WesWorld

Repository for information pertaining to the subject

(Historical data)

L-1, Peruvian Landing Craft, laid down 1941

Displacement: 277 t light; 284 t standard; 325 t normal; 358 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)

160.37 ft / 157.48 ft) x 22.97 ft x (5.25 / 5.68 ft [48.88 m / 48.00 m) x 7.00 m x (1.60 / 1.73 m]

Armament:

3 - 0.79" / 20.0 mm 45.0 cal guns - 0.25lbs / 0.11kg shells, 2,000 per gun Anti-air guns in deck mounts, 1941 Model
2 x Single mounts on sides, forward deck centre
1 x Single mount on centreline, aft deck centre
Weight of broadside 1 lbs / 0 kg

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm - -

Conning towers: Forward 0.59" / 15 mm, Aft 0.00" / 0 mm

Machinery:

Diesel Internal combustion motors, Direct drive, 2 shafts, 700 shp / 522 Kw = 13.99 kts
Range 4,000nm at 12.00 kts
Bunker at max displacement = 74 tons

Complement: 37 - 49

Cost: £0.077 million / $0.306 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.1 %
Guns: 0 tons, 0.1 %
Armour: 3 tons, 0.9 %
Armament: 2 tons, 0.7 %
Conning Tower: 1 tons, 0.2 %
Machinery: 18 tons, 5.7 %
Hull, fittings & equipment: 159 tons, 48.7 %
Fuel, ammunition & stores: 48 tons, 14.9 %
Miscellaneous weights: 97 tons, 29.8 %
- Hull above water: 90 tons
- On freeboard deck: 7 tons

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,408 lbs / 639 Kg = 5,769.1 x 0.8 " / 20 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 0.7 ft / 0.2 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck, a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.600 / 0.610
Length to Beam Ratio: 6.86 : 1
'Natural speed' for length: 12.55 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 16.40 ft / 5.00 m, 13.12 ft / 4.00 m
- Forward deck: 30.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
- Aft deck: 35.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
- Quarter deck: 15.00 %, 13.12 ft / 4.00 m, 13.12 ft / 4.00 m
- Average freeboard: 13.39 ft / 4.08 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 50.2 %
- Above water (accommodation/working, high = better): 178.7 %
Waterplane Area: 2,645 Square feet or 246 Square metres
Displacement factor (Displacement / loading): 236 %
Structure weight / hull surface area: 26 lbs/sq ft or 128 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.74
- Longitudinal: 13.68
- Overall: 1.00
Excellent machinery, storage, compartmentation space
Excellent accommodation and workspace room
Excellent seaboat, comfortable, can fire her guns in the heaviest weather


L-1, laid down 1941
L-2, laid down 1941
L-3, laid down 1942
L-4, laid down 1942
L-5, laid down 1942
L-6, laid down 1943
L-7, laid down 1943
L-8, laid down 1944

Santillana, Peruvian Coastal Transport laid down 1945

Displacement: 1,189 t light; 1,220 t standard; 1,563 t normal; 1,837 t full load

Dimensions: Length overall / water x beam x draught

215.04 ft / 209.97 ft x 36.09 ft x 13.12 ft (normal load) [65.54 m / 64.00 m x 11.00 m x 4.00 m]

Armament:

4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1945 Model Anti-aircraft guns in deck mounts on side, all aft
Weight of broadside 1 lbs / 0 kg
Shells per gun, main battery: 1,000

Armour:

Conning tower: 0.98" / 25 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 1,858 shp / 1,386 Kw = 14.50 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 616 tons

Complement: 123 - 161

Cost: £0.334 million / $1.334 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Armour: 3 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.2 %
Machinery: 47 tons, 3.0 %
Hull, fittings & equipment: 839 tons, 53.7 %
Fuel, ammunition & stores: 374 tons, 23.9 %
Miscellaneous weights: 300 tons, 19.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 5,511 lbs / 2,500 Kg = 22,576.7 x 0.8 " / 20 mm shells or 2.8 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.3 ft / 0.4 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has rise forward of midbreak, raised quarterdeck
Block coefficient: 0.550
Length to Beam Ratio: 5.82: 1
'Natural speed' for length: 14.49 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15.58 ft / 4.75 m
- Forecastle (15 %): 13.94 ft / 4.25 m
- Mid (50 %): 13.94 ft / 4.25 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (20 %): 13.94 ft / 4.25 m (9.84 ft / 3.00 m before break)
- Stern: 13.94 ft / 4.25 m
- Average freeboard: 12.81 ft / 3.91 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 32.2 %
- Above water (accommodation/working, high = better): 98.7 %
Waterplane Area: 5,288 Square feet or 491 Square metres
Displacement factor (Displacement / loading): 393 %
Structure weight / hull surface area: 95 lbs/sq ft or 462 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.86
- Longitudinal: 7.41
- Overall: 2.13
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Low-stowed cargo simmed as additional bunkers - true radius 2,500 nm on bunkers of 64 tons (BAM 114)

Breakdown of miscellaneous weight:

Provision for cargo handling gear (two derricks): 30 tons
Provision of quarters for 50 troops over short distances: 100 tons
Provision for deck cargo: 170 tons

Low stowed cargo - 450 tons including deep tanks for 2 x 50 tons liquid cargo


Vessel -:- Laid Down -:- Launched -:- Completed

Santillana -:- 1-Jan-45 -:- 30-Jun-45 -:- 3-Nov-45
Herrera -:- 1-Jan-45 -:- 30-Jun-45 -:- 3-Nov-45
Parocha -:- 1-Jan-46 -:- 30-Jun-46 -:- 3-Nov-46

Biru, Peruvian Coastal Freighter laid down 1943

Displacement: 2,400 t light; 2,496 t standard; 4,530 t normal; 6,157 t full load

Dimensions: Length overall / water x beam x draught

282.25 ft / 269.03 ft x 45.93 ft x 23.62 ft (normal load) [86.03 m / 82.00 m x 14.00 m x 7.20 m]

Armament:

1 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1943 Model Dual purpose gun in deck mount on centreline forward, 1 raised gun
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1943 Model Anti-aircraft guns in deck mounts on side, all aft, all raised mounts - superfiring
Weight of broadside 36 lbs / 16 kg
Shells per gun, main battery: 250

Machinery:

Diesel Internal combustion motors, Geared drive, 1 shaft, 1,644 shp / 1,226 Kw = 12.00 kts
Range 76,750nm at 10.00 kts
Bunker at max displacement = 3,662 tons

Complement: 275 - 358

Cost: £0.614 million / $2.455 million

Distribution of weights at normal displacement:

Armament: 5 tons, 0.1 %
Machinery: 42 tons, 0.9 %
Hull, fittings & equipment: 1,353 tons, 29.9 %
Fuel, ammunition & stores: 2,130 tons, 47.0 %
Miscellaneous weights: 1,000 tons, 22.1 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 15,254 lbs / 6,919 Kg = 431.9 x 4.1 " / 105 mm shells or 4.4 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.9 ft / 0.6 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 62 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has raised forecastle
Block coefficient: 0.543
Length to Beam Ratio: 5.86 : 1
'Natural speed' for length: 16.40 kts
Power going to wave formation at top speed: 34 %
Trim (Max stability = 0, Max steadiness = 100): 31
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.33 ft / 6.50 m
- Forecastle (10 %): 21.33 ft / 6.50 m (14.76 ft / 4.50 m aft of break)
- Mid (30 %): 14.76 ft / 4.50 m
- Quarterdeck (30 %): 21.33 ft / 6.50 m
- Stern: 21.33 ft / 6.50 m
- Average freeboard: 18.70 ft / 5.70 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 29.4 %
- Above water (accommodation/working, high = better): 97.5 %
Waterplane Area: 8,300 Square feet or 771 Square metres
Displacement factor (Displacement / loading): 404 %
Structure weight / hull surface area: 80 lbs/sq ft or 388 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.10
- Longitudinal: 7.57
- Overall: 1.33
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Low-stowed cargo simmed as additional bunkers. Normal radius 7,500 nm at 10 knots, bunkers of 219 tons. Remaining bunkers - ~1,800 tons - cargo

Breakdown of Miscellaneous weight:

Cargo handling gear - 150 tons
Anticipated deck cargo - 850 tons


Biru - acquired and converted 1943
Urubamba (ex Presidente Ramon Castilla) - acquired and converted 1943

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


LDI Nr. 101 - 103: Constructed in 1st Quarter 1948
LDI Nr. 105 - 107: Constructed in 2nd Quarter 1948
LDI Nr. 109 - 111: Constructed in 3rd Quarter 1948
LDI Nr. 113 - 115: Constructed in 4th Quarter 1948

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


LDA Nr.104: Constructed in the 1st Quarter 1948
LDA Nr.108: Constructed in the 2nd Quarter 1948
LDA Nr.112: Constructed in the 3rd Quarter 1948
LDA Nr.116: Constructed in the 4th Quarter 1948

Chachapoyas, Peruvian River Monitor laid down 1949

Displacement: 179 t light; 192 t standard; 200 t normal; 207 t full load

Dimensions: Length overall / water x beam x draught

157.14 ft / 155.84 ft x 21.33 ft x 4.92 ft (normal load) [47.90 m / 47.50 m x 6.50 m x 1.50 m]

Armament:

1 - 4.72" / 120 mm guns in single mounts, 52.72lbs / 23.91kg shells, 1949 Model Quick firing gun in deck mount on centerline forward
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1949 Model Anti-aircraft guns in deck mount on centerline amidships
4 - 0.79" / 20.0 mm guns (1x4 guns), 0.24lbs / 0.11kg shells, 1949 Model Anti-aircraft guns in deck mount on centerline aft
Weight of broadside 57 lbs / 26 kg
Shells per gun, main battery: 250

Armor:

Belts: Width (max) Length (avg) Height (avg)
Main: 0.79" / 20 mm 82.02 ft / 25.00 m 3.28 ft / 1.00 m
Ends: Unarmored
Main Belt covers 81 % of normal length

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -
2nd: 0.59" / 15 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 534 shp / 399 Kw = 15.00 kts
Range 2,000nm at 10.00 kts
Bunker at max displacement = 15 tons

Complement: 26 - 34

Cost: £0.107 million / $0.429 million

Distribution of weights at normal displacement:

Armament: 7 tons, 3.5 %
Armor: 12 tons, 6.1 %
- Belts: 9 tons, 4.7 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 1.4 %
- Armor Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 13 tons, 6.5 %
Hull, fittings & equipment: 117 tons, 58.5 %
Fuel, ammunition & stores: 21 tons, 10.4 %
Miscellaneous weights: 30 tons, 15.0 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 563 lbs / 255 Kg = 10.7 x 4.7 " / 120 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 0.6 ft / 0.2 m
Roll period: 11.2 seconds
Steadiness - As gun platform (Average = 50 %): 65 %
- Recoil effect (Restricted arc if above 1.00): 0.25
Seaboat quality (Average = 1.00): 1.81

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.428
Length to Beam Ratio: 7.31: 1
'Natural speed' for length: 14.79 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 36
Bow angle (Positive = bow angles forward): 9.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 8.20 ft / 2.50 m
- Forecastle (20 %): 8.20 ft / 2.50 m
- Mid (50 %): 8.20 ft / 2.50 m
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 8.20 ft / 2.50 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 67.3 %
- Above water (accommodation/working, high = better): 130.0 %
Waterplane Area: 2,164 Square feet or 201 Square meters
Displacement factor (Displacement / loading): 160 %
Structure weight / hull surface area: 33 lbs/sq ft or 163 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 1.02
- Longitudinal: 4.24
- Overall: 1.18
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Constructed under the small craft rules. Intended for service on the upper Amazon.

Main armament is a 120mm howitzer.

Proposed names: Chachapoyas, Bagua Grande, Jumbilla, Maria de Nieva

Chachapoyas - Completed 1Q49
Bagua Grande - Completed 2Q49
Jumbilla - Completed 3Q49
Maria de Nieva - Completed 4Q49

Pucalipa, Peruvian Plataforma Itinerante de Acción Social laid down 1949

Displacement: 195 t light; 199 t standard; 205 t normal; 210 t full load

Dimensions: Length overall / water x beam x draught

45.66 ft / 144.36 ft x 22.97 ft x 3.94 ft (normal load) [44.40 m / 44.00 m x 7.00 m x 1.20 m]

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 266 shp / 199 Kw = 12.00 kts
Range 2,000nm at 8.00 kts
Bunker at max displacement = 10 tons

Complement: 26 - 35

Cost: £0.059 million / $0.236 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Machinery: 6 tons, 3.1 %
Hull, fittings & equipment: 89 tons, 43.2 %
Fuel, ammunition & stores: 10 tons, 4.8 %
Miscellaneous weights: 100 tons, 48.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 630 lbs / 286 Kg = 5.8 x 6 " / 152 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.7 ft / 0.2 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.90

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.550
Length to Beam Ratio: 6.29: 1
'Natural speed' for length: 14.18 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 38
Bow angle (Positive = bow angles forward): 9.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 8.20 ft / 2.50 m
- Forecastle (20 %): 8.20 ft / 2.50 m
- Mid (50 %): 8.20 ft / 2.50 m
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 8.20 ft / 2.50 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 64.0 %
- Above water (accommodation/working, high = better): 144.7 %
Waterplane Area: 2,408 Square feet or 224 Square meters
Displacement factor (Displacement / loading): 182 %
Structure weight / hull surface area: 26 lbs/sq ft or 125 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.86
- Overall: 1.02
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, rides out heavy weather easily

Constructed under the small craft rules. Intended for riverine service

Breakdown of miscellaneous weight:

20 tons for a small operating theatre
15 tons for a medical dispensary
40 tons for two small class/meeting rooms
15 tons for small workshops
10 tons for storerooms for supplies and consumables

Tentative names: Pucalipa, Iparia, Atelaya, and Kiriqueti

Pucalipa - Completed 1Q49
Iparia - Completed 2Q49
Atelaya - Completed 3Q49
Kiriqueti - Completed 4Q49