Japanese Ship Designs Pre-1912

[Desertfox]

A small fast scout cruiser. Four built, Mogami, Chikuma, Yahagi, Hirado.

Mogami class, Japan Scout Cruiser laid down 1910

Displacement:
   2,201 t light; 2,290 t standard; 2,738 t normal; 3,096 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (390.00 ft / 390.00 ft) x 42.00 ft x (13.00 / 14.20 ft)
   (118.87 m / 118.87 m) x 12.80 m  x (3.96 / 4.33 m)

Armament:
      5 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 170 per gun
     Quick firing guns in deck and hoist mounts, 1910 Model
     3 x Single mounts on centreline ends, majority aft
      1 raised mount aft - superfiring
     2 x Single mounts on sides amidships
      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 centreline ends, evenly spread
      Weight of broadside 370 lbs / 168 kg
      Main Torpedoes
      8 - 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 side rotating tubes

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

   - Armoured deck - multiple decks:
   For and Aft decks: 0.50" / 13 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 22,336 shp / 16,663 Kw = 27.00 kts
   Range 4,000nm at 14.00 kts
   Bunker at max displacement = 807 tons (90% coal)

Complement:
   189 - 246

Cost:
   £0.251 million / $1.002 million

Distribution of weights at normal displacement:
   Armament: 94 tons, 3.4 %
      - Guns: 94 tons, 3.4 %
   Armour: 106 tons, 3.9 %
      - Armament: 35 tons, 1.3 %
      - Armour Deck: 71 tons, 2.6 %
   Machinery: 1,005 tons, 36.7 %
   Hull, fittings & equipment: 956 tons, 34.9 %
   Fuel, ammunition & stores: 537 tons, 19.6 %
   Miscellaneous weights: 40 tons, 1.5 %
      - On freeboard deck: 40 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,086 lbs / 946 Kg = 33.4 x 5.0 " / 127 mm shells or 0.6 torpedoes
   Stability (Unstable if below 1.00): 1.29
   Metacentric height 2.1 ft / 0.7 m
   Roll period: 12.0 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.30
   Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.450 / 0.466
   Length to Beam Ratio: 9.29 : 1
   'Natural speed' for length: 19.75 kts
   Power going to wave formation at top speed: 56 %
   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 %,  17.00 ft / 5.18 m,  14.00 ft / 4.27 m
      - Forward deck:   30.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
      - Aft deck:   25.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
      - Quarter deck:   15.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
      - Average freeboard:      14.36 ft / 4.38 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 130.3 %
      - Above water (accommodation/working, high = better): 147.3 %
   Waterplane Area: 10,448 Square feet or 971 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 60 lbs/sq ft or 291 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.86
      - Longitudinal: 1.47
      - Overall: 0.90
   Cramped 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

[Desertfox]

That basically does it for all the pre-1897 and post-1908 ships. Still have some 34 BPs to spend in between.

[Desertfox]

Scout and dispatch cruisers, 4 built.



Yodo class, Japan Scout Cruiser laid down 1906

Displacement:
   1,500 t light; 1,565 t standard; 1,834 t normal; 2,049 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (330.00 ft / 330.00 ft) x 34.00 ft x (13.00 / 14.06 ft)
   (100.58 m / 100.58 m) x 10.36 m  x (3.96 / 4.29 m)

Armament:
      4 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 170 per gun
     Quick firing guns in deck mounts, 1906 Model
     4 x Single mounts on centreline, 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, 1906 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 307 lbs / 139 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:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.00" / 25 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 0.50" / 13 mm

   - Conning towers: Forward 0.50" / 13 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 13,548 shp / 10,107 Kw = 25.00 kts
   Range 4,200nm at 11.00 kts
   Bunker at max displacement = 484 tons (90% coal)

Complement:
   139 - 182

Cost:
   £0.190 million / $0.758 million

Distribution of weights at normal displacement:
   Armament: 53 tons, 2.9 %
      - Guns: 53 tons, 2.9 %
   Armour: 46 tons, 2.5 %
      - Armament: 10 tons, 0.6 %
      - Armour Deck: 34 tons, 1.8 %
      - Conning Tower: 2 tons, 0.1 %
   Machinery: 874 tons, 47.7 %
   Hull, fittings & equipment: 510 tons, 27.8 %
   Fuel, ammunition & stores: 334 tons, 18.2 %
   Miscellaneous weights: 18 tons, 1.0 %
      - On freeboard deck: 18 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     813 lbs / 369 Kg = 13.0 x 5.0 " / 127 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.52
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 10.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.15
   Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.440 / 0.455
   Length to Beam Ratio: 9.71 : 1
   'Natural speed' for length: 18.17 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 68
   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:   50.00 %,  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:   5.00 %,  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): 162.4 %
      - Above water (accommodation/working, high = better): 97.2 %
   Waterplane Area: 7,100 Square feet or 660 Square metres
   Displacement factor (Displacement / loading): 86 %
   Structure weight / hull surface area: 47 lbs/sq ft or 230 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.87
      - Longitudinal: 1.20
      - Overall: 0.90
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

10t - Wireless
8t - 4 18" Torpedoes

[Desertfox]

Gunboat, scout, and dispatch cruiser. 4+ built

Chihaya class, Japan Gunboat laid down 1902

Displacement:
   1,125 t light; 1,167 t standard; 1,282 t normal; 1,374 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (300.00 ft / 300.00 ft) x 34.00 ft x (10.00 / 10.50 ft)
   (91.44 m / 91.44 m) x 10.36 m  x (3.05 / 3.20 m)

Armament:
      2 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 170 per gun
     Quick firing guns in deck mounts, 1902 Model
     2 x Single mounts on centreline, 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, 1902 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 181 lbs / 82 kg
      Main Torpedoes
      2 - 18.0" / 457 mm, 0.00 ft / 0.00 m torpedoes - 0.000 t each, 0.000 t total
   In 1 sets of deck mounted side rotating tubes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.50" / 13 mm         -               -

   - Conning towers: Forward 0.50" / 13 mm, Aft 0.00" / 0 mm

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 5,696 ihp / 4,250 Kw = 21.00 kts
   Range 3,000nm at 10.00 kts
   Bunker at max displacement = 207 tons (90% coal)

Complement:
   106 - 139

Cost:
   £0.139 million / $0.555 million

Distribution of weights at normal displacement:
   Armament: 31 tons, 2.4 %
      - Guns: 31 tons, 2.4 %
   Armour: 4 tons, 0.3 %
      - Armament: 3 tons, 0.2 %
      - Conning Tower: 1 tons, 0.1 %
   Machinery: 648 tons, 50.5 %
   Hull, fittings & equipment: 378 tons, 29.5 %
   Fuel, ammunition & stores: 157 tons, 12.3 %
   Miscellaneous weights: 64 tons, 5.0 %
      - On freeboard deck: 64 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     589 lbs / 267 Kg = 9.4 x 5.0 " / 127 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.66
   Metacentric height 2.3 ft / 0.7 m
   Roll period: 9.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 69 %
         - Recoil effect (Restricted arc if above 1.00): 0.08
   Seaboat quality  (Average = 1.00): 1.33

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.440 / 0.449
   Length to Beam Ratio: 8.82 : 1
   'Natural speed' for length: 17.32 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 52
   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:   50.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Forward deck:   30.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Aft deck:   5.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Quarter deck:   15.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Average freeboard:      9.00 ft / 2.74 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 170.3 %
      - Above water (accommodation/working, high = better): 104.2 %
   Waterplane Area: 6,454 Square feet or 600 Square metres
   Displacement factor (Displacement / loading): 69 %
   Structure weight / hull surface area: 42 lbs/sq ft or 203 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 1.06
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Good seaboat, rides out heavy weather easily

50t - Auxilary sail rigging
10t - Spare
4t - 2 18" Torpedoes

[Desertfox]

Very cheap (mercantile standards) exploration ship. Includes extra wireless sets, space for 35 passengers (marines), and two extra boats. The armament includes the marine's rifles and mortars. 8 built.



Uji class, Japan Exploration Ship laid down 1907

Displacement:
   700 t light; 725 t standard; 885 t normal; 1,013 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (270.00 ft / 270.00 ft) x 31.00 ft x (7.40 / 8.20 ft)
   (82.30 m / 82.30 m) x 9.45 m  x (2.26 / 2.50 m)

Armament:
      1 - 3.00" / 76.2 mm 45.0 cal gun - 13.62lbs / 6.18kg shells, 400 per gun
     Quick firing gun in deck mount, 1907 Model
     1 x Single mount on centreline, forward deck centre
      3 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 150 per gun
     Quick firing guns in deck mount, 1907 Model
     1 x Triple mount on centreline, aft deck centre
      1 raised mount
      30 - 0.30" / 7.6 mm 45.0 cal guns - 0.01lbs / 0.01kg shells, 150 per gun
     Breech loading guns in deck mounts, 1907 Model
     30 x Single mounts on sides, evenly spread
      2 - 3.54" / 90.0 mm 20.0 cal guns - 19.94lbs / 9.04kg shells, 150 per gun
     Muzzle loading guns in deck mounts, 1907 Model
     2 x Single mounts on sides amidships
      Weight of broadside 66 lbs / 30 kg

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

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

Machinery:
   Coal and oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 2,161 ihp / 1,612 Kw = 17.00 kts
   Range 5,700nm at 10.00 kts
   Bunker at max displacement = 288 tons (90% coal)

Complement:
   80 - 105

Cost:
   £0.060 million / $0.241 million

Distribution of weights at normal displacement:
   Armament: 8 tons, 0.9 %
      - Guns: 8 tons, 0.9 %
   Armour: 8 tons, 0.9 %
      - Armament: 4 tons, 0.5 %
      - Conning Towers: 4 tons, 0.4 %
   Machinery: 238 tons, 26.9 %
   Hull, fittings & equipment: 320 tons, 36.2 %
   Fuel, ammunition & stores: 185 tons, 20.9 %
   Miscellaneous weights: 125 tons, 14.1 %
      - On freeboard deck: 90 tons
      - Above deck: 35 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     1,479 lbs / 671 Kg = 109.5 x 3.0 " / 76 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.35
   Metacentric height 1.5 ft / 0.4 m
   Roll period: 10.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - 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): 0.500 / 0.516
   Length to Beam Ratio: 8.71 : 1
   'Natural speed' for length: 16.43 kts
   Power going to wave formation at top speed: 42 %
   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:   35.00 %,  11.00 ft / 3.35 m,  9.00 ft / 2.74 m
      - Forward deck:   30.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Aft deck:   20.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Quarter deck:   15.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Average freeboard:      9.28 ft / 2.83 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 91.1 %
      - Above water (accommodation/working, high = better): 119.5 %
   Waterplane Area: 5,577 Square feet or 518 Square metres
   Displacement factor (Displacement / loading): 140 %
   Structure weight / hull surface area: 40 lbs/sq ft or 196 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.99
      - Longitudinal: 1.18
      - Overall: 1.01
   Adequate machinery, storage, compartmentation space
   Adequate 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

35t - 1 x short-range and 1 x long-range wireless
60t - 30 x marines
10t - 5 x person, mortar team
20t - 2 x 5t boats

[Desertfox]

Cheap  (armament + armor < 2%) strategic minelayer, armor is splinter shielding for the mines.

Tokiwa class, Japan Minelayer laid down 1906

Displacement:
   3,000 t light; 3,091 t standard; 3,746 t normal; 4,269 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (390.00 ft / 390.00 ft) x 49.00 ft x (14.00 / 15.45 ft)
   (118.87 m / 118.87 m) x 14.94 m  x (4.27 / 4.71 m)

Armament:
      2 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 170 per gun
     Quick firing guns in deck mounts, 1906 Model
     2 x Single mounts on centreline, 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, 1906 Model
     4 x Single mounts on sides, evenly spread
      Weight of broadside 181 lbs / 82 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Ends:   Unarmoured
   Upper:   0.50" / 13 mm   300.00 ft / 91.44 m   7.00 ft / 2.13 m

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 4,758 ihp / 3,549 Kw = 17.00 kts
   Range 9,400nm at 10.00 kts
   Bunker at max displacement = 1,178 tons (100% coal)

Complement:
   239 - 311

Cost:
   £0.209 million / $0.836 million

Distribution of weights at normal displacement:
   Armament: 31 tons, 0.8 %
      - Guns: 31 tons, 0.8 %
   Armour: 43 tons, 1.1 %
      - Belts: 43 tons, 1.1 %
   Machinery: 680 tons, 18.1 %
   Hull, fittings & equipment: 1,177 tons, 31.4 %
   Fuel, ammunition & stores: 746 tons, 19.9 %
   Miscellaneous weights: 1,070 tons, 28.6 %
      - Hull below water: 500 tons
      - On freeboard deck: 500 tons
      - Above deck: 70 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5,440 lbs / 2,468 Kg = 87.0 x 5.0 " / 127 mm shells or 1.4 torpedoes
   Stability (Unstable if below 1.00): 1.42
   Metacentric height 3.2 ft / 1.0 m
   Roll period: 11.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 1.22

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.490 / 0.506
   Length to Beam Ratio: 7.96 : 1
   'Natural speed' for length: 19.75 kts
   Power going to wave formation at top speed: 35 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   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:   50.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Forward deck:   30.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Aft deck:   5.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Quarter deck:   15.00 %,  9.00 ft / 2.74 m,  9.00 ft / 2.74 m
      - Average freeboard:      9.00 ft / 2.74 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 76.6 %
      - Above water (accommodation/working, high = better): 90.5 %
   Waterplane Area: 12,618 Square feet or 1,172 Square metres
   Displacement factor (Displacement / loading): 147 %
   Structure weight / hull surface area: 70 lbs/sq ft or 342 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.21
      - Longitudinal: 0.94
      - 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

500t - Mines
500t - Extra supplies for long deployments

[Desertfox]

Improved Takasago class PC. Reduced armament, but stuff like wireless, torpedo tubes, extra boats, and space for marines added. Slight speed increase and extra range as well.

4 built.

Chikuma class, Japan Cruiser laid down 1903

Displacement:
   4,000 t light; 4,190 t standard; 4,760 t normal; 5,216 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (402.47 ft / 400.00 ft) x 49.00 ft x (17.00 / 18.22 ft)
   (122.67 m / 121.92 m) x 14.94 m  x (5.18 / 5.55 m)

Armament:
      2 - 8.00" / 203 mm 45.0 cal guns - 258.18lbs / 117.11kg shells, 170 per gun
     Breech loading guns in deck and hoist mounts, 1903 Model
     2 x Single mounts on centreline ends, 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, 1903 Model
     8 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, 1903 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 1,075 lbs / 488 kg
      Main Torpedoes
      4 - 18.0" / 457 mm, 0.00 ft / 0.00 m torpedoes - 0.000 t each, 0.000 t total
   In 1 sets of deck mounted carriage/fixed tubes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   2.00" / 51 mm   352.00 ft / 107.29 m   10.00 ft / 3.05 m
   Ends:   Unarmoured
     Main Belt covers 135 % 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 and oil fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 11,954 ihp / 8,918 Kw = 21.00 kts
   Range 7,000nm at 10.00 kts
   Bunker at max displacement = 1,026 tons (90% coal)

Complement:
   286 - 372

Cost:
   £0.462 million / $1.846 million

Distribution of weights at normal displacement:
   Armament: 220 tons, 4.6 %
      - Guns: 220 tons, 4.6 %
   Armour: 690 tons, 14.5 %
      - Belts: 278 tons, 5.8 %
      - Armament: 48 tons, 1.0 %
      - Armour Deck: 358 tons, 7.5 %
      - Conning Tower: 6 tons, 0.1 %
   Machinery: 1,760 tons, 37.0 %
   Hull, fittings & equipment: 1,139 tons, 23.9 %
   Fuel, ammunition & stores: 760 tons, 16.0 %
   Miscellaneous weights: 190 tons, 4.0 %
      - On freeboard deck: 140 tons
      - Above deck: 50 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     2,559 lbs / 1,161 Kg = 10.0 x 8.0 " / 203 mm shells or 0.7 torpedoes
   Stability (Unstable if below 1.00): 1.51
   Metacentric height 3.5 ft / 1.1 m
   Roll period: 11.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.22
   Seaboat quality  (Average = 1.00): 1.32

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.500 / 0.511
   Length to Beam Ratio: 8.16 : 1
   'Natural speed' for length: 20.00 kts
   Power going to wave formation at top speed: 46 %
   Trim (Max stability = 0, Max steadiness = 100): 54
   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 %,  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:   25.00 %,  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:      10.48 ft / 3.19 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 135.1 %
      - Above water (accommodation/working, high = better): 87.0 %
   Waterplane Area: 13,059 Square feet or 1,213 Square metres
   Displacement factor (Displacement / loading): 93 %
   Structure weight / hull surface area: 66 lbs/sq ft or 324 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.88
      - Longitudinal: 1.02
      - Overall: 0.90
   Caution: Hull subject to strain in open-sea
   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]

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

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

   - 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

That's a Thai name :)
10" guns are in excess of 210mm,
Therefore this needs capital ship architecture.
The minimum upper belt is the minimum hardenable thickness in that era - 90mm.
25mm is not adequate.

[Kaiser Kirk]

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

   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.95
      - Overall: 1.00
   

Curious why you stopped at 1.0 when the 1900 cruiser tech allows 0.9 for cruisers under 6000t ?

[Kaiser Kirk]

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


      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

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 %
   
100t - 4 x 10-ton landing boats, 10 x Torpedoes

Several things to note.
First, don't let Snip see you using the torpedo function of SS3.  That's not how we are doing Torps - they are all listed under Miscellaneous weight.
Two, it says that in the Ship Design Guidelines :)
It also says :
Torpedoes:  Do not use the built in Torpedo utility in SS3. Use these weights instead.
16" (1890 Tech): 1.5 t each
18" (1899 and 1905 techs): 2 t each
21" (1908 tech): 3 t each
21" (1913 tech): 4 t each
24" (1918 tech): 5 t each

So, 10 torpedoes are at least 15 tons.
+43 guns
+57 armor
---
115t
115/4004 = 2.87%  Can't be mercantile construction.

Also, you only need 600t for the 300marines.

Lastly, ultimately things like amphibious invasions will be governed by deployment points, not sending 4, 10 or even 20 of these somewhere.
That said, a bunch of my ships have landing craft and marines because they will be nice story elements. :)

[Kaiser Kirk]

A small fast scout cruiser. Four built, Mogami, Chikuma, Yahagi, Hirado.

Mogami class, Japan Scout Cruiser laid down 1910

      Main Torpedoes
      8 - 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 side rotating tubes

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

   - Armoured deck - multiple decks:
   For and Aft decks: 0.50" / 13 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 22,336 shp / 16,663 Kw = 27.00 kts
   Range 4,000nm at 14.00 kts
   Bunker at max displacement = 807 tons (90% coal)


   Miscellaneous weights: 40 tons, 1.5 %
      - On freeboard deck: 40 tons

A couple of notes.
First, a little odd to have fully armored gun houses for 5" guns.
Second, your 3" aren't QF
Third, the SS3 torp tubes aren't ok.   I don't know if I was missing that in earlier designs or not.
Fourth, "armored deck, multiple deck" means you're splitting that 13mm up.  Also, the difference between an armored deck and a protective deck is the protective usually is only a meter +/- above the waterline- while the armored deck is higher up and so needs a belt to keep shells from passing under it.
With 130% hull used you're at the upper limit of what Walter argued was the max for a protective deck.
Then there's the choice of 13mm. That's actually why I was updating the gun rules to note what the different shell types would do. One can expect that to stop splinters from up to a 78mm shell. A direct hit would depend on range.

Fifth - a second time I've seen 14 knots as cruise.
The first it worked out nicely for 21 days, very good. Seems about right for typical ships.
This one, you're looking at 12 days of using alot of fuel. Typically 10 or 12 knots was used.
On the other hand, for a cramped ship, short fast journeys are better. 
This one's a stylistic choice.

Sixth : I see 40tons of Miscellaneous weight.
25 tons LR radio...
9 tons FC ?
...6 tons left over.. 3x 18" torpedoes ?
I see no explanation for what that IS.

[Kaiser Kirk]

Scout and dispatch cruisers, 4 built.

Yodo class, Japan Scout Cruiser laid down 1906

Displacement:
   1,500 t light; 1,565 t standard; 1,834 t normal; 2,049 t full load


10t - Wireless
8t - 4 18" Torpedoes

Pretty much the same comments. Though you have both deck tubes and misc weight torps.
Nice little design. 

As a caution : BC is getting Destroyer like...it may be 1500 tons, but it's not a destroyer.

[Kaiser Kirk]

Gunboat, scout, and dispatch cruiser. 4+ built

Chihaya class, Japan Gunboat laid down 1902

Displacement:
   1,125 t light; 1,167 t standard; 1,282 t normal; 1,374 t full load

      Main Torpedoes
      2 - 18.0" / 457 mm, 0.00 ft / 0.00 m torpedoes - 0.000 t each, 0.000 t total
   In 1 sets of deck mounted side rotating tubes


50t - Auxilary sail rigging
10t - Spare
4t - 2 18" Torpedoes

No wireless?
The only sailing rig rules we have are from N3 or so. The lowest amount that really does much of anything is half hull speed costs 5% of normal tons. Or 64tons.  With 2/3 underwater and 1/3 above deck.
You're close. I suppose the ship would move a bit, perhaps 5-6kts instead of 9kts.

[Kaiser Kirk]

Cheap  (armament + armor < 2%) strategic minelayer, armor is splinter shielding for the mines.

Tokiwa class, Japan Minelayer laid down 1906

From Naval Construction, Upkeep, and Modifications

Moderators have may require a ship to be built to normal military standards if they believe that the intent of a design is to produce a cheap warship.

The purpose is a dedicated minelayer. Mines are weapons. This is a warship.

Also, from the standpoint of "just waking up", the idea that 6 years ago NPC Japan would have built a minelayer capable of offensive minelaying 4500nm away...
Sorry but no. That does not fit the concept of what the NPCs are.  You can build it your very first turn live.

Just curious, why does it have a full length upper belt, but no lower...and of ineffectual 13mm plating?  What is that supposed to do??

[Kaiser Kirk]

Very cheap (mercantile standards) exploration ship. Includes extra wireless sets, space for 35 passengers (marines), and two extra boats. The armament includes the marine's rifles and mortars. 8 built.

10t - 5 x person, mortar team

It's an interesting technical question. Mortars have been around a very long time, but were large bulky things.
The Russo-Japanese war had extensive trenchwarfare, and the Japanese actually tried bamboo mortars.
The navalism version would have similar events, and you would certainly be aware of it.
But the mortars worked badly and were only an adapted to lob bombs into entrenchments. I.e. the traditional siege use, but on a portable basis.
Which there would be no need for on expeditions.
Only the Germans made some field-portable mortars prior to WWI and not many. 160 or so I think, and not very mobile. More of a howitzer.
That would translate as the developmental arc- some experimental mortars from the 1905 tech, a limited run from the 1910 tech...but
The Stokes, which is really the mortar we think of, was a Great War invention. So 1915 tech.

So, no mortars at sea in 1907. :)