RM Pisa, Italian Light Cruiser laid down 1924
Displacement:
7,844 t light; 8,185 t standard; 9,511 t normal; 10,533 t full load
Loading submergence 620 tons/feet
Dimensions:
574.15 ft x 62.66 ft x 19.69 ft (normal load)
175.00 m x 19.10 m x 6.00 m
Armament:
16 - 6.00" / 152 mm guns (4 Main turrets x 4 guns, 2 superfiring turrets)
8 - 2.56" / 65 mm guns
4 - 1.46" / 37 mm AA guns
Weight of broadside 1,801 lbs / 817 kg
6 - 21.0" / 533.4 mm above water torpedoes
Armour:
Belt 2.76" / 70 mm, ends unarmoured
Belts cover 109 % of normal area
Main turrets 1.97" / 50 mm
Armour deck 1.18" / 30 mm, Conning tower 2.76" / 70 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 80,000 shp / 59,680 Kw = 31.73 kts
32.69knts at light displacement
Range 5,000nm at 20.00 kts
Complement:
481 - 625
Cost:
£2.573 million / $10.294 million
Distribution of weights at normal displacement:
Armament: 225 tons, 2.4 %
Armour: 1,162 tons, 12.2 %
Belts: 439 tons, 4.6 %, Armament: 222 tons, 2.3 %, Armour Deck: 474 tons, 5.0 %
Conning Tower: 27 tons, 0.3 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 2,635 tons, 27.7 %
Hull, fittings & equipment: 3,798 tons, 39.9 %
Fuel, ammunition & stores: 1,666 tons, 17.5 %
Miscellaneous weights: 25 tons, 0.3 %
Metacentric height 3.3
Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.17
Shellfire needed to sink: 9,648 lbs / 4,376 Kg = 89.3 x 6.0 " / 152 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1.4
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.41
Relative quality as seaboat: 1.06
Hull form characteristics:
Block coefficient: 0.470
Sharpness coefficient: 0.33
Hull speed coefficient 'M': 8.29
'Natural speed' for length: 23.96 kts
Power going to wave formation at top speed: 56 %
Trim: 66
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 108.6 %
Relative accommodation and working space: 142.2 %
(Average = 100%)
Displacement factor: 115 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.97
(Structure weight / hull surface area: 107 lbs / square foot or 524 Kg / square metre)
Relative longitudinal hull strength: 1.34
(for 18.70 ft / 5.70 m average freeboard, freeboard adjustment 3.71 ft)
Relative composite hull strength: 1.00