Quoted
Astraea and Antrim, Atlantean Light Cruiser laid down 1915
Displacement:
7,251 t light; 7,479 t standard; 8,015 t normal; 8,444 t full load
Dimensions: Length overall / water x beam x draught
578.88 ft / 575.00 ft x 56.00 ft x 18.00 ft (normal load)
176.44 m / 175.26 m x 17.07 m x 5.49 m
Armament:
4 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1915 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread, 1 raised mount
4 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1915 Model
Breech loading guns in deck mounts
on side, all amidships
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1915 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
8 - 1.00" / 25.4 mm guns in single mounts, 0.50lbs / 0.23kg shells, 1915 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 724 lbs / 328 kg
Shells per gun, main battery: 150
8 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 410.00 ft / 124.97 m 12.00 ft / 3.66 m
Ends: 1.50" / 38 mm 160.00 ft / 48.77 m 8.00 ft / 2.44 m
5.00 ft / 1.52 m Unarmoured ends
Upper: 0.78" / 20 mm 200.00 ft / 60.96 m 0.00 ft / 0.00 m
Main Belt covers 110 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm - -
- Armour deck: 1.18" / 30 mm, Conning tower: 5.90" / 150 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 64,871 shp / 48,394 Kw = 31.00 kts
Range 5,600nm at 12.00 kts
Bunker at max displacement = 965 tons
Complement:
423 - 550
Cost:
£0.980 million / $3.920 million
Distribution of weights at normal displacement:
Armament: 90 tons, 1.1 %
Armour: 1,238 tons, 15.4 %
- Belts: 705 tons, 8.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 20 tons, 0.2 %
- Armour Deck: 462 tons, 5.8 %
- Conning Tower: 51 tons, 0.6 %
Machinery: 2,457 tons, 30.7 %
Hull, fittings & equipment: 3,416 tons, 42.6 %
Fuel, ammunition & stores: 764 tons, 9.5 %
Miscellaneous weights: 50 tons, 0.6 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
8,625 lbs / 3,912 Kg = 103.7 x 5.5 " / 140 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.27
Metacentric height 3.2 ft / 1.0 m
Roll period: 13.1 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.10
Seaboat quality (Average = 1.00): 1.10
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.484
Length to Beam Ratio: 10.27 : 1
'Natural speed' for length: 23.98 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 64
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: 22.00 ft / 6.71 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (65 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 16.66 ft / 5.08 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 109.2 %
- Above water (accommodation/working, high = better): 133.6 %
Waterplane Area: 21,147 Square feet or 1,965 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 104 lbs/sq ft or 508 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.25
- Longitudinal: 1.28
- Overall: 1.25
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
---------------------------------------------------
Astraea-class, Atlantean/Chilean Light Antiaircraft Cruiser laid down 1915, Rebuilt 1937
Displacement:
6,961 t light; 7,374 t standard; 8,015 t normal; 8,528 t full load
Dimensions: Length overall / water x beam x raught
579.23 ft / 575.00 ft x 56.00 ft x 18.00 ft (normal load)
176.55 m / 175.26 m x 17.07 m x 5.49 m
Armament:
8 - 5.12" / 130 mm guns (4x2 guns), 67.03lbs / 30.40kg shells, 1937 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 5.12" / 130 mm guns (4x2 guns), 67.03lbs / 30.40kg shells, 1937 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships
12 - 1.46" / 37.0 mm guns (6x2 guns), 1.55lbs / 0.70kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
12 - 0.79" / 20.0 mm guns (6x2 guns), 0.24lbs / 0.11kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 1,094 lbs / 496 kg
Shells per gun, main battery: 375
12 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.15" / 80 mm 430.00 ft / 131.06 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 115 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.57" / 40 mm 0.79" / 20 mm 1.18" / 30 mm
2nd: 1.57" / 40 mm 0.79" / 20 mm 1.18" / 30 mm
3rd: 0.59" / 15 mm - -
4th: 0.59" / 15 mm - -
- Armour deck: 1.18" / 30 mm, Conning tower: 5.91" / 150 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 83,485 shp / 62,280 Kw = 33.00 kts
Range 5,950nm at 15.00 kts
Bunker at max displacement = 1,153 tons
Complement:
423 - 550
Cost:
£0.993 million / $3.971 million
Distribution of weights at normal displacement:
Armament: 137 tons, 1.7 %
Armour: 1,237 tons, 15.4 %
- Belts: 661 tons, 8.2 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 64 tons, 0.8 %
- Armour Deck: 462 tons, 5.8 %
- Conning Tower: 51 tons, 0.6 %
Machinery: 2,314 tons, 28.9 %
Hull, fittings & equipment: 3,173 tons, 39.6 %
Fuel, ammunition & stores: 1,054 tons, 13.2 %
Miscellaneous weights: 100 tons, 1.2 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
8,381 lbs / 3,802 Kg = 125.0 x 5.1 " / 130 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 2.7 ft / 0.8 m
Roll period: 14.4 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.39
Seaboat quality (Average = 1.00): 1.04
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.484
Length to Beam Ratio: 10.27 : 1
'Natural speed' for length: 23.98 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 68
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: 24.00 ft / 7.32 m
- Forecastle (20 %): 21.00 ft / 6.40 m
- Mid (65 %): 21.00 ft / 6.40 m (13.00 ft / 3.96 m aft of break)
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 18.44 ft / 5.62 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 110.6 %
- Above water (accommodation/working, high = better): 131.2 %
Waterplane Area: 21,147 Square feet or 1,965 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 94 lbs/sq ft or 459 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.27
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Breakdown of Excess Weights:
Air search radar - 20 tons
Surface search radar - 20 tons
Extra AA ammo - 20 tons
Air conditioning/Heating - 5 tons
Torpedo reloads - 30 tons
Crew comforts - 5 tons
Electronics:
- 1x YPSBM (Atlantean) Surface Search Y-Range. Designation name "Mainsail."
- 1x YPTBM (Atlantean) Air Search Y-Range. Designation name "Moonraker."
Ships in Class:
- Astraea (CL-10) - 1915/1937
- Tierra del Fuego (CL-11) - 1915/1937
Quoted
Alphabet Destroyer C-class, Atlantean-built Chilean Destroyer laid down 1917 (Engine 1938)
Rebuilt as Destroyer-Escort+Minesweeper in 1938
Displacement:
1,195 t light; 1,244 t standard; 1,389 t normal; 1,505 t full load
Dimensions: Length overall / water x beam x draught
330.63 ft / 325.00 ft x 32.00 ft x 11.00 ft (normal load)
100.78 m / 99.06 m x 9.75 m x 3.35 m
Armament:
3 - 4.33" / 110 mm guns in single mounts, 40.61lbs / 18.42kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount
2 - 1.57" / 40.0 mm guns (1x2 guns), 1.95lbs / 0.88kg shells, 1938 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1917 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 127 lbs / 57 kg
Shells per gun, main battery: 300
4 - 21.0" / 533.4 mm above water torpedoes
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 36,005 shp / 26,860 Kw = 33.00 kts
Range 5,000nm at 13.50 kts
Bunker at max displacement = 261 tons
Complement:
113 - 147
Cost:
£0.284 million / $1.135 million
Distribution of weights at normal displacement:
Armament: 16 tons, 1.1 %
Machinery: 721 tons, 51.9 %
Hull, fittings & equipment: 413 tons, 29.7 %
Fuel, ammunition & stores: 195 tons, 14.0 %
Miscellaneous weights: 45 tons, 3.2 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
352 lbs / 160 Kg = 8.7 x 4.3 " / 110 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.27
Seaboat quality (Average = 1.00): 0.95
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.425
Length to Beam Ratio: 10.16 : 1
'Natural speed' for length: 18.03 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 74
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: 21.00 ft / 6.40 m
- Forecastle (30 %): 20.00 ft / 6.10 m
- Mid (40 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 14.12 ft / 4.30 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 180.6 %
- Above water (accommodation/working, high = better): 95.3 %
Waterplane Area: 6,507 Square feet or 605 Square metres
Displacement factor (Displacement / loading): 65 %
Structure weight / hull surface area: 32 lbs/sq ft or 155 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 2.01
- Overall: 0.59
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather
Breakdown of Miscellaneous Weights:
- 15 tons for Kodkod or Colocolo (probable 1940 installation)
- 5 tons for paravanes and minesweeping equipment
- 5 tons for electronics
- 5 tons for hydrophones
- 15 tons for depth charges (70x420-lb bombs) or mines (16x2000-lb mines)
Ships in Class:
- Teniente Aldea (DDE-09)
- Teniente Serrano (DDE-10)
- Teniente Videla (DDE-11)
- Teniente Requelme (DDE-12)
- Teniente Ibarra (DDE-13)
- Teniente de la Fuente (DDE-14)
- Teniente Hoste (DDE-15)
- Teniente Larraguibel (DDE-16)
Notes:
These ships are acquired for use as antisubmarine escorts and anti-air protection, and so their relatively light firepower is not as concerning as it otherwise might be. They were decommissioned in early 1945 to clear their names for the refitted Farragut-class destroyers.
Quoted
Alphabet Destroyer D-class, Atlantean-built Chilean Destroyer laid down 1917 (Engine 1938)
Rebuilt as Destroyer-Escort+Minesweeper in 1939
Displacement:
1,195 t light; 1,244 t standard; 1,389 t normal; 1,505 t full load
Dimensions: Length overall / water x beam x draught
330.63 ft / 325.00 ft x 32.00 ft x 11.00 ft (normal load)
100.78 m / 99.06 m x 9.75 m x 3.35 m
Armament:
3 - 4.33" / 110 mm guns in single mounts, 40.61lbs / 18.42kg shells, 1938 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 1 raised mount
2 - 1.57" / 40.0 mm guns (1x2 guns), 1.95lbs / 0.88kg shells, 1938 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1917 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 127 lbs / 57 kg
Shells per gun, main battery: 300
4 - 21.0" / 533.4 mm above water torpedoes
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 36,005 shp / 26,860 Kw = 33.00 kts
Range 5,000nm at 13.50 kts
Bunker at max displacement = 261 tons
Complement:
113 - 147
Cost:
£0.284 million / $1.135 million
Distribution of weights at normal displacement:
Armament: 16 tons, 1.1 %
Machinery: 721 tons, 51.9 %
Hull, fittings & equipment: 413 tons, 29.7 %
Fuel, ammunition & stores: 195 tons, 14.0 %
Miscellaneous weights: 45 tons, 3.2 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
352 lbs / 160 Kg = 8.7 x 4.3 " / 110 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.27
Seaboat quality (Average = 1.00): 0.95
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.425
Length to Beam Ratio: 10.16 : 1
'Natural speed' for length: 18.03 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 74
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: 21.00 ft / 6.40 m
- Forecastle (30 %): 20.00 ft / 6.10 m
- Mid (40 %): 20.00 ft / 6.10 m (10.00 ft / 3.05 m aft of break)
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 14.12 ft / 4.30 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 180.6 %
- Above water (accommodation/working, high = better): 95.3 %
Waterplane Area: 6,507 Square feet or 605 Square metres
Displacement factor (Displacement / loading): 65 %
Structure weight / hull surface area: 32 lbs/sq ft or 155 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.51
- Longitudinal: 2.01
- Overall: 0.59
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather
Breakdown of Miscellaneous Weights:
- 15 tons for Kodkod or Colocolo (probable 1940 installation)
- 5 tons for paravanes and minesweeping equipment
- 5 tons for electronics
- 5 tons for hydrophones
- 15 tons for depth charges (70x420-lb bombs) or mines (16x2000-lb mines)
Ships in Class:
- Teniente Villaroel (DDE-17)
- Teniente Don Francisco (DDE-18)
- Teniente Livingstone (DDE-19)
- Teniente Lafourcade (DDE-20)
- Teniente Huneeus (DDE-21)
- Teniente Toesca (DDE-22)
- Teniente Cabrillo (DDE-23)
- Teniente Don Diego (DDE-24)
Notes:
Alphabet destroyers built to repeat Aldea-class specifications. These ships are acquired for use as antisubmarine escorts and anti-air protection, and so their relatively light firepower is not as concerning as it otherwise might be.
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