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