WesWorld

Minesweepers and mine warfare vessels

MS-26 class, 16 ships, MS 26-41
MS-9 class,16 ships, MS 9-12, MS 14-25
MS-1 class, 8 ships, MS 1-8

MS-26 class

16 ships



Atlantean Mine warfare vessel laid down 1929

Displacement:
674 t light; 694 t standard; 782 t normal; 853 t full load

Dimensions: Length overall / water x beam x draught
229.73 ft / 227.00 ft x 26.00 ft x 8.00 ft (normal load)
70.02 m / 69.19 m x 7.92 m x 2.44 m

Armament:
2 - 3.00" / 76.2 mm guns (1x2 guns), 13.50lbs / 6.12kg shells, 1929 Model
Dual purpose guns in deck mount
on centreline forward
2 - 1.57" / 39.9 mm guns (1x2 guns), 1.93lbs / 0.88kg shells, 1929 Model
Anti-aircraft guns in deck mount
on centreline aft
2 - 0.79" / 20 mm guns (1x2 guns), 0.25lbs / 0.11kg shells, 1929 Model
Anti-aircraft guns in deck mount
on centreline forward, all raised guns - superfiring
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1929 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 32 lbs / 14 kg
Shells per gun, main battery: 220

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -
2nd: 0.79" / 20 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 1,912 shp / 1,426 Kw = 16.50 kts
Range 5,000nm at 12.00 kts
Bunker at max displacement = 159 tons

Complement:
73 - 96

Cost:
£0.141 million / $0.562 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.5 %
Armour: 5 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 59 tons, 7.5 %
Hull, fittings & equipment: 427 tons, 54.6 %
Fuel, ammunition & stores: 108 tons, 13.8 %
Miscellaneous weights: 180 tons, 23.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,663 lbs / 754 Kg = 123.2 x 3.0 " / 76 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 0.7 ft / 0.2 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.06
Seaboat quality (Average = 1.00): 1.34

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.580
Length to Beam Ratio: 8.73 : 1
'Natural speed' for length: 15.07 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 52
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 10.20 ft / 3.11 m
- Forecastle (20 %): 10.00 ft / 3.05 m
- Mid (50 %): 8.00 ft / 2.44 m
- Quarterdeck (15 %): 6.00 ft / 1.83 m (8.00 ft / 2.44 m before break)
- Stern: 6.00 ft / 1.83 m
- Average freeboard: 8.42 ft / 2.57 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 54.6 %
- Above water (accommodation/working, high = better): 93.5 %
Waterplane Area: 4,237 Square feet or 394 Square metres
Displacement factor (Displacement / loading): 235 %
Structure weight / hull surface area: 66 lbs/sq ft or 321 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.82
- Longitudinal: 2.43
- Overall: 1.87
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

MS-9 class minesweepers, 16 ships

Atlantean Minesweeper laid down 1922

Displacement:
598 t light; 614 t standard; 694 t normal; 758 t full load

Dimensions: Length overall / water x beam x draught
205.89 ft / 205.00 ft x 24.00 ft x 8.00 ft (normal load)
62.76 m / 62.48 m x 7.32 m x 2.44 m

Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1922 Model
Breech loading gun in deck mount
on centreline forward
2 - 1.57" / 39.9 mm guns in single mounts, 1.93lbs / 0.88kg shells, 1922 Model
Breech loading guns in deck mounts
on side, all amidships
4 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1922 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 19 lbs / 9 kg
Shells per gun, main battery: 150

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 2,648 shp / 1,975 Kw = 18.00 kts
Range 7,000nm at 10.00 kts
Bunker at max displacement = 143 tons

Complement:
66 - 87

Cost:
£0.097 million / $0.388 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.3 %
Machinery: 90 tons, 12.9 %
Hull, fittings & equipment: 456 tons, 65.7 %
Fuel, ammunition & stores: 95 tons, 13.8 %
Miscellaneous weights: 50 tons, 7.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,487 lbs / 674 Kg = 110.1 x 3.0 " / 76 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.617
Length to Beam Ratio: 8.54 : 1
'Natural speed' for length: 14.32 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 59
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: 10.20 ft / 3.11 m
- Forecastle (20 %): 10.00 ft / 3.05 m
- Mid (50 %): 8.00 ft / 2.44 m
- Quarterdeck (15 %): 6.00 ft / 1.83 m (8.00 ft / 2.44 m before break)
- Stern: 6.00 ft / 1.83 m
- Average freeboard: 8.42 ft / 2.57 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 53.8 %
- Above water (accommodation/working, high = better): 89.3 %
Waterplane Area: 3,656 Square feet or 340 Square metres
Displacement factor (Displacement / loading): 279 %
Structure weight / hull surface area: 78 lbs/sq ft or 381 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.24
- Longitudinal: 3.78
- Overall: 2.36
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped

MS-1 class minesweepers, 8 ships

MS-1 class, Atlantis Minesweeper laid down 1918

Displacement:
629 t light; 645 t standard; 726 t normal; 791 t full load

Dimensions: Length overall / water x beam x draught
212.80 ft / 212.00 ft x 26.00 ft x 7.50 ft (normal load)
64.86 m / 64.62 m x 7.92 m x 2.29 m

Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1918 Model
Breech loading gun in deck mount
on centreline forward
1 - 1.57" / 39.9 mm guns in single mounts, 1.93lbs / 0.88kg shells, 1918 Model
Breech loading gun in deck mount
on side amidships
4 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1918 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 150

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 1,322 ihp / 986 Kw = 15.00 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 146 tons

Complement:
69 - 90

Cost:
£0.070 million / $0.278 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.3 %
Machinery: 78 tons, 10.7 %
Hull, fittings & equipment: 499 tons, 68.7 %
Fuel, ammunition & stores: 97 tons, 13.4 %
Miscellaneous weights: 50 tons, 6.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,865 lbs / 846 Kg = 138.2 x 3.0 " / 76 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 0.9 ft / 0.3 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 1.32

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.615
Length to Beam Ratio: 8.15 : 1
'Natural speed' for length: 14.56 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 53
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: 9.20 ft / 2.80 m
- Forecastle (20 %): 9.00 ft / 2.74 m
- Mid (50 %): 7.00 ft / 2.13 m
- Quarterdeck (15 %): 6.00 ft / 1.83 m (7.00 ft / 2.13 m before break)
- Stern: 6.00 ft / 1.83 m
- Average freeboard: 7.57 ft / 2.31 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 46.0 %
- Above water (accommodation/working, high = better): 84.2 %
Waterplane Area: 4,088 Square feet or 380 Square metres
Displacement factor (Displacement / loading): 325 %
Structure weight / hull surface area: 83 lbs/sq ft or 407 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.46
- Longitudinal: 2.95
- Overall: 2.51
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

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