Logi's Design Studies

[ctwaterman]

The three principles of Ship Design....

Speed, Fire Power, Armor...

to gain more of one you have to sacrafice some of the others....

If you want to make is a square and 4 principles you devide speed into
speed and range

Charles

[Logi]

These designs are great, but the ships aren't small enough. We need to go smaller.



How small?



SMALLER

Minimalist Concept Study,  Fast Pocket Battleship laid down 1923

Displacement:
   18,000 t light; 18,994 t standard; 20,275 t normal; 21,300 t full load

Dimensions: Length overall / water x beam x draught
   520.00 ft / 520.00 ft x 86.20 ft x 29.00 ft (normal load)
   158.50 m / 158.50 m x 26.27 m  x 8.84 m

Armament:
     6 - 16.00" / 406 mm guns (2x3 guns), 2,048.00lbs / 928.96kg shells, 1923 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread
     12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1923 Model
     Quick firing guns in deck mounts with hoists
     on side, all amidships, 2 raised mounts - superfiring
     2 - 3.00" / 76.2 mm guns (1x2 guns), 13.50lbs / 6.12kg shells, 1923 Model
     Anti-aircraft guns in deck mount
     on centreline amidships, all raised guns - superfiring
   Weight of broadside 13,065 lbs / 5,926 kg
   Shells per gun, main battery: 80

Armour:
  - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   11.5" / 292 mm   337.00 ft / 102.72 m   12.77 ft / 3.89 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length
     Main Belt sloped 20 degrees externally, vertical height of 12 ft.

  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   15.0" / 381 mm   5.00" / 127 mm      8.00" / 203 mm
   2nd:   0.50" / 13 mm   0.50" / 13 mm      0.50" / 13 mm
   3rd:   0.25" / 6 mm   0.25" / 6 mm            -

  - Armour deck: 3.00" / 76 mm, Conning tower: 3.00" / 76 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 65,222 shp / 48,655 Kw = 26.00 kts
   Range 10,000nm at 12.00 kts
   Bunker at max displacement = 2,307 tons

Complement:
   849 - 1,104

Cost:
   £6.711 million / $26.845 million

Distribution of weights at normal displacement:
   Armament: 1,633 tons, 8.1 %
   Armour: 5,213 tons, 25.7 %
      - Belts: 2,172 tons, 10.7 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 1,263 tons, 6.2 %
      - Armour Deck: 1,730 tons, 8.5 %
      - Conning Tower: 48 tons, 0.2 %
   Machinery: 2,180 tons, 10.8 %
   Hull, fittings & equipment: 8,649 tons, 42.7 %
   Fuel, ammunition & stores: 2,275 tons, 11.2 %
   Miscellaneous weights: 325 tons, 1.6 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     20,340 lbs / 9,226 Kg = 9.9 x 16.0 " / 406 mm shells or 2.3 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 4.6 ft / 1.4 m
   Roll period: 16.8 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.87
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.546
   Length to Beam Ratio: 6.03 : 1
   'Natural speed' for length: 22.80 kts
   Power going to wave formation at top speed: 58 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      21.00 ft / 6.40 m
      - Forecastle (20 %):   20.00 ft / 6.10 m
      - Mid (50 %):      20.00 ft / 6.10 m
      - Quarterdeck (15 %):   19.00 ft / 5.79 m
      - Stern:      19.00 ft / 5.79 m
      - Average freeboard:   19.76 ft / 6.02 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 96.1 %
      - Above water (accommodation/working, high = better): 137.9 %
   Waterplane Area: 31,163 Square feet or 2,895 Square metres
   Displacement factor (Displacement / loading): 88 %
   Structure weight / hull surface area: 190 lbs/sq ft or 929 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.50
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

[Logi]

SMALLER

(Armor has dropped significantly, but the ship can now be built in one year.)

Minimalist Concept Study,  Pocket Battleship laid down 1923

Displacement:
   15,000 t light; 15,934 t standard; 17,305 t normal; 18,402 t full load

Dimensions: Length overall / water x beam x draught
   500.00 ft / 500.00 ft x 83.40 ft x 28.50 ft (normal load)
   152.40 m / 152.40 m x 25.42 m  x 8.69 m

Armament:
     6 - 16.00" / 406 mm guns (2x3 guns), 2,048.00lbs / 928.96kg shells, 1923 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread
     12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1923 Model
     Quick firing guns in deck mounts with hoists
     on side, all amidships
     2 - 3.00" / 76.2 mm guns (1x2 guns), 13.50lbs / 6.12kg shells, 1923 Model
     Anti-aircraft guns in deck mount
     on centreline amidships
   Weight of broadside 13,065 lbs / 5,926 kg
   Shells per gun, main battery: 80

Armour:
  - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   10.6" / 269 mm   324.00 ft / 98.76 m   12.77 ft / 3.89 m
   Ends:   Unarmoured
     Main Belt covers 100 % of normal length
     Main Belt sloped 20 degrees externally, vertical height of 12 ft.

  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm   4.00" / 102 mm      7.00" / 178 mm
   2nd:   0.50" / 13 mm   0.50" / 13 mm      0.50" / 13 mm
   3rd:   0.25" / 6 mm   0.25" / 6 mm            -

  - Armour deck: 2.10" / 53 mm, Conning tower: 3.00" / 76 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 42,803 shp / 31,931 Kw = 24.00 kts
   Range 12,000nm at 12.00 kts
   Bunker at max displacement = 2,468 tons

Complement:
   753 - 980

Cost:
   £6.101 million / $24.403 million

Distribution of weights at normal displacement:
   Armament: 1,633 tons, 9.4 %
   Armour: 3,996 tons, 23.1 %
      - Belts: 1,920 tons, 11.1 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 944 tons, 5.5 %
      - Armour Deck: 1,089 tons, 6.3 %
      - Conning Tower: 43 tons, 0.2 %
   Machinery: 1,431 tons, 8.3 %
   Hull, fittings & equipment: 7,640 tons, 44.2 %
   Fuel, ammunition & stores: 2,305 tons, 13.3 %
   Miscellaneous weights: 300 tons, 1.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     15,815 lbs / 7,173 Kg = 7.7 x 16.0 " / 406 mm shells or 2.1 torpedoes
   Stability (Unstable if below 1.00): 1.09
   Metacentric height 4.5 ft / 1.4 m
   Roll period: 16.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 52 %
         - Recoil effect (Restricted arc if above 1.00): 0.80
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.510
   Length to Beam Ratio: 6.00 : 1
   'Natural speed' for length: 22.36 kts
   Power going to wave formation at top speed: 54 %
   Trim (Max stability = 0, Max steadiness = 100): 52
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      17.00 ft / 5.18 m
      - Forecastle (20 %):   16.00 ft / 4.88 m
      - Mid (50 %):      16.00 ft / 4.88 m
      - Quarterdeck (15 %):   15.00 ft / 4.57 m
      - Stern:      15.00 ft / 4.57 m
      - Average freeboard:   15.76 ft / 4.80 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 98.2 %
      - Above water (accommodation/working, high = better): 111.5 %
   Waterplane Area: 28,030 Square feet or 2,604 Square metres
   Displacement factor (Displacement / loading): 86 %
   Structure weight / hull surface area: 192 lbs/sq ft or 936 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.28
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is adequate

[Jefgte]

IMO, test on a 170m hull to increase the speed to 26-27kts
Then, she could be a good fast wing of the 22-24kts battle line.
Reduce the armor if neccessary.


Jef

[Logi]

I don't like the armor at all. High recoil so firing must be done in sequential order. No full salvo broadsides.

Minimalist Concept Study,  Light Battlecruiser laid down 1923

Displacement:
   15,000 t light; 15,934 t standard; 17,310 t normal; 18,411 t full load

Dimensions: Length overall / water x beam x draught
   513.00 ft / 513.00 ft x 84.00 ft x 27.50 ft (normal load)
   156.36 m / 156.36 m x 25.60 m  x 8.38 m

Armament:
      6 - 16.00" / 406 mm guns (2x3 guns), 2,048.00lbs / 928.96kg shells, 1923 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread
      12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1923 Model
     Quick firing guns in deck mounts with hoists
     on side, all amidships
      2 - 3.00" / 76.2 mm guns (1x2 guns), 13.50lbs / 6.12kg shells, 1923 Model
     Anti-aircraft guns in deck mount
     on centreline amidships
   Weight of broadside 13,065 lbs / 5,926 kg
   Shells per gun, main battery: 80

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.00" / 178 mm   360.00 ft / 109.73 m   12.77 ft / 3.89 m
   Ends:   Unarmoured
     Main Belt covers 108 % of normal length
     Main Belt sloped 20 degrees externally, vertical height of 12 ft.

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   8.00" / 203 mm   3.00" / 76 mm      5.00" / 127 mm
   2nd:   0.50" / 13 mm   0.50" / 13 mm      0.50" / 13 mm
   3rd:   0.25" / 6 mm   0.25" / 6 mm            -

   - Armour deck: 1.50" / 38 mm, Conning tower: 3.00" / 76 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 58,419 shp / 43,581 Kw = 26.00 kts
   Range 12,000nm at 12.00 kts
   Bunker at max displacement = 2,476 tons

Complement:
   753 - 980

Cost:
   £6.313 million / $25.253 million

Distribution of weights at normal displacement:
   Armament: 1,633 tons, 9.4 %
   Armour: 2,966 tons, 17.1 %
      - Belts: 1,379 tons, 8.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 739 tons, 4.3 %
      - Armour Deck: 805 tons, 4.7 %
      - Conning Tower: 43 tons, 0.2 %
   Machinery: 1,953 tons, 11.3 %
   Hull, fittings & equipment: 8,141 tons, 47.0 %
   Fuel, ammunition & stores: 2,310 tons, 13.3 %
   Miscellaneous weights: 308 tons, 1.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     14,714 lbs / 6,674 Kg = 7.2 x 16.0 " / 406 mm shells or 1.9 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 4.7 ft / 1.4 m
   Roll period: 16.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.90
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.511
   Length to Beam Ratio: 6.11 : 1
   'Natural speed' for length: 22.65 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      20.00 ft / 6.10 m
      - Forecastle (20 %):   19.00 ft / 5.79 m
      - Mid (50 %):      18.50 ft / 5.64 m
      - Quarterdeck (15 %):   18.00 ft / 5.49 m
      - Stern:      19.00 ft / 5.79 m
      - Average freeboard:   18.67 ft / 5.69 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 107.9 %
      - Above water (accommodation/working, high = better): 135.6 %
   Waterplane Area: 29,008 Square feet or 2,695 Square metres
   Displacement factor (Displacement / loading): 86 %
   Structure weight / hull surface area: 194 lbs/sq ft or 945 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.50
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

[Jefgte]

Increase the lenght & perhaps the displacement to 16000t
BC is too low

[Logi]

BC is on the level of the a OTL Brookyln class cruiser.

An increase to 16000 ton requires 1.5 years to build, defeating the purpose of the 15000 ton limit.

Increasing length reduces strength in the ship rather than increasing it. The saved freeboard does not offset the lowered BC and required lengthened main belt. I have tested this ship with length changes from 1 ft to 20 ft. None gets better than this without lowering BC.

I tweaked the design a slight amount to get a higher BC, but it costs secondary gun armor.

Minimalist Concept Study,  Light Battlecruiser laid down 1923

Displacement:
   15,000 t light; 15,934 t standard; 17,310 t normal; 18,411 t full load

Dimensions: Length overall / water x beam x draught
   511.00 ft / 511.00 ft x 83.90 ft x 27.20 ft (normal load)
   155.75 m / 155.75 m x 25.57 m  x 8.29 m

Armament:
     6 - 16.00" / 406 mm guns (2x3 guns), 2,048.00lbs / 928.96kg shells, 1923 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread
     12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1923 Model
     Quick firing guns in deck mounts with hoists
     on side, all amidships
     2 - 3.00" / 76.2 mm guns (1x2 guns), 13.50lbs / 6.12kg shells, 1923 Model
     Anti-aircraft guns in deck mount
     on centreline amidships
   Weight of broadside 13,065 lbs / 5,926 kg
   Shells per gun, main battery: 80

Armour:
  - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   7.00" / 178 mm   359.00 ft / 109.42 m   12.77 ft / 3.89 m
   Ends:   Unarmoured
     Main Belt covers 108 % of normal length
    Main Belt sloped 20 degrees externally, vertical height of 12 ft.

  - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   8.00" / 203 mm   3.00" / 76 mm      5.00" / 127 mm
   2nd:   0.50" / 13 mm   0.33" / 8 mm      0.50" / 13 mm
   3rd:   0.25" / 6 mm   0.25" / 6 mm            -

  - Armour deck: 1.50" / 38 mm, Conning tower: 3.00" / 76 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 58,786 shp / 43,855 Kw = 26.00 kts
   Range 12,000nm at 12.00 kts
   Bunker at max displacement = 2,478 tons

Complement:
   753 - 980

Cost:
   £6.318 million / $25.273 million

Distribution of weights at normal displacement:
   Armament: 1,633 tons, 9.4 %
   Armour: 2,963 tons, 17.1 %
      - Belts: 1,377 tons, 8.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 736 tons, 4.3 %
      - Armour Deck: 807 tons, 4.7 %
      - Conning Tower: 43 tons, 0.2 %
   Machinery: 1,965 tons, 11.4 %
   Hull, fittings & equipment: 8,138 tons, 47.0 %
   Fuel, ammunition & stores: 2,310 tons, 13.3 %
   Miscellaneous weights: 300 tons, 1.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     14,784 lbs / 6,706 Kg = 7.2 x 16.0 " / 406 mm shells or 1.9 torpedoes
   Stability (Unstable if below 1.00): 1.11
   Metacentric height 4.7 ft / 1.4 m
   Roll period: 16.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.91
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.520
   Length to Beam Ratio: 6.09 : 1
   'Natural speed' for length: 22.61 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      21.00 ft / 6.40 m
      - Forecastle (20 %):   19.00 ft / 5.79 m
      - Mid (50 %):      19.00 ft / 5.79 m
      - Quarterdeck (15 %):   18.00 ft / 5.49 m
      - Stern:      19.00 ft / 5.79 m
      - Average freeboard:   18.91 ft / 5.76 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 108.0 %
      - Above water (accommodation/working, high = better): 137.8 %
   Waterplane Area: 29,082 Square feet or 2,702 Square metres
   Displacement factor (Displacement / loading): 85 %
   Structure weight / hull surface area: 193 lbs/sq ft or 944 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.51
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

[Blooded]

Hello,

I could not figure out what your shipbuilding times were about. From the rules...

If the ship is larger than 500 t light displacement, the minimum building time is:  (light displacement / 1000) + 9 months.  This figure may be rounded to the nearest month.

So 24 months at 15,000 tons and 25 at 16,000.


I would agree that the BC is too low and add the beam to narrow for triple 16" turrets. SS manipulation at its best.

[Jefgte]

Reduce the speed to 25.5kts

[Delta Force]

The low amount of damage that these ships can take is somewhat worrying. If you get hit by even one torpedo your ship is going to be in a very bad situation, at best having a severe list.

[Logi]

@Blooded
Reports are done biannually, as a result the sim advances in 12 month steps. Therefore a ship that is done in 24 months is done in 2 sim halves, but one that is done in 25 months, is in all manners, done in 3 sim halves. Therefore you can use a ship that has 24 month building time in 1 year, but one with 25 month building time only after 1.5 years.


Regarding space for the triple 16" turrets. As the superstructure should be short and there are only two triples, the BC should narrow the beam by only ~ 10ft from the maximum at the point of the turret's placement.

So ~74 ft for the turrets at the beam. The diameter of a 16" triple gun is ~37 ft. Therefore, 37 ft leftover. The slant of the main belt at 20 degrees, yields on a required space of 4.3 ft from the low belt height of 12 ft. So ~28 ft left over, or ~14 ft per side. There is no TDS so there is more than enough space.

Even if the beam at turret placement is only 50 ft, there would still be enough space for the turrets. The problem with turret placement and width results from the width needed by a TDS, which this ship has none of.

@Delta Force
This isn't even on the scale of a real battleship, it's on the scale of a CRUISER. You can also build several of them compared to a conventional battleship. The survivability, if you add it up, is similar to that of a conventional battleship per tonnage.

Added with having to target more ships and it makes up for it. That and if you're worried abut this survivability on a cruiser hull, something is wrong with your fleet. Everything at 15 kton tonnage will start to list badly after a torpedo hit.

[Logi]

At 25.5 kts...

1" thicker main belt, high BC (but higher recoil as well), 2" thicker gun face, 1" thicker gun barbette...

Minimalist Concept Study,  Light Battlecruiser laid down 1923

Displacement:
   15,000 t light; 15,934 t standard; 17,309 t normal; 18,409 t full load

Dimensions: Length overall / water x beam x draught
   500.00 ft / 500.00 ft x 83.20 ft x 27.38 ft (normal load)
   152.40 m / 152.40 m x 25.36 m  x 8.35 m

Armament:
      6 - 16.00" / 406 mm guns (2x3 guns), 2,048.00lbs / 928.96kg shells, 1923 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread
      12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1923 Model
     Quick firing guns in deck mounts with hoists
     on side, all amidships
      2 - 3.00" / 76.2 mm guns (1x2 guns), 13.50lbs / 6.12kg shells, 1923 Model
     Anti-aircraft guns in deck mount
     on centreline amidships
   Weight of broadside 13,065 lbs / 5,926 kg
   Shells per gun, main battery: 80

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   8.00" / 203 mm   344.50 ft / 105.00 m   12.77 ft / 3.89 m
   Ends:   Unarmoured
     Main Belt covers 106 % of normal length
     Main Belt sloped 20 degrees externally, vertical height of 12 ft.

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   10.0" / 254 mm   3.00" / 76 mm      6.00" / 152 mm
   2nd:   0.50" / 13 mm   0.50" / 13 mm      0.50" / 13 mm
   3rd:   0.25" / 6 mm   0.25" / 6 mm            -

   - Armour deck: 1.50" / 38 mm, Conning tower: 3.00" / 76 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 55,248 shp / 41,215 Kw = 25.50 kts
   Range 12,000nm at 12.00 kts
   Bunker at max displacement = 2,475 tons

Complement:
   753 - 980

Cost:
   £6.270 million / $25.080 million

Distribution of weights at normal displacement:
   Armament: 1,633 tons, 9.4 %
   Armour: 3,220 tons, 18.6 %
      - Belts: 1,520 tons, 8.8 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 864 tons, 5.0 %
      - Armour Deck: 792 tons, 4.6 %
      - Conning Tower: 43 tons, 0.2 %
   Machinery: 1,847 tons, 10.7 %
   Hull, fittings & equipment: 8,000 tons, 46.2 %
   Fuel, ammunition & stores: 2,309 tons, 13.3 %
   Miscellaneous weights: 300 tons, 1.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     15,172 lbs / 6,882 Kg = 7.4 x 16.0 " / 406 mm shells or 1.9 torpedoes
   Stability (Unstable if below 1.00): 1.10
   Metacentric height 4.6 ft / 1.4 m
   Roll period: 16.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.94
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.532
   Length to Beam Ratio: 6.01 : 1
   'Natural speed' for length: 22.36 kts
   Power going to wave formation at top speed: 57 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      21.00 ft / 6.40 m
      - Forecastle (20 %):   19.00 ft / 5.79 m
      - Mid (50 %):      19.00 ft / 5.79 m
      - Quarterdeck (15 %):   18.00 ft / 5.49 m
      - Stern:      20.00 ft / 6.10 m
      - Average freeboard:   18.99 ft / 5.79 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 105.9 %
      - Above water (accommodation/working, high = better): 135.2 %
   Waterplane Area: 28,544 Square feet or 2,652 Square metres
   Displacement factor (Displacement / loading): 85 %
   Structure weight / hull surface area: 193 lbs/sq ft or 942 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.89
      - Longitudinal: 2.59
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

[Logi]

Lower BC variant, 1" thicker main belt, 0.521 BC (Brooklyn Class level), 2" thicker gun face, 0.5" thicker gun barbette.

