The GB/CB/1905 fast version from the Red Book

This is the fast version of the GB/CB/1905 design that goes with the photograph that I recently posted. They both derive from a drawing and specification that dates from the early 1970's. At the time, I had hoped that 218,000 SHP would provide a very high speed that is beyond what is possible. Aside from that, what could be achieved in Springsharp for a 25,000 ton Standard displacement and 218,000 SHP with moderately light machinery is everything and more that my friend Cliff had hoped for the design. This is the Springsharp report:

GB/CB/1905 Fast, Great Britain Battlecruiser laid down 1905 (Engine 1919)

Displacement:
 24,306 t light; 25,092 t standard; 27,850 t normal; 30,056 t full load

Dimensions: Length overall / water x beam x draught
 770.00 ft / 770.00 ft x 85.00 ft x 28.00 ft (normal load)
 234.70 m / 234.70 m x 25.91 m  x 8.53 m

Armament:
      4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
   Quick firing guns in deck mounts with hoists
   on side, evenly spread
      1 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
   Breech loading gun in a deck mount with hoist
   on centreline aft, 1 raised gun
 Weight of broadside 4,428 lbs / 2,009 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 465.00 ft / 141.73 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 4.00" / 102 mm 290.00 ft / 88.39 m 8.00 ft / 2.44 m
   Main Belt covers 93 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 465.00 ft / 141.73 m 28.00 ft / 8.53 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 5.00" / 127 mm  8.00" / 203 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm
 3rd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 223,451 shp / 166,694 Kw = 35.50 kts
 Range 8,700nm at 16.00 kts
 Bunker at max displacement = 4,964 tons

Complement:
 1,077 - 1,401

Cost:
 £2.427 million / $9.706 million

Distribution of weights at normal displacement:
 Armament: 554 tons, 2.0 %
 Armour: 5,620 tons, 20.2 %
    - Belts: 1,147 tons, 4.1 %
    - Torpedo bulkhead: 963 tons, 3.5 %
    - Armament: 898 tons, 3.2 %
    - Armour Deck: 2,493 tons, 8.9 %
    - Conning Tower: 119 tons, 0.4 %
 Machinery: 7,935 tons, 28.5 %
 Hull, fittings & equipment: 10,197 tons, 36.6 %
 Fuel, ammunition & stores: 3,544 tons, 12.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   30,583 lbs / 13,872 Kg = 35.4 x 12.0 " / 305 mm shells or 3.5 torpedoes
 Stability (Unstable if below 1.00): 1.30
 Metacentric height 6.3 ft / 1.9 m
 Roll period: 14.2 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.32
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.532
 Length to Beam Ratio: 9.06 : 1
 'Natural speed' for length: 27.75 kts
 Power going to wave formation at top speed: 58 %
 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:  33.00 ft / 10.06 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (73 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 26.24 ft / 8.00 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 140.5 %
  - Above water (accommodation/working, high = better): 210.7 %
 Waterplane Area: 44,910 Square feet or 4,172 Square metres
 Displacement factor (Displacement / loading): 107 %
 Structure weight / hull surface area: 146 lbs/sq ft or 711 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.34
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent