MIBN Netuno, Empire of Brazil Battleship laid down 1942
Displacement:
57,117 t light; 60,102 t standard; 62,409 t normal; 64,255 t full load
Dimensions: Length overall / water x beam x draught
900.84 ft / 880.00 ft x 102.00 ft (Bulges 117.50 ft) x 32.50 ft (normal load)
274.58 m / 268.22 m x 31.09 m (Bulges 35.81 m) x 9.91 m
Armament:
9 - 16.34" / 415 mm guns (3x3 guns), 2,875.00lbs / 1,304.08kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward
3 - 5.98" / 152 mm guns (1x3 guns), 141.00lbs / 63.96kg shells, 1942 Model
Quick firing guns in a turret (on a barbette)
on side amidships, all raised guns
12 - 5.98" / 152 mm guns (4x3 guns), 141.00lbs / 63.96kg shells, 1942 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships
32 - 1.46" / 37.0 mm guns (8x4 guns), 1.55lbs / 0.70kg shells, 1942 Model
Anti-aircraft guns in deck mounts with hoists
on side, evenly spread, all raised mounts
24 - 0.54" / 13.7 mm guns in single mounts, 0.08lbs / 0.04kg shells, 1942 Model
Machine guns in deck mounts
on side, evenly spread, 12 raised mounts
Weight of broadside 28,042 lbs / 12,719 kg
Shells per gun, main battery: 110
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 15.5" / 394 mm 572.00 ft / 174.35 m 15.70 ft / 4.79 m
Ends: Unarmoured
Main Belt covers 100 % of normal length
- Torpedo Bulkhead and Bulges:
2.25" / 57 mm 570.00 ft / 173.74 m 32.80 ft / 10.00 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 19.0" / 483 mm 11.3" / 286 mm 19.0" / 483 mm
2nd: 4.75" / 121 mm 2.75" / 70 mm 4.75" / 121 mm
3rd: 4.75" / 121 mm 2.75" / 70 mm 4.75" / 121 mm
4th: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
5th: 0.80" / 20 mm - -
- Armour deck: 8.00" / 203 mm, Conning tower: 19.00" / 483 mm
Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Electric motors, 4 shafts, 130,871 shp / 97,630 Kw = 28.00 kts
Range 10,000nm at 12.00 kts
Bunker at max displacement = 4,153 tons
Complement:
1,973 - 2,566
Cost:
£29.990 million / $119.960 million
Distribution of weights at normal displacement:
Armament: 2,661 tons, 4.3 %
Armour: 25,070 tons, 40.2 %
- Belts: 5,912 tons, 9.5 %
- Torpedo bulkhead: 1,556 tons, 2.5 %
- Armament: 6,340 tons, 10.2 %
- Armour Deck: 10,617 tons, 17.0 %
- Conning Tower: 644 tons, 1.0 %
Machinery: 3,419 tons, 5.5 %
Hull, fittings & equipment: 25,468 tons, 40.8 %
Fuel, ammunition & stores: 5,293 tons, 8.5 %
Miscellaneous weights: 500 tons, 0.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
131,915 lbs / 59,836 Kg = 60.5 x 16.3 " / 415 mm shells or 23.6 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 6.7 ft / 2.0 m
Roll period: 19.1 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.91
Seaboat quality (Average = 1.00): 1.77
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.650
Length to Beam Ratio: 7.49 : 1
'Natural speed' for length: 34.10 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 40
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: 44.70 ft / 13.62 m
- Forecastle (17 %): 32.50 ft / 9.91 m
- Mid (50 %): 32.50 ft / 9.91 m
- Quarterdeck (17 %): 32.50 ft / 9.91 m
- Stern: 32.50 ft / 9.91 m
- Average freeboard: 33.33 ft / 10.16 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 65.2 %
- Above water (accommodation/working, high = better): 225.1 %
Waterplane Area: 71,738 Square feet or 6,665 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 232 lbs/sq ft or 1,131 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.63
- Overall: 1.00
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
Ships (2):
Netuno
Urano
Armour Notes: Armour belt is 14" thick with 1.5" decapping plate, while gun face and 17" of armour with 2" decapping plate.