MS-14 Coastal Minesweeper

[Jeremy]

MS-14, Laksmanavati Coastal Minesweeper, laid down 1924

The MS-14 class was intended to replace the MS-8s in coastal waters, freeing the larger ships for fleet operations. The MS-14s could still function as sub chasers and light minelayers along the coast, although their payloads were much smaller. Ten boats were constructed (MS-14 through MS-23).

Displacement:
        251 t light; 262 t standard; 284 t normal; 301 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
        (121.89 ft / 114.83 ft) x 21.98 ft x (7.87 / 8.24 ft)
        (37.15 m / 35.00 m) x 6.70 m  x (2.40 / 2.51 m)

Armament:
      1 - 4.33" / 110 mm 45.0 cal gun - 40.96lbs / 18.58kg shells, 170 per gun
          Quick firing gun in deck mount, 1924 Model
          1 x Single mount on centreline, forward deck forward
      2 - 1.57" / 40.0 mm 39.0 cal guns - 1.85lbs / 0.84kg shells, 900 per gun
          Anti-air guns in deck mounts, 1924 Model
          2 x Single mounts on sides, forward deck centre
      4 - 0.47" / 12.0 mm 90.0 cal guns - 0.07lbs / 0.03kg shells, 2,000 per gun
          Machine guns in deck mounts, 1924 Model
          2 x Single mounts on sides, forward deck centre
                2 raised mounts
          2 x Single mounts on sides, aft deck aft
                2 raised mounts
      Weight of broadside 45 lbs / 20 kg

Armour:
  - Gun armour:        Face (max)      Other gunhouse (avg)    Barbette/hoist (max)
        Main:  0.98" / 25 mm        -                      -
        2nd:    0.79" / 20 mm        -                      -

Machinery:
        Oil fired boilers, steam turbines,
        Geared drive, 2 shafts, 1,273 shp / 950 Kw = 16.01 kts
        Range 3,000nm at 10.00 kts
        Bunker at max displacement = 39 tons

Complement:
        33 - 44

Cost:
        £0.052 million / $0.210 million

Distribution of weights at normal displacement:
        Armament: 8 tons, 3.0 %
          - Guns: 8 tons, 3.0 %
        Armour: 4 tons, 1.3 %
          - Armament: 4 tons, 1.3 %
        Machinery: 42 tons, 14.8 %
        Hull, fittings & equipment: 115 tons, 40.3 %
        Fuel, ammunition & stores: 33 tons, 11.8 %
        Miscellaneous weights: 82 tons, 28.9 %
          - Hull below water: 5 tons
          - On freeboard deck: 65 tons
          - Above deck: 12 tons

Overall survivability and seakeeping ability:
        Survivability (Non-critical penetrating hits needed to sink ship):
          792 lbs / 359 Kg = 19.5 x 4.3 " / 110 mm shells or 0.7 torpedoes
        Stability (Unstable if below 1.00): 1.13
        Metacentric height 0.6 ft / 0.2 m
        Roll period: 11.5 seconds
        Steadiness      - As gun platform (Average = 50 %): 50 %
                        - Recoil effect (Restricted arc if above 1.00): 0.23
        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): 0.500 / 0.507
        Length to Beam Ratio: 5.22 : 1
        'Natural speed' for length: 10.72 kts
        Power going to wave formation at top speed: 69 %
        Trim (Max stability = 0, Max steadiness = 100): 25
        Bow angle (Positive = bow angles forward): 10.00 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 %,  17.72 ft / 5.40 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:  25.00 %,  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:        12.76 ft / 3.89 m

Ship space, strength and comments:
        Space  - Hull below water (magazines/engines, low = better): 60.0 %
                - Above water (accommodation/working, high = better): 123.5 %
        Waterplane Area: 1,682 Square feet or 156 Square metres
        Displacement factor (Displacement / loading): 148 %
        Structure weight / hull surface area: 28 lbs/sq ft or 137 Kg/sq metre
        Hull strength (Relative):
                - Cross-sectional: 0.70
                - Longitudinal: 24.43
                - Overall: 1.00
        Excellent machinery, storage, compartmentation space
        Excellent accommodation and workspace room
        Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Fittings:
-1 t: 1918 Fire control (above deck)
-1 t: 1x spotlight (above deck)
-25 t: Provision for mines (on deck)
-25 t: Minesweeping gear (on deck)
-10 t: 25x 195kg DC (on deck)
-5 t: Basic hydrophone (vital)
-12 + 5 t: Weight reserve (above deck + on deck)

Range: 3300 nm (geared bonus)

[Jeremy]

MS-24, Laksmanavati, Coastal Minesweeper laid down 1928

A subclass of the MS-14 class, the M-24s added a twin 40/39 AA gun aft and installed an improved hyrdophone set. Ten ships were initially constructed (MS-24 through MS-33) with no additional MS-14s expected to be laid.

Displacement:
        247 t light; 263 t standard; 284 t normal; 301 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
        (121.89 ft / 114.83 ft) x 21.98 ft x (7.87 / 8.22 ft)
        (37.15 m / 35.00 m) x 6.70 m  x (2.40 / 2.51 m)

Armament:
      1 - 4.33" / 110 mm 45.0 cal gun - 40.96lbs / 18.58kg shells, 250 per gun
          Quick firing gun in deck mount, 1928 Model
          1 x Single mount on centreline, forward deck forward
      4 - 1.57" / 40.0 mm 39.0 cal guns - 1.85lbs / 0.84kg shells, 900 per gun
          Anti-air guns in deck mounts, 1928 Model
          2 x Single mounts on sides, forward deck centre
          1 x Twin mount on centreline, aft deck aft
                1 raised mount
      4 - 0.47" / 12.0 mm 90.0 cal guns - 0.07lbs / 0.03kg shells, 4,000 per gun
          Machine guns in deck mounts, 1928 Model
          2 x Single mounts on sides, forward deck centre
                2 raised mounts
          2 x Single mounts on sides, aft deck aft
                2 raised mounts
      Weight of broadside 49 lbs / 22 kg

Armour:
  - Gun armour:        Face (max)      Other gunhouse (avg)    Barbette/hoist (max)
        Main:  0.98" / 25 mm        -                      -
        2nd:    0.79" / 20 mm        -                      -

Machinery:
        Oil fired boilers, steam turbines,
        Geared drive, 2 shafts, 1,273 shp / 950 Kw = 16.01 kts
        Range 3,000nm at 10.00 kts
        Bunker at max displacement = 38 tons

Complement:
        33 - 44

Cost:
        £0.064 million / $0.256 million

Distribution of weights at normal displacement:
        Armament: 9 tons, 3.2 %
          - Guns: 9 tons, 3.2 %
        Armour: 4 tons, 1.5 %
          - Armament: 4 tons, 1.5 %
        Machinery: 40 tons, 14.0 %
        Hull, fittings & equipment: 106 tons, 37.5 %
        Fuel, ammunition & stores: 37 tons, 12.9 %
        Miscellaneous weights: 88 tons, 31.0 %
          - Hull below water: 15 tons
          - On freeboard deck: 63 tons
          - Above deck: 10 tons

Overall survivability and seakeeping ability:
        Survivability (Non-critical penetrating hits needed to sink ship):
          707 lbs / 321 Kg = 17.4 x 4.3 " / 110 mm shells or 0.7 torpedoes
        Stability (Unstable if below 1.00): 1.16
        Metacentric height 0.7 ft / 0.2 m
        Roll period: 11.2 seconds
        Steadiness      - As gun platform (Average = 50 %): 50 %
                        - Recoil effect (Restricted arc if above 1.00): 0.26
        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): 0.500 / 0.507
        Length to Beam Ratio: 5.22 : 1
        'Natural speed' for length: 10.72 kts
        Power going to wave formation at top speed: 69 %
        Trim (Max stability = 0, Max steadiness = 100): 25
        Bow angle (Positive = bow angles forward): 10.00 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 %,  17.72 ft / 5.40 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:  25.00 %,  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:        12.76 ft / 3.89 m

Ship space, strength and comments:
        Space  - Hull below water (magazines/engines, low = better): 63.2 %
                - Above water (accommodation/working, high = better): 123.5 %
        Waterplane Area: 1,682 Square feet or 156 Square metres
        Displacement factor (Displacement / loading): 145 %
        Structure weight / hull surface area: 26 lbs/sq ft or 128 Kg/sq metre
        Hull strength (Relative):
                - Cross-sectional: 0.65
                - Longitudinal: 22.80
                - Overall: 0.93
        Caution: Hull subject to strain in open-sea
        Excellent machinery, storage, compartmentation space
        Excellent accommodation and workspace room
        Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Fittings:
-1 t: 1918 Fire control (above deck)
-1 t: 1x spotlight (above deck)
-25 t: Provision for mines (on deck)
-25 t: Minesweeping gear (on deck)
-10 t: 25x 195kg DC (on deck)
-15 t:  Enhanced hydrophone package (vital)
-8 + 3 t: Weight reserve (above deck + on deck)

Range: 3300 nm (geared bonus)