The J/DD/1937 design

The J/DD/1937 design is a more substantial ship than her predecessors. The normal displacement is now 2,300 tons. The range is extended to 6,000nm at 15 knots. The maximum speed and main armament are unchanged. 35 knots is about all that is feasible with Springsharp in its present state where it overstates the power needed for smaller ships. This is the Springsharp report:

J/DD/1937, Japan Destroyer laid down 1937 (Engine 1945)

Displacement:
 1,939 t light; 2,019 t standard; 2,300 t normal; 2,525 t full load

Dimensions: Length overall / water x beam x draught
 372.36 ft / 370.00 ft x 35.00 ft x 13.00 ft (normal load)
 113.50 m / 112.78 m x 10.67 m  x 3.96 m

Armament:
      6 - 5.00" / 127 mm guns (3x2 guns), 62.50lbs / 28.35kg shells, 1937 Model
   Dual purpose guns in deck mounts with hoists
   on centreline, evenly spread
   Aft Main mounts separated by engine room
      16 - 2.24" / 57.0 mm guns (8x2 guns), 5.65lbs / 2.56kg shells, 1937 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 465 lbs / 211 kg
 Shells per gun, main battery: 120
 10 - 24.0" / 609.6 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 60,930 shp / 45,454 Kw = 35.00 kts
 Range 6,000nm at 15.00 kts
 Bunker at max displacement = 506 tons

Complement:
 165 - 215

Cost:
 £1.567 million / $6.269 million

Distribution of weights at normal displacement:
 Armament: 58 tons, 2.5 %
 Machinery: 1,219 tons, 53.0 %
 Hull, fittings & equipment: 663 tons, 28.8 %
 Fuel, ammunition & stores: 361 tons, 15.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   515 lbs / 234 Kg = 8.2 x 5.0 " / 127 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.29
 Metacentric height 1.6 ft / 0.5 m
 Roll period: 11.5 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.64
 Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
 Hull has rise forward of midbreak, raised quarterdeck 
 Block coefficient: 0.478
 Length to Beam Ratio: 10.57 : 1
 'Natural speed' for length: 19.24 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:  26.00 ft / 7.92 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (37 %):  23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break)
    - Quarterdeck (15 %): 15.00 ft / 4.57 m (14.00 ft / 4.27 m before break)
    - Stern:  15.00 ft / 4.57 m
    - Average freeboard: 17.96 ft / 5.47 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 190.0 %
  - Above water (accommodation/working, high = better): 49.8 %
 Waterplane Area: 8,461 Square feet or 786 Square metres
 Displacement factor (Displacement / loading): 65 %
 Structure weight / hull surface area: 34 lbs/sq ft or 167 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.43
  - Longitudinal: 2.72
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is extremely poor