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1

Tuesday, May 8th 2012, 5:25pm

Indochinese Light Combatants

Riverine Gunboats
Vedette FOM 8m
- 11 in service

Vedette FOM 11m
- 11 in service

Motor Torpedo Boats
Vedette Rapide 23m
- 8 in service: MTB-1, MTB-2, MTB-3, MTB-4, MTB-5, MTB-6, MTB-7, MTB-8

Patrol Craft
Patrouilleur léger Type 1941
- 4 in service: PL-1, PL-2, PL-3, PL-4

CSM-81 Class Subchaser
- 50 in service: Kon Tum, Phu Tho, Tra Vinh, Tien Giang, Quang Binh, Dong Nai, Dien Bien, Ha Giang, Lai Chau, Binh Duong, Son La, Soc Trang, Vinh Phuc, Cao Bang, Nam Dinh, Ha Tinh, Ben Tre, Vinh Long, Thai Binh, Dong Thap, An Giang, Quang Tri, Kien Giang, Ba Ria-Vung Tau, Gia Lai, Yen Bai, Hau Giang, Binh Binh, Hoa Binh, Ninh Binh, Hung Yen, Thai Nguyen, Tay Ninh, Nghe An, Binh Phuoc, Bac Lieu, Lam Dong, Quang Ninh, Dak Lak, Hain Duong, Dak Nong, Bac Ninh, Ca Mau, Bac Kan, Phu Yen, Long An, Lao Cai, Tuyen Quang, Thanh Hoa, Quang Nam

Cam Ranh Class Subchaser
- Cam Ranh: Built Q1/1944.
- Da Nang: Built Q1/1944.
- Thi Nai: Built Q2/1944.
- Vung Tau: Built Q3/1944.
- Qhi Nhon: Built Q4/1945.
- Nha Trang: Built Q1/1946.
- My Tho: Built Q2/1946.
- Can Tho: Built Q3/1946.

Minesweepers
HQ-01-class Coastal Minesweepers
- 16 in service: HQ-01, HQ-02, HQ-03, HQ-04, HQ-05, HQ-06, HQ-07, HQ-08, HQ-09, HQ-10, HQ-11, HQ-12, HQ-12, HQ-14, HQ-15, HQ-16

2

Tuesday, May 8th 2012, 5:26pm



Vedette FOM 8m
Displacement: 8 tonnes
Length: 8 m
Width: 2.75 m
Draught: 0.80 m
Machinery: one Renault diesel, 70 hp
Speed: 7-8 knots
Crew: 5-6 men
Armament: one 12.7mm machine gun, two Reibel 7.5mm machine guns and two rifle-grenade launchers
Quantity: France (4), Indochina (Patrouille Navale) (11)

3

Tuesday, May 8th 2012, 5:26pm



Vedette FOM 11m
Displacement: 12 tonnes
Length: 11 m
Width: 3 m
Draught: 1.10 m
Machinery: two Renault diesel, 70 hp
Speed: 11 knots
Crew: 7-8 men
Transport capacity: 6-8 men (exceptionally)
Armament: two 12.7mm machine guns (or one machine gun and one 60mm mortar), two Reibel 7.5mm machine guns and two rifle-grenade launchers
Quantity: France (4), Indochina (Patrouille Navale) (11)

4

Tuesday, May 8th 2012, 5:29pm

Vedette Rapide 23m
Displacement: 45 tonnes
Length: 23 m
Beam: 5.8 m
Draught: 1.5 m
Machinery: 2 Clerget 16Hd marine diesel engines, both of 1,915hp; two shafts
Speed: 44 knots
Cruising range: 1100nm at 25 knots
Crew: 16 men
Armament:
- 1 x 40mm AA guns aft
- 1 x 20mm HS.404 cannon aft
- 2 x 550mm torpedoes
Notes: Built in Cherbourg
MTB-1 through MTB-8 in service.

5

Tuesday, May 8th 2012, 5:30pm

Patrouilleur léger Type 1941
Displacement: 48 tonnes (light), 56 tonnes (loaded)
Length: 22 m (72.18 ft) waterline; 23.75 m (77.9 ft) overall
Beam: 4.9 m (16 ft)
Draught: 1.4 m (4.6 ft) full load
Machinery: 2 x 225hp Renault marine diesel engines; 2 shafts
Speed: 14 knots
Cruising range: 1200 nm at 12 knots
Crew: 13 men
Armament:
- 2 x 20mm HS.404 cannon on centerline forward and centerline aft
- 2 x 12.7mm Hotchkiss MGs side amidships
- 2 racks for six depth charges or four naval mines
Boats in class: PL-1, PL-2, PL-3, PL-4
Quantity: France (8), Syria (4), Indochina (Patrouille Navale) (4)

6

Tuesday, July 9th 2013, 10:32pm

CSM-81 Class, French Subchaser laid down 1933
Fifty of these craft were transferred from the Marine Nationale in September 1943.

Displacement:
100 t light; 106 t standard; 116 t normal; 124 t full load

Dimensions: Length overall / water x beam x draught
108.27 ft / 108.27 ft x 17.72 ft x 4.92 ft (normal load)
33.00 m / 33.00 m x 5.40 m x 1.50 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1933 Model
Dual purpose gun in deck mount
on centreline forward
2 - 1.57" / 40.0 mm guns (1x2 guns), 1.95lbs / 0.89kg shells, 1933 Model
Anti-aircraft guns in deck mount
on centreline aft
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1933 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 18 lbs / 8 kg
Shells per gun, main battery: 350

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 896 shp / 669 Kw = 18.00 kts
Range 1,800nm at 12.00 kts
Bunker at max displacement = 17 tons

Complement:
16 - 22

Cost:
£0.043 million / $0.171 million

Distribution of weights at normal displacement:
Armament: 2 tons, 1.9 %
Armour: 1 tons, 1.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 26 tons, 22.5 %
Hull, fittings & equipment: 59 tons, 51.3 %
Fuel, ammunition & stores: 16 tons, 13.8 %
Miscellaneous weights: 11 tons, 9.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
217 lbs / 99 Kg = 16.9 x 3.0 " / 75 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.4 ft / 0.1 m
Roll period: 11.1 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.16
Seaboat quality (Average = 1.00): 1.25

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.430
Length to Beam Ratio: 6.11 : 1
'Natural speed' for length: 12.54 kts
Power going to wave formation at top speed: 71 %
Trim (Max stability = 0, Max steadiness = 100): 41
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11.48 ft / 3.50 m
- Forecastle (20 %): 9.84 ft / 3.00 m
- Mid (50 %): 8.20 ft / 2.50 m
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 8.91 ft / 2.72 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 100.9 %
- Above water (accommodation/working, high = better): 127.8 %
Waterplane Area: 1,251 Square feet or 116 Square metres
Displacement factor (Displacement / loading): 141 %
Structure weight / hull surface area: 23 lbs/sq ft or 110 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.76
- Longitudinal: 12.53
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weights:
- 2 tons for ASDIC
- 9 tons for depth charge

Ships in Class:
- Kon Tum (ex-CSM-100): Built in Saigon Q2/1933, transferred to Patrouille Navale Indochinoise, 1943
- Phu Tho (ex-CSM-101): Built in Saigon Q3/1933, transferred to Patrouille Navale Indochinoise, 1943
- Tra Vinh (ex-CSM-102): Built in Saigon Q3/1933, transferred to Patrouille Navale Indochinoise, 1943
- Tien Giang (ex-CSM-103): Built in Saigon Q3/1933, transferred to Patrouille Navale Indochinoise, 1943
- Quang Binh (ex-CSM-104): Built in Saigon Q3/1933, transferred to Patrouille Navale Indochinoise, 1943
- Dong Nai (ex-CSM-105): Built in Saigon Q3/1933, transferred to Patrouille Navale Indochinoise, 1943
- Dien Bien (ex-CSM-106): Built in Saigon Q3/1933, transferred to Patrouille Navale Indochinoise, 1943
- Ha Giang (ex-CSM-107): Built in Saigon Q3/1933, transferred to Patrouille Navale Indochinoise, 1943
- Lai Chau (ex-CSM-108): Built in Saigon Q3/1933, transferred to Patrouille Navale Indochinoise, 1943
- Binh Duong (ex-CSM-109): Built in Saigon Q3/1933, transferred to Patrouille Navale Indochinoise, 1943
- Son La (ex-CSM-110): Built in Saigon Q3/1933, transferred to Patrouille Navale Indochinoise, 1943
- Soc Trang (ex-CSM-111): Built in Saigon Q4/1933, transferred to Patrouille Navale Indochinoise, 1943
- Vinh Phuc (ex-CSM-112): Built in Saigon Q4/1933, transferred to Patrouille Navale Indochinoise, 1943
- Cao Bang (ex-CSM-113): Built in Saigon Q4/1933, transferred to Patrouille Navale Indochinoise, 1943
- Nam Dinh (ex-CSM-114): Built in Saigon Q4/1933, transferred to Patrouille Navale Indochinoise, 1943
- Ha Tinh (ex-CSM-115): Built in Saigon Q4/1933, transferred to Patrouille Navale Indochinoise, 1943
- Ben Tre (ex-CSM-116): Built in Saigon Q4/1933, transferred to Patrouille Navale Indochinoise, 1943
- Vinh Long (ex-CSM-117): Built in Saigon Q4/1933, transferred to Patrouille Navale Indochinoise, 1943
- Thai Binh (ex-CSM-118): Built in Saigon Q4/1933, transferred to Patrouille Navale Indochinoise, 1943
- Dong Thap (ex-CSM-119): Built in Saigon Q4/1933, transferred to Patrouille Navale Indochinoise, 1943
- An Giang (ex-CSM-120): Built in Saigon Q4/1933, transferred to Patrouille Navale Indochinoise, 1943
- Quang Tri (ex-CSM-121): Built in Saigon Q1/1934, transferred to Patrouille Navale Indochinoise, 1943
- Kien Giang (ex-CSM-122): Built in Saigon Q1/1934, transferred to Patrouille Navale Indochinoise, 1943
- Ba Ria-Vung Tau (ex-CSM-123): Built in Saigon Q1/1934, transferred to Patrouille Navale Indochinoise, 1943
- Gia Lai (ex-CSM-124): Built in Saigon Q1/1934, transferred to Patrouille Navale Indochinoise, 1943
- Yen Bai (ex-CSM-125): Built in Saigon Q1/1934, transferred to Patrouille Navale Indochinoise, 1943
- Hau Giang (ex-CSM-126): Built in Saigon Q1/1934, transferred to Patrouille Navale Indochinoise, 1943
- Binh Dinh (ex-CSM-127): Built in Saigon Q1/1934, transferred to Patrouille Navale Indochinoise, 1943
- Hoa Binh (ex-CSM-128): Built in Saigon Q1/1934, transferred to Patrouille Navale Indochinoise, 1943
- Ninh Binh (ex-CSM-129): Built in Saigon Q1/1934, transferred to Patrouille Navale Indochinoise, 1943
- Hung Yen (ex-CSM-130): Built in Saigon Q1/1934, transferred to Patrouille Navale Indochinoise, 1943
- Thai Nguyen (ex-CSM-131): Built in Saigon Q2/1934, transferred to Patrouille Navale Indochinoise, 1943
- Tay Ninh (ex-CSM-132): Built in Saigon Q2/1934, transferred to Patrouille Navale Indochinoise, 1943
- Nghe An (ex-CSM-133): Built in Saigon Q2/1934, transferred to Patrouille Navale Indochinoise, 1943
- Binh Phuoc (ex-CSM-134): Built in Saigon Q2/1934, transferred to Patrouille Navale Indochinoise, 1943
- Bac Lieu (ex-CSM-135): Built in Saigon Q2/1934, transferred to Patrouille Navale Indochinoise, 1943
- Lam Dong (ex-CSM-136): Built in Saigon Q2/1934, transferred to Patrouille Navale Indochinoise, 1943
- Quang Ninh (ex-CSM-137): Built in Saigon Q2/1934, transferred to Patrouille Navale Indochinoise, 1943
- Dak Lak (ex-CSM-138): Built in Saigon Q2/1934, transferred to Patrouille Navale Indochinoise, 1943
- Hain Duong (ex-CSM-139): Built in Saigon Q2/1934, transferred to Patrouille Navale Indochinoise, 1943
- Dak Nong (ex-CSM-140): Built in Saigon Q2/1934, transferred to Patrouille Navale Indochinoise, 1943
- Bac Ninh (ex-CSM-141): Built in Saigon Q3/1934, transferred to Patrouille Navale Indochinoise, 1943
- Ca Mau (ex-CSM-142): Built in Saigon Q3/1934, transferred to Patrouille Navale Indochinoise, 1943
- Bac Kan (ex-CSM-143): Built in Saigon Q3/1934, transferred to Patrouille Navale Indochinoise, 1943
- Phu Yen (ex-CSM-144): Built in Saigon Q3/1934, transferred to Patrouille Navale Indochinoise, 1943
- Long An (ex-CSM-145): Built in Saigon Q3/1934, transferred to Patrouille Navale Indochinoise, 1943
- Lao Cai (ex-CSM-146): Built in Saigon Q3/1934, transferred to Patrouille Navale Indochinoise, 1943
- Tuyen Quang (ex-CSM-147): Built in Saigon Q3/1934, transferred to Patrouille Navale Indochinoise, 1943
- Thanh Hoa (ex-CSM-148): Built in Saigon Q3/1934, transferred to Patrouille Navale Indochinoise, 1943
- Quang Nam (ex-CSM-149): Built in Saigon Q3/1934, transferred to Patrouille Navale Indochinoise, 1943

