Imperial Roman Navy: 1926-1930 Designs

[snip]

Rather than lay down a second armored cruiser in 1928 to make a class of two for the program, there is an alternative proposal to build another aircraft carrier. In effect a stretched Cardinal Richelieu built atop the relative hull form of AC-26, the design can accommodate fifty-seven aircraft [Reduced to forty-eight post-1933, its calculated Airgroup at 4560t] while being fast enough to keep up with the battleships and armored cruisers in a sprint. Its value is seen as providing mobile fighter cover to the battlefleet, rather than as a strike asset.

Francis Drake, Imperial Roman Republic Aircraft Carrier laid down 1928

Displacement:
   18,700 t light; 19,232 t standard; 21,031 t normal; 22,470 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (705.38 ft / 688.99 ft) x 75.46 ft x (22.97 / 24.27 ft)
   (215.00 m / 210.00 m) x 23.00 m  x (7.00 / 7.40 m)

Armament:
      8 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 175 per gun
     Quick firing guns in deck and hoist mounts, 1909 Model
     8 x Single mounts on side ends, evenly spread
      4 - 3.54" / 90.0 mm 50.0 cal guns - 20.94lbs / 9.50kg shells, 250 per gun
     Anti-air guns in deck and hoist mounts, 1926 Model
     2 x Single mounts on sides amidships
      2 raised mounts
     2 x Single mounts on sides amidships
      2 double raised mounts
      16 - 1.10" / 28.0 mm 55.0 cal guns - 0.72lbs / 0.33kg shells, 5,000 per gun
     Anti-air guns in deck and hoist mounts, 1926 Model
     4 x Quad mounts on side ends, evenly spread
      10 - 0.30" / 7.5 mm 66.7 cal guns - 0.01lbs / 0.01kg shells, 15,000 per gun
     Machine guns in deck mounts, 1925 Model
     10 x Single mounts on sides, evenly spread
      Weight of broadside 783 lbs / 355 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.15" / 80 mm   458.73 ft / 139.82 m   16.40 ft / 5.00 m
   Ends:   Unarmoured
     Main Belt covers 102 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.57" / 40 mm   458.73 ft / 139.82 m   21.82 ft / 6.65 m
   Beam between torpedo bulkheads 61.52 ft / 18.75 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm   0.59" / 15 mm      1.97" / 50 mm
   2nd:   0.20" / 5 mm   0.20" / 5 mm      0.59" / 15 mm
   3rd:   0.20" / 5 mm         -         0.59" / 15 mm
   4th:   0.20" / 5 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 1.97" / 50 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.38" / 35 mm

   - Conning towers: Forward 3.15" / 80 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 110,000 shp / 82,060 Kw = 30.44 kts
   Range 10,000nm at 14.00 kts
   Bunker at max displacement = 3,238 tons

Complement:
   873 - 1,135

Cost:
   £4.698 million / $18.793 million

Distribution of weights at normal displacement:
   Armament: 272 tons, 1.3 %
      - Guns: 272 tons, 1.3 %
   Armour: 3,015 tons, 14.3 %
      - Belts: 986 tons, 4.7 %
      - Torpedo bulkhead: 583 tons, 2.8 %
      - Armament: 54 tons, 0.3 %
      - Armour Deck: 1,341 tons, 6.4 %
      - Conning Tower: 52 tons, 0.2 %
   Machinery: 3,425 tons, 16.3 %
   Hull, fittings & equipment: 6,778 tons, 32.2 %
   Fuel, ammunition & stores: 2,331 tons, 11.1 %
   Miscellaneous weights: 5,210 tons, 24.8 %
      - Hull below water: 2,480 tons
      - Hull above water: 2,480 tons
      - On freeboard deck: 200 tons
      - Above deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     37,089 lbs / 16,823 Kg = 443.0 x 5.5 " / 140 mm shells or 4.3 torpedoes
   Stability (Unstable if below 1.00): 1.33
   Metacentric height 5.5 ft / 1.7 m
   Roll period: 13.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.11
   Seaboat quality  (Average = 1.00): 1.96

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.616 / 0.623
   Length to Beam Ratio: 9.13 : 1
   'Natural speed' for length: 26.25 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 36
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 5.64 ft / 1.72 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   16.71 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Forward deck:   30.00 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Aft deck:   36.58 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Quarter deck:   16.71 %,  29.53 ft / 9.00 m,  29.53 ft / 9.00 m
      - Average freeboard:      29.53 ft / 9.00 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 102.4 %
      - Above water (accommodation/working, high = better): 248.8 %
   Waterplane Area: 38,614 Square feet or 3,587 Square metres
   Displacement factor (Displacement / loading): 131 %
   Structure weight / hull surface area: 107 lbs/sq ft or 522 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.93
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Excellent seaboat, comfortable, can fire her guns in the heaviest weather

[The Rock Doctor]

I can see why Rome might be tempted to go with something like that.

[Jefgte]

Just 9 m above the sea. This may be a little low for a 215m and 18700t AC.

[The Rock Doctor]

I've understood the 9m to be the hanger floor, meaning the flight deck level is another 5.5 metres above that...

[TacCovert4]

I get it.  9m is a bit low on the freeboard.   But it would account for the hangar and flight deck.  In service the ship might find the flight deck to get wet in a head sea. 

[Kaiser Kirk]

So yes, for a single hanger carrier we use 9m.

Carriers are like destroyers...the darned things don't sim well. :)

So that isn't meant to be the "reality' necessarily.

The 9m and 12m heights on carriers are meant to sim the superstructure material involved in the hanger, the elevators, etc.
Using those numbers seemed to make the ships sim out similar to the historic ones.

But obviously the 3m height difference between the 9m single and 12m double isn't enough to fit another hanger level.

I suspect in "reality" we should be looking at the real hanger heights being about +3m/hanger level or about 6m.

So about 6m hangers at 12m and then 18m.
Maybe even a 2.5m deck in between the upper hanger and the flight deck. So 14.5 and 20.5m.