The J/DD/1927 design

The J/DD/1927 design is a great improvement over its smaller predecessors. The armament is now 6-4.7in QF guns, in twin mounts, and 9-24in TT. The speed and range are the same as the 1921 design, 35 knots maximum speed with a 4,500nm range at 15 knots. This ship suffers from the fact that the Springsharp power calculation overstates what a destroyer would need to make particular speed. This is the Springsharp report:

J/DD/1927, Japan Destroyer laid down 1927 (Engine 1937)

Displacement:
 1,741 t light; 1,780 t standard; 1,990 t normal; 2,158 t full load

Dimensions: Length overall / water x beam x draught
 357.31 ft / 355.00 ft x 33.00 ft x 13.00 ft (normal load)
 108.91 m / 108.20 m x 10.06 m  x 3.96 m

Armament:
      6 - 4.70" / 119 mm guns (3x2 guns), 51.91lbs / 23.55kg shells, 1927 Model
   Quick firing guns in deck mounts with hoists
   on centreline, evenly spread
   Aft Main mounts separated by engine room
      1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1927 Model
   Anti-aircraft gun in a deck mount with hoist
   on side amidships, 1 raised gun
      8 - 2.24" / 57.0 mm guns (4x2 guns), 5.65lbs / 2.56kg shells, 1927 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, 2 raised mounts - superfiring
 Weight of broadside 370 lbs / 168 kg
 Shells per gun, main battery: 0
 9 - 24.0" / 609.6 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 56,041 shp / 41,806 Kw = 35.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 377 tons

Complement:
 148 - 193

Cost:
 £0.928 million / $3.712 million

Distribution of weights at normal displacement:
 Armament: 46 tons, 2.3 %
 Machinery: 1,110 tons, 55.8 %
 Hull, fittings & equipment: 584 tons, 29.4 %
 Fuel, ammunition & stores: 249 tons, 12.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   408 lbs / 185 Kg = 7.9 x 4.7 " / 119 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.25
 Metacentric height 1.4 ft / 0.4 m
 Roll period: 11.7 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.66
 Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.457
 Length to Beam Ratio: 10.76 : 1
 'Natural speed' for length: 18.84 kts
 Power going to wave formation at top speed: 70 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 1.00 ft / 0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  25.00 ft / 7.62 m
    - Forecastle (20 %): 22.00 ft / 6.71 m
    - Mid (37 %):  22.00 ft / 6.71 m (14.00 ft / 4.27 m aft of break)
    - Quarterdeck (15 %): 14.00 ft / 4.27 m
    - Stern:  14.00 ft / 4.27 m
    - Average freeboard: 17.20 ft / 5.24 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 196.0 %
  - Above water (accommodation/working, high = better): 48.0 %
 Waterplane Area: 7,518 Square feet or 698 Square metres
 Displacement factor (Displacement / loading): 57 %
 Structure weight / hull surface area: 33 lbs/sq ft or 160 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.43
  - Longitudinal: 2.90
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is extremely poor