Lower recoil.

Minimalist Concept Study,  Light Battlecruiser laid down 1923

Displacement:
   15,000 t light; 15,934 t standard; 17,311 t normal; 18,413 t full load

Dimensions: Length overall / water x beam x draught
   513.00 ft / 513.00 ft x 84.00 ft x 27.00 ft (normal load)
   156.36 m / 156.36 m x 25.60 m  x 8.23 m

Armament:
      6 - 16.00" / 406 mm guns (2x3 guns), 2,048.00lbs / 928.96kg shells, 1923 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, evenly spread
      12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1923 Model
     Quick firing guns in deck mounts with hoists
     on side, all amidships
      2 - 3.00" / 76.2 mm guns (1x2 guns), 13.50lbs / 6.12kg shells, 1923 Model
     Anti-aircraft guns in deck mount
     on centreline amidships
   Weight of broadside 13,065 lbs / 5,926 kg
   Shells per gun, main battery: 80

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   8.00" / 203 mm   351.00 ft / 106.98 m   12.77 ft / 3.89 m
   Ends:   Unarmoured
     Main Belt covers 105 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   10.0" / 254 mm   3.00" / 76 mm      5.50" / 140 mm
   2nd:   0.50" / 13 mm   0.50" / 13 mm      0.50" / 13 mm
   3rd:   0.25" / 6 mm   0.25" / 6 mm            -

   - Armour deck: 1.50" / 38 mm, Conning tower: 3.00" / 76 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 4 shafts, 54,264 shp / 40,481 Kw = 25.50 kts
   Range 12,000nm at 12.00 kts
   Bunker at max displacement = 2,479 tons

Complement:
   753 - 980

Cost:
   £6.257 million / $25.027 million

Distribution of weights at normal displacement:
   Armament: 1,633 tons, 9.4 %
   Armour: 3,203 tons, 18.5 %
      - Belts: 1,548 tons, 8.9 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 800 tons, 4.6 %
      - Armour Deck: 812 tons, 4.7 %
      - Conning Tower: 43 tons, 0.2 %
   Machinery: 1,814 tons, 10.5 %
   Hull, fittings & equipment: 8,050 tons, 46.5 %
   Fuel, ammunition & stores: 2,311 tons, 13.4 %
   Miscellaneous weights: 300 tons, 1.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     15,274 lbs / 6,928 Kg = 7.5 x 16.0 " / 406 mm shells or 2.0 torpedoes
   Stability (Unstable if below 1.00): 1.12
   Metacentric height 4.8 ft / 1.5 m
   Roll period: 16.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 51 %
         - Recoil effect (Restricted arc if above 1.00): 0.86
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.521
   Length to Beam Ratio: 6.11 : 1
   'Natural speed' for length: 22.65 kts
   Power going to wave formation at top speed: 56 %
   Trim (Max stability = 0, Max steadiness = 100): 51
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      20.00 ft / 6.10 m
      - Forecastle (20 %):   18.00 ft / 5.49 m
      - Mid (50 %):      18.00 ft / 5.49 m
      - Quarterdeck (15 %):   17.00 ft / 5.18 m
      - Stern:      18.00 ft / 5.49 m
      - Average freeboard:   17.91 ft / 5.46 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 105.3 %
      - Above water (accommodation/working, high = better): 131.3 %
   Waterplane Area: 29,264 Square feet or 2,719 Square metres
   Displacement factor (Displacement / loading): 86 %
   Structure weight / hull surface area: 193 lbs/sq ft or 940 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.91
      - Longitudinal: 2.34
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is excellent

[Sachmle]

Sims are done in 6mo intervals. A 15,000t ship takes 15+9=24 months (2yrs) to build. 4 sim reports total.

[Logi]

Opps! My bad, but my point stands. :-[

For some reason I've been confusing 12 and 24 months for a year recently.