0.4 m
   Roll period: 12.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.03
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.500 / 0.511
   Length to Beam Ratio: 6.50 : 1
   'Natural speed' for length: 14.60 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 35
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  21.33 ft / 6.50 m,  16.40 ft / 5.00 m
      - Forward deck:   30.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Aft deck:   30.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Quarter deck:   20.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Average freeboard:      15.22 ft / 4.64 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 60.0 %
      - Above water (accommodation/working, high = better): 182.1 %
   Waterplane Area: 4,662 Square feet or 433 Square metres
   Displacement factor (Displacement / loading): 158 %
   Structure weight / hull surface area: 40 lbs/sq ft or 196 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.80
      - Longitudinal: 6.94
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

TL-19 Class Minesweeper

Hey, it's an armored minesweeper, purpose-built to sweep under fire and attack from light enemy forces.  Does it make more sense than using destroyers for the role?  I dunno, but they might live a little bit longer.

TL-19, laid down 1916
TL-20, laid down 1916
TL-21, laid down 1917
TL-22, laid down 1917

Enter ship name, Enter country Enter ship type laid down 1916

Displacement:
   1,059 t light; 1,094 t standard; 1,241 t normal; 1,359 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (236.41 ft / 229.66 ft) x 31.17 ft x (12.14 / 13.01 ft)
   (72.06 m / 70.00 m) x 9.50 m  x (3.70 / 3.96 m)

Armament:
      4 - 3.94" / 100 mm 45.0 cal guns - 30.78lbs / 13.96kg shells, 150 per gun
     Quick firing guns in deck mounts, 1916 Model
     2 x Single mounts on centreline, forward deck forward
      1 raised mount - superfiring
     2 x Single mounts on centreline, forward deck aft
      Weight of broadside 123 lbs / 56 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.97" / 50 mm   229.66 ft / 70.00 m   11.48 ft / 3.50 m
     Main Belt covers 154 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.39" / 10 mm            -

   - Protected deck - single deck:
   For and Aft decks: 0.59" / 15 mm
   Forecastle: 0.59" / 15 mm  Quarter deck: 0.59" / 15 mm

   - Conning towers: Forward 1.97" / 50 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 9,718 shp / 7,250 Kw = 23.03 kts
   Range 8,000nm at 10.00 kts
   Bunker at max displacement = 266 tons

Complement:
   103 - 135

Cost:
   £0.153 million / $0.613 million

Distribution of weights at normal displacement:
   Armament: 22 tons, 1.8 %
      - Guns: 22 tons, 1.8 %
   Armour: 260 tons, 21.0 %
      - Belts: 192 tons, 15.5 %
      - Armament: 11 tons, 0.9 %
      - Armour Deck: 53 tons, 4.2 %
      - Conning Tower: 5 tons, 0.4 %
   Machinery: 362 tons, 29.2 %
   Hull, fittings & equipment: 356 tons, 28.7 %
   Fuel, ammunition & stores: 183 tons, 14.7 %
   Miscellaneous weights: 58 tons, 4.7 %
      - On freeboard deck: 56 tons
      - Above deck: 2 tons

Fittings:
-50 t:  Sweeping kit
-2 t:  Fire control
-6 t:  Weight reserve


Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,483 lbs / 673 Kg = 48.6 x 3.9 " / 100 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 1.2 ft / 0.4 m
   Roll period: 11.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.17
   Seaboat quality  (Average = 1.00): 1.17

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.500 / 0.511
   Length to Beam Ratio: 7.37 : 1
   'Natural speed' for length: 15.15 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 60
   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 %,  19.69 ft / 6.00 m,  15.75 ft / 4.80 m
      - Forward deck:   40.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Aft deck:   20.00 %,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Quarter deck:   20.00 %,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Average freeboard:      12.91 ft / 3.94 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 100.0 %
      - Above water (accommodation/working, high = better): 115.7 %
   Waterplane Area: 4,769 Square feet or 443 Square metres
   Displacement factor (Displacement / loading): 113 %
   Structure weight / hull surface area: 41 lbs/sq ft or 198 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.76
      - Longitudinal: 3.82
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Adequate machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[The Rock Doctor]

TL-23 Class Minesweeper

A coastal minesweeper with some capability to lay defensive minefields or undertake local escort duties.  The use of coal as a fuel primarily reflects an interest in post-mine-hitting survivability, rather than logistical ease.

TL-23, laid down 1922
TL-24, laid down 1922
TL-25, laid down 1923
TL-26, laid down 1923
TL-27, laid down 1924
TL-28, laid down 1924
TL-29, laid down 1925
TL-30, laid down 1925

Enter ship name, Enter country Enter ship type laid down 1922

Displacement:
   349 t light; 360 t standard; 405 t normal; 441 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (163.52 ft / 156.82 ft) x 26.25 ft x (6.89 / 7.35 ft)
   (49.84 m / 47.80 m) x 8.00 m  x (2.10 / 2.24 m)

Armament:
      1 - 2.95" / 75.0 mm 45.0 cal gun - 12.98lbs / 5.89kg shells, 250 per gun
     Quick firing gun in deck mount, 1922 Model
     1 x Single mount on centreline, forward deck centre
      1 raised mount
      1 - 1.97" / 50.0 mm 45.0 cal gun - 3.86lbs / 1.75kg shells, 250 per gun
     Anti-air gun in deck mount, 1922 Model
     1 x Single mount on centreline, aft deck forward
      2 - 0.39" / 10.0 mm 45.0 cal guns - 0.02lbs / 0.01kg shells, 4,000 per gun
     Machine guns in deck mounts, 1922 Model
     2 x Single mounts on sides, forward deck aft
      2 raised mounts
      Weight of broadside 17 lbs / 8 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.12" / 3 mm            -
   2nd:   0.79" / 20 mm   0.12" / 3 mm            -

Machinery:
   Coal and oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 1,609 shp / 1,200 Kw = 16.78 kts
   Range 4,000nm at 10.00 kts
   Bunker at max displacement = 82 tons (90% coal)

Complement:
   44 - 58

Cost:
   £0.058 million / $0.234 million

Distribution of weights at normal displacement:
   Armament: 3 tons, 0.8 %
      - Guns: 3 tons, 0.8 %
   Armour: 2 tons, 0.5 %
      - Armament: 2 tons, 0.5 %
   Machinery: 59 tons, 14.7 %
   Hull, fittings & equipment: 175 tons, 43.3 %
   Fuel, ammunition & stores: 56 tons, 13.8 %
   Miscellaneous weights: 109 tons, 26.9 %
      - Hull below water: 25 tons
      - On freeboard deck: 82 tons
      - Above deck: 2 tons

Fittings:
-5 t:  Basic hydrophone package (BW)
-20 t:  Hull bracing (BW)
-25 t:  Sweeping gear (FD)
-40 t:  Mines (FD)
-10 t:  ASW munitions (FD) (2 x T-DCT, 40 x 195 kg DC)
-1 t:  1918 fire control, such as it is (AD)
-8 t:  Weight reserve

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,251 lbs / 567 Kg = 97.2 x 3.0 " / 75 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.32
   Metacentric height 1.1 ft / 0.3 m
   Roll period: 10.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.04
   Seaboat quality  (Average = 1.00): 1.96

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.500 / 0.510
   Length to Beam Ratio: 5.98 : 1
   'Natural speed' for length: 12.52 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 26
   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 %,  19.36 ft / 5.90 m,  16.40 ft / 5.00 m
      - Forward deck:   20.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Aft deck:   45.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Quarter deck:   15.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Average freeboard:      11.92 ft / 3.63 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 58.0 %
      - Above water (accommodation/working, high = better): 130.0 %
   Waterplane Area: 2,742 Square feet or 255 Square metres
   Displacement factor (Displacement / loading): 170 %
   Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 8.07
      - Overall: 1.10
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

Bochnia Class Fast Minelayer

The first use I've got for a 2,500 t destroyer hull is to make a fast minelayer out of it.  This would complement two existing minelayer-cruisers and continue my trend of focusing on specialized offensive minelayers rather than having large quantities of light forces with limited capabilities.

The torpedoes are defensive stand-off weapons, something to make a pursuer think twice about pursuing.

Bochnia, laid down 1927
Wieliczka, laid down 1927
Svornost, laid down 1928

Enter ship name, Enter country Enter ship type laid down 1927

Displacement:
   2,499 t light; 2,595 t standard; 3,034 t normal; 3,385 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (432.90 ft / 414.70 ft) x 38.71 ft x (15.75 / 16.98 ft)
   (131.95 m / 126.40 m) x 11.80 m  x (4.80 / 5.17 m)

Armament:
      6 - 3.94" / 100.0 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 300 per gun
     Quick firing guns in deck mounts, 1927 Model
     1 x 2-gun mount on centreline, forward deck centre
      1 raised mount
     2 x 2-gun mounts on centreline, aft evenly spread
      1 raised mount
      4 - 1.97" / 50.0 mm 45.0 cal guns - 3.85lbs / 1.75kg shells, 300 per gun
     Anti-air guns in deck mounts, 1927 Model
     4 x Single mounts on sides, evenly spread
      8 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1927 Model
     4 x Twin mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 201 lbs / 91 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.79" / 20 mm            -
   3rd:   0.79" / 20 mm   0.12" / 3 mm            -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 51,609 shp / 38,500 Kw = 33.09 kts
   Range 16,400nm at 10.00 kts
   Bunker at max displacement = 790 tons

Complement:
   203 - 265

Cost:
   £1.129 million / $4.516 million

Distribution of weights at normal displacement:
   Armament: 37 tons, 1.2 %
   Armour: 20 tons, 0.7 %
      - Armament: 20 tons, 0.7 %
   Machinery: 1,520 tons, 50.1 %
   Hull, fittings & equipment: 678 tons, 22.3 %
   Fuel, ammunition & stores: 535 tons, 17.6 %
   Miscellaneous weights: 244 tons, 8.0 %
      - Hull above water: 140 tons
      - On freeboard deck: 34 tons
      - Above deck: 70 tons

Fittings:
-4 t:  Fire control (AD)
-25 t:  Night-fighting doodads (AD)
-25 t:  L/R wireless (AD)
-18 t:  2x3 - 530mm torpedo carriages, no reloads (FD)
-32 t:  Weight reserve (AD/FD)
-140 t:  Mines, man (AW)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     815 lbs / 370 Kg = 26.7 x 3.9 " / 100 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.30
   Metacentric height 1.9 ft / 0.6 m
   Roll period: 11.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.13
   Seaboat quality  (Average = 1.00): 1.24

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.420 / 0.435
   Length to Beam Ratio: 10.71 : 1
   'Natural speed' for length: 20.36 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 56
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 9.84 ft / 3.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  22.97 ft / 7.00 m,  15.75 ft / 4.80 m
      - Forward deck:   30.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Aft deck:   35.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Quarter deck:   15.00 %,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Average freeboard:      16.33 ft / 4.98 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 170.9 %
      - Above water (accommodation/working, high = better): 147.9 %
   Waterplane Area: 10,009 Square feet or 930 Square metres
   Displacement factor (Displacement / loading): 84 %
   Structure weight / hull surface area: 35 lbs/sq ft or 171 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.49
      - Overall: 0.55
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

1080 nm @ 30 kts
1800 nm @ 25 kts (half-power)
3300 nm @ 20 kts
6800 nm @ 15 kts

[The Rock Doctor]

Type 1929 Minesweeper

This is a modest update of the previous 1923 iteration.  We're trying out diesel-electric machinery for responsive handling in minefields, and I've allocated more tonnage to both the primary sweeping and secondary ASW function.  The type also remains able to plop a small minefield of its own into the water if that proves useful.

AM-31, laid down 1929
AM-32, laid down 1929
AM-33, laid down 1930
AM-34, laid down 1930

Enter ship name, Enter country Enter ship type laid down 1928

Displacement:
   366 t light; 378 t standard; 398 t normal; 415 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (160.89 ft / 154.20 ft) x 26.25 ft x (6.89 / 7.10 ft)
   (49.04 m / 47.00 m) x 8.00 m  x (2.10 / 2.17 m)

Armament:
      1 - 2.95" / 75.0 mm 45.0 cal gun - 12.98lbs / 5.89kg shells, 250 per gun
     Quick firing gun in deck mount, 1928 Model
     1 x Single mount on centreline, forward deck centre
      1 raised mount
      1 - 1.97" / 50.0 mm 45.0 cal gun - 3.85lbs / 1.74kg shells, 250 per gun
     Anti-air gun in deck mount, 1928 Model
     1 x Single mount on centreline, aft deck forward
      1 raised mount
      4 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1928 Model
     2 x Twin mounts on sides, forward deck aft
      2 raised mounts
      Weight of broadside 17 lbs / 8 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.12" / 3 mm            -
   2nd:   0.79" / 20 mm   0.12" / 3 mm            -
   3rd:   0.59" / 15 mm         -               -

Machinery:
   Diesel Internal combustion generators,
   Electric motors, 2 shafts, 1,609 shp / 1,200 Kw = 16.78 kts
   Range 2,500nm at 10.00 kts
   Bunker at max displacement = 37 tons

Complement:
   43 - 57

Cost:
   £0.080 million / $0.319 million

Distribution of weights at normal displacement:
   Armament: 4 tons, 0.9 %
   Armour: 4 tons, 0.9 %
      - Armament: 4 tons, 0.9 %
   Machinery: 50 tons, 12.6 %
   Hull, fittings & equipment: 158 tons, 39.6 %
   Fuel, ammunition & stores: 32 tons, 8.1 %
   Miscellaneous weights: 151 tons, 37.9 %
      - Hull below water: 43 tons
      - On freeboard deck: 102 tons
      - Above deck: 6 tons

Fittings:
-15 t:  Enhanced hydrophone package (BW)
-28 t:  Diesel-electric drive (BW)
-50 t:  Sweeping gear (FD)
-40 t:  Mine capacity (FD)
-8 t:  ASW weaponry (FD) (2 x Y-DCT, 24 x 280 kg DC)
-1 t:  1918 fire control (AD)
-5 t:  Nightfighting doodads (AD)
-4 t:  Weight reserve

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,236 lbs / 561 Kg = 96.0 x 3.0 " / 75 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.28
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 10.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.05
   Seaboat quality  (Average = 1.00): 1.92

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.500 / 0.505
   Length to Beam Ratio: 5.88 : 1
   'Natural speed' for length: 12.42 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 26
   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 %,  19.36 ft / 5.90 m,  16.40 ft / 5.00 m
      - Forward deck:   20.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Aft deck:   45.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Quarter deck:   15.00 %,  8.53 ft / 2.60 m,  8.53 ft / 2.60 m
      - Average freeboard:      11.92 ft / 3.63 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 56.8 %
      - Above water (accommodation/working, high = better): 130.8 %
   Waterplane Area: 2,697 Square feet or 251 Square metres
   Displacement factor (Displacement / loading): 150 %
   Structure weight / hull surface area: 31 lbs/sq ft or 152 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.80
      - Longitudinal: 7.61
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is excellent
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Below water is 15 for EHP and 28 for diesel-electric

[The Rock Doctor]

Type 1931 Minesweeper

The 1931 minesweeper is much larger than the preceding type.

This is mostly because it's intended to operate in higher-threat environments such as the western Caribbean, where sweeping outside one's own ports doesn't ensure safety from torpedo-boat or aircraft attack.  Hence the armament is heavier, there's an armor belt, and a protective box over the vitals.

The ship is also fitted with a fairly comprehensive ASW kit, allowing it to take on proper coastal escort duties as required.

Obviously this would be built to military specifications.

