Imperial Roman Navy: 1915-1919 Designs

[snip]

Byzantium built in 1913, 2 ACs (Gaqus & Gadhla - now, 2nd Scout Squadron) of 15800t with 3T2x343 - belt 230 - 27kts to shoot PDNs & ACs.

=>28000t is a lot to do the same Job.

I dont disagree, but while the design requirements may be geared as an AC-killer, the expectation is LACs will need to also tangle with enemy battlecruisers as well. Sure, the Roman LACs might not stack up favorably against all hostile battlecruisers, but knowing that IC is unlikely. The worry at this point is while Rome could build a really good AC killer on much smaller tonnage (say a 8 or 12 180mm armed ship with armor to withstand heavier guns), that's a ship that is so specialized so as to be almost worthless outside of the contrived consumption that birthed the concept. Being larger to also tangle with hostile ships in the same size band means the ship has more potential uses in a general scenario. Given that it also means it can overkill its primary prey to such an extent that crippling  damage in return is highly improbable, its a worthy tradeoff in my book.

[snip]

Food for thought. What I would consider a starting point for a more "traditional" Armored Cruiser. 12x180L50 arranged A(B)[SS]Q[ss] ala the G3s.

AC-17A, Imperial Roman Armored Cruiser laid down 1917

Displacement:
   13,500 t light; 14,072 t standard; 16,233 t normal; 17,962 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (666.01 ft / 656.17 ft) x 70.54 ft x (23.79 / 25.72 ft)
   (203.00 m / 200.00 m) x 21.50 m  x (7.25 / 7.84 m)

Armament:
      12 - 7.09" / 180 mm 50.0 cal guns - 187.39lbs / 85.00kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1915 Model
     2 x Quad mounts on centreline, forward deck forward
      1 raised mount - superfiring
     1 x Quad mount on centreline, forward deck aft
      8 - 5.51" / 140 mm 55.0 cal guns - 90.37lbs / 40.99kg shells, 150 per gun
     Breech loading guns in deck and hoist mounts, 1909 Model
     4 x Twin mounts on sides, aft evenly spread
      2 raised mounts
      Weight of broadside 2,972 lbs / 1,348 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   5.91" / 150 mm   426.51 ft / 130.00 m   13.12 ft / 4.00 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.91" / 150 mm   3.94" / 100 mm      5.91" / 150 mm
   2nd:   0.59" / 15 mm   0.20" / 5 mm      1.97" / 50 mm

   - Armoured deck - single deck:
   For and Aft decks: 1.38" / 35 mm
   Forecastle: 0.98" / 25 mm  Quarter deck: 0.98" / 25 mm

   - Conning towers: Forward 7.09" / 180 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 111,059 shp / 82,850 Kw = 32.00 kts
   Range 12,000nm at 14.00 kts
   Bunker at max displacement = 3,890 tons

Complement:
   718 - 934

Cost:
   £2.477 million / $9.908 million

Distribution of weights at normal displacement:
   Armament: 756 tons, 4.7 %
      - Guns: 756 tons, 4.7 %
   Armour: 2,772 tons, 17.1 %
      - Belts: 1,367 tons, 8.4 %
      - Armament: 546 tons, 3.4 %
      - Armour Deck: 762 tons, 4.7 %
      - Conning Tower: 98 tons, 0.6 %
   Machinery: 4,071 tons, 25.1 %
   Hull, fittings & equipment: 5,680 tons, 35.0 %
   Fuel, ammunition & stores: 2,733 tons, 16.8 %
   Miscellaneous weights: 220 tons, 1.4 %
      - On freeboard deck: 200 tons
      - Above deck: 20 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     19,331 lbs / 8,769 Kg = 108.6 x 7.1 " / 180 mm shells or 1.9 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 4.1 ft / 1.3 m
   Roll period: 14.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 55 %
         - Recoil effect (Restricted arc if above 1.00): 0.44
   Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.516 / 0.528
   Length to Beam Ratio: 9.30 : 1
   'Natural speed' for length: 25.62 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 48
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 3.25 ft / 0.99 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  24.61 ft / 7.50 m,  21.33 ft / 6.50 m
      - Forward deck:   35.00 %,  21.33 ft / 6.50 m,  21.33 ft / 6.50 m
      - Aft deck:   30.00 %,  21.33 ft / 6.50 m,  21.33 ft / 6.50 m
      - Quarter deck:   15.00 %,  21.33 ft / 6.50 m,  21.33 ft / 6.50 m
      - Average freeboard:      21.59 ft / 6.58 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 99.8 %
      - Above water (accommodation/working, high = better): 177.1 %
   Waterplane Area: 31,296 Square feet or 2,908 Square metres
   Displacement factor (Displacement / loading): 114 %
   Structure weight / hull surface area: 123 lbs/sq ft or 602 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.37
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

Im not super unhappy with it, but I don't think it has enough prey as it stands with what is known for sure to justify building 2 of these in place of one of the LAC designs.

[TacCovert4]

I would agree with you.  And within enough time as to be useful, you'd be finding out about the Caribbean class.  The LAC can kill them, if not always catch them.  The above Armored Cruiser would be wholly outclassed in every way except sheer rate of fire by a 32-ish knot light battlecruiser with 280mm guns and armor to reliably withstand 200mm shellfire at most reasonable combat ranges.

[Jefgte]

AC-17A, Imperial Roman Armored Cruiser laid down 1917

Displacement:
   13,500 t light; 14,072 t standard; 16,233 t normal; 17,962 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (666.01 ft / 656.17 ft) x 70.54 ft x (23.79 / 25.72 ft)
   (203.00 m / 200.00 m) x 21.50 m  x (7.25 / 7.84 m)

Armament:
      12 - 7.09" / 180 mm 50.0 cal guns - 187.39lbs / 85.00kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1915 Model
     2 x Quad mounts on centreline, forward deck forward
      1 raised mount - superfiring
     1 x Quad mount on centreline, forward deck aft

180mm is perhaps light
Test (SS) a Panzerschiff config
13500t & 6 x 10" or 12"
---------------------

I would agree with you.  And within enough time as to be useful, you'd be finding out about the Caribbean class.  The LAC can kill them, if not always catch them.  The above Armored Cruiser would be wholly outclassed in every way except sheer rate of fire by a 32-ish knot light battlecruiser with 280mm guns and armor to reliably withstand 200mm shellfire at most reasonable combat ranges.

Built a fasterGaqus class
"If you catch me, I sink you"

[snip]

180mm is perhaps light
Test (SS) a Panzerschiff config
13500t & 6 x 10" or 12"

If I had a gun in that range, I would. Until the 235 is ready in 1918, my choices are a 180 or a 340 (the 210 I have being considered an obsolete weapon). And by 1918, I'd hold any new design until I can throw Geared Drives in beginning in 1919. That ends up making something like this fall out of the Fisherite tree.

[snip]

Slight revision to the GPC-17C design. Deck thickened to 30mm to keep out splinters from 180mm or smaller guns & thickened to 30mm over the quarterdeck, other armor thinned to compensate.

GPC-17C, Imperial Roman Republic Cruiser laid down 1917

Displacement:
   8,000 t light; 8,287 t standard; 9,332 t normal; 10,168 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (554.46 ft / 541.34 ft) x 57.41 ft x (19.69 / 21.05 ft)
   (169.00 m / 165.00 m) x 17.50 m  x (6.00 / 6.42 m)

Armament:
      6 - 7.09" / 180 mm 50.0 cal guns - 187.39lbs / 85.00kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1915 Model
     3 x 2-gun mounts on centreline ends, majority forward
      1 raised mount - superfiring
      2 - 3.94" / 100 mm 45.0 cal guns - 30.78lbs / 13.96kg shells, 175 per gun
     Anti-air guns in deck mounts, 1917 Model
     2 x Single mounts on sides, aft deck centre
      2 raised mounts
      6 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 10,000 per gun
     Machine guns in deck mounts, 1911 Model
     6 x Single mounts on sides, evenly spread
      6 raised mounts
      Weight of broadside 1,186 lbs / 538 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   3.15" / 80 mm   396.69 ft / 120.91 m   16.40 ft / 5.00 m
   Ends:   Unarmoured
     Main Belt covers 113 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.36" / 60 mm   1.18" / 30 mm      2.36" / 60 mm
   2nd:   0.20" / 5 mm         -               -
   3rd:   0.20" / 5 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 1.18" / 30 mm
   Forecastle: 0.00" / 0 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 3.94" / 100 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 78,000 shp / 58,188 Kw = 31.23 kts
   Range 8,050nm at 14.00 kts
   Bunker at max displacement = 1,881 tons

Complement:
   474 - 617

Cost:
   £1.457 million / $5.829 million

Distribution of weights at normal displacement:
   Armament: 366 tons, 3.9 %
      - Guns: 366 tons, 3.9 %
   Armour: 1,469 tons, 15.7 %
      - Belts: 831 tons, 8.9 %
      - Armament: 161 tons, 1.7 %
      - Armour Deck: 439 tons, 4.7 %
      - Conning Tower: 38 tons, 0.4 %
   Machinery: 2,859 tons, 30.6 %
   Hull, fittings & equipment: 3,101 tons, 33.2 %
   Fuel, ammunition & stores: 1,332 tons, 14.3 %
   Miscellaneous weights: 205 tons, 2.2 %
      - Hull below water: 70 tons
      - Hull above water: 30 tons
      - On freeboard deck: 85 tons
      - Above deck: 20 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     9,186 lbs / 4,167 Kg = 51.6 x 7.1 " / 180 mm shells or 1.2 torpedoes
   Stability (Unstable if below 1.00): 1.26
   Metacentric height 3.3 ft / 1.0 m
   Roll period: 13.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.31
   Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.534 / 0.544
   Length to Beam Ratio: 9.43 : 1
   'Natural speed' for length: 23.27 kts
   Power going to wave formation at top speed: 59 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 3.87 ft / 1.18 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   16.72 %,  25.43 ft / 7.75 m,  25.43 ft / 7.75 m
      - Forward deck:   20.00 %,  25.43 ft / 7.75 m,  25.43 ft / 7.75 m
      - Aft deck:   53.28 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Quarter deck:   10.00 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Average freeboard:      19.72 ft / 6.01 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 112.7 %
      - Above water (accommodation/working, high = better): 162.0 %
   Waterplane Area: 21,366 Square feet or 1,985 Square metres
   Displacement factor (Displacement / loading): 109 %
   Structure weight / hull surface area: 95 lbs/sq ft or 466 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.52
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room

[snip]

Two designs that need polish before I can stop slacking and knock off my 17H1 report. The first is a new Large Armored Cruiser. Previously I'd been debating between a strait update of Jeanne d'Arc and a streached version for another 340mm double-twin. Since I need to have something with a A(B)-Q layout, my plan was the streached version. Rather than diddle around with a less functional ship on that armement level than something I had planned on building at one point, here is an updated Tullius Leofric. Will make a nice capstone to the separation of Battleships and Large Armored cruisers before the full fusion in the early 20s. Needs some slight detail revisions for things like weapon year when I'm not on my laptop.

Tullius Leofric, Imperial Roman Republic Battlecruiser laid down 1917

Displacement:
   41,100 t light; 43,035 t standard; 45,882 t normal; 48,160 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (803.79 ft / 787.40 ft) x 108.27 ft x (29.53 / 30.76 ft)
   (245.00 m / 240.00 m) x 33.00 m  x (9.00 / 9.38 m)

Armament:
      12 - 13.39" / 340 mm 45.0 cal guns - 1,209.46lbs / 548.60kg shells, 100 per gun
     Breech loading guns in turret on barbette mounts, 1917 Model
     2 x Quad mounts on centreline, forward deck forward
      1 raised mount - superfiring
     1 x Quad mount on centreline, forward deck aft
      20 - 5.51" / 140 mm 55.0 cal guns - 90.37lbs / 40.99kg shells, 200 per gun
     Quick firing guns in casemate mounts, 1917 Model
     12 x Single mounts on sides, forward evenly spread
     8 x Single mounts on sides, aft evenly spread
      2 - 3.94" / 100 mm 45.0 cal guns - 30.77lbs / 13.96kg shells, 200 per gun
     Anti-air guns in deck and hoist mounts, 1917 Model
     2 x Single mounts on sides, aft deck centre
      2 raised mounts
      4 - 1.77" / 45.0 mm 50.0 cal guns - 2.94lbs / 1.34kg shells, 350 per gun
     Anti-air guns in deck mounts, 1917 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      10 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 15,000 per gun
     Machine guns in deck mounts, 1917 Model
     10 x Single mounts on sides, evenly spread
      Weight of broadside 16,394 lbs / 7,436 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.4" / 340 mm   472.11 ft / 143.90 m   18.04 ft / 5.50 m
   Ends:   1.97" / 50 mm   315.26 ft / 96.09 m   13.12 ft / 4.00 m
     Main Belt covers 92 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      2.36" / 60 mm   472.11 ft / 143.90 m   31.17 ft / 9.50 m
   Beam between torpedo bulkheads 85.30 ft / 26.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   16.5" / 420 mm   7.09" / 180 mm      13.4" / 340 mm
   2nd:   3.94" / 100 mm   1.97" / 50 mm      3.94" / 100 mm
   3rd:   0.20" / 5 mm         -         0.98" / 25 mm
   4th:   0.20" / 5 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 3.35" / 85 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.38" / 35 mm

   - Conning towers: Forward 13.39" / 340 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 148,000 shp / 110,408 Kw = 29.13 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 5,125 tons

Complement:
   1,566 - 2,037

Cost:
   £6.661 million / $26.644 million

Distribution of weights at normal displacement:
   Armament: 2,900 tons, 6.3 %
      - Guns: 2,900 tons, 6.3 %
   Armour: 13,737 tons, 29.9 %
      - Belts: 5,296 tons, 11.5 %
      - Torpedo bulkhead: 1,286 tons, 2.8 %
      - Armament: 3,296 tons, 7.2 %
      - Armour Deck: 3,490 tons, 7.6 %
      - Conning Tower: 370 tons, 0.8 %
   Machinery: 5,425 tons, 11.8 %
   Hull, fittings & equipment: 16,603 tons, 36.2 %
   Fuel, ammunition & stores: 4,782 tons, 10.4 %
   Miscellaneous weights: 2,435 tons, 5.3 %
      - Hull below water: 1,620 tons
      - Hull above water: 150 tons
      - On freeboard deck: 615 tons
      - Above deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     75,310 lbs / 34,160 Kg = 62.8 x 13.4 " / 340 mm shells or 10.9 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 8.0 ft / 2.4 m
   Roll period: 16.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.64
   Seaboat quality  (Average = 1.00): 1.31

Hull form characteristics:
   Hull has low quarterdeck ,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.638 / 0.643
   Length to Beam Ratio: 7.27 : 1
   'Natural speed' for length: 28.06 kts
   Power going to wave formation at top speed: 52 %
   Trim (Max stability = 0, Max steadiness = 100): 53
   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:   21.00 %,  29.53 ft / 9.00 m,  28.71 ft / 8.75 m
      - Forward deck:   35.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Aft deck:   24.96 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Quarter deck:   19.04 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      27.06 ft / 8.25 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 91.7 %
      - Above water (accommodation/working, high = better): 225.5 %
   Waterplane Area: 64,590 Square feet or 6,001 Square metres
   Displacement factor (Displacement / loading): 112 %
   Structure weight / hull surface area: 198 lbs/sq ft or 966 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.43
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[snip]

1919 sees Geared Drives show up, so some existing designs are going to get a mid-cycle refresh to accommodate them. First up is the GFD-19 design, essentially an updated Rainier Marion. The additional Misc weight allocated above what the Rainier Marion's have is intended for ASW gear. It also replaces the long 140L55 for a 140L40, specifically developed for use on lighter ships.

GFD-19, Imperial Roman Destroyer laid down 1919

Displacement:
   1,500 t light; 1,561 t standard; 1,777 t normal; 1,950 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (347.76 ft / 344.49 ft) x 32.81 ft x (11.48 / 12.30 ft)
   (106.00 m / 105.00 m) x 10.00 m  x (3.50 / 3.75 m)

Armament:
      4 - 5.51" / 140 mm 40.0 cal guns - 85.98lbs / 39.00kg shells, 130 per gun
     Quick firing guns in deck mounts, 1917 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      4 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 10,000 per gun
     Machine guns in deck mounts, 1911 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 344 lbs / 156 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.39" / 10 mm   0.20" / 5 mm            -
   2nd:   0.20" / 5 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 32,000 shp / 23,872 Kw = 30.99 kts
   Range 4,780nm at 14.00 kts
   Bunker at max displacement = 389 tons

Complement:
   136 - 177

Cost:
   £0.422 million / $1.690 million

Distribution of weights at normal displacement:
   Armament: 49 tons, 2.8 %
      - Guns: 49 tons, 2.8 %
   Armour: 9 tons, 0.5 %
      - Armament: 9 tons, 0.5 %
   Machinery: 910 tons, 51.2 %
   Hull, fittings & equipment: 437 tons, 24.6 %
   Fuel, ammunition & stores: 277 tons, 15.6 %
   Miscellaneous weights: 95 tons, 5.3 %
      - Hull below water: 20 tons
      - On freeboard deck: 75 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     512 lbs / 232 Kg = 6.1 x 5.5 " / 140 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.26
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 73 %
         - Recoil effect (Restricted arc if above 1.00): 0.44
   Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.479 / 0.491
   Length to Beam Ratio: 10.50 : 1
   'Natural speed' for length: 18.56 kts
   Power going to wave formation at top speed: 66 %
   Trim (Max stability = 0, Max steadiness = 100): 63
   Bow angle (Positive = bow angles forward): 12.50 degrees
   Stern overhang: -4.92 ft / -1.50 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
      - Forward deck:   30.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
      - Aft deck:   35.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
      - Quarter deck:   15.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
      - Average freeboard:      14.76 ft / 4.50 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 174.5 %
      - Above water (accommodation/working, high = better): 152.8 %
   Waterplane Area: 7,391 Square feet or 687 Square metres
   Displacement factor (Displacement / loading): 71 %
   Structure weight / hull surface area: 32 lbs/sq ft or 154 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.84
      - Overall: 0.57
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[Jefgte]

I have also tested the 140mm (from HMS Hood) on destroyers. For the moment, I prefer to keep the 120mm (in twin mount if necessary).
The 120mm shell is lighter to handle on a small moving ship and the rate of fire is higher.

[Desertfox]

It also replaces the long 140L55 for a 140L40, specifically developed for use on lighter ships.

Interesting how Rome is going from a big HV gun to a LV, while Japan going with a smaller 127mm gun is going the other way from LV to HV.

[snip]

And looking at another 1919 design, a more "conventional" armored cruiser. Something that can handily outfight a protected cruiser while having the turn of speed to run from anything which can really hurt her in return. Of course there are some Aztec battlecruisers which make that something I probly dont want to test to much.

Timere, Imperial Roman Armored Cruiser laid down 1919

Displacement:
   21,100 t light; 21,917 t standard; 24,558 t normal; 26,671 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (803.80 ft / 787.40 ft) x 82.02 ft x (26.25 / 27.95 ft)
   (245.00 m / 240.00 m) x 25.00 m  x (8.00 / 8.52 m)

Armament:
      8 - 9.25" / 235 mm 45.0 cal guns - 396.83lbs / 180.00kg shells, 125 per gun
     Breech loading guns in turret on barbette mounts, 1919 Model
     2 x Quad mounts on centreline ends, evenly spread
      12 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 175 per gun
     Quick firing guns in casemate mounts, 1909 Model
     12 x Single mounts on sides, aft evenly spread
      2 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 110 per gun
     Anti-air guns in deck mounts, 1915 Model
     2 x Single mounts on sides, aft deck centre
      2 raised mounts
      10 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 15,000 per gun
     Machine guns in deck mounts, 1910 Model
     6 x Single mounts on sides, aft evenly spread
      6 raised mounts
     2 x Twin mounts on sides, forward deck aft
      2 double raised mounts
      Weight of broadside 4,268 lbs / 1,936 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   6.30" / 160 mm   532.74 ft / 162.38 m   18.04 ft / 5.50 m
   Ends:   1.97" / 50 mm   254.63 ft / 77.61 m   13.12 ft / 4.00 m
     Main Belt covers 104 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      0.79" / 20 mm   532.74 ft / 162.38 m   29.53 ft / 9.00 m
   Beam between torpedo bulkheads 65.62 ft / 20.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   9.25" / 235 mm   3.94" / 100 mm      7.48" / 190 mm
   2nd:   3.94" / 100 mm   1.18" / 30 mm      3.94" / 100 mm
   3rd:   0.20" / 5 mm         -               -
   4th:   0.20" / 5 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 2.95" / 75 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.38" / 35 mm

   - Conning towers: Forward 9.84" / 250 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 4 shafts, 140,000 shp / 104,440 Kw = 32.42 kts
   Range 12,000nm at 14.00 kts
   Bunker at max displacement = 4,755 tons

Complement:
   980 - 1,275

Cost:
   £3.926 million / $15.706 million

Distribution of weights at normal displacement:
   Armament: 951 tons, 3.9 %
      - Guns: 951 tons, 3.9 %
   Armour: 6,238 tons, 25.4 %
      - Belts: 2,722 tons, 11.1 %
      - Torpedo bulkhead: 458 tons, 1.9 %
      - Armament: 707 tons, 2.9 %
      - Armour Deck: 2,171 tons, 8.8 %
      - Conning Tower: 179 tons, 0.7 %
   Machinery: 4,972 tons, 20.2 %
   Hull, fittings & equipment: 8,189 tons, 33.3 %
   Fuel, ammunition & stores: 3,458 tons, 14.1 %
   Miscellaneous weights: 750 tons, 3.1 %
      - Hull below water: 200 tons
      - Hull above water: 200 tons
      - On freeboard deck: 300 tons
      - Above deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     34,705 lbs / 15,742 Kg = 87.6 x 9.3 " / 235 mm shells or 4.4 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 5.5 ft / 1.7 m
   Roll period: 14.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.30
   Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.507 / 0.517
   Length to Beam Ratio: 9.60 : 1
   'Natural speed' for length: 28.06 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 54
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 5.05 ft / 1.54 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   17.34 %,  31.17 ft / 9.50 m,  27.89 ft / 8.50 m
      - Forward deck:   20.00 %,  27.89 ft / 8.50 m,  27.89 ft / 8.50 m
      - Aft deck:   47.66 %,  18.86 ft / 5.75 m,  18.86 ft / 5.75 m
      - Quarter deck:   15.00 %,  18.86 ft / 5.75 m,  18.86 ft / 5.75 m
      - Average freeboard:      22.46 ft / 6.85 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 102.4 %
      - Above water (accommodation/working, high = better): 181.2 %
   Waterplane Area: 43,309 Square feet or 4,024 Square metres
   Displacement factor (Displacement / loading): 120 %
   Structure weight / hull surface area: 133 lbs/sq ft or 650 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.04
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[snip]

Kicking around since the loss of her three sisters during the Caicos Affair, the IRS Vesontio has been in an interesting position. Lacking any other cruisers in the IRN lineup with which she meshes well, to fast to work with old VTE cruiser, to slow for more modern turbine ships, various proposals have been tossed around for her use. Finally, the dropped quarterdeck has won over most parties into using the Vesontio as the test-bed for the new concept of a Seaplane Tender. Intending to operate newer, longer ranged multi-engine seaplanes coming into service, the current proposal is for a conversion which would operate 3 of these planes.

IRS Vesontio, Imperial Roman Republic Seaplane Carrier Conversion laid down 1904

Displacement:
   5,048 t light; 5,209 t standard; 5,847 t normal; 6,357 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (364.17 ft / 360.89 ft) x 54.13 ft x (20.51 / 21.86 ft)
   (111.00 m / 110.00 m) x 16.50 m  x (6.25 / 6.66 m)

Armament:
      4 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 200 per gun
     Quick firing guns in deck and hoist mounts, 1909 Model
     2 x Twin mounts on centreline, forward deck forward
      2 raised mounts
      1 - 3.94" / 100 mm 45.0 cal gun - 30.86lbs / 14.00kg shells, 350 per gun
     Quick firing gun in deck and hoist mount, 1915 Model
     1 x Single mount on centreline, forward deck aft
      1 raised mount
      4 - 0.26" / 6.5 mm 110.0 cal guns - 0.01lbs / 0.00kg shells, 15,000 per gun
     Machine guns in deck mounts, 1911 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 375 lbs / 170 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.57" / 40 mm   0.39" / 10 mm      1.57" / 40 mm
   2nd:   0.59" / 15 mm         -         1.57" / 40 mm
   3rd:   0.20" / 5 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 1.18" / 30 mm
   Forecastle: 1.18" / 30 mm  Quarter deck: 1.18" / 30 mm

   - Conning towers: Forward 2.95" / 75 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 26,505 shp / 19,773 Kw = 24.40 kts
   Range 3,339nm at 14.00 kts
   Bunker at max displacement = 1,148 tons

Complement:
   333 - 434

Cost:
   £0.559 million / $2.236 million

Distribution of weights at normal displacement:
   Armament: 104 tons, 1.8 %
      - Guns: 104 tons, 1.8 %
   Armour: 324 tons, 5.5 %
      - Armament: 14 tons, 0.2 %
      - Armour Deck: 290 tons, 5.0 %
      - Conning Tower: 21 tons, 0.4 %
   Machinery: 2,410 tons, 41.2 %
   Hull, fittings & equipment: 1,595 tons, 27.3 %
   Fuel, ammunition & stores: 799 tons, 13.7 %
   Miscellaneous weights: 615 tons, 10.5 %
      - Hull below water: 200 tons
      - Hull above water: 200 tons
      - On freeboard deck: 200 tons
      - Above deck: 15 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,094 lbs / 1,404 Kg = 37.0 x 5.5 " / 140 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.34
   Metacentric height 3.4 ft / 1.0 m
   Roll period: 12.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.16
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.511 / 0.521
   Length to Beam Ratio: 6.67 : 1
   'Natural speed' for length: 19.00 kts
   Power going to wave formation at top speed: 61 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.52 ft / 0.16 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Forward deck:   30.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Aft deck:   35.00 %,  15.58 ft / 4.75 m,  15.58 ft / 4.75 m
      - Quarter deck:   15.00 %,  6.56 ft / 2.00 m,  6.56 ft / 2.00 m
      - Average freeboard:      14.23 ft / 4.34 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 148.0 %
      - Above water (accommodation/working, high = better): 117.2 %
   Waterplane Area: 13,147 Square feet or 1,221 Square metres
   Displacement factor (Displacement / loading): 95 %
   Structure weight / hull surface area: 80 lbs/sq ft or 391 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.13
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Preformed Actions
--Change Coal/Oil Spray -> Oil
--Changed Range to @14knt figure
--Returned bunker to max capacity (3339nm@14knts)
--Thinned Main Protected Deck to 30mm from 70mm
--Changed Armament to following
---2x2 140L55 QF A(B)
---1x1 100L45 AA (Q)
---4x1 6.5L110 MG (Sides)
--MisWeight Updated to
---615t (200/200/200/15)
--Weights Reserved for...
---Fire Control (11t)
---LR Wireless (25t)
---Backup SR Wireless (10t)
---Improved Signaling Equipment (15t Above Water)
---Reserve (4t)

Max Planes (Multi): 3 (495t) [Leaves 55t]

I'll do the cost calculations a little later, but I have a good handful of old VTE cruisers which can probly be lightly culled to fund this.

[The Rock Doctor]

The end product is useful but I'm curious to see the final cost.

I assume the 100mm is intended to be AA?

[snip]

Yes, that is supposed to be AA.

[snip]

And belated cost for the above.

Refit level Base Cost - $1
Armament
104t -> .1BP $.2
Armor
290t -> .3BP $.3
Functional MisWeight
615t -> .6BP $.6
Fuel Change
1,148t -> $.51

Total $2.6 1BP

Not to bad.