The anachronistic Indefatigable with oil-fired boilers

The anachronistic Indefatigable makes a much better ship with oil-fired boilers. This version can make a top speed of 27 knots. The ship is otherwise the same. This is the Springsharp 3.0b1 Beta report:

Indefatigable class, anachronistic, Great Britain Battlecruiser laid down 1911 (Engine 1914)

Displacement:
 16,713 t light; 17,475 t standard; 18,958 t normal; 20,144 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (585.75 ft / 580.00 ft) x 80.00 ft x (26.00 / 27.28 ft)
 (178.54 m / 176.78 m) x 24.38 m  x (7.92 / 8.32 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 850.00lbs / 385.55kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts , 1911 Model
   1 x Twin mount on centreline, forward evenly spread
  1 raised mount
   2 x Triple mounts on centreline ends, majority forward
      16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts , 1911 Model
   8 x Twin mounts on sides, forward deck aft
  8 raised mounts
 Weight of broadside 7,316 lbs / 7,316 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 390.00 ft / 118.87 m 16.00 ft / 4.88 m
 Ends: 4.00" / 102 mm 190.00 ft / 57.91 m 16.00 ft / 4.88 m
   Main Belt covers 103 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 390.00 ft / 118.87 m 26.00 ft / 7.92 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 7.00" / 178 mm 5.00" / 127 mm  7.00" / 178 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Armour deck: 2.00" / 51 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 68,109 shp / 50,809 Kw = 27.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 2,668 tons

Complement:
 807 - 1,050

Cost:
 £1.653 million / $6.612 million

Distribution of weights at normal displacement:
 Armament: 1,353 tons, 7.1 %
 Armour: 5,293 tons, 27.9 %
    - Belts: 2,050 tons, 10.8 %
    - Torpedo bulkhead: 750 tons, 4.0 %
    - Armament: 1,295 tons, 6.8 %
    - Armour Deck: 1,198 tons, 6.3 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 2,624 tons, 13.8 %
 Hull, fittings & equipment: 7,962 tons, 42.0 %
 Fuel, ammunition & stores: 2,245 tons, 11.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   29,281 lbs / 13,282 Kg = 33.9 x 12.0 " / 305 mm shells or 4.4 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 4.9 ft / 1.5 m
 Roll period: 15.2 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.82
 Seaboat quality  (Average = 1.00): 1.40

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.550 / 0.557
 Length to Beam Ratio: 7.25 : 1
 'Natural speed' for length: 24.08 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 40
 Bow angle (Positive = bow angles forward): 9.00 degrees
 Stern overhang: 1.00 ft / 0.30 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  30.00 ft / 9.14 m,  26.00 ft / 7.92 m
    - Forward deck: 30.00 %,  26.00 ft / 7.92 m,  25.00 ft / 7.62 m
    - Aft deck: 35.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Quarter deck: 15.00 %,  25.00 ft / 7.62 m,  26.00 ft / 7.92 m
    - Average freeboard:  25.75 ft / 7.85 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 104.5 %
  - Above water (accommodation/working, high = better): 192.8 %
 Waterplane Area: 32,382 Square feet or 3,008 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 157 lbs/sq ft or 768 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.91
  - Longitudinal: 2.22
  - 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