Than Tien-class, Indochinese Underway Replenishment Oiler laid down 1947
Displacement:
2,497 t light; 2,634 t standard; 5,333 t normal; 7,492 t full load
Dimensions: Length overall / water x beam x draught
400.54 ft / 393.70 ft x 50.20 ft x 16.08 ft (normal load)
122.08 m / 120.00 m x 15.30 m x 4.90 m
Armament:
4 - 2.24" / 57.0 mm guns (2x2 guns), 6.61lbs / 3.00kg shells, 1947 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
12 - 0.91" / 23.0 mm guns (6x2 guns), 0.37lbs / 0.17kg shells, 1947 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 31 lbs / 14 kg
Shells per gun, main battery: 1,500
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.59" / 15 mm 0.39" / 10 mm -
- Conning tower: 0.98" / 25 mm
Machinery:
Diesel Internal combustion generators,
Electric motors, 1 shaft, 3,830 shp / 2,857 Kw = 15.00 kts
Range 36,000nm at 15.00 kts
Bunker at max displacement = 4,858 tons
Complement:
311 - 405
Cost:
£0.753 million / $3.011 million
Distribution of weights at normal displacement:
Armament: 3 tons, 0.1 %
Armour: 13 tons, 0.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 6 tons, 0.1 %
Machinery: 95 tons, 1.8 %
Hull, fittings & equipment: 1,387 tons, 26.0 %
Fuel, ammunition & stores: 2,836 tons, 53.2 %
Miscellaneous weights: 1,000 tons, 18.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
21,229 lbs / 9,629 Kg = 3,757.0 x 2.2 " / 57 mm shells or 5.3 torpedoes
Stability (Unstable if below 1.00): 1.41
Metacentric height 3.2 ft / 1.0 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.588
Length to Beam Ratio: 7.84 : 1
'Natural speed' for length: 19.84 kts
Power going to wave formation at top speed: 32 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 2.50 ft / 0.76 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (20 %): 19.69 ft / 6.00 m (12.47 ft / 3.80 m aft of break)
- Mid (50 %): 12.47 ft / 3.80 m
- Quarterdeck (20 %): 19.69 ft / 6.00 m (12.47 ft / 3.80 m before break)
- Stern: 19.69 ft / 6.00 m
- Average freeboard: 15.75 ft / 4.80 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 28.8 %
- Above water (accommodation/working, high = better): 106.5 %
Waterplane Area: 13,945 Square feet or 1,296 Square metres
Displacement factor (Displacement / loading): 434 %
Structure weight / hull surface area: 64 lbs/sq ft or 311 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.44
- Overall: 1.03
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 Miscellaneous Weights:
- 5t for Navigational Radar
- 995t for Naval Stores
Ships in Class:
- Than Tien: laid down 1/1/1947, completed 10/21/1947.
- Thien Kich: laid down 1/1/1948, completed 10/21/1948.