WesWorld

Sukhothai (ex-Alberico da Barbiano), Thai (ex-Italian) Light Aircraft Carrier laid down 1925 (Engine 1934)

Displacement:
5,602 t light; 5,781 t standard; 6,664 t normal; 7,371 t full load

Dimensions: Length overall / water x beam x draught
539.12 ft / 524.93 ft x 52.49 ft x 19.69 ft (normal load)
164.32 m / 160.00 m x 16.00 m x 6.00 m

Armament:
1 - 5.98" / 152 mm guns in single mounts, 110.23lbs / 50.00kg shells, 1925 Model
Breech loading gun in deck mount
on centreline forward
12 - 1.85" / 47.0 mm guns (3x4 guns), 3.86lbs / 1.75kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
4 - 1.85" / 47.0 mm guns (2x2 guns), 3.86lbs / 1.75kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, all forward
Weight of broadside 172 lbs / 78 kg
Shells per gun, main battery: 400

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.76" / 70 mm 449.48 ft / 137.00 m 8.69 ft / 2.65 m
Ends: Unarmoured
Main Belt covers 132 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -

- Armour deck: 1.38" / 35 mm, Conning tower: 1.42" / 36 mm

Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Geared drive, 2 shafts, 62,000 shp / 46,252 Kw = 32.63 kts
Range 5,000nm at 20.00 kts
Bunker at max displacement = 1,589 tons

Complement:
368 - 479

Cost:
£1.513 million / $6.053 million

Distribution of weights at normal displacement:
Armament: 20 tons, 0.3 %
Armour: 903 tons, 13.6 %
- Belts: 428 tons, 6.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 0.1 %
- Armour Deck: 458 tons, 6.9 %
- Conning Tower: 11 tons, 0.2 %
Machinery: 1,784 tons, 26.8 %
Hull, fittings & equipment: 2,096 tons, 31.4 %
Fuel, ammunition & stores: 1,062 tons, 15.9 %
Miscellaneous weights: 800 tons, 12.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,924 lbs / 3,141 Kg = 64.6 x 6.0 " / 152 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 2.3 ft / 0.7 m
Roll period: 14.6 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 1.14

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.430
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 26.38 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 62
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 9.84 ft / 3.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (20 %): 22.97 ft / 7.00 m
- Mid (38 %): 22.97 ft / 7.00 m (14.76 ft / 4.50 m aft of break)
- Quarterdeck (15 %): 14.76 ft / 4.50 m
- Stern: 14.76 ft / 4.50 m
- Average freeboard: 18.01 ft / 5.49 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 103.1 %
- Above water (accommodation/working, high = better): 158.4 %
Waterplane Area: 17,967 Square feet or 1,669 Square metres
Displacement factor (Displacement / loading): 123 %
Structure weight / hull surface area: 70 lbs/sq ft or 343 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.87
- Longitudinal: 1.41
- Overall: 0.91
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform

Barbettes = 98tons
700tons = aircraft and vehicles

Two ships: Sukhothai and Sri Ayuthia (name changed after CA of same name was sold to China)


Image by Red Admiral

Rachan, Thailand Aircraft Carrier laid down 1948


Displacement:
8,122 t light; 8,374 t standard; 8,979 t normal; 9,463 t full load


Dimensions: Length overall / water x beam x draught
555.00 ft / 555.00 ft x 58.00 ft x 17.75 ft (normal load)
169.16 m / 169.16 m x 17.68 m x 5.41 m


Armament:
10 - 3.94" / 100 mm guns in single mounts, 30.51lbs / 13.84kg shells, 1948 Model
Dual purpose guns in deck mounts with hoists
on side, evenly spread
40 - 1.57" / 40.0 mm guns (10x4 guns), 1.95lbs / 0.88kg shells, 1948 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 383 lbs / 174 kg
Shells per gun, main battery: 300


Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.36" / 60 mm 295.28 ft / 90.00 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 82 % of normal length


- Armour deck: 3.15" / 80 mm, Conning tower: 2.36" / 60 mm


Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 56,216 shp / 41,937 Kw = 30.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 1,089 tons


Complement:
460 - 599


Cost:
£3.853 million / $15.412 million


Distribution of weights at normal displacement:
Armament: 48 tons, 0.5 %
Armour: 1,682 tons, 18.7 %
- Belts: 297 tons, 3.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 1,363 tons, 15.2 %
- Conning Tower: 22 tons, 0.2 %
Machinery: 1,374 tons, 15.3 %
Hull, fittings & equipment: 2,819 tons, 31.4 %
Fuel, ammunition & stores: 856 tons, 9.5 %
Miscellaneous weights: 2,200 tons, 24.5 %


Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
12,956 lbs / 5,877 Kg = 424.6 x 3.9 " / 100 mm shells or 1.9 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 2.6 ft / 0.8 m
Roll period: 15.1 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.09


Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.550
Length to Beam Ratio: 9.57 : 1
'Natural speed' for length: 26.83 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.00 ft / 7.62 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (50 %): 16.00 ft / 4.88 m
- Quarterdeck (15 %): 16.00 ft / 4.88 m
- Stern: 16.49 ft / 5.03 m
- Average freeboard: 17.84 ft / 5.44 m
Ship tends to be wet forward


Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 81.5 %
- Above water (accommodation/working, high = better): 163.9 %
Waterplane Area: 23,388 Square feet or 2,173 Square metres
Displacement factor (Displacement / loading): 128 %
Structure weight / hull surface area: 81 lbs/sq ft or 397 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.09
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent


50t Misc Weight, Radars
1800t Misc Weight, Hangar and flight deck accomodations (2 catapults, 2 elevators) for 30 aircraft (Jet or Prop)
150t Misc Weight, Aviation Ordnance
200t Misc Weight, Aviation Fuels