HMS Swift in Springsharp

The main problem with the existing Springsharp program is that SHP/ton is too low for destroyers, regardless of where you set the date. That may not be universally a problem, but for HMS Swift, it certainly is an issue. The real ship, launched in 1907, could generate 50,000 SHP from machinery weighing about 781 tons (boilers weighed 420 tons and engines weighed 361 tons). With the machinery year set to 1950, all I could get was 53.08 SHP/ton. The real ship could generate about 64 SHP/ton when pressed. I don't have the guns specified right, but I don't think it affects the outcome by much. By reducing the displacement to 1,853 tons normal, the design "worked" in Springsharp:

Swift, Great Britain Destroyer Leader laid down 1906 (Engine 1950)

Displacement:
 1,668 t light; 1,722 t standard; 1,853 t normal; 1,957 t full load

Dimensions: Length overall / water x beam x draught
 345.40 ft / 345.00 ft x 34.10 ft x 12.50 ft (normal load)
 105.28 m / 105.16 m x 10.39 m  x 3.81 m

Armament:
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1906 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread, all raised mounts - superfiring
 Weight of broadside 128 lbs / 58 kg
 Shells per gun, main battery: 250
 2 - 18.0" / 457.2 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 54,519 shp / 40,671 Kw = 35.00 kts
 Range 3,200nm at 15.00 kts
 Bunker at max displacement = 235 tons

Complement:
 140 - 183

Cost:
 £0.215 million / $0.859 million

Distribution of weights at normal displacement:
 Armament: 16 tons, 0.9 %
 Machinery: 1,020 tons, 55.1 %
 Hull, fittings & equipment: 631 tons, 34.1 %
 Fuel, ammunition & stores: 185 tons, 10.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   535 lbs / 243 Kg = 16.7 x 4.0 " / 102 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.35
 Metacentric height 1.7 ft / 0.5 m
 Roll period: 11.0 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.22
 Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.441
 Length to Beam Ratio: 10.12 : 1
 'Natural speed' for length: 18.57 kts
 Power going to wave formation at top speed: 71 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 1.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  23.00 ft / 7.01 m
    - Forecastle (34 %): 22.00 ft / 6.71 m
    - Mid (34 %):  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: 16.86 ft / 5.14 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 184.8 %
  - Above water (accommodation/working, high = better): 129.7 %
 Waterplane Area: 7,450 Square feet or 692 Square metres
 Displacement factor (Displacement / loading): 68 %
 Structure weight / hull surface area: 38 lbs/sq ft or 185 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.54
  - Longitudinal: 3.25
  - Overall: 0.65
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent