WesWorld

Respository for data pertaining to the subject vessels

(Historical data)

Carries 40 1,500lb mines.

Tapang-class Filipino minelayer laid down 1934

Displacement: 387 t light; 397 t standard; 418 t normal; 435 t full load

Dimensions: Length overall / water x beam x draught

157.48 ft / 157.48 ft x 19.69 ft x 7.87 ft (normal load) [48.00 m / 48.00 m x 6.00 m x 2.40 m]

Armament:

2 - 2.95" / 75.0 mm guns in single mounts, 13.23lbs / 6.00kg shells, 1933 Model Dual purpose guns in deck mounts with hoists on centreline ends, evenly spread
2 - 1.38" / 35.0 mm guns (1x2 guns), 1.32lbs / 0.60kg shells, 1933 Model Anti-aircraft guns in deck mount on centreline forward, all raised guns - superfiring
4 - 0.54" / 13.7 mm guns in single mounts, 0.11lbs / 0.05kg shells, 1933 Model Machine guns in deck mounts on side, evenly spread
Weight of broadside 30 lbs / 13 kg
Shells per gun, main battery: 120

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.39" / 10 mm -
2nd: 0.79" / 20 mm - -
3rd: 0.39" / 10 mm - -

Machinery:

Oil fired boilers, simple reciprocating steam engines, Direct drive, 2 shafts, 1,240 ihp / 925 Kw = 15.70 kts
Range 2,000nm at 10.00 kts
Bunker at max displacement = 38 tons

Complement: 46 - 60

Cost: £0.176 million / $0.703 million

Distribution of weights at normal displacement:

Armament: 4 tons, 0.9 %
Armour: 4 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 4 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 147 tons, 35.2 %
Hull, fittings & equipment: 132 tons, 31.5 %
Fuel, ammunition & stores: 31 tons, 7.5 %
Miscellaneous weights: 100 tons, 23.9 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 241 lbs / 109 Kg = 18.7 x 3.0 " / 75 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.5 ft / 0.2 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.25
Seaboat quality (Average = 1.00): 1.79

Hull form characteristics:

Hull has rise forward of midbreak
Block coefficient: 0.600
Length to Beam Ratio: 8.00: 1
'Natural speed' for length: 12.55 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 29
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: 13.45 ft / 4.10 m
- Forecastle (20 %): 9.19 ft / 2.80 m
- Mid (55 %): 9.19 ft / 2.80 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 9.08 ft / 2.77 m
Ship tends to be wet forward

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 146.2 %
- Above water (accommodation/working, high = better): 82.0 %
Waterplane Area: 2,267 Square feet or 211 Square metres
Displacement factor (Displacement / loading): 95 %
Structure weight / hull surface area: 29 lbs/sq ft or 142 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.85
- Longitudinal: 4.31
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Excellent seaboat, comfortable, can fire her guns in the heaviest weather


Tapang, Laid down 1934, completed 1935
Tigas, Laid down 1935, completed 1935
Tibey, Laid down 1934, completed 1935
Taer, Laid down 1935, completed 1935
Tibayan, Laid down 1935, completed 1935
Tumibay, Laid down 1935, completed 1935

Calopan, Philippine Coastal Minelayer laid down 1947

Displacement: 474 t light; 499 t standard; 590 t normal; 663 t full load

Dimensions: Length overall / water x beam x draught

203.32 ft / 196.85 ft x 24.61 ft x 8.20 ft (normal load) [61.97 m / 60.00 m x 7.50 m x 2.50 m]

Armament:

4 - 2.24" / 57.0 mm guns (2x2 guns), 5.65lbs / 2.56kg shells, 1947 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
2 - 1.38" / 35.0 mm guns in single mounts, 1.31lbs / 0.59kg shells, 1947 Model Anti-aircraft guns in deck mounts on side, all amidships
Weight of broadside 25 lbs / 11 kg
Shells per gun, main battery: 900

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, 3,630 shp / 2,708 Kw = 20.00 kts
Range 4,800nm at 14.00 kts
Bunker at max displacement = 163 tons

Complement: 59 - 77

Cost: £0.231 million / $0.925 million

Distribution of weights at normal displacement:

Armament: 3 tons, 0.5 %
Armour: 5 tons, 0.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 90 tons, 15.2 %
Hull, fittings & equipment: 286 tons, 48.6 %
Fuel, ammunition & stores: 116 tons, 19.7 %
Miscellaneous weights: 90 tons, 15.3 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,210 lbs / 549 Kg = 214.2 x 2.2 " / 57 mm shells or 0.7 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 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 1.80

Hull form characteristics:

Hull has a flush deck
Block coefficient: 0.520
Length to Beam Ratio: 8.00: 1
'Natural speed' for length: 14.03 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 32
Bow angle (Positive = bow angles forward): 19.00 degrees
Stern overhang: 0.82 ft / 0.25 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.40 ft / 5.00 m
- Forecastle (30 %): 13.78 ft / 4.20 m
- Mid (50 %): 10.83 ft / 3.30 m
- Quarterdeck (35 %): 10.83 ft / 3.30 m
- Stern: 10.83 ft / 3.30 m
- Average freeboard: 12.32 ft / 3.76 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 72.9 %
- Above water (accommodation/working, high = better): 123.8 %
Waterplane Area: 3,286 Square feet or 305 Square metres
Displacement factor (Displacement / loading): 197 %
Structure weight / hull surface area: 41 lbs/sq ft or 198 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.01
- Longitudinal: 7.60
- Overall: 1.24
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 One-Hundred 500 kg sea mines - 50 tons
Provision for two mine rails @ 15 tons each - 30 tons
Tropicalization - 10 tons


Calopan – Laid down 1 January 1947; Launched 4 March 1947; Completed 16 May 1947
San Teodoro – Laid down 1 January 1947; Launched 4 March 1947; Completed 16 May 1947
Calintan - Laid down 1 April 1947; Launched 2 June 1947; Completed 14 August 1947
San Jose - Laid down 1 April 1947; Launched 2 June 1947; Completed 14 August 1947
Cagayancilo - Laid down 1 July 1947; Launched 1 September 1947; Completed 13 November 1947
San Vicente - Laid down 1 July 1947; Launched 1 September 1947; Completed 13 November 1947
Caloocan - Laid down 1 October 1947; Launched 2 December 1947; Completed 13 February 1948
San Pablo - Laid down 1 October 1947; Launched 2 December 1947; Completed 13 February 1948