Japanese cruiser design J/CA/1916

The J/CA/1916 design has lighter weight machinery, as the power output was too low with what Springsharp judges to be the normal weight for machinery in 1916. This design has 8-8in guns in twin turrets with an AA armament and torpedo tubes. The speed is now 32 knots and the range is 7,500nm at 15 knots. This is the Springsharp report:

J/CA/1916, Japan Heavy Cruiser laid down 1916 (Engine 1924)

Displacement:
 10,712 t light; 11,114 t standard; 12,300 t normal; 13,249 t full load

Dimensions: Length overall / water x beam x draught
 639.96 ft / 635.00 ft x 61.00 ft x 19.00 ft (normal load)
 195.06 m / 193.55 m x 18.59 m  x 5.79 m

Armament:
      8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1916 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1916 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      16 - 2.24" / 57.0 mm guns (8x2 guns), 5.65lbs / 2.56kg shells, 1916 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 2,266 lbs / 1,028 kg
 Shells per gun, main battery: 120
 12 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.50" / 89 mm 430.00 ft / 131.06 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 104 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 430.00 ft / 131.06 m 16.00 ft / 4.88 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 96,590 shp / 72,056 Kw = 32.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 2,134 tons

Complement:
 583 - 759

Cost:
 £1.732 million / $6.927 million

Distribution of weights at normal displacement:
 Armament: 283 tons, 2.3 %
 Armour: 2,596 tons, 21.1 %
    - Belts: 996 tons, 8.1 %
    - Torpedo bulkhead: 255 tons, 2.1 %
    - Armament: 266 tons, 2.2 %
    - Armour Deck: 1,034 tons, 8.4 %
    - Conning Tower: 46 tons, 0.4 %
 Machinery: 3,181 tons, 25.9 %
 Hull, fittings & equipment: 4,652 tons, 37.8 %
 Fuel, ammunition & stores: 1,588 tons, 12.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   15,122 lbs / 6,859 Kg = 59.1 x 8.0 " / 203 mm shells or 2.0 torpedoes
 Stability (Unstable if below 1.00): 1.26
 Metacentric height 3.6 ft / 1.1 m
 Roll period: 13.5 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.49
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.585
 Length to Beam Ratio: 10.41 : 1
 'Natural speed' for length: 25.20 kts
 Power going to wave formation at top speed: 56 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  28.00 ft / 8.53 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (50 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 20.32 ft / 6.19 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 151.3 %
  - Above water (accommodation/working, high = better): 141.4 %
 Waterplane Area: 27,934 Square feet or 2,595 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 108 lbs/sq ft or 525 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.99
  - Longitudinal: 1.05
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent