Luhan - Class (ex Filipino Ajo-class)
Torpedoboat
as laid down:
Displacement:
600 t light; 615 t standard; 694 t normal; 758 t full load
Dimensions:
Length overall / water x beam x draught
237.76 ft / 235.00 ft x 23.50 ft x 11.00 ft (normal load)
72.47 m / 71.63 m x 7.16 m x 3.35 m
Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 14.00lbs / 6.35kg shells, 1922 Model
Quick firing gun in a deck mount with a hoist
on centreline forward
2 - 1.57" / 40.0 mm guns (1x2 guns), 2.00lbs / 0.91kg shells, 1922 Model
Anti-aircraft guns in a deck mount
on centreline aft
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1922 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 18 lbs / 8 kg
Shells per gun, main battery: 150
8 - 18.0" / 457.2 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm - -
2nd: 0.50" / 13 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 10,403 shp / 7,760 Kw = 26.25 kts
Range 1,030nm at 21.00 kts (Bunkerage = 142 tons)
Complement:
9 officers and 68 men
Cost:
£0.192 million / $0.768 million
Distribution of weights at normal displacement:
Armament: 2 tons, 0.3 %
Armour: 2 tons, 0.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 340 tons, 49.0 %
Hull, fittings & equipment: 256 tons, 36.8 %
Fuel, ammunition & stores: 95 tons, 13.6 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
316 lbs / 143 Kg = 23.4 x 3.0 " / 76 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 0.7 ft / 0.2 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.06
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.400
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 15.33 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 53
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13.00 ft / 3.96 m
- Forecastle (20 %): 10.00 ft / 3.05 m
- Mid (50 %): 10.00 ft / 3.05 m
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 10.24 ft / 3.12 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 160.8 %
- Above water (accommodation/working, high = better): 26.2 %
Waterplane Area: 3,399 Square feet or 316 Square metres
Displacement factor (Displacement / loading): 96 %
Structure weight / hull surface area: 35 lbs/sq ft or 172 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.80
- Longitudinal: 3.33
- Overall: 0.92
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is extremely poor
------------
after 25% refit:
Displacement:
608 t light; 628 t standard; 694 t normal; 748 t full load
Dimensions:
Length overall / water x beam x draught
237,76 ft / 235,00 ft x 23,50 ft x 11,00 ft (normal load)
72,47 m / 71,63 m x 7,16 m x 3,35 m
Armament:
2 - 4,13" / 105 mm guns (1x2 guns), 35,32lbs / 16,02kg shells, 1940 Model
Breech loading guns in a deck mount with hoist
on centreline forward
4 - 1,57" / 40,0 mm guns (2x2 guns), 1,95lbs / 0,89kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships
4 - 0,50" / 12,7 mm guns (2x2 guns), 0,06lbs / 0,03kg shells, 1922 Model
Machine guns in deck mounts
on side, evenly spread, 1 raised mount
Weight of broadside 79 lbs / 36 kg
Shells per gun, main battery: 120
8 - 21,8" / 553 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,98" / 25 mm - -
2nd: 0,51" / 13 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 10.403 shp / 7.760 Kw = 26,25 kts
Range 1.030nm at 21,00 kts
Bunker at max displacement = 120 tons
Complement:
66 - 87
Cost:
£0,187 million / $0,747 million
Distribution of weights at normal displacement:
Armament: 10 tons, 1,4%
Armour: 4 tons, 0,6%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 4 tons, 0,6%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 278 tons, 40,1%
Hull, fittings & equipment: 306 tons, 44,0%
Fuel, ammunition & stores: 86 tons, 12,4%
Miscellaneous weights: 10 tons, 1,4%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
331 lbs / 150 Kg = 9,4 x 4,1 " / 105 mm shells or 0,2 torpedoes
Stability (Unstable if below 1.00): 0,95
Metacentric height 0,5 ft / 0,2 m
Roll period: 13,8 seconds
Steadiness - As gun platform (Average = 50 %): 49 %
- Recoil effect (Restricted arc if above 1.00): 0,43
Seaboat quality (Average = 1.00): 0,97
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,400
Length to Beam Ratio: 10,00 : 1
'Natural speed' for length: 15,33 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 12,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13,00 ft / 3,96 m
- Forecastle (20%): 10,00 ft / 3,05 m
- Mid (50%): 10,00 ft / 3,05 m
- Quarterdeck (15%): 10,00 ft / 3,05 m
- Stern: 10,00 ft / 3,05 m
- Average freeboard: 10,24 ft / 3,12 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 142,0%
- Above water (accommodation/working, high = better): -7,2%
Waterplane Area: 3.399 Square feet or 316 Square metres
Displacement factor (Displacement / loading): 107%
Structure weight / hull surface area: 42 lbs/sq ft or 205 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,86
- Longitudinal: 3,83
- Overall: 1,00
Caution: Poor stability - excessive risk of capsizing
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is extremely poor
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather
------------
Ships in Class:
HICMS Luhan-01; laid down 1922; refit 1940
HICMS Luhan-02; laid down 1922; refit 1940
HICMS Luhan-03; laid down 1922; refit 1940