My friend Cliff's GB/DD/1906 design

My friend Cliff designed the British destroyer he intended to mass produce. It had these oddities, in that the ship had 2-88mm QF guns (20pdr) and 2-21in TT, which were anacronistic. The main benefit of the 88mm was that it had a high rate of fire and the shell was easy to manhandle. The designed speed was 32 knots. In Springsharp, the design came out with a very low displacement, in order to obtain adequate seakeeping ability. The machinery was 55.7 SHP/ton of machinery.

GB/DD/1906, Great Britain Destroyer laid down 1906 (Engine 1916)

Displacement:
 683 t light; 702 t standard; 754 t normal; 796 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
   Quick firing 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: 150
 2 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 23,346 shp / 17,416 Kw = 32.00 kts
 Range 3,600nm at 10.00 kts
 Bunker at max displacement = 95 tons

Complement:
 71 - 93

Cost:
 £0.087 million / $0.348 million

Distribution of weights at normal displacement:
 Armament: 5 tons, 0.7 %
 Machinery: 419 tons, 55.6 %
 Hull, fittings & equipment: 259 tons, 34.3 %
 Fuel, ammunition & stores: 71 tons, 9.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   214 lbs / 97 Kg = 10.3 x 3.5 " / 88 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.38
 Metacentric height 1.2 ft / 0.4 m
 Roll period: 10.2 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.15
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.369
 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 (27 %): 18.00 ft / 5.49 m
    - Mid (27 %):  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: 13.00 ft / 3.96 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 184.7 %
  - Above water (accommodation/working, high = better): 103.6 %
 Waterplane Area: 4,348 Square feet or 404 Square metres
 Displacement factor (Displacement / loading): 42 %
 Structure weight / hull surface area: 27 lbs/sq ft or 132 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.48
  - Longitudinal: 3.30
  - Overall: 0.59
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate