The Design "X4" Fast Battleship from 2 December 1905

I thought that I would make another attempt at making the Design "X4" fast battleship specification work in Springsharp. John Roberts has the summary specification on page 26 of his Battlecruisers book. This is basically the Dreadnought, with the size increased so that 25 knots is possible. This is the Springsharp report:

Design X4  2 December 1905, Great Britain Fast Battleship laid down 1906 (Engine 1908)

Displacement:
 20,687 t light; 21,657 t standard; 24,200 t normal; 26,234 t full load

Dimensions: Length overall / water x beam x draught
 623.00 ft / 623.00 ft x 83.00 ft x 27.00 ft (normal load)
 189.89 m / 189.89 m x 25.30 m  x 8.23 m

Armament:
      4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1906 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      2 - 12.00" / 305 mm guns (1x2 guns), 864.00lbs / 391.90kg shells, 1906 Model
   Breech loading guns in a turret (on a barbette)
   on centreline amidships
      4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1906 Model
   Breech loading guns in turrets (on barbettes)
   on side, all amidships
      8 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1906 Model
   Quick firing guns in casemate mounts 
   on side, evenly spread, all raised mounts
      18 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1906 Model
   Breech loading guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 9,139 lbs / 4,145 kg
 Shells per gun, main battery: 90
 3 - 18.0" / 457.2 mm submerged torpedo tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 11.0" / 279 mm 385.00 ft / 117.35 m 8.00 ft / 2.44 m
 Ends: 4.00" / 102 mm 238.00 ft / 72.54 m 8.00 ft / 2.44 m
 Upper: 7.00" / 178 mm 385.00 ft / 117.35 m 8.00 ft / 2.44 m
   Main Belt covers 95 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 385.00 ft / 117.35 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 11.0" / 279 mm 8.00" / 203 mm  11.0" / 279 mm
 2nd: 11.0" / 279 mm 8.00" / 203 mm  11.0" / 279 mm
 3rd: 11.0" / 279 mm 8.00" / 203 mm  11.0" / 279 mm
 4th: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm
 5th: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 11.00" / 279 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 57,989 shp / 43,259 Kw = 25.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 4,577 tons (100% coal)

Complement:
 969 - 1,261

Cost:
 £2.135 million / $8.539 million

Distribution of weights at normal displacement:
 Armament: 1,142 tons, 4.7 %
 Armour: 7,360 tons, 30.4 %
    - Belts: 2,689 tons, 11.1 %
    - Torpedo bulkhead: 769 tons, 3.2 %
    - Armament: 2,296 tons, 9.5 %
    - Armour Deck: 1,408 tons, 5.8 %
    - Conning Tower: 198 tons, 0.8 %
 Machinery: 3,222 tons, 13.3 %
 Hull, fittings & equipment: 8,963 tons, 37.0 %
 Fuel, ammunition & stores: 3,513 tons, 14.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   28,928 lbs / 13,121 Kg = 33.5 x 12.0 " / 305 mm shells or 4.4 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 4.8 ft / 1.4 m
 Roll period: 16.0 seconds
 Steadiness - As gun platform (Average = 50 %): 60 %
   - Recoil effect (Restricted arc if above 1.00): 0.60
 Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.607
 Length to Beam Ratio: 7.51 : 1
 'Natural speed' for length: 24.96 kts
 Power going to wave formation at top speed: 49 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  27.00 ft / 8.23 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (37 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 19.20 ft / 5.85 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 106.2 %
  - Above water (accommodation/working, high = better): 135.3 %
 Waterplane Area: 38,055 Square feet or 3,535 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 165 lbs/sq ft or 804 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.30
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily