Thai Ships

[Khryses]

The Thai were not a major seapower, focusing on controlling her own coastline and major waterways as well as posing a credible threat to force potential opponents to guard themselves if they chose to pick a fight.

Nang Kwak-class, (Nang Kwak, Phi Fa, Phosop)
Armoured Coastal Battleship laid down 1920

Displacement:
   8,379 t light; 9,044 t standard; 9,299 t normal; 9,503 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (421.92 ft / 419.95 ft) x 65.62 ft x (19.69 / 20.04 ft)
   (128.60 m / 128.00 m) x 20.00 m  x (6.00 / 6.11 m)

Armament:
      4 - 11.00" / 279 mm 45.0 cal guns - 671.18lbs / 304.44kg shells, 200 per gun
     Breech loading guns in turret on barbette mounts, 1920 Model
     1 x Twin mount on centreline, forward deck centre
     1 x Twin mount on centreline, aft deck centre
      6 - 8.00" / 203 mm 50.0 cal guns - 271.01lbs / 122.93kg shells, 200 per gun
     Breech loading guns in casemate mounts, 1920 Model
     6 x Single mounts on sides, evenly spread
      12 - 0.31" / 8.0 mm 50.0 cal guns - 0.02lbs / 0.01kg shells, 5,000 per gun
     Machine guns in deck mounts, 1920 Model
     12 x Single mounts on sides, evenly spread
      Weight of broadside 4,311 lbs / 1,955 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   10.0" / 254 mm   242.78 ft / 74.00 m   9.84 ft / 3.00 m
   Ends:   3.98" / 101 mm   177.17 ft / 54.00 m   9.84 ft / 3.00 m
   Upper:   3.98" / 101 mm   242.78 ft / 74.00 m   9.84 ft / 3.00 m
     Main Belt covers 89 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   10.0" / 254 mm   5.00" / 127 mm      10.0" / 254 mm
   2nd:   4.72" / 120 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 0.87" / 22 mm

   - Conning towers: Forward 10.00" / 254 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 38,494 shp / 28,717 Kw = 25.00 kts
   Range 3,000nm at 10.00 kts
   Bunker at max displacement = 458 tons (90% coal)

Complement:
   473 - 615

Cost:
   £1.972 million / $7.886 million

Distribution of weights at normal displacement:
   Armament: 751 tons, 8.1 %
      - Guns: 751 tons, 8.1 %
   Armour: 2,741 tons, 29.5 %
      - Belts: 1,754 tons, 18.9 %
      - Armament: 627 tons, 6.7 %
      - Armour Deck: 265 tons, 2.8 %
      - Conning Tower: 95 tons, 1.0 %
   Machinery: 1,466 tons, 15.8 %
   Hull, fittings & equipment: 3,240 tons, 34.8 %
   Fuel, ammunition & stores: 920 tons, 9.9 %
   Miscellaneous weights: 181 tons, 1.9 %
      - Hull below water: 132 tons
      - Hull above water: 16 tons
      - Above deck: 33 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11,523 lbs / 5,227 Kg = 17.3 x 11.0 " / 279 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 1.07
   Metacentric height 3.0 ft / 0.9 m
   Roll period: 15.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.79
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.602
   Length to Beam Ratio: 6.40 : 1
   'Natural speed' for length: 20.49 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: -6.56 ft / -2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  22.54 ft / 6.87 m,  20.34 ft / 6.20 m
      - Forward deck:   30.00 %,  20.34 ft / 6.20 m,  18.04 ft / 5.50 m
      - Aft deck:   35.00 %,  18.04 ft / 5.50 m,  17.06 ft / 5.20 m
      - Quarter deck:   15.00 %,  17.06 ft / 5.20 m,  17.06 ft / 5.20 m
      - Average freeboard:      18.70 ft / 5.70 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 88.9 %
      - Above water (accommodation/working, high = better): 148.6 %
   Waterplane Area: 20,154 Square feet or 1,872 Square metres
   Displacement factor (Displacement / loading): 103 %
   Structure weight / hull surface area: 121 lbs/sq ft or 591 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.25
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

128t - torpedo netting
24t - FC
25t - night fighting equipment (searchlight tower et al)
4t - 4 x 21" torpedo in tube, submerged bow

[Desertfox]

Whats the ship and engine dates? It could use a heavier secondary and some more deck armor.

[Khryses]

1920 for each; I originally abandoned the secondaries for Seakeeping purposes, but I ended up stepping down the primaries an inch to get six secondaries back in 8".

Updated.

[TacCovert4]

Dump the incline on the belt, make sure the main belt covers the magazines.

[Khryses]

Updated to reflect advice and concerns.

And now, the Cruiser classes!

1910 Thai Cruiser class Nong Sa Rai

Displacement:
   7,910 t light; 8,349 t standard; 8,999 t normal; 9,518 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (402.37 ft / 387.14 ft) x 59.06 ft x (21.33 / 22.37 ft)
   (122.64 m / 118.00 m) x 18.00 m  x (6.50 / 6.82 m)

Armament:
      4 - 10.00" / 254 mm 45.0 cal guns - 504.26lbs / 228.73kg shells, 180 per gun
     Breech loading guns in turret on barbette mounts, 1910 Model
     2 x Twin mounts on centreline, evenly spread
      6 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
     Breech loading guns in deck and hoist mounts, 1910 Model
     8 x Single mounts on sides, evenly spread
      8 - 0.31" / 8.0 mm 50.0 cal guns - 0.02lbs / 0.01kg shells, 6,000 per gun
     Machine guns in deck mounts, 1910 Model
     8 x Single mounts on sides, evenly spread
      Weight of broadside 2,703 lbs / 1,226 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.09" / 180 mm   251.64 ft / 76.70 m   9.22 ft / 2.81 m
   Ends:   3.94" / 100 mm   135.47 ft / 41.29 m   9.22 ft / 2.81 m
   Upper:   3.94" / 100 mm   251.64 ft / 76.70 m   8.01 ft / 2.44 m
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   7.09" / 180 mm   3.94" / 100 mm      7.09" / 180 mm
   2nd:   3.94" / 100 mm         -         3.94" / 100 mm

   - Armoured deck - multiple decks:
   For and Aft decks: 2.36" / 60 mm

   - Conning towers: Forward 3.94" / 100 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 41,155 shp / 30,702 Kw = 25.20 kts
   Range 6,000nm at 10.00 kts
   Bunker at max displacement = 1,169 tons (90% coal)

Complement:
   461 - 600

Cost:
   £0.797 million / $3.187 million

Distribution of weights at normal displacement:
   Armament: 650 tons, 7.2 %
      - Guns: 650 tons, 7.2 %
   Armour: 2,434 tons, 27.0 %
      - Belts: 1,249 tons, 13.9 %
      - Armament: 524 tons, 5.8 %
      - Armour Deck: 625 tons, 6.9 %
      - Conning Tower: 37 tons, 0.4 %
   Machinery: 1,852 tons, 20.6 %
   Hull, fittings & equipment: 2,929 tons, 32.6 %
   Fuel, ammunition & stores: 1,089 tons, 12.1 %
   Miscellaneous weights: 44 tons, 0.5 %
      - Hull above water: 16 tons
      - On freeboard deck: 10 tons
      - Above deck: 18 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     11,021 lbs / 4,999 Kg = 22.0 x 10.0 " / 254 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.05
   Metacentric height 2.5 ft / 0.8 m
   Roll period: 15.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.99
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.646 / 0.651
   Length to Beam Ratio: 6.56 : 1
   'Natural speed' for length: 19.68 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 8.20 ft / 2.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  26.25 ft / 8.00 m,  24.28 ft / 7.40 m
      - Forward deck:   30.00 %,  24.28 ft / 7.40 m,  22.31 ft / 6.80 m
      - Aft deck:   35.00 %,  22.31 ft / 6.80 m,  22.31 ft / 6.80 m
      - Quarter deck:   15.00 %,  22.31 ft / 6.80 m,  21.33 ft / 6.50 m
      - Average freeboard:      23.08 ft / 7.04 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 94.6 %
      - Above water (accommodation/working, high = better): 164.1 %
   Waterplane Area: 17,450 Square feet or 1,621 Square metres
   Displacement factor (Displacement / loading): 104 %
   Structure weight / hull surface area: 109 lbs/sq ft or 532 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 3.90
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

24t FC
20t nightfighting equipment

1920 Thai Cruiser class Naresuan

Displacement:
   9,459 t light; 10,060 t standard; 10,559 t normal; 10,957 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (467.81 ft / 452.76 ft) x 75.46 ft x (22.97 / 23.59 ft)
   (142.59 m / 138.00 m) x 23.00 m  x (7.00 / 7.19 m)

Armament:
      4 - 11.00" / 279 mm 45.0 cal guns - 671.18lbs / 304.44kg shells, 200 per gun
     Breech loading guns in turret on barbette mounts, 1920 Model
     2 x Twin mounts on centreline, evenly spread
      8 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 180 per gun
     Breech loading guns in deck and hoist mounts, 1920 Model
     8 x Single mounts on sides, evenly spread
      8 - 0.31" / 8.0 mm 50.0 cal guns - 0.02lbs / 0.01kg shells, 6,000 per gun
     Machine guns in deck mounts, 1920 Model
     8 x Single mounts on sides, evenly spread
      Weight of broadside 3,600 lbs / 1,633 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.09" / 180 mm   294.29 ft / 89.70 m   10.14 ft / 3.09 m
   Ends:   3.94" / 100 mm   158.43 ft / 48.29 m   10.14 ft / 3.09 m
   Upper:   3.94" / 100 mm   294.29 ft / 89.70 m   6.56 ft / 2.00 m
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   7.09" / 180 mm   3.94" / 100 mm      7.09" / 180 mm
   2nd:   3.94" / 100 mm         -         3.94" / 100 mm

   - Armoured deck - multiple decks:
   For and Aft decks: 2.36" / 60 mm

   - Conning towers: Forward 3.94" / 100 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 46,199 shp / 34,465 Kw = 26.22 kts
   Range 6,000nm at 10.00 kts
   Bunker at max displacement = 897 tons (90% coal)

Complement:
   520 - 677

Cost:
   £2.185 million / $8.739 million

Distribution of weights at normal displacement:
   Armament: 758 tons, 7.2 %
      - Guns: 758 tons, 7.2 %
   Armour: 2,859 tons, 27.1 %
      - Belts: 1,481 tons, 14.0 %
      - Armament: 542 tons, 5.1 %
      - Armour Deck: 795 tons, 7.5 %
      - Conning Tower: 41 tons, 0.4 %
   Machinery: 1,759 tons, 16.7 %
   Hull, fittings & equipment: 4,039 tons, 38.3 %
   Fuel, ammunition & stores: 1,100 tons, 10.4 %
   Miscellaneous weights: 44 tons, 0.4 %
      - Hull above water: 16 tons
      - On freeboard deck: 10 tons
      - Above deck: 18 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     14,926 lbs / 6,770 Kg = 22.4 x 11.0 " / 279 mm shells or 2.1 torpedoes
   Stability (Unstable if below 1.00): 1.18
   Metacentric height 4.5 ft / 1.4 m
   Roll period: 15.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.49
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.471 / 0.476
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 21.28 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 59
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 8.20 ft / 2.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  25.59 ft / 7.80 m,  22.31 ft / 6.80 m
      - Forward deck:   30.00 %,  22.31 ft / 6.80 m,  20.34 ft / 6.20 m
      - Aft deck:   35.00 %,  20.34 ft / 6.20 m,  19.69 ft / 6.00 m
      - Quarter deck:   15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      21.08 ft / 6.43 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 86.0 %
      - Above water (accommodation/working, high = better): 167.5 %
   Waterplane Area: 22,182 Square feet or 2,061 Square metres
   Displacement factor (Displacement / loading): 109 %
   Structure weight / hull surface area: 131 lbs/sq ft or 639 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.73
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

24t FC
20t nightfighting equipment

[The Rock Doctor]

Note that you have some excess hull strength on these last two designs that can be utilized for fun things.

[Khryses]

Above ship designs are not final, and need changes I can't apply to them just yet (but will note when done).

But now - Destroyers!

A-class (laid down 1910) and D-class (laid down 1920). Will assume that B and C classes fall somewhere between the two as needed.

A-class, Thailand Destroyer laid down 1910

Displacement:
   500 t light; 516 t standard; 571 t normal; 615 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (270.87 ft / 262.47 ft) x 24.61 ft x (7.22 / 7.60 ft)
   (82.56 m / 80.00 m) x 7.50 m  x (2.20 / 2.32 m)

Armament:
      1 - 4.02" / 102 mm 45.0 cal gun - 32.66lbs / 14.81kg shells, 200 per gun
     Breech loading gun in deck mount, 1910 Model
     1 x Single mount on centreline amidships (forward deck)
      4 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1910 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 33 lbs / 15 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.18" / 30 mm         -               -

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 12,105 ihp / 9,030 Kw = 30.94 kts
   Range 2,600nm at 10.00 kts
   Bunker at max displacement = 99 tons (90% coal)
     Caution: Delicate, lightweight machinery

Complement:
   57 - 75

Cost:
   £0.064 million / $0.254 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 1.0 %
      - Guns: 6 tons, 1.0 %
   Armour: 3 tons, 0.5 %
      - Armament: 3 tons, 0.5 %
   Machinery: 317 tons, 55.5 %
   Hull, fittings & equipment: 158 tons, 27.7 %
   Fuel, ammunition & stores: 71 tons, 12.4 %
   Miscellaneous weights: 17 tons, 2.9 %
      - On freeboard deck: 12 tons
      - Above deck: 5 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     164 lbs / 74 Kg = 5.1 x 4.0 " / 102 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.27
   Metacentric height 0.9 ft / 0.3 m
   Roll period: 10.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.08
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.429 / 0.439
   Length to Beam Ratio: 10.67 : 1
   'Natural speed' for length: 16.20 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 8.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  13.12 ft / 4.00 m,  11.15 ft / 3.40 m
      - Forward deck:   30.00 %,  11.15 ft / 3.40 m,  9.61 ft / 2.93 m
      - Aft deck:   35.00 %,  9.61 ft / 2.93 m,  9.61 ft / 2.93 m
      - Quarter deck:   15.00 %,  9.61 ft / 2.93 m,  9.61 ft / 2.93 m
      - Average freeboard:      10.31 ft / 3.14 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 182.5 %
      - Above water (accommodation/working, high = better): 135.0 %
   Waterplane Area: 4,052 Square feet or 376 Square metres
   Displacement factor (Displacement / loading): 35 %
   Structure weight / hull surface area: 22 lbs/sq ft or 105 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.51
      - Longitudinal: 1.42
      - Overall: 0.56
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

--8t = 4 x 1 TT, 18" swivel centreline
--0.6t = Fire Control
--8t = Night Vision Equipment

D-class, Thailand Destroyer laid down 1920

Displacement:
   750 t light; 777 t standard; 825 t normal; 864 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (287.62 ft / 278.87 ft) x 22.31 ft x (10.50 / 10.84 ft)
   (87.67 m / 85.00 m) x 6.80 m  x (3.20 / 3.30 m)

Armament:
      2 - 4.02" / 102 mm 45.0 cal guns - 32.66lbs / 14.81kg shells, 200 per gun
     Breech loading guns in deck mounts, 1920 Model
     2 x Single mounts on centreline, evenly spread
      6 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 8,000 per gun
     Machine guns in deck mounts, 1920 Model
     6 x Single mounts on sides, evenly spread
      Weight of broadside 66 lbs / 30 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.18" / 30 mm         -               -

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 23,577 shp / 17,588 Kw = 33.16 kts
   Range 2,600nm at 10.00 kts
   Bunker at max displacement = 87 tons (90% coal)

Complement:
   76 - 100

Cost:
   £0.219 million / $0.875 million

Distribution of weights at normal displacement:
   Armament: 11 tons, 1.3 %
      - Guns: 11 tons, 1.3 %
   Armour: 6 tons, 0.7 %
      - Armament: 6 tons, 0.7 %
   Machinery: 449 tons, 54.4 %
   Hull, fittings & equipment: 227 tons, 27.5 %
   Fuel, ammunition & stores: 75 tons, 9.1 %
   Miscellaneous weights: 57 tons, 6.9 %
      - Hull below water: 8 tons
      - Hull above water: 2 tons
      - On freeboard deck: 42 tons
      - Above deck: 5 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     185 lbs / 84 Kg = 5.7 x 4.0 " / 102 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.00
   Metacentric height 0.5 ft / 0.2 m
   Roll period: 12.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.26
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.442 / 0.448
   Length to Beam Ratio: 12.50 : 1
   'Natural speed' for length: 16.70 kts
   Power going to wave formation at top speed: 68 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 9.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  13.78 ft / 4.20 m,  12.47 ft / 3.80 m
      - Forward deck:   30.00 %,  12.47 ft / 3.80 m,  10.83 ft / 3.30 m
      - Aft deck:   35.00 %,  10.83 ft / 3.30 m,  10.83 ft / 3.30 m
      - Quarter deck:   15.00 %,  10.83 ft / 3.30 m,  10.83 ft / 3.30 m
      - Average freeboard:      11.51 ft / 3.51 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 181.9 %
      - Above water (accommodation/working, high = better): 110.7 %
   Waterplane Area: 3,943 Square feet or 366 Square metres
   Displacement factor (Displacement / loading): 44 %
   Structure weight / hull surface area: 24 lbs/sq ft or 119 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 2.48
      - Overall: 0.59
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

--36t = 6 x 2 TT, 21" swivel centreline
--1t = Fire Control
--8t = Night Vision Equipment
--5t hydrophones
--3t ASW
--6t = 30 x 195kg depth charges, inc. rails + gear
--2t = 2 x ASW Paravanes

[Khryses]

Based on some chats with Kirk, adding the Chao Phraya - a fast high-capacity MTB/DD tender capable of supporting the ships and crews of up to 9 DDs and up to 20 MTB-A (which are the only MTB the Thai support, sadly). Fortunately they also carry 20 MTB-A in a combat-launchable configuration as well as support, spare torpedo reloads and a long range radio. It displaces 5m, so should be able to operate up-river and in shallow waters while outrunning most of its likely opponents.

Technically I think it qualifies as a Merchant Auxiliary, which is useful for a Thai King on a budget.


Chao Phraya, Thai MTB/DD Tender Auxiliary laid down 1920

Displacement:
   8,978 t light; 9,184 t standard; 10,000 t normal; 10,653 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (426.51 ft / 426.51 ft) x 55.77 ft x (16.40 / 17.40 ft)
   (130.00 m / 130.00 m) x 17.00 m  x (5.00 / 5.30 m)

Armament:
      1 - 4.02" / 102 mm 45.0 cal gun - 32.66lbs / 14.81kg shells, 120 per gun
     Breech loading gun in deck mount, 1920 Model
     1 x Single mount on centreline, aft deck centre
      8 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 6,000 per gun
     Machine guns in deck mounts, 1920 Model
     8 x Single mounts on sides, evenly spread
      Weight of broadside 34 lbs / 15 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.18" / 30 mm         -               -

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 88,698 shp / 66,168 Kw = 29.40 kts
   Range 10,000nm at 10.00 kts
   Bunker at max displacement = 1,469 tons (90% coal)

Complement:
   499 - 650

Cost:
   £1.865 million / $7.460 million

Distribution of weights at normal displacement:
   Armament: 6 tons, 0.1 %
      - Guns: 6 tons, 0.1 %
   Armour: 3 tons, 0.0 %
      - Armament: 3 tons, 0.0 %
   Machinery: 3,378 tons, 33.8 %
   Hull, fittings & equipment: 2,794 tons, 27.9 %
   Fuel, ammunition & stores: 1,022 tons, 10.2 %
   Miscellaneous weights: 2,798 tons, 28.0 %
      - Hull below water: 720 tons
      - Hull above water: 478 tons
      - On freeboard deck: 1,600 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     9,372 lbs / 4,251 Kg = 289.4 x 4.0 " / 102 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.25
   Metacentric height 3.1 ft / 0.9 m
   Roll period: 13.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 49 %
         - Recoil effect (Restricted arc if above 1.00): 0.01
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.897 / 0.901
   Length to Beam Ratio: 7.65 : 1
   'Natural speed' for length: 20.65 kts
   Power going to wave formation at top speed: 71 %
   Trim (Max stability = 0, Max steadiness = 100): 49
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  26.25 ft / 8.00 m,  25.59 ft / 7.80 m
      - Forward deck:   30.00 %,  25.59 ft / 7.80 m,  22.97 ft / 7.00 m
      - Aft deck:   35.00 %,  22.97 ft / 7.00 m,  22.97 ft / 7.00 m
      - Quarter deck:   15.00 %,  22.97 ft / 7.00 m,  22.97 ft / 7.00 m
      - Average freeboard:      23.94 ft / 7.30 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 122.9 %
      - Above water (accommodation/working, high = better): 205.8 %
   Waterplane Area: 22,874 Square feet or 2,125 Square metres
   Displacement factor (Displacement / loading): 104 %
   Structure weight / hull surface area: 76 lbs/sq ft or 371 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.89
      - Longitudinal: 2.91
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room

--860t = DD/MTB support for 9 x 750t DDs + 20 MTBs
--38t = crew quarters for above (9 x 2t + 20 x 1t)
--200t = 100 x extra torpedos (no tubes, ammo only)
--1600t = 20 MTB-A in combat-launchable configuration
--25t = Long Range Wireless

[Khryses]

A shallow-bottomed minesweeper with a stern overhang to deploy paravanes and dragged booms from. The design aims to reduce the risk of contacting a mine itself with a draught of 0.8 m, accepting the strain of open sea transits as it's not designed for that or for combat (although retaining 1.01 seakeeping). 0.91 composite strength, which is a feature rather than a bug.

Kangkeng, Thai Minesweeper laid down 1920

Displacement:
   127 t light; 131 t standard; 142 t normal; 151 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (141.94 ft / 131.23 ft) x 26.25 ft x (2.62 / 2.76 ft)
   (43.26 m / 40.00 m) x 8.00 m  x (0.80 / 0.84 m)

Armament:
      4 - 0.59" / 15.0 mm 50.0 cal guns - 0.11lbs / 0.05kg shells, 2,000 per gun
     Machine guns in deck mounts, 1920 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 0 lbs / 0 kg

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 1 shaft, 661 shp / 493 Kw = 16.63 kts
   Range 2,000nm at 10.00 kts
   Bunker at max displacement = 20 tons

Complement:
   19 - 26

Cost:
   £0.018 million / $0.074 million

Distribution of weights at normal displacement:
   Armament: 0 tons, 0.2 %
      - Guns: 0 tons, 0.2 %
   Machinery: 23 tons, 16.3 %
   Hull, fittings & equipment: 71 tons, 50.0 %
   Fuel, ammunition & stores: 15 tons, 10.3 %
   Miscellaneous weights: 33 tons, 23.2 %
      - Hull below water: 20 tons
      - Hull above water: 6 tons
      - On freeboard deck: 5 tons
      - Above deck: 2 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     510 lbs / 231 Kg = 4,955.8 x 0.6 " / 15 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.61
   Metacentric height 1.5 ft / 0.5 m
   Roll period: 9.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.556
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 11.46 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: 9.84 ft / 3.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  9.84 ft / 3.00 m,  8.53 ft / 2.60 m
      - Forward deck:   30.00 %,  8.53 ft / 2.60 m,  7.55 ft / 2.30 m
      - Aft deck:   35.00 %,  7.55 ft / 2.30 m,  7.55 ft / 2.30 m
      - Quarter deck:   15.00 %,  7.55 ft / 2.30 m,  7.55 ft / 2.30 m
      - Average freeboard:      8.00 ft / 2.44 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 74.4 %
      - Above water (accommodation/working, high = better): 181.7 %
   Waterplane Area: 2,331 Square feet or 217 Square metres
   Displacement factor (Displacement / loading): 177 %
   Structure weight / hull surface area: 23 lbs/sq ft or 113 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.80
      - Longitudinal: 2.79
      - Overall: 0.91
   Caution: Hull subject to strain in open-sea
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room

--25t = full MSW suite
--8t = night-fighting (well, -sailing) equipment

[The Rock Doctor]

I'm skeptical of there being deck space for 20 MTB on that hull (high BC notwithstanding). 

Note that being capable of combat-launching would render the tender a warship cost-wise. 

On the other hand, I totally endorse the choice of high speed for the type.

[Jefgte]

I'm skeptical of there being deck space for 20 MTB on that hull (high BC notwithstanding).

Note that being capable of combat-launching would render the tender a warship cost-wise.

On the other hand, I totally endorse the choice of high speed for the type.

I agree totally with Rocky.

[Khryses]

I'm fine for us to change the rules-as-written to count combat launchable craft towards whether a unit is costed at mercantile or warship rates - that will cover aircraft carriers too, which will come up in the next decade or so.

I don't see any issues with fitting 20 MTB on her - I see a few configurations for this actually that could work. It wouldn't work as well if she was a 'MTB Carrier/Cruiser' with proper hull armament down her centreline but given she's essentially a glorified car ferry a high percentage of her deck space is available.

Does anyone have stats on the "MTB-A"? I know she has 40t displacement, main gun and the tubes etc but the only MTB with that displacement I can see seems to be Swedish in the 50s. Is there a historical vessel we're likening this to - either perfectly or "like X, but a little bigger"?

[Desertfox]

I think they are officially 20m long. I know you can stuff 10 MTB-As into a box that's 45m x 15m.

[Khryses]

I think they are officially 20m long. I know you can stuff 10 MTB-As into a box that's 45m x 15m.

I'm happy with that.

Let's assume a MTB-bay is 14m long then, perpendicular to the line of the ship and with 6m overhanging the side of the ship pointing outwards. There is a harness around the overhanging part of the ship to help keep her in her bay, while the centre of gravity rests on the hull of the Chao Phraya.

Looking at your notional box, let's assume the MTB-A is a bit under 5m across (proportional to the S-boot it would be 3.5m beam, but we can have this at 4.5 or therabouts). Give the MTB-bays 5.5m width each to allow for crane fittings, and we can stagger 20 of them easily up the length of the ship (ten per side) for a total of 110m of the ship's 130m length. Assume there's a catwalk that can rotate into place in sections when the MTBs aren't being deployed or recalled (to simplify traversal up and down the ship) and we still have plenty of room to fit in a conning tower and the single 4" gun facing aft.

An alternative could be to have some of the MTBs ready to launch and the rest stacked in a framework centreline to be physically lifted into the launch bays 4 at a time, but that feels less effective and less efficient than the above.

[Khryses]

I've updated the coastal battleship and Cruiser details, so with this post the Thai fleet is complete (on to the next fleet!).

The Minelayer - not especially fast compared to the other Thai ships, but able to drive on through the heaviest seas to lay mines around its coastline.


AM, Thai Minelayer laid down 1920

Displacement:
   523 t light; 548 t standard; 600 t normal; 642 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (175.15 ft / 164.04 ft) x 25.59 ft x (9.84 / 10.36 ft)
   (53.38 m / 50.00 m) x 7.80 m  x (3.00 / 3.16 m)

Armament:
      4 - 4.02" / 102 mm 45.0 cal guns - 32.66lbs / 14.81kg shells, 160 per gun
     Breech loading guns in deck and hoist mounts, 1920 Model
     2 x Twin mounts on centreline, forward evenly spread
      1 raised mount
      4 - 0.59" / 15.0 mm 90.0 cal guns - 0.12lbs / 0.05kg shells, 4,000 per gun
     Machine guns in deck mounts, 1920 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 131 lbs / 59 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.18" / 30 mm     85.73 ft / 26.13 m   5.94 ft / 1.81 m
   Ends:   1.18" / 30 mm     46.13 ft / 14.06 m   5.94 ft / 1.81 m
     32.19 ft / 9.81 m Unarmoured ends
   Upper:   1.18" / 30 mm     85.73 ft / 26.13 m   8.01 ft / 2.44 m
     Main Belt covers 80 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.94" / 100 mm   1.57" / 40 mm      3.94" / 100 mm

   - Conning towers: Forward 5.98" / 152 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 2,408 shp / 1,796 Kw = 17.57 kts
   Range 3,600nm at 10.00 kts
   Bunker at max displacement = 94 tons (90% coal)

Complement:
   59 - 78

Cost:
   £0.104 million / $0.416 million

Distribution of weights at normal displacement:
   Armament: 29 tons, 4.9 %
      - Guns: 29 tons, 4.9 %
   Armour: 110 tons, 18.3 %
      - Belts: 76 tons, 12.7 %
      - Armament: 24 tons, 4.1 %
      - Conning Tower: 9 tons, 1.5 %
   Machinery: 92 tons, 15.3 %
   Hull, fittings & equipment: 241 tons, 40.1 %
   Fuel, ammunition & stores: 77 tons, 12.9 %
   Miscellaneous weights: 51 tons, 8.5 %
      - Hull above water: 6 tons
      - On freeboard deck: 40 tons
      - Above deck: 5 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,011 lbs / 459 Kg = 31.2 x 4.0 " / 102 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.02
   Metacentric height 0.7 ft / 0.2 m
   Roll period: 13.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.80
   Seaboat quality  (Average = 1.00): 1.30

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.508 / 0.516
   Length to Beam Ratio: 6.41 : 1
   'Natural speed' for length: 12.81 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 39
   Bow angle (Positive = bow angles forward): 5.00 degrees
   Stern overhang: 9.84 ft / 3.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  14.44 ft / 4.40 m,  11.48 ft / 3.50 m
      - Forward deck:   30.00 %,  11.48 ft / 3.50 m,  10.50 ft / 3.20 m
      - Aft deck:   35.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   15.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      10.75 ft / 3.28 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 71.5 %
      - Above water (accommodation/working, high = better): 94.4 %
   Waterplane Area: 2,818 Square feet or 262 Square metres
   Displacement factor (Displacement / loading): 129 %
   Structure weight / hull surface area: 47 lbs/sq ft or 230 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.82
      - Longitudinal: 6.33
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Good seaboat, rides out heavy weather easily

-- 40t = 40 Reliable Horn Mines and rails on extended stern overhang
-- 3t = Fire Control
-- 8t = Night Operations Equipment