The coal-fired boiler version of the GB/BB/1905 design

My friend Cliff had conceived of the GB/BB/1905 design as an oil-fueled ship that sacrificed gunpower to achieve a good speed. I have been finding that having coal-fired boilers is more feasible than we had thought, back in 1971. The design has 6-12in/45 BLR and 8-6in QF guns. The latter are in twin turrets, as are the 12in guns. The speed is 24 knots and the armour basis is 13.4in. The deck is a very thick 4.5in. The machinery is 16 SHP/ton, which is not excessively light. This is the Springsharp report:

GB/BB/1905 Coal-fired boilers, Enter country Enter ship type laid down 1905 (Engine 1907)

Displacement:
 23,835 t light; 24,725 t standard; 29,000 t normal; 32,420 t full load

Dimensions: Length overall / water x beam x draught
 680.00 ft / 680.00 ft x 87.70 ft x 28.00 ft (normal load)
 207.26 m / 207.26 m x 26.73 m  x 8.53 m

Armament:
      6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1905 Model
   Quick firing guns in turrets (on barbettes)
   on side, evenly spread
 Weight of broadside 6,048 lbs / 2,743 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.4" / 340 mm 355.00 ft / 108.20 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 80 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 355.00 ft / 108.20 m 28.00 ft / 8.53 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.4" / 340 mm 9.00" / 229 mm  13.4" / 340 mm
 2nd: 3.38" / 86 mm 3.38" / 86 mm  3.38" / 86 mm

   - Armour deck: 4.50" / 114 mm, Conning tower: 6.75" / 171 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 53,836 shp / 40,162 Kw = 24.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 7,695 tons (100% coal)

Complement:
 1,110 - 1,444

Cost:
 £1.940 million / $7.761 million

Distribution of weights at normal displacement:
 Armament: 756 tons, 2.6 %
 Armour: 10,109 tons, 34.9 %
    - Belts: 3,411 tons, 11.8 %
    - Torpedo bulkhead: 736 tons, 2.5 %
    - Armament: 2,167 tons, 7.5 %
    - Armour Deck: 3,658 tons, 12.6 %
    - Conning Tower: 137 tons, 0.5 %
 Machinery: 3,365 tons, 11.6 %
 Hull, fittings & equipment: 9,606 tons, 33.1 %
 Fuel, ammunition & stores: 5,165 tons, 17.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   54,096 lbs / 24,538 Kg = 62.6 x 12.0 " / 305 mm shells or 8.6 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 5.5 ft / 1.7 m
 Roll period: 15.8 seconds
 Steadiness - As gun platform (Average = 50 %): 88 %
   - Recoil effect (Restricted arc if above 1.00): 0.54
 Seaboat quality  (Average = 1.00): 1.76

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.608
 Length to Beam Ratio: 7.75 : 1
 'Natural speed' for length: 26.08 kts
 Power going to wave formation at top speed: 44 %
 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:  30.00 ft / 9.14 m
    - Forecastle (20 %): 26.00 ft / 7.92 m
    - Mid (63 %):  26.00 ft / 7.92 m (18.00 ft / 5.49 m aft of break)
    - Quarterdeck (15 %): 18.00 ft / 5.49 m
    - Stern:  18.00 ft / 5.49 m
    - Average freeboard: 23.36 ft / 7.12 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 75.2 %
  - Above water (accommodation/working, high = better): 175.6 %
 Waterplane Area: 43,938 Square feet or 4,082 Square metres
 Displacement factor (Displacement / loading): 127 %
 Structure weight / hull surface area: 149 lbs/sq ft or 728 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.36
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather