WesWorld

Quoted

Ratanakosindra, Siamese CDS laid down 1924

Displacement:
862 t light; 908 t standard; 1,002 t normal; 1,077 t full load

Dimensions: Length overall / water x beam x draught
167.22 ft / 166.00 ft x 37.00 ft x 10.75 ft (normal load)
50.97 m / 50.60 m x 11.28 m x 3.28 m

Armament:
2 - 6.00" / 152 mm guns in single mounts, 100.00lbs / 45.36kg shells, 1924 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1924 Model
Anti-aircraft guns in deck mounts
on side, all amidships, 2 raised mounts - superfiring
12 - 1.46" / 37.0 mm guns (6x2 guns), 1.55lbs / 0.70kg shells, 1924 Model
Dual purpose guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 273 lbs / 124 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.50" / 64 mm 108.00 ft / 32.92 m 7.50 ft / 2.29 m
Ends: 1.25" / 32 mm 58.00 ft / 17.68 m 7.50 ft / 2.29 m
Main Belt covers 100 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.00" / 76 mm 1.50" / 38 mm 2.50" / 64 mm
2nd: 0.50" / 13 mm - -
3rd: 0.50" / 13 mm - -

- Armour deck: 2.00" / 51 mm, Conning tower: 2.50" / 64 mm

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 852 ihp / 635 Kw = 12.40 kts
Range 5,000nm at 10.00 kts
Bunker at max displacement = 169 tons

Complement:
88 - 115

Cost:
£0.208 million / $0.833 million

Distribution of weights at normal displacement:
Armament: 36 tons, 3.6 %
Armour: 313 tons, 31.3 %
- Belts: 112 tons, 11.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 41 tons, 4.1 %
- Armour Deck: 156 tons, 15.6 %
- Conning Tower: 5 tons, 0.5 %
Machinery: 49 tons, 4.9 %
Hull, fittings & equipment: 339 tons, 33.8 %
Fuel, ammunition & stores: 139 tons, 13.9 %
Miscellaneous weights: 125 tons, 12.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,091 lbs / 948 Kg = 19.4 x 6.0 " / 152 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 1.6 ft / 0.5 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.31
Seaboat quality (Average = 1.00): 1.98

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.531
Length to Beam Ratio: 4.49 : 1
'Natural speed' for length: 12.88 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 36
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: 14.00 ft / 4.27 m
- Forecastle (20 %): 14.00 ft / 4.27 m
- Mid (50 %): 14.00 ft / 4.27 m (7.00 ft / 2.13 m aft of break)
- Quarterdeck (15 %): 7.00 ft / 2.13 m
- Stern: 7.00 ft / 2.13 m
- Average freeboard: 10.50 ft / 3.20 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 58.3 %
- Above water (accommodation/working, high = better): 93.2 %
Waterplane Area: 4,211 Square feet or 391 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 54 lbs/sq ft or 265 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.85
- Longitudinal: 4.14
- Overall: 1.00
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

Cost: 43 tons to refit


Refit includes 6x2x37mm AA guns and 100 tons of concrete (@150 lbs per cubic foot) in a layer 4" deep over the armored deck protecting the vital spaces of the ship (determined by belt length), 1.5" of additional armor bolted to the turret faces and 25 tons of additional stores.