The Ger/DD/1915 design

The Ger/DD/1915 is one of the last designs in the "Blue Book" from the early 1970's. This is the original specification:

Ger/DD/1915 

800 tons   20,000 SHP at 45 SHP/ton

240ft x 26ft  Depth = 20ft
Cp = 0.58   Cm = 0.80

Weights:
Armament       20 tons
Machinery     444 tons
Hull          272 tons
Miscellaneous  64 tons
Oil fuel      200 tons
Feedwater      50 tons    Full load 1050 tons

2-4in guns (1.7 ton) and 4-21in TT   20 mines on deck

This is the Springsharp report for what I was actually able to implement:

Ger/DD/1915, Germany Destroyer laid down 1915 (Engine 1950)

Displacement:
 762 t light; 790 t standard; 880 t normal; 952 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (248.31 ft / 240.00 ft) x 26.00 ft x (12.50 / 13.16 ft)
 (75.69 m / 73.15 m) x 7.92 m  x (3.81 / 4.01 m)

Armament:
      2 - 4.00" / 102 mm 45.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1915 Model
   2 x Single mounts on centreline ends, evenly spread
      Weight of broadside 64 lbs / 29 kg
      4 - 21.0" / 533 mm, 21.00 ft / 6.40 m torpedoes - 1.342 t each, 5.368 t total
 In 2 sets of deck mounted centre rotating tubes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 3.00" / 76 mm 2.00" / 51 mm  3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 28,525 shp / 21,279 Kw = 32.00 kts
 Range 4,000nm at 14.00 kts
 Bunker at max displacement = 162 tons

Complement:
 80 - 105

Cost:
 £0.139 million / $0.556 million

Distribution of weights at normal displacement:
 Armament: 23 tons, 2.6 %
    - Guns: 18 tons, 2.0 %
    - Torpedoes: 5 tons, 0.6 %
 Armour: 26 tons, 3.0 %
    - Armament: 26 tons, 3.0 %
 Machinery: 447 tons, 50.8 %
 Hull, fittings & equipment: 245 tons, 27.9 %
 Fuel, ammunition & stores: 118 tons, 13.4 %
 Miscellaneous weights: 20 tons, 2.3 %
    - On freeboard deck: 20 tons

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   216 lbs / 98 Kg = 6.8 x 4.0 " / 102 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 0.9 ft / 0.3 m
 Roll period: 11.8 seconds
 Steadiness - As gun platform (Average = 50 %): 50 %
   - Recoil effect (Restricted arc if above 1.00): 0.27
 Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
 Hull has raised forecastle,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.395 / 0.406
 Length to Beam Ratio: 9.23 : 1
 'Natural speed' for length: 15.49 kts
 Power going to wave formation at top speed: 74 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 6.00 degrees
 Stern overhang: 6.00 ft / 1.83 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  22.00 ft / 6.71 m,  21.00 ft / 6.40 m
    - Forward deck: 30.00 %,  13.00 ft / 3.96 m,  13.00 ft / 3.96 m
    - Aft deck: 35.00 %,  13.00 ft / 3.96 m,  13.00 ft / 3.96 m
    - Quarter deck: 15.00 %,  13.00 ft / 3.96 m,  13.00 ft / 3.96 m
    - Average freeboard:  14.68 ft / 4.47 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 170.6 %
  - Above water (accommodation/working, high = better): 84.1 %
 Waterplane Area: 3,828 Square feet or 356 Square metres
 Displacement factor (Displacement / loading): 60 %
 Structure weight / hull surface area: 25 lbs/sq ft or 120 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.39
  - Longitudinal: 5.29
  - Overall: 0.51
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is cramped