WesWorld

Repository for data pertaining to fleet support and service vessels.

(Historical data)

Philippine & Pacific Steam Ship Co. Gordita-class Fast Freighter laid down 1926
Two ships converted to Chorlito-class destroyer tender 1930

Displacement: 8,054 t light; 8,307 t standard; 9,878 t normal; 11,135 t full load

Dimensions: Length overall / water x beam x draught

489.28 ft / 482.28 ft x 60.70 ft x 19.69 ft (normal load) [149.13 m / 147.00 m x 18.50 m x 6.00 m]

Armament:

4 - 5.12" / 130 mm guns (2x2 guns), 70.00lbs / 31.75kg shells, 1925 Model Breech loading guns in deck mounts with hoists on centreline ends, evenly spread
8 - 2.95" / 75.0 mm guns (4x2 guns), 13.23lbs / 6.00kg shells, 1926 Model Dual purpose guns in deck mounts with hoists on side ends, evenly spread
8 - 2.24" / 57.0 mm guns (4x2 guns), 6.00lbs / 2.72kg shells, 1923 Model Dual purpose guns in deck mounts with hoists on side, all amidships
4 - 1.38" / 35.0 mm guns (2x2 guns), 1.31lbs / 0.60kg shells, 1930 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, all raised mounts
8 - 0.54" / 13.7 mm guns (4x2 guns), 0.11lbs / 0.05kg shells, 1925 Model Machine guns in deck mounts on side ends, evenly spread, all raised mounts - superfiring
Weight of broadside 440 lbs / 200 kg
Shells per gun, main battery: 200

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.98" / 25 mm 0.98" / 25 mm
2nd: 1.18" / 30 mm 0.59" / 15 mm 0.98" / 25 mm
3rd: 0.98" / 25 mm - -
4th: 0.59" / 15 mm - -

Conning tower: 1.97" / 50 mm

Machinery:

Diesel Internal combustion generators, Electric motors, 2 shafts, 6,805 shp / 5,077 Kw = 16.00 kts
Range 20,000nm at 12.00 kts (Bunkerage = 2,828 tons)

Complement: 495 - 644

Cost: £1.231 million / $4.926 million

Distribution of weights at normal displacement:

Armament: 52 tons, 0.5 %
Armour: 54 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 34 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 20 tons, 0.2 %
Machinery: 218 tons, 2.2 %
Hull, fittings & equipment: 3,230 tons, 32.7 %
Fuel, ammunition & stores: 1,824 tons, 18.5 %
Miscellaneous weights: 4,500 tons, 45.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 15,874 lbs / 7,200 Kg = 236.8 x 5.1 " / 130 mm shells or 2.6 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 2.6 ft / 0.8 m
Roll period: 15.8 seconds
Steadiness - As gun platform (Average = 50 %): 47 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.55

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 7.95 : 1
'Natural speed' for length: 21.96 kts
Power going to wave formation at top speed: 31 %
Trim (Max stability = 0, Max steadiness = 100): 29
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 7.00 ft / 2.13 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (20 %): 16.40 ft / 5.00 m
- Mid (50 %): 14.76 ft / 4.50 m
- Quarterdeck (15 %): 14.76 ft / 4.50 m
- Stern: 14.76 ft / 4.50 m
- Average freeboard: 15.99 ft / 4.88 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 61.8 %
- Above water (accommodation/working, high = better): 124.7 %
Waterplane Area: 21,409 Square feet or 1,989 Square metres
Displacement factor (Displacement / loading): 183 %
Structure weight / hull surface area: 103 lbs/sq ft or 501 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.25
- Longitudinal: 1.50
- Overall: 1.28
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


Chorlito, laid down 1926, converted 1930
Agachadiza, laid down 1926, converted 1930

(Historical data)

Filipino Capiz-class Harbour Tugboat, laid down 1927

Displacement: 157 t light; 162 t standard; 215 t normal; 258 t full load

Dimensions: Length overall / water x beam x draught

82.25 ft / 82.25 ft x 20.00 ft x 8.75 ft (normal load) [25.07 m / 25.07 m x 6.10 m x 2.67 m]

Armament:

3 - 0.98" / 25.0 mm guns (1x3 guns), 0.57lbs / 0.26kg shells, 1925 Model Anti-aircraft guns in a deck mount on centreline forward
2 - 0.54" / 13.7 mm guns in single mounts, 0.11lbs / 0.05kg shells, 1925 Model Machine guns in deck mounts on side, all aft, all raised mounts
Weight of broadside 2 lbs / 1 kg
Shells per gun, main battery: 300

Armour:

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

Machinery:

Diesel Internal combustion generators, Electric motors, 2 shafts, 396 shp / 296 Kw = 12.00 kts
Range 4,500nm at 12.00 kts (Bunkerage = 96 tons)

Complement: 27 - 36

Cost: £0.027 million / $0.108 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.1 %
Armour: 0 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 13 tons, 5.8 %
Hull, fittings & equipment: 134 tons, 62.4 %
Fuel, ammunition & stores: 58 tons, 26.9 %
Miscellaneous weights: 10 tons, 4.7 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):
960 lbs / 435 Kg = 2,013.3 x 1.0 " / 25 mm shells or 1.6 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 1.64

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.523
Length to Beam Ratio: 4.11 : 1
'Natural speed' for length: 9.07 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 43
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 12.00 ft / 3.66 m
- Forecastle (20 %): 10.00 ft / 3.05 m
- Mid (65 %): 8.00 ft / 2.44 m
- Quarterdeck (15 %): 8.00 ft / 2.44 m
- Stern: 8.00 ft / 2.44 m
- Average freeboard: 9.01 ft / 2.75 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 26.5 %
- Above water (accommodation/working, high = better): 68.6 %
Waterplane Area: 1,119 Square feet or 104 Square metres
Displacement factor (Displacement / loading): 584 %
Structure weight / hull surface area: 58 lbs/sq ft or 282 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.81
- Longitudinal: 34.34
- Overall: 2.43
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather


Capiz, laid down 1927
Antique, laid down 1927
Aklan, laid down 1927
Sorsogon, laid down 1927
Bukidnon, laid down 1927
Cotabato, laid down 1927
Lanao, laid down 1928
Agusan, laid down 1928

(Historical data)

Apayao, Filipino Water Tanker laid down 1927

Displacement: 205 t light; 211 t standard; 246 t normal; 274 t full load

Dimensions: Length overall / water x beam x draught

113.85 ft / 110.56 ft x 20.18 ft x 6.89 ft (normal load) [34.70 m / 33.70 m x 6.15 m x 2.10 m]

Armament:

2 - 1.57" / 40.0 mm guns in single mounts, 2.00lbs / 0.91kg shells, 1918 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
2 - 0.54" / 13.7 mm guns in single mounts, 0.11lbs / 0.05kg shells, 1925 Model Machine guns in deck mounts on side, all amidships
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 150

Armour:

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

Machinery:

Diesel Internal combustion generators, Electric motors, 2 shafts, 176 shp / 131 Kw = 10.00 kts
Range 5,500nm at 10.00 kts (Bunkerage = 63 tons)

Complement: 30 - 40

Cost: £0.031 million / $0.122 million

Distribution of weights at normal displacement:

Armament: 1 tons, 0.2 %
Armour: 0 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 6 tons, 2.3 %
Hull, fittings & equipment: 99 tons, 40.2 %
Fuel, ammunition & stores: 40 tons, 16.4 %
Miscellaneous weights: 100 tons, 40.7 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 545 lbs / 247 Kg = 278.8 x 1.6 " / 40 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.5 ft / 0.2 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 42 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 1.68

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.560
Length to Beam Ratio: 5.48 : 1
'Natural speed' for length: 10.51 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 21
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11.58 ft / 3.53 m
- Forecastle (20 %): 7.35 ft / 2.24 m
- Mid (50 %): 7.35 ft / 2.24 m
- Quarterdeck (15 %): 7.35 ft / 2.24 m
- Stern: 7.35 ft / 2.24 m
- Average freeboard: 7.69 ft / 2.34 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 54.2 %
- Above water (accommodation/working, high = better): 73.3 %
Waterplane Area: 1,572 Square feet or 146 Square metres
Displacement factor (Displacement / loading): 213 %
Structure weight / hull surface area: 37 lbs/sq ft or 179 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.27
- Longitudinal: 6.87
- Overall: 1.51
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Excellent seaboat, comfortable, can fire her guns in the heaviest weather


Apayao, laid down 1927

(Historical data)

PRS Santa Maria, Filipino Hospital ship laid down 1921 (converted 1929)

Displacement: 7,674 t light; 7,868 t standard; 9,742 t normal; 11,242 t full load

Dimensions: Length overall / water x beam x draught

467.00 ft / 460.00 ft x 61.00 ft x 19.60 ft (normal load) [142.34 m / 140.21 m x 18.59 m x 5.97 m]

Machinery:

Oil fired boilers, complex reciprocating steam engines, Direct drive, 2 shafts, 6,828 ihp / 5,094 Kw = 16.00 kts
Range 17,500nm at 12.00 kts (Bunkerage = 3,373 tons)

Complement: 489 - 637

Cost: £0.826 million / $3.304 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Machinery: 399 tons, 4.1 %
Hull, fittings & equipment: 2,774 tons, 28.5 %
Fuel, ammunition & stores: 2,069 tons, 21.2 %
Miscellaneous weights: 4,500 tons, 46.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 15,409 lbs / 6,990 Kg = 142.7 x 6 " / 152 mm shells or 2.5 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 2.8 ft / 0.8 m
Roll period: 15.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.75

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.620
Length to Beam Ratio: 7.54 : 1
'Natural speed' for length: 21.45 kts
Power going to wave formation at top speed: 33 %
Trim (Max stability = 0, Max steadiness = 100): 28
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 7.00 ft / 2.13 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.50 ft / 7.16 m
- Forecastle (20 %): 17.50 ft / 5.33 m
- Mid (50 %): 15.00 ft / 4.57 m
- Quarterdeck (15 %): 15.00 ft / 4.57 m
- Stern: 15.00 ft / 4.57 m
- Average freeboard: 16.36 ft / 4.99 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 64.3 %
- Above water (accommodation/working, high = better): 126.9 %
Waterplane Area: 20,909 Square feet or 1,942 Square metres
Displacement factor (Displacement / loading): 184 %
Structure weight / hull surface area: 90 lbs/sq ft or 442 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.16
- Longitudinal: 1.48
- Overall: 1.19
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, rides out heavy weather easily


Santa Maria, laid down 1921, converted 1929

(Historical data)

Maguindanao, Filipino Repair Ship converted 1930

Length, 142.7 m x Beam, 19.8 m x Depth, 5.5 m
9387 tonnes normal displacement (8225 tonnes standard)

Main battery: 3 x 10-cm
Secondary battery: 8 x 3.5-cm

Weight of broadside: 53 kg

Hull unarmored

Battery armor:
Main, 3.0 cm shields / secondary, 2.0 cm shields

Maximum speed for 3996 shaft kw = 15.00 knots
Approximate cruising radius, 15000 nm / 12 knots

Typical complement: 477-620

Miscellaneous Weight:
-1,400 t: Workshops and fabrication plants
-500 t: Cranes
-2,000 t: Parts and spares
-500 t: Accommodation for 250 "displaced" crew
-75 t: Command facilities for "displaced" command staff
-25 t: Medical facilities

Estimated cost, $4.609 million (£1.152 million)

Remarks:

Excellent seaboat; comfortable and able to fight her guns in the heaviest weather
Magazines and engineering spaces are roomy, with superior watertight subdivision
Ship is roomy, with superior accommodation and working space.

Distribution of weights:
Percent
normal
displacement:

Armament ......................... 15 tonnes = 0 pct
Armor, total ..................... 7 tonnes = 0 pct

Armament 7 tonnes = 0 pct

Machinery ........................ 169 tonnes = 2 pct
Hull and fittings; equipment ..... 3337 tonnes = 36 pct
Fuel, ammunition, stores ......... 1359 tonnes = 14 pct
Miscellaneous weights ............ 4500 tonnes = 48 pct
-----
9387 tonnes = 100 pct

Estimated metacentric height, 0.9 m

Displacement summary:

Light ship: 8028 tonnes
Standard displacement: 8225 tonnes
Normal service: 9387 tonnes
Full load: 10279 tonnes

Loading submergence 2025 tonnes/metre

Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.05
Shellfire needed to sink: 7338 kg = 457.0 x 10.5-cm shells (Approximates weight of penetrating shell hits needed to sink ship, not counting critical hits)
Torpedoes needed to sink: 2.8 (Approximates number of 'typical' torpedo hits needed to sink ship)
Relative steadiness as gun platform, 60 percent (50 percent is 'average')
Relative rocking effect from firing to beam, 0.01
Relative quality as a seaboat: 1.58

Hull form characteristics:

Block coefficient: 0.60
Sharpness coefficient: 0.40
Hull speed coefficient 'M' = 6.78
'Natural speed' for length = 21.6 knots
Power going to wave formation at top speed: 30 percent

Estimated hull characteristics and strength:

Relative underwater volume absorbed by magazines and engineering spaces: 60 percent
Relative accommodation and working space: 133 percent
Displacement factor: 189 percent (Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.38 (Structure weight per square metre of hull surface: 534 kg)
Relative longitudinal hull strength: 1.54 (for 4.70 m average freeboard;freeboard adjustment +0.14 m)
Relative composite hull strength: 1.39

[Machine-readable parameters: Spring Style v. 1.2.1]

468.00 x 65.00 x 18.00; 15.42 -- Dimensions
0.60 -- Block coefficient
1927 -- Year laid down
15.00 / 15000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
4500 tons -- Miscellaneous weights
++++++++++
3 x 4.13; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
8 x 1.38; 0 -- Secondary battery; turrets
Gun-shields
:
0 -- No tertiary (QF/AA) battery
0 -- No fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
1.18 / 0.79 / 0.00 / 0.00 -- Battery armor

(Note: For portability, values are stored in Anglo-American units)

Cabo Bojeador, Philippine Civil Support Ship laid down 1945

Displacement: 410 t light; 424 t standard; 686 t normal; 896 t full load

Dimensions: Length overall / water x beam x draught

150.22 ft / 144.36 ft x 24.61 ft x 9.02 ft (normal load) [45.79 m / 44.00 m x 7.50 m x 2.75 m]

Armament:

1 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1945 Model Anti-aircraft gun in deck mount on centreline forward
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1945 Model Machine guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 1 lbs / 0 kg
Shells per gun, main battery: 300

Armour:

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

Conning tower: 0.39" / 10 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 2,161 shp / 1,612 Kw = 16.00 kts
Range 10,000nm at 14.00 kts
Bunker at max displacement = 472 tons

Complement: 66 - 87

Cost: £0.152 million / $0.609 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Armour: 1 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.1 %
Machinery: 55 tons, 8.0 %
Hull, fittings & equipment: 234 tons, 34.2 %
Fuel, ammunition & stores: 276 tons, 40.2 %
Miscellaneous weights: 120 tons, 17.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,094 lbs / 950 Kg = 4,392.9 x 1.0 " / 25 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.1 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has raised quarterdeck
Block coefficient: 0.749
Length to Beam Ratio: 5.87 : 1
'Natural speed' for length: 12.01 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 36
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: 18.04 ft / 5.50 m
- Forecastle (20 %): 15.58 ft / 4.75 m
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (15 %): 15.58 ft / 4.75 m (13.12 ft / 4.00 m before break)
- Stern: 15.58 ft / 4.75 m
- Average freeboard: 14.55 ft / 4.44 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 46.2 %
- Above water (accommodation/working, high = better): 117.5 %
Waterplane Area: 2,973 Square feet or 276 Square metres
Displacement factor (Displacement / loading): 297 %
Structure weight / hull surface area: 34 lbs/sq ft or 168 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.84
- Longitudinal: 16.91
- Overall: 1.14
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

Cargo simmed as bunkers - Actual radius 2,200 nm at 14 knots with BAM 109 tons.
Cargo represents 80 tons POL storage for distribution, 80 tons dry stores for distribution, 40 tons medical supplies for use or distribution, 20 tons fresh water in tanks with pumps

Breakdown of miscellaneous weight:

Accommodation for disaster response team - 30 tons
Expanded dispensary and medical facilities - 60 tons
Evaporators, generators and necessary shore connections - 30 tons


Cabo Bojeador – Laid down 1 January 1945; Launched 20 February 1945; Completed 25 May 1945
Thich Anh Hung (Indochinese account) – Laid down 1 January 1945; Launched 20 February 1945; Completed 25 May 1945
Cabo Engaño - Laid down 1 July 1945; Launched 20 August 1945; Completed 1 November 1945
Cabo Bolinao - Laid down 1 July 1945; Launched 20 August 1945; Completed 1 November 1945
Cabo Santiago - Laid down 1 July 1945; Launched 20 August 1945; Completed 1 November 1945
Cabo Espiritu Santo - Laid down 15 February 1946; Launched 18 April 1946; Completed 18 June 1946
Cabo San Ildefonso - Laid down 15 February 1946; Launched 18 April 1946; Completed 18 June 1946
Cabo Calavite - Laid down 1 September 1946; Launched 2 November 1946; Completed 2 January 1947
Cabo Buliluyan - Laid down 1 September 1946; Launched 2 November 1946; Completed 2 January 1947

Pamalican, Philippine Fleet Support Ship laid down 1943

Displacement: 6,568 t light; 6,888 t standard; 15,801 t normal; 22,932 t full load

Dimensions: Length overall / water x beam x draught

457.17 ft / 440.03 ft x 59.81 ft x 30.02 ft (normal load) [139.35 m / 134.12 m x 18.23 m x 9.15 m]

Armament:

8 - 1.38" / 35.0 mm guns (4x2 guns), 1.31lbs / 0.59kg shells, 1947 Model Anti-aircraft guns in deck mounts on side, evenly spread, 2 raised mounts
Aft Main mounts separated by engine room
Weight of broadside 10 lbs / 5 kg
Shells per gun, main battery: 600

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.39" / 10 mm -

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 19,432 shp / 14,497 Kw = 19.50 kts
Range 51,000nm at 16.00 kts
Bunker at max displacement = 16,044 tons

Complement: 704 - 916

Cost: £1.972 million / $7.887 million

Distribution of weights at normal displacement:

Armament: 1 tons, 0.0 %
Armour: 3 tons, 0.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 502 tons, 3.2 %
Hull, fittings & equipment: 3,062 tons, 19.4 %
Fuel, ammunition & stores: 9,233 tons, 58.4 %
Miscellaneous weights: 3,000 tons, 19.0 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 43,909 lbs / 19,917 Kg = 33,564.4 x 1.4 " / 35 mm shells or 6.2 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 3.0 ft / 0.9 m
Roll period: 14.5 seconds
Steadiness - As gun platform (Average = 50 %): 94 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.87

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.700
Length to Beam Ratio: 7.36: 1
'Natural speed' for length: 20.98 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 22.00 degrees
Stern overhang: 5.02 ft / 1.53 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.02 ft / 9.15 m
- Forecastle (20 %): 18.50 ft / 5.64 m
- Mid (50 %): 17.55 ft / 5.35 m
- Quarterdeck (15 %): 18.50 ft / 5.64 m
- Stern: 19.03 ft / 5.80 m
- Average freeboard: 19.16 ft / 5.84 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 32.5 %
- Above water (accommodation/working, high = better): 102.9 %
Waterplane Area: 21,094 Square feet or 1,960 Square metres
Displacement factor (Displacement / loading): 393 %
Structure weight / hull surface area: 87 lbs/sq ft or 425 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 2.06
- Overall: 1.04
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

Notes:

True range 12,000 nm on bunkers of 3,884 tons. Additional bunkers used to sim low-stowed cargo of 5,000 tons

Fuel oil 1,500 tons; Diesel oil 1.500 tons; Fresh water 500 tons; Dry stores 1,500 tons; total 5,000 tons

Breakdown of miscellaneous weight:

Cranes and heavy handling equipment: 350 tons
Accommodation for service personnel: 800 tons
Electrical shop: 300 tons
Metalsmithing shop: 300 tons
Engine maintenance shop: 300 tons
Ordnance maintenance shop: 300 tons
Boat maintenance shop: 300 tons
Water distillation equipment: 150 tons
Enhanced medical facilities: 200 tons

Cost for conversion: 1,642 tons

Time for conversion: 117 days


Pamalican (Submarine Depot Ship Configuration) – Conversion commenced 1 July 1946; Conversion completed 26 October 1946
Maricaban (Submarine Depot Ship Configuration) - Conversion commenced 1 October 1946; Conversion completed 26 January 1947

Buenavista, Philippine Base Support Ship laid down 1944

Displacement: 2,139 t light; 2,259 t standard; 5,880 t normal; 8,776 t full load

Dimensions: Length overall / water x beam x draught

319.65 ft / 318.01 ft x 46.00 ft x 21.00 ft (normal load) [97.43 m / 96.93 m x 14.02 m x 6.40 m]

Armament:

4 - 1.38" / 35.0 mm guns in single mounts, 1.31lbs / 0.59kg shells, 1944 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, all raised mounts - superfiring
Weight of broadside 5 lbs / 2 kg
Shells per gun, main battery: 600

Machinery:

Oil fired boilers, complex reciprocating steam engines, Direct drive, 1 shaft, 2,526 ihp / 1,884 Kw = 13.00 kts
Range 73,700nm at 11.00 kts
Bunker at max displacement = 6,518 tons

Complement: 335 - 436

Cost: £0.637 million / $2.548 million

Distribution of weights at normal displacement:

Armament: 1 tons, 0.0 %
Machinery: 138 tons, 2.3 %
Hull, fittings & equipment: 1,251 tons, 21.3 %
Fuel, ammunition & stores: 3,740 tons, 63.6 %
Miscellaneous weights: 750 tons, 12.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 27,732 lbs / 12,579 Kg = 21,198.6 x 1.4 " / 35 mm shells or 6.7 torpedoes
Stability (Unstable if below 1.00): 1.30
Metacentric height 2.5 ft / 0.8 m
Roll period: 12.3 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- 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
Block coefficient: 0.670
Length to Beam Ratio: 6.91 : 1
'Natural speed' for length: 17.83 kts
Power going to wave formation at top speed: 35 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.33 ft / 6.50 m
- Forecastle (20 %): 19.69 ft / 6.00 m
- Mid (40 %): 16.40 ft / 5.00 m
- Quarterdeck (20 %): 16.40 ft / 5.00 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 17.68 ft / 5.39 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 23.3 %
- Above water (accommodation/working, high = better): 108.8 %
Waterplane Area: 11,286 Square feet or 1,049 Square metres
Displacement factor (Displacement / loading): 571 %
Structure weight / hull surface area: 62 lbs/sq ft or 301 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 3.06
- Overall: 1.00
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 bunkers.

