The "extended" version of the GB/BB/1905 design

In 1973, I had played with the GB/BB/1905 design to see what sort of high speed might be attainable with lightweight machinery. In what I was able to achieve with Springsharp, the protection that my friend Cliff had specified actually weighed more than I had allowed in 1973, and less power was required than I had thought would be necessary. The result is rather a compromise, but one which is about what I had wanted. The ship is now a 30-knot ship with 13.4in armour. This is the Springsharp report:

GB/BB/1905 Extended, Great Britain Battleship laid down 1905 (Engine 1923)

Displacement:
 24,003 t light; 24,843 t standard; 26,500 t normal; 27,826 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, all amidships
 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

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.4" / 340 mm 10.0" / 254 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:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 119,317 shp / 89,010 Kw = 30.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 2,983 tons

Complement:
 1,038 - 1,350

Cost:
 £2.033 million / $8.134 million

Distribution of weights at normal displacement:
 Armament: 756 tons, 2.9 %
 Armour: 9,345 tons, 35.3 %
    - Belts: 3,402 tons, 12.8 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 2,331 tons, 8.8 %
    - Armour Deck: 3,483 tons, 13.1 %
    - Conning Tower: 129 tons, 0.5 %
 Machinery: 3,988 tons, 15.0 %
 Hull, fittings & equipment: 9,914 tons, 37.4 %
 Fuel, ammunition & stores: 2,497 tons, 9.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   41,756 lbs / 18,940 Kg = 48.3 x 12.0 " / 305 mm shells or 3.7 torpedoes
 Stability (Unstable if below 1.00): 1.08
 Metacentric height 4.8 ft / 1.5 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 63 %
   - Recoil effect (Restricted arc if above 1.00): 0.53
 Seaboat quality  (Average = 1.00): 1.26

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.555
 Length to Beam Ratio: 7.75 : 1
 'Natural speed' for length: 26.08 kts
 Power going to wave formation at top speed: 55 %
 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:  31.00 ft / 9.45 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (64 %):  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: 25.36 ft / 7.73 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 70.8 %
  - Above water (accommodation/working, high = better): 195.1 %
 Waterplane Area: 41,833 Square feet or 3,886 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 157 lbs/sq ft or 765 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.64
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily