Ships in Class
Diana Layed down 1933
Orsa Layed down 1933
Pegaso Layed down 1933
Orione Layed down 1933
Displacement:
1,538 t light; 1,646 t standard; 2,331 t normal; 2,879 t full load
Dimensions: Length overall / water x beam x draught
375.52 ft / 360.89 ft x 39.37 ft x 11.48 ft (normal load)
114.46 m / 110.00 m x 12.00 m x 3.50 m
Armament:
4 - 5.31" / 135 mm guns (2x2 guns), 79.37lbs / 36.00kg shells, 1933 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 1.85" / 47.0 mm guns (1x4 guns), 3.86lbs / 1.75kg shells, 1933 Model
Anti-aircraft guns in deck mount
on centreline aft
24 - 0.98" / 25.0 mm guns (6x4 guns), 0.53lbs / 0.24kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 346 lbs / 157 kg
Shells per gun, main battery: 300
4 - 17.7" / 450 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -
- Conning tower: 0.79" / 20 mm
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 8,000 shp / 5,968 Kw = 21.75 kts
Range 14,200nm at 15.00 kts
Bunker at max displacement = 1,233 tons
Complement:
167 - 218
Cost:
£0.570 million / $2.279 million
Distribution of weights at normal displacement:
Armament: 41 tons, 1.7 %
Armour: 13 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 10 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.1 %
Machinery: 233 tons, 10.0 %
Hull, fittings & equipment: 1,192 tons, 51.1 %
Fuel, ammunition & stores: 793 tons, 34.0 %
Miscellaneous weights: 60 tons, 2.6 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,939 lbs / 3,601 Kg = 105.8 x 5.3 " / 135 mm shells or 2.1 torpedoes
Stability (Unstable if below 1.00): 1.22
Metacentric height 1.8 ft / 0.5 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle, low quarterdeck
and transom stern
Block coefficient: 0.500
Length to Beam Ratio: 9.17 : 1
'Natural speed' for length: 21.83 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.17 ft / 9.50 m
- Forecastle (20 %): 22.97 ft / 7.00 m (18.04 ft / 5.50 m aft of break)
- Mid (50 %): 18.04 ft / 5.50 m
- Quarterdeck (13 %): 9.84 ft / 3.00 m (18.04 ft / 5.50 m before break)
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 18.62 ft / 5.68 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 51.4 %
- Above water (accommodation/working, high = better): 174.6 %
Waterplane Area: 9,845 Square feet or 915 Square metres
Displacement factor (Displacement / loading): 270 %
Structure weight / hull surface area: 62 lbs/sq ft or 303 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 4.70
- Overall: 1.05
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
15t = quad 47mm
9t=sonar
7t=scaricabombe
10t=asw mortar + 6ton reloads
250hp creeping motors = 9t 28hp/ton
4t = 4x450mm silurotto
Speed with electric motors = 8 knts
Originaly by Red Admiral