An extreme sports GB/CB/1905 battlecruiser

Since I can run Springsharp 3.0b1 Beta here at lunch, I thought that I would see just how much speed I could achieve, through really radical measures. The answer is 38.5 knots is what is achievable, doing what I just did. The design is very extreme, as I use very lightweight machinery. To optimize power and strength, I lowered the displacement considerably, so that there is no excess weight going into the hull. As you may recall, this is the best photo:

We could probably achieve some monster speed by allowing for more than four shafts and raising total power about 300,000 SHP. In any case, to not have an error, Springsharp required me to use geared turbines, which is not very likely in real life. Of course, the whole idea of a ship like this would never have been accepted. This is the Springsharp report:

GB/CB/1905 extreme, Great Britain Battlecruiser laid down 1905 (Engine 1941)

Displacement:
 22,731 t light; 23,472 t standard; 24,838 t normal; 25,931 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (778.00 ft / 770.00 ft) x 85.00 ft x (27.50 / 28.39 ft)
 (237.13 m / 234.70 m) x 25.91 m  x (8.38 / 8.65 m)

Armament:
      4 - 12.00" / 305 mm 45.0 cal guns - 850.00lbs / 385.55kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts , 1905 Model
   2 x Twin mounts on centreline ends, evenly spread
      9 - 6.00" / 152 mm 50.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts , 1905 Model
   8 x Single mounts on sides, evenly spread
   1 x Single mount on centreline, aft evenly spread
 Weight of broadside 4,300 lbs / 4,300 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 420.00 ft / 128.02 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 84 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.50" / 38 mm 420.00 ft / 128.02 m 27.50 ft / 8.38 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 283,267 shp / 211,317 Kw = 38.50 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 2,458 tons

Complement:
 989 - 1,286

Cost:
 £2.277 million / $9.108 million

Distribution of weights at normal displacement:
 Armament: 923 tons, 3.7 %
 Armour: 4,252 tons, 17.1 %
    - Belts: 1,163 tons, 4.7 %
    - Torpedo bulkhead: 641 tons, 2.6 %
    - Armament: 750 tons, 3.0 %
    - Armour Deck: 1,589 tons, 6.4 %
    - Conning Tower: 110 tons, 0.4 %
 Machinery: 7,486 tons, 30.1 %
 Hull, fittings & equipment: 10,477 tons, 42.2 %
 Fuel, ammunition & stores: 2,108 tons, 8.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   26,479 lbs / 12,011 Kg = 30.6 x 12.0 " / 305 mm shells or 3.0 torpedoes
 Stability (Unstable if below 1.00): 1.20
 Metacentric height 5.5 ft / 1.7 m
 Roll period: 15.3 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.40
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.483 / 0.488
 Length to Beam Ratio: 9.06 : 1
 'Natural speed' for length: 27.75 kts
 Power going to wave formation at top speed: 60 %
 Trim (Max stability = 0, Max steadiness = 100): 53
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  34.00 ft / 10.36 m,  32.00 ft / 9.75 m
    - Forward deck: 30.00 %,  32.00 ft / 9.75 m,  30.00 ft / 9.14 m
    - Aft deck: 20.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Quarter deck: 30.00 %,  22.00 ft / 6.71 m,  23.00 ft / 7.01 m
    - Average freeboard:  28.61 ft / 8.72 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 148.4 %
  - Above water (accommodation/working, high = better): 253.1 %
 Waterplane Area: 42,946 Square feet or 3,990 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 151 lbs/sq ft or 739 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.67
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent