WesWorld

Repository for data pertaining to the subject. Encompasses those vessels whose primary purpose is the defense of coastal areas and support of military operations ashore.

Pimentel, Peruvian Gunboat-Transport laid down 1946

Displacement: 1,776 t light; 1,856 t standard; 2,098 t normal; 2,291 t full load

Dimensions: Length overall / water x beam x draught

334.37 ft / 328.08 ft x 43.31 ft x 12.30 ft (normal load) [101.92 m / 100.00 m x 13.20 m x 3.75 m]

Armament:

6 - 4.13" / 105 mm guns (3x2 guns), 35.32lbs / 16.02kg shells, 1946 Model Dual purpose guns in deck mounts on centerline ends, majority forward, 1 raised mount - superfiring
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1946 Model Anti-aircraft guns in deck mounts on side, all amidships, all raised mounts - superfiring
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1946 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 220 lbs / 100 kg
Shells per gun, main battery: 300

Armor:

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

Conning tower: 0.98" / 25 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 5,415 shp / 4,040 Kw = 20.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 436 tons

Complement: 154 - 201

Cost: £0.739 million / $2.955 million

Distribution of weights at normal displacement:

Armament: 28 tons, 1.3 %
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: 135 tons, 6.4 %
Hull, fittings & equipment: 949 tons, 45.2 %
Fuel, ammunition & stores: 322 tons, 15.3 %
Miscellaneous weights: 650 tons, 31.0 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 4,308 lbs / 1,954 Kg = 122.0 x 4.1 " / 105 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.7 ft / 0.5 m
Roll period: 13.9 seconds
Steadiness - As gun platform (Average = 50 %): 69 %
- Recoil effect (Restricted arc if above 1.00): 0.10
Seaboat quality (Average = 1.00): 1.86

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.420
Length to Beam Ratio: 7.58: 1
'Natural speed' for length: 21.41 kts
Power going to wave formation at top speed: 46 %
Trim (Max stability = 0, Max steadiness = 100): 37
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: 19.36 ft / 5.90 m
- Forecastle (35 %): 14.27 ft / 4.35 m
- Mid (50 %): 12.47 ft / 3.80 m
- Quarterdeck (25 %): 12.47 ft / 3.80 m
- Stern: 12.47 ft / 3.80 m
- Average freeboard: 13.95 ft / 4.25 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 66.5 %
- Above water (accommodation/working, high = better): 145.7 %
Waterplane Area: 9,196 Square feet or 854 Square meters
Displacement factor (Displacement / loading): 182 %
Structure weight / hull surface area: 68 lbs/sq ft or 333 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 1.14
- Longitudinal: 2.45
- Overall: 1.23
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

Breakdown of miscellaneous weight:

50 tons for radar and electronics
450 tons for quarters for a troop contingent of 225
100 tons for cargo space for equipment and supplies
50 tons for additional cranes and boats


Vessel -:- Laid Down -:- Launched -:- Completed
Gunboat Transport Pimentel -:- 1-Jan-46 -:- 31-May-46 -:- 21-Nov-46
Gunboat Transport Parinas -:- 1-Jul-46 -:- 28-Nov-46 -:- 21-May-47

Angamos, Peruvian Coast Defense Gunboat laid down 1946

Displacement: 974 t light; 1,029 t standard; 1,220 t normal; 1,372 t full load

Dimensions: Length overall / water x beam x draught

238.21 ft / 229.66 ft x 31.17 ft x 10.50 ft (normal load) [72.61 m / 70.00 m x 9.50 m x 3.20 m]

Armament:

4 - 4.72" / 120 mm guns (2x2 guns), 52.72lbs / 23.91kg shells, 1946 Model Dual purpose 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, 1946 Model Anti-aircraft guns in deck mounts on side, all amidships, all raised mounts - superfiring
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1946 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 219 lbs / 99 kg
Shells per gun, main battery: 250

Armor:

Belts: Width (max) Length (avg) Height (avg)
Main: 1.97" / 50 mm 98.43 ft / 30.00 m 13.12 ft / 4.00 m
Ends: Unarmored
Main Belt covers 66 % of normal length

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 1.57" / 40 mm 2.36" / 60 mm
2nd: 0.98" / 25 mm 0.59" / 15 mm -
3rd: 0.59" / 15 mm - -

Armor deck: 1.18" / 30 mm, Conning tower: 1.57" / 40 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 5,503 shp / 4,105 Kw = 20.00 kts
Range 5,400nm at 15.00 kts
Bunker at max displacement = 342 tons

Complement: 103 - 134

Cost: £0.541 million / $2.165 million

Distribution of weights at normal displacement:

Armament: 27 tons, 2.2 %
Armor: 261 tons, 21.4 %
- Belts: 120 tons, 9.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 26 tons, 2.1 %
- Armor Deck: 111 tons, 9.1 %
- Conning Tower: 4 tons, 0.3 %
Machinery: 137 tons, 11.3 %
Hull, fittings & equipment: 528 tons, 43.3 %
Fuel, ammunition & stores: 246 tons, 20.2 %
Miscellaneous weights: 20 tons, 1.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,988 lbs / 1,355 Kg = 56.7 x 4.7 " / 120 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.1 ft / 0.3 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 79 %
- Recoil effect (Restricted arc if above 1.00): 0.67
Seaboat quality (Average = 1.00): 1.76

Hull form characteristics:

Hull has raised forecastle
Block coefficient: 0.568
Length to Beam Ratio: 7.37: 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 45
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.69 ft / 6.00 m
- Forecastle (30 %): 17.39 ft / 5.30 m (16.73 ft / 5.10 m aft of break)
- Mid (40 %): 16.73 ft / 5.10 m
- Quarterdeck (30 %): 10.17 ft / 3.10 m
- Stern: 10.17 ft / 3.10 m
- Average freeboard: 14.25 ft / 4.34 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 57.9 %
- Above water (accommodation/working, high = better): 134.1 %
Waterplane Area: 5,081 Square feet or 472 Square meters
Displacement factor (Displacement / loading): 157 %
Structure weight / hull surface area: 53 lbs/sq ft or 260 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 6.02
- Overall: 1.07
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, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weight

Navigation and surface search radar - 8 tons
Air search radar - 2 tons
Surface and air fire control radar - 8 tons
Dedicated diesel engine generator - 2 tons

Vessel -:- Laid Down -:- Launched -:- Completed
Coast Defense Gunboat Angamos -:- 1-Jan-46 -:- 31-May-46 -:- 22-Oct-46
Coast Defense Gunboat Casma -:- 1-Jan-46 -:- 31-May-46 -:- 22-Oct-46
Coast Defense Gunboat Pisagua -:- 1-Jul-46 -:- 28-Nov-46 -:- 21-Apr-47
Coast Defense Gunboat Chipana -:- 1-Jul-46 -:- 28-Nov-46 -:- 21-Apr-47