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1

Tuesday, January 17th 2017, 8:17pm

Marina de Guerra del Perú – Light Cruisers

Repository for information pertaining to the subject.

2

Tuesday, January 17th 2017, 8:22pm

Cajamarca (ex-Quechua) class Light Cruiser

(Historical data)

Cajamarca (ex-Quechua) - laid down 1938
Loreto (ex-Quito) - laid down 1939

Both ships were re-named at the end of 1941.

(Built in Germany)

Displacement: 9,228 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 centreline 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
8 - 0.79" / 20.0 mm guns (2x4 guns), 0.24lbs / 0.11kg shells, 1936 Model
Machine guns in deck mounts
on side ends, evenly spread, all raised mounts
32 - 0.79" / 20.0 mm guns (8x4 guns), 0.24lbs / 0.11kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 1,963 lbs / 890 kg
Shells per gun, main battery: 180
16 - 21.0" / 533 mm above water torpedoes

Armour:
- 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: Unarmoured
Main Belt covers 100 % of normal length

- Gun armour: 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 -
4th: 0.39" / 10 mm - -
5th: 0.39" / 10 mm - -

- Armour 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:
£4.628 million / $18.514 million

Distribution of weights at normal displacement:
Armament: 250 tons, 2.4 %
Armour: 2,513 tons, 23.7 %
- Belts: 916 tons, 8.6 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 543 tons, 5.1 %
- Armour Deck: 993 tons, 9.4 %
- Conning Tower: 61 tons, 0.6 %
Machinery: 2,056 tons, 19.4 %
Hull, fittings & equipment: 4,248 tons, 40.0 %
Fuel, ammunition & stores: 1,382 tons, 13.0 %
Miscellaneous weights: 160 tons, 1.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
15,637 lbs / 7,093 Kg = 151.8 x 5.9 " / 150 mm shells or 2.0 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 3.5 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): 83.8 %
- Above water (accommodation/working, high = better): 123.5 %
Waterplane Area: 27,278 Square feet or 2,534 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 106 lbs/sq ft or 520 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.04
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

30 tons reserved for radar
80 tons reserved for aircraft
50 tons reserved for future growth




As refitted, 1948

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

Cost to refit: 464 tons
Time to refit: 29 days

Cajamarca - Refit begun 1 January 1948, refit completed 30 January 1948
Loreto - Refit begun 1 April 1948, refit completed 30 April 1948

3

Tuesday, January 17th 2017, 8:25pm

Amazonas Class Light Cruiser

(Historical data)

Ancash, laid down 1940
Amazonas, laid down 1941

Improved and enlarged versions of previous German built light cruisers. Ancash is locally built.

Ancash, Peruvian Cruiser laid down 1940

Displacement: 9,751 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 centreline 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
40 - 0.79" / 20.0 mm guns (20x2 guns), 0.24lbs / 0.11kg shells, 1940 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 1,862 lbs / 844 kg
Shells per gun, main battery: 200
16 - 21.0" / 533.4 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5.91" / 150 mm 405.18 ft / 123.50 m 9.47 ft / 2.89 m
Ends: Unarmoured
Main Belt covers 100 % of normal length

- Gun armour: 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 -
4th: 0.39" / 10 mm - -

- Armour 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:
£4.986 million / $19.944 million

Distribution of weights at normal displacement:
Armament: 233 tons, 2.0 %
Armour: 2,673 tons, 22.9 %
- Belts: 944 tons, 8.1 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 577 tons, 4.9 %
- Armour Deck: 1,087 tons, 9.3 %
- Conning Tower: 65 tons, 0.6 %
Machinery: 2,102 tons, 18.0 %
Hull, fittings & equipment: 4,543 tons, 38.9 %
Fuel, ammunition & stores: 1,913 tons, 16.4 %
Miscellaneous weights: 200 tons, 1.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
17,836 lbs / 8,090 Kg = 173.2 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): 77.0 %
- Above water (accommodation/working, high = better): 125.5 %
Waterplane Area: 27,128 Square feet or 2,520 Square metres
Displacement factor (Displacement / loading): 130 %
Structure weight / hull surface area: 109 lbs/sq ft or 533 Kg/sq metre
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


Refitted 1948 as follows:

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

Ancash - Refit begun 1 July 1948; completed 30 July 1948