WesWorld

Repository for data pertaining to the subject. Includes:

Frigates
Corvettes
Sloops (formerly coast guard)

(Historical data)

Design work on sloops has been underway for the better part of two years, as Peru grapples with the need to police its rich fisheries and patrol its lengthy shoreline without diverting its relatively small quantity of destroyers and torpedo-boats to such roles.

The Rio class sloops were to undertake this role for the Marina, and are instead expected to do so as the core of a new Coast Guard. The class is sufficiently armed to function as an escort along the coast, but also has boats and extra accommodation to allow for prolonged fisheries inspection duties.

Rio Ucayali, laid down 1942 - Scrapped 1949
Rio Putumayo, laid down 1942
Rio Urubamba, laid down 1943
Rio Huallaga, laid down 1943
Rio Yavari, laid down 1944

Rio, Peruvian sloop, laid down 1942

Displacement: 1,000 t light; 1,053 t standard; 1,228 t normal; 1,367 t full load

Dimensions: Length overall / water x beam x draught

254.30 ft / 250.66 ft x 29.86 ft x 11.48 ft (normal load) [77.51 m / 76.40 m x 9.10 m x 3.50 m]

Armament:

2 - 4.13" / 105 mm guns (1x2 guns), 35.32lbs / 16.02kg shells, 1942 Model Dual purpose guns in a deck mount with hoist on centerline forward
2 - 4.13" / 105 mm guns (1x2 guns), 35.32lbs / 16.02kg shells, 1942 Model Dual purpose guns in a deck mount with hoist on centerline aft, all raised guns - superfiring
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1942 Model Anti-aircraft guns in deck mounts on side, evenly spread
6 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model Anti-aircraft guns in deck mounts on side, evenly spread
4 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1942 Model Machine guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 149 lbs / 68 kg
Shells per gun, main battery: 300

Armor:

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
2nd: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm
3rd: 0.79" / 20 mm - -
4th: 0.39" / 10 mm - -

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 12,236 shp / 9,128 Kw = 24.76 kts
Range 5,000nm at 15.00 kts (Bunkerage = 314 tons)

Complement: 103 - 134

Cost: £0.607 million / $2.429 million

Distribution of weights at normal displacement:

Armament: 19 tons, 1.5 %
Armor: 15 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 15 tons, 1.2 %
- Armor Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 320 tons, 26.0 %
Hull, fittings & equipment: 536 tons, 43.7 %
Fuel, ammunition & stores: 228 tons, 18.5 %
Miscellaneous weights: 110 tons, 9.0 %
-20 t: Accommodation for 10 fisheries officers or marines
-20 t: Two additional 5 t boats plus davits
-20 t: Boom for minesweeping/trawling/salvage
-16 t: 48 DC + rails and throwers
-14 t: Weight reserve
-10 t: ASDIC

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,432 lbs / 650 Kg = 40.5 x 4.1 " / 105 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 1.24

Hull form characteristics:

Hull has rise forward of midbreak
Block coefficient: 0.500
Length to Beam Ratio: 8.40: 1
'Natural speed' for length: 15.83 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.67 ft / 6.30 m
- Forecastle (20 %): 17.72 ft / 5.40 m
- Mid (50 %): 17.72 ft / 5.40 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 14.02 ft / 4.27 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 107.6 %
- Above water (accommodation/working, high = better): 124.3 %
Waterplane Area: 4,986 Square feet or 463 Square meters
Displacement factor (Displacement / loading): 134 %
Structure weight / hull surface area: 51 lbs/sq ft or 249 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.85
- Longitudinal: 5.48
- Overall: 1.02
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Maranon, Peruvian Corvette laid down 1945

Displacement: 512 t light; 537 t standard; 669 t normal; 774 t full load

Dimensions: Length overall / water x beam x draught

239.07 ft / 229.66 ft x 24.61 ft x 8.20 ft (normal load) [72.87 m / 70.00 m x 7.50 m x 2.50 m]

Armament:

2 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1945 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1945 Model Anti-aircraft guns in deck mount on centreline amidships, all raised guns - superfiring
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1945 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 47 lbs / 21 kg
Shells per gun, main battery: 400

Armour:

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

Conning tower: 0.98" / 25 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 7,541 shp / 5,626 Kw = 25.00 kts
Range 3,800nm at 18.00 kts
Bunker at max displacement = 237 tons

Complement: 65 - 85

Cost: £0.342 million / $1.368 million

Distribution of weights at normal displacement:

Armament: 6 tons, 0.9 %
Armour: 5 tons, 0.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 4 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 190 tons, 28.5 %
Hull, fittings & equipment: 260 tons, 39.0 %
Fuel, ammunition & stores: 157 tons, 23.4 %
Miscellaneous weights: 50 tons, 7.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 784 lbs / 356 Kg = 37.7 x 3.5 " / 88 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 0.8 ft / 0.2 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 74 %
- Recoil effect (Restricted arc if above 1.00): 0.18
Seaboat quality (Average = 1.00): 1.85

Hull form characteristics:

Hull has rise forward of midbreak and transom stern
Block coefficient: 0.505
Length to Beam Ratio: 9.33: 1
'Natural speed' for length: 17.38 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.86 ft / 5.75 m
- Forecastle (20 %): 18.04 ft / 5.50 m
- Mid (50 %): 18.04 ft / 5.50 m (11.48 ft / 3.50 m aft of break)
- Quarterdeck (20 %): 11.48 ft / 3.50 m
- Stern: 11.48 ft / 3.50 m
- Average freeboard: 14.83 ft / 4.52 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 108.7 %
- Above water (accommodation/working, high = better): 170.2 %
Waterplane Area: 3,934 Square feet or 365 Square metres
Displacement factor (Displacement / loading): 138 %
Structure weight / hull surface area: 26 lbs/sq ft or 128 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.57
- Longitudinal: 7.69
- Overall: 0.74
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of miscellaneous weight:

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


Vessel -|- Laid Down -|- Launched -|- Completed
Corvette Maranon -|- 1-Jan-45 -|- 1-May-45 -|- 13-Oct-45
Corvette Clavero -|- 1-Jan-45 -|- 1-May-45 -|- 13-Oct-45
Corvette Castilla -|- 1-Jun-45 -|- 29-Sep-45 -|- 13-Mar-46
Corvette Velarde -|- 1-Jun-45 -|- 29-Sep-45 -|- 13-Mar-46

Galindo, Peruvian Frigate laid down 1946

Displacement: 1,645 t light; 1,741 t standard; 2,054 t normal; 2,304 t full load

Dimensions: Length overall / water x beam x draught

354.32 ft / 344.49 ft x 36.09 ft x 12.30 ft (normal load) [108.00 m / 105.00 m x 11.00 m x 3.75 m]

Armament:

4 - 4.13" / 105 mm guns (2x2 guns), 35.32lbs / 16.02kg shells, 1946 Model Dual purpose guns in deck mounts with hoists on centerline ends, evenly spread
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1946 Model Anti-aircraft guns in deck mounts on side, evenly spread, 2 raised mounts
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1946 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 155 lbs / 70 kg
Shells per gun, main battery: 600
6 - 21.0" / 533 mm above water torpedoes

Armor:

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

Conning tower: 0.98" / 25 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 25,985 shp / 19,385 Kw = 30.00 kts
Range 5,000nm at 18.00 kts
Bunker at max displacement = 563 tons

Complement:

152 - 198

Cost: £1.168 million / $4.671 million

Distribution of weights at normal displacement:

Armament: 19 tons, 0.9 %
Armor: 14 tons, 0.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 11 tons, 0.5 %
- Armor Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.2 %
Machinery: 649 tons, 31.6 %
Hull, fittings & equipment: 863 tons, 42.0 %
Fuel, ammunition & stores: 409 tons, 19.9 %
Miscellaneous weights: 100 tons, 4.9 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,134 lbs / 968 Kg = 60.4 x 4.1 " / 105 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.27
Seaboat quality (Average = 1.00): 1.44

Hull form characteristics:

Hull has rise forward of midbreak and transom stern
Block coefficient: 0.470
Length to Beam Ratio: 9.55: 1
'Natural speed' for length: 21.34 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 49
Bow angle (Positive = bow angles forward): 22.00 degrees
Stern overhang: 0.82 ft / 0.25 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.31 ft / 6.80 m
- Forecastle (20 %): 21.00 ft / 6.40 m
- Mid (50 %): 21.00 ft / 6.40 m (14.44 ft / 4.40 m aft of break)
- Quarterdeck (22 %): 14.44 ft / 4.40 m
- Stern: 14.44 ft / 4.40 m
- Average freeboard: 17.82 ft / 5.43 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 117.4 %
- Above water (accommodation/working, high = better): 125.1 %
Waterplane Area: 8,381 Square feet or 779 Square metres
Displacement factor (Displacement / loading): 131 %
Structure weight / hull surface area: 49 lbs/sq ft or 238 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.72
- Longitudinal: 4.38
- Overall: 0.87
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

Breakdown of miscellaneous weight:

Anti-submarine detection equipment (ASDIC/Sonar) - 25 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- 23 tons


Galindo – Laid down 1 January 1946; Launched 31 May 1946; Completed 17 November 1946
Gaetano – Laid down 1 January 1946; Launched 31 May 1946; Completed 17 November 1946
Catalano – Laid down 1 July 1946; Launched 28 November 1946; Completed 17 May 1947
Chunchoa – Laid down 1 July 1946; Launched 28 November 1946; Completed 17 May 1947
Canseco – Laid down 1 January 1947; Launched 31 May 1947; Completed 17 Nov 1947
Prado – Laid down 1 July 1947; Launched 28 November 1947; Completed 16 May 1948
Cáceres – Laid down 1 January 1948; Launched 30 May 1948; Completed 16 November 1948
Olaya – Laid down 1 January 1948; Launched 30 May 1948; Completed 16 November 1948

Huancabamba, Peruvian Corvette laid down 1948

Displacement: 860 t light; 908 t standard; 1,062 t normal; 1,185 t full load

Dimensions: Length overall / water x beam x draught

270.50 ft / 262.47 ft x 33.14 ft x 8.20 ft (normal load) [82.45 m / 80.00 m x 10.10 m x 2.50 m]

Armament:

4 - 3.46" / 88.0 mm guns (2x2 guns), 20.79lbs / 9.43kg shells, 1948 Model Anti-aircraft guns in deck mounts with hoists on centerline ends, evenly spread
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1948 Model Anti-aircraft guns in deck mounts on centerline ends, evenly spread, all raised mounts
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1948 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 90 lbs / 41 kg
Shells per gun, main battery: 500

Armor:

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

Conning tower: 0.98" / 25 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 11,695 shp / 8,725 Kw = 25.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 277 tons

Complement: 92 - 120

Cost: £0.593 million / $2.374 million

Distribution of weights at normal displacement:

Armament: 11 tons, 1.1 %
Armor: 11 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 9 tons, 0.8 %
- Armor Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 286 tons, 26.9 %
Hull, fittings & equipment: 452 tons, 42.6 %
Fuel, ammunition & stores: 202 tons, 19.0 %
Miscellaneous weights: 100 tons, 9.4 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,361 lbs / 617 Kg = 65.4 x 3.5 " / 88 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.1 ft / 0.3 m
Roll period: 13.0 seconds
Steadiness - As gun platform (Average = 50 %): 76 %
- Recoil effect (Restricted arc if above 1.00): 0.25
Seaboat quality (Average = 1.00): 1.43

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.521
Length to Beam Ratio: 7.92: 1
'Natural speed' for length: 16.20 kts
Power going to wave formation at top speed: 66 %
Trim (Max stability = 0, Max steadiness = 100): 53
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.69 ft / 6.00 m
- Forecastle (20 %): 18.04 ft / 5.50 m
- Mid (50 %): 14.76 ft / 4.50 m
- Quarterdeck (20 %): 14.76 ft / 4.50 m
- Stern: 14.76 ft / 4.50 m
- Average freeboard: 16.04 ft / 4.89 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 108.0 %
- Above water (accommodation/working, high = better): 190.6 %
Waterplane Area: 5,908 Square feet or 549 Square meters
Displacement factor (Displacement / loading): 137 %
Structure weight / hull surface area: 38 lbs/sq ft or 188 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.67
- Longitudinal: 5.03
- Overall: 0.82
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
Breakdown of Miscellaneous Weight

Provision for radar and other electronics - 15 tons
Provision for tropicalization - 15 tons
Antisubmarine detection equipment (ASDIC/Sonar) - 10 tons
Two depth charge racks for 100 kg depth charges - 20 tons
Four depth charge projectors for 100 kg depth charges - 5 tons each - 20 tons
Two hundred depth charges - 20 tons


Huancabamba – Laid down 1 July 1948; Launched 29 October 1948; Completed 23 April 1949
Zarumila – Laid down 1 July 1948; Launched 29 October 1948; Completed 23 April 1949
Tahuamanu - Laid down 1 January 1949; Launched 1 May 1949; Completed 24 October 1949
Inambari - Laid down 1 January 1949; Launched 1 May 1949; Completed 24 October 1949
Ayabaca - Laid down 1 July 1949; Launched 29 October 1949
Chulucanas - Laid down 1 July 1949; Launched 29 October 1949
Piscobamba - Laid down 1 January 1950
Yanahuanca - Laid down 1 January 1950