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1

Friday, March 27th 2015, 3:42pm

Indochinese Ships for 1946

I think the next stage of development for the Indochinese naval forces is to pick up a few more auxiliaries in order to support their coastal forces. Currently, I'm building the Indochinese Naval Patrol to have three geographic zones, each with (approximately) two subchaser flotillas, a coastal minesweeper flotilla, an MTB flotilla, and a coastal base-command ship. This design is proposed for the base-ship: it's a coastal freighter with a mix of barracks area, disposable stores stowage, low-end maintenance workshops, and offices/communications for senior squadron and flotilla officers.

Worth my time? Too large, too small? Or should the Indochinese just stick with shore establishments?

Quoted

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.

2

Friday, March 27th 2015, 4:20pm

On a technical basis, I like the design. It is something that the Philippines finds inspirational.

Whether Indochina needs it is a different question. If you are going to be moving units from port to port on a regular basis it might; if units are going to be tied to a single base, such facilities would be better provided ashore, particularly as Indochina has decent naval infrastructure. Now, if Indochinese units were deployed to say the Paracel Islands, they would be invaluable.

3

Friday, March 27th 2015, 8:00pm

With that in mind, perhaps three vessels would be unnecessarily extravagant...

4

Saturday, March 28th 2015, 2:10pm

I think one vessel would be sufficient to support operations away from home base. It's always good to have a back up in case a base becomes unoperational or if you want to make use of a sheltered cove somewhere.