Astraea class Canadian/Chilean (Ex-Atlantean) CL class
Astraea, Antrim sold to Chile in 1936
Adventure, Aurora, Achilles and Argyll sold to Canada 1932/33
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Astraea-class, Atlantean/Chilean Light Antiaircraft Cruiser laid down 1915, Rebuilt 1937[/SIZE]
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
Ships in Class:
-
Astraea (CL-10) - 1915/1937
-
Tierra del Fuego (CL-11) - 1915/1937
Canadian Argyle Class CL conversion
Argyll class CL's, laid down 1915
Adventure, Aurora, Achilles and Argyll sold to Canada 1932/33
Argyll, Enter country Enter ship type 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