WesWorld

Sri Ayuthia, Siam Armored Cruiser laid down 1921 Decommissioned and sold to China Q3 1940. Delivery in 1941.

Displacement:
10,360 t light; 10,922 t standard; 12,522 t normal; 13,802 t full load

Dimensions: Length overall / water x beam x draught
480.97 ft / 474.41 ft x 73.49 ft x 25.92 ft (normal load)
146.60 m / 144.60 m x 22.40 m x 7.90 m

Armament:
4 - 8.00" / 203 mm guns (2x2 guns), 256.00lbs / 116.12kg shells, 1921 Model
Breech loading guns in turrets (on barbettes)
on centreline, evenly spread
8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1921 Model
Breech loading guns in turrets (on barbettes)
on side, all forward
8 - 3.94" / 100 mm guns in single mounts, 30.51lbs / 13.84kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread
12 - 2.24" / 57.0 mm guns (6x2 guns), 5.65lbs / 2.56kg shells, 1935 Model
Dual purpose guns in deck mounts
on side, evenly spread
12 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1921 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 3,387 lbs / 1,536 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 9.84" / 250 mm 262.47 ft / 80.00 m 12.30 ft / 3.75 m
Ends: Unarmoured
Upper: 3.15" / 80 mm 262.47 ft / 80.00 m 0.00 ft / 0.00 m
Main Belt covers 85 % of normal length
Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.91" / 150 mm 3.15" / 80 mm 4.72" / 120 mm
2nd: 5.91" / 150 mm 3.15" / 80 mm 4.72" / 120 mm
3rd: 0.79" / 20 mm - -
4th: 0.79" / 20 mm - -

- Armour deck: 1.97" / 50 mm, Conning tower: 5.91" / 150 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 66,014 shp / 49,247 Kw = 28.04 kts
Range 4,750nm at 20.00 kts
Bunker at max displacement = 2,880 tons

Complement:
591 - 769

Cost:
£2.638 million / $10.553 million

Distribution of weights at normal displacement:
Armament: 423 tons, 3.4 %
Armour: 3,102 tons, 24.8 %
- Belts: 1,431 tons, 11.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 768 tons, 6.1 %
- Armour Deck: 835 tons, 6.7 %
- Conning Tower: 69 tons, 0.5 %
Machinery: 2,273 tons, 18.2 %
Hull, fittings & equipment: 4,512 tons, 36.0 %
Fuel, ammunition & stores: 2,162 tons, 17.3 %
Miscellaneous weights: 50 tons, 0.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
16,849 lbs / 7,643 Kg = 65.8 x 8.0 " / 203 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 4.4 ft / 1.3 m
Roll period: 14.8 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.41
Seaboat quality (Average = 1.00): 1.01

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.485
Length to Beam Ratio: 6.46 : 1
'Natural speed' for length: 21.78 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -12.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.95 ft / 7.30 m
- Forecastle (20 %): 21.62 ft / 6.59 m
- Mid (50 %): 21.62 ft / 6.59 m
- Quarterdeck (25 %): 13.29 ft / 4.05 m (21.62 ft / 6.59 m before break)
- Stern: 13.29 ft / 4.05 m
- Average freeboard: 19.72 ft / 6.01 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 86.2 %
- Above water (accommodation/working, high = better): 159.7 %
Waterplane Area: 22,918 Square feet or 2,129 Square metres
Displacement factor (Displacement / loading): 113 %
Structure weight / hull surface area: 127 lbs/sq ft or 621 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 2.45
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

One unit