WesWorld

Repository for information pertaining to the subject.

The Philippine Navy's force of harbor tug is relatively small, and certainly getting a bit on the old side. A fresh, more capable design has been proposed to supplement, or even replace, the existing Capiz class.

TBD, 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

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

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

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