The Ger/DD/1911 destroyer design: circa September 2001

I have a pencil drawing of a very German-looking version of the Ger/DD/1911 destroyer design. This is a compact destroyer with a very short forecastle and a well deck with a torpedo tube on each side. The dimensions are veryb modest: 240ft x 26ft x 10ft. The speed is my standard 32 knots and the armament is 2-4in QF guns and 4-21in TT. This is the Springsharp report:

Ger/DD/1911, Germany Destroyer laid down 1911 (Engine 1937)

Displacement:
 686 t light; 708 t standard; 800 t normal; 873 t full load

Dimensions: Length overall / water x beam x draught
 242.80 ft / 240.00 ft x 26.00 ft x 10.00 ft (normal load)
 74.01 m / 73.15 m x 7.92 m  x 3.05 m

Armament:
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1911 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread
 Weight of broadside 64 lbs / 29 kg
 Shells per gun, main battery: 180
 4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 27,849 shp / 20,775 Kw = 32.00 kts
 Range 3,250nm at 15.00 kts
 Bunker at max displacement = 165 tons

Complement:
 74 - 97

Cost:
 £0.091 million / $0.363 million

Distribution of weights at normal displacement:
 Armament: 8 tons, 1.0 %
 Machinery: 429 tons, 53.7 %
 Hull, fittings & equipment: 249 tons, 31.1 %
 Fuel, ammunition & stores: 114 tons, 14.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   207 lbs / 94 Kg = 6.5 x 4.0 " / 102 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.29
 Metacentric height 1.0 ft / 0.3 m
 Roll period: 10.7 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.26
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has raised forecastle, rise forward of midbreak
 Block coefficient: 0.449
 Length to Beam Ratio: 9.23 : 1
 'Natural speed' for length: 15.49 kts
 Power going to wave formation at top speed: 76 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  23.00 ft / 7.01 m
    - Forecastle (20 %): 22.00 ft / 6.71 m (21.00 ft / 6.40 m aft of break)
    - Mid (15 %):  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: 15.31 ft / 4.66 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 181.1 %
  - Above water (accommodation/working, high = better): 76.7 %
 Waterplane Area: 3,976 Square feet or 369 Square metres
 Displacement factor (Displacement / loading): 50 %
 Structure weight / hull surface area: 23 lbs/sq ft or 114 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.39
  - Longitudinal: 6.07
  - Overall: 0.51
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is cramped

Mid break must be 0% or aft of forecastle & forward of quarter deck