WesWorld

To address the difficulties of movement in the region of Loreto and the upper Amazon, Peru plans to construct the following types of craft. The Lancha de desembarco de Infanteria is primarily a troop carrier, to be used by the Batallóns de Infantería de Marina Fluvial of the Infantería de Marina del Perú; the Lancha de desembarco de Apoyo is a support vessel on the same hull.

(Note: Design based upon the Fairmile Type H)


Lancha de desembarco de Infanteria

Displacement: 63 tons (light) 100 tons (loaded)
Length: 32.03 meters
Beam: 6.50 meters
Draught: 0.86 meters (forward), 1.12 meters (aft) (loaded)
Propulsion: Two 1,500 hp supercharged diesel engines. Twin screws.
Speed: 15 knots maximum, 13.25 knots
Range: 330 nm (610 km) at 15 knots; 700 nm at 12.5 knots.
Complement: Crew: 2 officers and 15 men with accommodation.
Troops: 6 officers and 96 men fully equipped below deck.
Armament: 2 × 20 mm autocannon, 2 x 7.65mm machineguns.
Armor: 10mm plating to deck sides, gun positions, generator house and forward bulkhead


Lancha de desembarco de Apoyo

Displacement: 63 tons (light) 100 tons (loaded)
Length: 32.03 meters
Beam: 6.50 meters
Draught: 0.86 meters (forward), 1.12 meters (aft) (loaded)
Propulsion: Two 1,500 hp supercharged diesel engines. Twin screws.
Speed: 15 knots maximum, 13.25 knots
Range: 330 nm (610 km) at 15 knots; 700 nm at 12.5 knots.
Complement: Crew: 2 officers and 30 men with accommodation.
Armament: 1 × 37 mm antiaircraft gun, 1 x 81mm mortar, 2 x 7.65mm machineguns.
Armor: 15mm plating to deck sides, gun positions, generator house and forward bulkhead

Peru is also considering a service life extension refit of the heavy cruiser Callao. Submitted for peer review.

Callao (II), Peruvian Heavy Cruiser laid down 1939

Displacement: 10,833 t light; 11,273 t standard; 12,247 t normal; 13,026 t full load

Dimensions: Length overall / water x beam x draught

649.91 ft / 623.36 ft x 62.34 ft (Bulges 63.98 ft) x 20.67 ft (normal load) [ 198.09 m / 190.00 m x 19.00 m (Bulges 19.50 m) x 6.30 m]

Armament:

6 - 8.00" / 203 mm guns (2x3 guns), 256.00lbs / 116.12kg shells, 1931 Model Breech loading guns in turrets (on barbettes) on centreline, all forward, 1 raised mount - superfiring
12 - 4.72" / 120 mm guns (6x2 guns), 52.72lbs / 23.91kg shells, 1939 Model Dual purpose guns in deck mounts with hoists on side, all amidships, 2 raised mounts - superfiring
16 - 1.46" / 37.0 mm guns (4x4 guns), 1.55lbs / 0.70kg shells, 1939 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 2,193 lbs / 995 kg
Shells per gun, main battery: 150
8 - 23.6" / 600 mm above water torpedoes

Armour:

Belts: Width (max) Length (avg) Height (avg)
Main: 4.92" / 125 mm 405.18 ft / 123.50 m 9.84 ft / 3.00 m
Ends: 1.18" / 30 mm 213.25 ft / 65.00 m 8.20 ft / 2.50 m
4.92 ft / 1.50 m Unarmoured ends
Main Belt covers 100 % of normal length

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 7.99" / 203 mm 4.49" / 114 mm 7.99" / 203 mm
2nd: 1.97" / 50 mm 0.98" / 25 mm 0.98" / 25 mm
3rd: 0.79" / 20 mm - -

Armour deck: 2.36" / 60 mm, Conning tower: 5.91" / 150 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 4 shafts, 82,693 shp / 61,689 Kw = 32.00 kts
Range 12,000nm at 12.00 kts
Bunker at max displacement = 1,752 tons

Complement: 581 - 756

Cost: £5.367 million / $21.468 million

Distribution of weights at normal displacement:

Armament: 274 tons, 2.2 %
Armour: 2,772 tons, 22.6 %
- Belts: 894 tons, 7.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 611 tons, 5.0 %
- Armour Deck: 1,199 tons, 9.8 %
- Conning Tower: 68 tons, 0.6 %
Machinery: 2,237 tons, 18.3 %
Hull, fittings & equipment: 5,040 tons, 41.2 %
Fuel, ammunition & stores: 1,414 tons, 11.5 %
Miscellaneous weights: 510 tons, 4.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 18,502 lbs / 8,392 Kg = 72.4 x 8.0 " / 203 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 2.9 ft / 0.9 m
Roll period: 15.6 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.53
Seaboat quality (Average = 1.00): 1.21

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.520
Length to Beam Ratio: 9.74 : 1
'Natural speed' for length: 28.48 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 46
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 16.40 ft / 5.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.89 ft / 8.50 m
- Forecastle (20 %): 24.61 ft / 7.50 m
- Mid (50 %): 20.18 ft / 6.15 m
- Quarterdeck (25 %): 20.18 ft / 6.15 m
- Stern: 20.18 ft / 6.15 m
- Average freeboard: 21.99 ft / 6.70 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 81.8 %
- Above water (accommodation/working, high = better): 157.8 %
Waterplane Area: 27,435 Square feet or 2,549 Square metres
Displacement factor (Displacement / loading): 123 %
Structure weight / hull surface area: 114 lbs/sq ft or 556 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.54
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Major Refit (25%)

Service life extension; modify aviation facilities and reduce the number of aircraft carried; add radar; remove 20mm batteries; increase miscellaneous weight (to account for radar)

Breakdown of Miscellaneous Weights:

Add Radar - Surface Search and Navigation - 20 tons
Add Radar - Air Search and AA Fire Control - 20 tons
Add Radar - Surface Fire Control - 10 tons

Communications and flagship facilities - 100 tons
Heavy crane - 20 tons
Aviation maintenance facilities - 40 tons
Catapults - 150 tons
Six Float Reconnaissance Aircraft - 150 tons

Cost: 2,708 tons
Time: 149 days

Peru is also considering a refit of the cruiser Almirante Grau. Submitted for peer review.

Almirante Grau, Peruvian Heavy Cruiser laid down 1934

Displacement: 14,339 t light; 15,151 t standard; 16,682 t normal; 17,907 t full load

Dimensions: Length overall / water x beam x draught

704.84 ft / 685.99 ft x 74.02 ft x 23.00 ft (normal load) [214.84 m / 209.09 m x 22.56 m x 7.01 m]

Armament:

9 - 10.00" / 254 mm guns (3x3 guns), 500.00lbs / 226.80kg shells, 1934 Model Breech loading guns in turrets (on barbettes) on centerline ends, majority forward, 1 raised mount - superfiring
18 - 4.72" / 120 mm guns (6x3 guns), 52.72lbs / 23.91kg shells, 1934 Model Dual purpose guns in turrets (on barbettes) on side, all amidships, 2 raised mounts - superfiring
32 - 1.46" / 37.0 mm guns (8x4 guns), 1.55lbs / 0.70kg shells, 1934 Model Anti-aircraft guns in deck mounts on side, evenly spread, 4 raised mounts
Weight of broadside 5,499 lbs / 2,494 kg
Shells per gun, main battery: 150
8 - 23.6" / 600 mm above water torpedoes

Armor:

Belts: Width (max) Length (avg) Height (avg)
Main: 5.91" / 150 mm 387.50 ft / 118.11 m 9.84 ft / 3.00 m
Ends: Unarmored
Main Belt covers 87 % of normal length
Main belt does not fully cover magazines and engineering spaces

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.91" / 150 mm 3.94" / 100 mm 4.92" / 125 mm
2nd: 1.97" / 50 mm 0.98" / 25 mm 1.97" / 50 mm
3rd: 0.79" / 20 mm - -

Armor deck: 2.76" / 70 mm, Conning tower: 3.94" / 100 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 96,176 shp / 71,747 Kw = 32.00 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 2,756 tons

Complement: 733 - 954

Cost: £7.200 million / $28.798 million

Distribution of weights at normal displacement:

Armament: 687 tons, 4.1 %
Armor: 3,630 tons, 21.8 %
- Belts: 966 tons, 5.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 815 tons, 4.9 %
- Armor Deck: 1,794 tons, 10.8 %
- Conning Tower: 55 tons, 0.3 %
Machinery: 2,767 tons, 16.6 %
Hull, fittings & equipment: 7,135 tons, 42.8 %
Fuel, ammunition & stores: 2,343 tons, 14.0 %
Miscellaneous weights: 120 tons, 0.7 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 21,013 lbs / 9,531 Kg = 42.0 x 10.0 " / 254 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 3.8 ft / 1.2 m
Roll period: 15.9 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.64
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.500
Length to Beam Ratio: 9.27: 1
'Natural speed' for length: 30.07 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 60
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 4.99 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.02 ft / 7.32 m
- Forecastle (25 %): 18.01 ft / 5.49 m
- Mid (50 %): 18.01 ft / 5.49 m
- Quarterdeck (15 %): 18.01 ft / 5.49 m
- Stern: 18.01 ft / 5.49 m
- Average freeboard: 18.61 ft / 5.67 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 86.9 %
- Above water (accommodation/working, high = better): 142.0 %
Waterplane Area: 35,180 Square feet or 3,268 Square meters
Displacement factor (Displacement / loading): 113 %
Structure weight / hull surface area: 142 lbs/sq ft or 691 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.13
- Overall: 1.01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Refit Changes: (Level 2 Minor Refit)

Remove 25mm AA battery
Add Radar - Surface Search and Navigation - 20 tons
Add Radar - Air Search and AA Fire Control - 20 tons
Add Radar - Surface Fire Control - 10 tons
Update gun directors

Cost: 2,150 tons
Time: 105 days

Peru will refit the battlecruiser Almirante Villar, installing a radar suite of Dutch origin. Submitted for peer review.

Almirante Villar, Peruvian Light Battleship laid down 1936

Displacement: 22,800 t light; 23,985 t standard; 25,944 t normal; 27,510 t full load

Dimensions: Length overall / water x beam x draught

742.30 ft / 721.78 ft x 82.02 ft x 27.89 ft (normal load) [226.25 m / 220.00 m x 25.00 m x 8.50 m]

Armament:

8 - 12.01" / 305 mm guns (2x4 guns), 865.70lbs / 392.68kg shells, 1936 Model Breech loading guns in turrets (on barbettes) on centerline ends, evenly spread
8 - 4.72" / 120 mm guns (4x2 guns), 52.72lbs / 23.92kg shells, 1936 Model Dual purpose guns in deck mounts with hoists on centerline ends, evenly spread, all raised mounts - superfiring
8 - 4.72" / 120 mm guns (4x2 guns), 52.72lbs / 23.92kg shells, 1936 Model Dual purpose guns in deck mounts with hoists on side, evenly spread
16 - 1.46" / 37.0 mm guns (8x2 guns), 1.55lbs / 0.70kg shells, 1936 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
16 - 0.79" / 20.0 mm guns (8x2 guns), 0.24lbs / 0.11kg shells, 1936 Model Machine guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 7,798 lbs / 3,537 kg
Shells per gun, main battery: 150

Armor:

Belts: Width (max) Length (avg) Height (avg)
Main: 11.8" / 300 mm 469.16 ft / 143.00 m 10.86 ft / 3.31 m
Ends: Unarmored
Main Belt covers 100 % of normal length

Torpedo Bulkhead: 1.57" / 40 mm 469.16 ft / 143.00 m 25.59 ft / 7.80 m

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 13.8" / 350 mm 7.87" / 200 mm 11.8" / 300 mm
2nd: 1.18" / 30 mm 0.79" / 20 mm 1.18" / 30 mm
3rd: 1.18" / 30 mm - -
4th: 0.79" / 20 mm - -
5th: 0.79" / 20 mm - -

Armor deck: 3.94" / 100 mm, Conning tower: 13.78" / 350 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 4 shafts, 127,343 shp / 94,998 Kw = 32.03 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 3,525 tons

Complement: 1,021 - 1,328

Cost: £11.162 million / $44.649 million

Distribution of weights at normal displacement:

Armament: 975 tons, 3.8 %
Armor: 8,058 tons, 31.1 %
- Belts: 2,540 tons, 9.8 %
- Torpedo bulkhead: 700 tons, 2.7 %
- Armament: 1,426 tons, 5.5 %
- Armor Deck: 3,133 tons, 12.1 %
- Conning Tower: 260 tons, 1.0 %
Machinery: 3,573 tons, 13.8 %
Hull, fittings & equipment: 10,044 tons, 38.7 %
Fuel, ammunition & stores: 3,144 tons, 12.1 %
Miscellaneous weights: 150 tons, 0.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 37,272 lbs / 16,906 Kg = 43.1 x 12.0 " / 305 mm shells or 5.2 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 4.4 ft / 1.4 m
Roll period: 16.3 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.66
Seaboat quality (Average = 1.00): 1.09

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.550
Length to Beam Ratio: 8.80: 1
'Natural speed' for length: 30.79 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 29.86 ft / 9.10 m
- Forecastle (20 %): 22.31 ft / 6.80 m
- Mid (50 %): 22.31 ft / 6.80 m
- Quarterdeck (15 %): 22.31 ft / 6.80 m
- Stern: 22.31 ft / 6.80 m
- Average freeboard: 22.91 ft / 6.98 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 99.2 %
- Above water (accommodation/working, high = better): 179.0 %
Waterplane Area: 43,014 Square feet or 3,996 Square meters
Displacement factor (Displacement / loading): 112 %
Structure weight / hull surface area: 157 lbs/sq ft or 769 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.37
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Refit Scheme -

Add surface search, air search, and fire control radars - 150 tons

Cost – 1,140 tons
Time – 48 days

Correct me if I'm wrong, but I'm pretty sure the 120mm secondary guns on the Almirante Grau are actually those wacky "twins simmed as triples" thing. Would it be possible to fix that with the re-simmed ship, perhaps moving it to miscellaneous weight or something?

Additionally, the "Main belt does not fully cover magazines and engineering spaces" isn't on the original ship, so I suspect something fiddly's wrong with that - I'd have to look into that in more detail to figure out what it is.

I fear you will need to school me on this "twins simmed as triples" business; I am completely unfamiliar with what this is supposed to mean.

So the Grau's secondaries are simmed as eighteen 120mm guns in six triple turrets - but if I remember correctly, the ship actually has twelve 120mm guns in six twin turrets. The spare gun in each turret was simmed in as a way of showing that there was some extra play in the design for, say, extra automation equipment etc.

I think Grau is the only case of that happening to a Peruvian ship, but there are others elsewhere in WW...

Quoted from "Brockpaine"

So the Grau's secondaries are simmed as eighteen 120mm guns in six triple turrets - but if I remember correctly, the ship actually has twelve 120mm guns in six twin turrets. The spare gun in each turret was simmed in as a way of showing that there was some extra play in the design for, say, extra automation equipment etc.

I think Grau is the only case of that happening to a Peruvian ship, but there are others elsewhere in WW...

Okay - but in the original sim I do not find an reference to miscellaneous weight set aside to reflect that. Most of the misc weight pertained to the aviation facilities, and I had to play with those to find enough for the electronics. Has it been an oversight from day one?

Quoted from "BruceDuncan"

Quoted from "Brockpaine"

So the Grau's secondaries are simmed as eighteen 120mm guns in six triple turrets - but if I remember correctly, the ship actually has twelve 120mm guns in six twin turrets. The spare gun in each turret was simmed in as a way of showing that there was some extra play in the design for, say, extra automation equipment etc.

I think Grau is the only case of that happening to a Peruvian ship, but there are others elsewhere in WW...

Okay - but in the original sim I do not find an reference to miscellaneous weight set aside to reflect that. Most of the misc weight pertained to the aviation facilities, and I had to play with those to find enough for the electronics. Has it been an oversight from day one?

Looking back at the encyclopedia posts, it has as a note:

Quoted

Secondary armament = 3 X HA/LA twin turrets on each beam.
Torpedoes are mounted in 2 quad turrets, 1 to each beam

So the commentary is there. The guns are twins, but they've been simmed as triple mounts...

Basically, to fix it, just re-sim the ship with 12x120mm secondaries in 6x2 configuration, and then add in the miscellaneous weight you'd gain.

I mean, this isn't a really big deal, since you've got the note already in the encyclopedia, and you're not changing the guns during the proposed refit. It's just that Grau is the only ship simmed in this fashion.

Quoted

Basically, to fix it, just re-sim the ship with 12x120mm secondaries in 6x2 configuration, and then add in the miscellaneous weight you'd gain.

Actually it is slightly more complicated than that. The magazine weight is based off shells for those 18 secondary guns so you would have to find some way to replace the weight of the 6x(IIRC) 180 120mm rounds that you would loose by simming the armament as 12 guns instead of 18. Sure you could ignore that as the change in magazine would be covered by the refit, but Peru is a poor nation and I doubt they would do something like wasting 6 precious tons (or so) extra on the refit.

Quoted

So the commentary is there. The guns are twins, but they've been simmed as triple mounts...

Basically, to fix it, just re-sim the ship with 12x120mm secondaries in 6x2 configuration, and then add in the miscellaneous weight you'd gain.

Oh. *That's* what that note meant. I couldn't fathom the meaning. And by fixing it I gain some misc weight, rather than losing more. I misunderstood your original intent. I'll work on it.

I have followed your suggestion and have noted the 120mm battery as only twelve guns in six twin mounts. This makes a minor change in the power plant requirements and eliminates the anomalous “Main belt does not fully cover magazines and engineering spaces” comment.

However, it does increase the overall hull strength value from 1.01 to 1.04, and increases the light tonnage figure from 14,339 to 14,371. It also increases the stability from 1.10 to 1.11 – which comes as no surprise.

Have I missed something? Or should I allow some values to drift in order to correct the ‘triples’ comment? If so, which?

Its a tricky business correcting these kinds of design issues. I'd be happy to accept the slightly higher hull strength and stability and the extra 32 tons is not much to lose sleep over either. You could pay in an extra 32 tons in the refit report if it bothers you, but the difference isn't that big.

Well, to show the initial results in total, here is a quick sim of how the refit would look now. Any further thoughts?

Quoted

Almirante Grau, Peruvian Heavy Cruiser laid down 1934

Displacement:
14,371 t light; 15,151 t standard; 16,682 t normal; 17,907 t full load

Dimensions: Length overall / water x beam x draught
704.84 ft / 685.99 ft x 74.02 ft x 23.00 ft (normal load)
214.84 m / 209.09 m x 22.56 m x 7.01 m

Armament:
9 - 10.00" / 254 mm guns (3x3 guns), 500.00lbs / 226.80kg shells, 1934 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
12 - 4.72" / 120 mm guns (6x2 guns), 52.72lbs / 23.91kg shells, 1934 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships, 3 raised mounts - superfiring
32 - 1.46" / 37.0 mm guns (8x4 guns), 1.55lbs / 0.70kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 5,182 lbs / 2,351 kg
Shells per gun, main battery: 150
8 - 23.6" / 600 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5.91" / 150 mm 387.50 ft / 118.11 m 9.84 ft / 3.00 m
Ends: Unarmoured
Main Belt covers 87 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.91" / 150 mm 3.94" / 100 mm 4.92" / 125 mm
2nd: 1.97" / 50 mm 0.98" / 25 mm 1.97" / 50 mm
3rd: 0.79" / 20 mm - -

- Armour deck: 2.76" / 70 mm, Conning tower: 3.94" / 100 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 96,176 shp / 71,747 Kw = 32.00 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 2,756 tons

Complement:
733 - 954

Cost:
£7.042 million / $28.168 million

Distribution of weights at normal displacement:
Armament: 648 tons, 3.9 %
Armour: 3,599 tons, 21.6 %
- Belts: 966 tons, 5.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 783 tons, 4.7 %
- Armour Deck: 1,794 tons, 10.8 %
- Conning Tower: 55 tons, 0.3 %
Machinery: 2,767 tons, 16.6 %
Hull, fittings & equipment: 7,238 tons, 43.4 %
Fuel, ammunition & stores: 2,311 tons, 13.9 %
Miscellaneous weights: 120 tons, 0.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
21,497 lbs / 9,751 Kg = 43.0 x 10.0 " / 254 mm shells or 2.4 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 3.9 ft / 1.2 m
Roll period: 15.8 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.61
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.500
Length to Beam Ratio: 9.27 : 1
'Natural speed' for length: 30.07 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 60
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 4.99 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.02 ft / 7.32 m
- Forecastle (25 %): 18.01 ft / 5.49 m
- Mid (50 %): 18.01 ft / 5.49 m
- Quarterdeck (15 %): 18.01 ft / 5.49 m
- Stern: 18.01 ft / 5.49 m
- Average freeboard: 18.61 ft / 5.67 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 85.1 %
- Above water (accommodation/working, high = better): 142.0 %
Waterplane Area: 35,180 Square feet or 3,268 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 144 lbs/sq ft or 701 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 1.15
- Overall: 1.04
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Refit Changes: (Level 2 Minor Refit)

Remove 25mm AA battery
Add Radar - Surface Search and Navigation - 20 tons
Add Radar - Air Search and AA Fire Control - 20 tons
Add Radar - Surface Fire Control - 10 tons
Update gun directors

Cost: 2,155 tons
Time: 105 days

I think that's good.

Meanwhile, I've been working on a refit to the Admiral's southern archnemesis!

Thanks. The increase in refit cost is almost non-existent.

Nice picture! Must be wonderful to have a stable government that keep projects going over the intervening years. I'm still running to catch up. :D

As part of the general renovation of its naval forces, Peru intends to refit the Cajamarca class light cruisers with new electronics.

Cajamarca, Peruvian Light Cruiser laid down 1938

Displacement: 9,230 t light; 9,650 t standard; 10,610 t normal; 11,378 t full load

Dimensions: Length overall / water x beam x draught

642.27 ft / 623.36 ft x 63.16 ft x 18.86 ft (normal load) [195.76 m / 190.00 m x 19.25 m x 5.75 m]

Armament:

15 - 5.91" / 150 mm guns (5x3 guns), 100.31lbs / 45.50kg shells, 1938 Model Breech loading guns in turrets (on barbettes) on centerline ends, majority forward, 2 raised mounts - superfiring
12 - 4.13" / 105 mm guns (6x2 guns), 35.32lbs / 16.02kg shells, 1928 Model Dual purpose guns in deck mounts with hoists on side, evenly spread
16 - 1.46" / 37.0 mm guns (8x2 guns), 1.55lbs / 0.70kg shells, 1929 Model Dual purpose guns in deck mounts on side, evenly spread
Weight of broadside 1,953 lbs / 886 kg
Shells per gun, main battery: 180
16 - 0.0" / 0 mm above water torpedoes, 533 - 0.0" / 0 mm submerged torpedo tubes

Armor:

Belts: Width (max) Length (avg) Height (avg)
Main: 4.72" / 120 mm 405.18 ft / 123.50 m 11.48 ft / 3.50 m
Ends: Unarmored
Main Belt covers 100 % of normal length

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.91" / 150 mm 3.11" / 79 mm 4.72" / 120 mm
2nd: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
3rd: 0.79" / 20 mm 0.39" / 10 mm -

Armor deck: 1.97" / 50 mm, Conning tower: 5.91" / 150 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 75,098 shp / 56,023 Kw = 32.00 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 1,729 tons

Complement: 522 - 679

Cost: £4.623 million / $18.493 million

Distribution of weights at normal displacement:
Armament: 249 tons, 2.3 %
Armor: 2,525 tons, 23.8 %
- Belts: 916 tons, 8.6 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 555 tons, 5.2 %
- Armor Deck: 993 tons, 9.4 %
- Conning Tower: 61 tons, 0.6 %
Machinery: 2,056 tons, 19.4 %
Hull, fittings & equipment: 4,239 tons, 40.0 %
Fuel, ammunition & stores: 1,380 tons, 13.0 %
Miscellaneous weights: 160 tons, 1.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 15,599 lbs / 7,076 Kg = 151.5 x 5.9 " / 150 mm shells or 2.0 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 3.4 ft / 1.1 m
Roll period: 14.3 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.36
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.500
Length to Beam Ratio: 9.87: 1
'Natural speed' for length: 28.52 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.07 ft / 8.25 m
- Forecastle (20 %): 17.22 ft / 5.25 m
- Mid (50 %): 17.22 ft / 5.25 m
- Quarterdeck (15 %): 17.22 ft / 5.25 m
- Stern: 17.22 ft / 5.25 m
- Average freeboard: 18.01 ft / 5.49 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 83.7 %
- Above water (accommodation/working, high = better): 171.4 %
Waterplane Area: 27,278 Square feet or 2,534 Square meters
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 106 lbs/sq ft or 519 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.03
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Catapult, two scouting aircraft, and associated handling equipment - 80 tons
Air warning radar (update) - 25 tons
Surface search radar (update) - 25 tons
Fire control radar (update) - 30 tons

During 1948 the two light cruisers of the Amazonas class are to be refitted as well.

Amazonas, Peruvian Light Cruiser laid down 1940

Displacement: 9,753 t light; 10,202 t standard; 11,664 t normal; 12,833 t full load

Dimensions: Length overall / water x beam x draught

641.79 ft / 623.36 ft x 63.98 ft x 21.33 ft (normal load) [195.62 m / 190.00 m x 19.50 m x 6.50 m]

Armament:

15 - 5.91" / 150 mm guns (5x3 guns), 102.98lbs / 46.71kg shells, 1940 Model Breech loading guns in turrets (on barbettes) on centerline ends, majority forward, 3 raised mounts - superfiring
8 - 4.13" / 105 mm guns (4x2 guns), 35.32lbs / 16.02kg shells, 1940 Model Dual purpose guns in deck mounts with hoists on side, all amidships
16 - 1.46" / 37.0 mm guns (4x4 guns), 1.55lbs / 0.70kg shells, 1940 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 1,852 lbs / 840 kg
Shells per gun, main battery: 200
16 - 21.0" / 533 mm above water torpedoes

Armor:

Belts: Width (max) Length (avg) Height (avg)
Main: 5.91" / 150 mm 405.18 ft / 123.50 m 9.51 ft / 2.90 m
Ends: Unarmored
Main Belt covers 100 % of normal length

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.91" / 150 mm 2.76" / 70 mm 4.72" / 120 mm
2nd: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
3rd: 0.79" / 20 mm 0.39" / 10 mm -

Armor deck: 2.17" / 55 mm, Conning tower: 5.91" / 150 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 4 shafts, 78,610 shp / 58,643 Kw = 32.00 kts
Range 12,000nm at 15.00 kts
Bunker at max displacement = 2,631 tons

Complement: 560 - 729

Cost: £4.980 million / $19.922 million

Distribution of weights at normal displacement:

Armament: 231 tons, 2.0 %
Armor: 2,676 tons, 22.9 %
- Belts: 949 tons, 8.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 575 tons, 4.9 %
- Armor Deck: 1,087 tons, 9.3 %
- Conning Tower: 65 tons, 0.6 %
Machinery: 2,102 tons, 18.0 %
Hull, fittings & equipment: 4,544 tons, 39.0 %
Fuel, ammunition & stores: 1,910 tons, 16.4 %
Miscellaneous weights: 200 tons, 1.7 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 17,870 lbs / 8,106 Kg = 173.5 x 5.9 " / 150 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 3.1 ft / 0.9 m
Roll period: 15.3 seconds
Steadiness - As gun platform (Average = 50 %): 61 %
- Recoil effect (Restricted arc if above 1.00): 0.42
Seaboat quality (Average = 1.00): 1.11

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.480
Length to Beam Ratio: 9.74: 1
'Natural speed' for length: 28.62 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.25 ft / 8.00 m
- Forecastle (20 %): 21.33 ft / 6.50 m
- Mid (50 %): 18.04 ft / 5.50 m
- Quarterdeck (15 %): 18.04 ft / 5.50 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 19.59 ft / 5.97 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 76.9 %
- Above water (accommodation/working, high = better): 125.6 %
Waterplane Area: 27,128 Square feet or 2,520 Square meters
Displacement factor (Displacement / loading): 131 %
Structure weight / hull surface area: 109 lbs/sq ft or 533 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.25
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent

Refit Details

Removal of 20mm battery

Installation of radar

Air warning radar - 40 tons
Surface search radar - 40 tons
Fire control radar - 60 tons

Quoted from "BruceDuncan"

Installation of radar

Air warning radar - 40 tons
Surface search radar - 40 tons
Fire control radar - 60 tons

A general comment for all these ships, but most dominantly for the Almirante Villar and the Ancash. I think you're overestimating the amount of weight you need for radar by anywhere from 200-300%. The antennas are generally the heaviest parts of the equipment, and IIRC the heaviest sets usually weigh in at 8-12,000 lbs. Right now, 140t of radar is probably equivalent to placing one or two more triple turrets on top of the ship's superstructure...

By comparison, the refitted Constitución (195% more displacement than Ancash) has 52 tons of radar. It might help you to perhaps break down the list of installed sets according to roles. I can provide a quick proposal if it would help.

It is quite probable I am over-estimating the tonnage for radar on the refits; but I haven't any good information to go on for the weights (or mass) of Dutch radars and associated equipment. I figure that it may also take into account space/weight for generator sets, CIC, and things of that sort. If I were designing vessels from the keel up I would likely be more concerned.

But if you have specific ideas to better distribute the weights I'd be happy to consider. It's not going to change the cost of the refits and it might allow me to include a couple of Inca Kola machines on the mess decks. :D