Ignacy Domeyko, Chilean Polar Patrol and Exploration Ship laid down 1928, refitted 1942
Displacement:
8,235 t light; 8,474 t standard; 10,766 t normal; 12,600 t full load
Dimensions: Length overall / water x beam x draught
498.69 ft / 498.69 ft x 88.58 ft x 13.12 ft (normal load)
152.00 m / 152.00 m x 27.00 m x 4.00 m
Armament:
2 - 5.91" / 150 mm guns (1x2 guns), 103.00lbs / 46.72kg shells, 1919 Model
Breech loading guns in a turret (on a barbette)
on centreline aft
6 - 2.95" / 75.0 mm guns (3x2 guns), 12.87lbs / 5.84kg shells, 1943 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, majority forward, 2 raised mounts - superfiring
8 - 1.10" / 27.9 mm guns (2x4 guns), 0.67lbs / 0.30kg shells, 1943 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 289 lbs / 131 kg
Shells per gun, main battery: 135
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.95" / 75 mm 328.08 ft / 100.00 m 11.48 ft / 3.50 m
Ends: 3.94" / 100 mm 170.60 ft / 52.00 m 11.48 ft / 3.50 m
Main Belt covers 101 % of normal length
- Torpedo Bulkhead:
1.97" / 50 mm 498.69 ft / 152.00 m 12.30 ft / 3.75 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.02" / 102 mm 0.04" / 1 mm 1.97" / 50 mm
2nd: 0.79" / 20 mm 0.20" / 5 mm 0.20" / 5 mm
3rd: 0.79" / 20 mm 0.20" / 5 mm -
- Conning tower: 3.15" / 80 mm
Machinery:
Diesel Internal combustion generators,
Electric motors, 4 shafts, 17,990 shp / 13,421 Kw = 19.95 kts
Range 15,000nm at 15.00 kts
Bunker at max displacement = 4,126 tons
Complement:
528 - 687
Cost:
£1.516 million / $6.062 million
Distribution of weights at normal displacement:
Armament: 36 tons, 0.3 %
Armour: 1,293 tons, 12.0 %
- Belts: 780 tons, 7.2 %
- Torpedo bulkhead: 447 tons, 4.2 %
- Armament: 33 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 33 tons, 0.3 %
Machinery: 560 tons, 5.2 %
Hull, fittings & equipment: 5,146 tons, 47.8 %
Fuel, ammunition & stores: 2,531 tons, 23.5 %
Miscellaneous weights: 1,200 tons, 11.1 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
49,804 lbs / 22,591 Kg = 483.6 x 5.9 " / 150 mm shells or 15.2 torpedoes
Stability (Unstable if below 1.00): 1.51
Metacentric height 8.4 ft / 2.6 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.30
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.650
Length to Beam Ratio: 5.63 : 1
'Natural speed' for length: 22.33 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: -6.56 ft / -2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.43 ft / 7.75 m
- Forecastle (20 %): 17.22 ft / 5.25 m
- Mid (50 %): 16.40 ft / 5.00 m
- Quarterdeck (15 %): 16.40 ft / 5.00 m
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 17.35 ft / 5.29 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 42.8 %
- Above water (accommodation/working, high = better): 202.6 %
Waterplane Area: 33,841 Square feet or 3,144 Square metres
Displacement factor (Displacement / loading): 276 %
Structure weight / hull surface area: 127 lbs/sq ft or 619 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.39
- Longitudinal: 1.40
- Overall: 1.39
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
Good seaboat, rides out heavy weather easily
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CNS Ignacy Domeyko, Chilean (Ex-Filipino) Polar Exploration Ship, laid down 1928
Displacement:
8,232 t light; 8,474 t standard; 10,766 t normal; 12,600 t full load
Dimensions: Length overall / water x beam x draught
498.69 ft / 498.69 ft x 88.58 ft x 13.12 ft (normal load)
152.00 m / 152.00 m x 27.00 m x 4.00 m
Armament:
2 - 6.00" / 152 mm guns (1x2 guns), 108.00lbs / 48.99kg shells, 1919 Model
Breech loading guns in a turret (on a barbette)
on centreline aft
2 - 3.94" / 100 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1923 Model
Quick firing guns in deck mounts with hoists
on side, all forward
6 - 2.24" / 57.0 mm guns in single mounts, 6.00lbs / 2.72kg shells, 1923 Model
Quick firing guns in deck mounts
on side, evenly spread
3 - 0.98" / 25.0 mm guns (1x3 guns), 0.57lbs / 0.26kg shells, 1925 Model
Anti-aircraft guns in deck mount
on side aft, all raised guns
8 - 0.54" / 13.7 mm guns (2x4 guns), 0.11lbs / 0.05kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 319 lbs / 145 kg
Shells per gun, main battery: 135
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.95" / 75 mm 328.08 ft / 100.00 m 11.48 ft / 3.50 m
Ends: 3.94" / 100 mm 170.60 ft / 52.00 m 11.48 ft / 3.50 m
Main Belt covers 101 % of normal length
- Torpedo Bulkhead:
1.97" / 50 mm 498.69 ft / 152.00 m 12.30 ft / 3.75 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.00" / 102 mm 2.00" / 51 mm 1.97" / 50 mm
2nd: 1.18" / 30 mm 0.79" / 20 mm 0.79" / 20 mm
3rd: 0.98" / 25 mm 0.59" / 15 mm -
4th: 0.59" / 15 mm - -
5th: 0.59" / 15 mm - -
- Conning tower: 3.15" / 80 mm
Machinery:
Diesel Internal combustion generators,
Electric motors, 4 shafts, 18,000 shp / 13,428 Kw = 19.95 kts
Range 15,000nm at 15.00 kts (Bunkerage = 4,126 tons)
Complement:
528 - 687
Cost:
£1.525 million / $6.101 million
Distribution of weights at normal displacement:
Armament: 39 tons, 0.4 %
Armour: 1,312 tons, 12.2 %
- Belts: 780 tons, 7.2 %
- Torpedo bulkhead: 447 tons, 4.2 %
- Armament: 52 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 33 tons, 0.3 %
Machinery: 560 tons, 5.2 %
Hull, fittings & equipment: 5,321 tons, 49.4 %
Fuel, ammunition & stores: 2,534 tons, 23.5 %
Miscellaneous weights: 1,000 tons, 9.3 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
40,862 lbs / 18,535 Kg = 378.4 x 6.0 " / 152 mm shells or 10.6 torpedoes
Stability (Unstable if below 1.00): 1.52
Metacentric height 8.5 ft / 2.6 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.29
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.650
Length to Beam Ratio: 5.63 : 1
'Natural speed' for length: 22.33 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: -6.56 ft / -2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.43 ft / 7.75 m
- Forecastle (20 %): 17.22 ft / 5.25 m
- Mid (50 %): 16.40 ft / 5.00 m
- Quarterdeck (15 %): 16.40 ft / 5.00 m
- Stern: 16.40 ft / 5.00 m
- Average freeboard: 17.35 ft / 5.29 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 40.5 %
- Above water (accommodation/working, high = better): 202.6 %
Waterplane Area: 33,841 Square feet or 3,144 Square metres
Displacement factor (Displacement / loading): 287 %
Structure weight / hull surface area: 131 lbs/sq ft or 640 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.44
- Longitudinal: 1.45
- Overall: 1.44
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
Good seaboat, rides out heavy weather easily
Breakdown of Miscellaneous Weights:
25t for flag facilities
50t for winterisation
175t for 6 aircraft + one catapult
750t for scientific crew + equipment
Notes:
Ex
Pacifica, purchased from the Philippines in Q1/1942.