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1

Tuesday, February 7th 2012, 6:07pm

Philippine Navy - Patrol Vessels

Repository for data pertaining to local patrol and fisheries protection vessels.

2

Tuesday, May 20th 2014, 11:15pm

Marawi class Patrol Combatant

Mawari - Rev B, Philippine Patrol Combatant laid down 1945

Displacement: 440 t light; 453 t standard; 496 t normal; 530 t full load

Dimensions: Length overall / water x beam x draught

217.48 ft / 209.97 ft x 22.47 ft x 8.20 ft (normal load) [66.29 m / 64.00 m x 6.85 m x 2.50 m]

Armament:

1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1945 Model Anti-aircraft gun in deck mount on centreline forward
2 - 1.38" / 35.0 mm guns (1x2 guns), 1.31lbs / 0.59kg shells, 1945 Model Anti-aircraft guns in deck mount on centreline aft
4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1945 Model Machine guns in deck mounts on side, evenly spread
Weight of broadside 16 lbs / 7 kg
Shells per gun, main battery: 300

Armour:

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

Conning tower: 0.98" / 25 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 7,548 shp / 5,631 Kw = 25.00 kts
Range 2,100nm at 15.00 kts
Bunker at max displacement = 77 tons

Complement: 52 - 68

Cost: £0.302 million / $1.209 million

Distribution of weights at normal displacement:

Armament: 2 tons, 0.4 %
Armour: 3 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 191 tons, 38.4 %
Hull, fittings & equipment: 205 tons, 41.3 %
Fuel, ammunition & stores: 56 tons, 11.3 %
Miscellaneous weights: 40 tons, 8.1 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 344 lbs / 156 Kg = 26.7 x 3.0 " / 75 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.6 ft / 0.2 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.93

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.449
Length to Beam Ratio: 9.34: 1
Natural speed' for length: 14.49 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 37
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: 18.04 ft / 5.50 m
- Forecastle (20 %): 15.58 ft / 4.75 m
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (15 %): 13.12 ft / 4.00 m
- Stern: 13.12 ft / 4.00 m
- Average freeboard: 14.18 ft / 4.32 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 136.7 %
- Above water (accommodation/working, high = better): 150.8 %
Waterplane Area: 3,006 Square feet or 279 Square metres
Displacement factor (Displacement / loading): 113 %
Structure weight / hull surface area: 24 lbs/sq ft or 116 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.55
- Longitudinal: 9.78
- Overall: 0.73
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
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weight:

Reserved for light search radar - 20 tons
Reserved for future growth - 20 tons



Marawi – Laid down 1 January 1945; launched 22 February 1945; Completed 10 May 1945
Meycauayan – Laid down 1 January 1945; launched 22 February 1945; Completed 10 May 1945
Pasay – Laid down 2 March 1945; Launched 23 April 1945; Completed 9 July 1945
Pateros – Laid down 2 March 1945; Launched 23 April 1945; Completed 9 July 1945
Carmona - Laid down 1 May 1945; Launched 22 June 1945; Completed 7 October 1945
Calaca - Laid down 1 May 1945; Launched 22 June 1945; Completed 7 October 1945
Navotas - Laid down 1 July 1945; Launched 22 August 1945; Completed 7 November 1945
Nasugbu - Laid down 1 July 1945; Launched 22 August 1945; Completed 7 November 1945
Danglas - Laid down 1 January 1946; Launched 22 February 1946; Completed 10 May 1946
Daragan - Laid down 1 January 1946; Launched 22 February 1946; Completed 10 May 1946
San Isidro - Laid down 1 April 1946; Launched 23 May 1946; Completed 8 August 1946
San Luis - Laid down 1 April 1946; Launched 23 May 1946; Completed 8 August 1946
Hermosa - Laid down 1 July 1946; Launched 22 August 1946; Completed 7 November 1946
Hagonoy - Laid down 1 July 1946; Launched 22 August 1946; Completed 7 November 1946
Alfonso - Laid down 1 October 1946; Launched 22 November 1946; Completed 7 February 1946
Amadeo - Laid down 1 October 1946; Launched 22 November 1946; Completed 7 February 1946

3

Tuesday, March 14th 2017, 2:40pm

Alcotan class Coastal Escort

Alcotan, Philippine Coastal Escort laid down 1948

Displacement: 590 t light; 622 t standard; 750 t normal; 853 t full load

Dimensions: Length overall / water x beam x draught

258.49 ft / 249.34 ft x 24.93 ft x 7.55 ft (normal load) [78.79 m / 76.00 m x 7.60 m x 2.30 m]

Armament:

4 - 2.95" / 75.0 mm guns (2x2 guns), 12.87lbs / 5.84kg shells, 1948 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, 1 raised mount
8 - 0.98" / 25.0 mm guns (4x2 guns), 0.48lbs / 0.22kg shells, 1948 Model Anti-aircraft guns in deck mounts on side, all amidships
Weight of broadside 55 lbs / 25 kg
Shells per gun, main battery: 500

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm - -

Conning tower: 0.98" / 25 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 8,056 shp / 6,010 Kw = 25.00 kts
Range 4,800nm at 16.00 kts
Bunker at max displacement = 231 tons

Complement: 71 - 93

Cost: £0.403 million / $1.611 million

Distribution of weights at normal displacement:

Armament: 7 tons, 0.9 %
Armour: 6 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: 197 tons, 26.2 %
Hull, fittings & equipment: 291 tons, 38.7 %
Fuel, ammunition & stores: 160 tons, 21.3 %
Miscellaneous weights: 90 tons, 12.0 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 949 lbs / 431 Kg = 73.8 x 3.0 " / 75 mm shells or 0.5 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 %): 63 %
- Recoil effect (Restricted arc if above 1.00): 0.19
Seaboat quality (Average = 1.00): 1.66

Hull form characteristics:

Hull has rise forward of midbreak and transom stern
Block coefficient: 0.560
Length to Beam Ratio: 10.00: 1
'Natural speed' for length: 17.91 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 38
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: 18.04 ft / 5.50 m
- Forecastle (20 %): 18.04 ft / 5.50 m
- Mid (50 %): 18.04 ft / 5.50 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (25 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 13.94 ft / 4.25 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 107.3 %
- Above water (accommodation/working, high = better): 175.1 %
Waterplane Area: 4,559 Square feet or 424 Square metres
Displacement factor (Displacement / loading): 138 %
Structure weight / hull surface area: 28 lbs/sq ft or 139 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.63
- Longitudinal: 5.05
- Overall: 0.78
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weight

Radar an electronics suite - 10 tons
Sonar and A/S sensor suite - 15 tons
Ahead-thrown ASW weapon installation - 15 tons
Depth charge racks and mortars - 40 tons (comprises four K-guns @2.5 tons per and two depth charge racks at 15 tons per inclusive of reloads
Tropicalization - 10 tons


Alcotan – Laid down 1 January 1948; Launched 28 April 1948
Halcon – Laid down 1 January 1948; Launched 28 April 1948

4

Tuesday, March 14th 2017, 2:44pm

Descubierta class Antisubmarine Gunboat

Descubierta, Philippine Antisubmarine Gunboat laid down 1948

Displacement: 498 t light; 534 t standard; 605 t normal; 662 t full load

Dimensions: Length overall / water x beam x draught

236.90 ft / 229.66 ft x 24.93 ft x 7.38 ft (normal load) [72.21 m / 70.00 m x 7.60 m x 2.25 m]

Armament:

4 - 2.24" / 57.0 mm guns (2x2 guns), 5.65lbs / 2.56kg shells, 1948 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, 1 raised mount
8 - 0.59" / 15.0 mm guns (4x2 guns), 0.10lbs / 0.05kg shells, 1948 Model Anti-aircraft guns in deck mounts on side, all amidships
Weight of broadside 23 lbs / 11 kg
Shells per gun, main battery: 1,800

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, 3 shafts, 8,340 shp / 6,222 Kw = 26.00 kts
Range 4,200nm at 14.00 kts
Bunker at max displacement = 127 tons

Complement: 60 - 79

Cost: £0.361 million / $1.443 million

Distribution of weights at normal displacement:

Armament: 3 tons, 0.5 %
Armour: 6 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 4 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.3 %
Machinery: 204 tons, 33.7 %
Hull, fittings & equipment: 215 tons, 35.6 %
Fuel, ammunition & stores: 108 tons, 17.8 %
Miscellaneous weights: 70 tons, 11.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 457 lbs / 207 Kg = 80.8 x 2.2 " / 57 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 0.8 ft / 0.2 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 64 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.33

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.501
Length to Beam Ratio: 9.21: 1
'Natural speed' for length: 17.40 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 48
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: 17.22 ft / 5.25 m
- Forecastle (25 %): 17.22 ft / 5.25 m
- Mid (50 %): 10.66 ft / 3.25 m
- Quarterdeck (25 %): 10.66 ft / 3.25 m
- Stern: 10.66 ft / 3.25 m
- Average freeboard: 13.12 ft / 4.00 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 129.6 %
- Above water (accommodation/working, high = better): 155.1 %
Waterplane Area: 3,971 Square feet or 369 Square metres
Displacement factor (Displacement / loading): 119 %
Structure weight / hull surface area: 25 lbs/sq ft or 122 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.58
- Longitudinal: 4.51
- Overall: 0.72
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weight

Radar and electronics suite - 10 tons
Sonar and A/S sensor suite - 10 tons
Ahead-thrown ASW weapon installation - 10 tons
Depth charge racks and mortars - 30 tons (comprises four K-guns @2.5 tons per and two depth charge racks at 10 tons per inclusive of reloads)
Tropicalization - 10 tons


Descubierta – Laid down 1 January 1948; Launched 3 March 1948; Completed 15 May 1948
Atrevida – Laid down 1 January 1948; Launched 3 March 1948; Completed 15 May 1948
Vencedora - Laid down 1 April 1948; Launched 2 June 1948
Cazadora - Laid down 1 April 1948; Launched 2 June 1948