An "extreme version" of the GB/CB/1905 battlecruiser

My intent in about 1972 was to have a very high speed version of the GB/CB/1905 design. I just ran such a version through Springsharp. It was made possible by having a lightweight machinery plant. If you require a lower output machinery plant, then you are lucky to reach 33 knots, the originally planned speed. This Springsharp report is very good, if you accept the machinery weight. This is a really dominant, fast cruiser that sacrifices protection and gunpower for extreme speed and good seakeeping characteristics:

GB/CB/1905 Extreme version, Enter country Enter ship type laid down 1905 (Engine 1921)

Displacement:
 23,260 t light; 23,987 t standard; 26,500 t normal; 28,510 t full load

Dimensions: Length overall / water x beam x draught
 770.00 ft / 770.00 ft x 80.00 ft x 28.00 ft (normal load)
 234.70 m / 234.70 m x 24.38 m  x 8.53 m

Armament:
      4 - 12.00" / 305 mm guns (2x2 guns), 850.00lbs / 385.55kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      9 - 6.00" / 152 mm guns in single mounts, 100.00lbs / 45.36kg shells, 1905 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 4,300 lbs / 1,950 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 660.00 ft / 201.17 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 4.00" / 102 mm 400.00 ft / 121.92 m 8.00 ft / 2.44 m
   Main Belt covers 132 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.50" / 38 mm 660.00 ft / 201.17 m 26.00 ft / 7.92 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 227,821 shp / 169,954 Kw = 36.00 kts
 Range 6,500nm at 18.00 kts
 Bunker at max displacement = 4,523 tons

Complement:
 1,038 - 1,350

Cost:
 £2.377 million / $9.509 million

Distribution of weights at normal displacement:
 Armament: 554 tons, 2.1 %
 Armour: 4,792 tons, 18.1 %
    - Belts: 1,508 tons, 5.7 %
    - Torpedo bulkhead: 952 tons, 3.6 %
    - Armament: 644 tons, 2.4 %
    - Armour Deck: 1,572 tons, 5.9 %
    - Conning Tower: 115 tons, 0.4 %
 Machinery: 7,845 tons, 29.6 %
 Hull, fittings & equipment: 10,069 tons, 38.0 %
 Fuel, ammunition & stores: 3,240 tons, 12.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   27,712 lbs / 12,570 Kg = 32.1 x 12.0 " / 305 mm shells or 3.1 torpedoes
 Stability (Unstable if below 1.00): 1.24
 Metacentric height 5.3 ft / 1.6 m
 Roll period: 14.6 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.47
 Seaboat quality  (Average = 1.00): 1.30

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.538
 Length to Beam Ratio: 9.63 : 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): -1.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  34.00 ft / 10.36 m
    - Forecastle (20 %): 31.00 ft / 9.45 m
    - Mid (73 %):  31.00 ft / 9.45 m (23.00 ft / 7.01 m aft of break)
    - Quarterdeck (15 %): 23.00 ft / 7.01 m
    - Stern:  23.00 ft / 7.01 m
    - Average freeboard: 29.08 ft / 8.86 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 148.8 %
  - Above water (accommodation/working, high = better): 230.2 %
 Waterplane Area: 42,500 Square feet or 3,948 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 140 lbs/sq ft or 684 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.71
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily