Riachuelo, brazilian battleship laid down 1914 (Engine 1916)
Displacement:
26 786 t light; 28 270 t standard; 30 500 t normal; 32 284 t full load
Dimensions: Length overall / water x beam x draught
660,11 ft / 660,11 ft x 94,16 ft x 27,89 ft (normal load)
201,20 m / 201,20 m x 28,70 m x 8,50 m
Armament:
8 - 15,00" / 381 mm guns (4x2 guns), 1 687,50lbs / 765,44kg shells, 1914 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
14 - 5,98" / 152 mm guns in single mounts, 107,15lbs / 48,60kg shells, 1914 Model
Quick firing guns in casemate mounts
on side, all amidships
10 - 4,02" / 102 mm guns in single mounts, 32,38lbs / 14,69kg shells, 1914 Model
Quick firing guns in deck mounts
on side, all amidships
4 - 2,99" / 76,0 mm guns in single mounts, 13,39lbs / 6,08kg shells, 1914 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 15 378 lbs / 6 975 kg
Shells per gun, main battery: 100
2 - 21,0" / 533 mm submerged torpedo tubes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 13,5" / 343 mm 424,87 ft / 129,50 m 15,09 ft / 4,60 m
Ends: 2,99" / 76 mm 231,30 ft / 70,50 m 11,15 ft / 3,40 m
3,94 ft / 1,20 m Unarmoured ends
Upper: 12,0" / 305 mm 214,90 ft / 65,50 m 8,53 ft / 2,60 m
Main Belt covers 99% of normal length
- Torpedo Bulkhead:
2,01" / 51 mm 515,09 ft / 157,00 m 24,28 ft / 7,40 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 13,0" / 330 mm 9,02" / 229 mm 13,0" / 330 mm
2nd: 7,01" / 178 mm - -
- Armour deck: 2,99" / 76 mm, Conning tower: 12,99" / 330 mm
Machinery:
Coal fired boilers, steam turbines,
Geared drive, 4 shafts, 44 484 shp / 33 185 Kw = 22,50 kts
Range 8 000nm at 12,00 kts
Bunker at max displacement = 4 014 tons (100% coal)
Complement:
1 153 - 1 500
Cost:
£3,573 million / $14,292 million
Distribution of weights at normal displacement:
Armament: 1 922 tons, 6,3%
Armour: 11 852 tons, 38,9%
- Belts: 5 189 tons, 17,0%
- Torpedo bulkhead: 929 tons, 3,0%
- Armament: 2 907 tons, 9,5%
- Armour Deck: 2 554 tons, 8,4%
- Conning Tower: 273 tons, 0,9%
Machinery: 1 823 tons, 6,0%
Hull, fittings & equipment: 11 189 tons, 36,7%
Fuel, ammunition & stores: 3 714 tons, 12,2%
Miscellaneous weights: 0 tons, 0,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
44 072 lbs / 19 991 Kg = 26,1 x 15,0 " / 381 mm shells or 7,2 torpedoes
Stability (Unstable if below 1.00): 1,15
Metacentric height 5,9 ft / 1,8 m
Roll period: 16,2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,68
Seaboat quality (Average = 1.00): 1,41
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,616
Length to Beam Ratio: 7,01 : 1
'Natural speed' for length: 25,69 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -11,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25,59 ft / 7,80 m
- Forecastle (20%): 21,33 ft / 6,50 m
- Mid (65%): 21,33 ft / 6,50 m (14,76 ft / 4,50 m aft of break)
- Quarterdeck (15%): 14,76 ft / 4,50 m
- Stern: 14,76 ft / 4,50 m
- Average freeboard: 19,37 ft / 5,90 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 86,4%
- Above water (accommodation/working, high = better): 147,2%
Waterplane Area: 46 137 Square feet or 4 286 Square metres
Displacement factor (Displacement / loading): 99%
Structure weight / hull surface area: 177 lbs/sq ft or 866 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,97
- Longitudinal: 1,26
- Overall: 1,00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
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