Japanese Ship Designs Pre-1912

[Desertfox]

24 built

Kamikaze, Japan Destroyer laid down 1904

Displacement:
   429 t light; 445 t standard; 487 t normal; 520 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (252.12 ft / 250.00 ft) x 24.00 ft x (7.10 / 7.41 ft)
   (76.84 m / 76.20 m) x 7.32 m  x (2.16 / 2.26 m)

Armament:
      2 - 3.00" / 76.2 mm 45.0 cal guns - 13.62lbs / 6.18kg shells, 150 per gun
     Quick firing guns in deck mounts, 1904 Model
     2 x Single mounts on centreline, evenly spread
      12 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 150 per gun
     Quick firing guns in deck mounts, 1904 Model
     4 x Triple mounts on sides, evenly spread
      Weight of broadside 76 lbs / 34 kg
      Main Torpedoes
      4 - 18.0" / 457 mm, 0.00 ft / 0.00 m torpedoes - 0.000 t each, 0.000 t total
   In 4 sets of deck mounted centre rotating tubes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm         -               -

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 8,936 shp / 6,666 Kw = 27.00 kts
   Range 1,500nm at 10.00 kts
   Bunker at max displacement = 74 tons (90% coal)
     Caution: Delicate, lightweight machinery

Complement:
   51 - 67

Cost:
   £0.058 million / $0.230 million

Distribution of weights at normal displacement:
   Armament: 14 tons, 2.8 %
      - Guns: 14 tons, 2.8 %
   Armour: 4 tons, 0.9 %
      - Armament: 4 tons, 0.9 %
   Machinery: 275 tons, 56.5 %
   Hull, fittings & equipment: 112 tons, 23.0 %
   Fuel, ammunition & stores: 57 tons, 11.8 %
   Miscellaneous weights: 24 tons, 4.9 %
      - Hull above water: 10 tons
      - On freeboard deck: 14 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     105 lbs / 47 Kg = 7.7 x 3.0 " / 76 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 0.9 ft / 0.3 m
   Roll period: 10.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 72 %
         - Recoil effect (Restricted arc if above 1.00): 0.17
   Seaboat quality  (Average = 1.00): 0.84

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.400 / 0.409
   Length to Beam Ratio: 10.42 : 1
   'Natural speed' for length: 15.81 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 85
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   30.00 %,  12.00 ft / 3.66 m,  8.00 ft / 2.44 m
      - Forward deck:   30.00 %,  8.00 ft / 2.44 m,  8.00 ft / 2.44 m
      - Aft deck:   25.00 %,  8.00 ft / 2.44 m,  8.00 ft / 2.44 m
      - Quarter deck:   15.00 %,  8.00 ft / 2.44 m,  8.00 ft / 2.44 m
      - Average freeboard:      8.48 ft / 2.58 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 192.8 %
      - Above water (accommodation/working, high = better): 106.0 %
   Waterplane Area: 3,693 Square feet or 343 Square metres
   Displacement factor (Displacement / loading): 27 %
   Structure weight / hull surface area: 20 lbs/sq ft or 97 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.88
      - Overall: 0.53
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

[Kaiser Kirk]

Tsubuka class.

   - Armoured deck - multiple decks:
   For and Aft decks: 2.00" / 51 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

A) more 5" barrels than mounts.

B) Compact ships for the size. Nice.

On the armor deck -
A) is it 2x 25mm decks?
B) is it indeed an 'armored deck' mounted at the top of the main belt? And not turtlebacking behind (just curious)
C) What is the OPFOR shell size it is expecting? Against QF 150mm, 20-30mm is fine. Against 240mm + shell splinters..may not be so good.
I have my own reading based self-rules, which I don't impose on others, but I've been using at least 40mm on Armored cruisers, and 50mm on Predreads, with a deck over the upperbelt to boot.


Other : boy you put up a bunch. I don't have time to look tonight...probably Friday.

[Desertfox]

I was going of off Wikipedia, this is what it says, so I assume its a turtleback?

The thickness of the armored decks ranged in thickness from 1.5 inches on the flat and at the ends of the ship to 2 inches (51 mm) on the slope of the deck.

Slow day at work, plus mostly pre-done designs... I do need to fix the secondaries on a bunch of ships.

[Kaiser Kirk]

That would be a single-thickness protective deck as described.
Unfortunately SS3 does not have a way to present the slopes/deck as thicker/thinner.

While that means no upper deck armor, they really expected the shots to be flat at this time,
so the upper deck wasn't seen as terribly important. 

Plus deck thickness get reported in all sorts of ways. Frequently it's really hard to tell if they are
counting armor plating only, or armorplating + deck plating, etc.

Longer ranges started developing in 1904, and then only for smaller guns with new gun mount gearing.

[Desertfox]

First true oceangoing destroyer class, 24 built.

Image is a bit large, so link instead: https://i.imgur.com/JP1euTg.jpg

Umikaze, Japan Destroyer laid down 1910

Displacement:
   600 t light; 621 t standard; 662 t normal; 695 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (292.64 ft / 290.00 ft) x 27.00 ft x (7.40 / 7.64 ft)
   (89.20 m / 88.39 m) x 8.23 m  x (2.26 / 2.33 m)

Armament:
      5 - 3.00" / 76.2 mm 45.0 cal guns - 13.62lbs / 6.18kg shells, 200 per gun
     Quick firing guns in deck mounts, 1910 Model
     3 x Single mounts on centreline, evenly spread
      1 raised mount
     2 x Single mounts on sides amidships
      Weight of broadside 68 lbs / 31 kg
      Main Torpedoes
      4 - 18.0" / 457 mm, 0.00 ft / 0.00 m torpedoes - 0.000 t each, 0.000 t total
   In 2 sets of deck mounted centre rotating tubes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm         -               -

   - Conning towers: Forward 1.00" / 25 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 15,563 shp / 11,610 Kw = 30.00 kts
   Range 1,700nm at 10.00 kts
   Bunker at max displacement = 74 tons (90% coal)

Complement:
   64 - 84

Cost:
   £0.074 million / $0.294 million

Distribution of weights at normal displacement:
   Armament: 13 tons, 1.9 %
      - Guns: 13 tons, 1.9 %
   Armour: 13 tons, 1.9 %
      - Armament: 11 tons, 1.7 %
      - Conning Tower: 2 tons, 0.2 %
   Machinery: 351 tons, 53.0 %
   Hull, fittings & equipment: 200 tons, 30.2 %
   Fuel, ammunition & stores: 62 tons, 9.3 %
   Miscellaneous weights: 24 tons, 3.6 %
      - Hull above water: 10 tons
      - On freeboard deck: 14 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     197 lbs / 89 Kg = 14.6 x 3.0 " / 76 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.19
   Metacentric height 1.0 ft / 0.3 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.14
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has raised forecastle,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.400 / 0.407
   Length to Beam Ratio: 10.74 : 1
   'Natural speed' for length: 17.03 kts
   Power going to wave formation at top speed: 64 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 10.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   25.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
      - Forward deck:   30.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Aft deck:   30.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Quarter deck:   15.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Average freeboard:      11.25 ft / 3.43 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 178.1 %
      - Above water (accommodation/working, high = better): 137.2 %
   Waterplane Area: 4,820 Square feet or 448 Square metres
   Displacement factor (Displacement / loading): 45 %
   Structure weight / hull surface area: 24 lbs/sq ft or 116 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.45
      - Overall: 0.56
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[Desertfox]

That concludes all the ships I had planned, but still leaves me with some 120 BP, half of that pre-1896. So, any ideas?

[Desertfox]

Fleet Support ship/collier, 10 built. With a combined capability of 400,000t of support, thats more than the current fleet size of ~300,000t.

Kobayashi Maru class, Japan Fleet Support/Collier laid down 1896

Displacement:
   8,004 t light; 8,203 t standard; 9,710 t normal; 10,915 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (400.00 ft / 400.00 ft) x 59.00 ft x (24.00 / 26.50 ft)
   (121.92 m / 121.92 m) x 17.98 m  x (7.32 / 8.08 m)

Armament:
      2 - 3.00" / 76.2 mm 45.0 cal guns - 13.62lbs / 6.18kg shells, 300 per gun
     Breech loading guns in deck mounts, 1896 Model
     2 x Single mounts on centreline ends, evenly spread
      Weight of broadside 27 lbs / 12 kg

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 1 shaft, 4,270 ihp / 3,186 Kw = 14.00 kts
   Range 10,700nm at 10.00 kts
   Bunker at max displacement = 2,712 tons (100% coal)

Complement:
   488 - 635

Cost:
   £0.391 million / $1.565 million

Distribution of weights at normal displacement:
   Armament: 5 tons, 0.0 %
      - Guns: 5 tons, 0.0 %
   Machinery: 784 tons, 8.1 %
   Hull, fittings & equipment: 1,946 tons, 20.0 %
   Fuel, ammunition & stores: 1,706 tons, 17.6 %
   Miscellaneous weights: 5,270 tons, 54.3 %
      - Hull below water: 5,000 tons
      - On freeboard deck: 270 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     13,107 lbs / 5,945 Kg = 970.9 x 3.0 " / 76 mm shells or 1.8 torpedoes
   Stability (Unstable if below 1.00): 2.09
   Metacentric height 7.2 ft / 2.2 m
   Roll period: 9.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.00
   Seaboat quality  (Average = 1.00): 1.60

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.600 / 0.611
   Length to Beam Ratio: 6.78 : 1
   'Natural speed' for length: 20.00 kts
   Power going to wave formation at top speed: 32 %
   Trim (Max stability = 0, Max steadiness = 100): 63
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   30.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Forward deck:   30.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Aft deck:   25.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Quarter deck:   15.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Average freeboard:      11.00 ft / 3.35 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 82.8 %
      - Above water (accommodation/working, high = better): 72.5 %
   Waterplane Area: 16,884 Square feet or 1,569 Square metres
   Displacement factor (Displacement / loading): 142 %
   Structure weight / hull surface area: 78 lbs/sq ft or 380 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.98
      - Longitudinal: 1.25
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Cramped 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

5,000t - 50,00t of fleet support

[Kaiser Kirk]

That concludes all the ships I had planned, but still leaves me with some 120 BP, half of that pre-1896. So, any ideas?

These are hard tons to spend 'wisely'.
Some vessels will be outdated by 1910 and no longer in service.
I concentrated on more utility vessels and expeditionary vessels.
I have sailing frigates for the deep worldwide sealanes - obsolete in most places, but fine in the middle of nowhere.
I have my torpedo boat carriers ala the British Vulcan - which allow me to move TBs around, and will eventually become depot or aviation ships
I have some little coast defense battleships that hide in the inlets of Khasab, but are faster than merchants and so can guard the straits of Hormuz.
I have my little torpedo boats. Slow now, but the same situational role as the CDS. Also still adequate for night attacks.
I have some of my naval support vessels - their role changes little.
I have what were then high speed long range lightly armored cruisers, and now are barely adequate, but still serviceable.

Also what several of us did was build ships in the earlier periods, then pay BP to refit/rebuild them in the mid 1900s.

Fleet Support ship/collier, 10 built. With a combined capability of 400,000t of support, thats more than the current fleet size of ~300,000t.

...and why would you build in 1896 more capacity than you forecast to have for the next decade or more?

[Desertfox]

I am trying to use up that pre-1896 BPs. I figure most support ships will likely be re-purposed or converted civilian ships. So they wouldn't have necessarily all been built in 1896, but they can all be 1896 "vintage" designs as capacity is added throughout the years, as used civilian vessels are bought and converted.

I need to find some of the more obscure Japanese ships out there, the Japanese fleet is hard since most of the OTL ships were relatively new as well.

[Desertfox]

Class of coastal defense ships designed to free up the battleships for more important duties. Only two built as their guns were repurposed for use on the Satsuma class.

Thonburi class, Japan Coastal Battleship laid down 1907

Displacement:
   3,300 t light; 3,558 t standard; 3,786 t normal; 3,969 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (300.00 ft / 300.00 ft) x 50.00 ft x (15.50 / 16.10 ft)
   (91.44 m / 91.44 m) x 15.24 m  x (4.72 / 4.91 m)

Armament:
      4 - 10.00" / 254 mm 45.0 cal guns - 504.26lbs / 228.73kg shells, 140 per gun
     Breech loading guns in turret on barbette mounts, 1907 Model
     2 x Twin mounts on centreline ends, evenly spread
      4 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Breech loading guns in deck and hoist mounts, 1907 Model
     4 x Twin mounts on sides, evenly spread
      12 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 150 per gun
     Quick firing guns in deck mounts, 1907 Model
     4 x Triple mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 2,318 lbs / 1,051 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.00" / 102 mm   210.00 ft / 64.01 m   7.00 ft / 2.13 m
   Ends:   1.00" / 25 mm     90.00 ft / 27.43 m   7.00 ft / 2.13 m
   Upper:   1.00" / 25 mm   210.00 ft / 64.01 m   7.00 ft / 2.13 m
     Main Belt covers 108 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   7.00" / 178 mm   3.00" / 76 mm      7.00" / 178 mm
   2nd:   1.00" / 25 mm         -         1.00" / 25 mm

   - Armoured deck - multiple decks:
   For and Aft decks: 1.00" / 25 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

   - Conning towers: Forward 7.00" / 178 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 5,326 ihp / 3,973 Kw = 17.00 kts
   Range 3,340nm at 10.00 kts
   Bunker at max displacement = 412 tons (90% coal)

Complement:
   240 - 313

Cost:
   £0.411 million / $1.644 million

Distribution of weights at normal displacement:
   Armament: 511 tons, 13.5 %
      - Guns: 511 tons, 13.5 %
   Armour: 813 tons, 21.5 %
      - Belts: 341 tons, 9.0 %
      - Armament: 236 tons, 6.2 %
      - Armour Deck: 199 tons, 5.3 %
      - Conning Tower: 37 tons, 1.0 %
   Machinery: 574 tons, 15.1 %
   Hull, fittings & equipment: 1,302 tons, 34.4 %
   Fuel, ammunition & stores: 486 tons, 12.8 %
   Miscellaneous weights: 100 tons, 2.6 %
      - Hull below water: 50 tons
      - Above deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     3,499 lbs / 1,587 Kg = 7.0 x 10.0 " / 254 mm shells or 1.0 torpedoes
   Stability (Unstable if below 1.00): 1.18
   Metacentric height 2.4 ft / 0.7 m
   Roll period: 13.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.73
   Seaboat quality  (Average = 1.00): 1.23

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.570 / 0.575
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 17.32 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   25.00 %,  14.00 ft / 4.27 m,  10.00 ft / 3.05 m
      - Forward deck:   30.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Aft deck:   30.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Quarter deck:   15.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Average freeboard:      10.40 ft / 3.17 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 103.1 %
      - Above water (accommodation/working, high = better): 84.7 %
   Waterplane Area: 10,667 Square feet or 991 Square metres
   Displacement factor (Displacement / loading): 92 %
   Structure weight / hull surface area: 105 lbs/sq ft or 510 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 2.03
      - Overall: 1.01
   Adequate machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[Desertfox]

Plain ol protected cruiser. Two built, Suma, Akashi.



Suma class, Japan Cruiser laid down 1892

Displacement:
   2,700 t light; 2,818 t standard; 3,226 t normal; 3,553 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (300.00 ft / 300.00 ft) x 41.00 ft x (17.00 / 18.34 ft)
   (91.44 m / 91.44 m) x 12.50 m  x (5.18 / 5.59 m)

Armament:
      2 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 140 per gun
     Breech loading guns in deck mounts, 1892 Model
     2 x Single mounts on centreline ends, evenly spread
      6 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Breech loading guns in deck mounts, 1892 Model
     6 x Single mounts on sides, evenly spread
      4 - 3.00" / 76.2 mm 45.0 cal guns - 13.62lbs / 6.18kg shells, 150 per gun
     Breech loading guns in deck mounts, 1892 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 650 lbs / 295 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   3.00" / 76 mm   1.00" / 25 mm            -
   2nd:   1.00" / 25 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 1.00" / 25 mm

   - Conning towers: Forward 1.00" / 25 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 8,822 ihp / 6,581 Kw = 20.00 kts
   Range 5,150nm at 10.00 kts
   Bunker at max displacement = 735 tons (100% coal)

Complement:
   213 - 278

Cost:
   £0.346 million / $1.385 million

Distribution of weights at normal displacement:
   Armament: 99 tons, 3.1 %
      - Guns: 99 tons, 3.1 %
   Armour: 168 tons, 5.2 %
      - Armament: 34 tons, 1.1 %
      - Armour Deck: 129 tons, 4.0 %
      - Conning Tower: 5 tons, 0.1 %
   Machinery: 1,576 tons, 48.9 %
   Hull, fittings & equipment: 817 tons, 25.3 %
   Fuel, ammunition & stores: 526 tons, 16.3 %
   Miscellaneous weights: 40 tons, 1.2 %
      - On freeboard deck: 40 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,409 lbs / 639 Kg = 13.0 x 6.0 " / 152 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.80
   Metacentric height 3.4 ft / 1.0 m
   Roll period: 9.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.14
   Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.540 / 0.551
   Length to Beam Ratio: 7.32 : 1
   'Natural speed' for length: 17.32 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 55
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Forward deck:   30.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Aft deck:   35.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Quarter deck:   15.00 %,  11.00 ft / 3.35 m,  11.00 ft / 3.35 m
      - Average freeboard:      11.00 ft / 3.35 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 167.6 %
      - Above water (accommodation/working, high = better): 83.7 %
   Waterplane Area: 8,504 Square feet or 790 Square metres
   Displacement factor (Displacement / loading): 83 %
   Structure weight / hull surface area: 65 lbs/sq ft or 316 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.86
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[Kaiser Kirk]

Plain ol protected cruiser. Two built, Suma, Akashi.

   - Protected deck - single deck:
   For and Aft decks: 1.00" / 25 mm

   - Conning towers: Forward 1.00" / 25 mm, Aft 0.00" / 0 mm

With protected cruisers the way some of us model the thicker "slopes" of the deck is to go ahead and have a belt, but put a note in that it's added to the deck.
For example, if you look at the Parthian PCs, you'll see a 3.66m high belt (the slope of the deck at 45deg) which gets added to the deck armor.
...or you can just have a 25mm deck.

[Desertfox]

Four improved protected cruisers with much heavier armament. Belt armor is part of the protected deck.



Takasago, Yoshino, Kasagi, Chitose

Takasago class, Japan Cruiser laid down 1896

Displacement:
   4,303 t light; 4,510 t standard; 5,012 t normal; 5,414 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (390.00 ft / 390.00 ft) x 49.00 ft x (17.00 / 18.07 ft)
   (118.87 m / 118.87 m) x 14.94 m  x (5.18 / 5.51 m)

Armament:
      2 - 8.00" / 203 mm 45.0 cal guns - 258.18lbs / 117.11kg shells, 140 per gun
     Breech loading guns in turret on barbette mounts, 1896 Model
     2 x Single mounts on centreline ends, evenly spread
      10 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Breech loading guns in deck mounts, 1896 Model
     10 x Single mounts on sides, evenly spread
      12 - 3.00" / 76.2 mm 45.0 cal guns - 13.62lbs / 6.18kg shells, 150 per gun
     Breech loading guns in deck mounts, 1896 Model
     12 x Single mounts on sides, evenly spread
      Weight of broadside 1,310 lbs / 594 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.00" / 51 mm   370.00 ft / 112.78 m   10.00 ft / 3.05 m
   Ends:   Unarmoured
     Main Belt covers 146 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   4.00" / 102 mm   1.00" / 25 mm      4.00" / 102 mm
   2nd:   1.00" / 25 mm         -               -

   - Protected deck - single deck:
   For and Aft decks: 2.00" / 51 mm

   - Conning towers: Forward 1.00" / 25 mm, Aft 0.00" / 0 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 10,477 ihp / 7,816 Kw = 20.00 kts
   Range 5,100nm at 10.00 kts
   Bunker at max displacement = 905 tons (100% coal)

Complement:
   297 - 387

Cost:
   £0.506 million / $2.025 million

Distribution of weights at normal displacement:
   Armament: 268 tons, 5.3 %
      - Guns: 268 tons, 5.3 %
   Armour: 783 tons, 15.6 %
      - Belts: 288 tons, 5.8 %
      - Armament: 87 tons, 1.7 %
      - Armour Deck: 401 tons, 8.0 %
      - Conning Tower: 6 tons, 0.1 %
   Machinery: 1,922 tons, 38.4 %
   Hull, fittings & equipment: 1,330 tons, 26.5 %
   Fuel, ammunition & stores: 709 tons, 14.1 %
   Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,820 lbs / 1,279 Kg = 11.0 x 8.0 " / 203 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.63
   Metacentric height 3.9 ft / 1.2 m
   Roll period: 10.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.23
   Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.540 / 0.549
   Length to Beam Ratio: 7.96 : 1
   'Natural speed' for length: 19.75 kts
   Power going to wave formation at top speed: 46 %
   Trim (Max stability = 0, Max steadiness = 100): 55
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Forward deck:   30.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Aft deck:   35.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Quarter deck:   15.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Average freeboard:      10.00 ft / 3.05 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 140.8 %
      - Above water (accommodation/working, high = better): 84.7 %
   Waterplane Area: 13,212 Square feet or 1,227 Square metres
   Displacement factor (Displacement / loading): 92 %
   Structure weight / hull surface area: 79 lbs/sq ft or 384 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.10
      - Overall: 1.00
   Cramped machinery, storage, compartmentation space
   Cramped accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[Desertfox]

Much more modern cruiser design, based on the one I made in the NPC ships thread for the Aztecs (Image):

A more conventional version of the raider, designed as a cruiser version of a "gunboat diplomacy" gunboat. Cheaper than an armored cruiser, faster than a coast defense battleship, bigger than a gunboat, and more intimidating than a light protected cruiser. Can do some raiding, commerce protection,and scouting, but primary role is to show the flag, and intimidate locals. Can carry a decent marine detachment.

2-4 built

Agano class, Japan Cruiser laid down 1910

Displacement:
   4,004 t light; 4,241 t standard; 5,424 t normal; 6,370 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (390.00 ft / 390.00 ft) x 50.00 ft x (17.70 / 20.13 ft)
   (118.87 m / 118.87 m) x 15.24 m  x (5.39 / 6.14 m)

Armament:
      4 - 8.00" / 203 mm 45.0 cal guns - 258.18lbs / 117.11kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1910 Model
     2 x Twin mounts on centreline, evenly spread
      8 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Breech loading guns in deck mounts, 1910 Model
     8 x Single mounts on centreline ends, evenly spread
      Weight of broadside 1,537 lbs / 697 kg
      Main Torpedoes
      4 - 18.0" / 457 mm, 0.00 ft / 0.00 m torpedoes - 0.000 t each, 0.000 t total
   In 2 sets of deck mounted side rotating tubes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.00" / 102 mm   220.00 ft / 67.06 m   10.00 ft / 3.05 m
   Ends:   Unarmoured
     Main Belt covers 87 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   5.00" / 127 mm   1.00" / 25 mm      5.00" / 127 mm
   2nd:   1.00" / 25 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 1.00" / 25 mm
   Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 22,722 shp / 16,950 Kw = 24.00 kts
   Range 7,050nm at 14.00 kts
   Bunker at max displacement = 2,129 tons (90% coal)

Complement:
   315 - 410

Cost:
   £0.404 million / $1.617 million

Distribution of weights at normal displacement:
   Armament: 308 tons, 5.7 %
      - Guns: 308 tons, 5.7 %
   Armour: 801 tons, 14.8 %
      - Belts: 383 tons, 7.1 %
      - Armament: 164 tons, 3.0 %
      - Armour Deck: 254 tons, 4.7 %
   Machinery: 1,023 tons, 18.9 %
   Hull, fittings & equipment: 1,683 tons, 31.0 %
   Fuel, ammunition & stores: 1,420 tons, 26.2 %
   Miscellaneous weights: 190 tons, 3.5 %
      - Hull above water: 50 tons
      - On freeboard deck: 140 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     7,421 lbs / 3,366 Kg = 29.0 x 8.0 " / 203 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 2.6 ft / 0.8 m
   Roll period: 13.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.56
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.568
   Length to Beam Ratio: 7.80 : 1
   'Natural speed' for length: 19.75 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 59
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   30.00 %,  19.00 ft / 5.79 m,  15.00 ft / 4.57 m
      - Forward deck:   30.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
      - Aft deck:   25.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
      - Quarter deck:   15.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
      - Average freeboard:      15.48 ft / 4.72 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 83.9 %
      - Above water (accommodation/working, high = better): 123.3 %
   Waterplane Area: 13,609 Square feet or 1,264 Square metres
   Displacement factor (Displacement / loading): 130 %
   Structure weight / hull surface area: 86 lbs/sq ft or 420 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.95
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

[Desertfox]

Dedicated colony/exploration ship, designed to show up, unload, and support a battalion of troops. Accommodation areas are armored against small arms fire. Alternatively its designed to function as an AMC, troop accommodations would be used for prize crews/prisoners and torpedoes would be carried to sink merchants not worth capturing.

4 built to merchant standards

Aikoku Maru, Japan AMC/Troop Transport laid down 1910

Displacement:
   4,016 t light; 4,134 t standard; 5,141 t normal; 5,946 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (340.00 ft / 340.00 ft) x 49.00 ft x (20.00 / 22.45 ft)
   (103.63 m / 103.63 m) x 14.94 m  x (6.10 / 6.84 m)

Armament:
      2 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Breech loading guns in deck and hoist mounts, 1910 Model
     2 x Single mounts on centreline ends, evenly spread
      4 - 3.00" / 76.2 mm 45.0 cal guns - 13.62lbs / 6.18kg shells, 150 per gun
     Breech loading guns in deck mounts, 1910 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 181 lbs / 82 kg
      Main Torpedoes
      4 - 14.0" / 356 mm, 0.00 ft / 0.00 m torpedoes - 0.000 t each, 0.000 t total
   In 2 sets of deck mounted carriage/fixed tubes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Ends:   Unarmoured
   Upper:   0.50" / 13 mm   200.00 ft / 60.96 m   10.00 ft / 3.05 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm         -         -

   - Conning towers: Forward 1.00" / 25 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 13,705 shp / 10,224 Kw = 21.00 kts
   Range 11,000nm at 11.00 kts
   Bunker at max displacement = 1,812 tons (90% coal)

Complement:
   303 - 394

Cost:
   £0.242 million / $0.967 million

Distribution of weights at normal displacement:
   Armament: 43 tons, 0.8 %
      - Guns: 43 tons, 0.8 %
   Armour: 57 tons, 1.1 %
      - Belts: 44 tons, 0.9 %
      - Armament: 7 tons, 0.1 %
      - Conning Tower: 6 tons, 0.1 %
   Machinery: 617 tons, 12.0 %
   Hull, fittings & equipment: 1,249 tons, 24.3 %
   Fuel, ammunition & stores: 1,125 tons, 21.9 %
   Miscellaneous weights: 2,050 tons, 39.9 %
      - Hull below water: 1,000 tons
      - Hull above water: 900 tons
      - On freeboard deck: 100 tons
      - Above deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     7,126 lbs / 3,232 Kg = 114.0 x 5.0 " / 127 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.36
   Metacentric height 2.9 ft / 0.9 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.07
   Seaboat quality  (Average = 1.00): 1.50

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.540 / 0.557
   Length to Beam Ratio: 6.94 : 1
   'Natural speed' for length: 18.44 kts
   Power going to wave formation at top speed: 55 %
   Trim (Max stability = 0, Max steadiness = 100): 47
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   30.00 %,  17.00 ft / 5.18 m,  15.00 ft / 4.57 m
      - Forward deck:   30.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
      - Aft deck:   25.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
      - Quarter deck:   15.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
      - Average freeboard:      15.24 ft / 4.65 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 82.4 %
      - Above water (accommodation/working, high = better): 108.6 %
   Waterplane Area: 11,519 Square feet or 1,070 Square metres
   Displacement factor (Displacement / loading): 148 %
   Structure weight / hull surface area: 67 lbs/sq ft or 329 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.25
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

50t - 2  x Long-range wireless
100t - 4 x 10-ton landing boats, 10 x Torpedoes
900t - 1 x Battalion (300 marines)