The It/CA/1931 Heavy Armour Version

The It/CA/1931 Heavy Armour has much better protection than the Fast Version. The side armour is 5in and is 16ft high. The speed is less, at 34 knots. The length is slightly less. This is the Springsharp report:

It/CA/1931 Heavier Armour Version, Italy Heavy Cruiser laid down 1931 (Engine 1945)

Displacement:
 13,465 t light; 13,919 t standard; 14,598 t normal; 15,142 t full load

Dimensions: Length overall / water x beam x draught
 646.57 ft / 645.00 ft x 67.00 ft x 21.00 ft (normal load)
 197.08 m / 196.60 m x 20.42 m  x 6.40 m

Armament:
      8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1931 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 2 raised mounts - superfiring
      8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1931 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      24 - 1.46" / 37.0 mm guns (12x2 guns), 1.55lbs / 0.70kg shells, 1931 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 2,341 lbs / 1,062 kg
 Shells per gun, main battery: 120
 8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 420.00 ft / 128.02 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 100 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 420.00 ft / 128.02 m 21.00 ft / 6.40 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm
 2nd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 5.00" / 127 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 136,720 shp / 101,993 Kw = 34.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 1,223 tons

Complement:
 663 - 863

Cost:
 £5.238 million / $20.953 million

Distribution of weights at normal displacement:
 Armament: 293 tons, 2.0 %
 Armour: 3,615 tons, 24.8 %
    - Belts: 1,406 tons, 9.6 %
    - Torpedo bulkhead: 326 tons, 2.2 %
    - Armament: 688 tons, 4.7 %
    - Armour Deck: 1,130 tons, 7.7 %
    - Conning Tower: 64 tons, 0.4 %
 Machinery: 3,453 tons, 23.7 %
 Hull, fittings & equipment: 6,105 tons, 41.8 %
 Fuel, ammunition & stores: 1,133 tons, 7.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   20,614 lbs / 9,350 Kg = 80.5 x 8.0 " / 203 mm shells or 2.6 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 3.4 ft / 1.0 m
 Roll period: 15.4 seconds
 Steadiness - As gun platform (Average = 50 %): 59 %
   - Recoil effect (Restricted arc if above 1.00): 0.54
 Seaboat quality  (Average = 1.00): 1.19

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.563
 Length to Beam Ratio: 9.63 : 1
 'Natural speed' for length: 25.40 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  30.00 ft / 9.14 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (50 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 25.08 ft / 7.64 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 131.8 %
  - Above water (accommodation/working, high = better): 188.9 %
 Waterplane Area: 30,529 Square feet or 2,836 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 120 lbs/sq ft or 585 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.78
  - Overall: 1.02
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent