ARA Libertad
Project 101D Libertad, Argentina/ USA Battleship laid down 1915 (Engine 1934)
Displacement:
30,357 t light; 32,023 t standard; 34,177 t normal; 35,900 t full load
Dimensions: Length overall / water x beam x draught
634.64 ft / 623.36 ft x 95.14 ft (Bulges 108.27 ft) x 29.20 ft (normal load)
193.44 m / 190.00 m x 29.00 m (Bulges 33.00 m) x 8.90 m
Armament:
10 - 14.02" / 356 mm guns (4 mounts), 1,372.00lbs / 622.33kg shells, 1915 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
16 - 4.53" / 115 mm guns (8x2 guns), 46.40lbs / 21.05kg shells, 1933 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships
32 - 1.46" / 37.0 mm guns (8x4 guns), 1.55lbs / 0.70kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
48 - 0.79" / 20.0 mm guns (8x6 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 14,524 lbs / 6,588 kg
Shells per gun, main battery: 120
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 13.5" / 343 mm 340.00 ft / 103.63 m 16.00 ft / 4.88 m
Ends: Unarmoured
Upper: 3.15" / 80 mm 340.00 ft / 103.63 m 8.04 ft / 2.45 m
Main Belt covers 84 % of normal length
- Torpedo Bulkhead and Bulges:
2.95" / 75 mm 426.51 ft / 130.00 m 27.86 ft / 8.49 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 13.5" / 343 mm 9.00" / 229 mm 12.0" / 305 mm
2nd: 1.97" / 50 mm 1.38" / 35 mm 2.76" / 70 mm
3rd: 0.39" / 10 mm 0.20" / 5 mm -
4th: 0.47" / 12 mm - -
- Armour deck: 5.91" / 150 mm, Conning tower: 13.50" / 343 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 60,000 shp / 44,760 Kw = 23.66 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 3,877 tons
Complement:
1,256 - 1,633
Cost:
£4.122 million / $16.489 million
Distribution of weights at normal displacement:
Armament: 1,821 tons, 5.3 %
Armour: 13,308 tons, 38.9 %
- Belts: 3,733 tons, 10.9 %
- Torpedo bulkhead: 1,298 tons, 3.8 %
- Armament: 3,201 tons, 9.4 %
- Armour Deck: 4,770 tons, 14.0 %
- Conning Tower: 306 tons, 0.9 %
Machinery: 1,726 tons, 5.1 %
Hull, fittings & equipment: 13,351 tons, 39.1 %
Fuel, ammunition & stores: 3,820 tons, 11.2 %
Miscellaneous weights: 150 tons, 0.4 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
53,158 lbs / 24,112 Kg = 38.6 x 14.0 " / 356 mm shells or 11.1 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 5.4 ft / 1.6 m
Roll period: 19.6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.54
Seaboat quality (Average = 1.00): 1.24
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.607
Length to Beam Ratio: 5.76 : 1
'Natural speed' for length: 24.97 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 57
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (20 %): 24.61 ft / 7.50 m
- Mid (60 %): 24.61 ft / 7.50 m (13.12 ft / 4.00 m aft of break)
- Quarterdeck (15 %): 13.12 ft / 4.00 m
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 20.01 ft / 6.10 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.5 %
- Above water (accommodation/working, high = better): 133.7 %
Waterplane Area: 43,662 Square feet or 4,056 Square metres
Displacement factor (Displacement / loading): 109 %
Structure weight / hull surface area: 213 lbs/sq ft or 1,039 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.05
- Longitudinal: 1.64
- Overall: 1.10
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
Changes:
14in guns elevation increased to 30 degrees
New 115mm DP armament added in place of casemates
New light AA outfit
New RD Mk.I, RD Mk.III and HACS Mk.10 rangefinders and fire control equipment
End belts removed and new upper decapping belt added
Hull bulged and new three-layer torpedo bulkhead system added
Deck armour added
New machinery to increase speed by 1kt and save space
Bulges to carry more oil fuel for better range