A better Ger/BB/1905 (yes, that was the designation)

My original concept was that this ship would be designated the Ger/BB/1905, although I have had second thoughts about that. That is why I did the Ger/BB/1906 Springsharp design. I just did some GIMP hacking on the picture, in hopes of making it better.

The next step

The next step in this design sequence is likely to be a somewhat larger ship with a "1921-style" bridge structure, a pole foremast, and flatter, wider turrets. We would attempt to obtain an even higher speed. The secondary armament would likely be the same, to keep the weight down. The target speed would be 40 knots. Oh, and the main armament would be 6-17in/45 guns firing 2,850 pound shot.

A new GB/CB/1916 Fast battlecruiser concept

I had a concept that has been developing for a few days for a new British fast battlecruiser. As you can see, the photograph is derived from that for the Ger/CB/1912 design. I found that I can run Springsharp 3.0 Beta 3 at my desk, so I developed my initial cut at a design:

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

Displacement:
 42,316 t light; 43,995 t standard; 45,802 t normal; 47,248 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (885.86 ft / 878.00 ft) x 104.00 ft x (33.00 / 33.81 ft)
 (270.01 m / 267.61 m) x 31.70 m  x (10.06 / 10.30 m)

Armament:
      6 - 16.50" / 419 mm 45.0 cal guns - 2,265.21lbs / 1,027.48kg 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 14,591 lbs / 6,618 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 480.00 ft / 146.30 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 84 % 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 480.00 ft / 146.30 m 33.00 ft / 10.06 m
 Beam between torpedo bulkheads 74.00 ft / 22.56 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 6.00" / 152 mm  8.00" / 203 mm
 2nd: 4.00" / 102 mm 3.00" / 76 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 8.00" / 203 mm, Aft 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 6 shafts, 383,549 shp / 286,127 Kw = 38.00 kts
 Range 4,800nm at 15.00 kts
 Bunker at max displacement = 3,253 tons

Complement:
 1,565 - 2,035

Cost:
 £7.601 million / $30.406 million

Distribution of weights at normal displacement:
 Armament: 2,467 tons, 5.4 %
    - Guns: 2,467 tons, 5.4 %
 Armour: 7,463 tons, 16.3 %
    - Belts: 1,495 tons, 3.3 %
    - Torpedo bulkhead: 1,172 tons, 2.6 %
    - Armament: 2,075 tons, 4.5 %
    - Armour Deck: 2,334 tons, 5.1 %
    - Conning Towers: 386 tons, 0.8 %
 Machinery: 12,819 tons, 28.0 %
 Hull, fittings & equipment: 19,567 tons, 42.7 %
 Fuel, ammunition & stores: 3,486 tons, 7.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   41,045 lbs / 18,618 Kg = 18.3 x 16.5 " / 419 mm shells or 4.4 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 7.0 ft / 2.1 m
 Roll period: 16.5 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.75
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has low quarterdeck ,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.532 / 0.536
 Length to Beam Ratio: 8.44 : 1
 'Natural speed' for length: 29.63 kts
 Power going to wave formation at top speed: 59 %
 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,  34.00 ft / 10.36 m
    - Forward deck: 30.00 %,  34.00 ft / 10.36 m,  33.00 ft / 10.06 m
    - Aft deck: 22.00 %,  33.00 ft / 10.06 m,  33.00 ft / 10.06 m
    - Quarter deck: 28.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Average freeboard:  31.35 ft / 9.56 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 165.1 %
  - Above water (accommodation/working, high = better): 253.9 %
 Waterplane Area: 62,662 Square feet or 5,822 Square metres
 Displacement factor (Displacement / loading): 99 %
 Structure weight / hull surface area: 212 lbs/sq ft or 1,035 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

I still like the Ger/CB/1912 photograph

I am using this picture as the desktop background on my work laptop. I had forgotten how much I like the picture.

A tweaked version of the Ger/BB/1906 photo

This is a slightly updated version of the Ger/BB/1906 (or is it 1905?) photo.

Oops, the Ger/BB/1906 with coal on board

I reader pointed out that I had neglected to give the Ger/BB/1906 battleship design a range and the associated coal in bunkers. Last night, I reran Springsharp to correct the problem:

Ger/BB/1906, Germany Battleship laid down 1906

Displacement:
 17,607 t light; 18,485 t standard; 21,014 t normal; 23,038 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (489.00 ft / 489.00 ft) x 89.00 ft x (26.00 / 28.12 ft)
 (149.05 m / 149.05 m) x 27.13 m  x (7.92 / 8.57 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.38lbs / 395.25kg 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 - 6.00" / 152 mm 45.0 cal guns - 108.93lbs / 49.41kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1906 Model
   12 x Single mounts on sides, evenly spread
      Weight of broadside 8,278 lbs / 3,755 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 325.00 ft / 99.06 m 8.00 ft / 2.44 m
 Ends: 5.00" / 127 mm 164.00 ft / 49.99 m 12.00 ft / 3.66 m
 Upper: 8.00" / 203 mm 325.00 ft / 99.06 m 8.00 ft / 2.44 m
   Main Belt covers 102 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 320.00 ft / 97.54 m 26.00 ft / 7.92 m
 Beam between torpedo bulkheads 59.00 ft / 17.98 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: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm

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

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

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 30,859 shp / 23,021 Kw = 21.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 4,553 tons (100% coal)

Complement:
 872 - 1,134

Cost:
 £1.637 million / $6.549 million

Distribution of weights at normal displacement:
 Armament: 1,462 tons, 7.0 %
    - Guns: 1,462 tons, 7.0 %
 Armour: 7,294 tons, 34.7 %
    - Belts: 2,691 tons, 12.8 %
    - Torpedo bulkhead: 462 tons, 2.2 %
    - Armament: 2,112 tons, 10.1 %
    - Armour Deck: 1,701 tons, 8.1 %
    - Conning Towers: 328 tons, 1.6 %
 Machinery: 2,204 tons, 10.5 %
 Hull, fittings & equipment: 6,647 tons, 31.6 %
 Fuel, ammunition & stores: 3,407 tons, 16.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   33,257 lbs / 15,085 Kg = 38.5 x 12.0 " / 305 mm shells or 5.7 torpedoes
 Stability (Unstable if below 1.00): 1.23
 Metacentric height 6.1 ft / 1.9 m
 Roll period: 15.1 seconds
 Steadiness - As gun platform (Average = 50 %): 68 %
   - Recoil effect (Restricted arc if above 1.00): 0.53
 Seaboat quality  (Average = 1.00): 1.35

