The Ger/DD/1914 design

This is the original specification for the Ger/DD/1914, probably dating from 1971:

Ger/DD/1914

2-4in QF guns, 6-21in TT  20 mines
265ft x 27ft  900 tons
200 tons of oil fuel  18,000 SHP = 32 knots
Cost: £81,000

I tried very hard to come close to this specification. The resulting design has a very high freeboard for the size of the ship:

Ger/DD/1914, Germany Destroyer laid down 1914 (Engine 1950)

Displacement:
 861 t light; 895 t standard; 1,009 t normal; 1,100 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (272.10 ft / 265.00 ft) x 27.00 ft x (10.50 / 11.19 ft)
 (82.94 m / 80.77 m) x 8.23 m  x (3.20 / 3.41 m)

Armament:
      2 - 4.00" / 102 mm 50.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1914 Model
   2 x Single mounts on centreline ends, evenly spread
      Weight of broadside 64 lbs / 29 kg
      6 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.397 t each, 8.383 t total
 In 3 sets of deck mounted carriage/fixed tubes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 2.00" / 51 mm 1.00" / 25 mm  1.00" / 25 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 30,310 shp / 22,611 Kw = 32.00 kts
 Range 4,000nm at 15.00 kts
 Bunker at max displacement = 205 tons

Complement:
 89 - 116

Cost:
 £0.139 million / $0.557 million

Distribution of weights at normal displacement:
 Armament: 29 tons, 2.9 %
    - Guns: 21 tons, 2.1 %
    - Torpedoes: 8 tons, 0.8 %
 Armour: 14 tons, 1.4 %
    - Armament: 14 tons, 1.4 %
 Machinery: 514 tons, 50.9 %
 Hull, fittings & equipment: 284 tons, 28.2 %
 Fuel, ammunition & stores: 148 tons, 14.7 %
 Miscellaneous weights: 20 tons, 2.0 %
    - On freeboard deck: 20 tons

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   286 lbs / 130 Kg = 8.9 x 4.0 " / 102 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.22
 Metacentric height 1.0 ft / 0.3 m
 Roll period: 11.3 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.24
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has raised forecastle,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.470 / 0.481
 Length to Beam Ratio: 9.81 : 1
 'Natural speed' for length: 16.28 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: 5.00 ft / 1.52 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 23.00 %,  20.00 ft / 6.10 m,  19.00 ft / 5.79 m
    - Forward deck: 30.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Aft deck: 32.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Quarter deck: 15.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Average freeboard:  15.24 ft / 4.65 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 171.1 %
  - Above water (accommodation/working, high = better): 132.2 %
 Waterplane Area: 4,642 Square feet or 431 Square metres
 Displacement factor (Displacement / loading): 65 %
 Structure weight / hull surface area: 25 lbs/sq ft or 123 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.42
  - Longitudinal: 4.35
  - Overall: 0.53
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent