WesWorld

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

Hmmmm. So is this a CT light cruiser? Tonnage and bore size seem to suggest so...

Yes, she'll be rated as a light cruiser. Then again, Italy has masses of light cruiser tonnage and can transfer 10% of the DD tonnage to this as well.

Heh, wasn't suggesting anything as far as limits go, Germany's doing something similar with the Maas class, just checking on where it was going to be declared (if it mattered, of course).

Other concepts that were examined at the same time. The 1st was rejected for being too large and expensive. The 2nd was a simple growth of the Soldati with a 47mm mount aft. The 3rd was a larger and faster Soldati class but felt to be too light on armament for its size.

It seems that stability would be increased if there were 2 turrets aft/1 forward.
With a raised focsle and superimposed turrets you get a lot of weight up high.

That option was considered but rejected for two reasons;

• Seakeeping: The higher your guns are, the more operable they are.
  
  
• Interference with the depth charge racks aft would limit arcs of fire too much.
  

Regarding the main guns, shouldn't there be two raised mounts in the sim?

I think you´re absolutely right.

I thought it was simmed as that already. Obviously not.

Also vessels laid down in 1933, not 1932.

Quoted

Originally posted by Red Admiral
That option was considered but rejected for two reasons;

• Seakeeping: The higher your guns are, the more operable they are.
  
  
• Interference with the depth charge racks aft would limit arcs of fire too much.
  

Higher guns also give you more topweight as well.

The Gearings/Allen M. Sumner's had their guns low aft with depth charge racks and light AA on the stern, I've seen nothing to state any negative effects there (though that doesn't nessassarily mean there wern't issues) , the biggest issues seemed to be more wetness forward than say the Fletchers.

There is more than sufficient beam to deal with topweight. The L and Ms with 4x120mm forwards managed on 11.2m beam.

The issue with the racks is greater here as the scaricabombe racks are quite high. Picture here