My friend Cliff's British Destroyer design: GB/DD/1906

I had to make a few adjustments, but my friend Cliff's design for a British destroyer worked fairly well in Springsharp. The main issue, as always, was achieving acceptable seakeeping ability. I increased the draft and decreased the block coefficient until the seakeeping was over 1.0. The odd features of the design are the 88mm (20pdr QF) guns and the 21in TT. Cliff thought that is the 88mm was good for landwarfare, it should be as good at sea, even for the British:

GB/DD/1906, Great Britain Destroyer laid down 1906 (Engine 1927)

Displacement:
 715 t light; 736 t standard; 779 t normal; 813 t full load

Dimensions: Length overall / water x beam x draught
 265.66 ft / 265.00 ft x 27.00 ft x 10.00 ft (normal load)
 80.97 m / 80.77 m x 8.23 m  x 3.05 m

Armament:
      2 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1906 Model
   Breech loading guns in deck mounts with hoists
   on centreline ends, evenly spread, all raised mounts
 Weight of broadside 42 lbs / 19 kg
 Shells per gun, main battery: 250
 2 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 24,051 shp / 17,942 Kw = 32.00 kts
 Range 3,500nm at 10.00 kts
 Bunker at max displacement = 77 tons

Complement:
 73 - 95

Cost:
 £0.089 million / $0.354 million

Distribution of weights at normal displacement:
 Armament: 5 tons, 0.7 %
 Machinery: 422 tons, 54.2 %
 Hull, fittings & equipment: 287 tons, 36.9 %
 Fuel, ammunition & stores: 64 tons, 8.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   244 lbs / 110 Kg = 11.7 x 3.5 " / 88 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.32
 Metacentric height 1.2 ft / 0.4 m
 Roll period: 10.6 seconds
 Steadiness - As gun platform (Average = 50 %): 50 %
   - Recoil effect (Restricted arc if above 1.00): 0.16
 Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.381
 Length to Beam Ratio: 9.81 : 1
 'Natural speed' for length: 16.28 kts
 Power going to wave formation at top speed: 70 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  19.00 ft / 5.79 m
    - Forecastle (30 %): 18.00 ft / 5.49 m
    - Mid (30 %):  18.00 ft / 5.49 m (11.00 ft / 3.35 m aft of break)
    - Quarterdeck (15 %): 11.00 ft / 3.35 m
    - Stern:  11.00 ft / 3.35 m
    - Average freeboard: 13.22 ft / 4.03 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 180.5 %
  - Above water (accommodation/working, high = better): 101.1 %
 Waterplane Area: 4,364 Square feet or 405 Square metres
 Displacement factor (Displacement / loading): 50 %
 Structure weight / hull surface area: 29 lbs/sq ft or 144 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.53
  - Longitudinal: 3.72
  - Overall: 0.64
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate