Hechao Class, Yan Shijie frigate, laid down 1960
Primary role: ASW picket
Secondary role: Radar & electronic warfare picket
Displacement:
2,091 t light; 2,137 t standard; 2,331 t normal; 2,487 t full load
Dimensions: Length overall / water x beam x draught
377.30 ft / 377.30 ft x 41.00 ft x 12.50 ft (normal load)
115.00 m / 115.00 m x 12.50 m x 3.81 m
Armament:
1 RUR-5 ASROC launcher, 8 cells
32 reloads below deck
2 RUR-4H Weapon DELTA turret (Heavily modified Weapon-Alpha, works in conjunction with ASROC)
80 reloads stowed aft, 60 reloads stored forward
2 3 tube 324mm torpedo launchers
12 Mk 9 depth charges
Sonar:
1 bow array
6 flank arrays
1 towed-stern array
127 sonar buoys (active & passive)
Machinery:
CNG powered COGAS propulsion,
Geared drive, 2 shafts, 41,096 shp / 30,658 Kw = 33.50 kts
Range 2,000nm at 21.00 kts
Bunker at max displacement = 349 tons
Complement:
87 - 118
Cost:
$366.593 million FY'2010 USD
Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 983 tons, 42.2 %
Hull, fittings & equipment: 958 tons, 41.1 %
Fuel, ammunition & stores: 241 tons, 10.3 %
Miscellaneous weights: 150 tons, 6.4 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,758 lbs / 798 Kg = 16.3 x 6 " / 152 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.35
Metacentric height 2.2 ft / 0.7 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %): 66 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.53
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.422
Length to Beam Ratio: 9.20 : 1
'Natural speed' for length: 22.55 kts
Power going to wave formation at top speed: 67 %
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: 21.37 ft / 6.51 m
- Forecastle (20 %): 13.60 ft / 4.15 m
- Mid (50 %): 13.60 ft / 4.15 m
- Quarterdeck (15 %): 13.60 ft / 4.15 m
- Stern: 13.60 ft / 4.15 m
- Average freeboard: 14.22 ft / 4.33 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 143.6 %
- Above water (accommodation/working, high = better): 155.5 %
Waterplane Area: 10,026 Square feet or 931 Square metres
Displacement factor (Displacement / loading): 110 %
Structure weight / hull surface area: 60 lbs/sq ft or 293 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.83
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent