A Super Lion (GB/CB/1912) design

This is my latest attempt at a Super Lion design (the GB/CB/1912) with 10-15in guns and a 30-knot speed. One lesson I learned is that this ship has to be large to have the necessary characteristics:

GB/CB/1912 Super Lion, Great Britain Battlecruiser laid down 1912 (Engine 1917)

Displacement:
 37,318 t light; 39,860 t standard; 43,687 t normal; 46,749 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (787.00 ft / 780.00 ft) x 102.00 ft x (31.25 / 33.07 ft)
 (239.88 m / 237.74 m) x 31.09 m  x (9.53 / 10.08 m)

Armament:
      10 - 15.00" / 381 mm 42.0 cal guns - 1,950.01lbs / 884.51kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1912 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
   1 x Twin mount on centreline, aft deck forward
      16 - 4.00" / 102 mm 45.0 cal guns - 31.99lbs / 14.51kg shells, 150 per gun
   Breech loading guns in casemate mounts, 1912 Model
   12 x Single mounts on centreline, forward deck aft
  4 raised mounts
   4 x Single mounts on sides, aft deck forward
      Weight of broadside 20,012 lbs / 9,077 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 9.00" / 229 mm 580.00 ft / 176.78 m 9.00 ft / 2.74 m
 Ends: 5.00" / 127 mm 200.00 ft / 60.96 m 12.00 ft / 3.66 m
 Upper: 7.00" / 178 mm 580.00 ft / 176.78 m 8.00 ft / 2.44 m
   Main Belt covers 114 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 580.00 ft / 176.78 m 31.25 ft / 9.53 m
 Beam between torpedo bulkheads 58.00 ft / 17.68 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 8.00" / 203 mm  10.0" / 254 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

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

   - Conning towers: Forward 10.00" / 254 mm, Aft 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 158,499 shp / 118,240 Kw = 30.00 kts
 Range 8,500nm at 16.00 kts
 Bunker at max displacement = 6,889 tons

Complement:
 1,510 - 1,964

Cost:
 £3.568 million / $14.274 million

Distribution of weights at normal displacement:
 Armament: 2,616 tons, 6.0 %
    - Guns: 2,616 tons, 6.0 %
 Armour: 12,436 tons, 28.5 %
    - Belts: 3,746 tons, 8.6 %
    - Torpedo bulkhead: 1,341 tons, 3.1 %
    - Armament: 3,572 tons, 8.2 %
    - Armour Deck: 3,295 tons, 7.5 %
    - Conning Towers: 481 tons, 1.1 %
 Machinery: 5,810 tons, 13.3 %
 Hull, fittings & equipment: 16,456 tons, 37.7 %
 Fuel, ammunition & stores: 6,369 tons, 14.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   62,575 lbs / 28,383 Kg = 37.1 x 15.0 " / 381 mm shells or 8.8 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 6.7 ft / 2.1 m
 Roll period: 16.5 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.86
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.615 / 0.622
 Length to Beam Ratio: 7.65 : 1
 'Natural speed' for length: 27.93 kts
 Power going to wave formation at top speed: 53 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 24.00 %,  30.00 ft / 9.14 m,  27.00 ft / 8.23 m
    - Forward deck: 25.00 %,  27.00 ft / 8.23 m,  26.00 ft / 7.92 m
    - Aft deck: 18.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 33.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  24.01 ft / 7.32 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 132.8 %
  - Above water (accommodation/working, high = better): 195.7 %
 Waterplane Area: 59,008 Square feet or 5,482 Square metres
 Displacement factor (Displacement / loading): 115 %
 Structure weight / hull surface area: 208 lbs/sq ft or 1,015 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.99
  - Longitudinal: 1.19
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

A biography of William Hovgaard from MIT

MIT has a biography of the Danish naval architect William Hovgaard, who taught at MIT for an extended period.

My "classic" design for the Ger/CB/1906

This Springsharp design is faithful to my original concept and specification for the Ger/CB/1906 battlecruisers. The design is centered around a short, thin belt that is inclined outwards and topped by a 3in deck. The turrets and barbettes are 6in thick. The speed is the original 33 knots. By agreement, all of our designs from this period had oil fuel and direct-drive turbines. We also allowed the anachronistic outward angled belt. This is the Springsharp report:

Ger/CB/1906, Germany Battlecruiser laid down 1906 (Engine 1916)

Displacement:
 24,440 t light; 25,366 t standard; 27,704 t normal; 29,574 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (803.00 ft / 800.00 ft) x 85.00 ft x (25.60 / 26.97 ft)
 (244.75 m / 243.84 m) x 25.91 m  x (7.80 / 8.22 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, 1906 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      12 - 4.00" / 102 mm 45.0 cal guns - 31.99lbs / 14.51kg shells, 150 per gun
   Breech loading guns in deck and hoist mounts, 1906 Model
   6 x Single mounts on sides, forward deck aft
   6 x Single mounts on sides, aft deck forward
      Weight of broadside 7,184 lbs / 3,259 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 425.00 ft / 129.54 m 18.00 ft / 5.49 m
 Ends: Unarmoured
   Main Belt covers 82 % of normal length
   Main belt does not fully cover magazines and engineering spaces
   Main Belt inclined 16.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 425.00 ft / 129.54 m 25.60 ft / 7.80 m
 Beam between torpedo bulkheads 62.00 ft / 18.90 m

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

   - Armoured deck - single deck:
 For and Aft decks: 3.00" / 76 mm
 Forecastle: 0.00" / 0 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 6.00" / 152 mm, Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 164,934 shp / 123,041 Kw = 33.00 kts
 Range 6,500nm at 16.00 kts
 Bunker at max displacement = 4,207 tons

Complement:
 1,073 - 1,395

Cost:
 £2.404 million / $9.615 million

Distribution of weights at normal displacement:
 Armament: 1,346 tons, 4.9 %
    - Guns: 1,346 tons, 4.9 %
 Armour: 5,848 tons, 21.1 %
    - Belts: 1,313 tons, 4.7 %
    - Torpedo bulkhead: 604 tons, 2.2 %
    - Armament: 1,604 tons, 5.8 %
    - Armour Deck: 2,209 tons, 8.0 %
    - Conning Tower: 118 tons, 0.4 %
 Machinery: 6,145 tons, 22.2 %
 Hull, fittings & equipment: 11,101 tons, 40.1 %
 Fuel, ammunition & stores: 3,264 tons, 11.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   37,316 lbs / 16,926 Kg = 43.2 x 12.0 " / 305 mm shells or 4.2 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 4.9 ft / 1.5 m
 Roll period: 16.1 seconds
 Steadiness - As gun platform (Average = 50 %): 62 %
   - Recoil effect (Restricted arc if above 1.00): 0.74
 Seaboat quality  (Average = 1.00): 1.23

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.557 / 0.564
 Length to Beam Ratio: 9.41 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 53 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -1.00 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 %,  33.00 ft / 10.06 m,  29.00 ft / 8.84 m
    - Forward deck: 30.00 %,  29.00 ft / 8.84 m,  28.00 ft / 8.53 m
    - Aft deck: 19.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Quarter deck: 31.00 %,  20.00 ft / 6.10 m,  21.00 ft / 6.40 m
    - Average freeboard:  26.35 ft / 8.03 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 129.5 %
  - Above water (accommodation/working, high = better): 240.0 %
 Waterplane Area: 47,769 Square feet or 4,438 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 160 lbs/sq ft or 782 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.18
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

The GB/CB/1916 (Hood style)

I had this concept for a variant of the GB/CB/1916 design that would rather Hood-like with 9-16.5in/45 and 16-6in QF guns with a 32.5 knot speed. The thickest part of the belt is 12in and the ship uses "all or nothing" protection. The "look" is similar to the 36-knot ship, which is an intermediate type between the Repulse and the Hood.

GB/CB/1916, Great Britain Battlecruiser laid down 1916 (Engine 1923)

Displacement:
 49,840 t light; 52,115 t standard; 55,152 t normal; 57,581 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (921.17 ft / 915.00 ft) x 112.00 ft x (34.00 / 35.18 ft)
 (280.77 m / 278.89 m) x 34.14 m  x (10.36 / 10.72 m)

Armament:
      9 - 16.50" / 419 mm 45.0 cal guns - 2,265.01lbs / 1,027.39kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1916 Model
   3 x Triple mounts on centreline ends, majority forward
      16 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1916 Model
   8 x Single mounts on sides, forward deck aft
  2 raised mounts - superfiring
   8 x Single mounts on sides, aft deck forward
  2 raised mounts - superfiring
      Weight of broadside 22,214 lbs / 10,076 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 635.00 ft / 193.55 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 9.00" / 229 mm 635.00 ft / 193.55 m 8.00 ft / 2.44 m
   Main Belt covers 107 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 635.00 ft / 193.55 m 34.00 ft / 10.36 m
 Beam between torpedo bulkheads 78.00 ft / 23.77 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 10.0" / 254 mm  14.0" / 356 mm
 2nd: 5.00" / 127 mm 4.00" / 102 mm  5.00" / 127 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 4.00" / 102 mm
 Forecastle: 4.00" / 102 mm  Quarter deck: 4.00" / 102 mm

   - Conning towers: Forward 14.00" / 356 mm, Aft 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 6 shafts, 229,235 shp / 171,009 Kw = 32.50 kts
 Range 6,500nm at 16.00 kts
 Bunker at max displacement = 5,466 tons

Complement:
 1,799 - 2,339

Cost:
 £8.033 million / $32.132 million

Distribution of weights at normal displacement:
 Armament: 3,807 tons, 6.9 %
    - Guns: 3,807 tons, 6.9 %
 Armour: 16,802 tons, 30.5 %
    - Belts: 4,752 tons, 8.6 %
    - Torpedo bulkhead: 1,598 tons, 2.9 %
    - Armament: 4,388 tons, 8.0 %
    - Armour Deck: 5,346 tons, 9.7 %
    - Conning Towers: 718 tons, 1.3 %
 Machinery: 7,662 tons, 13.9 %
 Hull, fittings & equipment: 21,570 tons, 39.1 %
 Fuel, ammunition & stores: 5,311 tons, 9.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   77,326 lbs / 35,075 Kg = 34.4 x 16.5 " / 419 mm shells or 10.4 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 7.5 ft / 2.3 m
 Roll period: 17.1 seconds
 Steadiness - As gun platform (Average = 50 %): 62 %
   - Recoil effect (Restricted arc if above 1.00): 0.74
 Seaboat quality  (Average = 1.00): 1.24

Hull form characteristics:
 Hull has low quarterdeck ,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.554 / 0.559
 Length to Beam Ratio: 8.17 : 1
 'Natural speed' for length: 30.25 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 10.00 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 %,  35.00 ft / 10.67 m,  30.00 ft / 9.14 m
    - Forward deck: 30.00 %,  30.00 ft / 9.14 m,  29.00 ft / 8.84 m
    - Aft deck: 17.00 %,  29.00 ft / 8.84 m,  29.00 ft / 8.84 m
    - Quarter deck: 33.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Average freeboard:  27.44 ft / 8.36 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 114.1 %
  - Above water (accommodation/working, high = better): 222.9 %
 Waterplane Area: 71,789 Square feet or 6,669 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 221 lbs/sq ft or 1,080 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.23
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

A new version of the GB/CB/1916 fast battlecruiser photograph

I wanted to change some parts of this photograph. I just finished the job, although I keep making changes to it, if anyone has noticed. This is another attempt at a Springsharp design:

GB/CB/1916, Great Britain Battlecruiser laid down 1916 (Engine 1923)

Displacement:
 41,938 t light; 43,640 t standard; 46,358 t normal; 48,533 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (871.35 ft / 865.00 ft) x 106.00 ft x (32.00 / 33.19 ft)
 (265.59 m / 263.65 m) x 32.31 m  x (9.75 / 10.12 m)

Armament:
      6 - 16.50" / 419 mm 45.0 cal guns - 2,265.01lbs / 1,027.39kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1916 Model
   2 x Triple mounts on centreline, forward deck forward
      10 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1916 Model
   10 x Single mounts on sides, forward deck aft
  2 raised mounts - superfiring
      Weight of broadside 14,733 lbs / 6,683 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 9.00" / 229 mm 565.00 ft / 172.21 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 7.00" / 178 mm 565.00 ft / 172.21 m 8.00 ft / 2.44 m
   Main Belt covers 100 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 565.00 ft / 172.21 m 32.00 ft / 9.75 m
 Beam between torpedo bulkheads 68.00 ft / 20.73 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: 5.00" / 127 mm 4.00" / 102 mm  5.00" / 127 mm

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

   - Conning towers: Forward 9.00" / 229 mm, Aft 7.00" / 178 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 6 shafts, 317,040 shp / 236,512 Kw = 36.00 kts
 Range 6,500nm at 16.00 kts
 Bunker at max displacement = 4,893 tons

Complement:
 1,579 - 2,053

Cost:
 £7.099 million / $28.394 million

Distribution of weights at normal displacement:
 Armament: 2,515 tons, 5.4 %
    - Guns: 2,515 tons, 5.4 %
 Armour: 10,695 tons, 23.1 %
    - Belts: 3,255 tons, 7.0 %
    - Torpedo bulkhead: 1,338 tons, 2.9 %
    - Armament: 2,073 tons, 4.5 %
    - Armour Deck: 3,584 tons, 7.7 %
    - Conning Towers: 445 tons, 1.0 %
 Machinery: 10,596 tons, 22.9 %
 Hull, fittings & equipment: 18,131 tons, 39.1 %
 Fuel, ammunition & stores: 4,420 tons, 9.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   55,474 lbs / 25,163 Kg = 24.7 x 16.5 " / 419 mm shells or 6.3 torpedoes
 Stability (Unstable if below 1.00): 1.24
 Metacentric height 8.0 ft / 2.5 m
 Roll period: 15.7 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.54
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has low quarterdeck ,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.553 / 0.558
 Length to Beam Ratio: 8.16 : 1
 'Natural speed' for length: 29.41 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 10.00 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 %,  36.00 ft / 10.97 m,  31.00 ft / 9.45 m
    - Forward deck: 30.00 %,  31.00 ft / 9.45 m,  30.00 ft / 9.14 m
    - Aft deck: 17.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Quarter deck: 33.00 %,  23.00 ft / 7.01 m,  23.00 ft / 7.01 m
    - Average freeboard:  28.44 ft / 8.67 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 157.6 %
  - Above water (accommodation/working, high = better): 234.7 %
 Waterplane Area: 64,170 Square feet or 5,962 Square metres
 Displacement factor (Displacement / loading): 103 %
 Structure weight / hull surface area: 202 lbs/sq ft or 984 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.41
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

What was actually possible with the GB/CB/1912 Fast design

I originally wanted a displacement of 29,000 tons and 180,000 SHP for power. If we use figures close to those, we don't see 38 knots, but more like 34 knots:

GB/CB/1910 Fast 34 knots, Great Britain Battlecruiser laid down 1910 (Engine 1918)

Displacement:
 27,244 t light; 28,146 t standard; 30,454 t normal; 32,301 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (854.78 ft / 850.00 ft) x 95.00 ft x (33.00 / 34.30 ft)
 (260.54 m / 259.08 m) x 28.96 m  x (10.06 / 10.45 m)

Armament:
      4 - 13.50" / 343 mm 45.0 cal guns - 1,250.00lbs / 566.99kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1910 Model
   2 x Twin mounts on centreline ends, evenly spread
      16 - 4.00" / 102 mm 45.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1910 Model
   16 x Single mounts on sides, forward deck aft
  4 raised mounts - superfiring
      Weight of broadside 5,512 lbs / 2,500 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 475.00 ft / 144.78 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 86 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 475.00 ft / 144.78 m 33.00 ft / 10.06 m
 Beam between torpedo bulkheads 64.00 ft / 19.51 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 2.00" / 51 mm  4.00" / 102 mm

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

   - Conning towers: Forward 8.00" / 203 mm, Aft 5.00" / 127 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 182,011 shp / 135,780 Kw = 34.07 kts
 Range 6,499nm at 16.00 kts
 Bunker at max displacement = 4,155 tons

Complement:
 1,152 - 1,498

Cost:
 £2.386 million / $9.543 million

Distribution of weights at normal displacement:
 Armament: 995 tons, 3.3 %
    - Guns: 995 tons, 3.3 %
 Armour: 6,973 tons, 22.9 %
    - Belts: 1,934 tons, 6.3 %
    - Torpedo bulkhead: 870 tons, 2.9 %
    - Armament: 1,121 tons, 3.7 %
    - Armour Deck: 2,776 tons, 9.1 %
    - Conning Towers: 273 tons, 0.9 %
 Machinery: 6,566 tons, 21.6 %
 Hull, fittings & equipment: 12,710 tons, 41.7 %
 Fuel, ammunition & stores: 3,210 tons, 10.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   47,134 lbs / 21,380 Kg = 38.3 x 13.5 " / 343 mm shells or 5.8 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 6.5 ft / 2.0 m
 Roll period: 15.6 seconds
 Steadiness - As gun platform (Average = 50 %): 79 %
   - Recoil effect (Restricted arc if above 1.00): 0.41
 Seaboat quality  (Average = 1.00): 1.60

Hull form characteristics:
 Hull has low quarterdeck ,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.400 / 0.408
 Length to Beam Ratio: 8.95 : 1
 'Natural speed' for length: 29.15 kts
 Power going to wave formation at top speed: 48 %
 Trim (Max stability = 0, Max steadiness = 100): 49
 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 %,  34.00 ft / 10.36 m,  31.00 ft / 9.45 m
    - Forward deck: 30.00 %,  31.00 ft / 9.45 m,  30.00 ft / 9.14 m
    - Aft deck: 17.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Quarter deck: 33.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Average freeboard:  27.95 ft / 8.52 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 127.1 %
  - Above water (accommodation/working, high = better): 249.2 %
 Waterplane Area: 49,706 Square feet or 4,618 Square metres
 Displacement factor (Displacement / loading): 122 %
 Structure weight / hull surface area: 166 lbs/sq ft or 808 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.64
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather

The GB/CB/1910 Fast design

The GB/CB/1910 Fast design in the "Red Book" is a rather minimalist listing. I was, as always, extremely over-optimistic about how much displacement and power would be required. The ship is in the spirit of the original GB/CB/1905 design, but with much higher speed (38 knots). With Springsharp 3.0 Beta 3, we have the 38 knots. The ship has 4-13.5in guns and light armour. Back when this design was conceived, we always used oil fuel and all-or-nothing armour. This is the Springsharp report:

GB/CB/1910 Fast, Great Britain Battlecruiser laid down 1910 (Engine 1918)

Displacement:
 33,742 t light; 34,782 t standard; 37,383 t normal; 39,463 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (854.78 ft / 850.00 ft) x 95.00 ft x (33.00 / 34.36 ft)
 (260.54 m / 259.08 m) x 28.96 m  x (10.06 / 10.47 m)

Armament:
      4 - 13.50" / 343 mm 45.0 cal guns - 1,250.00lbs / 566.99kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1910 Model
   2 x Twin mounts on centreline ends, evenly spread
      16 - 4.00" / 102 mm 45.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1910 Model
   16 x Single mounts on sides, forward deck aft
  4 raised mounts - superfiring
      Weight of broadside 5,512 lbs / 2,500 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 475.00 ft / 144.78 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 86 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 475.00 ft / 144.78 m 33.00 ft / 10.06 m
 Beam between torpedo bulkheads 64.00 ft / 19.51 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 2.00" / 51 mm  4.00" / 102 mm

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

   - Conning towers: Forward 8.00" / 203 mm, Aft 5.00" / 127 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 6 shafts, 332,727 shp / 248,214 Kw = 38.00 kts
 Range 6,500nm at 16.00 kts
 Bunker at max displacement = 4,681 tons

Complement:
 1,343 - 1,747

Cost:
 £3.374 million / $13.497 million

Distribution of weights at normal displacement:
 Armament: 995 tons, 2.7 %
    - Guns: 995 tons, 2.7 %
 Armour: 7,221 tons, 19.3 %
    - Belts: 1,937 tons, 5.2 %
    - Torpedo bulkhead: 870 tons, 2.3 %
    - Armament: 1,121 tons, 3.0 %
    - Armour Deck: 2,980 tons, 8.0 %
    - Conning Towers: 313 tons, 0.8 %
 Machinery: 12,003 tons, 32.1 %
 Hull, fittings & equipment: 13,522 tons, 36.2 %
 Fuel, ammunition & stores: 3,641 tons, 9.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   35,148 lbs / 15,943 Kg = 28.6 x 13.5 " / 343 mm shells or 3.7 torpedoes
 Stability (Unstable if below 1.00): 1.30
 Metacentric height 7.4 ft / 2.3 m
 Roll period: 14.6 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.29
 Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
 Hull has low quarterdeck ,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.491 / 0.498
 Length to Beam Ratio: 8.95 : 1
 'Natural speed' for length: 29.15 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 49
 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 %,  34.00 ft / 10.36 m,  31.00 ft / 9.45 m
    - Forward deck: 30.00 %,  31.00 ft / 9.45 m,  30.00 ft / 9.14 m
    - Aft deck: 17.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Quarter deck: 33.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Average freeboard:  27.95 ft / 8.52 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 173.0 %
  - Above water (accommodation/working, high = better): 229.5 %
 Waterplane Area: 53,365 Square feet or 4,958 Square metres
 Displacement factor (Displacement / loading): 104 %
 Structure weight / hull surface area: 166 lbs/sq ft or 808 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.40
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

My simplified design for a G3 battlecruiser

This is my simplified design for a G3 battlecruiser. The Springsharp design is quite unsatisfactory:

GB/CB/1921 G3, Great Britain Battlecruiser laid down 1921 (Engine 1933)

Displacement:
 47,006 t light; 49,780 t standard; 52,345 t normal; 54,398 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (864.01 ft / 855.00 ft) x 106.00 ft x (32.50 / 33.54 ft)
 (263.35 m / 260.60 m) x 32.31 m  x (9.91 / 10.22 m)

Armament:
      9 - 16.00" / 406 mm 45.0 cal guns - 2,065.00lbs / 936.67kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1921 Model
   2 x Triple mounts on centreline, forward deck forward
  1 raised mount - superfiring
   1 x Triple mount on sides, forward deck aft
      16 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1921 Model
   2 x Twin mounts on sides, forward deck forward
   6 x Twin mounts on sides, aft 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 aft
      40 - 1.57" / 40.0 mm 45.0 cal guns - 1.97lbs / 0.89kg shells, 150 per gun
   Anti-air guns in deck mounts, 1921 Model
   4 x 2 row quad mounts on sides, forward deck forward
  4 raised mounts
   6 x 2 row quad mounts on sides, aft deck forward
  6 raised mounts
      Weight of broadside 20,721 lbs / 9,399 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 14.0" / 356 mm 570.00 ft / 173.74 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 11.0" / 279 mm   0.00 ft / 0.00 m 8.00 ft / 2.44 m
   Main Belt covers 103 % of normal length
   Main belt does not fully cover magazines and engineering spaces
   Main Belt inclined 17.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  4.00" / 102 mm 570.00 ft / 173.74 m 32.50 ft / 9.91 m
 Beam between torpedo bulkheads 66.00 ft / 20.12 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 10.0" / 254 mm  14.0" / 356 mm
 2nd: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 5.00" / 127 mm
 Forecastle: 5.00" / 127 mm  Quarter deck: 6.00" / 152 mm

   - Conning towers: Forward 14.00" / 356 mm, Aft 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 204,488 shp / 152,548 Kw = 32.00 kts
 Range 6,000nm at 16.00 kts
 Bunker at max displacement = 4,618 tons

Complement:
 1,729 - 2,249

Cost:
 £11.230 million / $44.918 million

Distribution of weights at normal displacement:
 Armament: 3,517 tons, 6.7 %
    - Guns: 3,517 tons, 6.7 %
 Armour: 17,820 tons, 34.0 %
    - Belts: 3,047 tons, 5.8 %
    - Torpedo bulkhead: 2,742 tons, 5.2 %
    - Armament: 4,772 tons, 9.1 %
    - Armour Deck: 6,597 tons, 12.6 %
    - Conning Towers: 663 tons, 1.3 %
 Machinery: 5,958 tons, 11.4 %
 Hull, fittings & equipment: 19,711 tons, 37.7 %
 Fuel, ammunition & stores: 5,339 tons, 10.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   76,365 lbs / 34,638 Kg = 37.3 x 16.0 " / 406 mm shells or 12.2 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 6.4 ft / 2.0 m
 Roll period: 17.6 seconds
 Steadiness - As gun platform (Average = 50 %): 58 %
   - Recoil effect (Restricted arc if above 1.00): 0.83
 Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and small transom stern
 Block coefficient (normal/deep): 0.622 / 0.626
 Length to Beam Ratio: 8.07 : 1
 'Natural speed' for length: 31.44 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: 2.00 ft / 0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  33.00 ft / 10.06 m,  29.00 ft / 8.84 m
    - Forward deck: 30.00 %,  29.00 ft / 8.84 m,  26.00 ft / 7.92 m
    - Aft deck: 30.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 15.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Average freeboard:  27.60 ft / 8.41 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 115.4 %
  - Above water (accommodation/working, high = better): 204.5 %
 Waterplane Area: 69,391 Square feet or 6,447 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 213 lbs/sq ft or 1,039 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.32
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

The G3 Battlecruiser as a desktop on your PC

You might have to make an adjustment, but this should work as your desktop, with it centered. Stretched will always work, but it will distort the picture.

My answer to Alt_Naval's G3 battlecruiser

I am a fan of the Alt_Naval web site. Alt_Naval was one of my inspirations in early 2005 to try my hand at ship photographs. Alt_Naval has a G3 battlecruiser photograph, but to my taste, it is too close to the Nelson and Rodney and not close enough to the G3 look. I thought that I could get closer, although my photographs has some rough edges.

An 8-gun GB/CB/1909 design

I thought that the next step would be an 8-gun GB/CB/1909 design. The main problem with the design is the large size and cost. What you have, though, is essentially a fast battleship. This is the Springsharp report:

GB/CB/1909, Great Britain Battlecruiser laid down 1909

Displacement:
 29,288 t light; 30,599 t standard; 35,272 t normal; 39,010 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (736.00 ft / 728.00 ft) x 95.00 ft x (30.00 / 32.60 ft)
 (224.33 m / 221.89 m) x 28.96 m  x (9.14 / 9.94 m)

Armament:
      8 - 13.50" / 343 mm 45.0 cal guns - 1,240.67lbs / 562.76kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1909 Model
   4 x Twin mounts on centreline ends, evenly spread
  1 raised mount - superfiring
      12 - 6.00" / 152 mm 45.0 cal guns - 108.93lbs / 49.41kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1909 Model
   12 x Single mounts on sides, forward deck aft
      Weight of broadside 11,233 lbs / 5,095 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 475.00 ft / 144.78 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 10.0" / 254 mm 475.00 ft / 144.78 m 8.00 ft / 2.44 m
   Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
  2.00" / 51 mm 455.00 ft / 138.68 m 30.00 ft / 9.14 m
 Beam between torpedo bulkheads 95.00 ft / 28.96 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 9.00" / 229 mm  12.0" / 305 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Protected deck - multiple decks:
 For and Aft decks: 4.00" / 102 mm
 Forecastle: 4.00" / 102 mm  Quarter deck: 4.00" / 102 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 93,167 shp / 69,503 Kw = 27.00 kts
 Range 8,500nm at 16.00 kts
 Bunker at max displacement = 8,411 tons

Complement:
 1,286 - 1,672

Cost:
 £2.606 million / $10.422 million

Distribution of weights at normal displacement:
 Armament: 1,928 tons, 5.5 %
    - Guns: 1,928 tons, 5.5 %
 Armour: 11,946 tons, 33.9 %
    - Belts: 3,799 tons, 10.8 %
    - Torpedo bulkhead: 1,010 tons, 2.9 %
    - Armament: 2,902 tons, 8.2 %
    - Armour Deck: 3,747 tons, 10.6 %
    - Conning Towers: 487 tons, 1.4 %
 Machinery: 4,235 tons, 12.0 %
 Hull, fittings & equipment: 11,180 tons, 31.7 %
 Fuel, ammunition & stores: 5,983 tons, 17.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   62,433 lbs / 28,319 Kg = 50.8 x 13.5 " / 343 mm shells or 9.2 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 6.0 ft / 1.8 m
 Roll period: 16.2 seconds
 Steadiness - As gun platform (Average = 50 %): 80 %
   - Recoil effect (Restricted arc if above 1.00): 0.78
 Seaboat quality  (Average = 1.00): 1.60

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.595 / 0.606
 Length to Beam Ratio: 7.66 : 1
 'Natural speed' for length: 26.98 kts
 Power going to wave formation at top speed: 49 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 28.00 %,  30.00 ft / 9.14 m,  28.00 ft / 8.53 m
    - Forward deck: 30.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Aft deck: 9.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Quarter deck: 33.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Average freeboard:  25.58 ft / 7.80 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 65.0 %
  - Above water (accommodation/working, high = better): 208.8 %
 Waterplane Area: 50,347 Square feet or 4,677 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 175 lbs/sq ft or 853 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.57
  - Overall: 1.00
 Excellent machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather

The GB/CB/1909 design

I thought that it would be interesting to see the battlecruiser analog to the GB/BB/1905 design. The battlecruiser is also well-protected and only marginally faster at 27.5 knots:

GB/CB/1909, Great Britain Battlecruiser laid down 1909

Displacement:
 26,817 t light; 27,945 t standard; 32,366 t normal; 35,903 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (703.00 ft / 695.00 ft) x 94.00 ft x (30.00 / 32.64 ft)
 (214.27 m / 211.84 m) x 28.65 m  x (9.14 / 9.95 m)

Armament:
      6 - 13.50" / 343 mm 45.0 cal guns - 1,240.67lbs / 562.76kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1909 Model
   3 x Twin mounts on centreline ends, majority forward
  1 raised mount - superfiring
      12 - 6.00" / 152 mm 45.0 cal guns - 108.93lbs / 49.41kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1909 Model
   12 x Single mounts on sides, forward deck aft
      Weight of broadside 8,751 lbs / 3,969 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 455.00 ft / 138.68 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 10.0" / 254 mm 455.00 ft / 138.68 m 8.00 ft / 2.44 m
   Main Belt covers 101 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
  2.00" / 51 mm 455.00 ft / 138.68 m 30.00 ft / 9.14 m
 Beam between torpedo bulkheads 62.00 ft / 18.90 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 9.00" / 229 mm  12.0" / 305 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Protected deck - multiple decks:
 For and Aft decks: 4.00" / 102 mm
 Forecastle: 4.00" / 102 mm  Quarter deck: 4.00" / 102 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 96,148 shp / 71,727 Kw = 27.50 kts
 Range 8,500nm at 16.00 kts
 Bunker at max displacement = 7,958 tons

Complement:
 1,206 - 1,568

Cost:
 £2.307 million / $9.226 million

Distribution of weights at normal displacement:
 Armament: 1,501 tons, 4.6 %
    - Guns: 1,501 tons, 4.6 %
 Armour: 10,858 tons, 33.5 %
    - Belts: 3,649 tons, 11.3 %
    - Torpedo bulkhead: 1,010 tons, 3.1 %
    - Armament: 2,256 tons, 7.0 %
    - Armour Deck: 3,484 tons, 10.8 %
    - Conning Towers: 459 tons, 1.4 %
 Machinery: 4,370 tons, 13.5 %
 Hull, fittings & equipment: 10,087 tons, 31.2 %
 Fuel, ammunition & stores: 5,549 tons, 17.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   57,968 lbs / 26,294 Kg = 47.1 x 13.5 " / 343 mm shells or 8.7 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 6.3 ft / 1.9 m
 Roll period: 15.7 seconds
 Steadiness - As gun platform (Average = 50 %): 75 %
   - Recoil effect (Restricted arc if above 1.00): 0.61
 Seaboat quality  (Average = 1.00): 1.50

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.578 / 0.589
 Length to Beam Ratio: 7.39 : 1
 'Natural speed' for length: 26.36 kts
 Power going to wave formation at top speed: 51 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 28.00 %,  30.00 ft / 9.14 m,  28.00 ft / 8.53 m
    - Forward deck: 30.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Aft deck: 9.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Quarter deck: 33.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Average freeboard:  25.58 ft / 7.80 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 99.7 %
  - Above water (accommodation/working, high = better): 207.0 %
 Waterplane Area: 46,807 Square feet or 4,349 Square metres
 Displacement factor (Displacement / loading): 121 %
 Structure weight / hull surface area: 168 lbs/sq ft or 822 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.63
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily

The GB/BB/1909 battleship design

This is a design that my friend Cliff had considered building as part of his program. It is just a 620ft long ship and has only 6-13.5in/45 and 12-6in QF guns. For a 29,000 ton ship (nominally), the ship is underarmed but well-protected, despite the belt being short. The real question is why the ship is as good as it is. I backed off coal-fired boilers as my photo is clearly an oil-fired ship, which is consistent with Cliff's plans. He often opted for speed and armour and sacrificed armament. Did I overlook something? In any case, here is the Springsharp report for those with sharp eyes to peruse:

GB/BB/1909, Great Britain Battleship laid down 1909

Displacement:
 23,901 t light; 24,964 t standard; 29,121 t normal; 32,447 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (628.00 ft / 620.00 ft) x 95.00 ft x (30.20 / 32.97 ft)
 (191.41 m / 188.98 m) x 28.96 m  x (9.20 / 10.05 m)

Armament:
      6 - 13.50" / 343 mm 45.0 cal guns - 1,240.67lbs / 562.76kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1909 Model
   3 x Twin mounts on centreline ends, majority forward
  1 raised mount - superfiring
      12 - 6.00" / 152 mm 45.0 cal guns - 108.93lbs / 49.41kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1909 Model
   12 x Single mounts on sides, forward deck aft
      Weight of broadside 8,751 lbs / 3,969 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.0" / 330 mm 385.00 ft / 117.35 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 10.0" / 254 mm 385.00 ft / 117.35 m 8.00 ft / 2.44 m
   Main Belt covers 96 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Strengthened structural bulkheads:
  2.00" / 51 mm 385.00 ft / 117.35 m 30.20 ft / 9.20 m
 Beam between torpedo bulkheads 62.00 ft / 18.90 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 9.00" / 229 mm  12.0" / 305 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Protected deck - multiple decks:
 For and Aft decks: 4.00" / 102 mm
 Forecastle: 4.00" / 102 mm  Quarter deck: 4.00" / 102 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 76,183 shp / 56,832 Kw = 26.00 kts
 Range 8,500nm at 16.00 kts
 Bunker at max displacement = 7,482 tons

Complement:
 1,114 - 1,449

Cost:
 £2.077 million / $8.310 million

Distribution of weights at normal displacement:
 Armament: 1,501 tons, 5.2 %
    - Guns: 1,501 tons, 5.2 %
 Armour: 9,945 tons, 34.1 %
    - Belts: 3,325 tons, 11.4 %
    - Torpedo bulkhead: 860 tons, 3.0 %
    - Armament: 2,204 tons, 7.6 %
    - Armour Deck: 3,126 tons, 10.7 %
    - Conning Towers: 428 tons, 1.5 %
 Machinery: 3,463 tons, 11.9 %
 Hull, fittings & equipment: 8,992 tons, 30.9 %
 Fuel, ammunition & stores: 5,220 tons, 17.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   54,031 lbs / 24,508 Kg = 43.9 x 13.5 " / 343 mm shells or 8.6 torpedoes
 Stability (Unstable if below 1.00): 1.22
 Metacentric height 6.7 ft / 2.0 m
 Roll period: 15.5 seconds
 Steadiness - As gun platform (Average = 50 %): 74 %
   - Recoil effect (Restricted arc if above 1.00): 0.57
 Seaboat quality  (Average = 1.00): 1.47

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.573 / 0.585
 Length to Beam Ratio: 6.53 : 1
 'Natural speed' for length: 24.90 kts
 Power going to wave formation at top speed: 53 %
 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 28.00 %,  29.00 ft / 8.84 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: 9.00 %,  27.00 ft / 8.23 m,  27.00 ft / 8.23 m
    - Quarter deck: 33.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
    - Average freeboard:  24.58 ft / 7.49 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 96.3 %
  - Above water (accommodation/working, high = better): 193.9 %
 Waterplane Area: 42,002 Square feet or 3,902 Square metres
 Displacement factor (Displacement / loading): 121 %
 Structure weight / hull surface area: 170 lbs/sq ft or 828 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.95
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily

A rather unsatisfactory Viper design

I am not sure if it is possible to achieve a good result for an 1898 destroyer in Springsharp. We are going with the very low, but realistic freeboard. This is my rather lame attempt at HMS Viper, the turbine destroyer:

Viper, Great Britain Torpedo Boat Destroyer laid down 1898 (Engine 1917)

Displacement:
 284 t light; 295 t standard; 333 t normal; 365 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (210.00 ft / 210.00 ft) x 21.00 ft x (7.25 / 7.66 ft)
 (64.01 m / 64.01 m) x 6.40 m  x (2.21 / 2.33 m)

Armament:
      1 - 3.00" / 76.2 mm 45.0 cal gun - 13.62lbs / 6.18kg shells, 150 per gun
   Quick firing gun in deck mounts, 1898 Model
   2 x Single mounts on centreline, forward deck forward
  1 raised mount - superfiring
      5 - 2.24" / 57.0 mm 45.0 cal guns - 5.70lbs / 2.58kg shells, 150 per gun
   Quick firing guns in deck mounts, 1898 Model
   4 x Single mounts on sides, forward deck aft
   1 x Single mount on centreline, aft deck aft
      Weight of broadside 42 lbs / 19 kg
      Main Torpedoes
      2 - 17.7" / 450 mm, 20.00 ft / 6.10 m torpedoes - 0.650 t each, 1.300 t total
 In 2 sets of deck mounted centre rotating tubes

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 2 shafts, 11,992 shp / 8,946 Kw = 30.00 kts
 Range 2,200nm at 12.00 kts
 Bunker at max displacement = 70 tons (100% coal)
   Caution: Delicate, lightweight machinery

Complement:
 38 - 50

Cost:
 £0.038 million / $0.153 million

Distribution of weights at normal displacement:
 Armament: 11 tons, 3.3 %
    - Guns: 8 tons, 2.5 %
    - Weapons: 3 tons, 0.8 %
 Machinery: 186 tons, 55.7 %
 Hull, fittings & equipment: 87 tons, 26.2 %
 Fuel, ammunition & stores: 49 tons, 14.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   69 lbs / 31 Kg = 5.1 x 3.0 " / 76 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.06
 Metacentric height 0.5 ft / 0.2 m
 Roll period: 12.0 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.18
 Seaboat quality  (Average = 1.00): 0.51

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a round stern
 Block coefficient (normal/deep): 0.365 / 0.378
 Length to Beam Ratio: 10.00 : 1
 'Natural speed' for length: 14.49 kts
 Power going to wave formation at top speed: 71 %
 Trim (Max stability = 0, Max steadiness = 100): 100
 Bow angle (Positive = bow angles forward): 0.00 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 %,  9.00 ft / 2.74 m,  8.00 ft / 2.44 m
    - Forward deck: 30.00 %,  8.00 ft / 2.44 m,  7.00 ft / 2.13 m
    - Aft deck: 35.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
    - Quarter deck: 15.00 %,  7.00 ft / 2.13 m,  7.00 ft / 2.13 m
    - Average freeboard:  7.43 ft / 2.26 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 186.5 %
  - Above water (accommodation/working, high = better): 65.7 %
 Waterplane Area: 2,654 Square feet or 247 Square metres
 Displacement factor (Displacement / loading): 34 %
 Structure weight / hull surface area: 21 lbs/sq ft or 100 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.48
  - Longitudinal: 1.19
  - Overall: 0.53
 Cramped machinery, storage, compartmentation space
 Cramped accommodation and workspace room
 Caution: Lacks seaworthiness - very limited seakeeping ability

HMS Viper

When I first saw the photograph of the torpedo boat destroyer HMS Viper making 36 knots on trials in Marsh's book, it really captured my imagination. When I was in Minnesota in 2003, I painted this picture, based on the photograph, as I thought it would be colored. This is a slightly edited version of the painting.

A new GB/CB/1905 photograph

This photograph is a departure for me. It did not originate with a photograph that I edited but with a drawing that is posted to KentishKnock.com. The drawing originated from a pencil drawing that I originally did in May 2001. I did graphic editing on the drawing later. I took that drawing, which shows the ship in perspective and "flattened" it. I used the GIMP and the pespective transformation along with some further editing. I have a new design to go with the photograph. The photograph is scaled from my only surviving pencil drawing, dating from the early 1970's. The original only had 4in side armour, because we assumed that it would be necessary to obtain a 33 knot speed. This design shows that with the same armour coverage as the original drawing, that the side armour can be upgraded to 6in thickness:

GB/CB/1905 Uparmoured, Great Britain Battlecruiser laid down 1905 (Engine 1908)

Displacement:
 24,410 t light; 25,246 t standard; 29,225 t normal; 32,408 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (776.00 ft / 770.00 ft) x 80.00 ft x (27.00 / 29.44 ft)
 (236.52 m / 234.70 m) x 24.38 m  x (8.23 / 8.97 m)

Armament:
      4 - 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
   2 x Twin mounts on centreline ends, evenly spread
      9 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1905 Model
   8 x Single mounts on sides, evenly spread
   1 x Single mount on centreline, aft deck forward
  1 raised mount
      Weight of broadside 4,380 lbs / 1,987 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 470.00 ft / 143.26 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 6.00" / 152 mm 340.00 ft / 103.63 m 8.00 ft / 2.44 m
   Main Belt covers 94 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.00" / 25 mm 555.00 ft / 169.16 m 27.00 ft / 8.23 m
 Beam between torpedo bulkheads 56.00 ft / 17.07 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 3.00" / 76 mm  4.00" / 102 mm

   - Protected deck - single deck:
 For and Aft decks: 2.00" / 51 mm
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 8.00" / 203 mm, Aft 5.00" / 127 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 176,160 shp / 131,415 Kw = 33.00 kts
 Range 5,800nm at 18.00 kts
 Bunker at max displacement = 7,162 tons

Complement:
 1,116 - 1,452

Cost:
 £2.518 million / $10.072 million

Distribution of weights at normal displacement:
 Armament: 880 tons, 3.0 %
    - Guns: 880 tons, 3.0 %
 Armour: 5,227 tons, 17.9 %
    - Belts: 1,790 tons, 6.1 %
    - Torpedo bulkhead: 554 tons, 1.9 %
    - Armament: 915 tons, 3.1 %
    - Armour Deck: 1,703 tons, 5.8 %
    - Conning Towers: 266 tons, 0.9 %
 Machinery: 8,897 tons, 30.4 %
 Hull, fittings & equipment: 9,406 tons, 32.2 %
 Fuel, ammunition & stores: 4,815 tons, 16.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   28,878 lbs / 13,099 Kg = 33.4 x 12.0 " / 305 mm shells or 3.0 torpedoes
 Stability (Unstable if below 1.00): 1.28
 Metacentric height 5.6 ft / 1.7 m
 Roll period: 14.2 seconds
 Steadiness - As gun platform (Average = 50 %): 57 %
   - Recoil effect (Restricted arc if above 1.00): 0.39
 Seaboat quality  (Average = 1.00): 1.15

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.615 / 0.625
 Length to Beam Ratio: 9.63 : 1
 'Natural speed' for length: 27.75 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 (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  30.00 ft / 9.14 m,  28.00 ft / 8.53 m
    - Forward deck: 30.00 %,  28.00 ft / 8.53 m,  26.00 ft / 7.92 m
    - Aft deck: 25.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 25.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  24.86 ft / 7.58 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 159.7 %
  - Above water (accommodation/working, high = better): 207.0 %
 Waterplane Area: 45,688 Square feet or 4,245 Square metres
 Displacement factor (Displacement / loading): 108 %
 Structure weight / hull surface area: 139 lbs/sq ft or 681 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.99
  - Longitudinal: 1.12
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

The GB/CA/1921 New Armoured Cruiser (Updated)

This is my current concept for a British 1921-style armoured cruiser. Since the battlecruisers will be carrying larger guns, the armoured cruiser can use the 12in/50 gun. This is the updated Springsharp report which includes a range, which had been inadvertently omitted:

GB/CA/1921 New, Great Britain Armoured Cruiser laid down 1921 (Engine 1927)

Displacement:
 26,936 t light; 28,084 t standard; 29,813 t normal; 31,196 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (770.82 ft / 765.00 ft) x 87.00 ft x (26.00 / 26.97 ft)
 (234.95 m / 233.17 m) x 26.52 m  x (7.92 / 8.22 m)

Armament:
      9 - 12.00" / 305 mm 50.0 cal guns - 915.01lbs / 415.04kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1921 Model
   3 x Triple mounts on centreline ends, majority forward
  1 raised mount - superfiring
      16 - 5.50" / 140 mm 50.0 cal guns - 85.01lbs / 38.56kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1921 Model
   8 x Twin mounts on sides, forward deck aft
      6 - 4.70" / 119 mm 45.0 cal guns - 52.36lbs / 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 9,909 lbs / 4,495 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 9.00" / 229 mm 520.00 ft / 158.50 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 7.00" / 178 mm 520.00 ft / 158.50 m 8.00 ft / 2.44 m
   Main Belt covers 105 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 520.00 ft / 158.50 m 26.00 ft / 7.92 m
 Beam between torpedo bulkheads 55.00 ft / 16.76 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: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

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

   - Conning towers: Forward 9.00" / 229 mm, Aft 7.00" / 178 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 167,706 shp / 125,109 Kw = 33.00 kts
 Range 5,400nm at 16.00 kts
 Bunker at max displacement = 3,112 tons

Complement:
 1,133 - 1,474

Cost:
 £6.914 million / $27.655 million

Distribution of weights at normal displacement:
 Armament: 2,070 tons, 6.9 %
    - Guns: 2,070 tons, 6.9 %
 Armour: 7,938 tons, 26.6 %
    - Belts: 2,770 tons, 9.3 %
    - Torpedo bulkhead: 750 tons, 2.5 %
    - Armament: 2,220 tons, 7.4 %
    - Armour Deck: 1,867 tons, 6.3 %
    - Conning Towers: 331 tons, 1.1 %
 Machinery: 5,294 tons, 17.8 %
 Hull, fittings & equipment: 11,634 tons, 39.0 %
 Fuel, ammunition & stores: 2,876 tons, 9.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   38,164 lbs / 17,311 Kg = 44.2 x 12.0 " / 305 mm shells or 4.7 torpedoes
 Stability (Unstable if below 1.00): 1.07
 Metacentric height 4.6 ft / 1.4 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.77
 Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and small transom stern
 Block coefficient (normal/deep): 0.603 / 0.608
 Length to Beam Ratio: 8.79 : 1
 'Natural speed' for length: 29.66 kts
 Power going to wave formation at top speed: 56 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 10.00 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 %,  33.00 ft / 10.06 m,  28.00 ft / 8.53 m
    - Forward deck: 30.00 %,  28.00 ft / 8.53 m,  24.00 ft / 7.32 m
    - Aft deck: 35.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Quarter deck: 15.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Average freeboard:  25.80 ft / 7.86 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 140.5 %
  - Above water (accommodation/working, high = better): 209.7 %
 Waterplane Area: 50,052 Square feet or 4,650 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 171 lbs/sq ft or 835 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.19
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

My Ger/BB/1905 Flush Decked picture is getting better

I have done more work on my photograph of a Ger/BB/1905 Flush-Decked battleship. This was a concept that I had in the early 1970's for a German ship with 8-12in/45 and 12-6in QF guns.

The GB/CB/1916 with a long belt

With a long belt, the GB/CB/1916 can still make 34 knots. The original concept for the design was to use a very short armour belt so as to make the maximum speed. This is a version with a longer belt (110% of normal). This is the Springsharp report:

GB/CB/1916 Protected, Great Britain Battlecruiser laid down 1916 (Engine 1921)

Displacement:
 42,841 t light; 44,542 t standard; 46,914 t normal; 48,811 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (862.86 ft / 855.00 ft) x 105.00 ft x (31.00 / 32.02 ft)
 (263.00 m / 260.60 m) x 32.00 m  x (9.45 / 9.76 m)

Armament:
      6 - 16.50" / 419 mm 45.0 cal guns - 2,265.01lbs / 1,027.39kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1916 Model
   2 x Triple mounts on centreline, forward deck forward
  1 raised mount - superfiring
      10 - 6.00" / 152 mm 45.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1916 Model
   10 x Single mounts on sides, forward deck aft
  2 raised mounts - superfiring
      Weight of broadside 14,590 lbs / 6,618 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 610.00 ft / 185.93 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 610.00 ft / 185.93 m 8.00 ft / 2.44 m
   Main Belt covers 110 % of normal length
   Main belt does not fully cover magazines and engineering spaces
   Main Belt inclined -12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 610.00 ft / 185.93 m 31.00 ft / 9.45 m
 Beam between torpedo bulkheads 64.00 ft / 19.51 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 8.00" / 203 mm  12.0" / 305 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

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

   - Conning towers: Forward 12.00" / 305 mm, Aft 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 259,314 shp / 193,448 Kw = 34.00 kts
 Range 5,400nm at 16.00 kts
 Bunker at max displacement = 4,269 tons

Complement:
 1,593 - 2,071

Cost:
 £6.740 million / $26.962 million

Distribution of weights at normal displacement:
 Armament: 2,467 tons, 5.3 %
    - Guns: 2,467 tons, 5.3 %
 Armour: 12,455 tons, 26.5 %
    - Belts: 4,052 tons, 8.6 %
    - Torpedo bulkhead: 1,399 tons, 3.0 %
    - Armament: 2,808 tons, 6.0 %
    - Armour Deck: 3,635 tons, 7.7 %
    - Conning Towers: 560 tons, 1.2 %
 Machinery: 8,930 tons, 19.0 %
 Hull, fittings & equipment: 18,989 tons, 40.5 %
 Fuel, ammunition & stores: 4,073 tons, 8.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   62,606 lbs / 28,398 Kg = 27.9 x 16.5 " / 419 mm shells or 7.7 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 6.8 ft / 2.1 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.71
 Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
 Hull has low quarterdeck ,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.590 / 0.594
 Length to Beam Ratio: 8.14 : 1
 'Natural speed' for length: 29.24 kts
 Power going to wave formation at top speed: 56 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 12.00 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 %,  37.00 ft / 11.28 m,  32.00 ft / 9.75 m
    - Forward deck: 30.00 %,  32.00 ft / 9.75 m,  30.00 ft / 9.14 m
    - Aft deck: 22.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Quarter deck: 28.00 %,  22.00 ft / 6.71 m,  23.00 ft / 7.01 m
    - Average freeboard:  29.00 ft / 8.84 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 144.8 %
  - Above water (accommodation/working, high = better): 237.8 %
 Waterplane Area: 65,049 Square feet or 6,043 Square metres
 Displacement factor (Displacement / loading): 108 %
 Structure weight / hull surface area: 209 lbs/sq ft or 1,020 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.41
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

A GB/CB/1916 design with better protection

This design is to answer the question about how fast a GB/CB/1916 design ship could be with 12in armour. This is the Springsharp report:

GB/CB/1916 Protected, Great Britain Battlecruiser laid down 1916 (Engine 1921)

Displacement:
 42,991 t light; 44,696 t standard; 47,073 t normal; 48,975 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (862.86 ft / 855.00 ft) x 105.00 ft x (31.00 / 32.02 ft)
 (263.00 m / 260.60 m) x 32.00 m  x (9.45 / 9.76 m)

Armament:
      6 - 16.50" / 419 mm 45.0 cal guns - 2,265.00lbs / 1,027.39kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1916 Model
   2 x Triple mounts on centreline, forward deck forward
  1 raised mount - superfiring
      10 - 6.00" / 152 mm 45.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1916 Model
   10 x Single mounts on sides, forward deck aft
  2 raised mounts - superfiring
      Weight of broadside 14,590 lbs / 6,618 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 485.00 ft / 147.83 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 485.00 ft / 147.83 m 8.00 ft / 2.44 m
   Main Belt covers 87 % of normal length
   Main belt does not fully cover magazines and engineering spaces
   Main Belt inclined -12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 485.00 ft / 147.83 m 31.00 ft / 9.45 m
 Beam between torpedo bulkheads 64.00 ft / 19.51 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 8.00" / 203 mm  12.0" / 305 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

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

   - Conning towers: Forward 12.00" / 305 mm, Aft 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 292,552 shp / 218,244 Kw = 35.00 kts
 Range 5,400nm at 16.00 kts
 Bunker at max displacement = 4,279 tons

Complement:
 1,597 - 2,077

Cost:
 £7.011 million / $28.045 million

Distribution of weights at normal displacement:
 Armament: 2,467 tons, 5.2 %
    - Guns: 2,467 tons, 5.2 %
 Armour: 11,486 tons, 24.4 %
    - Belts: 3,362 tons, 7.1 %
    - Torpedo bulkhead: 1,113 tons, 2.4 %
    - Armament: 2,808 tons, 6.0 %
    - Armour Deck: 3,642 tons, 7.7 %
    - Conning Towers: 562 tons, 1.2 %
 Machinery: 10,074 tons, 21.4 %
 Hull, fittings & equipment: 18,964 tons, 40.3 %
 Fuel, ammunition & stores: 4,082 tons, 8.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   57,998 lbs / 26,307 Kg = 25.8 x 16.5 " / 419 mm shells or 6.6 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 6.9 ft / 2.1 m
 Roll period: 16.7 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.68
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has low quarterdeck ,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.592 / 0.596
 Length to Beam Ratio: 8.14 : 1
 'Natural speed' for length: 29.24 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 12.00 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 %,  37.00 ft / 11.28 m,  32.00 ft / 9.75 m
    - Forward deck: 30.00 %,  32.00 ft / 9.75 m,  30.00 ft / 9.14 m
    - Aft deck: 22.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Quarter deck: 28.00 %,  22.00 ft / 6.71 m,  23.00 ft / 7.01 m
    - Average freeboard:  29.00 ft / 8.84 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 157.1 %
  - Above water (accommodation/working, high = better): 237.7 %
 Waterplane Area: 65,170 Square feet or 6,055 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 208 lbs/sq ft or 1,017 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.39
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room