Empire of Italia PC -1917

[ctwaterman]

With the advent of fast and larger Armored Cruisers and Battle Cruisers the job of Fleet Scout or Scout Cruiser could no longer be carried out by existing Italia Cruisers.  With the Empire desire for float plane scout still a dream  on some drawing board an inexpensive Fast Fleet Scout was needed.  The plan was for a fast ship utilizing an all or nothing Armor Design to be able to resist the fire of other Protected Cruiser or to have enought speed to simply run from most if not all Battle Cruisers to this end speed and an above average sea keeping were primary goals.


Corsica, Empire of Italia Protected Cruiser laid down 1917 (Engine 1916)

Displacement:
   7,000 t light; 7,239 t standard; 8,309 t normal; 9,166 t full load

Dimensions: Length overall / water x beam x draught
   535.00 ft / 535.00 ft x 48.00 ft x 21.99 ft (normal load)
   163.07 m / 163.07 m x 14.63 m  x 6.70 m

Armament:
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1916 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      8 - 0.98" / 25.0 mm guns (2x4 guns), 0.48lbs / 0.22kg shells, 1917 Model
     Breech loading guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 868 lbs / 394 kg
   Shells per gun, main battery: 150
   12 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.27" / 58 mm   474.00 ft / 144.48 m   11.32 ft / 3.45 m
   Ends:   Unarmoured
     Main Belt covers 136 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.00" / 102 mm   2.00" / 51 mm            -

   - Armour deck: 1.25" / 32 mm, Conning tower: 4.00" / 102 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 78,038 shp / 58,216 Kw = 32.00 kts
   Range 8,500nm at 14.00 kts
   Bunker at max displacement = 1,927 tons

Complement:
   434 - 565

Cost:
   £1.351 million / $5.405 million

Distribution of weights at normal displacement:
   Armament: 108 tons, 1.3 %
   Armour: 1,008 tons, 12.1 %
      - Belts: 482 tons, 5.8 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 89 tons, 1.1 %
      - Armour Deck: 401 tons, 4.8 %
      - Conning Tower: 35 tons, 0.4 %
   Machinery: 2,908 tons, 35.0 %
   Hull, fittings & equipment: 2,726 tons, 32.8 %
   Fuel, ammunition & stores: 1,309 tons, 15.8 %
   Miscellaneous weights: 250 tons, 3.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5,456 lbs / 2,475 Kg = 50.5 x 6.0 " / 152 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 14.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.51
   Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.515
   Length to Beam Ratio: 11.15 : 1
   'Natural speed' for length: 23.13 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 64
   Bow angle (Positive = bow angles forward): -5.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      24.54 ft / 7.48 m
      - Forecastle (20 %):   17.19 ft / 5.24 m
      - Mid (50 %):      17.19 ft / 5.24 m
      - Quarterdeck (15 %):   17.19 ft / 5.24 m
      - Stern:      17.19 ft / 5.24 m
      - Average freeboard:   17.78 ft / 5.42 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 126.8 %
      - Above water (accommodation/working, high = better): 88.7 %
   Waterplane Area: 17,347 Square feet or 1,612 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 85 lbs/sq ft or 416 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.57
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

24T 12 x 2 Ton Torps
100 Fire Control
25T Search Lights and Night Fighting Equipment
101T Mines and Mine Laying Equipment
Inclined Belt

[Guinness]

If my math is right, and we assume that your belt is sloped at 15 degrees, it's only going to protect 3.32 meters (10.8 feet) at the waterline. IMHO, that's way too short for a 32 knot ship. I believe the unarmored side would be exposed below the waterline quite easily at speed.

[ctwaterman]

Someone else mentioned that as well so I expanded the belt 2 feet.  I figured a 10 Degree Incline but yes I will see how much I can stretch the belt.  What do you gifure is the need Belt size :)

[ctwaterman]

A version my Ally Requested using CSA 5.5" 75 Lb Guns


Corsica, Empire of Italia Protected Cruiser laid down 1917 (Engine 1916)

Displacement:
   7,152 t light; 7,389 t standard; 8,471 t normal; 9,336 t full load

Dimensions: Length overall / water x beam x draught
   535.00 ft / 535.00 ft x 48.00 ft x 21.99 ft (normal load)
   163.07 m / 163.07 m x 14.63 m  x 6.70 m

Armament:
      8 - 5.50" / 140 mm guns (4x2 guns), 75.00lbs / 34.02kg shells, 1916 Model
     Breech loading guns in deck mounts with hoists
     on centreline ends, evenly spread, 2 raised mounts - superfiring
      8 - 0.98" / 25.0 mm guns (2x4 guns), 0.48lbs / 0.22kg shells, 1917 Model
     Breech loading guns in deck mounts
     on side, all amidships, all raised mounts - superfiring
   Weight of broadside 604 lbs / 274 kg
   Shells per gun, main battery: 200
   12 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.50" / 64 mm   450.00 ft / 137.16 m   15.00 ft / 4.57 m
   Ends:   Unarmoured
     Main Belt covers 129 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.00" / 102 mm   2.00" / 51 mm            -

   - Armour deck: 1.25" / 32 mm, Conning tower: 4.00" / 102 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 79,318 shp / 59,171 Kw = 32.00 kts
   Range 8,500nm at 14.00 kts
   Bunker at max displacement = 1,948 tons

Complement:
   440 - 573

Cost:
   £1.335 million / $5.340 million

Distribution of weights at normal displacement:
   Armament: 84 tons, 1.0 %
   Armour: 1,194 tons, 14.1 %
      - Belts: 673 tons, 7.9 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 80 tons, 0.9 %
      - Armour Deck: 405 tons, 4.8 %
      - Conning Tower: 36 tons, 0.4 %
   Machinery: 2,955 tons, 34.9 %
   Hull, fittings & equipment: 2,669 tons, 31.5 %
   Fuel, ammunition & stores: 1,319 tons, 15.6 %
   Miscellaneous weights: 250 tons, 3.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5,817 lbs / 2,639 Kg = 69.9 x 5.5 " / 140 mm shells or 0.9 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 14.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.35
   Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.525
   Length to Beam Ratio: 11.15 : 1
   'Natural speed' for length: 23.13 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 65
   Bow angle (Positive = bow angles forward): -5.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      24.54 ft / 7.48 m
      - Forecastle (20 %):   17.19 ft / 5.24 m
      - Mid (50 %):      17.19 ft / 5.24 m
      - Quarterdeck (15 %):   17.19 ft / 5.24 m
      - Stern:      17.19 ft / 5.24 m
      - Average freeboard:   17.78 ft / 5.42 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 124.2 %
      - Above water (accommodation/working, high = better): 88.3 %
   Waterplane Area: 17,508 Square feet or 1,627 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 83 lbs/sq ft or 405 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.53
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is cramped
   Ship has slow, easy roll, a good, steady gun platform

24T 12 x 2 Ton Torps
100 Fire Control
25T Search Lights and Night Fighting Equipment
101T Mines and Mine Laying Equipment
Belt Inclined

[The Rock Doctor]

From a different perspective - does the inclined belt have much impact on the available internal space within the ship?  She's not all that wide to start with.

[Guinness]

Someone who's actually good at math check me here, but assuming a 15 degree slope and a 15 foot belt, I get 3.88 feet extra depth (not accounting for the thickness though, so let's just say 4 feet). So a total of 8 feet lost.

Of course, if it is a sloped internal belt, some of the fuel could go outside it too... Still I think we can expect the machinery spaces to be a little bit extra cramped.

[The Rock Doctor]

Ah, for the days when I remembered trigonometry...

[ctwaterman]

agggh..... the Trigonometry Monster.... run run for the hills up the trees :'(

Ok so maybe we will skip the Slopped Belt armor stick with the All or nothing concept and maybe hope I can pilfer the next generation of armor from say France before the 2nd run of these ships is completed ??? ;D :o

On another note while cleaning up my Naval Guns link horror of horrors It appears I never developed a twin 6" or 152mm Gun.  So I may very well be using a French or CSA 5.5" gun anyway for the first run on these ship  :-[

[Desertfox]

So where's the self destruct button? ;) ;D

[ctwaterman]

So where's the self destruct button? ;) ;D

I had it installed on the your flag ship ;D

[Desertfox]

So I'm getting one of these for free? Sweet!