Dagu - Class
Patrolboat
Displacement:
273 t light; 282 t standard; 312 t normal; 336 t full load
Dimensions:
Length overall / water x beam x draught
167,00 ft / 164,70 ft x 22,97 ft x 7,22 ft (normal load)
50,90 m / 50,20 m x 7,00 m x 2,20 m
Armament:
2 - 3,00" / 76,2 mm guns in single mounts, 13,50lbs / 6,12kg shells, 1932 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
1 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,88kg shells, 1932 Model
Anti-aircraft gun in deck mount
on side amidships
3 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1932 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 30 lbs / 13 kg
Shells per gun, main battery: 150
Armour:
- Conning tower: 0,59" / 15 mm
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2.527 shp / 1.885 Kw = 20,00 kts
Range 3.000nm at 12,00 kts
Bunker at max displacement = 54 tons
Complement:
36 - 48
Cost:
£0,105 million / $0,420 million
Distribution of weights at normal displacement:
Armament: 4 tons, 1,2%
Armour: 1 tons, 0,2%
- 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, 0,2%
Machinery: 75 tons, 23,9%
Hull, fittings & equipment: 164 tons, 52,6%
Fuel, ammunition & stores: 39 tons, 12,5%
Miscellaneous weights: 30 tons, 9,6%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
487 lbs / 221 Kg = 36,1 x 3,0 " / 76 mm shells or 0,4 torpedoes
Stability (Unstable if below 1.00): 1,06
Metacentric height 0,6 ft / 0,2 m
Roll period: 12,3 seconds
Steadiness - As gun platform (Average = 50 %): 69 %
- Recoil effect (Restricted arc if above 1.00): 0,11
Seaboat quality (Average = 1.00): 1,25
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,400
Length to Beam Ratio: 7,17 : 1
'Natural speed' for length: 12,83 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 55
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: 10,83 ft / 3,30 m
- Forecastle (20%): 9,84 ft / 3,00 m
- Mid (50%): 8,99 ft / 2,74 m
- Quarterdeck (15%): 8,99 ft / 2,74 m
- Stern: 8,99 ft / 2,74 m
- Average freeboard: 9,37 ft / 2,86 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 97,6%
- Above water (accommodation/working, high = better): 113,2%
Waterplane Area: 2.328 Square feet or 216 Square metres
Displacement factor (Displacement / loading): 149%
Structure weight / hull surface area: 38 lbs/sq ft or 186 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,04
- Longitudinal: 5,75
- Overall: 1,24
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily
Breakdown of Miscellaneous Weights:
30 tons for ASW equipment (2xDCT; 4xDCP)
------------
Ships in Class:
HICMS Dagu 300; laid down 1932
HICMS Dagu 301; laid down 1932
HICMS Dagu 302; laid down 1932
HICMS Dagu 303; laid down 1932
HICMS Dagu 304; laid down 1933
HICMS Dagu 305; laid down 1933
HICMS Dagu 306; laid down 1933
HICMS Dagu 307; laid down 1934
HICMS Dagu 308; laid down 1934
HICMS Dagu 309; laid down 1935
HICMS Dagu 310; laid down 1935
HICMS Dagu 311; laid down 1935
HICMS Dagu 312; laid down 1935
HICMS Dagu 313; laid down 1936
HICMS Dagu 314; laid down 1936
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