Kaivan class patrol boats
((Ex Chien Kang, China Destroyer laid down 1912 (refit 1936))
Kaivan, deleted 1944
Keyon, deleted 1944
Displacement:
348 t light; 359 t standard; 411 t normal; 452 t full load
Dimensions: Length overall / water x beam x draught
198,00 ft / 198,00 ft x 22,00 ft x 6,00 ft (normal load)
60,35 m / 60,35 m x 6,71 m x 1,83 m
Armament:
2 - 2,99" / 76,0 mm guns in single mounts, 13,39lbs / 6,08kg shells, 1912 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
4 - 0,98" / 25,0 mm guns (2x2 guns), 0,48lbs / 0,22kg shells, 1912 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 29 lbs / 13 kg
Shells per gun, main battery: 150
Machinery:
Coal fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 8.892 ihp / 6.633 Kw = 26,00 kts
Range 3.000nm at 10,00 kts
Bunker at max displacement = 94 tons (100% coal)
Caution: Delicate, lightweight machinery
Complement:
45 - 59
Cost:
£0,047 million / $0,188 million
Distribution of weights at normal displacement:
Armament: 4 tons, 0,9%
Machinery: 228 tons, 55,5%
Hull, fittings & equipment: 116 tons, 28,3%
Fuel, ammunition & stores: 63 tons, 15,3%
Miscellaneous weights: 0 tons, 0,0%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
137 lbs / 62 Kg = 10,2 x 3,0 " / 76 mm shells or 0,2 torpedoes
Stability (Unstable if below 1.00): 1,59
Metacentric height 1,1 ft / 0,3 m
Roll period: 8,7 seconds
Steadiness - As gun platform (Average = 50 %): 41 %
- Recoil effect (Restricted arc if above 1.00): 0,07
Seaboat quality (Average = 1.00): 0,67
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,550
Length to Beam Ratio: 9,00 : 1
'Natural speed' for length: 14,07 kts
Power going to wave formation at top speed: 73 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 15,48 ft / 4,72 m
- Forecastle (20%): 9,85 ft / 3,00 m
- Mid (50%): 9,85 ft / 3,00 m
- Quarterdeck (15%): 9,85 ft / 3,00 m
- Stern: 9,85 ft / 3,00 m
- Average freeboard: 10,30 ft / 3,14 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 186,0%
- Above water (accommodation/working, high = better): 126,7%
Waterplane Area: 3.040 Square feet or 282 Square metres
Displacement factor (Displacement / loading): 34%
Structure weight / hull surface area: 20 lbs/sq ft or 96 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,51
- Longitudinal: 2,57
- Overall: 0,60
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Caution: Lacks seaworthiness - very limited seakeeping ability