(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