WesWorld

Chaco Class



Minelayer/ Minesweeper
ARA Chaco
ARA Chubut
ARA Neuquen
ARA Rio Negro
ARA Colorado
ARA Tierra del Fuego

Anti-Aircraft Escort (from 1944 all AA and A/S escorts are refitted to a common standard - see below)
ARA Chico
ARA Desepuadero
ARA Magellan
ARA Fuego

Anti-Submarine Escort (from 1944 all AA and A/S escorts are refitted to a common standard - see below)
ARA Pilcomayo
ARA Verde
ARA Heras
ARA Gallegos,

Chaco Class, Argentina Minelayer/ Minesweeper laid down 1932

Displacement:
315 t light; 327 t standard; 359 t normal; 384 t full load

Dimensions: Length overall / water x beam x draught
176.57 ft / 170.60 ft x 22.97 ft x 6.23 ft (normal load)
53.82 m / 52.00 m x 7.00 m x 1.90 m

Armament:
2 - 3.94" / 100 mm guns in single mounts, 28.66lbs / 13.00kg shells, 1932 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread, 1 raised mount
5 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side ends, majority forward
Weight of broadside 59 lbs / 27 kg
Shells per gun, main battery: 150

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

- Conning tower: 1.97" / 50 mm

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 1,000 shp / 746 Kw = 15.43 kts
Range 4,500nm at 10.00 kts
Bunker at max displacement = 57 tons

Complement:
40 - 53

Cost:
£0.099 million / $0.394 million

Distribution of weights at normal displacement:
Armament: 8 tons, 2.2 %
Armour: 5 tons, 1.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.9 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.6 %
Machinery: 30 tons, 8.2 %
Hull, fittings & equipment: 162 tons, 45.2 %
Fuel, ammunition & stores: 44 tons, 12.3 %
Miscellaneous weights: 110 tons, 30.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
787 lbs / 357 Kg = 25.8 x 3.9 " / 100 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.04
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.28
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.514
Length to Beam Ratio: 7.43 : 1
'Natural speed' for length: 13.06 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 30
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: 16.40 ft / 5.00 m
- Forecastle (14 %): 16.40 ft / 5.00 m
- Mid (40 %): 16.40 ft / 5.00 m (7.55 ft / 2.30 m aft of break)
- Quarterdeck (20 %): 7.55 ft / 2.30 m
- Stern: 7.55 ft / 2.30 m
- Average freeboard: 11.09 ft / 3.38 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77.3 %
- Above water (accommodation/working, high = better): 139.0 %
Waterplane Area: 2,644 Square feet or 246 Square metres
Displacement factor (Displacement / loading): 152 %
Structure weight / hull surface area: 30 lbs/sq ft or 148 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.81
- Longitudinal: 6.52
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather


1944 Escort Refit
Chaco Class, Argentina Minelayer/ Minesweeper laid down 1932

Displacement:
309 t light; 327 t standard; 359 t normal; 384 t full load

Dimensions: Length overall / water x beam x draught
176.57 ft / 170.60 ft x 22.97 ft x 6.23 ft (normal load)
53.82 m / 52.00 m x 7.00 m x 1.90 m

Armament:
2 - 4.53" / 115 mm guns (1x2 guns), 55.12lbs / 25.00kg shells, 1932 Model
Dual purpose guns in deck mount
on centreline forward
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, all aft, all raised mounts - superfiring
Weight of broadside 117 lbs / 53 kg
Shells per gun, main battery: 150

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

- Conning tower: 1.97" / 50 mm

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 1,000 shp / 746 Kw = 15.43 kts
Range 4,500nm at 10.00 kts
Bunker at max displacement = 57 tons

Complement:
40 - 53

Cost:
£0.116 million / $0.463 million

Distribution of weights at normal displacement:
Armament: 12 tons, 3.5 %
Armour: 6 tons, 1.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 4 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.6 %
Machinery: 30 tons, 8.2 %
Hull, fittings & equipment: 172 tons, 47.9 %
Fuel, ammunition & stores: 49 tons, 13.7 %
Miscellaneous weights: 90 tons, 25.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
752 lbs / 341 Kg = 16.2 x 4.5 " / 115 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.49
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.514
Length to Beam Ratio: 7.43 : 1
'Natural speed' for length: 13.06 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 30
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: 16.40 ft / 5.00 m
- Forecastle (14 %): 16.40 ft / 5.00 m
- Mid (40 %): 16.40 ft / 5.00 m (7.55 ft / 2.30 m aft of break)
- Quarterdeck (20 %): 7.55 ft / 2.30 m
- Stern: 7.55 ft / 2.30 m
- Average freeboard: 11.09 ft / 3.38 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 81.8 %
- Above water (accommodation/working, high = better): 139.0 %
Waterplane Area: 2,644 Square feet or 246 Square metres
Displacement factor (Displacement / loading): 141 %
Structure weight / hull surface area: 32 lbs/sq ft or 157 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.81
- Longitudinal: 6.74
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

A/S and AA Escort Refit
Conversion into multi-role escorts
New armament as above
Addition of ASDIC
2x DCR and 4x DCT for 60x DCs


*****



ARA Guardia
ARA Republica
ARA Prefecto Derbes
ARA Mantila
ARA Azopardo
[Constitucion, Prefecto Pique and Presidente Gomez all war losses]

Guardia Class, Argentina Patrol/Minesweeper laid down 1932

Displacement:
618 t light; 635 t standard; 687 t normal; 728 t full load

Dimensions: Length overall / water x beam x draught
224.65 ft / 219.82 ft x 34.45 ft x 7.74 ft (normal load)
68.47 m / 67.00 m x 10.50 m x 2.36 m

Armament:
1 - 3.94" / 100 mm guns in single mounts, 28.66lbs / 13.00kg shells, 1932 Model
Quick firing gun in deck mount
on centreline forward
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1932 Model
Anti-aircraft guns in deck mount
on centreline aft
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 32 lbs / 15 kg
Shells per gun, main battery: 180

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

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 2,715 ihp / 2,025 Kw = 18.52 kts
Range 2,500nm at 12.00 kts
Bunker at max displacement = 93 tons

Complement:
66 - 87

Cost:
£0.212 million / $0.849 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.6 %
Armour: 2 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 153 tons, 22.3 %
Hull, fittings & equipment: 339 tons, 49.3 %
Fuel, ammunition & stores: 69 tons, 10.0 %
Miscellaneous weights: 120 tons, 17.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,605 lbs / 728 Kg = 52.6 x 3.9 " / 100 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.27
Metacentric height 1.6 ft / 0.5 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.410
Length to Beam Ratio: 6.38 : 1
'Natural speed' for length: 14.83 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.04 ft / 5.50 m
- Forecastle (15 %): 16.40 ft / 5.00 m
- Mid (70 %): 16.40 ft / 5.00 m
- Quarterdeck (18 %): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 14.14 ft / 4.31 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 96.7 %
- Above water (accommodation/working, high = better): 210.1 %
Waterplane Area: 4,689 Square feet or 436 Square metres
Displacement factor (Displacement / loading): 149 %
Structure weight / hull surface area: 41 lbs/sq ft or 202 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.82
- Longitudinal: 5.46
- 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

Ex-German Typ M1 Raumboot-37
16 brought Q1/43 and commissioned as ARA MS1-MS16
12 brought Q1/45 and commissioned as ARA MS17-MS28

Built: 1937
Size (Max): 125 t
Size (light): 92t
Length (Total): 37.8 m
Length (Waterline): 36.2m
Beam: 5.75 m
Draft: 1.6m
Crew: 28-44
Weapons
2 cm MG: 1
3.7cm cannon: 1
Machine Guns: 2
Mines: Up to 4.
Engines
Shafts: 2
Engines: 2
Type: MAN 8-cyl diesel engines
Performance
Total Performance: 1800 shp
Speed: 19.5 kts
Range: 1300 miles at 15 kn

Project 706D Piedra Buena, Argentina Patrol Icebreaker laid down 1940

Displacement:
4,731 t light; 4,856 t standard; 5,878 t normal; 6,695 t full load

Dimensions: Length overall / water x beam x draught
359.76 ft / 357.61 ft x 65.62 ft x 20.34 ft (normal load)
109.66 m / 109.00 m x 20.00 m x 6.20 m

Armament:
2 - 3.94" / 100 mm guns (1x2 guns), 30.42lbs / 13.80kg shells, 1933 Model
Quick firing guns in deck mount
on centreline forward
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
2 - 0.30" / 7.6 mm guns in single mounts, 0.01lbs / 0.00kg shells, 1940 Model
Machine guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 67 lbs / 30 kg
Shells per gun, main battery: 175

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.97" / 50 mm 214.57 ft / 65.40 m 22.97 ft / 7.00 m
Ends: 1.97" / 50 mm 143.04 ft / 43.60 m 22.97 ft / 7.00 m
Main Belt covers 92 % of normal length

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

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 8,000 shp / 5,968 Kw = 18.08 kts
Range 12,000nm at 15.00 kts
Bunker at max displacement = 1,839 tons

Complement:
335 - 436

Cost:
£1.216 million / $4.863 million

Distribution of weights at normal displacement:
Armament: 8 tons, 0.1 %
Armour: 675 tons, 11.5 %
- Belts: 672 tons, 11.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 214 tons, 3.6 %
Hull, fittings & equipment: 2,109 tons, 35.9 %
Fuel, ammunition & stores: 1,146 tons, 19.5 %
Miscellaneous weights: 1,725 tons, 29.3 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
15,161 lbs / 6,877 Kg = 496.9 x 3.9 " / 100 mm shells or 3.5 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 3.5 ft / 1.1 m
Roll period: 14.8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.431
Length to Beam Ratio: 5.45 : 1
'Natural speed' for length: 18.91 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (22 %): 22.97 ft / 7.00 m
- Mid (45 %): 22.97 ft / 7.00 m (13.12 ft / 4.00 m aft of break)
- Quarterdeck (18 %): 13.12 ft / 4.00 m
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 17.70 ft / 5.39 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 46.1 %
- Above water (accommodation/working, high = better): 141.7 %
Waterplane Area: 14,746 Square feet or 1,370 Square metres
Displacement factor (Displacement / loading): 203 %
Structure weight / hull surface area: 95 lbs/sq ft or 462 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.13
- Longitudinal: 3.07
- Overall: 1.25
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Misc Weight includes provision for catapult and one seaplane
1,600 tons is cargo capacity

Project 621 Class, Argentina Coastal Minesweeper laid down 1946

ARA Calchaqui, Capayan, Chiquillan, Chulupi, Mocovi, Morloyan

Displacement:
476 t light; 493 t standard; 571 t normal; 634 t full load

Dimensions: Length overall / water x beam x draught
216.44 ft / 213.25 ft x 27.89 ft x 8.20 ft (normal load)
65.97 m / 65.00 m x 8.50 m x 2.50 m

Armament:
1 - 3.94" / 100 mm guns in single mounts, 30.42lbs / 13.80kg shells, 1933 Model
Dual purpose gun in deck mount
on centreline forward
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, 1 raised mount
4 - 0.52" / 13.2 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1933 Model
Machine guns in deck mounts
on side ends, evenly spread, 2 raised mounts - superfiring
Weight of broadside 37 lbs / 17 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.59" / 15 mm - -
3rd: 0.39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,100 shp / 820 Kw = 15.14 kts
Range 6,500nm at 12.00 kts
Bunker at max displacement = 141 tons

Complement:
57 - 75

Cost:
£0.173 million / $0.691 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.8 %
Armour: 3 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 27 tons, 4.8 %
Hull, fittings & equipment: 261 tons, 45.7 %
Fuel, ammunition & stores: 96 tons, 16.7 %
Miscellaneous weights: 180 tons, 31.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,701 lbs / 772 Kg = 55.8 x 3.9 " / 100 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 0.8 ft / 0.3 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.410
Length to Beam Ratio: 7.65 : 1
'Natural speed' for length: 14.60 kts
Power going to wave formation at top speed: 42 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.04 ft / 5.50 m
- Forecastle (20 %): 16.40 ft / 5.00 m
- Mid (45 %): 16.40 ft / 5.00 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (20 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 12.93 ft / 3.94 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 57.6 %
- Above water (accommodation/working, high = better): 154.8 %
Waterplane Area: 3,683 Square feet or 342 Square metres
Displacement factor (Displacement / loading): 208 %
Structure weight / hull surface area: 35 lbs/sq ft or 170 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.82
- Longitudinal: 5.81
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Class Names: ARA Calchaqui, Capayan, Chiquillan, Chulupi, Mocovi, Morloyan