In order to continue the buildup of Indochina's Patrouille Navale, I am considering building an octet of these wood-hulled light subchasers for coastal work.

## Quoted

[SIZE=3][/SIZE]Cam Ranh-class, Indochinese Submarine Chaser laid down 1944

Displacement:

125 t light; 133 t standard; 165 t normal; 190 t full load

Dimensions:Length overall / water x beam x draught

120.42 ft / 114.83 ft x 18.37 ft x 6.07 ft (normal load)

36.71 m / 35.00 m x 5.60 m x 1.85 m

Armament:

1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1944 Model

Dual purpose gun in deck mount

on centreline forward

2 - 0.91" / 23.0 mm guns in single mounts, 0.37lbs / 0.17kg shells, 1944 Model

Machine guns in deck mounts

on side, all amidships

2 - 0.91" / 23.0 mm guns (1x2 guns), 0.37lbs / 0.17kg shells, 1944 Model

Machine guns in deck mount

on centreline aft

Weight of broadside 14 lbs / 7 kg

Shells per gun, main battery: 500

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 0.59" / 15 mm 0.20" / 5 mm -

- Conning tower: 0.59" / 15 mm

Machinery:

Diesel Internal combustion motors,

Geared drive, 2 shafts, 1,100 shp / 820 Kw = 18.00 kts

Range 3,000nm at 15.00 kts

Bunker at max displacement = 58 tons

Complement:

22 - 29

Cost:

£0.066 million / $0.264 million

Distribution of weights at normal displacement:

Armament: 2 tons, 1.1 %

Armour: 1 tons, 0.6 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 1 tons, 0.4 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.2 %

Machinery: 28 tons, 17.1 %

Hull, fittings & equipment: 69 tons, 41.9 %

Fuel, ammunition & stores: 40 tons, 24.1 %

Miscellaneous weights: 25 tons, 15.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

316 lbs / 143 Kg = 24.6 x 3.0 " / 75 mm shells or 0.4 torpedoes

Stability (Unstable if below 1.00): 1.10

Metacentric height 0.5 ft / 0.1 m

Roll period: 11.2 seconds

Steadiness - As gun platform (Average = 50 %): 52 %

- Recoil effect (Restricted arc if above 1.00): 0.10

Seaboat quality (Average = 1.00): 1.27

Hull form characteristics:

Hull has rise aft of midbreak

and transom stern

Block coefficient: 0.450

Length to Beam Ratio: 6.25 : 1

'Natural speed' for length: 12.84 kts

Power going to wave formation at top speed: 70 %

Trim (Max stability = 0, Max steadiness = 100): 41

Bow angle (Positive = bow angles forward): 10.00 degrees

Stern overhang: 3.28 ft / 1.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 13.12 ft / 4.00 m

- Forecastle (20 %): 10.66 ft / 3.25 m

- Mid (50 %): 6.56 ft / 2.00 m (8.20 ft / 2.50 m aft of break)

- Quarterdeck (15 %): 8.20 ft / 2.50 m

- Stern: 8.20 ft / 2.50 m

- Average freeboard: 9.01 ft / 2.75 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 83.0 %

- Above water (accommodation/working, high = better): 101.6 %

Waterplane Area: 1,398 Square feet or 130 Square metres

Displacement factor (Displacement / loading): 170 %

Structure weight / hull surface area: 23 lbs/sq ft or 115 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.78

- Longitudinal: 10.10

- Overall: 1.00

Hull space for machinery, storage, compartmentation is excellent

Room for accommodation and workspaces is adequate

Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weights:

- 2 tons for DRBN-1 navigational DEM (radar)

- 3 tons for DUBV-8 sonar

- 15 tons for depth bombs

- 5 tons for ASW mortars (Mousetrap equivalent)

The inclusion of a transom stern on such a small and relatively slow craft seems somewhat odd to me, but I can understand why it may have been chosen.

What is more surprising is that there would be a rise**aft ** of the midbreak, rather than forward. Is that a deliberate choice?

What is more surprising is that there would be a rise

This post has been edited 1 times, last edit by "BruceDuncan" (Jul 5th 2013, 4:22am)

## Quoted

[SIZE=3][/SIZE]Cam Ranh-class, Indochinese Submarine Chaser laid down 1944

Displacement:

125 t light; 133 t standard; 165 t normal; 190 t full load

Dimensions:Length overall / water x beam x draught

120.42 ft / 114.83 ft x 18.37 ft x 6.07 ft (normal load)

36.71 m / 35.00 m x 5.60 m x 1.85 m

Armament:

1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1944 Model

Dual purpose gun in deck mount

on centreline forward

2 - 0.91" / 23.0 mm guns in single mounts, 0.37lbs / 0.17kg shells, 1944 Model

Machine guns in deck mounts

on side, all amidships

2 - 0.91" / 23.0 mm guns (1x2 guns), 0.37lbs / 0.17kg shells, 1944 Model

Machine guns in deck mount

on centreline aft

Weight of broadside 14 lbs / 7 kg

Shells per gun, main battery: 500

Armour:

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)

Main: 0.59" / 15 mm 0.20" / 5 mm -

- Conning tower: 0.59" / 15 mm

Machinery:

Diesel Internal combustion motors,

Geared drive, 2 shafts, 1,100 shp / 820 Kw = 18.00 kts

Range 3,000nm at 15.00 kts

Bunker at max displacement = 58 tons

Complement:

22 - 29

Cost:

£0.066 million / $0.264 million

Distribution of weights at normal displacement:

Armament: 2 tons, 1.1 %

Armour: 1 tons, 0.6 %

- Belts: 0 tons, 0.0 %

- Torpedo bulkhead: 0 tons, 0.0 %

- Armament: 1 tons, 0.4 %

- Armour Deck: 0 tons, 0.0 %

- Conning Tower: 0 tons, 0.2 %

Machinery: 28 tons, 17.1 %

Hull, fittings & equipment: 69 tons, 41.9 %

Fuel, ammunition & stores: 40 tons, 24.1 %

Miscellaneous weights: 25 tons, 15.2 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship):

318 lbs / 144 Kg = 24.7 x 3.0 " / 75 mm shells or 0.4 torpedoes

Stability (Unstable if below 1.00): 1.10

Metacentric height 0.5 ft / 0.1 m

Roll period: 11.2 seconds

Steadiness - As gun platform (Average = 50 %): 52 %

- Recoil effect (Restricted arc if above 1.00): 0.10

Seaboat quality (Average = 1.00): 1.27

Hull form characteristics:

Hull has a flush deck

and transom stern

Block coefficient: 0.450

Length to Beam Ratio: 6.25 : 1

'Natural speed' for length: 12.84 kts

Power going to wave formation at top speed: 70 %

Trim (Max stability = 0, Max steadiness = 100): 41

Bow angle (Positive = bow angles forward): 10.00 degrees

Stern overhang: 3.28 ft / 1.00 m

Freeboard (% = measuring location as a percentage of overall length):

- Stem: 13.12 ft / 4.00 m

- Forecastle (20 %): 10.50 ft / 3.20 m

- Mid (50 %): 7.87 ft / 2.40 m

- Quarterdeck (15 %): 7.87 ft / 2.40 m

- Stern: 7.87 ft / 2.40 m

- Average freeboard: 9.00 ft / 2.74 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 83.0 %

- Above water (accommodation/working, high = better): 102.6 %

Waterplane Area: 1,398 Square feet or 130 Square metres

Displacement factor (Displacement / loading): 170 %

Structure weight / hull surface area: 24 lbs/sq ft or 115 Kg/sq metre

Hull strength (Relative):

- Cross-sectional: 0.77

- Longitudinal: 10.06

- Overall: 1.00

Hull space for machinery, storage, compartmentation is excellent

Room for accommodation and workspaces is adequate

Good seaboat, rides out heavy weather easily

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