WesWorld

Gunboats

30x611 type RGB
24xMGB-404

subchasers

12xSC type 4
12xSC type 2

MTB's

20x Atlantean MTB-202 class
20x Atlantean MTB-82 class
20x Atlantean MTB-E1 type

20 CMB's (taken out of service, 20 additional units sold)

Armed Tug Jose Felix Ribas (taken out of service)

Motor launches
24 type 2 Motor launches (from Atlantis)

Coast guard vessels

18 type 1 motor launches purchased from Mexico in 1940
Motor launch Cauca (taken out of service)
Guarda Costa 1, 2, 3 and 4 (taken out of service)

Future project

Gunboats

Project 611, Argentina Light Patrol Craft laid down 1933


MGB-1 to 12 and 14 to 31
Displacement:
177 t light; 181 t standard; 192 t normal; 200 t full load

Dimensions: Length overall / water x beam x draught
149.13 ft / 144.36 ft x 21.33 ft x 5.74 ft (normal load)
45.46 m / 44.00 m x 6.50 m x 1.75 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 13.66lbs / 6.20kg shells, 1932 Model
Quick firing gun in deck mount
on centreline forward
4 - 0.79" / 20.0 mm guns (1x4 guns), 0.24lbs / 0.11kg shells, 1933 Model
Anti-aircraft guns in deck mount
on centreline aft
4 - 0.30" / 7.62 mm guns (2x2 guns), 0.02lbs / 0.01kg shells, 1933 Model
Machine guns in deck mounts
on side, all forward
Weight of broadside 15 lbs / 7 kg
Shells per gun, main battery: 80

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm - -

- Conning tower: 0.98" / 25 mm

Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 2,000 shp / 1,492 Kw = 21.18 kts
Range 1,500nm at 12.00 kts
Bunker at max displacement = 19 tons

Complement:
25 - 33

Cost:
£0.075 million / $0.299 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.9 %
Armour: 2 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.4 %
Machinery: 58 tons, 30.4 %
Hull, fittings & equipment: 104 tons, 54.3 %
Fuel, ammunition & stores: 15 tons, 7.8 %
Miscellaneous weights: 11 tons, 5.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
310 lbs / 141 Kg = 24.1 x 3.0 " / 75 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 0.6 ft / 0.2 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 1.14

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.380
Length to Beam Ratio: 6.77 : 1
'Natural speed' for length: 14.47 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 43
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13.12 ft / 4.00 m
- Forecastle (20 %): 10.50 ft / 3.20 m
- Mid (50 %): 9.35 ft / 2.85 m
- Quarterdeck (15 %): 9.35 ft / 2.85 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 9.88 ft / 3.01 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 111.7 %
- Above water (accommodation/working, high = better): 142.7 %
Waterplane Area: 1,947 Square feet or 181 Square metres
Displacement factor (Displacement / loading): 134 %
Structure weight / hull surface area: 27 lbs/sq ft or 134 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.79
- Longitudinal: 8.27
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent

MGB-408 (MTB-408 sub class), gunboat based variant of the Atlantean MTB-408 type, lacks torpedo's or depth charges of Atlantean design, weight of torpedo's and depth charges used for additional gun sheilding

20 boats ordered, first 8 built in 1945, additional 4 boats ordered in 1946

Demensions: 80.'9"x20',7"x25'
displacement: 50 tons
Armament: Two 40mm single mounts, two twin 50 cal. mg amidships aft of pilothouse, six single 50 cal. mg , one 60mm mortar, two Mk-1 eight cell 130mm rocket launchers
Crew Armament: Two Eleuthra Automatic Rifle (EAR) Mle.24A1, two Azeas Az34 sub machine guns, two Azeas-Petra AP carbine Mle.35A3
Machinery: 3x 1800 hp Roth-Packard liquid cooled engines
Speed: 40 knots
Crew: 17
Equipment: Radio, surface radar, radar based IFF, hydrophone, smoke apparatus

MTB's

20x Atlantean MTB-202 class

Demensions: 80.'3"x20',7"x5'
displacement: 50 tons
Armament: 2x20mm, 4x0.50 cal mg (2x2), 4x21"TT or 10 D.C.or 2x21" TT and 8 D.C.
Machinery: 3x 1500 hp Roth-Packard liquid cooled engines
Speed: 44 knots
Cruising radius: 1400 nm
Crew: 17
Equipment: Radio (W/T), hydrophone, smoke apparatus

20x Atlantean MTB-82 class
Demensions: 77'x19',11"x5',3"
displacement: 46 tons
Armament: 1x20mm, 4x0.50 cal mg (2x2), 4x21"TT or 10 D.C.or 2x21" TT and 8 D.C.
Machinery: 3x 1200 hp Roth-Packard liquid cooled engines
Speed: 41 knots
Cruising radius: 1400 nm
Crew: 17

20x Atlantean MTB-E1 type
Demensions: 70x19x5
displacement: 35 tons
Armament: 2x20mm, 4x0.50 cal mg, 4x18"TT, 6 D.C.
Machinery: 3x 1200 hp Roth-Packard liquid cooled engines
Speed: 41 knots
Cruising radius: 1200 nm

20x Atlantean Type 1 CMB
20 additional boats transfered to Poland via Atlantis in exchange for plans to build MTB-82 type

Demensions: 55x11x3
displacement:15 tons
Armament: 1x20mm forward, 2x0.50 cal mg aft of
bridge, 2x18"TT, 4 D.C.
Machinery: 2x 500 hp Roth petrol motor
Range: 100 nm @ 35 knots
Speed: 35 knots

20 additional boats transfered to Poland via Atlantis in exchange for plans to build MTB-82 type

Coast Guard vessels

Armed Tugs
Jose Felix Ribas
300 tons, 127x23x12, 2x6pdr, coal fired(78 tons), 10 knots, 1440 nm @10 knots, crew 44

Motor launches
Cauca
50 tons, 110x17x4, no guns presently, 12 knots

Guarda Costa 1, 2, 3 and 4
20 ton, 80x12.5x3.5, only Guarda Costa 3 armed with
1x1pdr, HP 160=12 knots, 2400nm @ 10 knots

Subchasers

SC type 4
Atlantean built, 12 vessels laid down 1935

Displacement:
106 t light; 111 t standard; 121 t normal; 128 t full load

Dimensions: Length overall / water x beam x draught
114.33 ft / 110.00 ft x 18.00 ft x 5.20 ft (normal load)
34.85 m / 33.53 m x 5.49 m x 1.58 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.88lbs / 5.84kg shells, 1935 Model
Quick firing gun in deck mount
on centreline forward
2 - 1.58" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.79" / 20.0 mm guns (1x4 guns), 0.24lbs / 0.11kg shells, 1935 Model
Anti-aircraft guns in deck mount
on side
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1935 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 18 lbs / 8 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,149 shp / 857 Kw = 18.00 kts
Range 1,500nm at 12.00 kts
Bunker at max displacement = 17 tons

Complement:
17 - 23

Cost:
£0.052 million / $0.207 million

Distribution of weights at normal displacement:
Armament: 2 tons, 1.9 %
Armour: 1 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 33 tons, 27.1 %
Hull, fittings & equipment: 58 tons, 47.8 %
Fuel, ammunition & stores: 15 tons, 12.3 %
Miscellaneous weights: 12 tons, 9.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
156 lbs / 71 Kg = 12.1 x 3.0 " / 75 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 0.5 ft / 0.1 m
Roll period: 10.9 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.14
Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.410
Length to Beam Ratio: 6.11 : 1
'Natural speed' for length: 10.49 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11.90 ft / 3.63 m
- Forecastle (20 %): 7.51 ft / 2.29 m
- Mid (50 %): 7.51 ft / 2.29 m
- Quarterdeck (15 %): 7.51 ft / 2.29 m
- Stern: 7.51 ft / 2.29 m
- Average freeboard: 7.86 ft / 2.40 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 114.6 %
- Above water (accommodation/working, high = better): 103.2 %
Waterplane Area: 1,226 Square feet or 114 Square metres
Displacement factor (Displacement / loading): 125 %
Structure weight / hull surface area: 24 lbs/sq ft or 120 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.82
- Longitudinal: 8.05
- Overall: 1.04
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate


SC type 2
Atlantean built, 12 vessels laid down 1919, purchased 1935

Displacement:
109 t light; 113 t standard; 121 t normal; 127 t full load

Dimensions: Length overall / water x beam x draught
110.00 ft / 110.00 ft x 15.00 ft x 4.50 ft (normal load)
33.53 m / 33.53 m x 4.57 m x 1.37 m

Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1919 Model
Breech loading gun in deck mount
on centreline forward
1 - 1.58" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1919 Model
Breech loading gun in deck mount
on side amidships
4 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1919 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 150

Machinery:
Petrol Internal combustion motors,
Direct drive, 1 shaft, 1,239 shp / 924 Kw = 18.00 kts
Range 1,000nm at 12.00 kts
Bunker at max displacement = 14 tons

Complement:
17 - 23

Cost:
£0.026 million / $0.103 million

Distribution of weights at normal displacement:
Armament: 2 tons, 1.8 %
Machinery: 44 tons, 36.4 %
Hull, fittings & equipment: 53 tons, 43.5 %
Fuel, ammunition & stores: 12 tons, 10.0 %
Miscellaneous weights: 10 tons, 8.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
88 lbs / 40 Kg = 6.5 x 3.0 " / 76 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.3 ft / 0.1 m
Roll period: 10.7 seconds
Steadiness - As gun platform (Average = 50 %): 45 %
- Recoil effect (Restricted arc if above 1.00): 0.20
Seaboat quality (Average = 1.00): 0.69

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.570
Length to Beam Ratio: 7.33 : 1
'Natural speed' for length: 10.49 kts
Power going to wave formation at top speed: 72 %
Trim (Max stability = 0, Max steadiness = 100): 60
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: 7.00 ft / 2.13 m
- Forecastle (20 %): 6.50 ft / 1.98 m
- Mid (50 %): 6.50 ft / 1.98 m
- Quarterdeck (15 %): 6.50 ft / 1.98 m
- Stern: 6.50 ft / 1.98 m
- Average freeboard: 6.54 ft / 1.99 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 140.8 %
- Above water (accommodation/working, high = better): 83.2 %
Waterplane Area: 1,142 Square feet or 106 Square metres
Displacement factor (Displacement / loading): 105 %
Structure weight / hull surface area: 25 lbs/sq ft or 120 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 5.20
- Overall: 1.15
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Caution: Lacks seaworthiness - very limited seakeeping ability