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(Historical data)

Almirante Grau-class Extra Heavy Cruiser

(Iberian built)

Almirante Grau, Peru Extra Heavy Cruiser laid down 1934

Displacement: 14,329 t light; 15,142 t standard; 16,673 t normal; 17,898 t full load

Dimensions: Length overall / water x beam x draught
704.86 ft / 686.00 ft x 74.00 ft x 23.00 ft (normal load)
214.84 m / 209.09 m x 22.56 m x 7.01 m

Armament:
9 - 10.00" / 254 mm guns (3x3 guns), 500.00lbs / 226.80kg shells, 1934 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
18 - 4.72" / 120 mm guns (6x3 guns), 52.72lbs / 23.92kg shells, 1934 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships, 2 raised mounts - superfiring
32 - 1.46" / 37.0 mm guns (8x4 guns), 1.55lbs / 0.70kg shells, 1934 Model
Anti-aircraft guns in deck mounts with hoists
on side, evenly spread, 4 raised mounts
16 - 0.98" / 25.0 mm guns (8x2 guns), 0.48lbs / 0.22kg shells, 1934 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0.98" / 25.0 mm guns (2x4 guns), 0.48lbs / 0.22kg shells, 1934 Model
Machine guns in deck mounts
on centreline ends, evenly spread, all raised mounts
Weight of broadside 5,510 lbs / 2,499 kg
Shells per gun, main battery: 150
8 - 23.6" / 600 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5.91" / 150 mm 387.50 ft / 118.11 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 87 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.91" / 150 mm 3.94" / 100 mm 4.92" / 125 mm
2nd: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
3rd: 0.79" / 20 mm - -
4th: 0.79" / 20 mm - -
5th: 0.79" / 20 mm - -

- Armour deck: 2.76" / 70 mm, Conning tower: 3.94" / 100 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 96,133 shp / 71,716 Kw = 32.00 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 2,756 tons

Complement:
733 - 953

Cost:
£7.203 million / $28.811 million

Distribution of weights at normal displacement:
Armament: 689 tons, 4.1 %
Armour: 3,625 tons, 21.7 %
- Belts: 966 tons, 5.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 810 tons, 4.9 %
- Armour Deck: 1,793 tons, 10.8 %
- Conning Tower: 55 tons, 0.3 %
Machinery: 2,766 tons, 16.6 %
Hull, fittings & equipment: 7,150 tons, 42.9 %
Fuel, ammunition & stores: 2,344 tons, 14.1 %
Miscellaneous weights: 100 tons, 0.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
21,009 lbs / 9,530 Kg = 42.0 x 10.0 " / 254 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 3.8 ft / 1.2 m
Roll period: 15.9 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.64
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.500
Length to Beam Ratio: 9.27 : 1
'Natural speed' for length: 30.07 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 60
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.00 ft / 7.32 m
- Forecastle (25 %): 18.00 ft / 5.49 m
- Mid (50 %): 18.00 ft / 5.49 m
- Quarterdeck (15 %): 18.00 ft / 5.49 m
- Stern: 18.00 ft / 5.49 m
- Average freeboard: 18.60 ft / 5.67 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 86.9 %
- Above water (accommodation/working, high = better): 141.9 %
Waterplane Area: 35,167 Square feet or 3,267 Square metres
Displacement factor (Displacement / loading): 113 %
Structure weight / hull surface area: 142 lbs/sq ft or 693 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.13
- Overall: 1.01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Secondary armament = 3 X HA/LA twin turrets on each beam.
Torpedoes are mounted in 2 quad turrets, 1 to each beam



Refitted 1948 as follows:

Almirante Grau, Peruvian Heavy Cruiser laid down 1934

Displacement: 14,339 t light; 15,151 t standard; 16,682 t normal; 17,907 t full load

Dimensions: Length overall / water x beam x draught

704.84 ft / 685.99 ft x 74.02 ft x 23.00 ft (normal load) [214.84 m / 209.09 m x 22.56 m x 7.01 m]

Armament:

9 - 10.00" / 254 mm guns (3x3 guns), 500.00lbs / 226.80kg shells, 1934 Model Breech loading guns in turrets (on barbettes) on centerline ends, majority forward, 1 raised mount - superfiring
18 - 4.72" / 120 mm guns (6x3 guns), 52.72lbs / 23.91kg shells, 1934 Model Dual purpose guns in turrets (on barbettes) on side, all amidships, 2 raised mounts - superfiring
32 - 1.46" / 37.0 mm guns (8x4 guns), 1.55lbs / 0.70kg shells, 1934 Model Anti-aircraft guns in deck mounts on side, evenly spread, 4 raised mounts
Weight of broadside 5,499 lbs / 2,494 kg
Shells per gun, main battery: 150
8 - 23.6" / 600 mm above water torpedoes

Armor:

Belts: Width (max) Length (avg) Height (avg)
Main: 5.91" / 150 mm 387.50 ft / 118.11 m 9.84 ft / 3.00 m
Ends: Unarmored
Main Belt covers 87 % of normal length
Main belt does not fully cover magazines and engineering spaces

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.91" / 150 mm 3.94" / 100 mm 4.92" / 125 mm
2nd: 1.97" / 50 mm 0.98" / 25 mm 1.97" / 50 mm
3rd: 0.79" / 20 mm - -

Armor deck: 2.76" / 70 mm, Conning tower: 3.94" / 100 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 96,176 shp / 71,747 Kw = 32.00 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 2,756 tons

Complement: 733 - 954

Cost: £7.200 million / $28.798 million

Distribution of weights at normal displacement:

Armament: 687 tons, 4.1 %
Armor: 3,630 tons, 21.8 %
- Belts: 966 tons, 5.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 815 tons, 4.9 %
- Armor Deck: 1,794 tons, 10.8 %
- Conning Tower: 55 tons, 0.3 %
Machinery: 2,767 tons, 16.6 %
Hull, fittings & equipment: 7,135 tons, 42.8 %
Fuel, ammunition & stores: 2,343 tons, 14.0 %
Miscellaneous weights: 120 tons, 0.7 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 21,013 lbs / 9,531 Kg = 42.0 x 10.0 " / 254 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 3.8 ft / 1.2 m
Roll period: 15.9 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.64
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.500
Length to Beam Ratio: 9.27: 1
'Natural speed' for length: 30.07 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 60
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 4.99 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.02 ft / 7.32 m
- Forecastle (25 %): 18.01 ft / 5.49 m
- Mid (50 %): 18.01 ft / 5.49 m
- Quarterdeck (15 %): 18.01 ft / 5.49 m
- Stern: 18.01 ft / 5.49 m
- Average freeboard: 18.61 ft / 5.67 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 86.9 %
- Above water (accommodation/working, high = better): 142.0 %
Waterplane Area: 35,180 Square feet or 3,268 Square meters
Displacement factor (Displacement / loading): 113 %
Structure weight / hull surface area: 142 lbs/sq ft or 691 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.13
- Overall: 1.01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Refit Changes: (Level 2 Minor Refit)

Remove 25mm AA battery
Add Radar - Surface Search and Navigation - 20 tons
Add Radar - Air Search and AA Fire Control - 20 tons
Add Radar - Surface Fire Control - 10 tons
Update gun directors

Cost: 2,150 tons
Time: 105 days

Almirante Grau: Refit begun 1 July 1948, refit completed 14 October 1948

(Historical data)

Callao - laid down 1939

Displacement: 10,832 t light; 11,273 t standard; 12,247 t normal; 13,026 t full load

Dimensions: Length overall / water x beam x draught
649.91 ft / 623.36 ft x 62.34 ft (Bulges 63.98 ft) x 20.67 ft (normal load)
198.09 m / 190.00 m x 19.00 m (Bulges 19.50 m) x 6.30 m

Armament:
6 - 8.00" / 203 mm guns (2x3 guns), 256.00lbs / 116.12kg shells, 1931 Model
Breech loading guns in turrets (on barbettes)
on centreline, all forward, 1 raised mount - superfiring
12 - 4.72" / 120 mm guns (6x2 guns), 52.72lbs / 23.92kg shells, 1939 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, 2 raised mounts - superfiring
16 - 1.46" / 37.0 mm guns (4x4 guns), 1.55lbs / 0.70kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
16 - 0.79" / 20.0 mm guns (4x4 guns), 0.24lbs / 0.11kg shells, 1939 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 2,197 lbs / 997 kg
Shells per gun, main battery: 150
8 - 23.6" / 600 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.92" / 125 mm 405.18 ft / 123.50 m 9.84 ft / 3.00 m
Ends: 1.18" / 30 mm 213.25 ft / 65.00 m 8.20 ft / 2.50 m
4.92 ft / 1.50 m Unarmoured ends
Main Belt covers 100 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 4.50" / 114 mm 8.00" / 203 mm
2nd: 1.97" / 50 mm 0.98" / 25 mm 0.98" / 25 mm
3rd: 0.79" / 20 mm - -
4th: 0.79" / 20 mm - -

- Armour deck: 2.36" / 60 mm, Conning tower: 5.91" / 150 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 82,693 shp / 61,689 Kw = 32.00 kts
Range 12,000nm at 12.00 kts
Bunker at max displacement = 1,752 tons

Complement:
581 - 756

Cost:
£5.371 million / $21.483 million

Distribution of weights at normal displacement:
Armament: 275 tons, 2.2 %
Armour: 2,774 tons, 22.6 %
- Belts: 894 tons, 7.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 613 tons, 5.0 %
- Armour Deck: 1,199 tons, 9.8 %
- Conning Tower: 68 tons, 0.6 %
Machinery: 2,237 tons, 18.3 %
Hull, fittings & equipment: 5,047 tons, 41.2 %
Fuel, ammunition & stores: 1,415 tons, 11.6 %
Miscellaneous weights: 500 tons, 4.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
18,533 lbs / 8,406 Kg = 72.4 x 8.0 " / 203 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 3.0 ft / 0.9 m
Roll period: 15.6 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.53
Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.520
Length to Beam Ratio: 9.74 : 1
'Natural speed' for length: 28.48 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 46
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 16.40 ft / 5.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.89 ft / 8.50 m
- Forecastle (20 %): 24.61 ft / 7.50 m
- Mid (50 %): 20.18 ft / 6.15 m
- Quarterdeck (25 %): 20.18 ft / 6.15 m
- Stern: 20.18 ft / 6.15 m
- Average freeboard: 21.99 ft / 6.70 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 81.8 %
- Above water (accommodation/working, high = better): 157.8 %
Waterplane Area: 27,435 Square feet or 2,549 Square metres
Displacement factor (Displacement / loading): 123 %
Structure weight / hull surface area: 114 lbs/sq ft or 557 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.54
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weights:
- 30 tons for radar if acquired
- 100 tons for communications and flagship facilities
- 20 tons for heavy crane
- 50 tons for aviation maintenance facilities
- 400 tons for 8-10 floatplanes and catapults

As refit, 1948

Callao (II), Peruvian Heavy Cruiser laid down 1939

Displacement: 10,833 t light; 11,273 t standard; 12,247 t normal; 13,026 t full load

Dimensions: Length overall / water x beam x draught

649.91 ft / 623.36 ft x 62.34 ft (Bulges 63.98 ft) x 20.67 ft (normal load) [ 198.09 m / 190.00 m x 19.00 m (Bulges 19.50 m) x 6.30 m]

Armament:

6 - 8.00" / 203 mm guns (2x3 guns), 256.00lbs / 116.12kg shells, 1931 Model Breech loading guns in turrets (on barbettes) on centreline, all forward, 1 raised mount - superfiring
12 - 4.72" / 120 mm guns (6x2 guns), 52.72lbs / 23.91kg shells, 1939 Model Dual purpose guns in deck mounts with hoists on side, all amidships, 2 raised mounts - superfiring
16 - 1.46" / 37.0 mm guns (4x4 guns), 1.55lbs / 0.70kg shells, 1939 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 2,193 lbs / 995 kg
Shells per gun, main battery: 150
8 - 23.6" / 600 mm above water torpedoes

Armour:

Belts: Width (max) Length (avg) Height (avg)
Main: 4.92" / 125 mm 405.18 ft / 123.50 m 9.84 ft / 3.00 m
Ends: 1.18" / 30 mm 213.25 ft / 65.00 m 8.20 ft / 2.50 m
4.92 ft / 1.50 m Unarmoured ends
Main Belt covers 100 % of normal length

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 7.99" / 203 mm 4.49" / 114 mm 7.99" / 203 mm
2nd: 1.97" / 50 mm 0.98" / 25 mm 0.98" / 25 mm
3rd: 0.79" / 20 mm - -

Armour deck: 2.36" / 60 mm, Conning tower: 5.91" / 150 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 4 shafts, 82,693 shp / 61,689 Kw = 32.00 kts
Range 12,000nm at 12.00 kts
Bunker at max displacement = 1,752 tons

Complement: 581 - 756

Cost: £5.367 million / $21.468 million

Distribution of weights at normal displacement:

Armament: 274 tons, 2.2 %
Armour: 2,772 tons, 22.6 %
- Belts: 894 tons, 7.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 611 tons, 5.0 %
- Armour Deck: 1,199 tons, 9.8 %
- Conning Tower: 68 tons, 0.6 %
Machinery: 2,237 tons, 18.3 %
Hull, fittings & equipment: 5,040 tons, 41.2 %
Fuel, ammunition & stores: 1,414 tons, 11.5 %
Miscellaneous weights: 510 tons, 4.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 18,502 lbs / 8,392 Kg = 72.4 x 8.0 " / 203 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 2.9 ft / 0.9 m
Roll period: 15.6 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.53
Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.520
Length to Beam Ratio: 9.74 : 1
'Natural speed' for length: 28.48 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 46
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 16.40 ft / 5.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.89 ft / 8.50 m
- Forecastle (20 %): 24.61 ft / 7.50 m
- Mid (50 %): 20.18 ft / 6.15 m
- Quarterdeck (25 %): 20.18 ft / 6.15 m
- Stern: 20.18 ft / 6.15 m
- Average freeboard: 21.99 ft / 6.70 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 81.8 %
- Above water (accommodation/working, high = better): 157.8 %
Waterplane Area: 27,435 Square feet or 2,549 Square metres
Displacement factor (Displacement / loading): 123 %
Structure weight / hull surface area: 114 lbs/sq ft or 556 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.54
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Major Refit (25%)

Service life extension; modify aviation facilities and reduce the number of aircraft carried; add radar; remove 20mm batteries; increase miscellaneous weight (to account for radar)

Breakdown of Miscellaneous Weights:

Add Radar - Surface Search and Navigation - 20 tons
Add Radar - Air Search and AA Fire Control - 20 tons
Add Radar - Surface Fire Control - 10 tons

Communications and flagship facilities - 100 tons
Heavy crane - 20 tons
Aviation maintenance facilities - 40 tons
Catapults - 150 tons
Six Float Reconnaissance Aircraft - 150 tons

Cost: 2,708 tons
Time: 149 days

Callao - Refit begun 1 January 1948; Refit completed 29 May 1948