Iberia BB1912

[miketr]

OK this is the end of the road for a pure BB design.  

As to HMS Hood, I have never been a fan of RN warships, their cordite track record of stability was way to low.  Far too many RN Cruisers (armored and battle) and a few battleships had their last moments noted by a massive explosion.  Hoods armor layout wasn't the greatest, being over weight was worse but her powder mags were a ticking time bomb.  One theory, not a likely one mind you, had Hood destroyed by one of Prinz Eugen's 8" HE rounds setting off a fire that spread to the 4" mags and or torpedo's setting off the chain reaction explosion.  Armor is important its even more important that your own munitions have a enough of a saftey margin that they don't kill you when any fire gets into the ammo system.

Michael

BB-1912b, Iberia Battleship laid down 1912

Displacement:
   23,000 t light; 24,240 t standard; 25,660 t normal; 26,796 t full load

Dimensions: Length overall / water x beam x draught
   550.00 ft / 550.00 ft x 93.00 ft x 27.00 ft (normal load)
   167.64 m / 167.64 m x 28.35 m  x 8.23 m

Armament:
      10 - 12.99" / 330 mm guns (5x2 guns), 1,096.51lbs / 497.37kg shells, 1912 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, majority forward, 2 raised mounts - superfiring
      16 - 5.91" / 150 mm guns in single mounts, 102.98lbs / 46.71kg shells, 1912 Model
     Breech loading guns in casemate mounts
     on side, all amidships
      8 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1912 Model
     Breech loading guns in deck mounts
     on side, evenly spread, all raised mounts
      8 - 1.97" / 50.0 mm guns in single mounts, 3.81lbs / 1.73kg shells, 1912 Model
     Breech loading guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 12,746 lbs / 5,782 kg
   Shells per gun, main battery: 100
   4 - 20.0" / 508 mm submerged torpedo tubes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.0" / 330 mm   350.00 ft / 106.68 m   12.00 ft / 3.66 m
   Ends:   4.00" / 102 mm   200.00 ft / 60.96 m   12.00 ft / 3.66 m
   Upper:   4.00" / 102 mm   350.00 ft / 106.68 m   13.00 ft / 3.96 m
     Main Belt covers 98 % of normal length

   - Torpedo Bulkhead:
      1.50" / 38 mm   350.00 ft / 106.68 m   25.92 ft / 7.90 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   13.0" / 330 mm   9.00" / 229 mm      13.0" / 330 mm
   2nd:   4.00" / 102 mm         -               -

   - Armour deck: 2.50" / 64 mm, Conning tower: 13.00" / 330 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 44,000 shp / 32,824 Kw = 22.56 kts
   Range 8,000nm at 10.00 kts
   Bunker at max displacement = 2,557 tons (67% coal)

Complement:
   1,013 - 1,317

Cost:
   £2.405 million / $9.620 million

Distribution of weights at normal displacement:
   Armament: 1,593 tons, 6.2 %
   Armour: 9,480 tons, 36.9 %
      - Belts: 3,599 tons, 14.0 %
      - Torpedo bulkhead: 503 tons, 2.0 %
      - Armament: 3,321 tons, 12.9 %
      - Armour Deck: 1,813 tons, 7.1 %
      - Conning Tower: 244 tons, 0.9 %
   Machinery: 1,868 tons, 7.3 %
   Hull, fittings & equipment: 9,559 tons, 37.3 %
   Fuel, ammunition & stores: 2,660 tons, 10.4 %
   Miscellaneous weights: 500 tons, 1.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     33,131 lbs / 15,028 Kg = 30.2 x 13.0 " / 330 mm shells or 5.2 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 5.3 ft / 1.6 m
   Roll period: 17.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.66
   Seaboat quality  (Average = 1.00): 1.22

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.650
   Length to Beam Ratio: 5.91 : 1
   'Natural speed' for length: 23.45 kts
   Power going to wave formation at top speed: 51 %
   Trim (Max stability = 0, Max steadiness = 100): 41
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      26.00 ft / 7.92 m
      - Forecastle (20 %):   23.00 ft / 7.01 m
      - Mid (50 %):      19.00 ft / 5.79 m
      - Quarterdeck (15 %):   19.00 ft / 5.79 m
      - Stern:      19.00 ft / 5.79 m
      - Average freeboard:   20.64 ft / 6.29 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 95.6 %
      - Above water (accommodation/working, high = better): 146.8 %
   Waterplane Area: 39,195 Square feet or 3,641 Square metres
   Displacement factor (Displacement / loading): 97 %
   Structure weight / hull surface area: 178 lbs/sq ft or 868 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.94
      - Longitudinal: 1.63
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent
   Good seaboat, rides out heavy weather easily

Edit: Increased the turrets armor a bit and shortened the belt.

[Carthaginian]

VERY nice, Mike.
You've got more firepower and better speed than I do on the same tonnage in my Oklahoma class. Excellent balance, good ship. Were Iberia looking for a good ship, I don't think they could build a better one.

[miketr]

Thanks Carthaginian for the comment.  I am debating building both the AC and BB designs; two of each design.

The AC's would need 23.5 BP and the BB 23 BP.  The BB is also small enough to fit in a type 2 slipway; a whole 7 feet to spare. 

If I put 3 BP into each a half it would take them 4 years to finish the four of them BUT it would tie up my entire build strength for that time period.  If I import the engines, I could shave half a year off the build schedule.  Of course in 1915 I would then be faced with the problem of building two more BB's at once to create at least a single squadron of modern BB's.  A nice thought but again to much to do and to little to do it with.

Michael