True radius 6,000 nm on bunkers of 322 tons; remaining 3,290 tons represents cargo.

Breakdown of Miscellaneous weight:

Cargo Handling Gear - 100 tons
Workshops - 200 tons
Accommodation for Working Parties - 200 tons (100 personnel)
Provision for additional medical facilities - 50 tons
Provision for Deck Cargo - 150 tons
Provision for refrigeration plant - 25 tons
Tropicalization - 25 tons

Cost to Convert - 525 tons
Time to Convert - 84 days


Low stowed cargo includes provision for 1000 tons diesel fuel, 500 tons fresh water, 500 tons motor gasoline, 1,000 tons dry stores, 290 tons refrigerated cargo


Buenavista - Conversion commenced 1 October 1946, Conversion completed 25 December 1946
Mondragon - Conversion commenced 1 October 1946, Conversion completed 25 December 1946

Makati, Philippine MTB Depot Ship laid down 1947

Displacement: 750 t light; 770 t standard; 886 t normal; 978 t full load

Dimensions: Length overall / water x beam x draught

234.05 ft / 229.66 ft x 31.17 ft x 7.22 ft (normal load) [71.34 m / 70.00 m x 9.50 m x 2.20 m]

Armament:

4 - 1.38" / 35.0 mm guns (2x2 guns), 1.31lbs / 0.59kg shells, 1947 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
Weight of broadside 5 lbs / 2 kg
Shells per gun, main battery: 600

Armour:

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

Machinery:

Diesel Internal combustion motors, Geared drive, 1 shaft, 1,487 shp / 1,109 Kw = 15.00 kts
Range 11,000nm at 10.00 kts
Bunker at max displacement = 209 tons

Complement: 80 - 105

Cost: £0.232 million / $0.930 million

Distribution of weights at normal displacement:

Armament: 1 tons, 0.1 %
Armour: 1 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 37 tons, 4.1 %
Hull, fittings & equipment: 312 tons, 35.3 %
Fuel, ammunition & stores: 135 tons, 15.3 %
Miscellaneous weights: 400 tons, 45.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,076 lbs / 942 Kg = 1,587.3 x 1.4 " / 35 mm shells or 1.1 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 %): 64 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 7.37: 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 32
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: 16.40 ft / 5.00 m
- Forecastle (20 %): 13.29 ft / 4.05 m
- Mid (50 %): 10.66 ft / 3.25 m
- Quarterdeck (15 %): 10.66 ft / 3.25 m
- Stern: 10.66 ft / 3.25 m
- Average freeboard: 11.83 ft / 3.61 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 64.1 %
- Above water (accommodation/working, high = better): 137.4 %
Waterplane Area: 5,121 Square feet or 476 Square metres
Displacement factor (Displacement / loading): 185 %
Structure weight / hull surface area: 38 lbs/sq ft or 185 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 2.43
- Overall: 1.02
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

Actual radius 3,000 nm on bunkers of 35 tons; remaining 80 tons available to refuel supported craft.

Breakdown of miscellaneous weight

Deck gear (cranes, derricks, winches) - 25 tons
Accommodation space for work crews - 120 tons
Distilling plant - 15 tons
Workshop space - 120 tons
Tropicalization - 20 tons
Consumable stores - 100 tons


Makati – Laid down 1 January 1947; Launched 29 April 1947; Completed 21 October 1947
Malabon – Laid down 1 January 1947; Launched 29 April 1947; Completed 21 October 1947
Taguig – Laid down 1 January 1947; Launched 29 April 1947; Completed 21 October 1947
Tondo – Laid down 1 January 1947; Launched 29 April 1947; Completed 21 October 1947

Abra, Philippine Escort Tanker laid down 1947

Displacement: 1,975 t light; 2,111 t standard; 6,690 t normal; 10,353 t full load

Dimensions: Length overall / water x beam x draught

362.12 ft / 355.97 ft x 45.93 ft x 20.18 ft (normal load) [110.38 m / 108.50 m x 14.00 m x 6.15 m]

Armament:

2 - 1.38" / 35^0 mm guns #1x2 guns#, 1^31lbs / 0^59kg shells, 1947 Model Anti-aircraft guns in deck mount on centreline aft
4 - 0^59" / 15^0 mm guns in single mounts, 0^10lbs / 0^05kg shells, 1947 Model Anti-aircraft guns in deck mounts on side, all aft, all raised mounts - superfiring
Weight of broadside 3 lbs / 1 kg
Shells per gun, main battery: 1,200

Machinery:

Diesel Internal combustion motors, Geared drive, 1 shaft, 9,005 shp / 6,718 Kw = 18^00 kts
Range 51,900nm at 15^00 kts
Bunker at max displacement = 8,242 tons

Complement: 369 - 480

Cost: £0^732 million / $2^926 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0^0 %
Machinery: 222 tons, 3^3 %
Hull, fittings & equipment: 1,452 tons, 21^7 %
Fuel, ammunition & stores: 4,715 tons, 70^5 %
Miscellaneous weights: 300 tons, 4^5 %

Overall survivability and seakeeping ability:

Survivability #Non-critical penetrating hits needed to sink ship#: 45,685 lbs / 20,722 Kg = 34,922^2 x 1^4 " / 35 mm shells or 10^2 torpedoes
Stability #Unstable if below 1^00#: 1^67
Metacentric height 3^6 ft / 1^1 m
Roll period: 10^1 seconds
Steadiness - As gun platform #Average = 50 %#: 100 %
- Recoil effect #Restricted arc if above 1^00#: 0^00
Seaboat quality #Average = 1^00#: 2^00

Hull form characteristics:

Hull has raised quarterdeck
Block coefficient: 0^710
Length to Beam Ratio: 7^75: 1
'Natural speed' for length: 18^87 kts
Power going to wave formation at top speed: 49 %
Trim #Max stability = 0, Max steadiness = 100#: 50
Bow angle #Positive = bow angles forward#: 15^00 degrees
Stern overhang: 0^00 ft / 0^00 m
Freeboard #% = measuring lo#ation as a percentage of overall length#:
- Stem: 22^97 ft / 7^00 m
- Forecastle #20 %#: 17^22 ft / 5^25 m
- Mid #50 %#: 14^76 ft / 4^50 m
- Quarterdeck #15 %#: 21^33 ft / 6^50 m #14^76 ft / 4^50 m before break#
- Stern: 21^33 ft / 6^50 m
- Average freeboard: 17^07 ft / 5^20 m

Ship space, strength and comments:

Space - Hull below water #magazines/engines, low = better#: 17^6 %
- Above water #accommodation/working, high = better#: 104.1 %
Waterplane Area: 13,149 Square feet or 1,222 Square metres
Displacement factor #Displacement / loading#: 894 %
Structure weight / hull surface area: 64 lbs/sq ft or 314 Kg/sq metre
Hull strength #Relative#:
- Cross-sectional: 0.94
- Longitudinal: 2.24
- Overall: 1.03
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. Normal radius is 6,000 nm at 15 knots.

Breakdown of low stowed cargo: 2,000 tons diesel oil, 1,880 tons bunker fuel oil, 150 tons aviation spirit

Breakdown of miscellaneous weight:

120 tons reserved for deck gear and underway replenishment equipment
90 tons reserved for provisions and other stores
80 tons reserved for munitions
10 tons reserved for navigational radar


Abra – Laid down 1 January 1947; Launched 13 May 1947; Completed 27 November 1947
Apayao - Laid down 1 July 1947; Launched 10 November 1947; Completed 26 May 1948
Aurora - Laid down 1 January 1948; Launched 12 May 1948; Completed 26 November 1948
Albay - Laid down 1 July 1948; Launched 10 November 1948; Completed 27 May 1949

Sabatang, Philippine Minesweeper Support Ship laid down 1947

Displacement: 750 t light; 770 t standard; 886 t normal; 978 t full load

Dimensions: Length overall / water x beam x draught

234.05 ft / 229.66 ft x 31.17 ft x 7.22 ft (normal load) [71.34 m / 70.00 m x 9.50 m x 2.20 m]

Armament:

4 - 1.38" / 35.0 mm guns (2x2 guns), 1.31lbs / 0.59kg shells, 1947 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
Weight of broadside 5 lbs / 2 kg
Shells per gun, main battery: 600

Armour:

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

Machinery:

Diesel Internal combustion motors, Geared drive, 1 shaft, 1,487 shp / 1,109 Kw = 15.00 kts
Range 11,000nm at 10.00 kts
Bunker at max displacement = 209 tons

Complement: 80 - 105

Cost: £0.232 million / $0.930 million

Distribution of weights at normal displacement:

Armament: 1 tons, 0.1 %
Armour: 1 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 37 tons, 4.1 %
Hull, fittings & equipment: 312 tons, 35.3 %
Fuel, ammunition & stores: 135 tons, 15.3 %
Miscellaneous weights: 400 tons, 45.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,076 lbs / 942 Kg = 1,587.3 x 1.4 " / 35 mm shells or 1.1 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 %): 64 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 7.37: 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 32
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: 16.40 ft / 5.00 m
- Forecastle (20 %): 13.29 ft / 4.05 m
- Mid (50 %): 10.66 ft / 3.25 m
- Quarterdeck (15 %): 10.66 ft / 3.25 m
- Stern: 10.66 ft / 3.25 m
- Average freeboard: 11.83 ft / 3.61 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 64.1 %
- Above water (accommodation/working, high = better): 137.4 %
Waterplane Area: 5,121 Square feet or 476 Square metres
Displacement factor (Displacement / loading): 185 %
Structure weight / hull surface area: 38 lbs/sq ft or 185 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 2.43
- Overall: 1.02
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

Actual radius 3,000 nm on bunkers of 35 tons; remaining 80 tons available to refuel supported craft.

Breakdown of miscellaneous weight

Deck gear (cranes, derricks, winches) - 25 tons
Accommodation space for work crews - 120 tons
Distilling plant - 15 tons
Workshop space - 120 tons
Tropicalization - 20 tons
Consumable stores - 100 tons


Sabtang - Laid down 1 July 1947; Launched 27 October 1947; Completed 19 April 1948
Siayan - Laid down 1 July 1947; Launched 27 October 1947; Completed 19 April 1948

Toboso, Philippine Minelayer Support Ship laid down 1947

Displacement: 750 t light; 770 t standard; 886 t normal; 978 t full load

Dimensions: Length overall / water x beam x draught

234.05 ft / 229.66 ft x 31.17 ft x 7.22 ft (normal load) [71.34 m / 70.00 m x 9.50 m x 2.20 m]

Armament:

4 - 1.38" / 35.0 mm guns (2x2 guns), 1.31lbs / 0.59kg shells, 1947 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
Weight of broadside 5 lbs / 2 kg
Shells per gun, main battery: 600

Armour:

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

Machinery:

Diesel Internal combustion motors, Geared drive, 1 shaft, 1,487 shp / 1,109 Kw = 15.00 kts
Range 11,000nm at 10.00 kts
Bunker at max displacement = 209 tons

Complement: 80 - 105

Cost: £0.232 million / $0.930 million

Distribution of weights at normal displacement:

Armament: 1 tons, 0.1 %
Armour: 1 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 37 tons, 4.1 %
Hull, fittings & equipment: 312 tons, 35.3 %
Fuel, ammunition & stores: 135 tons, 15.3 %
Miscellaneous weights: 400 tons, 45.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,076 lbs / 942 Kg = 1,587.3 x 1.4 " / 35 mm shells or 1.1 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 %): 64 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 7.37: 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 32
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: 16.40 ft / 5.00 m
- Forecastle (20 %): 13.29 ft / 4.05 m
- Mid (50 %): 10.66 ft / 3.25 m
- Quarterdeck (15 %): 10.66 ft / 3.25 m
- Stern: 10.66 ft / 3.25 m
- Average freeboard: 11.83 ft / 3.61 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 64.1 %
- Above water (accommodation/working, high = better): 137.4 %
Waterplane Area: 5,121 Square feet or 476 Square metres
Displacement factor (Displacement / loading): 185 %
Structure weight / hull surface area: 38 lbs/sq ft or 185 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 2.43
- Overall: 1.02
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

Actual radius 3,000 nm on bunkers of 35 tons; remaining 80 tons available to refuel supported craft.

Breakdown of miscellaneous weight

Deck gear (cranes, derricks, winches) - 25 tons
Accommodation space for work crews - 120 tons
Distilling plant - 15 tons
Workshop space - 120 tons
Tropicalization - 20 tons
Consumable stores - 100 tons

Toboso - Laid down 1 July 1947; Launched 27 October 1947; Completed 19 April 1948
Talaingod - Laid down 1 July 1947; Launched 27 October 1947; Completed 19 April 1948

Lankiam, Philippine Seaplane Tender laid down 1950

Displacement: 1,095 t light; 1,148 t standard; 1,589 t normal; 1,942 t full load

Dimensions: Length overall / water x beam x draught

305.75 ft / 295.28 ft x 38.55 ft x 10.50 ft (normal load) [93.19 m / 90.00 m x 11.75 m x 3.20 m]

Armament:

2 - 4.53" / 115 mm guns in single mounts, 46.40lbs / 21.05kg shells, 1950 Model Dual purpose guns in deck mounts on centreline ends, evenly spread, 1 raised mount
2 - 2.24" / 57.0 mm guns (1x2 guns), 5.65lbs / 2.56kg shells, 1950 Model Anti-aircraft guns in deck mount on side amidships, all raised guns
Weight of broadside 104 lbs / 47 kg
Shells per gun, main battery: 350

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.39" / 10 mm -

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 3,697 shp / 2,758 Kw = 18.00 kts
Range 14,500nm at 14.00 kts
Bunker at max displacement = 794 tons

Complement: 125 - 163

Cost: £0.482 million / $1.928 million

Distribution of weights at normal displacement:

Armament: 13 tons, 0.8 %
Armour: 3 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 88 tons, 5.6 %
Hull, fittings & equipment: 690 tons, 43.4 %
Fuel, ammunition & stores: 494 tons, 31.1 %
Miscellaneous weights: 300 tons, 18.9 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 6,537 lbs / 2,965 Kg = 140.9 x 4.5 " / 115 mm shells or 2.1 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.6 ft / 0.5 m
Roll period: 13.0 seconds
Steadiness - As gun platform (Average = 50 %): 82 %
- Recoil effect (Restricted arc if above 1.00): 0.12
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has raised forecastle, low quarterdeck
Block coefficient: 0.465
Length to Beam Ratio: 7.66 : 1
'Natural speed' for length: 17.18 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 41
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: 22.15 ft / 6.75 m
- Forecastle (20 %): 20.51 ft / 6.25 m (19.69 ft / 6.00 m aft of break)
- Mid (50 %): 19.69 ft / 6.00 m
- Quarterdeck (50 %): 11.48 ft / 3.50 m (19.69 ft / 6.00 m before break)
- Stern: 11.48 ft / 3.50 m
- Average freeboard: 15.88 ft / 4.84 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 47.0 %
- Above water (accommodation/working, high = better): 220.6 %
Waterplane Area: 7,355 Square feet or 683 Square metres
Displacement factor (Displacement / loading): 272 %
Structure weight / hull surface area: 52 lbs/sq ft or 256 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.87
- Longitudinal: 3.84
- Overall: 1.01
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

Aviation fuel storage simmed as additional bunkers

True radius 7,000 nm on 217 tons of fuel; Aviation fuel stores - 220 tons

Breakdown of miscellaneous weight:

100 tons reserved for two aircraft handling cranes and deck gear
80 tons reserved for service workshops
80 tons reserved for spare aircrew accommodation
40 tons reserved for dry stores and spares

Lankiam – Laid down 1 January 1950
Loaita – Laid down 1 January 1950

Diskobre, Philippine Survey Ship laid down 1950

Displacement: 785 t light; 807 t standard; 897 t normal; 969 t full load

Dimensions: Length overall / water x beam x draught

188.78 ft / 180.45 ft x 35.43 ft x 11.48 ft (normal load) [57.54 m / 55.00 m x 10.80 m x 3.50 m]

Armament:

2 - 2.24" / 57.0 mm guns (1x2 guns), 5.65lbs / 2.56kg shells, 1950 Model Anti-aircraft guns in deck mount on centerline forward
4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1950 Model Machine guns in deck mounts on side, evenly spread
Weight of broadside 12 lbs / 5 kg
Shells per gun, main battery: 500

Armor:

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.39" / 10 mm 0.39" / 10 mm -

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 1,993 shp / 1,487 Kw = 16.00 kts
Range 9,000nm at 10.00 kts
Bunker at max displacement = 163 tons

Complement: 81 - 106

Cost: £0.277 million / $1.106 million

Distribution of weights at normal displacement:

Armament: 1 tons, 0.2 %
Armor: 1 tons, 0.1 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.1 %
- Armor Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 48 tons, 5.3 %
Hull, fittings & equipment: 635 tons, 70.8 %
Fuel, ammunition & stores: 112 tons, 12.5 %
Miscellaneous weights: 100 tons, 11.1 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 3,561 lbs / 1,615 Kg = 630.2 x 2.2 " / 57 mm shells or 2.4 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.4 ft / 0.4 m
Roll period: 12.7 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 1.52

Hull form characteristics:

Hull has rise forward of midbreak
Block coefficient: 0.428
Length to Beam Ratio: 5.09: 1
'Natural speed' for length: 13.43 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 37
Bow angle (Positive = bow angles forward): 16.00 degrees
Stern overhang: 4.10 ft / 1.25 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 14.76 ft / 4.50 m
- Forecastle (20 %): 12.30 ft / 3.75 m
- Mid (50 %): 12.30 ft / 3.75 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 11.27 ft / 3.44 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 32.4 %
- Above water (accommodation/working, high = better): 103.5 %
Waterplane Area: 4,008 Square feet or 372 Square meters
Displacement factor (Displacement / loading): 431 %
Structure weight / hull surface area: 99 lbs/sq ft or 485 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 2.05
- Longitudinal: 9.57
- Overall: 2.39
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

Breakdown of miscellaneous weight:

Deck cranes and handling gear - 40 tons
Work boats - 40 tons
Provision for special gear carried on deck - 20 tons

Diskobre – Laid down 1 January 1950
Mihagit – Laid down 1 January 1950

Kahupayan, Philippine Hospital Tender laid down 1950

Displacement: 750 t light; 768 t standard; 886 t normal; 980 t full load

Dimensions: Length overall / water x beam x draught

234.05 ft / 229.66 ft x 31.17 ft x 7.22 ft (normal load) [71.34 m / 70.00 m x 9.50 m x 2.20 m]

Machinery:

Diesel Internal combustion generators, Electric motors, 1 shaft, 1,487 shp / 1,109 Kw = 15.00 kts
Range 11,500nm at 10.00 kts
Bunker at max displacement = 213 tons

Complement: 80 - 105

Cost: £0.244 million / $0.977 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Machinery: 36 tons, 4.0 %
Hull, fittings & equipment: 304 tons, 34.4 %
Fuel, ammunition & stores: 136 tons, 15.3 %
Miscellaneous weights: 410 tons, 46.3 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,072 lbs / 940 Kg = 1,583.5 x 6 " / 152 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 64 %
- 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
Block coefficient: 0.600
Length to Beam Ratio: 7.37: 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 32
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: 16.40 ft / 5.00 m
- Forecastle (20 %): 13.29 ft / 4.05 m
- Mid (50 %): 10.66 ft / 3.25 m
- Quarterdeck (15 %): 10.66 ft / 3.25 m
- Stern: 10.66 ft / 3.25 m
- Average freeboard: 11.83 ft / 3.61 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 64.2 %
- Above water (accommodation/working, high = better): 137.4 %
Waterplane Area: 5,121 Square feet or 476 Square meters
Displacement factor (Displacement / loading): 184 %
Structure weight / hull surface area: 37 lbs/sq ft or 181 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.37
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, rides out heavy weather easily

Actual radius 3,000 nm on bunkers of 34 tons; Remaining 84 tons represents low-stowed cargo

Breakdown of miscellaneous weight

Deck gear (cranes, derricks, winches) - 10 tons
Accommodation space for medical personnel- 120 tons
Distilling plant - 15 tons
Operating theatre and hospital ward- 120 tons
Tropicalization - 20 tons
Consumable stores - 110 tons
Electrical plant - 15 tons


Kahupayan – Laid down 1 January 1950
Kaluoy – Laid down 1 January 1950

Maayon, Philippine Harbor Tug, laid down 1950

Displacement: 433 t light; 444 t standard; 488 t normal; 524 t full load

Dimensions: Length overall / water x beam x draught

179.36 ft / 173.88 ft x 30.02 ft x 6.23 ft (normal load) [54.67 m / 53.00 m x 9.15 m x 1.90 m]

Armament:

4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1950 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 0 lbs / 0 kg
Shells per gun, main battery: 3,000

Machinery: Diesel Internal combustion motors, Geared drive, 2 shafts, 646 shp / 482 Kw = 13.00 kts
Range 6,000nm at 10.00 kts
Bunker at max displacement = 80 tons

Complement: 51 - 67

Cost: £0.136 million / $0.543 million

Distribution of weights at normal displacement:

Armament: 0 tons, 0.0 %
Machinery: 15 tons, 3.2 %
Hull, fittings & equipment: 338 tons, 69.2 %
Fuel, ammunition & stores: 55 tons, 11.2 %
Miscellaneous weights: 80 tons, 16.4 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 3,695 lbs / 1,676 Kg = 59,113.6 x 0.5 " / 13mm shells or 2.5 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.1 ft / 0.3 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 68 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:

Hull has low quarterdeck
Block coefficient: 0.525
Length to Beam Ratio: 5.79: 1
'Natural speed' for length: 13.19 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 34
Bow angle (Positive = bow angles forward): 12.00 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 (15 %): 18.04 ft / 5.50 m
- Mid (25 %): 14.76 ft / 4.50 m
- Quarterdeck (60 %): 6.56 ft / 2.00 m (14.76 ft / 4.50 m before break)
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 10.50 ft / 3.20 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 29.8 %
- Above water (accommodation/working, high = better): 205.0 %
Waterplane Area: 3,559 Square feet or 331 Square meters
Displacement factor (Displacement / loading): 439 %
Structure weight / hull surface area: 63 lbs/sq ft or 309 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 1.47
- Longitudinal: 5.79
- Overall: 1.68
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

Two auxiliary diesel-electric generating sets - 20 tons each - total 40 tons
Provision for stowed towing cables and winch aft - 30 tons
Navigation and communications equipment - 10 tons

Maayon – Laid down 1 January 1950, launched 8 March 1950
Mambusao – Laid down 1 January 1950, launched 8 March 1950
Sapian – Laid down 1 January 1950, launched 8 March 1950
Sigma – Laid down 1 January 1950, launched 8 March 1950