WesWorld

Actively serving experimental ships of the Marina Militare.

The Pisa Class cruiser Coatit was refitted to take the prototypes of the 152mm automatic turret.

Coatit Conversion, Italian Light Cruiser laid down 1924 (Converted 1943)

Displacement:
7,722 t light; 8,205 t standard; 9,511 t normal; 10,556 t full load

Dimensions: Length overall / water x beam x draught
578.20 ft / 574.15 ft x 62.66 ft x 19.69 ft (normal load)
176.23 m / 175.00 m x 19.10 m x 6.00 m

Armament:
12 - 5.98" / 152 mm guns (4x3 guns), 107.15lbs / 48.60kg shells, 1943 Model
Automatic rapid fire guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
12 - 1.46" / 37.0 mm guns (6x2 guns), 1.55lbs / 0.70kg shells, 1943 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 1,304 lbs / 592 kg
Shells per gun, main battery: 400

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.94" / 100 mm 373.33 ft / 113.79 m 9.51 ft / 2.90 m
Ends: Unarmoured
Main Belt covers 100 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.31" / 135 mm 2.76" / 70 mm 2.76" / 70 mm

- Armour deck: 1.57" / 40 mm, Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 72,000 shp / 53,712 Kw = 30.92 kts
Range 5,000nm at 20.00 kts
Bunker at max displacement = 2,352 tons

Complement:
481 - 626

Cost:
£2.368 million / $9.473 million

Distribution of weights at normal displacement:
Armament: 195 tons, 2.1 %
Armour: 1,582 tons, 16.6 %
- Belts: 585 tons, 6.2 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 290 tons, 3.0 %
- Armour Deck: 680 tons, 7.1 %
- Conning Tower: 27 tons, 0.3 %
Machinery: 2,372 tons, 24.9 %
Hull, fittings & equipment: 3,533 tons, 37.1 %
Fuel, ammunition & stores: 1,789 tons, 18.8 %
Miscellaneous weights: 40 tons, 0.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
11,064 lbs / 5,018 Kg = 103.3 x 6.0 " / 152 mm shells or 1.6 torpedoes
Stability (Unstable if below 1.00): 1.17
Metacentric height 3.3 ft / 1.0 m
Roll period: 14.5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.29
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.470
Length to Beam Ratio: 9.16 : 1
'Natural speed' for length: 23.96 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 69
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.97 ft / 7.00 m
- Forecastle (17 %): 21.33 ft / 6.50 m
- Mid (50 %): 21.33 ft / 6.50 m (11.48 ft / 3.50 m aft of break)
- Quarterdeck (17 %): 11.48 ft / 3.50 m
- Stern: 11.48 ft / 3.50 m
- Average freeboard: 16.52 ft / 5.03 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 99.4 %
- Above water (accommodation/working, high = better): 151.6 %
Waterplane Area: 23,340 Square feet or 2,168 Square metres
Displacement factor (Displacement / loading): 120 %
Structure weight / hull surface area: 101 lbs/sq ft or 493 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.11
- 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