The BBX "Mod. A" version

I had this concept about how to turn my friend Cliff's BBX design into a fast battleship, with a 28 knot speed. I realized when looking at the specification that the original version wanted 30 SHP/ton machinery, not the heavier machinery that I used. The BBX Mod.A had 40 SHP/ton machinery specified. Amazingly enough, my estimate of 180,000 SHP was pretty close to what Springsharp calculates. This is the revised Springsharp report:

GB/BB/1915 "BBX" Mod. A, Great Britain Battleship laid down 1915 (Engine 1937)

Displacement:
 69,118 t light; 72,755 t standard; 77,066 t normal; 80,514 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (807.44 ft / 800.00 ft) x 135.00 ft x (37.00 / 38.43 ft)
 (246.11 m / 243.84 m) x 41.15 m  x (11.28 / 11.71 m)

Armament:
      9 - 20.00" / 508 mm 45.0 cal guns - 4,370.00lbs / 1,982.20kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1915 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
      24 - 5.00" / 127 mm 45.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1915 Model
   12 x Twin mounts on sides, aft deck forward
      Weight of broadside 40,890 lbs / 18,547 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 18.0" / 457 mm 445.00 ft / 135.64 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 86 % of normal length

   - Torpedo Bulkhead:
  6.00" / 152 mm 445.00 ft / 135.64 m 37.00 ft / 11.28 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 18.0" / 457 mm 12.0" / 305 mm  18.0" / 457 mm
 2nd: 5.00" / 127 mm 3.00" / 76 mm  5.00" / 127 mm

   - Armoured deck - multiple decks: 8.00" / 203 mm For and Aft decks
 Forecastle: 7.00" / 178 mm  Quarter deck: 8.00" / 203 mm

   - Conning towers: Forward 18.00" / 457 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 180,161 shp / 134,400 Kw = 28.00 kts
 Range 10,000nm at 15.00 kts
 Bunker at max displacement = 7,759 tons

Complement:
 2,312 - 3,006

Cost:
 £9.664 million / $38.657 million

Distribution of weights at normal displacement:
 Armament: 5,675 tons, 7.4 %
 Armour: 29,670 tons, 38.5 %
    - Belts: 5,949 tons, 7.7 %
    - Torpedo bulkhead: 3,655 tons, 4.7 %
    - Armament: 6,930 tons, 9.0 %
    - Armour Deck: 12,433 tons, 16.1 %
    - Conning Tower: 702 tons, 0.9 %
 Machinery: 4,993 tons, 6.5 %
 Hull, fittings & equipment: 28,780 tons, 37.3 %
 Fuel, ammunition & stores: 7,948 tons, 10.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   123,397 lbs / 55,972 Kg = 30.8 x 20.0 " / 508 mm shells or 25.3 torpedoes
 Stability (Unstable if below 1.00): 1.23
 Metacentric height 11.4 ft / 3.5 m
 Roll period: 16.8 seconds
 Steadiness - As gun platform (Average = 50 %): 59 %
   - Recoil effect (Restricted arc if above 1.00): 0.63
 Seaboat quality  (Average = 1.00): 1.17

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.675 / 0.679
 Length to Beam Ratio: 5.93 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 12.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  35.00 ft / 10.67 m,  29.00 ft / 8.84 m
    - Forward deck: 30.00 %,  29.00 ft / 8.84 m,  25.00 ft / 7.62 m
    - Aft deck: 30.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Quarter deck: 15.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Average freeboard:  27.20 ft / 8.29 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 73.7 %
  - Above water (accommodation/working, high = better): 181.3 %
 Waterplane Area: 84,640 Square feet or 7,863 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 270 lbs/sq ft or 1,316 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.69
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent