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