I tried doing a sim based on Fletcher based on Friedman's book. The freeboard is based on Friedman's drawing and the reported draft + depth. Had to use "Transom stern - large" to get it to somewhat work (small transom only yields 0.46 strength), but some issues remain:

1. "Minimum main belt length to cover machinery and magazines is excessive at 406.17 ft. There are no warnings in the report simply because the current design doesn't use belt armor.

2. Sea-keeping is excessively low even for a wet destroyer. But this is an issue we've known about since SS2.

3. Lightship is overweight; this seems to be true of all designs not just DDs. In this case it seems to be mostly from over-reported machinery weight. SS3 has it at 1382 tons vs 862.4~897.3 (dry) in Friedman. If this difference is subtracted from SS3's reported lightship, the discrepancy narrows from 532~435 (overweight) to 12.4 ~ -49.7.

4. Its difficult to simulate the box over machinery & magazines. It's supposed to be 30# (0.75") on the sides and 20# (0.5") on the deck. Can't really simulate the sides as is; would need some way to pick a good midway point to simulate this. If I pick 30# instead of 20# for the sides, the composite strength drops to 0.47 even without FC/QD deck armors.

In the text section, Friedman mentions the 5" only have 2100 rounds in total even though it's listed as 600 per gun. He also mentions "4 reloads" for the torpedoes but I'm not sure if its 4 sets or just 4. Here I assumed it was sets.

So ultimately the issue is the resistance/propulsive model SS3 uses (H&M). At least in Fletcher's case the other inaccuracies in estimation mostly cancel out.

QuoteFletcher, USN DD laid down 1941

Displacement:
   2,400 t light; 2,532 t standard; 2,806 t normal; 3,026 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (376.50 ft / 369.00 ft) x 39.67 ft x (13.45 / 14.21 ft)
   (114.76 m / 112.47 m) x 12.09 m  x (4.10 / 4.33 m)

Armament:
      5 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 420 per gun
     Dual purpose guns in deck and hoist mounts, 1941 Model
     5 x Single mounts on centreline ends, majority aft
      2 raised mounts - superfiring
      2 - 1.57" / 40.0 mm 56.0 cal guns - 2.12lbs / 0.96kg shells, 2,000 per gun
     Anti-air guns in deck mount, 1941 Model
     1 x Twin mount on centreline, forward deck aft
      6 - 0.79" / 20.0 mm 70.0 cal guns - 0.26lbs / 0.12kg shells, 2,000 per gun
     Machine guns in deck mounts, 1941 Model
     2 x Single mounts on sides, aft deck centre
     2 x Twin mounts on sides, forward deck centre
      2 raised mounts
      Weight of broadside 302 lbs / 137 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.13" / 3 mm   0.13" / 3 mm      0.13" / 3 mm

   - Box over machinery & magazines:
   0.50" / 13 mm
   Forecastle: 0.50" / 13 mm  Quarter deck: 0.50" / 13 mm

   - Conning towers: Forward 0.75" / 19 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 60,263 shp / 44,956 Kw = 35.10 kts
   Range 4,364nm at 15.00 kts
   Bunker at max displacement = 494 tons

Complement:
   192 - 250

Cost:
   £1.868 million / $7.471 million

Distribution of weights at normal displacement:
   Armament: 74 tons, 2.6 %
      - Guns: 74 tons, 2.6 %
   Armour: 229 tons, 8.2 %
      - Armament: 4 tons, 0.2 %
      - Armour Deck: 221 tons, 7.9 %
      - Conning Tower: 3 tons, 0.1 %
   Machinery: 1,383 tons, 49.3 %
   Hull, fittings & equipment: 491 tons, 17.5 %
   Fuel, ammunition & stores: 406 tons, 14.5 %
   Miscellaneous weights: 223 tons, 7.9 %
      - On freeboard deck: 216 tons
      - Above deck: 7 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     544 lbs / 247 Kg = 8.7 x 5.0 " / 127 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.08
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 13.9 seconds
   Steadiness   - As gun platform (Average = 50 %): 37 %
         - Recoil effect (Restricted arc if above 1.00): 0.23
   Seaboat quality  (Average = 1.00): 0.30

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and large transom stern
   Block coefficient (normal/deep): 0.499 / 0.509
   Length to Beam Ratio: 9.30 : 1
   'Natural speed' for length: 22.05 kts
   Power going to wave formation at top speed: 72 %
   Trim (Max stability = 0, Max steadiness = 100): 91
   Bow angle (Positive = bow angles forward): 19.00 degrees
   Stern overhang: 0.55 ft / 0.17 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  20.17 ft / 6.15 m,  14.79 ft / 4.51 m
      - Forward deck:   30.00 %,  14.79 ft / 4.51 m,  9.41 ft / 2.87 m
      - Aft deck:   35.00 %,  9.41 ft / 2.87 m,  7.61 ft / 2.32 m
      - Quarter deck:   15.00 %,  7.61 ft / 2.32 m,  7.61 ft / 2.32 m
      - Average freeboard:      11.14 ft / 3.39 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 169.4 %
      - Above water (accommodation/working, high = better): 102.2 %
   Waterplane Area: 10,132 Square feet or 941 Square metres
   Displacement factor (Displacement / loading): 73 %
   Structure weight / hull surface area: 35 lbs/sq ft or 172 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.51
      - Longitudinal: 0.68
      - Overall: 0.52
   Cramped machinery, storage, compartmentation space
   Adequate accommodation and workspace room
   Caution: Lacks seaworthiness - very limited seakeeping ability

Geared +10% range = 4800 nm @ 15 kn

7t: FCS
40t: 2x5 21" torps
160t: 4 sets of reloads for 21" torps

2t: 2 DC throwers
14t: 28 DCs + 14 mobilization allowance

From archive.org/embed/usdestroyersillu0000frie


Scheme 10-C generally being the Fletcher

Overall I'm content with the cruiser rules.  I would like small transom to be added for DDs as that was becoming a thing circa WW1

Interesting Logi, I had no idea about the hull equations differing like that.
Actually saves me some planned work as I was going to try to sim some USN DD designs and see how they fit out system.

For Brooklyn, the 'transom, small' seems to produce good results,
as it would with this Aresthusa.

However, one of the key points to me is that this historical design
does not work under our current 0.75@3000 or 0.9@8000 tech points

I'd like to find another vessel in this tonnage range with good info and validate that, or perhaps use some of the USN design studies for smaller cruisers.

Meanwhile I'm still trying to figure out if Brooklyn's belt was the magazine box & thin side over machinery of the early USN cruisers, or the magazine box plus 5" belt you find later. Friedman's just not terribly clear, sounds like the change was made with the New Orlean's class, in which case the latter. Now home, I can check some other sources.

Springsharp uses Holtren-Mennen to predict resistance and propulsive power. H&M doesn't really work for Fn > 0.45, LB > 9.5, or Cp < 0.55. As designed, Aresthusa is pretty close to the limit there with Fn 0.4345, Cp,est ~ 0.62, LB 9.41.

In general, it's not good for small, slender, and fast vessels. Which is why it basically doesn't work for destroyers and barely works here for Aresthusa. H&M is also for displacement-mode ships and I suspect destroyers and light cruisers vastly exceeding hull speed were operating in semi-displacement mode instead - although the produced lift was small. Many destroyers had rather V-shaped bottoms after all due to the fineness of their lines.

Here the hull speed is 29.36 kn and so the mismatch wouldn't be as large. I don't remember how SS3 calculated the transom stern effect, but I'm inclined to think it was a hack given it's not well understood even today and side-stepped via CFD.

So I would understand the use of "transom stern" in SS as a way to make up for H&M's shortcomings rather than an indication of whether the hull actually uses a transom stern.

So this is my attempt at the HMS Aresthusa, exploring where the 0.75 cap should be.

This illustrates Option #3.

It seems close enough to the real ship to be a plausible SIM,
and would suggest the tech support a 0.75 at 5,000t allowance

Option 1 - use SHP to determine BC
The supporting information on the ship is problematic.
32.5knts with 64,000shp allow determining the BC.
1325 tons of fuel oil is listed....and for the British fleet speed of 14knots
works out to 10,230nm.

The range is a bit irrelevant, the tons of fuel oil should be right
and would effect light displacement and standard displacement.

world-war.co.uk  puts the tonnage at 5220 std, 6665 full load.

With this fuel loading it has 5229 Normal- maybe a mix up
but 4493 Std. and 4282 Light. So way off. .

And the Comp Str. Does not work out.

option 2- use alternative range
Elsewhere is listed 5300nm at 13 knots-
But that pushes the standard displacement  to 4892-still low, and max disp. is far to low.

The Comp Str. is near correct at 0.73.


option 3- adjust BC to get right 5220 Std displacement, freeboard for 1.0+, then 1325 oil fuel

This gets us near the right max disp, and near the right standard,
while using the right fuel loading, and a reasonable range result.

5300nm & 18knots would take 1387tons fuel. -62 tons more.
Very close.

My guess is a handwritten 5300@18 was mis-copied at 5300@18.

The SHP is too high now, 72,000 vs. 64,000. 
A small Transom nearly fixes things, 0.75comp str, 1.0 seakeeping
SHP 66,374 instead of 64,000 ...but all the plans show a cruiser stern.

Perhaps it only made 32 on trials at overload of 72,000,
while 31.1 knots gets 64,000shp for normal speed?
Comp St. is 0.79 for 31.1

QuoteAresthusa, Enter country Enter ship type laid down 1934

Displacement:
    4,939 t light; 5,164 t standard; 5,934 t normal; 6,550 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
    (480.00 ft / 480.00 ft) x 51.00 ft x (14.00 / 15.20 ft)
    (146.30 m / 146.30 m) x 15.54 m  x (4.27 / 4.63 m)

Armament:
      6 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 200 per gun
      Quick firing guns in deck and hoist mounts, 1934 Model
      3 x 2-gun mounts on centreline ends, majority forward
        1 raised mount - superfiring
      8 - 4.00" / 102 mm 45.0 cal guns - 32.28lbs / 14.64kg shells, 200 per gun
      Dual purpose guns in deck and hoist mounts, 1934 Model
      4 x 2-gun mounts on sides, evenly spread
      16 - 0.50" / 12.7 mm 90.0 cal guns - 0.07lbs / 0.03kg shells, 2,000 per gun
      Anti-air guns in deck mounts, 1934 Model
      4 x 4 row quad mounts on side ends, evenly spread
        4 raised mounts
      Weight of broadside 945 lbs / 429 kg

Armour:
  - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    2.25" / 57 mm    182.00 ft / 55.47 m    18.36 ft / 5.60 m
    Ends:    Unarmoured
    Upper:    2.25" / 57 mm      50.85 ft / 15.50 m    12.71 ft / 3.87 m
      Main Belt covers 58 % of normal length
      Main belt does not fully cover magazines and engineering spaces

  - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    1.00" / 25 mm    1.00" / 25 mm        1.00" / 25 mm
    2nd:    1.00" / 25 mm          -                  -
    3rd:    1.00" / 25 mm          -                  -

  - Armoured deck - single deck:
    For and Aft decks: 1.28" / 33 mm
    Forecastle: 1.00" / 25 mm  Quarter deck: 1.00" / 25 mm

Machinery:
    Oil fired boilers, steam turbines,
    Geared drive, 4 shafts, 72,156 shp / 53,829 Kw = 32.00 kts
    Range 5,300nm at 18.00 kts
    Bunker at max displacement = 1,387 tons

Complement:
    337 - 439

Cost:
    £2.755 million / $11.019 million

Distribution of weights at normal displacement:
    Armament: 280 tons, 4.7 %
      - Guns: 280 tons, 4.7 %
    Armour: 913 tons, 15.4 %
      - Belts: 453 tons, 7.6 %
      - Armament: 46 tons, 0.8 %
      - Armour Deck: 414 tons, 7.0 %
    Machinery: 2,076 tons, 35.0 %
    Hull, fittings & equipment: 1,563 tons, 26.3 %
    Fuel, ammunition & stores: 995 tons, 16.8 %
    Miscellaneous weights: 107 tons, 1.8 %
      - On freeboard deck: 54 tons
      - Above deck: 53 tons

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      3,735 lbs / 1,694 Kg = 34.6 x 6.0 " / 152 mm shells or 0.8 torpedoes
    Stability (Unstable if below 1.00): 1.31
    Metacentric height 2.9 ft / 0.9 m
    Roll period: 12.5 seconds
    Steadiness    - As gun platform (Average = 50 %): 51 %
            - Recoil effect (Restricted arc if above 1.00): 0.39
    Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
    Hull has rise forward of midbreak,
      a ram bow and a cruiser stern
    Block coefficient (normal/deep): 0.606 / 0.616
    Length to Beam Ratio: 9.41 : 1
    'Natural speed' for length: 21.91 kts
    Power going to wave formation at top speed: 64 %
    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 (% = length of deck as a percentage of waterline length):
                Fore end,    Aft end
      - Forecastle:    20.00 %,  27.00 ft / 8.23 m,  24.00 ft / 7.32 m
      - Forward deck:    38.00 %,  24.00 ft / 7.32 m,  22.00 ft / 6.71 m
      - Aft deck:    29.50 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
      - Quarter deck:    12.50 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
      - Average freeboard:        19.66 ft / 5.99 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 129.0 %
        - Above water (accommodation/working, high = better): 194.0 %
    Waterplane Area: 18,005 Square feet or 1,673 Square metres
    Displacement factor (Displacement / loading): 97 %
    Structure weight / hull surface area: 59 lbs/sq ft or 286 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.64
        - Longitudinal: 1.34
        - Overall: 0.69
    Caution: Hull subject to strain in open-sea
    Cramped machinery, storage, compartmentation space
    Excellent accommodation and workspace room

Warning: Beam between bulkheads too wide

The Aresthusa is my trial at what displacement the 0.75 / 0.9 break should be.

Option 1 - use SHP to determine BC
The supporting information on the ship is problematic.
32.5knts with 64,000shp allow determining the BC.
1325 tons of fuel oil is listed....and for the British fleet speed of 14knots
works out to 10,230nm.

The range is a bit irrelevant, the tons of fuel oil should be right
and would effect light displacement and standard displacement.

world-war.co.uk  puts the tonnage at 5220 std, 6665 full load.

With this fuel loading it has 5229 Normal- maybe a mix up
but 4493 Std. and 4282 Light. So way off. .

And the Comp Str. Does not work out.

option 2- use alternative range
Elsewhere is listed 5300nm at 13 knots-
But that pushes the standard displacement  to 4892-still low, and max disp. is far to low.

The Comp Str. is near correct at 0.73.


option 3- adjust BC to get right 5220 Std displacement, freeboard for 1.0+, then 1325 oil fuel

This gets us near the right max disp, and near the right standard,
while using the right fuel loading, and a reasonable range result.

5300nm & 18knots would take 1387tons fuel. -62 tons more.
Very close.

My guess is a handwritten 5300@18 was mis-copied at 5300@18.

The SHP is too high now, 72,000 vs. 64,000. 
A small Transom nearly fixes things, 0.75comp str, 1.0 seakeeping
SHP 66,374 instead of 64,000 ...but all the plans show a cruiser stern.

Perhaps it only made 32 on trials at overload of 72,000,
while 31.1 knots gets 64,000shp for normal speed?
Comp St. is 0.79 for 31.1






The Armor scheme is quite problematic.
The 1" deck/gun protection is clear.
The magazines had 1-3" protection... ok Magazine box, but how much 1", how much 3" ?

The plan shows the deck raised amidships and a big patch of 2.25" belt armor there. About the same height as draft
amid ships, and with a strake aft, but not all along the waterline.
I wound up taking a image to Paint and counting the armor area to
figure the bet area, splitting the two strakes to the main and upper belts.


SS gives a Machinery length of 426.20 ft.
We know that destroyers, and over-engined ships like the Lexington BCs, had engines above the WL.

I am guessing this was the case here, that the engines extended above the WL,
and so they put a patch of armor on the sides and raised the armor deck 2 levels.
While fore/aft the deck was a protective deck and the  magazines were under the protective deck with 3" sides

So you wind up with the Armor belt being about 16ft high forward, 8ft aft, for an average of 125


Misc Wt
28    FC
25    LR Radio

5t    Paravanes
24    2TT3 21" 34

20t  Floatplane
5t    Catapult


Armor :
308 armor deck 1"
71  magazine box 3"

Rather than keep cluttering the tech thread, I thought I'd put these here.

The goal is to model real-world ships as close as we can, to see what can be done within the confines of our current rules, and where we might consider tech for help.

Others who have reference material that gives them hints like block coefficient, width of belt, tons of fuel oil, etc ... feel free to add.

Others, feel free to comment :)

This has been quiet for a couple days, so I'll try to write a considered post tomorrow (Weds) to move the conversation forward :)

The addition of transoms to the ruleset is being considered along with other 1930 techs. As part of that I put together the best sim of Brooklyn that I could determine. The weird USN cruiser belt designs is proving problematic, Well, to be fair the HMS Aresthusa is proving difficult to model- but the hull shape/shp definitely points to the 'transom, small'setting. 

I've started my journey towards a Brooklyn-style vessel with 165mm & 115mm with heavyweight shells, the Poulsek Class. Only 8,000 tons with Mount & Hoist to fit inside our cruiser rules, but 32knots and a broadside of 8 x 165mm, but a forward fire of 8x165mm as well !


As for Quad turrets, in this iteration, I decided to explore them. Normally I like Two-gun and Three-gun ships.
But most 'Parthian' capital ships are sporting Four-Gun Quads now. 
For cruisers, there is substantial benefit to falling under the 'cruiser rules'  and using M&H.
Rotating weight argues against triples and quads with M&H if I want the mounts armored, which I do.
So no Quads in that size range - yet.

I like quads for a lot of things but am not using them in this iteration of the sim.

Nice to see you, hope all's well.

Royn "Oil" Class, Parthian Fleet Oiler

AO - 1  Laid 1931.0
AO - 2  Laid 1931.5

QuoteDisplacement:
   14,880 t light; 15,585 t standard; 16,861 t normal; 17,883 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (462.37 ft / 452.76 ft) x 90.55 ft x (21.33 / 22.44 ft)
   (140.93 m / 138.00 m) x 27.60 m  x (6.50 / 6.84 m)

Armament:
      4 - 4.72" / 120 mm 43.0 cal guns - 55.12lbs / 25.00kg shells, 300 per gun
     Dual purpose guns in deck mounts, 1929 Model
     2 x 2-gun mounts on centreline ends, evenly spread
      12 - 1.18" / 30.0 mm 80.0 cal guns - 55.12lbs / 25.00kg shells, 900 per gun
     Dual purpose guns in deck and hoist mounts, 1929 Model
     4 x 2-gun mounts on side ends, evenly spread
     2 x 2-gun mounts on centreline ends, evenly spread
      2 raised mounts
      Weight of broadside 882 lbs / 400 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.31" / 8 mm         -               -
   2nd:   0.31" / 8 mm         -               -

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 20,259 shp / 15,113 Kw = 19.21 kts
   Range 5,595nm at 16.00 kts
   Bunker at max displacement = 2,298 tons

Complement:
   739 - 961

Cost:
   £2.697 million / $10.790 million

Distribution of weights at normal displacement:
   Armament: 47 tons, 0.3 %
      - Guns: 47 tons, 0.3 %
   Armour: 7 tons, 0.0 %
      - Armament: 7 tons, 0.0 %
   Machinery: 606 tons, 3.6 %
   Hull, fittings & equipment: 3,925 tons, 23.3 %
   Fuel, ammunition & stores: 1,981 tons, 11.8 %
   Miscellaneous weights: 10,295 tons, 61.1 %
      - Hull below water: 10,141 tons
      - Hull void weights: 44 tons
      - Hull above water: 40 tons
      - On freeboard deck: 40 tons
      - Above deck: 30 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     32,601 lbs / 14,788 Kg = 618.3 x 4.7 " / 120 mm shells or 3.0 torpedoes
   Stability (Unstable if below 1.00): 2.91
   Metacentric height 20.8 ft / 6.3 m
   Roll period: 8.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 100 %
         - Recoil effect (Restricted arc if above 1.00): 0.02
   Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
   Hull has raised forecastle, raised quarterdeck ,
     a ram bow and a round stern
   Block coefficient (normal/deep): 0.675 / 0.680
   Length to Beam Ratio: 5.00 : 1
   'Natural speed' for length: 21.28 kts
   Power going to wave formation at top speed: 49 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 15.00 degrees
   Stern overhang: 3.28 ft / 1.00 m
   Freeboard (% = length of deck as a percentage of waterline length):
            Fore end,    Aft end
      - Forecastle:   20.00 %,  23.62 ft / 7.20 m,  23.62 ft / 7.20 m
      - Forward deck:   30.00 %,  15.42 ft / 4.70 m,  15.42 ft / 4.70 m
      - Aft deck:   30.00 %,  15.42 ft / 4.70 m,  15.42 ft / 4.70 m
      - Quarter deck:   20.00 %,  23.62 ft / 7.20 m,  23.62 ft / 7.20 m
      - Average freeboard:      18.70 ft / 5.70 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 80.8 %
      - Above water (accommodation/working, high = better): 127.7 %
   Waterplane Area: 32,130 Square feet or 2,985 Square metres
   Displacement factor (Displacement / loading): 145 %
   Structure weight / hull surface area: 95 lbs/sq ft or 465 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.95
      - Longitudinal: 1.56
      - 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

Royn "Oil" is a naval auxiliary tanker.

Designed to be able to fit in the merchant docks in the Pacific, max of 141m.
Designed with a shallow draf to fit almost any port, military or civilian.

This fleet oiler auxiliary is meant to be able to keep up with the battleline over strategic spaces.   Maximum speed is designed to let it cruise on 1/2power.
7553*2 = 15106hp needed

Range IS 5595 *1.15 = 6434

Tonnage is meant to complete within 2 years, and
tt 15,000 tons, it takes 24 months to completion.
But can be launched after 9.6 months, allowing docks to be prepped for the next vessel.

Maximum displacement would be 11 months in dock +1 to clear the dock, which would be
11/0.4 = 27.5 months
27.5-9 = 18.5 = 18,500 tons light disp.

While there are economies of scale with larger vessels,
that also makes their loss more difficult.

With 10,000 tons of bunker oil, any two battleships can fully refuel from one tanker.


Ams & Armor
Normal : 17036 * 0.02 = 340t arms & armor
Guns & Armor : 54
Torpedo nets : 141

Total : 195

Misc Wt :
44t - Reserves

AD
  5t - FC 1930
25t - LR Radio
  0t - SR Radio

OD
40t - 2x 20t Motor launches

HAW
25t - Add Fire Suppresion gear
15t - CO2 Compressor AC

HBW
141t - Torpedo Nets
10,000 - Fuel Oil for Replenishment