Cross Mirage

[Valles]

Published: ~30,000 tons light, 20kts and 5,000 nm at 12kts, 5x2x38cm w/ 345mm vertical belt and 100mm deck of +10% quality

Actual:
Cross Mirage (AON), Maoria Battleship laid down 1915 (Engine 1912)

Displacement:
   33,368 t light; 35,826 t standard; 39,638 t normal; 42,687 t full load

Dimensions: Length overall / water x beam x draught
   614.89 ft / 606.96 ft x 101.71 ft x 32.81 ft (normal load)
   187.42 m / 185.00 m x 31.00 m  x 10.00 m

Armament:
     10 - 14.96" / 380 mm guns (5x2 guns), 1,763.70lbs / 800.00kg shells, 1915 Model
     Breech loading guns in turrets (on barbettes)
     on centreline, evenly spread, 2 raised mounts
     16 - 5.91" / 150 mm guns (8x2 guns), 110.23lbs / 50.00kg shells, 1915 Model
     Quick firing guns in deck mounts with hoists
     on side ends, evenly spread
     16 - 2.95" / 75.0 mm guns (8x2 guns), 13.23lbs / 6.00kg shells, 1915 Model
     Quick firing guns in deck mounts with hoists
     on side ends, evenly spread, all raised mounts - superfiring
   Weight of broadside 19,612 lbs / 8,896 kg
   Shells per gun, main battery: 150

Armour:
  - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   15.0" / 380 mm   424.87 ft / 129.50 m   18.86 ft / 5.75 m
   Ends:   Unarmoured
     Main Belt covers 108 % of normal length

  - Torpedo Bulkhead:
      2.95" / 75 mm   424.87 ft / 129.50 m   31.04 ft / 9.46 m

  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.0" / 380 mm   11.8" / 300 mm      15.0" / 380 mm
   2nd:   5.91" / 150 mm   3.94" / 100 mm      1.97" / 50 mm
   3rd:   1.97" / 50 mm   0.98" / 25 mm      1.97" / 50 mm

  - Armour deck: 4.72" / 120 mm, Conning tower: 14.96" / 380 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 35,181 shp / 26,245 Kw = 20.00 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 6,861 tons

Complement:
   1,403 - 1,825

Cost:
   £4.825 million / $19.298 million

Distribution of weights at normal displacement:
   Armament: 2,325 tons, 5.9 %
   Armour: 15,508 tons, 39.1 %
      - Belts: 5,228 tons, 13.2 %
      - Torpedo bulkhead: 1,441 tons, 3.6 %
      - Armament: 4,198 tons, 10.6 %
      - Armour Deck: 4,267 tons, 10.8 %
      - Conning Tower: 375 tons, 0.9 %
   Machinery: 1,403 tons, 3.5 %
   Hull, fittings & equipment: 12,633 tons, 31.9 %
   Fuel, ammunition & stores: 6,269 tons, 15.8 %
   Miscellaneous weights: 1,500 tons, 3.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     52,929 lbs / 24,008 Kg = 31.6 x 15.0 " / 380 mm shells or 9.8 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 6.1 ft / 1.9 m
   Roll period: 17.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 52 %
         - Recoil effect (Restricted arc if above 1.00): 0.58
   Seaboat quality  (Average = 1.00): 1.26

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.685
   Length to Beam Ratio: 5.97 : 1
   'Natural speed' for length: 24.64 kts
   Power going to wave formation at top speed: 44 %
   Trim (Max stability = 0, Max steadiness = 100): 41
   Bow angle (Positive = bow angles forward): 4.00 degrees
   Stern overhang: 6.56 ft / 2.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      19.69 ft / 6.00 m
      - Forecastle (15 %):   16.40 ft / 5.00 m
      - Mid (50 %):      16.40 ft / 5.00 m
      - Quarterdeck (15 %):   16.40 ft / 5.00 m
      - Stern:      16.40 ft / 5.00 m
      - Average freeboard:   16.60 ft / 5.06 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 77.0 %
      - Above water (accommodation/working, high = better): 108.7 %
   Waterplane Area: 48,818 Square feet or 4,535 Square metres
   Displacement factor (Displacement / loading): 103 %
   Structure weight / hull surface area: 195 lbs/sq ft or 952 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.37
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is excellent
   Room for accommodation and workspaces is adequate
   Good seaboat, rides out heavy weather easily

900 tons barbette reinforcement
250 tons battleship fire control
125 tons damage control
100 tons 10-bed hospital
75 tons flagship appointments
50 tons climate control

Main belt is +10% quality and sloped 15 degrees.

3x 25mm torpedo bulkheads, each inboard of a 1.5m fluid void and a 1.5m air void and one layer inboard of the other

[Jefgte]

With the numbers
- armour
- armament
- BC
- draught
- ...

She is certainly about 38.000 - 40.000t


;)

[Valles]

She puts on about ten thousand tons when she's loaded, yeah, but that comes out of the operations budget, not construction.

[Guinness]

Very nice effort on the artwork. Are those roll down doors amidships for boats possibly?

The one criticism I have is the mastwork. I like that you tried for something distinctive for your ship, but I suspect that the latticework masts would likely have been much heavier than necessary for the weights they are carrying. Such masks didn't really come into style in our timeline until the need to carry radar up high came along.

The tertiary armament in turrets is also an interesting choice. I understand the the thinking there (especially with the decks space issues of all those guns on board and the potential blast interference). I wonder though if those turrets might not have trouble tracking their intended targets quickly enough.

Please don't take this comments as anything else but the most well meaning constructive criticism however. She is otherwise splendidly belligerent looking, especially her bow with that paint scheme.

And the CSA is probably most interested in Maori thoughts on barbette reinforcements. :) I may have mistakenly understood that you were adopting the CSA 15" gun, which is a true 15" (381 mm), not a 380 mm gun. If Maoria developed it's own, that's cool, I'm happy to see Confederate ideas on turret design finding other adherents.

Oh and for other readers: Valles' illustration is actually a lot bigger (1231 by 762 pixels), so if you want to get a better look at her, I recommending opening just the image in your browser or downloading it.

[Valles]

The doors amidships are indeed for ship's boats, yes. Once I decided to move the 75s up from their original hull casements there really wasn't anyplace else I could put them that wasn't in the way of one or the other of the turrets.

The mast design I selected, oh, way back when I started playing, based on the memory that the USN's cage masts, as bulky as they looked, were actually lighter than the RN's tripod designs. The Maori setup is essentially intended to be strong only against the compression and weight of the equipment atop it; lateral stability comes from the wire stays that I once again forgot to draw. ^_^;; (along with spotlights, argh.)

The 75s might well end up being found to be too cramped in actual service; I've been eyeballing them to replace each pair with an additional twin 150 turret (total of four new)... but that won't be for a couple of years until after she's done either way.

The main guns... um, argh. The one millimeter difference in bore could easily just be the use of a marginally thicker liner, but the shell design...

Hm. Welp, I'm waiting for the armor tech to be ready anyway, there may end up being time to get a new gun ready first.

[Borys]

Ahoj!
I like the Chubby Lady!
Borys

[Tanthalas]

42 months to build... not worth it imho

[Borys]

Thanks for the tip in opening image only.
Borys

[Guinness]

42 months to build... not worth it imho

I don't think time to build is necessarily a reason not to build a ship like this. To whit: an 8x15" BB with reasonable protection and stability is going to displace at least 28,000 tons (at least built to confederate standards). That's a 37 month ship, so in practical terms, probably a 39 month or 42 month ship. So 10x15" in 42 months is reasonable.

To get under 42 months build time, you'll either accept less barrels, smaller caliber, or less protection. Taking less speed than 20 or 21 knots probably won't help you all that much either. At least in my recent experience working on 15" and larger armed ships, it seems the hull size is dictated more by stability requirements than speed, at least up until about 23 knots or so.

For the Maori, the choice is likely something to the extent of building 2 18,000 ton ships, or one 34,000 ton ship. You can build two pretty nice 13.5" armed 18,000 tonners, that's true, but they will be completely outgunned by a 15" armed ship.

[Valles]

Updated with the armor layout - I blame Korpen.