WesWorld

Quoted from "BruceDuncan"

Overall I have no qualms about the design. My only thought is that it seems as if it is larger than it needs to be to fulfill its primary mission; if the tonnage could be brought down to below the 499 ton limit, the construction time would be substantially shortened, as well as effecting some economies.

Quoted

Long, China Minelayer laid down 1949

Displacement:
1.843 t light; 1.913 t standard; 2.500 t normal; 2.969 t full load

Dimensions: Length overall / water x beam x draught
244,12 ft / 238,85 ft x 45,28 ft x 14,76 ft (normal load)
74,41 m / 72,80 m x 13,80 m x 4,50 m

Armament:
2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1949 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread
3 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,89kg shells, 1949 Model
Anti-aircraft guns in deck mounts
on centreline, all aft
2 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,89kg shells, 1949 Model
Anti-aircraft guns in deck mounts
on side, all aft
6 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1949 Model
Machine guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 82 lbs / 37 kg
Shells per gun, main battery: 400

Armour:

- Conning tower: 0,79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2.741 shp / 2.045 Kw = 15,00 kts
Range 11.000nm at 15,00 kts
Bunker at max displacement = 1.057 tons

Complement:
176 - 229

Cost:
£0,629 million / $2,516 million

Distribution of weights at normal displacement:
Armament: 10 tons, 0,4%
Armour: 3 tons, 0,1%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 0 tons, 0,0%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 3 tons, 0,1%
Machinery: 66 tons, 2,7%
Hull, fittings & equipment: 1.063 tons, 42,5%
Fuel, ammunition & stores: 657 tons, 26,3%
Miscellaneous weights: 700 tons, 28,0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6.368 lbs / 2.888 Kg = 180,3 x 4,1 " / 105 mm shells or 2,3 torpedoes
Stability (Unstable if below 1.00): 1,09
Metacentric height 1,8 ft / 0,6 m
Roll period: 14,1 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- Recoil effect (Restricted arc if above 1.00): 0,03
Seaboat quality (Average = 1.00): 2,00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,548
Length to Beam Ratio: 5,28 : 1
'Natural speed' for length: 15,45 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19,69 ft / 6,00 m
- Forecastle (20%): 19,69 ft / 6,00 m
- Mid (50%): 11,15 ft / 3,40 m
- Quarterdeck (20%): 11,15 ft / 3,40 m
- Stern: 11,15 ft / 3,40 m
- Average freeboard: 14,14 ft / 4,31 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 44,0%
- Above water (accommodation/working, high = better): 108,3%
Waterplane Area: 7.533 Square feet or 700 Square metres
Displacement factor (Displacement / loading): 272%
Structure weight / hull surface area: 91 lbs/sq ft or 444 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,49
- Longitudinal: 5,29
- Overall: 1,69
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Misc. Weight (700tons):
120 tons for cranes and rails for mine stowing
20 tons for helicopter
50 tons helicopter pad and handling equipment
20 tons sonar
30 tons Degaussing system
60 tons future growth
400 tons mines (100 mines @ 4 tons)

true range: 4000sm at 15 kn / true bunker: 312 tons

low stowed cargo: 745 tons
480tons for 120 mines (@ 4 tons)
65tons for moving equipment in hull (rails, etc.)
200tons stowage