WesWorld

Vanguardia-class Antarctic Patrol/Expeditionary Ship
- Vanguardia - 1937

Piloto Pardo-class Oceanic Patrol Ship
- Piloto Pardo - 1918/1938

Ignacy Domeyko-class Polar Exploration Ship
- Ignacy Domeyko - 1928 (acquired 1942)

Vanguardia, Chilean Sealer (converted to Antarctic Patrol/Expeditionary Ship) laid down 1937

Displacement:
3,303 t light; 3,393 t standard; 3,962 t normal; 4,417 t full load

Dimensions: Length overall / water x beam x draught
362.76 ft / 360.89 ft x 42.65 ft (Bulges 49.21 ft) x 16.40 ft (normal load)
110.57 m / 110.00 m x 13.00 m (Bulges 15.00 m) x 5.00 m

Armament:
2 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1937 Model
Dual purpose guns in deck mounts with hoists
on centreline, all forward, 1 raised mount
8 - 1.57" / 40.0 mm guns (2x4 guns), 1.95lbs / 0.88kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1937 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 43 lbs / 20 kg
Shells per gun, main battery: 350

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Ends: 1.57" / 40 mm 161.98 ft / 49.37 m 7.78 ft / 2.37 m
0.92 ft / 0.28 m Unarmoured ends

- Torpedo Bulkhead and Bulges:
1.57" / 40 mm 213.25 ft / 65.00 m 16.40 ft / 5.00 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -

- Conning tower: 0.98" / 25 mm

Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Geared drive, 2 shafts, 7,959 shp / 5,937 Kw = 20.00 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 1,024 tons

Complement:
249 - 324

Cost:
£0.824 million / $3.296 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.1 %
Armour: 286 tons, 7.2 %
- Belts: 73 tons, 1.9 %
- Torpedo bulkhead: 204 tons, 5.1 %
- Armament: 3 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 5 tons, 0.1 %
Machinery: 221 tons, 5.6 %
Hull, fittings & equipment: 1,492 tons, 37.6 %
Fuel, ammunition & stores: 659 tons, 16.6 %
Miscellaneous weights: 1,300 tons, 32.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
8,796 lbs / 3,990 Kg = 683.3 x 3.0 " / 75 mm shells or 2.5 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 1.7 ft / 0.5 m
Roll period: 15.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.476
Length to Beam Ratio: 7.33 : 1
'Natural speed' for length: 22.32 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 25
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: 21.33 ft / 6.50 m
- Forecastle (20 %): 18.04 ft / 5.50 m
- Mid (50 %): 18.04 ft / 5.50 m
- Quarterdeck (25 %): 18.04 ft / 5.50 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 18.31 ft / 5.58 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 105.5 %
- Above water (accommodation/working, high = better): 144.0 %
Waterplane Area: 10,433 Square feet or 969 Square metres
Displacement factor (Displacement / loading): 191 %
Structure weight / hull surface area: 73 lbs/sq ft or 355 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.02
- Longitudinal: 3.71
- Overall: 1.16
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

Breakdown of Miscellaneous Weights:
- 35 tons: Crane and hanger
- 50 tons: Two float/ski planes
- 200 tons: Ballast rocking tanks
- 200 tons: Reinforced icebreaker bow
- 20 tons: Heating
- 15 tons: Five two-man aerosans/snow tractors or three heavy long-ranged aerosans/snow tractors
- 930 tons: Cargo Areas

Ships in Class:
- Vanguardia (APS-1) - converted 1937

Image by Alvama, thanks Alex!

Piloto Pardo, Chilean Icecutter laid down 1918 (Engine 1938)

Displacement:
2,849 t light; 2,964 t standard; 3,917 t normal; 4,679 t full load

Dimensions: Length overall / water x beam x draught
412.43 ft / 390.00 ft x 42.00 ft x 18.00 ft (normal load)
125.71 m / 118.87 m x 12.80 m x 5.49 m

Armament:
4 - 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, evenly spread, 2 raised mounts - superfiring
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
4 - 0.79" / 20.0 mm guns (1x4 guns), 0.24lbs / 0.11kg shells, 1938 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
Weight of broadside 179 lbs / 81 kg
Shells per gun, main battery: 350

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Ends: Unarmoured

- Torpedo Bulkhead:
1.50" / 38 mm 253.50 ft / 77.27 m 15.14 ft / 4.61 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
2nd: 1.00" / 25 mm - -
3rd: 1.00" / 25 mm - -

- Conning tower: 2.00" / 51 mm

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 2 shafts, 5,925 shp / 4,420 Kw = 18.00 kts
Range 9,000nm at 18.00 kts
Bunker at max displacement = 1,715 tons

Complement:
246 - 321

Cost:
£0.282 million / $1.130 million

Distribution of weights at normal displacement:
Armament: 22 tons, 0.6 %
Armour: 244 tons, 6.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 213 tons, 5.4 %
- Armament: 21 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 11 tons, 0.3 %
Machinery: 162 tons, 4.1 %
Hull, fittings & equipment: 2,160 tons, 55.1 %
Fuel, ammunition & stores: 1,068 tons, 27.3 %
Miscellaneous weights: 260 tons, 6.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
17,464 lbs / 7,922 Kg = 430.0 x 4.3 " / 110 mm shells or 6.2 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.8 ft / 0.5 m
Roll period: 13.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.17
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.465
Length to Beam Ratio: 9.29 : 1
'Natural speed' for length: 19.75 kts
Power going to wave formation at top speed: 36 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 8.00 ft / 2.44 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.00 ft / 7.62 m
- Forecastle (20 %): 22.00 ft / 6.71 m
- Mid (50 %): 20.00 ft / 6.10 m (12.00 ft / 3.66 m aft of break)
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 17.34 ft / 5.29 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 52.1 %
- Above water (accommodation/working, high = better): 134.5 %
Waterplane Area: 10,580 Square feet or 983 Square metres
Displacement factor (Displacement / loading): 389 %
Structure weight / hull surface area: 103 lbs/sq ft or 504 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.51
- Longitudinal: 4.74
- Overall: 1.69
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

Breakdown of Miscellaneous Weights:

Ships in Class:
- Piloto Pardo (APS-2) - built 1918, converted 1938

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



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.