7

Monday, February 17th 2014, 2:44am

HQ-01 Class Motor Minesweeper
Raumboot-37 Type motor minesweepers, purchased in 1944 from Germany. Specs are as refitted in Q4/1944 (replacement of German 3.7cm and 2cm guns with French 40mm and 23mm guns, addition of DRBV-6C DEM).

Dimensions:
- Length (Total): 37.8 m
- Length (Waterline): 36.2m
- Beam: 5.75 m
- Draft: 1.6m
- Displacement: 92t light; 125t max
Crew: 28-44
Weapons
- 1 x 40mm/L60 cannon
- 1 x 23mm MG
- 2 x 15mm machine guns
- Up to 4 mines
Engines: 2x MAN 8-cyl diesel engines, 2 shafts, 1800shp each
Speed: 19.5 kts
Range: 1300 miles at 15 kn

Names: HQ-01, HQ-02, HQ-03, HQ-04, HQ-05, HQ-06, HQ-07, HQ-08, HQ-09, HQ-10, HQ-11, HQ-12, HQ-12, HQ-14, HQ-15, HQ-16

8

Monday, October 16th 2017, 10:22pm

I apparently neglected to post this design to its proper place, and had to hunt the stupid thing down and find it. Oops.

*****


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

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 light ASW rockets (Mousetrap equivalent)

Ships in Class:
- Cam Ranh: Built Q1/1944.
- Da Nang: Built Q1/1944.
- Thi Nai: Built Q2/1944.
- Vung Tau: Built Q3/1944.
- Qhi Nhon: Built Q4/1945.
- Nha Trang: Built Q1/1946.
- My Tho: Built Q2/1946.
- Can Tho: Built Q3/1946.