A 37 knot British light cruiser

I thought that the next step would be to create a British light cruiser that was like the Japanese Mogami class ships. Obviously, such a ship must be larger than 10,000 tons standard. The amazing thing is the displacement is not that extreme, due to the use of very lightweight machinery. This is the Springsharp report for the GB/CL/1932:

GB/CL/1932, Great Britain Light Cruiser laid down 1932 (Engine 1950)

Displacement:
 12,524 t light; 12,989 t standard; 14,045 t normal; 14,889 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (669.64 ft / 665.00 ft) x 64.00 ft x (21.00 / 21.96 ft)
 (204.11 m / 202.69 m) x 19.51 m  x (6.40 / 6.69 m)

Armament:
      15 - 6.00" / 152 mm 50.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1932 Model
   5 x Triple mounts on centreline forward
  2 raised mounts - superfiring
      12 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts, 1932 Model
   6 x Twin mounts on sides, forward deck aft
      24 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 150 per gun
   Anti-air guns in deck mounts, 1932 Model
   4 x 2 row sextuple mounts on sides, aft deck forward
  4 raised mounts
      Weight of broadside 1,935 lbs / 877 kg
      16 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.469 t each, 23.507 t total
 In 4 sets of deck mounted side rotating tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 460.00 ft / 140.21 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 106 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  0.80" / 20 mm 460.00 ft / 140.21 m 21.00 ft / 6.40 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armoured deck - multiple decks: 2.00" / 51 mm For and Aft decks
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 158,334 shp / 118,117 Kw = 37.00 kts
 Range 5,600nm at 17.00 kts
 Bunker at max displacement = 1,900 tons

Complement:
 644 - 838

Cost:
 £5.405 million / $21.620 million

Distribution of weights at normal displacement:
 Armament: 556 tons, 4.0 %
    - Guns: 532 tons, 3.8 %
    - Torpedoes: 24 tons, 0.2 %
 Armour: 2,731 tons, 19.4 %
    - Belts: 898 tons, 6.4 %
    - Torpedo bulkhead: 286 tons, 2.0 %
    - Armament: 394 tons, 2.8 %
    - Armour Deck: 1,152 tons, 8.2 %
 Machinery: 3,788 tons, 27.0 %
 Hull, fittings & equipment: 5,449 tons, 38.8 %
 Fuel, ammunition & stores: 1,521 tons, 10.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   17,609 lbs / 7,987 Kg = 163.0 x 6.0 " / 152 mm shells or 2.2 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 3.1 ft / 1.0 m
 Roll period: 15.2 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.46
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and large transom stern
 Block coefficient (normal/deep): 0.550 / 0.558
 Length to Beam Ratio: 10.39 : 1
 'Natural speed' for length: 29.19 kts
 Power going to wave formation at top speed: 62 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 8.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 32.00 %,  33.00 ft / 10.06 m,  27.00 ft / 8.23 m
    - Forward deck: 30.00 %,  27.00 ft / 8.23 m,  27.00 ft / 8.23 m
    - Aft deck: 23.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
    - Quarter deck: 15.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
    - Average freeboard:  24.73 ft / 7.54 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 148.6 %
  - Above water (accommodation/working, high = better): 211.5 %
 Waterplane Area: 30,923 Square feet or 2,873 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 110 lbs/sq ft or 538 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.65
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

A 35 knot British light cruiser for 1921

I was hoping that a British light cruiser for 1921 that could make 35 knots might not have to be so large, but this one is over 10,000 tons standard. The armament is 9-6in/50 QF guns, 6-4.7in AA guns, and 12-21in TT. The armour belt is 3in and the deck is 2in. I suppose that having the underwater protection like this is what makes the design have to be large:

GB/CL/1921, Great Britain Light Cruiser laid down 1921 (Engine 1941)

Displacement:
 10,248 t light; 10,605 t standard; 11,409 t normal; 12,053 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (640.08 ft / 636.00 ft) x 62.00 ft x (19.00 / 19.81 ft)
 (195.10 m / 193.85 m) x 18.90 m  x (5.79 / 6.04 m)

Armament:
      9 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1921 Model
   3 x Triple mounts on centreline ends, evenly spread
      6 - 4.70" / 119 mm 45.0 cal guns - 52.35lbs / 23.75kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts, 1921 Model
   6 x Single mounts on sides, aft deck forward
  6 raised mounts
      Weight of broadside 1,343 lbs / 609 kg
      12 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.425 t each, 17.102 t total
 In 4 sets of deck mounted side rotating tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 415.00 ft / 126.49 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 100 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  0.70" / 18 mm 415.00 ft / 126.49 m 19.00 ft / 5.79 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 2.00" / 51 mm For and Aft decks
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 4.00" / 102 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 120,149 shp / 89,631 Kw = 35.00 kts
 Range 5,200nm at 16.00 kts
 Bunker at max displacement = 1,448 tons

Complement:
 551 - 717

Cost:
 £2.396 million / $9.584 million

Distribution of weights at normal displacement:
 Armament: 363 tons, 3.2 %
    - Guns: 346 tons, 3.0 %
    - Torpedoes: 17 tons, 0.1 %
 Armour: 2,373 tons, 20.8 %
    - Belts: 818 tons, 7.2 %
    - Torpedo bulkhead: 204 tons, 1.8 %
    - Armament: 273 tons, 2.4 %
    - Armour Deck: 1,035 tons, 9.1 %
    - Conning Tower: 44 tons, 0.4 %
 Machinery: 3,175 tons, 27.8 %
 Hull, fittings & equipment: 4,336 tons, 38.0 %
 Fuel, ammunition & stores: 1,162 tons, 10.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   14,633 lbs / 6,637 Kg = 135.5 x 6.0 " / 152 mm shells or 2.0 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 3.4 ft / 1.0 m
 Roll period: 14.2 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.30
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and small transom stern
 Block coefficient (normal/deep): 0.533 / 0.540
 Length to Beam Ratio: 10.26 : 1
 'Natural speed' for length: 26.97 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 8.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  29.00 ft / 8.84 m,  27.00 ft / 8.23 m
    - Forward deck: 15.00 %,  27.00 ft / 8.23 m,  27.00 ft / 8.23 m
    - Aft deck: 50.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
    - Quarter deck: 15.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
    - Average freeboard:  21.96 ft / 6.69 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 150.3 %
  - Above water (accommodation/working, high = better): 196.5 %
 Waterplane Area: 27,746 Square feet or 2,578 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 102 lbs/sq ft or 499 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.32
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

My concept for a fast battlecruiser with 10-15in guns

The GB/CB/1921 design study is my current concept for what a fast, lightly armoured battlecruiser should be. This is a flush-decked ship with a flared bow and a wide transom stern. The main armament is in two quadruple turrets and one superfiring twin turret. The armour is all-or-nothing style, but only a 5in inclined belt. I thought that the ship needed a 33 knot speed. This is the Springsharp report:

GB/CB/1921, Great Britain Battlecruiser laid down 1921 (Engine 1950)

Displacement:
 32,346 t light; 34,134 t standard; 36,346 t normal; 38,115 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (813.39 ft / 800.00 ft) x 102.00 ft x (28.50 / 29.55 ft)
 (247.92 m / 243.84 m) x 31.09 m  x (8.69 / 9.01 m)

Armament:
      10 - 15.00" / 381 mm 45.0 cal guns - 1,950.00lbs / 884.51kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1921 Model
   2 x Quad mounts on centreline ends, evenly spread
   1 x Twin mount on centreline, forward deck centre
  1 raised mount
      16 - 5.00" / 127 mm 50.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1921 Model
   8 x Twin mounts on sides, evenly spread
  4 raised mounts
      Weight of broadside 20,540 lbs / 9,317 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 445.00 ft / 135.64 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 86 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  4.00" / 102 mm 445.00 ft / 135.64 m 28.50 ft / 8.69 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 7.00" / 178 mm 5.00" / 127 mm  7.00" / 178 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 3.00" / 76 mm For and Aft decks
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 7.00" / 178 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 171,431 shp / 127,887 Kw = 33.00 kts
 Range 6,500nm at 17.00 kts
 Bunker at max displacement = 3,980 tons

Complement:
 1,316 - 1,711

Cost:
 £8.667 million / $34.669 million

Distribution of weights at normal displacement:
 Armament: 3,079 tons, 8.5 %
 Armour: 8,859 tons, 24.4 %
    - Belts: 1,656 tons, 4.6 %
    - Torpedo bulkhead: 1,877 tons, 5.2 %
    - Armament: 1,853 tons, 5.1 %
    - Armour Deck: 3,308 tons, 9.1 %
    - Conning Tower: 165 tons, 0.5 %
 Machinery: 4,101 tons, 11.3 %
 Hull, fittings & equipment: 16,307 tons, 44.9 %
 Fuel, ammunition & stores: 4,000 tons, 11.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   53,072 lbs / 24,073 Kg = 31.5 x 15.0 " / 381 mm shells or 8.2 torpedoes
 Stability (Unstable if below 1.00): 1.20
 Metacentric height 7.2 ft / 2.2 m
 Roll period: 16.0 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.80
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and large transom stern
 Block coefficient (normal/deep): 0.547 / 0.553
 Length to Beam Ratio: 7.84 : 1
 'Natural speed' for length: 32.74 kts
 Power going to wave formation at top speed: 55 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 17.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  34.00 ft / 10.36 m,  27.00 ft / 8.23 m
    - Forward deck: 30.00 %,  27.00 ft / 8.23 m,  23.00 ft / 7.01 m
    - Aft deck: 35.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Quarter deck: 15.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Average freeboard:  24.96 ft / 7.61 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 98.4 %
  - Above water (accommodation/working, high = better): 204.7 %
 Waterplane Area: 59,118 Square feet or 5,492 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 213 lbs/sq ft or 1,041 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.46
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

A radical GB/CB/1915 design

This design for a GB/CB/1915 battlecruiser seems inspired by the Super Lion concept. The ship has 10-15in/45 guns (as originally specified, not the real 15in/42 guns) and 16-5in/50 QF guns in shields, mounted on the deck. The armour is light, the machinery is a light as is possible. The speed is 32 knots. The original specification had a beam of 90ft, but a viable design is not possible in Springsharp with such a narrow beam. This is the Springsharp report:

GB/CB/1915, Great Britain Battlecruiser laid down 1915 (Engine 1950)

Displacement:
 33,175 t light; 34,959 t standard; 36,852 t normal; 38,366 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (807.00 ft / 800.00 ft) x 104.00 ft x (26.50 / 27.38 ft)
 (245.97 m / 243.84 m) x 31.70 m  x (8.08 / 8.35 m)

Armament:
      10 - 15.00" / 381 mm 45.0 cal guns - 1,920.00lbs / 870.90kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1915 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
   1 x Twin mount on centreline, aft deck forward
      16 - 5.00" / 127 mm 50.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1915 Model
   16 x Single mounts on sides, evenly spread
  4 raised mounts
      Weight of broadside 20,240 lbs / 9,181 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 5.00" / 127 mm 575.00 ft / 175.26 m 17.00 ft / 5.18 m
 Ends: 3.00" / 76 mm 200.00 ft / 60.96 m 12.00 ft / 3.66 m
   25.00 ft / 7.62 m Unarmoured ends
   Main Belt covers 111 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 575.00 ft / 175.26 m 26.50 ft / 8.08 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 7.00" / 178 mm 5.00" / 127 mm  7.00" / 178 mm
 2nd: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm

   - Armoured deck - multiple decks: 3.00" / 76 mm For and Aft decks
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 7.00" / 178 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 182,116 shp / 135,859 Kw = 32.00 kts
 Range 6,500nm at 16.00 kts
 Bunker at max displacement = 3,407 tons

Complement:
 1,329 - 1,728

Cost:
 £5.047 million / $20.188 million

Distribution of weights at normal displacement:
 Armament: 3,141 tons, 8.5 %
 Armour: 9,321 tons, 25.3 %
    - Belts: 2,304 tons, 6.3 %
    - Torpedo bulkhead: 1,128 tons, 3.1 %
    - Armament: 2,368 tons, 6.4 %
    - Armour Deck: 3,355 tons, 9.1 %
    - Conning Tower: 167 tons, 0.5 %
 Machinery: 4,357 tons, 11.8 %
 Hull, fittings & equipment: 16,355 tons, 44.4 %
 Fuel, ammunition & stores: 3,677 tons, 10.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   54,224 lbs / 24,596 Kg = 32.1 x 15.0 " / 381 mm shells or 7.7 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 7.1 ft / 2.2 m
 Roll period: 16.4 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.87
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has rise forward of midbreak,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.585 / 0.589
 Length to Beam Ratio: 7.69 : 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): -3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 30.00 %,  32.00 ft / 9.75 m,  29.00 ft / 8.84 m
    - Forward deck: 37.00 %,  29.00 ft / 8.84 m,  28.00 ft / 8.53 m
    - Aft deck: 18.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Quarter deck: 15.00 %,  20.00 ft / 6.10 m,  21.00 ft / 6.40 m
    - Average freeboard:  26.28 ft / 8.01 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 99.3 %
  - Above water (accommodation/working, high = better): 221.2 %
 Waterplane Area: 60,003 Square feet or 5,574 Square metres
 Displacement factor (Displacement / loading): 108 %
 Structure weight / hull surface area: 210 lbs/sq ft or 1,023 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.32
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

My Ger/BB/1916 concept with 20in guns

When I was working in Minneapolis, in early 2002, I had this concept for a German battleship that I called the Ger/BB/1916, that had 9-20in guns. This version has a fast battleship speed, at least by American standards in 1940. My sketch design had twin funnels and a tower foremast topped by a gun director with a long rangefinder. This is my Springsharp report:

Ger/BB/1916, Germany Battleship laid down 1916 (Engine 1927)

Displacement:
 70,188 t light; 73,852 t standard; 79,390 t normal; 83,821 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (792.64 ft / 785.00 ft) x 138.00 ft x (38.00 / 39.83 ft)
 (241.60 m / 239.27 m) x 42.06 m  x (11.58 / 12.14 m)

Armament:
      9 - 20.00" / 508 mm 45.0 cal guns - 4,320.00lbs / 1,959.52kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1916 Model
   3 x Single mounts on centreline ends, majority forward
      24 - 5.00" / 127 mm 50.0 cal guns - 66.16lbs / 30.01kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1916 Model
   12 x Twin mounts on sides, evenly spread
  4 raised mounts
      Weight of broadside 40,468 lbs / 18,356 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 20.0" / 508 mm 430.00 ft / 131.06 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 84 % of normal length

   - Torpedo Bulkhead:
  7.00" / 178 mm 430.00 ft / 131.06 m 38.00 ft / 11.58 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 20.0" / 508 mm 15.0" / 381 mm  20.0" / 508 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: 6.00" / 152 mm  Quarter deck: 8.00" / 203 mm

   - Conning towers: Forward 20.00" / 508 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 160,628 shp / 119,828 Kw = 27.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 9,970 tons

Complement:
 2,364 - 3,074

Cost:
 £10.990 million / $43.961 million

Distribution of weights at normal displacement:
 Armament: 6,867 tons, 8.6 %
 Armour: 32,576 tons, 41.0 %
    - Belts: 6,872 tons, 8.7 %
    - Torpedo bulkhead: 4,232 tons, 5.3 %
    - Armament: 8,512 tons, 10.7 %
    - Armour Deck: 12,165 tons, 15.3 %
    - Conning Tower: 796 tons, 1.0 %
 Machinery: 5,070 tons, 6.4 %
 Hull, fittings & equipment: 25,675 tons, 32.3 %
 Fuel, ammunition & stores: 9,203 tons, 11.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   126,859 lbs / 57,542 Kg = 31.7 x 20.0 " / 508 mm shells or 27.7 torpedoes
 Stability (Unstable if below 1.00): 1.30
 Metacentric height 13.0 ft / 4.0 m
 Roll period: 16.1 seconds
 Steadiness - As gun platform (Average = 50 %): 59 %
   - Recoil effect (Restricted arc if above 1.00): 0.44
 Seaboat quality  (Average = 1.00): 1.18

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.675 / 0.680
 Length to Beam Ratio: 5.69 : 1
 'Natural speed' for length: 28.02 kts
 Power going to wave formation at top speed: 53 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 8.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 30.00 %,  33.00 ft / 10.06 m,  26.00 ft / 7.92 m
    - Forward deck: 25.00 %,  26.00 ft / 7.92 m,  23.00 ft / 7.01 m
    - Aft deck: 30.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Quarter deck: 15.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Average freeboard:  25.12 ft / 7.66 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 72.0 %
  - Above water (accommodation/working, high = better): 162.0 %
 Waterplane Area: 84,899 Square feet or 7,887 Square metres
 Displacement factor (Displacement / loading): 104 %
 Structure weight / hull surface area: 256 lbs/sq ft or 1,248 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.59
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent

A new version of the "Ger/CB/1905 Flush-Decked" design

I have a new version of my Ger/CB/1905 Flush-Decked Design. This depends on having lightweight machinery to work, as well as oil fuel. Still, the concept seems to work fairly well. The concept dates from the early 1970's and included a pencil sketch. My photo dates from April 2005. This is the Springsharp report:

Ger/CB/1905 Flush Deck, Germany Battlecruiser laid down 1905 (Engine 1921)

Displacement:
 19,048 t light; 19,917 t standard; 21,432 t normal; 22,644 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (562.00 ft / 560.00 ft) x 94.00 ft x (25.00 / 26.13 ft)
 (171.30 m / 170.69 m) x 28.65 m  x (7.62 / 7.97 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 850.00lbs / 385.55kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1905 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      12 - 6.00" / 152 mm 45.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Breech loading guns in casemate mounts, 1905 Model
   12 x Single mounts on sides amidships
      Weight of broadside 8,000 lbs / 3,629 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.0" / 254 mm 375.00 ft / 114.30 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 7.00" / 178 mm 375.00 ft / 114.30 m 8.00 ft / 2.44 m
   Main Belt covers 103 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 375.00 ft / 114.30 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 7.00" / 178 mm  9.00" / 229 mm
 2nd: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm

   - Armoured deck - multiple decks: 3.00" / 76 mm For and Aft decks
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 9.00" / 229 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 77,901 shp / 58,114 Kw = 27.00 kts
 Range 5,600nm at 16.00 kts
 Bunker at max displacement = 2,727 tons

Complement:
 885 - 1,151

Cost:
 £1.755 million / $7.019 million

Distribution of weights at normal displacement:
 Armament: 1,434 tons, 6.7 %
 Armour: 7,277 tons, 34.0 %
    - Belts: 2,228 tons, 10.4 %
    - Torpedo bulkhead: 1,041 tons, 4.9 %
    - Armament: 1,764 tons, 8.2 %
    - Armour Deck: 2,094 tons, 9.8 %
    - Conning Tower: 150 tons, 0.7 %
 Machinery: 2,683 tons, 12.5 %
 Hull, fittings & equipment: 7,655 tons, 35.7 %
 Fuel, ammunition & stores: 2,384 tons, 11.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   34,490 lbs / 15,645 Kg = 39.9 x 12.0 " / 305 mm shells or 6.3 torpedoes
 Stability (Unstable if below 1.00): 1.29
 Metacentric height 7.2 ft / 2.2 m
 Roll period: 14.7 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.38
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.570 / 0.576
 Length to Beam Ratio: 5.96 : 1
 'Natural speed' for length: 23.66 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  27.00 ft / 8.23 m,  24.00 ft / 7.32 m
    - Forward deck: 30.00 %,  24.00 ft / 7.32 m,  20.00 ft / 6.10 m
    - Aft deck: 35.00 %,  20.00 ft / 6.10 m,  18.00 ft / 5.49 m
    - Quarter deck: 15.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  20.99 ft / 6.40 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 90.4 %
  - Above water (accommodation/working, high = better): 164.2 %
 Waterplane Area: 37,433 Square feet or 3,478 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 161 lbs/sq ft or 785 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.75
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent