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