Japanese Design Concepts

[Desertfox]

Japan will be looking at a variety of different capital ship designs going forward after the Fuso class. The logical next step would be the historical Ise class but without knowing where the Chinese are headed, Japan is looking at slower designs. First up is a maximum battleship, basically Agincourt with 14" guns and heavy armor and TDS. Next up will be a minimum design.


Yamato class, Japan Battleship laid down 1916

Displacement:
   32,050 t light; 34,467 t standard; 36,749 t normal; 38,574 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (663.88 ft / 660.00 ft) x 100.00 ft (Bulges 120.00 ft) x (28.00 / 29.35 ft)
   (202.35 m / 201.17 m) x 30.48 m (Bulges 36.58 m)  x (8.53 / 8.95 m)

Armament:
      14 - 14.00" / 356 mm 45.0 cal guns - 1,383.70lbs / 627.63kg shells, 142 per gun
     Breech loading guns in turret on barbette mounts, 1916 Model
     7 x Twin mounts on centreline ends, majority aft
      3 raised mounts - superfiring
      18 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in casemate mounts, 1916 Model
     18 x Single mounts on sides, evenly spread
      10 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in deck mounts, 1916 Model
     10 x Single mounts on sides, evenly spread
      10 raised mounts
      12 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 250 per gun
     Quick firing guns in deck mounts, 1916 Model
     4 x Triple mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 21,185 lbs / 9,609 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   15.0" / 381 mm   400.00 ft / 121.92 m   14.00 ft / 4.27 m
   Ends:   Unarmoured
     Main Belt covers 93 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      3.00" / 76 mm   400.00 ft / 121.92 m   24.00 ft / 7.32 m
   Beam between torpedo bulkheads 80.00 ft / 24.38 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.0" / 381 mm   8.00" / 203 mm      15.0" / 381 mm
   2nd:   2.00" / 51 mm         -               -
   3rd:   1.00" / 25 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 5.00" / 127 mm

   - Conning towers: Forward 15.00" / 381 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 39,333 shp / 29,342 Kw = 21.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 4,107 tons

Complement:
   1,326 - 1,725

Cost:
   £5.269 million / $21.078 million

Distribution of weights at normal displacement:
   Armament: 3,605 tons, 9.8 %
      - Guns: 3,605 tons, 9.8 %
   Armour: 13,082 tons, 35.6 %
      - Belts: 3,705 tons, 10.1 %
      - Torpedo bulkhead: 1,066 tons, 2.9 %
      - Armament: 4,685 tons, 12.7 %
      - Armour Deck: 3,269 tons, 8.9 %
      - Conning Tower: 357 tons, 1.0 %
   Machinery: 1,465 tons, 4.0 %
   Hull, fittings & equipment: 13,238 tons, 36.0 %
   Fuel, ammunition & stores: 4,698 tons, 12.8 %
   Miscellaneous weights: 660 tons, 1.8 %
      - Hull below water: 200 tons
      - On freeboard deck: 100 tons
      - Above deck: 360 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     54,132 lbs / 24,554 Kg = 39.5 x 14.0 " / 356 mm shells or 11.3 torpedoes
   Stability (Unstable if below 1.00): 1.18
   Metacentric height 6.8 ft / 2.1 m
   Roll period: 19.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.49
   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): 0.580 / 0.581
   Length to Beam Ratio: 5.50 : 1
   'Natural speed' for length: 25.69 kts
   Power going to wave formation at top speed: 41 %
   Trim (Max stability = 0, Max steadiness = 100): 58
   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 %,  22.00 ft / 6.71 m,  17.00 ft / 5.18 m
      - Forward deck:   20.00 %,  17.00 ft / 5.18 m,  19.00 ft / 5.79 m
      - Aft deck:   35.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
      - Quarter deck:   15.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
      - Average freeboard:      18.80 ft / 5.73 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 77.6 %
      - Above water (accommodation/working, high = better): 126.8 %
   Waterplane Area: 47,376 Square feet or 4,401 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 219 lbs/sq ft or 1,067 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.22
      - Overall: 1.00
   Excellent 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

360t for 1908  FC
10t for Long-range wireless and flagship facilities
200t for Enhanced Damage Control

[Desertfox]

And minimum, half the cost, twice the targets.

Mushai class, Japan Battleship laid down 1916

Displacement:
   16,230 t light; 17,374 t standard; 18,867 t normal; 20,061 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (583.88 ft / 580.00 ft) x 90.00 ft x (23.00 / 24.15 ft)
   (177.97 m / 176.78 m) x 27.43 m  x (7.01 / 7.36 m)

Armament:
      6 - 14.00" / 356 mm 45.0 cal guns - 1,383.70lbs / 627.63kg shells, 142 per gun
     Breech loading guns in turret on barbette mounts, 1916 Model
     3 x Twin mounts on centreline ends, majority aft
      1 raised mount aft - superfiring
      12 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in casemate mounts, 1916 Model
     12 x Single mounts on sides, evenly spread
      8 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in deck mounts, 1916 Model
     8 x Single mounts on sides, evenly spread
      8 raised mounts
      12 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 250 per gun
     Quick firing guns in deck mounts, 1916 Model
     4 x Triple mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 9,611 lbs / 4,360 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   300.00 ft / 91.44 m   14.00 ft / 4.27 m
   Ends:   Unarmoured
     Main Belt covers 80 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.00" / 25 mm   300.00 ft / 91.44 m   24.00 ft / 7.32 m
   Beam between torpedo bulkheads 70.00 ft / 21.34 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm   7.00" / 178 mm      12.0" / 305 mm
   2nd:   2.00" / 51 mm         -               -
   3rd:   1.00" / 25 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 3.00" / 76 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 26,285 shp / 19,609 Kw = 21.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 2,686 tons

Complement:
   804 - 1,046

Cost:
   £2.523 million / $10.094 million

Distribution of weights at normal displacement:
   Armament: 1,637 tons, 8.7 %
      - Guns: 1,637 tons, 8.7 %
   Armour: 5,772 tons, 30.6 %
      - Belts: 2,314 tons, 12.3 %
      - Torpedo bulkhead: 266 tons, 1.4 %
      - Armament: 1,504 tons, 8.0 %
      - Armour Deck: 1,504 tons, 8.0 %
      - Conning Tower: 183 tons, 1.0 %
   Machinery: 979 tons, 5.2 %
   Hull, fittings & equipment: 7,571 tons, 40.1 %
   Fuel, ammunition & stores: 2,637 tons, 14.0 %
   Miscellaneous weights: 270 tons, 1.4 %
      - On freeboard deck: 100 tons
      - Above deck: 170 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     33,990 lbs / 15,418 Kg = 24.8 x 14.0 " / 356 mm shells or 6.2 torpedoes
   Stability (Unstable if below 1.00): 1.23
   Metacentric height 6.2 ft / 1.9 m
   Roll period: 15.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.55
   Seaboat quality  (Average = 1.00): 1.37

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.557
   Length to Beam Ratio: 6.44 : 1
   'Natural speed' for length: 24.08 kts
   Power going to wave formation at top speed: 41 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   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 %,  22.00 ft / 6.71 m,  20.00 ft / 6.10 m
      - Forward deck:   25.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
      - Aft deck:   30.00 %,  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:      17.54 ft / 5.35 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 75.8 %
      - Above water (accommodation/working, high = better): 144.4 %
   Waterplane Area: 36,430 Square feet or 3,384 Square metres
   Displacement factor (Displacement / loading): 118 %
   Structure weight / hull surface area: 170 lbs/sq ft or 830 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.45
      - Overall: 1.00
   Excellent 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

170t for 1908  FC
100t for Long-range wireless and flagship facilities

[Jefgte]

The first is too big, the second is too small...

IMO, built a Kawachi class with 5T2x356.

[Desertfox]

That is my current plan, but I am hampered by not having any insight into what China is planning on building. That is why the Japanese are working on multiple possible designs to have at the ready for when more is known.

[Desertfox]

A Fisher Folly style battlecruiser capable of operating on shallow waters and supporting destroyers.

Kii class, Japan Battlecruiser laid down 1916

Displacement:
   16,548 t light; 17,476 t standard; 19,008 t normal; 20,234 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (724.23 ft / 720.00 ft) x 80.00 ft x (21.00 / 22.07 ft)
   (220.75 m / 219.46 m) x 24.38 m  x (6.40 / 6.73 m)

Armament:
      4 - 14.00" / 356 mm 45.0 cal guns - 1,383.70lbs / 627.63kg shells, 142 per gun
     Breech loading guns in turret on barbette mounts, 1916 Model
     2 x Twin mounts on centreline ends, evenly spread
      12 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in casemate mounts, 1916 Model
     12 x Single mounts on sides, evenly spread
      8 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in deck mounts, 1916 Model
     8 x Single mounts on sides, evenly spread
      8 raised mounts
      12 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 250 per gun
     Quick firing guns in deck mounts, 1916 Model
     4 x Triple mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 6,844 lbs / 3,104 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   4.00" / 102 mm   500.00 ft / 152.40 m   14.00 ft / 4.27 m
   Ends:   Unarmoured
     Main Belt covers 107 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.00" / 25 mm   500.00 ft / 152.40 m   24.00 ft / 7.32 m
   Beam between torpedo bulkheads 70.00 ft / 21.34 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   10.0" / 254 mm   5.00" / 127 mm      10.0" / 254 mm
   2nd:   2.00" / 51 mm         -               -
   3rd:   1.00" / 25 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 2.00" / 51 mm

   - Conning towers: Forward 10.00" / 254 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 94,094 shp / 70,194 Kw = 30.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 2,757 tons

Complement:
   809 - 1,052

Cost:
   £2.698 million / $10.793 million

Distribution of weights at normal displacement:
   Armament: 1,167 tons, 6.1 %
      - Guns: 1,167 tons, 6.1 %
   Armour: 3,637 tons, 19.1 %
      - Belts: 1,152 tons, 6.1 %
      - Torpedo bulkhead: 444 tons, 2.3 %
      - Armament: 781 tons, 4.1 %
      - Armour Deck: 1,107 tons, 5.8 %
      - Conning Tower: 153 tons, 0.8 %
   Machinery: 3,506 tons, 18.4 %
   Hull, fittings & equipment: 8,018 tons, 42.2 %
   Fuel, ammunition & stores: 2,460 tons, 12.9 %
   Miscellaneous weights: 220 tons, 1.2 %
      - On freeboard deck: 100 tons
      - Above deck: 120 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     23,517 lbs / 10,667 Kg = 17.1 x 14.0 " / 356 mm shells or 3.4 torpedoes
   Stability (Unstable if below 1.00): 1.17
   Metacentric height 4.8 ft / 1.5 m
   Roll period: 15.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.49
   Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.557
   Length to Beam Ratio: 9.00 : 1
   'Natural speed' for length: 26.83 kts
   Power going to wave formation at top speed: 50 %
   Trim (Max stability = 0, Max steadiness = 100): 67
   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 %,  24.00 ft / 7.32 m,  17.00 ft / 5.18 m
      - Forward deck:   25.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
      - Aft deck:   30.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
      - Quarter deck:   15.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
      - Average freeboard:      17.84 ft / 5.44 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 101.4 %
      - Above water (accommodation/working, high = better): 160.9 %
   Waterplane Area: 40,198 Square feet or 3,735 Square metres
   Displacement factor (Displacement / loading): 116 %
   Structure weight / hull surface area: 154 lbs/sq ft or 754 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 1.10
      - Longitudinal: 0.97
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

120t for 1908  FC
100t for Long-range wireless and flagship facilities

[Desertfox]

Tone-style battleship with 10 MTB Type B in the back instead of seaplanes.

Shinano class, Japan Battleship laid down 1916

Displacement:
   17,881 t light; 19,283 t standard; 20,861 t normal; 22,123 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (593.88 ft / 590.00 ft) x 90.00 ft x (25.00 / 26.19 ft)
   (181.01 m / 179.83 m) x 27.43 m  x (7.62 / 7.98 m)

Armament:
      8 - 14.00" / 356 mm 45.0 cal guns - 1,383.70lbs / 627.63kg shells, 142 per gun
     Breech loading guns in turret on barbette mounts, 1916 Model
     4 x Twin mounts on centreline, forward evenly spread
      1 raised mount
      12 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in casemate mounts, 1916 Model
     12 x Single mounts on sides, evenly spread
      8 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in deck mounts, 1916 Model
     8 x Single mounts on sides, evenly spread
      8 raised mounts
      12 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 250 per gun
     Quick firing guns in deck mounts, 1916 Model
     4 x Triple mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 12,379 lbs / 5,615 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   340.00 ft / 103.63 m   14.00 ft / 4.27 m
   Ends:   Unarmoured
     Main Belt covers 89 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.00" / 25 mm   340.00 ft / 103.63 m   24.00 ft / 7.32 m
   Beam between torpedo bulkheads 70.00 ft / 21.34 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm   7.00" / 178 mm      12.0" / 305 mm
   2nd:   2.00" / 51 mm         -               -
   3rd:   1.00" / 25 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 2.00" / 51 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 27,644 shp / 20,622 Kw = 21.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 2,840 tons

Complement:
   867 - 1,128

Cost:
   £3.052 million / $12.208 million

Distribution of weights at normal displacement:
   Armament: 2,107 tons, 10.1 %
      - Guns: 2,107 tons, 10.1 %
   Armour: 5,871 tons, 28.1 %
      - Belts: 2,545 tons, 12.2 %
      - Torpedo bulkhead: 302 tons, 1.4 %
      - Armament: 2,007 tons, 9.6 %
      - Armour Deck: 821 tons, 3.9 %
      - Conning Tower: 196 tons, 0.9 %
   Machinery: 1,030 tons, 4.9 %
   Hull, fittings & equipment: 8,063 tons, 38.6 %
   Fuel, ammunition & stores: 2,980 tons, 14.3 %
   Miscellaneous weights: 810 tons, 3.9 %
      - Hull above water: 400 tons
      - On freeboard deck: 200 tons
      - Above deck: 210 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     30,554 lbs / 13,859 Kg = 22.3 x 14.0 " / 356 mm shells or 5.2 torpedoes
   Stability (Unstable if below 1.00): 1.13
   Metacentric height 5.3 ft / 1.6 m
   Roll period: 16.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.74
   Seaboat quality  (Average = 1.00): 1.23

Hull form characteristics:
   Hull has low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.557
   Length to Beam Ratio: 6.56 : 1
   'Natural speed' for length: 24.29 kts
   Power going to wave formation at top speed: 41 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   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 %,  22.00 ft / 6.71 m,  17.00 ft / 5.18 m
      - Forward deck:   20.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
      - Aft deck:   20.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
      - Quarter deck:   30.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Average freeboard:      15.50 ft / 4.72 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 86.8 %
      - Above water (accommodation/working, high = better): 138.4 %
   Waterplane Area: 37,058 Square feet or 3,443 Square metres
   Displacement factor (Displacement / loading): 109 %
   Structure weight / hull surface area: 181 lbs/sq ft or 885 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.97
      - Longitudinal: 1.37
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

210t for 1908  FC
100t for Long-range wireless and flagship facilities
400t for 10 x MTB Type B

[Desertfox]

And the Tone-style design but with a heavy secondary instead of the MTBs.

Shinano class, Japan Battleship laid down 1916

Displacement:
   18,602 t light; 20,164 t standard; 21,779 t normal; 23,071 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (593.88 ft / 590.00 ft) x 90.00 ft x (26.10 / 27.32 ft)
   (181.01 m / 179.83 m) x 27.43 m  x (7.96 / 8.33 m)

Armament:
      8 - 14.00" / 356 mm 45.0 cal guns - 1,383.70lbs / 627.63kg shells, 142 per gun
     Breech loading guns in turret on barbette mounts, 1916 Model
     4 x Twin mounts on centreline, forward evenly spread
      1 raised mount
      8 - 8.00" / 203 mm 45.0 cal guns - 258.18lbs / 117.11kg shells, 150 per gun
     Breech loading guns in turret on barbette mounts, 1916 Model
     2 x Twin mounts on centreline, aft deck forward
      1 raised mount - superfiring
     2 x Twin mounts on sides, aft deck forward
      14 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in deck mounts, 1916 Model
     14 x Single mounts on sides, evenly spread
      4 raised mounts
      12 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 250 per gun
     Quick firing guns in deck mounts, 1916 Model
     4 x Triple mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 14,066 lbs / 6,380 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   340.00 ft / 103.63 m   14.00 ft / 4.27 m
   Ends:   Unarmoured
     Main Belt covers 89 % of normal length
     Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.00" / 25 mm   340.00 ft / 103.63 m   24.00 ft / 7.32 m
   Beam between torpedo bulkheads 70.00 ft / 21.34 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm   7.00" / 178 mm      12.0" / 305 mm
   2nd:   5.00" / 127 mm   1.00" / 25 mm      5.00" / 127 mm
   3rd:   1.00" / 25 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 2.00" / 51 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 28,305 shp / 21,116 Kw = 21.00 kts
   Range 7,100nm at 14.00 kts
   Bunker at max displacement = 2,907 tons

Complement:
   896 - 1,165

Cost:
   £3.386 million / $13.546 million

Distribution of weights at normal displacement:
   Armament: 2,505 tons, 11.5 %
      - Guns: 2,505 tons, 11.5 %
   Armour: 6,196 tons, 28.5 %
      - Belts: 2,545 tons, 11.7 %
      - Torpedo bulkhead: 302 tons, 1.4 %
      - Armament: 2,326 tons, 10.7 %
      - Armour Deck: 821 tons, 3.8 %
      - Conning Tower: 202 tons, 0.9 %
   Machinery: 1,055 tons, 4.8 %
   Hull, fittings & equipment: 8,437 tons, 38.7 %
   Fuel, ammunition & stores: 3,176 tons, 14.6 %
   Miscellaneous weights: 410 tons, 1.9 %
      - On freeboard deck: 200 tons
      - Above deck: 210 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     29,328 lbs / 13,303 Kg = 21.4 x 14.0 " / 356 mm shells or 4.9 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 5.0 ft / 1.5 m
   Roll period: 16.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.86
   Seaboat quality  (Average = 1.00): 1.22

Hull form characteristics:
   Hull has low quarterdeck ,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.557
   Length to Beam Ratio: 6.56 : 1
   'Natural speed' for length: 24.29 kts
   Power going to wave formation at top speed: 41 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   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 %,  22.00 ft / 6.71 m,  17.00 ft / 5.18 m
      - Forward deck:   20.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
      - Aft deck:   20.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
      - Quarter deck:   30.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
      - Average freeboard:      15.50 ft / 4.72 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 90.5 %
      - Above water (accommodation/working, high = better): 133.9 %
   Waterplane Area: 37,058 Square feet or 3,443 Square metres
   Displacement factor (Displacement / loading): 105 %
   Structure weight / hull surface area: 191 lbs/sq ft or 931 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.96
      - Longitudinal: 1.43
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

210t for 1908  FC
100t for Long-range wireless and flagship facilities
400t for 10 x MTB Type B

[Desertfox]

A potential refit of the Tsukubas with new engines. Unlikely due to cost.

Tsukuba class, Japan Battlecruiser laid down 1905 (Engine 1915)

Displacement:
   12,071 t light; 12,793 t standard; 14,488 t normal; 15,844 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (479.83 ft / 470.00 ft) x 74.00 ft x (27.00 / 28.97 ft)
   (146.25 m / 143.26 m) x 22.56 m  x (8.23 / 8.83 m)

Armament:
      4 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 140 per gun
     Breech loading guns in turret on barbette mounts, 1905 Model
     2 x Twin mounts on centreline ends, evenly spread
      12 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 145 per gun
     Breech loading guns in casemate mounts, 1905 Model
     12 x Twin mounts on sides, evenly spread
      8 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in deck mounts, 1905 Model
     8 x Single mounts on sides, evenly spread
      8 raised mounts
      12 - 3.00" / 76.2 mm 45.0 cal guns - 13.62lbs / 6.18kg shells, 150 per gun
     Quick firing guns in deck mounts, 1905 Model
     12 x Single mounts on sides, evenly spread
      12 raised mounts
      Weight of broadside 5,460 lbs / 2,477 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   9.00" / 229 mm   310.00 ft / 94.49 m   11.00 ft / 3.35 m
   Ends:   4.00" / 102 mm   160.00 ft / 48.77 m   11.00 ft / 3.35 m
   Upper:   4.00" / 102 mm   310.00 ft / 94.49 m   10.00 ft / 3.05 m
     Main Belt covers 101 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm   4.00" / 102 mm      9.00" / 229 mm
   3rd:   1.00" / 25 mm         -               -

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

   - Conning towers: Forward 9.00" / 229 mm, Aft 4.00" / 102 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 64,032 shp / 47,768 Kw = 27.00 kts
   Range 7,000nm at 14.00 kts
   Bunker at max displacement = 3,051 tons (90% coal)

Complement:
   659 - 858

Cost:
   £1.212 million / $4.847 million

Distribution of weights at normal displacement:
   Armament: 902 tons, 6.2 %
      - Guns: 902 tons, 6.2 %
   Armour: 3,668 tons, 25.3 %
      - Belts: 2,128 tons, 14.7 %
      - Armament: 595 tons, 4.1 %
      - Armour Deck: 779 tons, 5.4 %
      - Conning Towers: 166 tons, 1.1 %
   Machinery: 2,642 tons, 18.2 %
   Hull, fittings & equipment: 4,770 tons, 32.9 %
   Fuel, ammunition & stores: 2,417 tons, 16.7 %
   Miscellaneous weights: 90 tons, 0.6 %
      - Above deck: 90 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     16,699 lbs / 7,575 Kg = 19.3 x 12.0 " / 305 mm shells or 2.1 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 3.8 ft / 1.2 m
   Roll period: 15.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.65
   Seaboat quality  (Average = 1.00): 1.00

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.540 / 0.550
   Length to Beam Ratio: 6.35 : 1
   'Natural speed' for length: 21.68 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 20.00 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 %,  27.00 ft / 8.23 m,  20.00 ft / 6.10 m
      - Forward deck:   30.00 %,  20.00 ft / 6.10 m,  19.00 ft / 5.79 m
      - Aft deck:   25.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
      - Quarter deck:   15.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
      - Average freeboard:      20.29 ft / 6.18 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 86.9 %
      - Above water (accommodation/working, high = better): 134.0 %
   Waterplane Area: 24,046 Square feet or 2,234 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 139 lbs/sq ft or 678 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 2.64
      - Overall: 1.05
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

90t - 1908 Fire Control
50t - Long-range wireless and flagship accomodations

[Desertfox]

A battleship capable of fighting two enemy battleships at the same time, complete with dual FC systems.

Rolling Thunderi class, Japan Battleship laid down 1915

Displacement:
   21,390 t light; 23,083 t standard; 24,552 t normal; 25,727 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (624.23 ft / 620.00 ft) x 90.00 ft x (28.00 / 29.06 ft)
   (190.27 m / 188.98 m) x 27.43 m  x (8.53 / 8.86 m)

Armament:
      16 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 140 per gun
     Breech loading guns in turret on barbette mounts, 1915 Model
     8 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      12 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in casemate mounts, 1915 Model
     12 x Single mounts on sides, evenly spread
      8 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in deck mounts, 1915 Model
     8 x Single mounts on sides, evenly spread
      8 raised mounts
      12 - 3.00" / 76.2 mm 45.0 cal guns - 13.62lbs / 6.18kg shells, 140 per gun
     Quick firing guns in deck mounts, 1915 Model
     12 x Single mounts on sides, evenly spread
      6 raised mounts
      Weight of broadside 15,366 lbs / 6,970 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   370.00 ft / 112.78 m   14.00 ft / 4.27 m
   Ends:   Unarmoured
     Main Belt covers 92 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
      1.00" / 25 mm   370.00 ft / 112.78 m   24.00 ft / 7.32 m
   Beam between torpedo bulkheads 70.00 ft / 21.34 m

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm   7.00" / 178 mm      12.0" / 305 mm
   2nd:   2.00" / 51 mm         -               -
   3rd:   1.00" / 25 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 3.00" / 76 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 29,912 shp / 22,314 Kw = 21.00 kts
   Range 5,700nm at 14.00 kts
   Bunker at max displacement = 2,644 tons

Complement:
   979 - 1,274

Cost:
   £3.312 million / $13.247 million

Distribution of weights at normal displacement:
   Armament: 2,728 tons, 11.1 %
      - Guns: 2,728 tons, 11.1 %
   Armour: 7,871 tons, 32.1 %
      - Belts: 2,725 tons, 11.1 %
      - Torpedo bulkhead: 329 tons, 1.3 %
      - Armament: 3,411 tons, 13.9 %
      - Armour Deck: 1,187 tons, 4.8 %
      - Conning Tower: 218 tons, 0.9 %
   Machinery: 1,133 tons, 4.6 %
   Hull, fittings & equipment: 9,049 tons, 36.9 %
   Fuel, ammunition & stores: 3,162 tons, 12.9 %
   Miscellaneous weights: 610 tons, 2.5 %
      - On freeboard deck: 50 tons
      - Above deck: 560 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     35,595 lbs / 16,146 Kg = 41.2 x 12.0 " / 305 mm shells or 5.6 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 5.2 ft / 1.6 m
   Roll period: 16.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 55 %
         - Recoil effect (Restricted arc if above 1.00): 0.87
   Seaboat quality  (Average = 1.00): 1.43

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.555
   Length to Beam Ratio: 6.89 : 1
   'Natural speed' for length: 24.90 kts
   Power going to wave formation at top speed: 40 %
   Trim (Max stability = 0, Max steadiness = 100): 38
   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:   50.00 %,  24.00 ft / 7.32 m,  19.00 ft / 5.79 m
      - Forward deck:   20.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
      - Aft deck:   15.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
      - Quarter deck:   15.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
      - Average freeboard:      20.00 ft / 6.10 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 86.5 %
      - Above water (accommodation/working, high = better): 144.0 %
   Waterplane Area: 38,942 Square feet or 3,618 Square metres
   Displacement factor (Displacement / loading): 103 %
   Structure weight / hull surface area: 183 lbs/sq ft or 895 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.50
      - Overall: 1.00
   Adequate machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Good seaboat, rides out heavy weather easily

560t for duplicate 1908  FC
50t for Long-range wireless and flagship facilities

[TacCovert4]

1)  That is very Japanese, planning to fight 2 ships at once.

2)  That is highly......erm....not sure what the right word for it would be.

[The Rock Doctor]

Wouldn't be enough deck space for eight turrets.

[Jefgte]

Wouldn't be enough deck space for eight turrets.

HMS Agincourt was 204m length with 7 turrets & 2 superfiring.

If you design this BB with compact superstructures, that's perhaps possible to have 8 centerline turrets & 2 superfiring.
but, on a 204m hull.

You could built this armament on a 190m hull with 8 turrets & 4 superfiring.
A kind of original Huyga/Ise look with 4 groups of 2 turrets.

[snip]

and with only 92% of normal belt, at least 2 of those turrets are outside of armor.

[Desertfox]

But quantity has a quality all of its own... How small can we make a dreadnought?

Pocket Battleship, Japan Battleship laid down 1915

Displacement:
   11,369 t light; 12,253 t standard; 13,200 t normal; 13,958 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (503.53 ft / 500.00 ft) x 70.00 ft x (24.00 / 25.09 ft)
   (153.47 m / 152.40 m) x 21.34 m  x (7.32 / 7.65 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 140 per gun
     Breech loading guns in turret on barbette mounts, 1915 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      10 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in casemate mounts, 1915 Model
     10 x Single mounts on sides, evenly spread
      4 - 5.00" / 127 mm 45.0 cal guns - 63.03lbs / 28.59kg shells, 150 per gun
     Quick firing guns in deck mounts, 1915 Model
     4 x Single mounts on sides, evenly spread
      4 raised mounts
      12 - 2.00" / 50.8 mm 45.0 cal guns - 4.03lbs / 1.83kg shells, 140 per gun
     Quick firing guns in deck mounts, 1915 Model
     4 x Triple mounts on sides, evenly spread
      4 raised mounts
      Weight of broadside 7,902 lbs / 3,584 kg

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   11.0" / 279 mm   270.00 ft / 82.30 m   14.00 ft / 4.27 m
   Ends:   Unarmoured
     Main Belt covers 83 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   11.0" / 279 mm   5.00" / 127 mm      11.0" / 279 mm
   2nd:   1.00" / 25 mm         -               -
   3rd:   1.00" / 25 mm         -               -

   - Armoured deck - multiple decks:
   For and Aft decks: 2.00" / 51 mm

   - Conning towers: Forward 11.00" / 279 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 21,498 shp / 16,037 Kw = 21.00 kts
   Range 5,400nm at 14.00 kts
   Bunker at max displacement = 1,705 tons

Complement:
   615 - 800

Cost:
   £1.756 million / $7.025 million

Distribution of weights at normal displacement:
   Armament: 1,401 tons, 10.6 %
      - Guns: 1,401 tons, 10.6 %
   Armour: 3,856 tons, 29.2 %
      - Belts: 1,854 tons, 14.0 %
      - Armament: 1,373 tons, 10.4 %
      - Armour Deck: 496 tons, 3.8 %
      - Conning Tower: 132 tons, 1.0 %
   Machinery: 814 tons, 6.2 %
   Hull, fittings & equipment: 5,098 tons, 38.6 %
   Fuel, ammunition & stores: 1,831 tons, 13.9 %
   Miscellaneous weights: 200 tons, 1.5 %
      - On freeboard deck: 50 tons
      - Above deck: 150 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     17,529 lbs / 7,951 Kg = 20.3 x 12.0 " / 305 mm shells or 2.6 torpedoes
   Stability (Unstable if below 1.00): 1.06
   Metacentric height 3.3 ft / 1.0 m
   Roll period: 16.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 1.05
   Seaboat quality  (Average = 1.00): 1.37

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.550 / 0.556
   Length to Beam Ratio: 7.14 : 1
   'Natural speed' for length: 22.36 kts
   Power going to wave formation at top speed: 45 %
   Trim (Max stability = 0, Max steadiness = 100): 37
   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:   50.00 %,  20.00 ft / 6.10 m,  15.00 ft / 4.57 m
      - Forward deck:   20.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
      - Aft deck:   15.00 %,  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:      16.00 ft / 4.88 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 69.5 %
      - Above water (accommodation/working, high = better): 113.5 %
   Waterplane Area: 24,426 Square feet or 2,269 Square metres
   Displacement factor (Displacement / loading): 107 %
   Structure weight / hull surface area: 159 lbs/sq ft or 775 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.94
      - Longitudinal: 1.76
      - Overall: 1.00
   Excellent machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Good seaboat, rides out heavy weather easily

150t for 1908  FC
50t for Long-range wireless and flagship facilities

[maddox]

Smallest dreadnought, Espana class.