A large destroyer that grew out of the previous Soldati Class. Their gun armament of 4x135/45 was thought by some to be insufficient for surface action. The Impavido Class used an enlarged hull and mounted 6x135/45. The greater hull size and freeboard gave better performance in a seaway. The Anti-Aircraft armament was increased with the duple 25mm mountings being replaced by duple 37/54 mounts. Two San Giorgio directors were carried on top of the bridge and aft of the 2nd funnel. The anti-submarine armament remained the same with 4x430mm projectors and two scaricabombe aft with 48 charges. 2 Diesel generator sets were mounted above the waterline for continued electrical power in the event of a torpedo hit.
4 examples were laid down in 1933.
Displacement:
2,094 t light; 2,231 t standard; 2,644 t normal; 2,975 t full load
Dimensions: Length overall / water x beam x draught
407.13 ft / 393.70 ft x 42.65 ft x 13.78 ft (normal load)
124.09 m / 120.00 m x 13.00 m x 4.20 m
Armament:
6 - 5.31" / 135 mm guns (3x2 guns), 70.55lbs / 32.00kg shells, 1933 Model
Breech loading guns in deck mounts with hoists
on centreline ends, majority forward, 2 raised mounts - superfiring
8 - 1.46" / 37.0 mm guns (2x4 guns), 1.83lbs / 0.83kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, all aft, all raised mounts - superfiring
20 - 1.46" / 37.0 mm guns (10x2 guns), 1.83lbs / 0.83kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 475 lbs / 215 kg
Shells per gun, main battery: 300
8 - 23.6" / 600 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.42" / 36 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm 0.39" / 10 mm -
4th: 0.39" / 10 mm - -
- Conning tower: 1.42" / 36 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 40,000 shp / 29,840 Kw = 32.94 kts
Range 4,000nm at 20.00 kts
Bunker at max displacement = 743 tons
Complement:
183 - 239
Cost:
£1.329 million / $5.317 million
Distribution of weights at normal displacement:
Armament: 62 tons, 2.3 %
Armour: 25 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 19 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 6 tons, 0.2 %
Machinery: 1,115 tons, 42.2 %
Hull, fittings & equipment: 835 tons, 31.6 %
Fuel, ammunition & stores: 551 tons, 20.8 %
Miscellaneous weights: 57 tons, 2.2 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,051 lbs / 477 Kg = 14.0 x 5.3 " / 135 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.35
Metacentric height 2.4 ft / 0.7 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.43
Seaboat quality (Average = 1.00): 1.20
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 9.23 : 1
'Natural speed' for length: 23.11 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 27.89 ft / 8.50 m
- Forecastle (15 %): 21.33 ft / 6.50 m
- Mid (53 %): 21.33 ft / 6.50 m (13.12 ft / 4.00 m aft of break)
- Quarterdeck (10 %): 13.12 ft / 4.00 m
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 17.86 ft / 5.45 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 158.3 %
- Above water (accommodation/working, high = better): 152.9 %
Waterplane Area: 10,727 Square feet or 997 Square metres
Displacement factor (Displacement / loading): 91 %
Structure weight / hull surface area: 42 lbs/sq ft or 206 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.03
- Overall: 0.57
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily
20t = 2 x 37mm quadruple mounts
16t = 8 x 600mm TT
9t= SONAR
7t= scaricabombe
5t=diesel genset
=57t
150x28kg HE Shells
150x36kg SAP Shells