CL Nueva class - coal to oil

[Jefgte]

The most changement is the conversion coal to oil for the engines.
The free tonnage is use for minor modifications.

1920
-90%coal to 100%oil
-6" :add - mount & hoist
- add 40mm belt
- 4x18" TT removed
- 6x21" TT add

Nueva Class-1920, NUS Light Cruiser laid down 1910 (Engine 1909)

Displacement:
   4 614 t light; 4 783 t standard; 5 428 t normal; 5 944 t full load

Dimensions: Length overall / water x beam x draught
   393.00 ft / 393.00 ft x 56.00 ft x 18.14 ft (normal load)
   119.79 m / 119.79 m x 17.07 m  x 5.53 m

Armament:
      2 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1910 Model
     Quick firing guns in deck mounts with hoists
     on centreline ends, evenly spread
      4 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1910 Model
     Quick firing guns in deck mounts with hoists
     on side, evenly spread
      4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1910 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread, all raised mounts
      4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1910 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 656 lbs / 298 kg
   Shells per gun, main battery: 150
   6 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.57" / 40 mm   288.71 ft / 88.00 m   8.01 ft / 2.44 m
   Ends:   1.18" / 30 mm     42.65 ft / 13.00 m   6.56 ft / 2.00 m
     61.64 ft / 18.79 m Unarmoured ends
     Main Belt covers 113 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.00" / 51 mm   2.00" / 51 mm            -
   2nd:   2.00" / 51 mm   2.00" / 51 mm            -
   3rd:   0.79" / 20 mm         -               -
   4th:   0.50" / 13 mm         -               -

   - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 36 000 shp / 26 856 Kw = 26.99 kts
   Range 7 000nm at 12.00 kts
   Bunker at max displacement = 1 161 tons

Complement:
   316 - 411

Cost:
   £0.459 million / $1.838 million

Distribution of weights at normal displacement:
   Armament: 82 tons, 1.5 %
   Armour: 796 tons, 14.7 %
      - Belts: 164 tons, 3.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 61 tons, 1.1 %
      - Armour Deck: 531 tons, 9.8 %
      - Conning Tower: 40 tons, 0.7 %
   Machinery: 1 636 tons, 30.1 %
   Hull, fittings & equipment: 1 939 tons, 35.7 %
   Fuel, ammunition & stores: 815 tons, 15.0 %
   Miscellaneous weights: 160 tons, 2.9 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5 715 lbs / 2 592 Kg = 52.9 x 6.0 " / 152 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.24
   Metacentric height 3.1 ft / 0.9 m
   Roll period: 13.4 seconds
   Steadiness   - As gun platform (Average = 50 %): 67 %
         - Recoil effect (Restricted arc if above 1.00): 0.23
   Seaboat quality  (Average = 1.00): 1.18

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.476
   Length to Beam Ratio: 7.02 : 1
   'Natural speed' for length: 19.82 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   Bow angle (Positive = bow angles forward): -14.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      23.00 ft / 7.01 m
      - Forecastle (18 %):   23.00 ft / 7.01 m
      - Mid (50 %):      23.00 ft / 7.01 m (14.75 ft / 4.50 m aft of break)
      - Quarterdeck (18 %):   14.75 ft / 4.50 m
      - Stern:      14.75 ft / 4.50 m
      - Average freeboard:   18.88 ft / 5.75 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 113.0 %
      - Above water (accommodation/working, high = better): 132.6 %
   Waterplane Area: 14 352 Square feet or 1 333 Square metres
   Displacement factor (Displacement / loading): 111 %
   Structure weight / hull surface area: 84 lbs/sq ft or 408 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.56
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
@26,7kts ; Good seaboat, rides out heavy weather easily

----------------------------------------------------

Actualy SS
new armament in 1918
10x4" removed
4x6" addNueva Class-1918, NUS Light Cruiser laid down 1910 (Engine 1909)

Displacement:
   4 400 t light; 4 569 t standard; 5 428 t normal; 6 116 t full load

Dimensions: Length overall / water x beam x draught
   393.00 ft / 393.00 ft x 56.00 ft x 18.14 ft (normal load)
   119.79 m / 119.79 m x 17.07 m  x 5.53 m

Armament:
      2 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1910 Model
     Quick firing guns in deck mounts
     on centreline ends, evenly spread
      4 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1910 Model
     Quick firing guns in deck mounts
     on side, evenly spread
      4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1910 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread, all raised mounts
      4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1910 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 656 lbs / 298 kg
   Shells per gun, main battery: 150
   4 - 18.0" / 457.2 mm above water torpedoes

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.00" / 51 mm   2.00" / 51 mm            -
   2nd:   2.00" / 51 mm   2.00" / 51 mm            -
   3rd:   0.50" / 13 mm         -               -

   - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
   Coal and oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 36 000 shp / 26 856 Kw = 26.99 kts
   Range 7 000nm at 12.00 kts
   Bunker at max displacement = 1 546 tons (90% coal)

Complement:
   316 - 411

Cost:
   £0.472 million / $1.890 million

Distribution of weights at normal displacement:
   Armament: 82 tons, 1.5 %
   Armour: 632 tons, 11.6 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 61 tons, 1.1 %
      - Armour Deck: 531 tons, 9.8 %
      - Conning Tower: 40 tons, 0.7 %
   Machinery: 1 782 tons, 32.8 %
   Hull, fittings & equipment: 1 794 tons, 33.0 %
   Fuel, ammunition & stores: 1 029 tons, 18.9 %
   Miscellaneous weights: 110 tons, 2.0 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5 342 lbs / 2 423 Kg = 49.5 x 6.0 " / 152 mm shells or 1.0 torpedoes
   Stability (Unstable if below 1.00): 1.40
   Metacentric height 3.8 ft / 1.2 m
   Roll period: 12.1 seconds
   Steadiness   - As gun platform (Average = 50 %): 71 %
         - Recoil effect (Restricted arc if above 1.00): 0.11
   Seaboat quality  (Average = 1.00): 1.25

Hull form characteristics:
   Hull has rise forward of midbreak
   Block coefficient: 0.476
   Length to Beam Ratio: 7.02 : 1
   'Natural speed' for length: 19.82 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   Bow angle (Positive = bow angles forward): -14.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      23.00 ft / 7.01 m
      - Forecastle (18 %):   23.00 ft / 7.01 m
      - Mid (50 %):      23.00 ft / 7.01 m (14.75 ft / 4.50 m aft of break)
      - Quarterdeck (18 %):   14.75 ft / 4.50 m
      - Stern:      14.75 ft / 4.50 m
      - Average freeboard:   18.88 ft / 5.75 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 120.5 %
      - Above water (accommodation/working, high = better): 148.3 %
   Waterplane Area: 14 352 Square feet or 1 333 Square metres
   Displacement factor (Displacement / loading): 109 %
   Structure weight / hull surface area: 77 lbs/sq ft or 378 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.90
      - Longitudinal: 2.52
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Ship has slow, easy roll, a good, steady gun platform
   Good seaboat, rides out heavy weather easily

[Jefgte]

SS CALCULATION
Armament: 0
   Armour:
      - Belts: +164 tons,
      - Torpedo bulkhead: 0
      - Armament: 0
      - Armour Deck: 0
      - Conning Tower: 0
   Machinery: -146 tons,
   Hull, fittings & equipment: +145 tons,
   Fuel, ammunition & stores: -214 tons,
   Miscellaneous weights: +60 tons,

Cost CALCULATION
Base Cost of Rebuild - 20% of Original cost & 10% of Original BP:
4400t x 0.20 & 4400t x 0.10: $0.88 and 0.44BP
Armor : +164T
Machinery:-146T
Hull, fittings & equipment: +145T
Fuel, ammunition & stores:-214T
Total: -51T

So: 4400T to 4614T
0.43$ &0.216BP
0.88$ & 0.44BP
Total cost
$1.31 and 0.65BP

[Guinness]

So what's changing? I think changes include:

- Change from mostly coal to oil firing, which makes machinery weight go down.
- Change from deck mounts to mount and hoist, which reflects in "hull, fittings and equipment"
- Change in bunkerage weight, which reflects in fuel, etc.
- Add belt armor
- Update torpedos

When calculating what one of these costs, one should pay for everything new that is being put in. One may optionally credit themselves for the scrap value of anything taken off.

In this case, nothing is being scrapped (at least as I understand it), but rather you are adding:
145 tons of hull weight
164 tons of armor

and subtracting:
214 tons of fuel
146 tons of machinery weight (resultant of conversion from Coal to Oil).

So, you are essentially trading machinery weight (coaling gear and whatnot) for new hull weight (I assume hoists, etc.). We shouldn't be doing that. Whatever you take off the ship can be reused if it makes sense, or sold for scrap at the going rate (25%). So you can credit yourself for the machinery weight to the tune of $0.0365 and 0.0365BP.

You'll also need to pay for the added hull weight and the rules say that is a function of the change to light displacement: 4614 - 4400 = 214 tons, costing $0.428 and 0.428BP. Still I think we wrote that rule to account for *changes* to the hull itself. Since this isn't really a hull change, I think it makes more sense to just calculate those costs based on the weight of the change, which is 145 tons, and treating it like armament and machinery, making the cost $0.29 and 0.145BP.

Armor is straightforward: $0.164 and 0.164BP.

I've been treating fuel changes as free (since we buy ships light anyway), so no add or subtract there since ammunition load hasn't changed.

Torpedos, take those 4 tons worth of torpedos and scrap them, but add 12 tons of torpedos, so 12 - (4/4) = 11 tons added, or $0.0011 and 0.0022BP.

So that gives me:

Refurb base cost: $0.88 and 0.44BP
Machinery: ($0.0365 and 0.0365BP)
Hull, etc.: $0.29 and 0.145BP
Armor: $0.164 and 0.164BP
Torpedos: $0.0011 and 0.0022BP

Total: $1.2986 and 0.7147BP, or rounded to the nearest hundredth, $1.30 and 0.71BP.

I really need to do a javascript based calculator of some sort for this...

[P3D]

If you just change the engine to oil firing, it means you REPLACE the whole machinery with a new one - that's 1.6BP. And that's a refurbishment, you can change armor and armament.

If you do it on the cheap, keep the sim as is - some of the misc weight would represent oil pipes and burners. Keep it at 90% coal. Note the bunkerage weight. Tho get actual range, resim with 100% oil firing, and change range until the bunkerage matches the previou one.

[miketr]

I thought it was possible to convert a ship to oil fired from coal without new boilers?  I certainly see no reason to replace the entire machinery setup.  Turbines, etc don't care what the steam source is after all.

Its not how I did some of my conversions either.

Michael

[Sachmle]

If you do it on the cheap, keep the sim as is - some of the misc weight would represent oil pipes and burners. Keep it at 90% coal. Note the bunkerage weight. Tho get actual range, resim with 100% oil firing, and change range until the bunkerage matches the previou one.

That's assuming that a coal bunker that's 100ft long and 10ft wide/tall hold the same weight of oil as it does coal. Isn't it more likely, since oil is liquid, the same space would hold more oil, which is also more efficient, therefore the bunkerage and the range would increase?

[P3D]

Mike:
No need to replace the whole machinery, but the "coal fired" should not be changed in the sim, as it decreases the engine weight.


Sachmle:
Broken coal has a specific density somewhere between 0.8 and 1.1 (bitumunous to anthracite). Bunker oil has density slightly below 1.0, depending on specifications. I'd say not a difference to worry about.

If you need to relocate (most of the) fuel storage, I'd argue you need a refurbishment to get it done right, anyways.

[Jefgte]

Guinness wrote:

Total: $1.2986 and 0.7147BP, or rounded to the nearest hundredth, $1.30 and 0.71BP.

& Jef wrote:
Total cost
$1.31 and 0.65BP

:D  :D  :D very good calculation Jef  ;)
------------------------------------

Well,

Some remarks

Like I wrote, it is a conversion of the boilers from coal to oil.
I remember to have see this work when I was young...  ::)  ::)  ::)
The interior of the boiler was cover by a packaging of fire-clay bricks.

New torpedoes are counted in the misc weight, similar to all SS for all ships.

It's logical to add simply the weight of the new splinters belt.

The difference calculation between the 2 SS is simply & realist too.
---------------------------------------
I understand the cost in $, for the refurbishement or rebuilt & I agree perfectly to add 20% of the cost of the ship for the time & the work in the shipyards. But I disagree the cost add in BP.
The cruiser was 4400t & is now 4614t - that SS calculations
Difference 214t

How could we count 440t (0.44BP) for the work in the shipyards?
I know... that is the weight of the boilers fire-clay bricks & the watertightness of the coal bunkerage !!!

Jef

[Jefgte]

The  difference of the 2 SS, the old & the new must be the absolute calculation reference.

OLD - 4400t
Distribution of weights at normal displacement:
  Armament: 82 tons, 1.5 %
  Armour: 632 tons, 11.6 %
     - Belts: 0 tons, 0.0 %
     - Torpedo bulkhead: 0 tons, 0.0 %
     - Armament: 61 tons, 1.1 %
     - Armour Deck: 531 tons, 9.8 %
     - Conning Tower: 40 tons, 0.7 %
  Machinery: 1 782 tons, 32.8 %
  Hull, fittings & equipment: 1 794 tons, 33.0 %
  Fuel, ammunition & stores: 1 029 tons, 18.9 %
  Miscellaneous weights: 110 tons, 2.0 %

NEW - 4614t
Distribution of weights at normal displacement:
  Armament: 82 tons, 1.5 %
  Armour: 796 tons, 14.7 %
     - Belts: 164 tons, 3.0 %
     - Torpedo bulkhead: 0 tons, 0.0 %
     - Armament: 61 tons, 1.1 %
     - Armour Deck: 531 tons, 9.8 %
     - Conning Tower: 40 tons, 0.7 %
  Machinery: 1 636 tons, 30.1 %
  Hull, fittings & equipment: 1 939 tons, 35.7 %
  Fuel, ammunition & stores: 815 tons, 15.0 %
  Miscellaneous weights: 160 tons, 2.9 %

Jef

[Delta Force]

I know that things in game are different than in real life, but typically light cruisers of this era had a quoted expected lifespan of 12 years in active service. Not sure why you would being conducting boiler conversions on something that ought to be retired from service and placed in the ready reserve, scraped, or sold.

[P3D]

I know that things in game are different than in real life, but typically light cruisers of this era had a quoted expected lifespan of 12 years in active service. Not sure why you would being conducting boiler conversions on something that ought to be retired from service and placed in the ready reserve, scraped, or sold.

That lifespan is distorted by the German cruisers scuttled at Scapa Flow, and supernumerary RN cruisers scrapped in the 1920s - ome ships of the Arethusa class were scrapped 8 years after laying down. And that does not even consider wartime losses.

[Jefgte]

Sure Jef....

If I made a strong rebuilt with 0.9BP each, that mean;
0.9x6 = 5400t The displacement of just 1 emergency cruiser !!!

& I have 6 correct CLs for 20 years again...

[Jefgte]

Nueva Class-1918, NUS Light Cruiser laid down 1910 (Engine 1909)

Displacement:
   4 720 t light; 4 910 t standard; 5 565 t normal; 6 089 t full load

Dimensions: Length overall / water x beam x draught
   393.00 ft / 393.00 ft x 56.00 ft x 18.59 ft (normal load)
   119.79 m / 119.79 m x 17.07 m  x 5.67 m

Armament:
      4 - 6.00" / 152 mm guns (2x2 guns), 108.00lbs / 48.99kg shells, 1910 Model
     Quick firing guns in deck mounts with hoists
     on centreline ends, evenly spread
      4 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1910 Model
     Quick firing guns in deck mounts with hoists
     on side, evenly spread
      4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1910 Model
     Anti-aircraft guns in deck mounts
     on side, evenly spread, all raised mounts
      4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1910 Model
     Machine guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 872 lbs / 396 kg
   Shells per gun, main battery: 150
   6 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   1.57" / 40 mm   291.99 ft / 89.00 m   7.87 ft / 2.40 m
   Ends:   Unarmoured
     Main Belt covers 114 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   2.00" / 51 mm   2.00" / 51 mm            -
   2nd:   2.00" / 51 mm   2.00" / 51 mm            -
   3rd:   0.50" / 13 mm         -               -

   - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 35 956 shp / 26 824 Kw = 26.89 kts
   Range 7 000nm at 12.00 kts
   Bunker at max displacement = 1 178 tons

Complement:
   321 - 418

Cost:
   £0.486 million / $1.942 million

Distribution of weights at normal displacement:
   Armament: 109 tons, 2.0 %
   Armour: 798 tons, 14.3 %
      - Belts: 151 tons, 2.7 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 75 tons, 1.3 %
      - Armour Deck: 531 tons, 9.5 %
      - Conning Tower: 41 tons, 0.7 %
   Machinery: 1 634 tons, 29.4 %
   Hull, fittings & equipment: 2 031 tons, 36.5 %
   Fuel, ammunition & stores: 845 tons, 15.2 %
   Miscellaneous weights: 148 tons, 2.7 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5 573 lbs / 2 528 Kg = 51.6 x 6.0 " / 152 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 3.0 ft / 0.9 m
   Roll period: 13.6 seconds
   Steadiness   - As gun platform (Average = 50 %): 69 %
         - Recoil effect (Restricted arc if above 1.00): 0.31
   Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
   Hull has raised forecastle, rise forward of midbreak
   Block coefficient: 0.476
   Length to Beam Ratio: 7.02 : 1
   'Natural speed' for length: 19.82 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 57
   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:      26.51 ft / 8.08 m
      - Forecastle (18 %):   26.52 ft / 8.08 m (22.54 ft / 6.87 m aft of break)
      - Mid (50 %):      22.54 ft / 6.87 m (14.29 ft / 4.36 m aft of break)
      - Quarterdeck (18 %):   14.29 ft / 4.36 m
      - Stern:      14.29 ft / 4.36 m
      - Average freeboard:   19.13 ft / 5.83 m

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 113.5 %
      - Above water (accommodation/working, high = better): 127.4 %
   Waterplane Area: 14 352 Square feet or 1 333 Square metres
   Displacement factor (Displacement / loading): 109 %
   Structure weight / hull surface area: 86 lbs/sq ft or 422 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.89
      - Longitudinal: 2.73
      - Overall: 1.00
   Hull space for machinery, storage, compartmentation is cramped
   Room for accommodation and workspaces is excellent
   Good seaboat, rides out heavy weather easily




Nueva class - 90%Coal + 10%Oil
1918
4400T – 90%coal
Distribution of weights at normal displacement:
   Armament: 82 tons, 1.5 %
   Armour: 632 tons, 11.6 %
      - Belts: 0 tons, 0.0 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 61 tons, 1.1 %
      - Armour Deck: 531 tons, 9.8 %
      - Conning Tower: 40 tons, 0.7 %
   Machinery: 1 782 tons, 32.8 %
   Hull, fittings & equipment: 1 794 tons, 33.0 %
   Fuel, ammunition & stores: 1 029 tons, 18.9 %
   Miscellaneous weights: 110 tons, 2.0 %
1920
4720T – 100% oil - 2M2x6"+4M1x6"+ Belt + 1 seaplane
Distribution of weights at normal displacement:
   Armament: 109 tons, 2.0 %
   Armour: 798 tons, 14.3 %
      - Belts: 151 tons, 2.7 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 75 tons, 1.3 %
      - Armour Deck: 531 tons, 9.5 %
      - Conning Tower: 41 tons, 0.7 %
   Machinery: 1 634 tons, 29.4 %
   Hull, fittings & equipment: 2 031 tons, 36.5 %
   Fuel, ammunition & stores: 845 tons, 15.2 %
   Miscellaneous weights: 148 tons, 2.7 %
Calculation
Armament: +27
   Armour:
      - Belts: +151 tons,
      - Torpedo bulkhead: 0
      - Armament: +14 tons
      - Armour Deck: 0
      - Conning Tower: 0
   Machinery: -148 tons,
   Hull, fittings & equipment: +237 tons,
   Fuel, ammunition & stores: -184tons,
   Miscellaneous weights: +38 tons,
FINAL Calculation
Base Cost of Rebuild - 25% of Original cost & 10% of Original BP:
4400t x 0.20 & 4400t x 0.10: +$0.88 and +0.44BP
Armor : +151T:  +0.151$ & +0.151BP
Machinery:-148T: -0.022$ &-0.022BP
Hull, fittings & equipment: +237T: + 0.474$ & +0.237BP
Misc Weight:+38t :+ 0.038$ & +0.038BP
Fuel, ammunition & stores:-184T :-0.028$ &-0.028BP
add: 4400T to 4720T : +0.32BP & +0.32$Total cost
$1.813 and 1.156BP

[Jefgte]

4600t rebuilt with new oil boilers, 2M2x6" & Without the belt

All in tons	before	after	differences	Tons rules differences	$ rules differences
Displacement Standart	4400	4600	200	200	0.2
distribution weight armament
Armament	82	109	27	27	0.027
Armour belt	0	0	0
Torpedo bulkhead	0	0	0
Armament	61	75	14	14	0.014
Armour Deck	531	531	0
Conning Tower	40	40	0
Machinery	1782	1636	-146
Hull fittings & equipement	1794	2047	253	253	0.506	cost=tonsx2
Fuel, Ammunition & stores	1029	833	-196
Miscellaneous weight	110	162	52	52	0.52
Total basic rebuilt in tons				546	1.267
Basic rebuilt BP				0.546
Basic rebuilt $					1.267
Add Shipyards cost
Original BP	original BP x 0.1			0.44
Original cost $	original cost x 0.2				0.88
Total with Shipyards cost				BP 0.986	$ 2.147

That's good, I hope to have just 1BP rebuilt -

[Jefgte]

Drawing of the 4600t rebuilt - 1BP & 2.15$



before rebuilt




Jef