Italia-1906-BB Final

[Tanthalas]

Having finally arrived at a design that the Admiralty could agree upon the RM is happy to present the final form for RM-BB-1906.



Italia-BB-1906, Italia Light Battle Ship laid down 1906 (Engine 1905)

Displacement:
   15,557 t light; 16,447 t standard; 19,461 t normal; 21,873 t full load

Dimensions: Length overall / water x beam x draught
   515.80 ft / 510.00 ft x 65.65 ft (Bulges 77.65 ft) x 25.00 ft (normal load)
   157.22 m / 155.45 m x 20.01 m (Bulges 23.67 m)  x 7.62 m

Armament:
      9 - 12.00" / 305 mm guns (3x3 guns), 864.00lbs / 391.90kg shells, 1905 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1905 Model
     Quick firing guns in casemate mounts
     on side, all amidships
      2 - 3.00" / 76.2 mm guns (1x2 guns), 13.50lbs / 6.12kg shells, 1905 Model
     Quick firing guns in a deck mount with hoist
     on centreline aft, all raised guns - superfiring
      16 - 0.75" / 19.1 mm guns (8x2 guns), 0.21lbs / 0.10kg shells, 1905 Model
     Breech loading guns in deck mounts
     on side, evenly spread
   Weight of broadside 8,806 lbs / 3,994 kg
   Shells per gun, main battery: 100
   2 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   11.0" / 279 mm   376.28 ft / 114.69 m   12.00 ft / 3.66 m
   Ends:   6.00" / 152 mm   133.70 ft / 40.75 m   12.00 ft / 3.66 m
   Upper:   6.00" / 152 mm   376.28 ft / 114.69 m   8.00 ft / 2.44 m
     Main Belt covers 114 % of normal length

   - Torpedo Bulkhead and Bulges:
      1.00" / 25 mm   376.28 ft / 114.69 m   24.24 ft / 7.39 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   11.0" / 279 mm   6.00" / 152 mm      10.0" / 254 mm
   2nd:   2.00" / 51 mm   1.00" / 25 mm            -
   3rd:   1.00" / 25 mm   1.00" / 25 mm            -

   - Armour deck: 2.00" / 51 mm, Conning tower: 10.00" / 254 mm

Machinery:
   Coal fired boilers, steam turbines,
   Direct drive, 4 shafts, 23,775 shp / 17,736 Kw = 20.00 kts
   Range 5,000nm at 15.00 kts
   Bunker at max displacement = 5,425 tons (100% coal)

Complement:
   823 - 1,071

Cost:
   £1.747 million / $6.986 million

Distribution of weights at normal displacement:
   Armament: 1,101 tons, 5.7 %
   Armour: 6,090 tons, 31.3 %
      - Belts: 3,203 tons, 16.5 %
      - Torpedo bulkhead: 337 tons, 1.7 %
      - Armament: 1,411 tons, 7.3 %
      - Armour Deck: 982 tons, 5.0 %
      - Conning Tower: 156 tons, 0.8 %
   Machinery: 1,981 tons, 10.2 %
   Hull, fittings & equipment: 6,135 tons, 31.5 %
   Fuel, ammunition & stores: 3,904 tons, 20.1 %
   Miscellaneous weights: 250 tons, 1.3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     20,377 lbs / 9,243 Kg = 23.6 x 12.0 " / 305 mm shells or 3.4 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 3.2 ft / 1.0 m
   Roll period: 18.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.73
   Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.688
   Length to Beam Ratio: 6.57 : 1
   'Natural speed' for length: 22.58 kts
   Power going to wave formation at top speed: 46 %
   Trim (Max stability = 0, Max steadiness = 100): 56
   Bow angle (Positive = bow angles forward): 9.00 degrees
   Stern overhang: 2.00 ft / 0.61 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      24.00 ft / 7.32 m
      - Forecastle (13 %):   15.00 ft / 4.57 m
      - Mid (50 %):      15.00 ft / 4.57 m
      - Quarterdeck (13 %):   15.00 ft / 4.57 m
      - Stern:      15.00 ft / 4.57 m
      - Average freeboard:   15.47 ft / 4.72 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 113.5 %
      - Above water (accommodation/working, high = better): 92.2 %
   Waterplane Area: 26,549 Square feet or 2,467 Square metres
   Displacement factor (Displacement / loading): 102 %
   Structure weight / hull surface area: 151 lbs/sq ft or 735 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.23
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is adequate
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

fixed main belt issue

[Borys]

Ahoj!
Maybe make the ends thinner, and extend the main belt to hide the Main Battery magazines?

Borys

[Tanthalas]

grrrrr ss is messin with me again i set main belt to minimum for mag and eng coverage... >< fixed it btw