The GB/CA/1905 design with coal-fired boilers

By concept for a 1905 British armoured cruiser that uses coal-fired boilers has 12-9.2in guns arranged in the lozenge pattern. There is one turret at each end, and two turrets on each beam. The secondary armament consists of 12-4in QF guns in casemates on the upper deck, with four elevated one level above that. The speed is aggressive for the time, with 26 knots. The armour basis is 6in with a 2in deck. The turret faces and barbettes are 7in. The machinery, while lightweight, is just 22.4 SHP/ton. This is the Springsharp report:

GB/CA/1905, Great Britain Armoured Cruiser laid down 1905 (Engine 1911)

Displacement:
 15,642 t light; 16,561 t standard; 18,800 t normal; 20,591 t full load

Dimensions: Length overall / water x beam x draught
 560.00 ft / 560.00 ft x 78.00 ft x 25.50 ft (normal load)
 170.69 m / 170.69 m x 23.77 m  x 7.77 m

Armament:
      4 - 9.20" / 234 mm guns (2x2 guns), 389.34lbs / 176.60kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      8 - 9.20" / 234 mm guns (4x2 guns), 389.34lbs / 176.60kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on side, all amidships
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
   Quick firing guns in casemate mounts 
   on side, evenly spread, 4 raised mounts
 Weight of broadside 5,968 lbs / 2,707 kg
 Shells per gun, main battery: 150

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 250.00 ft / 76.20 m 16.00 ft / 4.88 m
   Main Belt covers 107 % of normal length

   - Torpedo Bulkhead:
  1.50" / 38 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: 7.00" / 178 mm 5.00" / 127 mm  7.00" / 178 mm
 3rd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 7.00" / 178 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 60,178 shp / 44,893 Kw = 26.00 kts
 Range 5,400nm at 15.00 kts
 Bunker at max displacement = 4,030 tons (100% coal)

Complement:
 802 - 1,043

Cost:
 £1.550 million / $6.201 million

Distribution of weights at normal displacement:
 Armament: 746 tons, 4.0 %
 Armour: 5,517 tons, 29.3 %
    - Belts: 2,186 tons, 11.6 %
    - Torpedo bulkhead: 563 tons, 3.0 %
    - Armament: 1,490 tons, 7.9 %
    - Armour Deck: 1,172 tons, 6.2 %
    - Conning Tower: 107 tons, 0.6 %
 Machinery: 2,687 tons, 14.3 %
 Hull, fittings & equipment: 6,692 tons, 35.6 %
 Fuel, ammunition & stores: 3,158 tons, 16.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   27,569 lbs / 12,505 Kg = 70.8 x 9.2 " / 234 mm shells or 4.1 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 4.7 ft / 1.4 m
 Roll period: 15.1 seconds
 Steadiness - As gun platform (Average = 50 %): 62 %
   - Recoil effect (Restricted arc if above 1.00): 0.58
 Seaboat quality  (Average = 1.00): 1.24

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.591
 Length to Beam Ratio: 7.18 : 1
 'Natural speed' for length: 23.66 kts
 Power going to wave formation at top speed: 54 %
 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:  26.00 ft / 7.92 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (67 %):  25.00 ft / 7.62 m (17.00 ft / 5.18 m aft of break)
    - Quarterdeck (15 %): 17.00 ft / 5.18 m
    - Stern:  17.00 ft / 5.18 m
    - Average freeboard: 22.44 ft / 6.84 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 104.7 %
  - Above water (accommodation/working, high = better): 171.4 %
 Waterplane Area: 31,672 Square feet or 2,942 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 140 lbs/sq ft or 685 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.69
  - 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