The J/DD/1918 design

The J/DD/1918 design doesn't seem to have a lot to commend it. The armament is unimproved over its predecessor, except that the light AA armament is now 8-57mm. The speed is now 34 knots, which was expensive, and the range is 3,750nm at 15 knots. For a 1918 ship, I was not willing to pay more in size to achieve a better design. This is the Springsharp report:

J/DD/1918, Japan Destroyer laid down 1918 (Engine 1927)

Displacement:
 1,416 t light; 1,449 t standard; 1,620 t normal; 1,757 t full load

Dimensions: Length overall / water x beam x draught
 327.26 ft / 325.00 ft x 32.00 ft x 13.00 ft (normal load)
 99.75 m / 99.06 m x 9.75 m  x 3.96 m

Armament:
      4 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1918 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, 1918 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, 1918 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, 2 raised mounts - superfiring
 Weight of broadside 266 lbs / 121 kg
 Shells per gun, main battery: 0
 6 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 45,088 shp / 33,636 Kw = 34.00 kts
 Range 3,750nm at 15.00 kts
 Bunker at max displacement = 308 tons

Complement:
 126 - 165

Cost:
 £0.411 million / $1.645 million

Distribution of weights at normal displacement:
 Armament: 33 tons, 2.1 %
 Machinery: 915 tons, 56.5 %
 Hull, fittings & equipment: 468 tons, 28.9 %
 Fuel, ammunition & stores: 204 tons, 12.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   351 lbs / 159 Kg = 6.8 x 4.7 " / 119 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.41
 Metacentric height 1.6 ft / 0.5 m
 Roll period: 10.5 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.46
 Seaboat quality  (Average = 1.00): 1.11

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.419
 Length to Beam Ratio: 10.16 : 1
 'Natural speed' for length: 18.03 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:  24.00 ft / 7.32 m
    - Forecastle (20 %): 21.00 ft / 6.40 m
    - Mid (37 %):  21.00 ft / 6.40 m (13.00 ft / 3.96 m aft of break)
    - Quarterdeck (15 %): 13.00 ft / 3.96 m
    - Stern:  13.00 ft / 3.96 m
    - Average freeboard: 16.20 ft / 4.94 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 196.4 %
  - Above water (accommodation/working, high = better): 89.1 %
 Waterplane Area: 6,481 Square feet or 602 Square metres
 Displacement factor (Displacement / loading): 52 %
 Structure weight / hull surface area: 31 lbs/sq ft or 150 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.42
  - Longitudinal: 3.05
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is cramped