The GB/PG/1915 design is very marginal

My friend Cliff's concept for the GB/PG/1915 is very difficult to realize in Springsharp. He wanted a flush-decked ship with 4-4in QF guns and a speed of 32 knots. The Standard displacement was 800 tons in Cliff's specification. He allowed for 250 tons of oil fuel. The reality was that in Springsharp, some compromises had to be made to achieve adequate strength and seakeeping. The freeboard had to be considerably raised and the displacement ballooned to 939 tons Standard. The fuel oil was 254 tons, so it is very close to the specified amount. This is the Springsharp report:

GB/PG/1915, Enter country Enter ship type laid down 1915 (Engine 1945)

Displacement:
 905 t light; 939 t standard; 1,080 t normal; 1,193 t full load

Dimensions: Length overall / water x beam x draught
 263.66 ft / 260.00 ft x 27.00 ft x 10.00 ft (normal load)
 80.36 m / 79.25 m x 8.23 m  x 3.05 m

Armament:
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1915 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, evenly spread
 Weight of broadside 128 lbs / 58 kg
 Shells per gun, main battery: 180

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 33,739 shp / 25,169 Kw = 32.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 254 tons

Complement:
 93 - 122

Cost:
 £0.180 million / $0.721 million

Distribution of weights at normal displacement:
 Armament: 16 tons, 1.5 %
 Machinery: 563 tons, 52.1 %
 Hull, fittings & equipment: 326 tons, 30.1 %
 Fuel, ammunition & stores: 175 tons, 16.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   303 lbs / 137 Kg = 9.5 x 4.0 " / 102 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.29
 Metacentric height 1.1 ft / 0.3 m
 Roll period: 10.8 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.51
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has raised forecastle, rise forward of midbreak, low quarterdeck 
 Block coefficient: 0.538
 Length to Beam Ratio: 9.63 : 1
 'Natural speed' for length: 16.12 kts
 Power going to wave formation at top speed: 76 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  19.00 ft / 5.79 m
    - Forecastle (20 %): 19.00 ft / 5.79 m (18.00 ft / 5.49 m aft of break)
    - Mid (50 %):  17.00 ft / 5.18 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 14.00 ft / 4.27 m (15.00 ft / 4.57 m before break)
    - Stern:  14.00 ft / 4.27 m
    - Average freeboard: 16.58 ft / 5.05 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 179.8 %
  - Above water (accommodation/working, high = better): 163.0 %
 Waterplane Area: 4,847 Square feet or 450 Square metres
 Displacement factor (Displacement / loading): 59 %
 Structure weight / hull surface area: 25 lbs/sq ft or 123 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.39
  - Longitudinal: 5.91
  - Overall: 0.51
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent