Imperial Roman Navy: 1915-1919 Designs

[Kaiser Kirk]

With how big the Large Armored Cruiser Fast Battleship designs are trending, I figured it was time to take a look at something slightly more manageable more geared to counter-raider rather than having counter-raider capabilities while still being a line of battle ship. Its a few years out as its missing basically every tech piece about it, but I wanted to fiddle with the concept.

Timere, Imperial Roman Armored Cruiser laid down 1919

Actually +4 year ships start entering that hard to evaluate realm.
An entire generation of cruisers can enter service in that time period.
but it illustrates the difficulties with this 'mid' role.
The 235mm gun is a reasonable size, able to punch holes in most protected cruisers at current battle ranges and a bit beyond.
It's fast enough to catch all but the most recent cruisers, but at 20,000 tons a bit expensive.

I would say the 20mm torpedo bulkhead is probably not fully adequate against a same-era full torpedo.

I'm a little surprised it's not all - guns forward as a hunter.
Also, if she's chasing something in bad weather, you likely don't want her taking green over the bow, so a little height there might help.

[Kaiser Kirk]

Byzantium does not change the speed of its battle line, for the battleships of 1916 and 1917, still 21kts. Scout ships, 27kts.

Parthia meant to stick to a 20/27 mix, but the Malta treaty has lead me to consider the faster Roman cruisers as well,
so instead of shrinking to to 5000t and 27knts, the Maelstrom/Ranger series has been 6000 and 29.

[snip]

Now that its back on the table, a revision to LBS-16B. Gains a little weight to provide a 15mm splinter deck.

LBS-16B, Imperial Roman Battleship laid down 1916

Displacement:
   34,500 t light; 36,579 t standard; 38,910 t normal; 40,775 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (685.71 ft / 672.57 ft) x 101.71 ft x (29.53 / 30.75 ft)
   (209.00 m / 205.00 m) x 31.00 m  x (9.00 / 9.37 m)

Armament:
      8 - 16.14" / 410 mm 45.0 cal guns - 2,120.85lbs / 962.00kg shells, 110 per gun
     Breech loading guns in turret on barbette mounts, 1915 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      20 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 175 per gun
     Quick firing guns in casemate mounts, 1909 Model
     14 x Single mounts on sides, aft evenly spread
     6 x Single mounts on sides, forward evenly spread
      6 hull mounts in casemates- Limited use in heavy seas
      16 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 350 per gun
     Quick firing guns in deck and hoist mounts, 1906 Model
     8 x Twin mounts on sides, evenly spread
      8 raised mounts
      4 - 1.77" / 45.0 mm 50.0 cal guns - 3.31lbs / 1.50kg shells, 75 per gun
     Anti-air guns in deck mounts, 1910 Model
     4 x Single mounts on side ends, evenly spread
      4 raised mounts
      10 - 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
     10 x Single mounts on sides, evenly spread
      10 raised mounts
      Weight of broadside 19,194 lbs / 8,706 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.6" / 345 mm   437.17 ft / 133.25 m   18.04 ft / 5.50 m
   Ends:   1.97" / 50 mm   235.37 ft / 71.74 m   13.12 ft / 4.00 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      3.15" / 80 mm   437.17 ft / 133.25 m   31.17 ft / 9.50 m
   Beam between torpedo bulkheads 82.02 ft / 25.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   17.3" / 440 mm   7.09" / 180 mm      11.8" / 300 mm
   2nd:   3.94" / 100 mm   1.97" / 50 mm      3.94" / 100 mm
   3rd:   0.59" / 15 mm         -         1.97" / 50 mm
   4th:   0.39" / 10 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 13.78" / 350 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 70,000 shp / 52,220 Kw = 24.23 kts
   Range 7,000nm at 14.00 kts
   Bunker at max displacement = 4,196 tons

Complement:
   1,384 - 1,800

Cost:
   £5.412 million / $21.648 million

Distribution of weights at normal displacement:
   Armament: 3,835 tons, 9.9 %
      - Guns: 3,835 tons, 9.9 %
   Armour: 13,442 tons, 34.5 %
      - Belts: 4,924 tons, 12.7 %
      - Torpedo bulkhead: 1,588 tons, 4.1 %
      - Armament: 3,616 tons, 9.3 %
      - Armour Deck: 2,973 tons, 7.6 %
      - Conning Tower: 341 tons, 0.9 %
   Machinery: 2,608 tons, 6.7 %
   Hull, fittings & equipment: 13,035 tons, 33.5 %
   Fuel, ammunition & stores: 4,410 tons, 11.3 %
   Miscellaneous weights: 1,580 tons, 4.1 %
      - Hull below water: 850 tons
      - Hull above water: 200 tons
      - On freeboard deck: 480 tons
      - Above deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     61,360 lbs / 27,833 Kg = 29.2 x 16.1 " / 410 mm shells or 10.4 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 7.6 ft / 2.3 m
   Roll period: 15.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 50 %
         - Recoil effect (Restricted arc if above 1.00): 0.70
   Seaboat quality  (Average = 1.00): 1.39

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.674 / 0.679
   Length to Beam Ratio: 6.61 : 1
   'Natural speed' for length: 25.93 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 36
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 5.45 ft / 1.66 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Forward deck:   20.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Aft deck:   45.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Quarter deck:   15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      23.29 ft / 7.10 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 81.9 %
      - Above water (accommodation/working, high = better): 165.6 %
   Waterplane Area: 53,580 Square feet or 4,978 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 201 lbs/sq ft or 982 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.51
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Good seaboat, rides out heavy weather easily

Armored deck broken up as 70mm main deck over Fore/Aft with a 15mm splinter deck. End armor is uniform 35mm deck.

[snip]

The finalized design for the GFD-16 Specification.

Rainier Marion, Imperial Roman Destroyer laid down 1916

Displacement:
   1,500 t light; 1,560 t standard; 1,802 t normal; 1,996 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 / 12.39 ft)
   (106.00 m / 105.00 m) x 10.00 m  x (3.50 / 3.78 m)

Armament:
      4 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 125 per gun
     Quick firing guns in deck mounts, 1909 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,
   Direct drive, 2 shafts, 32,000 shp / 23,872 Kw = 30.89 kts
   Range 4,780nm at 14.00 kts
   Bunker at max displacement = 436 tons

Complement:
   137 - 179

Cost:
   £0.333 million / $1.333 million

Distribution of weights at normal displacement:
   Armament: 76 tons, 4.2 %
      - Guns: 76 tons, 4.2 %
   Armour: 9 tons, 0.5 %
      - Armament: 9 tons, 0.5 %
   Machinery: 930 tons, 51.6 %
   Hull, fittings & equipment: 420 tons, 23.3 %
   Fuel, ammunition & stores: 302 tons, 16.8 %
   Miscellaneous weights: 65 tons, 3.6 %
      - On freeboard deck: 65 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     502 lbs / 228 Kg = 6.0 x 5.5 " / 140 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.28
   Metacentric height 1.5 ft / 0.4 m
   Roll period: 11.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.42
   Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.486 / 0.499
   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): 61
   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): 177.7 %
      - Above water (accommodation/working, high = better): 152.6 %
   Waterplane Area: 7,436 Square feet or 691 Square metres
   Displacement factor (Displacement / loading): 68 %
   Structure weight / hull surface area: 32 lbs/sq ft or 154 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.82
      - Overall: 0.57
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

Misc Wieght
--24t 6x530mm (1913) Torpedo Tubes (2x3 mounts centerline)
--8t 1912 FC
--25t LR Wireless
--3t Night Fighting Equpment
--5t Construction Reserve

Trial Speed: 31.5knts

Range
10knts/10220nm
14knts/4780nm
20knts/1917nm
25knts/1005nm
30.89knts/517nm

Time at Top Speed: 16.74 Hours
Fastest Speed From Brest to Havana (3943nm):15.16knts for 260.09h transit

The GFD-16 Specification called for a light warship capable of preforming a fusion of traditional destroyer and protected cruiser roles. Taking into account the experience of the destroyer forces at Ironclad Bay, the design uses the ubiquitous 140L55 and can fire two such weapons from the front of the ship. The design also mounts the new more powerful 530mm torpedoes, but moves to a all-centerline mount for the weapons given how many destroyers at Ironclad Bay were sunk before they had a chance to use the weapons mounted on the non-engaged side of the ship. The design pulls back a little from previous destroyer practice of speed taking supremacy for better range, able to preform the Rapid Fleet Transit without need to refuel. Ships of the class are to be named for the commanders of the destroyer force killed in action at Ironclad Bay. 15 ships of the type are planned for construction between 1916 and 1919.

[snip]

The finalized LBS-16 design, proposal B. Should I move forward with building these units, this will be the design.

LBS-16B, Imperial Roman Battleship laid down 1916

Displacement:
   34,500 t light; 36,579 t standard; 38,910 t normal; 40,775 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (685.71 ft / 672.57 ft) x 101.71 ft x (29.53 / 30.75 ft)
   (209.00 m / 205.00 m) x 31.00 m  x (9.00 / 9.37 m)

Armament:
      8 - 16.14" / 410 mm 45.0 cal guns - 2,120.85lbs / 962.00kg shells, 110 per gun
     Breech loading guns in turret on barbette mounts, 1915 Model
     4 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      20 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 175 per gun
     Quick firing guns in casemate mounts, 1909 Model
     16 x Single mounts on sides, aft evenly spread
     4 x Single mounts on sides, forward evenly spread
      4 hull mounts in casemates- Limited use in heavy seas
      16 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 350 per gun
     Quick firing guns in deck and hoist mounts, 1906 Model
     8 x Twin mounts on sides, evenly spread
      8 raised mounts
      4 - 1.77" / 45.0 mm 50.0 cal guns - 3.31lbs / 1.50kg shells, 75 per gun
     Anti-air guns in deck mounts, 1910 Model
     4 x Single mounts on side ends, evenly spread
      4 raised mounts
      10 - 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
     10 x Single mounts on sides, evenly spread
      10 raised mounts
      Weight of broadside 19,194 lbs / 8,706 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   13.6" / 345 mm   437.17 ft / 133.25 m   18.04 ft / 5.50 m
   Ends:   1.97" / 50 mm   235.37 ft / 71.74 m   13.12 ft / 4.00 m
     Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      3.15" / 80 mm   437.17 ft / 133.25 m   31.17 ft / 9.50 m
   Beam between torpedo bulkheads 82.02 ft / 25.00 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   17.3" / 440 mm   7.09" / 180 mm      11.8" / 300 mm
   2nd:   3.94" / 100 mm   1.97" / 50 mm      3.94" / 100 mm
   3rd:   0.59" / 15 mm         -         1.97" / 50 mm
   4th:   0.39" / 10 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 13.78" / 350 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 70,000 shp / 52,220 Kw = 24.23 kts
   Range 7,000nm at 14.00 kts
   Bunker at max displacement = 4,196 tons

Complement:
   1,384 - 1,800

Cost:
   £5.412 million / $21.648 million

Distribution of weights at normal displacement:
   Armament: 3,835 tons, 9.9 %
      - Guns: 3,835 tons, 9.9 %
   Armour: 13,442 tons, 34.5 %
      - Belts: 4,924 tons, 12.7 %
      - Torpedo bulkhead: 1,588 tons, 4.1 %
      - Armament: 3,616 tons, 9.3 %
      - Armour Deck: 2,973 tons, 7.6 %
      - Conning Tower: 341 tons, 0.9 %
   Machinery: 2,608 tons, 6.7 %
   Hull, fittings & equipment: 12,935 tons, 33.2 %
   Fuel, ammunition & stores: 4,410 tons, 11.3 %
   Miscellaneous weights: 1,680 tons, 4.3 %
      - Hull below water: 850 tons
      - Hull above water: 150 tons
      - On freeboard deck: 630 tons
      - Above deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     60,462 lbs / 27,425 Kg = 28.8 x 16.1 " / 410 mm shells or 10.3 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 7.5 ft / 2.3 m
   Roll period: 15.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.69
   Seaboat quality  (Average = 1.00): 1.37

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.674 / 0.679
   Length to Beam Ratio: 6.61 : 1
   'Natural speed' for length: 25.93 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 37
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 5.45 ft / 1.66 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Forward deck:   15.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Aft deck:   50.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Quarter deck:   15.00 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      22.84 ft / 6.96 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 81.8 %
      - Above water (accommodation/working, high = better): 160.5 %
   Waterplane Area: 53,580 Square feet or 4,978 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 201 lbs/sq ft or 979 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.47
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Good seaboat, rides out heavy weather easily

Misc Weight Distribution
-Below Water (850t)
--652t Electric Drives
--100t Additional Pumps
--40t Additional Damage Control Equipment
--8t Construction Reserve
-Above Water (200t)
--40t Improved Officer Accommodations
--40t Improved Crew Accommodations
--70t Additional Damage Control Equipment
--20t Enhanced Ventilation and Crew Comfort
--20t Short-Range Wireless (x2)
--10t Construction Reserve
-On Deck (630t)
--384t 1912 Fire Control
--35t Flag Facilities
--40t Admiralty Accommodations
--25t Long Range Wireless
--20t Enhanced Ventilation and Crew Comfort
--40t Night Fighting Equipment
--50t Additional Damage Control Equipment
--25t Huelsmeyre Equipment
--11t Construction Reserve
-Above Deck (50t)
--20t Additional Optical Spotting Equipment
--15t Night Fighting Equipment
--15t Improved Signaling Equipment


Main Battery arranged A(B)[SS](X)Y with B superfiring A and X superfiring Y.

Armored deck broken up as 70mm main deck over Fore/Aft with a 15mm splinter deck. End armor is uniform 35mm deck.

Bunker 4196

Cruise Speeds/SpringSharp Range/True Range
10knts/14665nm
14knts/7000nm
20knts/2888nm
24knts/1742nm

Time at Top Speed:  72.58 Hours
Fastest Speed From Brest to Havana (3943nm): 17.743knts for 222.23h transit

Intended as the second pair of 24knt battleships to form a four-unit group with the Audax class, the LBS-16 requirements called for use of the new 410L45 gun. While variants with up to 16x340mm guns were explored, the additional punch of the individual 410mm shells was viewed as more valuable in the aftermath of Ironclad Bay. Originally planned as a 1915 design, war repairs necessitated a delay which allowed for a more extensive modification to the design.

[snip]

With two LBS-16 units slated for a 1916 laydown, there is still a need for an additional Large Armored cruiser but construction of such a unit would not be able to begin until the completion of the Jeanne d'Arc in 1917. The Jeanne d'Arc is considered an top-line unit for her class, and as such the LAC-17 requirement calls for a vastly similar ship. There are currently two designs proposed, the A design is an updated version of Jeanne d'Arc, while the B design is elongated to accommodate a third double-twin turret for the main battery. The designs are otherwise largely identical, with some slight differences in armor deck layout as the main difference; the A design sports a uniform 70mm deck while the B design keeps JdA's 60mm deck and adds a 15mm splinter deck beneath it.

LAC-17A, Imperial Roman Large Armored Cruiser laid down 1917

Displacement:
   28,000 t light; 29,498 t standard; 31,712 t normal; 33,483 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (702.12 ft / 685.70 ft) x 101.71 ft x (28.54 / 29.81 ft)
   (214.00 m / 209.00 m) x 31.00 m  x (8.70 / 9.09 m)

Armament:
      8 - 13.39" / 340 mm 45.0 cal guns - 1,212.54lbs / 550.00kg shells, 110 per gun
     Breech loading guns in turret on barbette mounts, 1909 Model
     2 x Quad mounts on centreline ends, evenly spread
      20 - 5.51" / 140 mm 55.0 cal guns - 85.98lbs / 39.00kg shells, 175 per gun
     Quick firing guns in casemate mounts, 1909 Model
     16 x Single mounts on sides, aft evenly spread
     4 x Single mounts on sides, forward evenly spread
      4 hull mounts in casemates- Limited use in heavy seas
      16 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 350 per gun
     Quick firing guns in deck and hoist mounts, 1906 Model
     8 x Twin mounts on sides, aft evenly spread
      8 raised mounts
      4 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 110 per gun
     Anti-air guns in deck mounts, 1915 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, 10,000 per gun
     Machine guns in deck mounts, 1911 Model
     10 x Single mounts on sides, evenly spread
      10 raised mounts
      Weight of broadside 12,037 lbs / 5,460 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   9.45" / 240 mm   430.91 ft / 131.34 m   18.04 ft / 5.50 m
   Ends:   1.97" / 50 mm   254.79 ft / 77.66 m   9.84 ft / 3.00 m
     Main Belt covers 97 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.97" / 50 mm   430.91 ft / 131.34 m   30.35 ft / 9.25 m
   Beam between torpedo bulkheads 86.94 ft / 26.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   13.4" / 340 mm   7.09" / 180 mm      11.0" / 280 mm
   2nd:   3.94" / 100 mm   0.98" / 25 mm      3.94" / 100 mm
   3rd:   0.59" / 15 mm   0.20" / 5 mm      0.79" / 20 mm
   4th:   0.20" / 5 mm         -               -
   5th:   0.20" / 5 mm         -               -

   - Armoured deck - single deck:
   For and Aft decks: 2.76" / 70 mm
   Forecastle: 1.38" / 35 mm  Quarter deck: 1.38" / 35 mm

   - Conning towers: Forward 9.45" / 240 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 124,000 shp / 92,504 Kw = 29.31 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 3,985 tons

Complement:
   1,187 - 1,544

Cost:
   £4.868 million / $19.473 million

Distribution of weights at normal displacement:
   Armament: 2,179 tons, 6.9 %
      - Guns: 2,179 tons, 6.9 %
   Armour: 8,459 tons, 26.7 %
      - Belts: 3,379 tons, 10.7 %
      - Torpedo bulkhead: 952 tons, 3.0 %
      - Armament: 1,662 tons, 5.2 %
      - Armour Deck: 2,261 tons, 7.1 %
      - Conning Tower: 204 tons, 0.6 %
   Machinery: 4,545 tons, 14.3 %
   Hull, fittings & equipment: 10,972 tons, 34.6 %
   Fuel, ammunition & stores: 3,712 tons, 11.7 %
   Miscellaneous weights: 1,845 tons, 5.8 %
      - Hull below water: 1,255 tons
      - Hull above water: 150 tons
      - On freeboard deck: 400 tons
      - Above deck: 40 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     42,481 lbs / 19,269 Kg = 35.4 x 13.4 " / 340 mm shells or 6.3 torpedoes
   Stability (Unstable if below 1.00): 1.28
   Metacentric height 8.0 ft / 2.4 m
   Roll period: 15.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.42
   Seaboat quality  (Average = 1.00): 1.14

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.558 / 0.564
   Length to Beam Ratio: 6.74 : 1
   'Natural speed' for length: 26.19 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 61
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 5.97 ft / 1.82 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Forward deck:   15.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Aft deck:   47.84 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Quarter deck:   17.16 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      22.84 ft / 6.96 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 96.6 %
      - Above water (accommodation/working, high = better): 171.8 %
   Waterplane Area: 49,016 Square feet or 4,554 Square metres
   Displacement factor (Displacement / loading): 107 %
   Structure weight / hull surface area: 175 lbs/sq ft or 853 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.53
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

LAC-17B, Imperial Roman Large Armored Cruiser laid down 1917

Displacement:
   33,500 t light; 35,419 t standard; 37,927 t normal; 39,934 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (738.20 ft / 721.78 ft) x 101.71 ft x (28.54 / 29.81 ft)
   (225.00 m / 220.00 m) x 31.00 m  x (8.70 / 9.09 m)

Armament:
      12 - 13.39" / 340 mm 45.0 cal guns - 1,212.54lbs / 550.00kg shells, 110 per gun
     Breech loading guns in turret on barbette mounts, 1909 Model
     3 x Quad mounts on centreline ends, majority forward
      1 raised mount - superfiring
      20 - 5.51" / 140 mm 45.0 cal guns - 85.98lbs / 39.00kg shells, 175 per gun
     Quick firing guns in casemate mounts, 1909 Model
     14 x Single mounts on sides, aft evenly spread
     6 x Single mounts on side ends, majority forward
      6 hull mounts in casemates- Limited use in heavy seas
      16 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 350 per gun
     Quick firing guns in deck and hoist mounts, 1906 Model
     8 x Twin mounts on sides, evenly spread
      8 raised mounts
      4 - 3.94" / 100 mm 45.0 cal guns - 30.86lbs / 14.00kg shells, 110 per gun
     Anti-air guns in deck mounts, 1915 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      10 - 0.26" / 6.5 mm 45.0 cal guns - 0.01lbs / 0.00kg shells, 10,000 per gun
     Machine guns in deck mounts, 1911 Model
     10 x Single mounts on sides, evenly spread
      10 raised mounts
      Weight of broadside 16,887 lbs / 7,660 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   9.45" / 240 mm   453.28 ft / 138.16 m   18.04 ft / 5.50 m
   Ends:   1.97" / 50 mm   268.47 ft / 81.83 m   9.84 ft / 3.00 m
     Main Belt covers 97 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.97" / 50 mm   453.28 ft / 138.16 m   30.35 ft / 9.25 m
   Beam between torpedo bulkheads 86.94 ft / 26.50 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   13.4" / 340 mm   7.09" / 180 mm      11.0" / 280 mm
   2nd:   3.94" / 100 mm   0.98" / 25 mm      3.94" / 100 mm
   3rd:   0.59" / 15 mm   0.20" / 5 mm      0.79" / 20 mm
   4th:   0.20" / 5 mm         -               -

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

   - Conning towers: Forward 9.45" / 240 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Electric motors, 4 shafts, 134,000 shp / 99,964 Kw = 29.02 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 4,515 tons

Complement:
   1,358 - 1,766

Cost:
   £6.087 million / $24.348 million

Distribution of weights at normal displacement:
   Armament: 2,922 tons, 7.7 %
      - Guns: 2,922 tons, 7.7 %
   Armour: 10,139 tons, 26.7 %
      - Belts: 3,555 tons, 9.4 %
      - Torpedo bulkhead: 1,002 tons, 2.6 %
      - Armament: 2,637 tons, 7.0 %
      - Armour Deck: 2,715 tons, 7.2 %
      - Conning Tower: 230 tons, 0.6 %
   Machinery: 4,912 tons, 13.0 %
   Hull, fittings & equipment: 13,512 tons, 35.6 %
   Fuel, ammunition & stores: 4,427 tons, 11.7 %
   Miscellaneous weights: 2,015 tons, 5.3 %
      - Hull below water: 1,300 tons
      - Hull above water: 150 tons
      - On freeboard deck: 525 tons
      - Above deck: 40 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     48,703 lbs / 22,091 Kg = 40.6 x 13.4 " / 340 mm shells or 6.8 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 7.2 ft / 2.2 m
   Roll period: 16.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 60 %
         - Recoil effect (Restricted arc if above 1.00): 0.64
   Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a round stern
   Block coefficient (normal/deep): 0.634 / 0.639
   Length to Beam Ratio: 7.10 : 1
   'Natural speed' for length: 26.87 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 56
   Bow angle (Positive = bow angles forward): 20.00 degrees
   Stern overhang: 5.97 ft / 1.82 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Forward deck:   20.00 %,  28.71 ft / 8.75 m,  28.71 ft / 8.75 m
      - Aft deck:   42.80 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Quarter deck:   17.20 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Average freeboard:      23.29 ft / 7.10 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 96.6 %
      - Above water (accommodation/working, high = better): 175.3 %
   Waterplane Area: 55,390 Square feet or 5,146 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 193 lbs/sq ft or 940 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.34
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room

[Jefgte]

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   9.45" / 240 mm   430.91 ft / 131.34 m   18.04 ft / 5.50 m
   Ends:   1.97" / 50 mm   254.79 ft / 77.66 m   9.84 ft / 3.00 m
     Main Belt covers 97 % of normal length

28000t & 240mm for the belt...

If you could increase the belt to 305 or more, that's better.

[snip]

Only way to do that is making the belt vertically shorter or the ship fatter. For its intended anti-Armored Cruiser role, its adequate and if I push for 305, the gap between this design and something large like the later Tullius Leofric proposals is small enough to just push for the later.

[TacCovert4]

Only way to do that is making the belt vertically shorter or the ship fatter. For its intended anti-Armored Cruiser role, its adequate and if I push for 305, the gap between this design and something large like the later Tullius Leofric proposals is small enough to just push for the later.

Generally I'd agree.  If you're going to go with a heavier belt on the A design, just go with the B Design.  With the Belt comes the extra firepower for a battleship engagement.  Of course the B design is virtually a KGV with some slight changes.  The A's belt should be sufficient to stop firepower in the 10in and under gun range at combat ranges, especially as they extend.  And with the exception of....me....no one else is building ships in the 'armored cruiser' range with guns between 10 and 12 inches. 

[The Rock Doctor]

  And with the exception of....me....no one else is building ships in the 'armored cruiser' range with guns between 10 and 12 inches.

It would've been my own preference but I gotta keep up with the Joneses.

[Desertfox]

And with the exception of....me....no one else is building ships in the 'armored cruiser' range with guns between 10 and 12 inches. 

Only because my ACs use 10" and 12"... But if you are using a 30k ship to hunt 10k ACs, thats a waste of resources.

[TacCovert4]

  And with the exception of....me....no one else is building ships in the 'armored cruiser' range with guns between 10 and 12 inches.

It would've been my own preference but I gotta keep up with the Joneses.

Given that I have no hope of keeping up with all you 'joneses' around here....I've just got to be 'that guy' instead.

I started in this game looking forward to building battleships. 

My inner engineer still wants to build battleships.

My inner wargamer has slapped my inner engineer silly with reminders that we can't afford to.

I've gone so far Jeune Ecole even RL France is scratching their heads.

[snip]

And this is why I have a lovely 235mm slotted into my research plan, the 340 is a little big for the hunting job. LAC-17 is going to be a big driver of the fusion of the traditional battleship and Large Armored Cruisers in the class making an appearance in the early 20s. Rather than three ships of about the same size, go to two larger and one smaller.

[TacCovert4]

And this is why I have a lovely 235mm slotted into my research plan, the 340 is a little big for the hunting job. LAC-17 is going to be a big driver of the fusion of the traditional battleship and Large Armored Cruisers in the class making an appearance in the early 20s. Rather than three ships of about the same size, go to two larger and one smaller.

Yep, that 235, when ships with it start getting built, will be a big driver for my own new ships at that point.  It'll open the question on whether I need to develop a gun in the 220-260mm range, or keep using the 280/50, or develop a 280/55 or 280/60.

[Jefgte]

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.