WesWorld

ML-1937, Siam Minelayer laid down 1937

Displacement:
900 t light; 937 t standard; 1,186 t normal; 1,385 t full load

Dimensions: Length overall / water x beam x draught
216.67 ft / 213.25 ft x 39.37 ft x 9.02 ft (normal load)
66.04 m / 65.00 m x 12.00 m x 2.75 m

Armament:
3 - 3.94" / 100 mm guns in single mounts, 30.86lbs / 14.00kg shells, 1937 Model
Quick firing guns in deck mounts
on centreline ends, majority forward, 2 raised mounts - superfiring
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
8 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 106 lbs / 48 kg
Shells per gun, main battery: 200

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 0.39" / 10 mm -
2nd: 0.98" / 25 mm - -
3rd: 0.98" / 25 mm - -

- Conning tower: 1.57" / 40 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 3,815 shp / 2,846 Kw = 18.00 kts
Range 6,270nm at 15.00 kts
Bunker at max displacement = 449 tons

Complement:
100 - 131

Cost:
£0.312 million / $1.250 million

Distribution of weights at normal displacement:
Armament: 13 tons, 1.1 %
Armour: 13 tons, 1.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 9 tons, 0.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 4 tons, 0.3 %
Machinery: 106 tons, 8.9 %
Hull, fittings & equipment: 468 tons, 39.5 %
Fuel, ammunition & stores: 286 tons, 24.1 %
Miscellaneous weights: 300 tons, 25.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3,117 lbs / 1,414 Kg = 102.1 x 3.9 " / 100 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 1.6 ft / 0.5 m
Roll period: 13.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.10
Seaboat quality (Average = 1.00): 1.42

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.548
Length to Beam Ratio: 5.42 : 1
'Natural speed' for length: 14.60 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 49
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: -3.28 ft / -1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.36 ft / 5.90 m
- Forecastle (20 %): 16.01 ft / 4.88 m
- Mid (50 %): 16.01 ft / 4.88 m
- Quarterdeck (30 %): 8.01 ft / 2.44 m (16.01 ft / 4.88 m before break)
- Stern: 8.01 ft / 2.44 m
- Average freeboard: 13.88 ft / 4.23 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 66.1 %
- Above water (accommodation/working, high = better): 178.4 %
Waterplane Area: 5,848 Square feet or 543 Square metres
Displacement factor (Displacement / loading): 189 %
Structure weight / hull surface area: 53 lbs/sq ft or 256 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 4.12
- Overall: 1.07
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Designed to be capable and robust minelayer to quickly lay patterns.

Aft 100mm is raised to allow clear fields of fire
Aft is cut down to serve as mine deck.
Mine Capacity : 200 x 1-ton mines

50 t Additional facilities are given over to ASW gear, including amid-ships K-dischargers, to allow alternate role.

Seven units. Designed by Kaiser Kirk

MWS-1937, Siam Minesweeper laid down 1937

Displacement:
350 t light; 368 t standard; 405 t normal; 435 t full load

Dimensions: Length overall / water x beam x draught
166.52 ft / 164.04 ft x 22.97 ft (Bulges 29.53 ft) x 5.74 ft (normal load)
50.76 m / 50.00 m x 7.00 m (Bulges 9.00 m) x 1.75 m

Armament:
2 - 3.94" / 100 mm guns in single mounts, 30.86lbs / 14.00kg shells, 1937 Model
Quick firing guns in deck mounts
on centreline, all forward, 1 raised mount
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
8 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 75 lbs / 34 kg
Shells per gun, main battery: 200

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 0.39" / 10 mm -
2nd: 0.98" / 25 mm - -
3rd: 0.98" / 25 mm - -

- Conning tower: 1.57" / 40 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,338 shp / 998 Kw = 16.00 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 67 tons

Complement:
44 - 58

Cost:
£0.138 million / $0.550 million

Distribution of weights at normal displacement:
Armament: 9 tons, 2.3 %
Armour: 9 tons, 2.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 7 tons, 1.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.5 %
Machinery: 37 tons, 9.1 %
Hull, fittings & equipment: 195 tons, 48.1 %
Fuel, ammunition & stores: 55 tons, 13.6 %
Miscellaneous weights: 100 tons, 24.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
741 lbs / 336 Kg = 24.3 x 3.9 " / 100 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 0.7 ft / 0.2 m
Roll period: 14.9 seconds
Steadiness - As gun platform (Average = 50 %): 76 %
- Recoil effect (Restricted arc if above 1.00): 0.14
Seaboat quality (Average = 1.00): 1.51

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.510
Length to Beam Ratio: 5.56 : 1
'Natural speed' for length: 12.81 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: -3.28 ft / -1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 14.07 ft / 4.29 m
- Forecastle (20 %): 12.24 ft / 3.73 m (8.96 ft / 2.73 m aft of break)
- Mid (50 %): 8.96 ft / 2.73 m
- Quarterdeck (30 %): 8.96 ft / 2.73 m
- Stern: 8.96 ft / 2.73 m
- Average freeboard: 9.76 ft / 2.97 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 75.6 %
- Above water (accommodation/working, high = better): 98.2 %
Waterplane Area: 2,533 Square feet or 235 Square metres
Displacement factor (Displacement / loading): 158 %
Structure weight / hull surface area: 41 lbs/sq ft or 200 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.02
- Longitudinal: 4.89
- Overall: 1.19
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
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Designed as an ocean going minesweeper, she is double hulled (bulges) in an effort to contain the effects of sprung seams.

Twelve units. Designed by Kaiser Kirk