AM-35, laid down 1931
AM-36, laid down 1931
AM-37, laid down 1932

Enter ship name, Enter country Enter ship type laid down 1931

Displacement:
   759 t light; 799 t standard; 858 t normal; 906 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (217.79 ft / 206.69 ft) x 29.53 ft x (9.84 / 10.25 ft)
   (66.38 m / 63.00 m) x 9.00 m  x (3.00 / 3.12 m)

Armament:
      1 - 3.94" / 100 mm 45.0 cal gun - 30.77lbs / 13.96kg shells, 400 per gun
     Dual purpose gun in deck mount, 1931 Model
     1 x Single mount on centreline amidships (forward deck)
      4 - 1.97" / 50.0 mm 60.0 cal guns - 4.18lbs / 1.89kg shells, 1,500 per gun
     Anti-air guns in deck mounts, 1931 Model
     2 x Twin mounts on centreline, evenly spread
      2 raised mounts
      4 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 5,000 per gun
     Machine guns in deck mounts, 1931 Model
     2 x Twin mounts on sides, forward deck centre
      2 double raised mounts
      Weight of broadside 48 lbs / 22 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.97" / 50 mm   134.35 ft / 40.95 m   11.81 ft / 3.60 m
   Ends:   0.98" / 25 mm     72.31 ft / 22.04 m   11.81 ft / 3.60 m
     Main Belt covers 100% of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.79" / 20 mm   0.59" / 15 mm            -
   2nd:   0.59" / 15 mm         -               -
   3rd:   0.59" / 15 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 0.98" / 25 mm
   Forecastle: 0.00" / 0 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 1.97" / 50 mm, Aft 0.00" / 0 mm

Machinery:
   Diesel Internal combustion generators,  plus diesel motors,
   Electric motors, 2 shafts, 3,352 shp / 2,500 Kw = 18.60 kts
   Range 5,000nm at 10.00 kts
   Bunker at max displacement = 107 tons

Complement:
   79 - 103

Cost:
   £0.190 million / $0.760 million

Distribution of weights at normal displacement:
   Armament: 10 tons, 1.2%
      - Guns: 10 tons, 1.2%
   Armour: 243 tons, 28.3%
      - Belts: 165 tons, 19.2%
      - Armament: 6 tons, 0.7%
      - Armour Deck: 68 tons, 7.9%
      - Conning Tower: 4 tons, 0.4%
   Machinery: 100 tons, 11.7%
   Hull, fittings & equipment: 211 tons, 24.6%
   Fuel, ammunition & stores: 99 tons, 11.5%
   Miscellaneous weights: 195 tons, 22.7%
      - Hull below water: 80 tons
      - On freeboard deck: 105 tons
      - Above deck: 10 tons

Fittings:
-1 t:  Fire control (AD)
-2 t:  Nightfighting doodads (AD)
-25 t:  Minesweeping gear (FD)
-12 t:  2x DCT-Y and 10t in latest model depth charges
-60 t:  60 mines
-55 t:  D-E machinery (BW)
-25 t:  Sonar and enhanced hydrophone package (BW)
-7+8 t:  Weight reserve (AD/FD)

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,664 lbs / 755 Kg = 54.5 x 3.9 " / 100 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 1.2 ft / 0.4 m
   Roll period: 11.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.09
   Seaboat quality  (Average = 1.00): 1.68

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.500 / 0.507
   Length to Beam Ratio: 7.00 : 1
   'Natural speed' for length: 14.38 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 42
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 3.94 ft / 1.20 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00%,  19.69 ft / 6.00 m,  15.75 ft / 4.80 m
      - Forward deck:   30.00%,  15.75 ft / 4.80 m,  15.75 ft / 4.80 m
      - Aft deck:   35.00%,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Quarter deck:   15.00%,  7.87 ft / 2.40 m,  7.87 ft / 2.40 m
      - Average freeboard:      12.13 ft / 3.70 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 54.8%
      - Above water (accommodation/working, high = better): 112.8%
   Waterplane Area: 4,066 Square feet or 378 Square metres
   Displacement factor (Displacement / loading): 129%
   Structure weight / hull surface area: 29 lbs/sq ft or 142 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.64
      - Longitudinal: 2.79
      - Overall: 0.75
   Caution: Hull subject to strain in open-sea
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather