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