A 1906 British Battleship-Cruiser

So, why don't we give another try to a 1906 British Battleship-Cruiser. William Hovgaard's idea was to build these instead of battleships or armoured cruisers. The aging process would automatically create the slower battleline, as the newer ships got better. This design is probably handicapped by my insistence on a deep belt. That has required a greater displacement, in order to achieve adequate hull strength. I had wanted an 11in armour basis, but was not able to achieve that on this size ship. The idea is that this would have 8-12in guns in echelon, with 16-4in QF guns in casemates at the upper deck level and above. This is the Springsharp report:

GB/BB/1906 Battleship-Cruiser, Great Britain Battleship-Cruiser laid down 1906

Displacement:
 20,610 t light; 21,463 t standard; 23,800 t normal; 25,669 t full load

Dimensions: Length overall / water x beam x draught
 590.00 ft / 590.00 ft x 88.00 ft x 28.00 ft (normal load)
 179.83 m / 179.83 m x 26.82 m  x 8.53 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1906 Model
   Breech loading guns in turrets (on barbettes)
   on side ends, evenly spread
      16 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1906 Model
   Quick firing guns in casemate mounts 
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 7,424 lbs / 3,367 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.5" / 267 mm 390.00 ft / 118.87 m 17.00 ft / 5.18 m
 Ends: 4.00" / 102 mm 190.00 ft / 57.91 m 17.00 ft / 5.18 m
   10.00 ft / 3.05 m Unarmoured ends
   Main Belt covers 102 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - 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: 10.5" / 267 mm 7.00" / 178 mm  10.5" / 267 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 2.50" / 64 mm, Conning tower: 10.50" / 267 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 58,478 shp / 43,625 Kw = 25.00 kts
 Range 5,200nm at 15.00 kts
 Bunker at max displacement = 4,206 tons

Complement:
 957 - 1,245

Cost:
 £2.032 million / $8.130 million

Distribution of weights at normal displacement:
 Armament: 928 tons, 3.9 %
 Armour: 7,775 tons, 32.7 %
    - Belts: 3,492 tons, 14.7 %
    - Torpedo bulkhead: 563 tons, 2.4 %
    - Armament: 1,820 tons, 7.6 %
    - Armour Deck: 1,712 tons, 7.2 %
    - Conning Tower: 187 tons, 0.8 %
 Machinery: 3,797 tons, 16.0 %
 Hull, fittings & equipment: 8,110 tons, 34.1 %
 Fuel, ammunition & stores: 3,190 tons, 13.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   31,609 lbs / 14,338 Kg = 36.6 x 12.0 " / 305 mm shells or 4.6 torpedoes
 Stability (Unstable if below 1.00): 1.20
 Metacentric height 5.8 ft / 1.8 m
 Roll period: 15.3 seconds
 Steadiness - As gun platform (Average = 50 %): 67 %
   - Recoil effect (Restricted arc if above 1.00): 0.47
 Seaboat quality  (Average = 1.00): 1.35

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.573
 Length to Beam Ratio: 6.70 : 1
 'Natural speed' for length: 24.29 kts
 Power going to wave formation at top speed: 51 %
 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:  28.00 ft / 8.53 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (67 %):  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: 21.68 ft / 6.61 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 105.2 %
  - Above water (accommodation/working, high = better): 160.5 %
 Waterplane Area: 37,025 Square feet or 3,440 Square metres
 Displacement factor (Displacement / loading): 104 %
 Structure weight / hull surface area: 151 lbs/sq ft or 736 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.60
  - 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