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1

Sunday, June 23rd 2013, 6:49pm

Philippine Navy - Sloops and Ocean Escorts

Repository for data pertaining to the subject

2

Sunday, June 23rd 2013, 6:50pm

Marakina class Escort Sloop

Marakina, Philippine Escort Sloop laid down 1944

Displacement: 635 t light; 680 t standard; 834 t normal; 957 t full load

Dimensions: Length overall / water x beam x draught

234.32 ft / 229.66 ft x 27.89 ft x 10.17 ft (normal load) [71.42 m / 70.00 m x 8.50 m x 3.10 m]

Armament:

2 - 4.53" / 115 mm guns in single mounts, 46.40lbs / 21.05kg shells, 1944 Model Dual purpose guns in deck mounts on centreline ends, evenly spread
4 - 1.38" / 35.0 mm guns (2x2 guns), 1.31lbs / 0.59kg shells, 1944 Model Anti-aircraft guns in deck mounts on side, all amidships
Weight of broadside 98 lbs / 44 kg
Shells per gun, main battery: 500

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, 5,946 shp / 4,436 Kw = 22.00 kts
Range 5,700nm at 15.00 kts
Bunker at max displacement = 277 tons

Complement: 76 - 100

Cost: £0.362 million / $1.447 million

Distribution of weights at normal displacement:

Armament: 12 tons, 1.5 %
Armour: 7 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 152 tons, 18.2 %
Hull, fittings & equipment: 324 tons, 38.8 %
Fuel, ammunition & stores: 199 tons, 23.9 %
Miscellaneous weights: 140 tons, 16.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,281 lbs / 581 Kg = 27.6 x 4.5 " / 115 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 59 %
- Recoil effect (Restricted arc if above 1.00): 0.16
Seaboat quality (Average = 1.00): 1.57

Hull form characteristics:

Hull has rise forward of midbreak
Block coefficient: 0.448
Length to Beam Ratio: 8.24: 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 38
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 17.39 ft / 5.30 m
- Forecastle (20 %): 16.08 ft / 4.90 m
- Mid (50 %): 14.76 ft / 4.50 m (8.53 ft / 2.60 m aft of break)
- Quarterdeck (15 %): 8.53 ft / 2.60 m
- Stern: 8.53 ft / 2.60 m
- Average freeboard: 12.21 ft / 3.72 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 91.7 %
- Above water (accommodation/working, high = better): 119.7 %
Waterplane Area: 4,079 Square feet or 379 Square metres
Displacement factor (Displacement / loading): 152 %
Structure weight / hull surface area: 40 lbs/sq ft or 193 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.85
- Longitudinal: 4.30
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of miscellaneous weight:

Reserved for dradis - 20 tons
Reserved for sonar - 30 tons
Reserved for A/S outfit - four A/S mortars, two D/C racks and 40 depth charges - 50 tons
Reserved for tropicalization - 20 tons
Reserved for future growth 20 tons


Marakina - Laid down 1 January 1944; Launched 26 April 1944; Completed 15 October 1944
Banica - Laid down 1 January 1944; Launched 26 April 1944; Completed 15 October 1944
Sagawa - Laid down 1 July 1944; Launched 25 October 1944; Completed 15 April 1945
Agusan - Laid down 1 July 1944; Launched 25 October 1944; Completed 15 April 1945
Abulog - Laid down 1 January 1946; Launched 27 April 1946; Completed 16 October 1946
Paranaque - Laid down 1 January 1946; Launched 27 April 1946; Completed 16 October 1946
Manupali - Laid down 1 July 1946; Launched 25 October 1946; Completed 15 April 1947
Tagoloan - Laid down 1 July 1946; Launched 25 October 1946; Completed 15 April 1947

This post has been edited 2 times, last edit by "BruceDuncan" (Nov 1st 2013, 8:11pm)


3

Tuesday, October 21st 2014, 1:46pm

Jolo class Patrol Frigate

Jolo, Philippine Patrol Frigate laid down 1945

Displacement: 1,405 t light; 1,467 t standard; 1,725 t normal; 1,931 t full load

Dimensions: Length overall / water x beam x draught

355.29 ft / 344.49 ft x 39.37 ft x 10.50 ft (normal load) [108.29 m / 105.00 m x 12.00 m x 3.20 m]

Armament:

2 - 4.53" / 115 mm guns (1x2 guns), 46.40lbs / 21.05kg shells, 1945 Model Dual purpose guns in a deck mount with hoist 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 forward, all raised guns
4 - 0.59" / 15.0 mm guns (2x2 guns), 0.10lbs / 0.05kg shells, 1945 Model Machine guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 96 lbs / 43 kg
Shells per gun, main battery: 500

Armour:

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

Conning tower: 0.98" / 25 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 4,807 shp / 3,586 Kw = 20.00 kts
Range 6,100nm at 16.00 kts
Bunker at max displacement = 464 tons

Complement: 133 - 173

Cost: £0.527 million / $2.107 million

Distribution of weights at normal displacement:

Armament: 12 tons, 0.7 %
Armour: 7 tons, 0.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 4 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.2 %
Machinery: 121 tons, 7.0 %
Hull, fittings & equipment: 815 tons, 47.2 %
Fuel, ammunition & stores: 320 tons, 18.5 %
Miscellaneous weights: 450 tons, 26.1 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 5,159 lbs / 2,340 Kg = 111.2 x 4.5 " / 115 mm shells or 1.6 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.5 ft / 0.5 m
Roll period: 13.6 seconds
Steadiness - As gun platform (Average = 50 %): 68 %
- Recoil effect (Restricted arc if above 1.00): 0.13
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.424
Length to Beam Ratio: 8.75 : 1
'Natural speed' for length: 21.64 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 34
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.67 ft / 6.30 m
- Forecastle (20 %): 19.36 ft / 5.90 m
- Mid (50 %): 18.04 ft / 5.50 m
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 15.94 ft / 4.86 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 58.8 %
- Above water (accommodation/working, high = better): 203.5 %
Waterplane Area: 8,804 Square feet or 818 Square metres
Displacement factor (Displacement / loading): 217 %
Structure weight / hull surface area: 54 lbs/sq ft or 262 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 2.99
- Overall: 1.00
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

Provision for radar - 40 tons - Surface search, air search, navigational
Provision for sonar - 20 tons
Provision for A/S outfit - 10 tons (DC racks and 36 depth charges)
Provision for tropicalization - 20 tons
Provision for crane aft - 10 tons
Provision for up to four aircraft - 100 tons
Provision for Additional Accommodation of Embarked Marines - 250 tons


Jolo - Laid down 1 July 1945; Launched 3 November 1945; Completed 9 May 1946
Sulu - Laid down 1 July 1945; Launched 3 November 1945; Completed 9 May 1946
Laparan - Laid down 1 January 1946; Launched 6 May 1946; Completed 9 November 1946
Dinagat - Laid down 1 January 1946; Launched 6 May 1946; Completed 9 November 1946