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NB Ignore MM Aries for the time being
MM Astraea, Italian Escort Cruiser laid down 1921
Displacement:
8,001 t light; 8,525 t standard; 10,226 t normal; 11,547 t full load
Loading submergence 627 tons/feet
Dimensions:
505.00 ft x 58.00 ft x 18.80 ft (normal load)
153.92 m x 17.68 m x 5.73 m
Armament:
6 - 10.00" / 254 mm guns (3 Main turrets x 2 guns, 1 superfiring turret)
Superfiring turret is aft
Aft turrets separated by engine room
12 - 5.12" / 130 mm guns (6 2nd turrets x 2 guns)
12 - 1.59" / 41 mm AA guns
Weight of broadside 3,830 lbs / 1,737 kg
Armour:
Belt 5.91" / 150 mm, ends unarmoured
Belts cover 72 % of normal area
Main turrets 5.91" / 150 mm, 2nd turrets 1.97" / 50 mm
AA gun shields 0.04" / 1 mm
Armour deck 3.15" / 80 mm, Conning tower 2.95" / 75 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 31,342 shp / 23,381 Kw = 24.00 kts
Range 11,500nm at 15.00 kts
Complement:
508 - 661
Cost:
£2.121 million / $8.484 million
Distribution of weights at normal displacement:
Armament: 479 tons, 4.7 %
Armour: 2,603 tons, 25.5 %
Belts: 531 tons, 5.2 %, Armament: 763 tons, 7.5 %, Armour Deck: 1,279 tons, 12.5 %
Conning Tower: 30 tons, 0.3 %, Torpedo bulkhead: 0 tons, 0.0 %
Machinery: 1,079 tons, 10.6 %
Hull, fittings & equipment: 3,740 tons, 36.6 %
Fuel, ammunition & stores: 2,225 tons, 21.8 %
Miscellaneous weights: 100 tons, 1.0 %
Metacentric height 2.4
Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is excellent
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.05
Shellfire needed to sink: 13,956 lbs / 6,331 Kg = 27.9 x 10.0 " / 254 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2.1
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 67 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.92
Relative quality as seaboat: 1.11
Hull form characteristics:
Block coefficient: 0.650
Sharpness coefficient: 0.40
Hull speed coefficient 'M': 7.12
'Natural speed' for length: 22.47 kts
Power going to wave formation at top speed: 51 %
Trim: 60
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 72.0 %
Relative accommodation and working space: 123.4 %
(Average = 100%)
Displacement factor: 118 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.99
(Structure weight / hull surface area: 116 lbs / square foot or 566 Kg / square metre)
Relative longitudinal hull strength: 1.17
(for 15.00 ft / 4.57 m average freeboard, freeboard adjustment -0.21 ft)
Relative composite hull strength: 1.01