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Long Dao-class, Indochinese Coastal Depot Ship laid down 1946

Displacement:
765 t light; 794 t standard; 886 t normal; 959 t full load

Dimensions: Length overall / water x beam x draught
235.75 ft / 229.66 ft x 31.17 ft x 7.22 ft (normal load)
71.86 m / 70.00 m x 9.50 m x 2.20 m

Armament:
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.89kg shells, 1946 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread
8 - 0.91" / 23.0 mm guns (4x2 guns), 0.37lbs / 0.17kg shells, 1946 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 11 lbs / 5 kg
Shells per gun, main battery: 1,500

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.59" / 15 mm 0.20" / 5 mm -
2nd: 0.59" / 15 mm 0.20" / 5 mm -

- Conning tower: 0.59" / 15 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,487 shp / 1,109 Kw = 15.00 kts
Range 3,000nm at 15.00 kts
Bunker at max displacement = 165 tons

Complement:
80 - 105

Cost:
£0.235 million / $0.939 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.2 %
Armour: 3 tons, 0.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.1 %
Machinery: 37 tons, 4.2 %
Hull, fittings & equipment: 303 tons, 34.2 %
Fuel, ammunition & stores: 121 tons, 13.7 %
Miscellaneous weights: 420 tons, 47.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,916 lbs / 869 Kg = 980.9 x 1.6 " / 40 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 62 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 7.37 : 1
'Natural speed' for length: 15.15 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 31
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 16.73 ft / 5.10 m
- Forecastle (23 %): 13.45 ft / 4.10 m
- Mid (45 %): 10.17 ft / 3.10 m
- Quarterdeck (15 %): 10.17 ft / 3.10 m
- Stern: 10.17 ft / 3.10 m
- Average freeboard: 11.57 ft / 3.53 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 68.4 %
- Above water (accommodation/working, high = better): 134.1 %
Waterplane Area: 5,235 Square feet or 486 Square metres
Displacement factor (Displacement / loading): 174 %
Structure weight / hull surface area: 37 lbs/sq ft or 181 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.23
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Breakdown of Miscellaneous Weights:
- 2 tons for DRBN-1 navigational surface and air search radar
- 18 tons for high test crane and winch
- 100 tons for barracks (space for 50 men)
- 15 tons for water distilling plant
- 15 tons for air conditioning
- 120 tons for command spaces
- 50 tons for workshops
- 10 tons for consumable stores

Ships in Class:
- Long Dao: Laid down Q1/1946, completed Q4/1946.
- Than Tien: Laid down Q3/1946, completed Q2/1947.
- Thien Kich: Laid down Q1/1947, completed Q4/1947.