(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