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.650 / 0.659
 Length to Beam Ratio: 5.49 : 1
 'Natural speed' for length: 22.11 kts
 Power going to wave formation at top speed: 52 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: -3.00 ft / -0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  24.00 ft / 7.32 m,  21.00 ft / 6.40 m
    - Forward deck: 30.00 %,  21.00 ft / 6.40 m,  19.00 ft / 5.79 m
    - Aft deck: 25.00 %,  19.00 ft / 5.79 m,  18.00 ft / 5.49 m
    - Quarter deck: 20.00 %,  18.00 ft / 5.49 m,  17.50 ft / 5.33 m
    - Average freeboard:  19.73 ft / 6.01 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 98.7 %
  - Above water (accommodation/working, high = better): 140.7 %
 Waterplane Area: 33,340 Square feet or 3,097 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 159 lbs/sq ft or 774 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.85
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

Why does this look so good? The Ger/BB/1906 design

The flush-decked, imaginery German battleship Ger/BB/1906 is still one of my favorite designs. I just tried the ship in Springsharp and I was surprised how good the ship is:

Ger/BB/1906, Germany Battleship laid down 1906

Displacement:
 17,273 t light; 18,095 t standard; 18,186 t normal; 18,258 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (489.00 ft / 489.00 ft) x 89.00 ft x (25.00 / 25.08 ft)
 (149.05 m / 149.05 m) x 27.13 m  x (7.62 / 7.64 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg 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 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1906 Model
   12 x Single mounts on sides, evenly spread
      Weight of broadside 8,278 lbs / 3,755 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 325.00 ft / 99.06 m 8.00 ft / 2.44 m
 Ends: 5.00" / 127 mm 164.00 ft / 49.99 m 12.00 ft / 3.66 m
 Upper: 8.00" / 203 mm 325.00 ft / 99.06 m 8.00 ft / 2.44 m
   Main Belt covers 102 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 320.00 ft / 97.54 m 25.00 ft / 7.62 m
 Beam between torpedo bulkheads 59.00 ft / 17.98 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: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm

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

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

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 27,560 shp / 20,560 Kw = 21.00 kts
 Range 0nm at 15.00 kts
 Bunker at max displacement = 164 tons (100% coal)

Complement:
 782 - 1,017

Cost:
 £1.593 million / $6.370 million

Distribution of weights at normal displacement:
 Armament: 1,462 tons, 8.0 %
    - Guns: 1,462 tons, 8.0 %
 Armour: 7,192 tons, 39.5 %
    - Belts: 2,678 tons, 14.7 %
    - Torpedo bulkhead: 444 tons, 2.4 %
    - Armament: 2,173 tons, 11.9 %
    - Armour Deck: 1,600 tons, 8.8 %
    - Conning Towers: 298 tons, 1.6 %
 Machinery: 1,969 tons, 10.8 %
 Hull, fittings & equipment: 6,651 tons, 36.6 %
 Fuel, ammunition & stores: 912 tons, 5.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   27,378 lbs / 12,418 Kg = 31.7 x 12.0 " / 305 mm shells or 4.8 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 5.5 ft / 1.7 m
 Roll period: 16.0 seconds
 Steadiness - As gun platform (Average = 50 %): 71 %
   - Recoil effect (Restricted arc if above 1.00): 0.63
 Seaboat quality  (Average = 1.00): 1.43

Hull form characteristics:
 Hull has a flush deck,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.585 / 0.585
 Length to Beam Ratio: 5.49 : 1
 'Natural speed' for length: 22.11 kts
 Power going to wave formation at top speed: 50 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: -3.00 ft / -0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 25.00 %,  25.00 ft / 7.62 m,  22.00 ft / 6.71 m
    - Forward deck: 30.00 %,  22.00 ft / 6.71 m,  20.00 ft / 6.10 m
    - Aft deck: 25.00 %,  20.00 ft / 6.10 m,  19.00 ft / 5.79 m
    - Quarter deck: 20.00 %,  19.00 ft / 5.79 m,  18.50 ft / 5.64 m
    - Average freeboard:  20.73 ft / 6.32 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 107.3 %
  - Above water (accommodation/working, high = better): 155.3 %
 Waterplane Area: 31,387 Square feet or 2,916 Square metres
 Displacement factor (Displacement / loading): 102 %
 Structure weight / hull surface area: 166 lbs/sq ft or 812 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.00
  - 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

My 1905 British fast battleship

Instead of building 21 knot battleships and 25 knot armoured cruisers, why not just build 24 knot fast battleships? That is the premise of my GB/BB/1905 design that has 8-12in/45 and 16-4in QF guns and a 11in belt. "Just for fun," I have a photograph of one, as well! This is the Springsharp report:

GB/BB/1905, Great Britain Battleship laid down 1905 (Engine 1909)

Displacement:
 19,173 t light; 20,005 t standard; 22,462 t normal; 24,429 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (613.00 ft / 605.00 ft) x 84.00 ft x (26.00 / 27.86 ft)
 (186.84 m / 184.40 m) x 25.60 m  x (7.92 / 8.49 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 849.99lbs / 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
      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, 1905 Model
   16 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 7,312 lbs / 3,317 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 11.0" / 279 mm 400.00 ft / 121.92 m 9.00 ft / 2.74 m
 Ends: 4.00" / 102 mm 180.00 ft / 54.86 m 12.00 ft / 3.66 m
   25.00 ft / 7.62 m Unarmoured ends
 Upper: 8.00" / 203 mm 400.00 ft / 121.92 m 8.00 ft / 2.44 m
   Main Belt covers 102 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
  1.50" / 38 mm 400.00 ft / 121.92 m 27.00 ft / 8.23 m
 Beam between torpedo bulkheads 58.00 ft / 17.68 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 11.0" / 279 mm 8.00" / 203 mm  11.0" / 279 mm
 2nd: 4.00" / 102 mm 3.00" / 76 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 11.00" / 279 mm, Aft 8.00" / 203 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 47,823 shp / 35,676 Kw = 24.00 kts
 Range 4,800nm at 15.00 kts
 Bunker at max displacement = 4,424 tons (100% coal)

Complement:
 916 - 1,192

Cost:
 £1.706 million / $6.826 million

Distribution of weights at normal displacement:
 Armament: 1,382 tons, 6.2 %
    - Guns: 1,382 tons, 6.2 %
 Armour: 7,774 tons, 34.6 %
    - Belts: 3,108 tons, 13.8 %
    - Torpedo bulkhead: 599 tons, 2.7 %
    - Armament: 2,362 tons, 10.5 %
    - Armour Deck: 1,378 tons, 6.1 %
    - Conning Towers: 326 tons, 1.5 %
 Machinery: 2,391 tons, 10.6 %
 Hull, fittings & equipment: 7,626 tons, 33.9 %
 Fuel, ammunition & stores: 3,290 tons, 14.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   39,707 lbs / 18,011 Kg = 46.0 x 12.0 " / 305 mm shells or 6.4 torpedoes
 Stability (Unstable if below 1.00): 1.06
 Metacentric height 4.3 ft / 1.3 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 76 %
   - Recoil effect (Restricted arc if above 1.00): 0.90
 Seaboat quality  (Average = 1.00): 1.51

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.595 / 0.604
 Length to Beam Ratio: 7.20 : 1
 'Natural speed' for length: 24.60 kts
 Power going to wave formation at top speed: 48 %
 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: 20.00 %,  27.00 ft / 8.23 m,  25.00 ft / 7.62 m
    - Forward deck: 30.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Aft deck: 22.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Quarter deck: 28.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Average freeboard:  22.92 ft / 6.99 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 91.5 %
  - Above water (accommodation/working, high = better): 192.3 %
 Waterplane Area: 36,996 Square feet or 3,437 Square metres
 Displacement factor (Displacement / loading): 117 %
 Structure weight / hull surface area: 161 lbs/sq ft or 788 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.57
  - Overall: 1.00
 Adequate 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

My idea of the Hood as it might have been built: GB/CB/1915

The basis for the original Hood concept in 1915 has always interested me. Here is another attempt at such a ship: the GB/CB/1915 design with 8-15in/42 BLR, 16-5.5in QF, an armour basis of 8in and a speed of 32 knots. This is the Springsharp report:

GB/CB/1915, Great Britain Battlecruiser laid down 1915 (Engine 1919)

Displacement:
 41,011 t light; 43,359 t standard; 46,714 t normal; 49,398 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (860.06 ft / 855.00 ft) x 105.00 ft x (29.00 / 30.39 ft)
 (262.15 m / 260.60 m) x 32.00 m  x (8.84 / 9.26 m)

Armament:
      8 - 15.00" / 381 mm 42.0 cal guns - 1,950.00lbs / 884.51kg shells, 150 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
      16 - 5.50" / 140 mm 50.0 cal guns - 85.00lbs / 38.56kg 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 16,960 lbs / 7,693 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 600.00 ft / 182.88 m 17.00 ft / 5.18 m
 Ends: 4.00" / 102 mm 255.00 ft / 77.72 m 12.00 ft / 3.66 m
   Main Belt covers 108 % 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 600.00 ft / 182.88 m 29.00 ft / 8.84 m
 Beam between torpedo bulkheads 70.00 ft / 21.34 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 7.00" / 178 mm  10.0" / 254 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 10.00" / 254 mm, Aft 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 207,000 shp / 154,422 Kw = 32.00 kts
 Range 6,500nm at 17.00 kts
 Bunker at max displacement = 6,039 tons

Complement:
 1,588 - 2,065

Cost:
 £5.458 million / $21.830 million

Distribution of weights at normal displacement:
 Armament: 2,446 tons, 5.2 %
    - Guns: 2,446 tons, 5.2 %
 Armour: 12,626 tons, 27.0 %
    - Belts: 3,863 tons, 8.3 %
    - Torpedo bulkhead: 1,288 tons, 2.8 %
    - Armament: 3,209 tons, 6.9 %
    - Armour Deck: 3,764 tons, 8.1 %
    - Conning Towers: 503 tons, 1.1 %
 Machinery: 7,351 tons, 15.7 %
 Hull, fittings & equipment: 18,588 tons, 39.8 %
 Fuel, ammunition & stores: 5,703 tons, 12.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   73,288 lbs / 33,243 Kg = 43.4 x 15.0 " / 381 mm shells or 9.6 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 7.2 ft / 2.2 m
 Roll period: 16.5 seconds
 Steadiness - As gun platform (Average = 50 %): 58 %
   - Recoil effect (Restricted arc if above 1.00): 0.81
 Seaboat quality  (Average = 1.00): 1.17

Hull form characteristics:
 Hull has low quarterdeck ,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.628 / 0.634
 Length to Beam Ratio: 8.14 : 1
 'Natural speed' for length: 29.24 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: 28.00 %,  36.00 ft / 10.97 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: 14.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Quarter deck: 28.00 %,  20.00 ft / 6.10 m,  22.00 ft / 6.71 m
    - Average freeboard:  28.79 ft / 8.77 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 116.9 %
  - Above water (accommodation/working, high = better): 248.0 %
 Waterplane Area: 67,393 Square feet or 6,261 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 203 lbs/sq ft or 991 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.22
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

Another try at a Super Lion (GB/CB/1912)

This version of the Super Lion design is so good, there must be something wrong with the specification. This is a 30-knot battlecruiser with 10-15in/42 and 14-6in/50 QF guns, a 12in belt, 3in deck, and 7,500nm range:

GB/CB/1912 Super Lion, Great Britain Battlecruiser laid down 1912 (Engine 1918)

Displacement:
 41,153 t light; 43,216 t standard; 47,751 t normal; 51,378 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (823.00 ft / 815.00 ft) x 105.00 ft x (31.00 / 32.97 ft)
 (250.85 m / 248.41 m) x 32.00 m  x (9.45 / 10.05 m)

Armament:
      10 - 15.00" / 381 mm 42.0 cal guns - 1,950.00lbs / 884.51kg shells, 90 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
      14 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1912 Model
   14 x Single mounts on sides, evenly spread
  14 hull mounts in casemates- Limited use in heavy seas
      Weight of broadside 21,101 lbs / 9,571 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 525.00 ft / 160.02 m 9.00 ft / 2.74 m
 Ends: 5.00" / 127 mm 290.00 ft / 88.39 m 16.00 ft / 4.88 m
 Upper: 8.00" / 203 mm 525.00 ft / 160.02 m 8.00 ft / 2.44 m
   Main Belt covers 99 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 525.00 ft / 160.02 m 31.00 ft / 9.45 m
 Beam between torpedo bulkheads 72.00 ft / 21.95 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: 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 12.00" / 305 mm, Aft 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 165,755 shp / 123,653 Kw = 30.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 8,162 tons

Complement:
 1,614 - 2,099

Cost:
 £3.785 million / $15.142 million

Distribution of weights at normal displacement:
 Armament: 2,838 tons, 5.9 %
    - Guns: 2,838 tons, 5.9 %
 Armour: 14,193 tons, 29.7 %
    - Belts: 4,720 tons, 9.9 %
    - Torpedo bulkhead: 903 tons, 1.9 %
    - Armament: 4,407 tons, 9.2 %
    - Armour Deck: 3,596 tons, 7.5 %
    - Conning Towers: 567 tons, 1.2 %
 Machinery: 5,980 tons, 12.5 %
 Hull, fittings & equipment: 18,143 tons, 38.0 %
 Fuel, ammunition & stores: 6,598 tons, 13.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   77,044 lbs / 34,946 Kg = 45.7 x 15.0 " / 381 mm shells or 10.3 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 %): 61 %
   - Recoil effect (Restricted arc if above 1.00): 0.94
 Seaboat quality  (Average = 1.00): 1.21

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.630 / 0.637
 Length to Beam Ratio: 7.76 : 1
 'Natural speed' for length: 28.55 kts
 Power going to wave formation at top speed: 52 %
 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: 25.00 %,  31.00 ft / 9.45 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: 18.00 %,  29.00 ft / 8.84 m,  29.00 ft / 8.84 m
    - Quarter deck: 27.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
    - Average freeboard:  27.34 ft / 8.33 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 102.3 %
  - Above water (accommodation/working, high = better): 222.6 %
 Waterplane Area: 64,359 Square feet or 5,979 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 209 lbs/sq ft or 1,020 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.29
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

My attempt at an Italian armoured cruiser: It/CA/1897

I am interested in the Spanish cruiser Cristobal Colon, lost at the Battle of Santiago Bay in 1898. The Cristobal Colon was Italian-built along the lines of a series of armoured cruisers. My It/CA/1897 has 2-10in/45, 14-6in/50 QF, and 10-3in QF guns. The armour basis is 6in and the deck is 2in. The speed is a modest 20 knots. I struggled with the Springsharp 3.0 Beta 3, as I kept having "NaN" (not a number). The problem was that I had missed some settings. Once I had found all the places, then I had a workable design. I had to greatly increase the displacement and lighten the machinery for the power. This is the Springsharp report:

It/CA/1897, Italy Armoured Cruiser laid down 1897 (Engine 1904)

Displacement:
 8,028 t light; 8,405 t standard; 9,073 t normal; 9,608 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (354.00 ft / 345.00 ft) x 60.00 ft x (23.00 / 24.16 ft)
 (107.90 m / 105.16 m) x 18.29 m  x (7.01 / 7.36 m)

Armament:
      2 - 10.00" / 254 mm 45.0 cal guns - 504.26lbs / 228.73kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1897 Model
   2 x Single mounts on centreline ends, evenly spread
      14 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1897 Model
   10 x Single mounts on sides, evenly spread
  10 hull mounts in casemates- Limited use in all but light seas
   4 x Single mounts layout not set
      10 - 3.00" / 76.2 mm 45.0 cal guns - 13.62lbs / 6.18kg shells, 150 per gun
   Quick firing guns in deck mounts, 1897 Model
   10 x Single mounts on sides, evenly spread
  10 raised mounts
      Weight of broadside 2,745 lbs / 1,245 kg
      Main Torpedoes
      4 - 18.0" / 457 mm, 19.00 ft / 5.79 m torpedoes - 0.618 t each, 2.471 t total
 In 4 sets of deck mounted carriage/fixed tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 200.00 ft / 60.96 m 25.00 ft / 7.62 m
 Ends: 4.50" / 114 mm 145.00 ft / 44.20 m 9.00 ft / 2.74 m
   Main Belt covers 89 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.00" / 25 mm 200.00 ft / 60.96 m 23.00 ft / 7.01 m
 Beam between torpedo bulkheads 43.00 ft / 13.11 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm
 3rd: 1.00" / 25 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 6.00" / 152 mm, Aft 0.00" / 0 mm

Machinery:
 Coal fired boilers, complex reciprocating steam engines, 
 Direct drive, 2 shafts, 17,193 ihp / 12,826 Kw = 20.00 kts
 Range 3,500nm at 12.00 kts
 Bunker at max displacement = 1,203 tons (100% coal)

Complement:
 464 - 604

Cost:
 £0.820 million / $3.280 million

Distribution of weights at normal displacement:
 Armament: 612 tons, 6.7 %
    - Guns: 609 tons, 6.7 %
    - Weapons: 3 tons, 0.0 %
 Armour: 2,895 tons, 31.9 %
    - Belts: 1,602 tons, 17.7 %
    - Torpedo bulkhead: 170 tons, 1.9 %
    - Armament: 466 tons, 5.1 %
    - Armour Deck: 600 tons, 6.6 %
    - Conning Tower: 56 tons, 0.6 %
 Machinery: 2,528 tons, 27.9 %
 Hull, fittings & equipment: 1,993 tons, 22.0 %
 Fuel, ammunition & stores: 1,045 tons, 11.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   8,570 lbs / 3,887 Kg = 17.1 x 10.0 " / 254 mm shells or 3.0 torpedoes
 Stability (Unstable if below 1.00): 1.48
 Metacentric height 4.6 ft / 1.4 m
 Roll period: 11.8 seconds
 Steadiness - As gun platform (Average = 50 %): 71 %
   - Recoil effect (Restricted arc if above 1.00): 0.33
 Seaboat quality  (Average = 1.00): 1.33

Hull form characteristics:
 Hull has a flush deck,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.667 / 0.672
 Length to Beam Ratio: 5.75 : 1
 'Natural speed' for length: 18.57 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 53
 Bow angle (Positive = bow angles forward): -7.00 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 %,  19.00 ft / 5.79 m,  18.00 ft / 5.49 m
    - Forward deck: 30.00 %,  18.00 ft / 5.49 m,  17.00 ft / 5.18 m
    - Aft deck: 30.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Quarter deck: 20.00 %,  17.00 ft / 5.18 m,  18.00 ft / 5.49 m
    - Average freeboard:  17.53 ft / 5.34 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 153.3 %
  - Above water (accommodation/working, high = better): 113.2 %
 Waterplane Area: 16,105 Square feet or 1,496 Square metres
 Displacement factor (Displacement / loading): 93 %
 Structure weight / hull surface area: 96 lbs/sq ft or 469 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.90
  - Longitudinal: 2.63
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Adequate accommodation and workspace room
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily

GB/CA/1905 A2 Design

This is my GB/CA/1905 A2 armoured cruiser design. This is the sort of ship that would have been built if a dreadnought cruiser had not been built. My tweak was to not have superfiring 9.2in turrets on the beam, as they are not practical, in my view. This is the Springsharp report:

GB/CA/1905 A2 Design, Great Britain Armoured Cruiser laid down 1905 (Engine 1909)

Displacement:
 16,516 t light; 17,478 t standard; 20,663 t normal; 23,211 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (572.00 ft / 565.00 ft) x 80.00 ft x (25.00 / 27.60 ft)
 (174.35 m / 172.21 m) x 24.38 m  x (7.62 / 8.41 m)

Armament:
      16 - 9.20" / 234 mm 50.0 cal guns - 380.00lbs / 172.37kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1905 Model
   2 x Twin mounts on centreline ends, evenly spread
   6 x Twin mounts on sides, evenly spread
      16 - 4.00" / 102 mm 50.0 cal guns - 31.99lbs / 14.51kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1905 Model
   16 x Single mounts on sides, evenly spread
  16 raised mounts
      Weight of broadside 6,592 lbs / 2,990 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 350.00 ft / 106.68 m 16.00 ft / 4.88 m
 Ends: 4.00" / 102 mm 205.00 ft / 62.48 m 16.00 ft / 4.88 m
   10.00 ft / 3.05 m Unarmoured ends
   Main Belt covers 95 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 350.00 ft / 106.68 m 25.00 ft / 7.62 m
 Beam between torpedo bulkheads 48.00 ft / 14.63 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 5.00" / 127 mm  6.00" / 152 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 6.00" / 152 mm, Aft 5.00" / 127 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 60,277 shp / 44,967 Kw = 25.50 kts
 Range 5,600nm at 16.00 kts
 Bunker at max displacement = 5,732 tons (100% coal)

Complement:
 861 - 1,120

Cost:
 £1.715 million / $6.860 million

Distribution of weights at normal displacement:
 Armament: 1,740 tons, 8.4 %
    - Guns: 1,740 tons, 8.4 %
 Armour: 5,606 tons, 27.1 %
    - Belts: 1,954 tons, 9.5 %
    - Torpedo bulkhead: 486 tons, 2.4 %
    - Armament: 1,710 tons, 8.3 %
    - Armour Deck: 1,278 tons, 6.2 %
    - Conning Towers: 178 tons, 0.9 %
 Machinery: 3,014 tons, 14.6 %
 Hull, fittings & equipment: 6,155 tons, 29.8 %
 Fuel, ammunition & stores: 4,147 tons, 20.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   30,739 lbs / 13,943 Kg = 79.0 x 9.2 " / 234 mm shells or 4.2 torpedoes
 Stability (Unstable if below 1.00): 1.22
 Metacentric height 5.2 ft / 1.6 m
 Roll period: 14.8 seconds
 Steadiness - As gun platform (Average = 50 %): 61 %
   - Recoil effect (Restricted arc if above 1.00): 0.61
 Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.640 / 0.651
 Length to Beam Ratio: 7.06 : 1
 'Natural speed' for length: 23.77 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 51
 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: 25.00 %,  26.00 ft / 7.92 m,  24.00 ft / 7.32 m
    - Forward deck: 30.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Aft deck: 18.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Quarter deck: 27.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
    - Average freeboard:  22.04 ft / 6.72 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 132.6 %
  - Above water (accommodation/working, high = better): 182.2 %
 Waterplane Area: 34,309 Square feet or 3,187 Square metres
 Displacement factor (Displacement / loading): 112 %
 Structure weight / hull surface area: 141 lbs/sq ft or 687 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.46
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

My latest attempt at the Ger/CB/1906 design

This is my Ger/CB/1906 design that dates from 1971. The ship was a German battlecruiser of nominally 33 knots and 8-12in guns. The protection is light to achieve the speed with a decent armament. This is the Springsharp report:

Ger/CB/1906, Germany Battlecruiser laid down 1906 (Engine 1911)

Displacement:
 26,585 t light; 27,623 t standard; 30,688 t normal; 33,140 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (807.00 ft / 800.00 ft) x 85.00 ft x (25.60 / 27.30 ft)
 (245.97 m / 243.84 m) x 25.91 m  x (7.80 / 8.32 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg 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
      8 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1906 Model
   8 x Single mounts on sides, forward deck aft
      Weight of broadside 7,886 lbs / 3,577 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 450.00 ft / 137.16 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 87 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  1.50" / 38 mm 450.00 ft / 137.16 m 25.60 ft / 7.80 m
 Beam between torpedo bulkheads 58.00 ft / 17.68 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 6.00" / 152 mm  8.00" / 203 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Protected 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 6.00" / 152 mm, Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 175,979 shp / 131,281 Kw = 32.80 kts
 Range 6,500nm at 16.00 kts
 Bunker at max displacement = 5,517 tons

Complement:
 1,159 - 1,507

Cost:
 £2.677 million / $10.708 million

Distribution of weights at normal displacement:
 Armament: 1,509 tons, 4.9 %
    - Guns: 1,509 tons, 4.9 %
 Armour: 6,597 tons, 21.5 %
    - Belts: 1,305 tons, 4.3 %
    - Torpedo bulkhead: 639 tons, 2.1 %
    - Armament: 1,703 tons, 5.6 %
    - Armour Deck: 2,822 tons, 9.2 %
    - Conning Tower: 127 tons, 0.4 %
 Machinery: 7,142 tons, 23.3 %
 Hull, fittings & equipment: 11,337 tons, 36.9 %
 Fuel, ammunition & stores: 4,103 tons, 13.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   38,555 lbs / 17,488 Kg = 44.6 x 12.0 " / 305 mm shells or 4.1 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 5.2 ft / 1.6 m
 Roll period: 15.6 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.69
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.617 / 0.625
 Length to Beam Ratio: 9.41 : 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): -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: 27.00 %,  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: 14.00 %,  27.00 ft / 8.23 m,  27.00 ft / 8.23 m
    - Quarter deck: 29.00 %,  19.00 ft / 5.79 m,  20.00 ft / 6.10 m
    - Average freeboard:  25.04 ft / 7.63 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 143.0 %
  - Above water (accommodation/working, high = better): 224.2 %
 Waterplane Area: 50,528 Square feet or 4,694 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 160 lbs/sq ft or 781 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.00
  - Longitudinal: 1.02
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room

Another look at the British semi-Dreadnought: GB/BB/1903

The British almost built a class of battleships that were in the "semi-Dreadnought" category. They would have carried 4-12in and 12-9.2in guns. They were what the Lord Nelson and Agamenon should have been. This is the Springsharp report:

GB/BB/1903, Great Britain Battleship laid down 1903 (Engine 1908)

Displacement:
 18,189 t light; 19,180 t standard; 21,093 t normal; 22,623 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (483.00 ft / 475.00 ft) x 82.00 ft x (27.00 / 28.71 ft)
 (147.22 m / 144.78 m) x 24.99 m  x (8.23 / 8.75 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, 1903 Model
   2 x Twin mounts on centreline ends, evenly spread
      12 - 9.20" / 234 mm 50.0 cal guns - 380.00lbs / 172.37kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1903 Model
   6 x Twin mounts on sides, evenly spread
      16 - 3.00" / 76.2 mm 50.0 cal guns - 14.29lbs / 6.48kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1903 Model
   16 x Single mounts on sides, evenly spread
  16 raised mounts
      Weight of broadside 8,189 lbs / 3,714 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 315.00 ft / 96.01 m 9.00 ft / 2.74 m
 Ends: 5.00" / 127 mm 160.00 ft / 48.77 m 16.00 ft / 4.88 m
 Upper: 9.00" / 229 mm 315.00 ft / 96.01 m 8.00 ft / 2.44 m
   Main Belt covers 102 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 315.00 ft / 96.01 m 27.00 ft / 8.23 m
 Beam between torpedo bulkheads 58.00 ft / 17.68 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: 10.0" / 254 mm 7.00" / 178 mm  10.0" / 254 mm
 3rd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 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 9.00" / 229 mm

Machinery:
 Coal fired boilers, complex reciprocating steam engines, 
 Direct drive, 4 shafts, 21,257 ihp / 15,857 Kw = 19.00 kts
 Range 4,500nm at 14.00 kts
 Bunker at max displacement = 3,443 tons (100% coal)

Complement:
 874 - 1,137

Cost:
 £1.772 million / $7.089 million

Distribution of weights at normal displacement:
 Armament: 1,918 tons, 9.1 %
    - Guns: 1,918 tons, 9.1 %
 Armour: 8,378 tons, 39.7 %
    - Belts: 3,019 tons, 14.3 %
    - Torpedo bulkhead: 629 tons, 3.0 %
    - Armament: 2,635 tons, 12.5 %
    - Armour Deck: 1,749 tons, 8.3 %
    - Conning Towers: 345 tons, 1.6 %
 Machinery: 1,932 tons, 9.2 %
 Hull, fittings & equipment: 5,961 tons, 28.3 %
 Fuel, ammunition & stores: 2,904 tons, 13.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   30,266 lbs / 13,728 Kg = 35.0 x 12.0 " / 305 mm shells or 5.1 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 4.6 ft / 1.4 m
 Roll period: 16.1 seconds
 Steadiness - As gun platform (Average = 50 %): 79 %
   - Recoil effect (Restricted arc if above 1.00): 0.76
 Seaboat quality  (Average = 1.00): 1.59

Hull form characteristics:
 Hull has a flush deck,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.702 / 0.708
 Length to Beam Ratio: 5.79 : 1
 'Natural speed' for length: 21.79 kts
 Power going to wave formation at top speed: 48 %
 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: 20.00 %,  22.00 ft / 6.71 m,  21.00 ft / 6.40 m
    - Forward deck: 30.00 %,  21.00 ft / 6.40 m,  19.00 ft / 5.79 m
    - Aft deck: 30.00 %,  19.00 ft / 5.79 m,  20.00 ft / 6.10 m
    - Quarter deck: 20.00 %,  20.00 ft / 6.10 m,  21.00 ft / 6.40 m
    - Average freeboard:  20.23 ft / 6.17 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 95.4 %
  - Above water (accommodation/working, high = better): 134.6 %
 Waterplane Area: 31,275 Square feet or 2,906 Square metres
 Displacement factor (Displacement / loading): 103 %
 Structure weight / hull surface area: 154 lbs/sq ft or 752 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.93
  - Overall: 1.00
 Adequate 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

A well-protected battlecruiser: GB/CB/1905

I still do not see any reason why there could not be a well-protected British battlecruiser laid down in 1905. The ship has coal-fired boilers and direct-drive turbines. The belt is 10in and the deck in 3in. The four turrets are distributed on the centerline, with one forward and one aft. The 16-4in QF guns are stacked casemates with 4in protection. The speed is 25 knots. This is the Springsharp report:

GB/CB/1905, Great Britain Battlecruiser laid down 1905 (Engine 1909)

Displacement:
 20,474 t light; 21,583 t standard; 24,985 t normal; 27,707 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (642.00 ft / 634.00 ft) x 82.00 ft x (27.00 / 29.45 ft)
 (195.68 m / 193.24 m) x 24.99 m  x (8.23 / 8.98 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 850.00lbs / 385.55kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts, 1905 Model
   4 x Twin mounts on centreline, evenly spread
      16 - 4.00" / 102 mm 45.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Breech loading guns in casemate mounts, 1905 Model
   16 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 7,312 lbs / 3,317 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.0" / 254 mm 420.00 ft / 128.02 m 9.00 ft / 2.74 m
 Ends: 4.00" / 102 mm 114.00 ft / 34.75 m 12.00 ft / 3.66 m
   100.00 ft / 30.48 m Unarmoured ends
 Upper: 7.00" / 178 mm 420.00 ft / 128.02 m 8.00 ft / 2.44 m
   Main Belt covers 102 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 420.00 ft / 128.02 m 27.00 ft / 8.23 m
 Beam between torpedo bulkheads 62.00 ft / 18.90 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: 4.00" / 102 mm 4.00" / 102 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 10.00" / 254 mm, Aft 7.00" / 178 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 58,942 shp / 43,971 Kw = 25.00 kts
 Range 5,400nm at 16.00 kts
 Bunker at max displacement = 6,124 tons (100% coal)

Complement:
 993 - 1,291

Cost:
 £1.805 million / $7.219 million

Distribution of weights at normal displacement:
 Armament: 1,320 tons, 5.3 %
    - Guns: 1,320 tons, 5.3 %
 Armour: 8,087 tons, 32.4 %
    - Belts: 2,801 tons, 11.2 %
    - Torpedo bulkhead: 839 tons, 3.4 %
    - Armament: 1,964 tons, 7.9 %
    - Armour Deck: 2,170 tons, 8.7 %
    - Conning Towers: 313 tons, 1.3 %
 Machinery: 2,947 tons, 11.8 %
 Hull, fittings & equipment: 8,119 tons, 32.5 %
 Fuel, ammunition & stores: 4,511 tons, 18.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   45,024 lbs / 20,422 Kg = 52.1 x 12.0 " / 305 mm shells or 6.8 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 4.9 ft / 1.5 m
 Roll period: 15.5 seconds
 Steadiness - As gun platform (Average = 50 %): 80 %
   - Recoil effect (Restricted arc if above 1.00): 0.77
 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): 0.623 / 0.633
 Length to Beam Ratio: 7.73 : 1
 'Natural speed' for length: 25.18 kts
 Power going to wave formation at top speed: 49 %
 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: 25.00 %,  27.00 ft / 8.23 m,  26.00 ft / 7.92 m
    - Forward deck: 30.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Aft deck: 17.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 28.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  23.86 ft / 7.27 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 85.0 %
  - Above water (accommodation/working, high = better): 193.7 %
 Waterplane Area: 38,846 Square feet or 3,609 Square metres
 Displacement factor (Displacement / loading): 122 %
 Structure weight / hull surface area: 148 lbs/sq ft or 723 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.57
  - Overall: 1.00
 Adequate 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

I am a bit disappointed with the latest Springsharp beta

The latest Springsharp beta still does not allow me to have higher power output machinery. As far back as a 1905 design (HMS Swift), the British were able to achieve a 60 SHP/ton of machinery weight propulsion plant. Admittedly, that was with the machinery being stressed, but I do not believe overly so. I cannot find a way to do better than 50 SHP/ton and I believe that the power required is too great for the size of ship. All you have to do is consult a Conways and look at the British Tribal class destroyerss bujild from 1937 and later. For a nominal 44,000 SHP, the could reach a nominal speed of 36.25 to 36.5 knots. For a comparably-sized ship, Springsharp requires an absurd 78,440 SHP to reach 37 knots. This is the Springsharp report:

Super Swift, Great Britain Scout Cruiser laid down 1912 (Engine 1950)

Displacement:
 2,225 t light; 2,291 t standard; 2,445 t normal; 2,568 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (380.73 ft / 378.00 ft) x 37.00 ft x (13.75 / 14.24 ft)
 (116.05 m / 115.21 m) x 11.28 m  x (4.19 / 4.34 m)

Armament:
      6 - 4.00" / 102 mm 50.0 cal guns - 33.88lbs / 15.37kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1912 Model
   2 x Single mounts on centreline ends, evenly spread
   4 x Single mounts on sides, forward deck aft
      Weight of broadside 203 lbs / 92 kg
      Main Torpedoes
      2 - 18.0" / 457 mm, 21.00 ft / 6.40 m torpedoes - 0.905 t each, 1.810 t total
 In 2 sets of deck mounted centre rotating tubes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 78,440 shp / 58,517 Kw = 37.00 kts
 Range 3,750nm at 14.00 kts
 Bunker at max displacement = 277 tons

Complement:
 173 - 226

Cost:
 £0.304 million / $1.216 million

Distribution of weights at normal displacement:
 Armament: 66 tons, 2.7 %
    - Guns: 62 tons, 2.6 %
    - Weapons: 4 tons, 0.1 %
 Armour: 37 tons, 1.5 %
    - Armament: 37 tons, 1.5 %
 Machinery: 1,460 tons, 59.7 %
 Hull, fittings & equipment: 662 tons, 27.1 %
 Fuel, ammunition & stores: 220 tons, 9.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   510 lbs / 232 Kg = 15.9 x 4.0 " / 102 mm shells or 0.4 torpedoes
 Stability (Unstable if below 1.00): 1.31
 Metacentric height 1.8 ft / 0.6 m
 Roll period: 11.5 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.26
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and a round stern
 Block coefficient (normal/deep): 0.445 / 0.451
 Length to Beam Ratio: 10.22 : 1
 'Natural speed' for length: 19.44 kts
 Power going to wave formation at top speed: 71 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 6.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 16.00 %,  26.00 ft / 7.92 m,  24.00 ft / 7.32 m
    - Forward deck: 18.00 %,  24.00 ft / 7.32 m,  24.00 ft / 7.32 m
    - Aft deck: 51.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
    - Quarter deck: 15.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
    - Average freeboard:  18.85 ft / 5.74 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 200.6 %
  - Above water (accommodation/working, high = better): 145.1 %
 Waterplane Area: 8,885 Square feet or 825 Square metres
 Displacement factor (Displacement / loading): 61 %
 Structure weight / hull surface area: 34 lbs/sq ft or 167 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.42
  - Longitudinal: 2.79
  - Overall: 0.51
 Extremely poor machinery, storage, compartmentation space
 Excellent accommodation and workspace room

The battlecruiser analog of the GB/BB/1906: the GB/CB/1906

The battlecruiser version of the GB/BB/1906 naturally has lighter armour and higher speed. The lower belt is still 8in thick, so it is not another Invincible. The speed is also higher at 27 knots (although I had heard that an invincible might be able to make higher speed). The ships have 8-12in/45 and 16-4in QF guns. This is the Springsharp report:

\GB/BB/1906, Great Britain Battlecruiser laid down 1906 (Engine 1911)

Displacement:
 20,854 t light; 21,808 t standard; 26,192 t normal; 29,700 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (645.00 ft / 638.00 ft) x 82.00 ft x (27.00 / 30.07 ft)
 (196.60 m / 194.46 m) x 24.99 m  x (8.23 / 9.16 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 100 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
      16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1906 Model
   16 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 7,487 lbs / 3,396 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 430.00 ft / 131.06 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 6.00" / 152 mm 430.00 ft / 131.06 m 8.00 ft / 2.44 m
   Main Belt covers 104 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 430.00 ft / 131.06 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: 10.0" / 254 mm 8.00" / 203 mm  10.0" / 254 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 11.00" / 279 mm, Aft 8.00" / 203 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 82,731 shp / 61,717 Kw = 27.00 kts
 Range 7,500nm at 16.00 kts
 Bunker at max displacement = 7,891 tons (100% coal)

Complement:
 1,029 - 1,338

Cost:
 £1.923 million / $7.691 million

Distribution of weights at normal displacement:
 Armament: 1,331 tons, 5.1 %
    - Guns: 1,331 tons, 5.1 %
 Armour: 7,070 tons, 27.0 %
    - Belts: 2,188 tons, 8.4 %
    - Torpedo bulkhead: 859 tons, 3.3 %
    - Armament: 2,171 tons, 8.3 %
    - Armour Deck: 1,491 tons, 5.7 %
    - Conning Towers: 361 tons, 1.4 %
 Machinery: 3,693 tons, 14.1 %
 Hull, fittings & equipment: 8,759 tons, 33.4 %
 Fuel, ammunition & stores: 5,338 tons, 20.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   42,557 lbs / 19,303 Kg = 49.3 x 12.0 " / 305 mm shells or 6.1 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 4.6 ft / 1.4 m
 Roll period: 16.0 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.82
 Seaboat quality  (Average = 1.00): 1.29

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.649 / 0.661
 Length to Beam Ratio: 7.78 : 1
 'Natural speed' for length: 25.26 kts
 Power going to wave formation at top speed: 53 %
 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: 25.00 %,  29.00 ft / 8.84 m,  27.00 ft / 8.23 m
    - Forward deck: 30.00 %,  27.00 ft / 8.23 m,  26.00 ft / 7.92 m
    - Aft deck: 14.00 %,  26.00 ft / 7.92 m,  26.00 ft / 7.92 m
    - Quarter deck: 31.00 %,  18.00 ft / 5.49 m,  18.00 ft / 5.49 m
    - Average freeboard:  24.12 ft / 7.35 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 102.2 %
  - Above water (accommodation/working, high = better): 195.2 %
 Waterplane Area: 40,040 Square feet or 3,720 Square metres
 Displacement factor (Displacement / loading): 125 %
 Structure weight / hull surface area: 155 lbs/sq ft or 758 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.52
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

My 1906 British fast battleship

I have had a concept for a British fast battleship for 1906. The boilers are coal-fired and the machinery is direct-drive turbines. I like to use a good bit of length to achieve speed, to keep other characteristics in check. This is a ship with 8-12in/45 and 16-4in QF guns. The armour basis is 10in with a 2in deck. Since the tiny Michigan and South Carolina had superfiring guns, I figure that the ships should have them as well. The "all-or-nothing" armour scheme is rather edgy, I admit. This is the Springsharp report:

GB/BB/1906, Great Britain Battleship laid down 1906 (Engine 1911)

Displacement:
 19,696 t light; 20,703 t standard; 24,948 t normal; 28,343 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (635.00 ft / 628.00 ft) x 82.00 ft x (27.00 / 30.07 ft)
 (193.55 m / 191.41 m) x 24.99 m  x (8.23 / 9.17 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 120 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
      16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1906 Model
   16 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 7,487 lbs / 3,396 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.0" / 254 mm 410.00 ft / 124.97 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 410.00 ft / 124.97 m 8.00 ft / 2.44 m
   Main Belt covers 100 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 410.00 ft / 124.97 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: 11.0" / 279 mm 9.00" / 229 mm  11.0" / 279 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 11.00" / 279 mm, Aft 8.00" / 203 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 50,568 shp / 37,724 Kw = 24.00 kts
 Range 7,500nm at 16.00 kts
 Bunker at max displacement = 7,640 tons (100% coal)

Complement:
 992 - 1,290

Cost:
 £1.681 million / $6.724 million

Distribution of weights at normal displacement:
 Armament: 1,331 tons, 5.3 %
    - Guns: 1,331 tons, 5.3 %
 Armour: 7,625 tons, 30.6 %
    - Belts: 2,694 tons, 10.8 %
    - Torpedo bulkhead: 819 tons, 3.3 %
    - Armament: 2,323 tons, 9.3 %
    - Armour Deck: 1,439 tons, 5.8 %
    - Conning Towers: 349 tons, 1.4 %
 Machinery: 2,257 tons, 9.0 %
 Hull, fittings & equipment: 8,483 tons, 34.0 %
 Fuel, ammunition & stores: 5,251 tons, 21.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   50,065 lbs / 22,709 Kg = 57.9 x 12.0 " / 305 mm shells or 8.4 torpedoes
 Stability (Unstable if below 1.00): 1.09
 Metacentric height 4.4 ft / 1.3 m
 Roll period: 16.5 seconds
 Steadiness - As gun platform (Average = 50 %): 81 %
   - Recoil effect (Restricted arc if above 1.00): 0.95
 Seaboat quality  (Average = 1.00): 1.63

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.628 / 0.641
 Length to Beam Ratio: 7.66 : 1
 'Natural speed' for length: 25.06 kts
 Power going to wave formation at top speed: 47 %
 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: 25.00 %,  28.00 ft / 8.53 m,  26.00 ft / 7.92 m
    - Forward deck: 30.00 %,  26.00 ft / 7.92 m,  25.00 ft / 7.62 m
    - Aft deck: 14.00 %,  25.00 ft / 7.62 m,  25.00 ft / 7.62 m
    - Quarter deck: 31.00 %,  17.00 ft / 5.18 m,  17.00 ft / 5.18 m
    - Average freeboard:  23.12 ft / 7.05 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 80.7 %
  - Above water (accommodation/working, high = better): 188.1 %
 Waterplane Area: 38,657 Square feet or 3,591 Square metres
 Displacement factor (Displacement / loading): 134 %
 Structure weight / hull surface area: 157 lbs/sq ft or 765 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - 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

GB/CB/1914: my first Springsharp 3.0 3rd Beta design

I finally downloaded the third Springsharp 3.0 3rd Beta version. I decided to try the large, fast battlecruiser with 12in armour: the GB/CB/1914. This is a design that is more archaic looking than the Hood, but a stronger and more heavily armed ship:

GB/CB/1914, Great Britain Battlecruiser laid down 1914 (Engine 1921)

Displacement:
 40,459 t light; 42,785 t standard; 45,940 t normal; 48,465 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (821.00 ft / 814.00 ft) x 108.00 ft x (31.00 / 32.39 ft)
 (250.24 m / 248.11 m) x 32.92 m  x (9.45 / 9.87 m)

Armament:
      10 - 15.00" / 381 mm 42.0 cal guns - 1,920.01lbs / 870.90kg shells, 120 per gun
   Breech loading guns in turret on barbette mounts, 1914 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
   1 x Twin mount on centreline, forward deck aft
      14 - 6.00" / 152 mm 45.0 cal guns - 108.93lbs / 49.41kg shells, 150 per gun
   Quick firing guns in casemate mounts, 1914 Model
   14 x Single mounts on sides, evenly spread
  14 hull mounts in casemates- Limited use in heavy seas
      Weight of broadside 20,725 lbs / 9,401 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 570.00 ft / 173.74 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 9.00" / 229 mm 570.00 ft / 173.74 m 8.00 ft / 2.44 m
   Main Belt covers 108 % of normal length

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 570.00 ft / 173.74 m 31.00 ft / 9.45 m
 Beam between torpedo bulkheads 86.00 ft / 26.21 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: 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 12.00" / 305 mm, Aft 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 160,033 shp / 119,385 Kw = 30.00 kts
 Range 7,500nm at 16.00 kts
 Bunker at max displacement = 5,680 tons

Complement:
 1,568 - 2,039

Cost:
 £4.688 million / $18.752 million

Distribution of weights at normal displacement:
 Armament: 2,794 tons, 6.1 %
    - Guns: 2,794 tons, 6.1 %
 Armour: 14,133 tons, 30.8 %
    - Belts: 4,307 tons, 9.4 %
    - Torpedo bulkhead: 1,308 tons, 2.8 %
    - Armament: 4,380 tons, 9.5 %
    - Armour Deck: 3,557 tons, 7.7 %
    - Conning Towers: 580 tons, 1.3 %
 Machinery: 5,511 tons, 12.0 %
 Hull, fittings & equipment: 18,021 tons, 39.2 %
 Fuel, ammunition & stores: 5,481 tons, 11.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   74,422 lbs / 33,757 Kg = 44.1 x 15.0 " / 381 mm shells or 11.0 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 7.2 ft / 2.2 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 62 %
   - Recoil effect (Restricted arc if above 1.00): 0.84
 Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
 Hull has low quarterdeck ,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.590 / 0.596
 Length to Beam Ratio: 7.54 : 1
 'Natural speed' for length: 28.53 kts
 Power going to wave formation at top speed: 51 %
 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: 25.00 %,  31.00 ft / 9.45 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: 14.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Quarter deck: 31.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Average freeboard:  26.12 ft / 7.96 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 88.0 %
  - Above water (accommodation/working, high = better): 219.3 %
 Waterplane Area: 63,699 Square feet or 5,918 Square metres
 Displacement factor (Displacement / loading): 117 %
 Structure weight / hull surface area: 212 lbs/sq ft or 1,036 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.37
  - Overall: 1.00
 Adequate machinery, storage, compartmentation space
 Excellent accommodation and workspace room
 Good seaboat, rides out heavy weather easily

The new Springsharp Beta is available

I just received an email from Ian Ross-Gowan saying that the third Beta of Springsharp is now available for download.