The 2001 version of the GB/PG/1914 design

In August 2001 (0r so), I recast the design for the GB/PG/1914 to be more typical of what might have been done at that date, rather than the radical concept from 1971, which was flush-decked. The new version had a raised forecastle, with twin funnels and guns on the centerline. One was on the forecastle, two on the centerline, where torpedo tubes might have gone, and one aft. The dimensions, as modified to improve the Springsharp report were 260ft x 27ft x 11ft. I had to increase the draft to improve strength and seakeeping ability. This is the Springsharp report:

GB/PG/1914, Great Britain Fast Gunboat laid down 1914 (Engine 1937)

Displacement:
 855 t light; 893 t standard; 1,010 t normal; 1,103 t full load

Dimensions: Length overall / water x beam x draught
 260.80 ft / 260.00 ft x 27.00 ft x 11.00 ft (normal load)
 79.49 m / 79.25 m x 8.23 m  x 3.35 m

Armament:
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1914 Model
   Quick firing guns in deck mounts with hoists
   on centreline, evenly spread
   Aft Main mounts separated by engine room
 Weight of broadside 128 lbs / 58 kg
 Shells per gun, main battery: 250

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 30,584 shp / 22,816 Kw = 32.00 kts
 Range 3,650nm at 15.00 kts
 Bunker at max displacement = 210 tons

Complement:
 89 - 116

Cost:
 £0.149 million / $0.598 million

Distribution of weights at normal displacement:
 Armament: 16 tons, 1.6 %
 Machinery: 529 tons, 52.4 %
 Hull, fittings & equipment: 310 tons, 30.7 %
 Fuel, ammunition & stores: 155 tons, 15.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   262 lbs / 119 Kg = 8.2 x 4.0 " / 102 mm shells or 0.2 torpedoes
 Stability (Unstable if below 1.00): 1.30
 Metacentric height 1.1 ft / 0.3 m
 Roll period: 10.7 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.49
 Seaboat quality  (Average = 1.00): 1.13

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.458
 Length to Beam Ratio: 9.63 : 1
 'Natural speed' for length: 16.12 kts
 Power going to wave formation at top speed: 74 %
 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:  23.00 ft / 7.01 m
    - Forecastle (20 %): 21.00 ft / 6.40 m
    - Mid (35 %):  21.00 ft / 6.40 m (13.00 ft / 3.96 m aft of break)
    - Quarterdeck (15 %): 13.00 ft / 3.96 m
    - Stern:  13.00 ft / 3.96 m
    - Average freeboard: 15.96 ft / 4.86 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 182.0 %
  - Above water (accommodation/working, high = better): 143.2 %
 Waterplane Area: 4,507 Square feet or 419 Square metres
 Displacement factor (Displacement / loading): 55 %
 Structure weight / hull surface area: 25 lbs/sq ft or 124 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.40
  - Longitudinal: 5.64
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent