WesWorld

Bumroong Boonyuen-class
Bumroong Boonyuen
Pacheun Trongsawasdi
Witchaya Riddhidej
Porntep Bunraksa
Surawit Choungjamnongjit
Songkarm Rahoung
Nuchachart Hasunha
Pornarong Amornpinij

[SIZE=1]sim by Commodore Green[/SIZE]

Siamese Bumroong Boonyuen-class Patrol Boat laid down 1930

Displacement:
340 t light; 352 t standard; 400 t normal; 438 t full load

Dimensions: Length overall / water x beam x draught
185.66 ft / 175.00 ft x 25.00 ft x 7.00 ft (normal load)
56.59 m / 53.34 m x 7.62 m x 2.13 m

Armament:
2 - 3.94" / 100 mm guns in single mounts, 30.51lbs / 13.84kg shells, 1930 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 1 raised mount
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1930 Model
Breech loading guns in deck mounts
on side, all amidships
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1930 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 68 lbs / 31 kg
Shells per gun, main battery: 100

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.59" / 15 mm -
2nd: 0.59" / 15 mm 0.59" / 15 mm -
3rd: 0.59" / 15 mm 0.59" / 15 mm -

- Conning tower: 1.18" / 30 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2,985 shp / 2,227 Kw = 20.00 kts
Range 4,000nm at 12.00 kts
Bunker at max displacement = 85 tons

Complement:
44 - 58

Cost:
£0.133 million / $0.531 million

Distribution of weights at normal displacement:
Armament: 9 tons, 2.1 %
Armour: 9 tons, 2.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 7 tons, 1.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 90 tons, 22.6 %
Hull, fittings & equipment: 198 tons, 49.4 %
Fuel, ammunition & stores: 59 tons, 14.9 %
Miscellaneous weights: 35 tons, 8.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
656 lbs / 298 Kg = 21.5 x 3.9 " / 100 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.38
Seaboat quality (Average = 1.00): 1.22

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.457
Length to Beam Ratio: 7.00 : 1
'Natural speed' for length: 13.23 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 47
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15.00 ft / 4.57 m
- Forecastle (20 %): 14.00 ft / 4.27 m
- Mid (60 %): 14.00 ft / 4.27 m (5.00 ft / 1.52 m aft of break)
- Quarterdeck (15 %): 5.00 ft / 1.52 m
- Stern: 5.00 ft / 1.52 m
- Average freeboard: 10.48 ft / 3.19 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 99.2 %
- Above water (accommodation/working, high = better): 128.1 %
Waterplane Area: 2,807 Square feet or 261 Square metres
Displacement factor (Displacement / loading): 137 %
Structure weight / hull surface area: 38 lbs/sq ft or 188 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 5.18
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Slightly larger versions of the previous Bumroong Boonyuen class with more reliable diesels, primitive hydrophones based on Dutch designs and 3 depth charge rails (2 drop off the beams aft the lifeboats and 1 off the stern) with 45 depth charges.



Ko Phuket, Siamese Patrol Boat laid down 1936

Displacement:
350 t light; 369 t standard; 414 t normal; 450 t full load

Dimensions: Length overall / water x beam x draught
183.72 ft / 173.88 ft x 24.61 ft x 8.20 ft (normal load)
56.00 m / 53.00 m x 7.50 m x 2.50 m

Armament:
2 - 3.94" / 100 mm guns in single mounts, 33.07lbs / 15.00kg shells, 1936 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.65lbs / 0.75kg shells, 1936 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread, 1 raised mount
6 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1936 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 73 lbs / 33 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - 1.57" / 40 mm
2nd: 0.98" / 25 mm - -

- Conning tower: 1.57" / 40 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 3,000 shp / 2,238 Kw = 20.05 kts
Range 4,000nm at 12.00 kts
Bunker at max displacement = 81 tons

Complement:
45 - 59

Cost:
£0.164 million / $0.656 million

Distribution of weights at normal displacement:
Armament: 8 tons, 2.0 %
Armour: 11 tons, 2.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 9 tons, 2.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.5 %
Machinery: 84 tons, 20.3 %
Hull, fittings & equipment: 214 tons, 51.7 %
Fuel, ammunition & stores: 64 tons, 15.6 %
Miscellaneous weights: 32 tons, 7.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
740 lbs / 336 Kg = 24.3 x 3.9 " / 100 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 0.8 ft / 0.2 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.39
Seaboat quality (Average = 1.00): 1.67

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.413
Length to Beam Ratio: 7.07 : 1
'Natural speed' for length: 13.19 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 30
Bow angle (Positive = bow angles forward): 17.50 degrees
Stern overhang: 4.92 ft / 1.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15.58 ft / 4.75 m
- Forecastle (20 %): 12.30 ft / 3.75 m
- Mid (50 %): 11.48 ft / 3.50 m
- Quarterdeck (15 %): 10.66 ft / 3.25 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 11.70 ft / 3.57 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 91.9 %
- Above water (accommodation/working, high = better): 128.7 %
Waterplane Area: 2,655 Square feet or 247 Square metres
Displacement factor (Displacement / loading): 148 %
Structure weight / hull surface area: 38 lbs/sq ft or 185 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.79
- Longitudinal: 8.45
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

32t - Misc. Weight
-------------------------
15t - Hydrophone array
15t - Depth charges
2t - (empty)


Laid Down JAN 36
Ko Phuket
Ko Chang
Ko Pha Ngan
Ko Tarutao

During 1936 several ex-dutchl Putten class patrol boats joined the Siamese navy.

RSN Bendang (Ex-dutch Putten class)
RSN Laksamana (Ex-dutch Putten class)
RSN Along (Ex-dutch Putten class)
RSN Tengku (Ex-dutch Putten class)
RSN Datok (Ex-dutch Putten class)
RSN Nai Jayam (Ex-dutch Putten class)
RSN Ananda (Ex-dutch Putten class)
RSN Bhumibol (Ex-dutch Putten class)

Bendang , Siamese Patrol Corvette laid down 1930

Displacement:
74 t light; 77 t standard; 81 t normal; 84 t full load

Dimensions: Length overall / water x beam x draught
81.94 ft / 75.46 ft x 15.09 ft x 4.10 ft (normal load)
24.97 m / 23.00 m x 4.60 m x 1.25 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1928 Model
Dual purpose gun in deck mount
on centreline forward
1 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.88kg shells, 1924 Model
Dual purpose gun in deck mount
on centreline aft, 1 raised gun
4 - 0.52" / 13.2 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1928 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 15 lbs / 7 kg
Shells per gun, main battery: 200

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0.51" / 13 mm 49.21 ft / 15.00 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 100 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm - -
2nd: 0.59" / 15 mm - -

- Armour deck: 0.24" / 6 mm, Conning tower: 0.59" / 15 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 254 shp / 189 Kw = 13.00 kts
Range 2,000nm at 8.00 kts
Bunker at max displacement = 7 tons

Complement:
13 - 17

Cost:
£0.022 million / $0.088 million

Distribution of weights at normal displacement:
Armament: 2 tons, 2.3 %
Armour: 17 tons, 20.4 %
- Belts: 11 tons, 13.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 1.6 %
- Armour Deck: 4 tons, 4.7 %
- Conning Tower: 0 tons, 0.3 %
Machinery: 8 tons, 9.5 %
Hull, fittings & equipment: 33 tons, 40.5 %
Fuel, ammunition & stores: 7 tons, 8.8 %
Miscellaneous weights: 15 tons, 18.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
174 lbs / 79 Kg = 13.5 x 3.0 " / 75 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.3 ft / 0.1 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 62 %
- Recoil effect (Restricted arc if above 1.00): 0.24
Seaboat quality (Average = 1.00): 1.24

Hull form characteristics:
Hull has raised forecastle
and transom stern
Block coefficient: 0.607
Length to Beam Ratio: 5.00 : 1
'Natural speed' for length: 10.41 kts
Power going to wave formation at top speed: 71 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 9.84 ft / 3.00 m
- Forecastle (20 %): 9.84 ft / 3.00 m (6.56 ft / 2.00 m aft of break)
- Mid (50 %): 6.56 ft / 2.00 m
- Quarterdeck (15 %): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 7.22 ft / 2.20 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 70.5 %
- Above water (accommodation/working, high = better): 84.0 %
Waterplane Area: 874 Square feet or 81 Square metres
Displacement factor (Displacement / loading): 131 %
Structure weight / hull surface area: 20 lbs/sq ft or 98 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 12.33
- Overall: 1.09
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Good seaboat, rides out heavy weather easily


Wooden (teak) construction, armor is exterior as in old ironclads and intended to thwart anti-personal fire from river banks/pirates/etc.

During 1936 six ex-australian patrol cutters joined the Siamese navy.

RSN Manopakornnitithada (Ex-australian patrol cutter)
RSN Phaholphonphayuhasena (Ex-australian patrol cutter)
RSN Pibulsongkram (Ex-australian patrol cutter)
RSN Aphaiwong (Ex-australian patrol cutter)
RSN Bunyaket (Ex-australian patrol cutter)
RSN Pramoj (Ex-australian patrol cutter)

Displacement:
549 t light; 570 t standard; 704 t normal; 810 t full load

Dimensions: Length overall / water x beam x draught
270.00 ft / 270.00 ft x 24.00 ft x 9.50 ft (normal load)
82.30 m / 82.30 m x 7.32 m x 2.90 m

Armament:
3 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1931 Model
Breech loading guns in deck mounts
on centreline ends, majority forward, 1 raised mount
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1931 Model
Breech loading guns in deck mounts
on centreline, evenly spread
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1931 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 105 lbs / 48 kg
Shells per gun, main battery: 120
4 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.20" / 30 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 12,267 shp / 9,151 Kw = 29.00 kts
Range 9,000nm at 12.00 kts
Bunker at max displacement = 240 tons

Complement:
67 - 88

Cost:
£0.321 million / $1.285 million

Distribution of weights at normal displacement:
Armament: 13 tons, 1.9 %
Armour: 8 tons, 1.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 8 tons, 1.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 310 tons, 44.0 %
Hull, fittings & equipment: 208 tons, 29.6 %
Fuel, ammunition & stores: 155 tons, 22.0 %
Miscellaneous weights: 10 tons, 1.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
277 lbs / 126 Kg = 8.6 x 4.0 " / 102 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.38
Metacentric height 1.0 ft / 0.3 m
Roll period: 9.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.27
Seaboat quality (Average = 1.00): 1.25

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 11.25 : 1
'Natural speed' for length: 18.82 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 56
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: 15.00 ft / 4.57 m
- Forecastle (20 %): 11.00 ft / 3.35 m
- Mid (50 %): 11.00 ft / 3.35 m
- Quarterdeck (15 %): 11.00 ft / 3.35 m
- Stern: 11.00 ft / 3.35 m
- Average freeboard: 11.32 ft / 3.45 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 158.0 %
- Above water (accommodation/working, high = better): 74.4 %
Waterplane Area: 4,140 Square feet or 385 Square metres
Displacement factor (Displacement / loading): 82 %
Structure weight / hull surface area: 24 lbs/sq ft or 115 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 2.23
- Overall: 0.59
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily