Iztaccíhuatl
Samal class, Mexican (ex-Filipino) battlecruiser, laid down 1925 (bought 1942)
Displacement: 23,120 t light; 24,355 t standard; 26,422 t normal; 27,969 t full load
Dimensions: Length overall / water x beam x draught
752.68 ft / 750.00 ft x 80.00 ft (Bulges 91.20 ft) x 26.00 ft (normal load) [229.42 m / 228.60 m x 24.38 m (Bulges 27.80 m) x 7.92 m]
Armament:
6 - 12.60" / 320 mm guns (3x2 guns), 1,050.00lbs / 476.27kg shells, 1926 Model Breech loading guns in turrets (on barbettes) on centreline ends, majority forward, 1 raised mount - superfiring
10 - 6.10" / 155 mm guns (5x2 guns), 120.00lbs / 54.43kg shells, 1926 Model Breech loading guns in turrets (on barbettes) on side, all amidships, 1 raised mount - superfiring
18 - 3.94" / 100 mm guns (6x2, 6x1 guns), 32.00lbs / 14.51kg shells, 1923 Model Dual purpose guns in deck mounts with hoists on side, evenly spread, 8 raised mounts - 2 superfiring
4 - 2.24" / 57.0 mm guns in single mounts, 6.00lbs / 2.72kg shells, 1923 Model Dual purpose guns in deck mounts on side, all amidships, all raised mounts
8 - 1.57" / 40.0 mm guns in single mounts, 2.00lbs / 0.91kg shells, 1918 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 8,116 lbs / 3,681 kg
Shells per gun, main battery: 150
8 - 21.0" / 533.5 mm above water torpedoes (provision for 24" / 610 mm)
Armour:
Belts: Width (max) Length (avg) Height (avg)
Main: 8.27" / 210 mm 564.00 ft / 171.91 m 11.46 ft / 3.49 m
Ends: Unarmoured
Upper: 1.57" / 40 mm 564.00 ft / 171.91 m 14.00 ft / 4.27 m
Main Belt covers 116 % of normal length
Torpedo Bulkhead and Bulges: 1.18" / 30 mm 564.00 ft / 171.91 m 23.33 ft / 7.11 m
Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.27" / 210 mm 5.12" / 130 mm 8.27" / 210 mm
2nd: 2.95" / 75 mm 1.57" / 40 mm 2.95" / 75 mm
3rd: 1.18" / 30 mm 0.54" / 14 mm 0.59" / 15 mm
4th: 0.98" / 25 mm - -
5th: 0.79" / 20 mm - -
Armour deck: 3.15" / 80 mm, Conning tower: 5.12" / 130 mm
Machinery:
Oil fired boilers, steam turbines, Geared drive, 4 shafts, 140,750 shp / 105,000 Kw = 31.73 kts
Range 13,500nm at 12.00 kts (Bunkerage = 3,683 tons)
Complement: 67 officers and 1,125 men
Cost: £7.396 million / $29.584 million
Distribution of weights at normal displacement:
Armament: 965 tons, 3.7 %
Armour: 7,141 tons, 27.0 %
- Belts: 2,697 tons, 10.2 %
- Torpedo bulkhead: 575 tons, 2.2 %
- Armament: 1,482 tons, 5.6 %
- Armour Deck: 2,289 tons, 8.7 %
- Conning Tower: 98 tons, 0.4 %
Machinery: 4,570 tons, 17.3 %
Hull, fittings & equipment: 10,344 tons, 39.1 %
Fuel, ammunition & stores: 3,302 tons, 12.5 %
Miscellaneous weights: 100 tons, 0.4 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
19,970 lbs / 9,058 Kg = 19.1 x 12.6 " / 320 mm shells or 2.8 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 5.3 ft / 1.6 m
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.56
Seaboat quality (Average = 1.00): 1.11
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.520
Length to Beam Ratio: 8.22: 1
'Natural speed' for length: 27.39 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 63
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: -2.00 ft / -0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.60 ft / 9.33 m
- Forecastle (20 %): 22.50 ft / 6.86 m
- Mid (50 %): 21.50 ft / 6.55 m
- Quarterdeck (15 %): 21.50 ft / 6.55 m
- Stern: 21.50 ft / 6.55 m
- Average freeboard: 22.50 ft / 6.86 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 115.6 %
- Above water (accommodation/working, high = better): 138.1 %
Waterplane Area: 39,280 Square feet or 3,649 Square metres
Displacement factor (Displacement / loading): 110 %
Structure weight / hull surface area: 163 lbs/sq ft or 798 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.11
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Armour belt is 210mm + 40mm decapping plate
Misc. weight:
50t...catapult+aircraft
25t...flag accommodations
25t...acclimatization
Trials @ 24,000t, 20% overload: 33.67knt