Almirante Class, Empire of Brazil Light Cruiser laid down 1935
Displacement:
10,713 t light; 11,150 t standard; 12,007 t normal; 12,693 t full load
Dimensions: Length overall / water x beam x draught
614.11 ft / 600.00 ft x 65.00 ft x 21.60 ft (normal load)
187.18 m / 182.88 m x 19.81 m x 6.58 m
Armament:
15 - 6.00" / 152 mm guns (5x3 guns), 120.00lbs / 54.43kg shells, 1935 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 2 raised mounts - superfiring
8 - 4.72" / 120 mm guns (4x2 guns), 52.72lbs / 23.92kg shells, 1935 Model
Breech loading guns in deck mounts with hoists
on side, all amidships
20 - 1.46" / 37.0 mm guns (10x2 guns), 1.55lbs / 0.70kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
16 - 0.54" / 13.7 mm guns in single mounts, 0.08lbs / 0.04kg shells, 1935 Model
Breech loading guns in deck mounts
on side, evenly spread, 6 raised mounts
Weight of broadside 2,254 lbs / 1,022 kg
Shells per gun, main battery: 150
12 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 402.00 ft / 122.53 m 10.00 ft / 3.05 m
Ends: Unarmoured
Main Belt covers 103 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.00" / 102 mm 2.25" / 57 mm 4.00" / 102 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm
3rd: 1.00" / 25 mm - -
- Armour deck: 3.45" / 88 mm, Conning tower: 3.00" / 76 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 78,244 shp / 58,370 Kw = 30.50 kts
Range 10,000nm at 12.00 kts
Bunker at max displacement = 1,543 tons
Complement:
573 - 745
Cost:
£4.602 million / $18.407 million
Distribution of weights at normal displacement:
Armament: 259 tons, 2.2 %
Armour: 3,217 tons, 26.8 %
- Belts: 1,006 tons, 8.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 521 tons, 4.3 %
- Armour Deck: 1,657 tons, 13.8 %
- Conning Tower: 34 tons, 0.3 %
Machinery: 2,223 tons, 18.5 %
Hull, fittings & equipment: 5,014 tons, 41.8 %
Fuel, ammunition & stores: 1,294 tons, 10.8 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
19,161 lbs / 8,691 Kg = 177.4 x 6.0 " / 152 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 3.2 ft / 1.0 m
Roll period: 15.3 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.58
Seaboat quality (Average = 1.00): 1.36
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.499
Length to Beam Ratio: 9.23 : 1
'Natural speed' for length: 24.49 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 52
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.25 ft / 9.22 m
- Forecastle (17 %): 22.00 ft / 6.71 m
- Mid (50 %): 22.00 ft / 6.71 m
- Quarterdeck (16 %): 22.00 ft / 6.71 m
- Stern: 22.00 ft / 6.71 m
- Average freeboard: 22.56 ft / 6.88 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77.7 %
- Above water (accommodation/working, high = better): 149.6 %
Waterplane Area: 25,958 Square feet or 2,412 Square metres
Displacement factor (Displacement / loading): 123 %
Structure weight / hull surface area: 117 lbs/sq ft or 573 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.79
- Overall: 1.05
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
Three ships:
Almirante Barroso
Almirante Tamandaré
Almirante Abreu