My attempt at a Fisher-style Super Swift

By dispensing with armour, a Super Swift for 1912 is feasible. That is especially true if we settle for a 36-knot speed. The idea is to have a 2,480 ton ship with 6-4in QF guns and 4-21in TT. We use the lightest weight machinery allowed by Springsharp, which is not as light as we need. Remember that the Swift, a 1905/06 design could get as much as 60 SHP/ton of machinery, and that was running trials about 1907. This is the Springsharp report:

GB/CS/1912, Great Britain Scout Cruiser laid down 1912 (Engine 1950)

Displacement:
 2,147 t light; 2,222 t standard; 2,420 t normal; 2,578 t full load

Dimensions: Length overall / water x beam x draught
 371.36 ft / 370.00 ft x 38.00 ft x 14.00 ft (normal load)
 113.19 m / 112.78 m x 11.58 m  x 4.27 m

Armament:
      6 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1912 Model
   Quick firing guns in deck mounts with hoists
   on side ends, evenly spread
 Weight of broadside 192 lbs / 87 kg
 Shells per gun, main battery: 250
 4 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 69,991 shp / 52,214 Kw = 36.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 356 tons

Complement:
 172 - 224

Cost:
 £0.288 million / $1.152 million

Distribution of weights at normal displacement:
 Armament: 24 tons, 1.0 %
 Machinery: 1,376 tons, 56.9 %
 Hull, fittings & equipment: 747 tons, 30.9 %
 Fuel, ammunition & stores: 273 tons, 11.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   657 lbs / 298 Kg = 20.5 x 4.0 " / 102 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.46
 Metacentric height 2.2 ft / 0.7 m
 Roll period: 10.7 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.19
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.430
 Length to Beam Ratio: 9.74 : 1
 'Natural speed' for length: 19.24 kts
 Power going to wave formation at top speed: 71 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  26.00 ft / 7.92 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (36 %):  23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break)
    - Quarterdeck (15 %): 15.00 ft / 4.57 m
    - Stern:  15.00 ft / 4.57 m
    - Average freeboard: 18.12 ft / 5.52 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 191.5 %
  - Above water (accommodation/working, high = better): 133.4 %
 Waterplane Area: 8,831 Square feet or 820 Square metres
 Displacement factor (Displacement / loading): 68 %
 Structure weight / hull surface area: 39 lbs/sq ft or 191 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.50
  - Longitudinal: 2.94
  - Overall: 0.60
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent