WesWorld

While I work out some of the details of Peru's naval strength - past, present, and future, this is the first design proposed to meet its needs. A rather unambitious design intended to replace the three vessels of the ex-Bharati Aripumac-class, which date back to 1917 though refitted in 1932. They are getting rather long in the tooth.

Montero, Peruvian Destroyer laid down 1945

Displacement: 1,660 t light; 1,751 t standard; 1,911 t normal; 2,039 t full load

Dimensions: Length overall / water x beam x draught

368.36 ft / 360.89 ft x 34.45 ft x 13.12 ft (normal load) [112.27 m / 110.00 m x 10.50 m x 4.00 m]

Armament:

4 - 4.72" / 120 mm guns (2x2 guns), 52.72lbs / 23.92kg shells, 1945 Model Dual purpose guns in deck mounts with hoists on centreline ends, evenly spread
8 - 1.46" / 37.0 mm guns (2x4 guns), 1.55lbs / 0.70kg shells, 1945 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, all raised mounts
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1945 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 224 lbs / 102 kg
Shells per gun, main battery: 400
10 - 21.0" / 533 mm above water torpedoes

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm 0.98" / 25 mm
2nd: 0.39" / 10 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -

Conning tower: 0.98" / 25 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 32,282 shp / 24,082 Kw = 32.50 kts
Range 4,000nm at 15.00 kts
Bunker at max displacement = 289 tons

Complement: 143 - 187

Cost: £1.344 million / $5.377 million

Distribution of weights at normal displacement:

Armament: 28 tons, 1.5 %
Armour: 15 tons, 0.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 12 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.2 %
Machinery: 807 tons, 42.2 %
Hull, fittings & equipment: 736 tons, 38.5 %
Fuel, ammunition & stores: 251 tons, 13.1 %
Miscellaneous weights: 75 tons, 3.9 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 921 lbs / 418 Kg = 17.5 x 4.7 " / 120 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 1.3 ft / 0.4 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.47
Seaboat quality (Average = 1.00): 1.43

Hull form characteristics:

Hull has rise forward of midbreak and transom stern
Block coefficient: 0.410
Length to Beam Ratio: 10.48: 1
'Natural speed' for length: 21.86 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.51 ft / 6.25 m
- Forecastle (20 %): 19.69 ft / 6.00 m
- Mid (50 %): 19.69 ft / 6.00 m (14.76 ft / 4.50 m aft of break)
- Quarterdeck (20 %): 14.76 ft / 4.50 m
- Stern: 14.76 ft / 4.50 m
- Average freeboard: 17.29 ft / 5.27 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 153.9 %
- Above water (accommodation/working, high = better): 81.9 %
Waterplane Area: 7,991 Square feet or 742 Square metres
Displacement factor (Displacement / loading): 98 %
Structure weight / hull surface area: 41 lbs/sq ft or 202 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.58
- Longitudinal: 3.64
- Overall: 0.69
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Breakdown of miscellaneous weight:

Anti-submarine detection equipment (ASDIC/Sonar) - 15 tons
Two depth charge racks for 100 kg depth charges - 10 tons each - 20 tons
Four depth charge projectors for 100 kg depth charges - 5 tons each - 20 tons
One hundred twenty depth charges (twenty attacks) - 12 tons
Navigation, surface search, and air search radar- 13 tons

I think the three Apurimac-class ships might've been sold, but I'd have to check with my friends at Agencia Nacional de Inteligencia to be sure. I don't at present have access to their classified files... ;)

Quoted from "Brockpaine"

I think the three Apurimac-class ships might've been sold, but I'd have to check with my friends at Agencia Nacional de Inteligencia to be sure. I don't at present have access to their classified files... ;)

I could find no record of their being sold; that does not say that they have not. Most of the other vessels sold to China in years past were so noted. If the Agencia Nacional de Inteligencia can shed any light on this the Direccion General de Inteligencia would be most grateful.

...Okay, ANI's last intelligence brief from Q3/1944 shows the Apurimac-class still on the books.

Since I'd helped Alvama back in the day with his reports, I just updated my spreadsheet when Rocky ran the reports. I think I did so for most of Jefgte's run as well, but not the Q4 or Q1/45 reports. I'll put it on Dropbox so you can see what I saw...

Edit: Link to spreadsheet. The main sheet was always kept up to date (until Q3/1944) checked against the posted sim reports. Everything else was updated when I remembered it, so don't take it as gospel fact...

Muchos gracias senor!

Looks a good design. The DC capacity seems a bit overkill to me but generally everything seems balanced.

Quoted from "Hood"

Looks a good design. The DC capacity seems a bit overkill to me but generally everything seems balanced.

You may be underestimating how resilient submarines can be. You should watch The Enemy Below.

Maybe, but then how much experience does the Peruvian navy have of ASW? Professional as they are, they won't be experts in all areas and I'm not sure they have had the local threat or actual combat experience to determine how hard it might be. I assume they have Bharati-sourced sonar equipment in the past.
Is this class then a DD or a DE? Right now it seems to be a classic torpedo DD but with the role of a DE, remember those DCs are going to need a lot of quarterdeck space.

Quoted from "Hood"

Maybe, but then how much experience does the Peruvian navy have of ASW? Professional as they are, they won't be experts in all areas and I'm not sure they have had the local threat or actual combat experience to determine how hard it might be.

During the Peruvian Civil War, neither half of the Peruvian Navy really had to face a submarine threat of any consequence. The Chileans only had two fleet submarines at the time, which were used according to the cruiser rules and thus accomplished nothing (aside from reporting one or two fleet sorties via radio). So IMHO the Peruvian Navy's ASW experience will still be limited to exercises. That said, the Chileans have seriously updated their submarine fleet in the last ten years, and so Peru probably has noticed and tried to compensate.