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1

Friday, March 6th 2015, 4:19am

Cambodian Navy, 1946

As discussed here...

Quoted

The current naval plan for Cambodia appears as follows:
---- Four 160t "sea trucks", named Kampot, Ratanakiri, Ta Khmao, and Serei Saophoan, shall be built in the local drydock at a rate of one per quarter. These vessels are wooden hulled and shall serve as unarmed (or meagerly armed) coastal transports and tenders.
---- Four 160t torpedo boats of the La Combattante II class shall be ordered from France, with two boats ordered in Q3/46, and two more in Q4/46. These boats shall be named Battambang, Koh Kong, Preah Sihanouk, and Kampong Speu. Delivery shall likely occur sometime in 1947. These boats shall be used for coastal patrol and coastal defense.
---- Sixteen fast riverine patrol craft, of ten tons each, will be delivered from Q1 onward at a rate of four per quarter.
---- 560 tons remain unspoken-for at present. Among the ideas I have in mind are a set of very small coastal or harbour minesweepers, a port tug, or a small group of MTB-sized coastal gunboats.


The Cambodian Navy will establish their main base at Ream, near Sihanoukville.

2

Friday, March 6th 2015, 4:31am

Kampot-class, Cambodian Sea Truck laid down 1946
This design is a classic example of the Asian-built "Sea Truck": designed to be easily and cheaply manufactured and maintained in all manner of primitive conditions. The Cambodian Navy will employ the craft for training, transport of men and materiel, and virtually every other task under the sun.

Displacement:
160 t light; 166 t standard; 318 t normal; 439 t full load

Dimensions: Length overall / water x beam x draught
103.85 ft / 98.43 ft x 21.00 ft x 9.84 ft (normal load)
31.65 m / 30.00 m x 6.40 m x 3.00 m

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Direct drive, 1 shaft, 216 ihp / 161 Kw = 10.00 kts
Range 18,500nm at 10.00 kts
Bunker at max displacement = 273 tons

Complement:
36 - 48

Cost:
£0.051 million / $0.205 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 12 tons, 3.7 %
Hull, fittings & equipment: 87 tons, 27.5 %
Fuel, ammunition & stores: 158 tons, 49.6 %
Miscellaneous weights: 61 tons, 19.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,123 lbs / 510 Kg = 10.4 x 6 " / 152 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 0.6 ft / 0.2 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.547
Length to Beam Ratio: 4.69 : 1
'Natural speed' for length: 9.92 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13.78 ft / 4.20 m
- Forecastle (20 %): 11.81 ft / 3.60 m
- Mid (50 %): 9.84 ft / 3.00 m
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 10.83 ft / 3.30 m
- Average freeboard: 10.76 ft / 3.28 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 34.3 %
- Above water (accommodation/working, high = better): 76.0 %
Waterplane Area: 1,394 Square feet or 130 Square metres
Displacement factor (Displacement / loading): 377 %
Structure weight / hull surface area: 26 lbs/sq ft or 129 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.76
- Longitudinal: 16.80
- Overall: 1.04
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, rides out heavy weather easily

Ships in Class:
- Kampot
- Ratanakiri
- Ta Khmao
- Serei Saophoan

3

Friday, March 6th 2015, 4:34am

Battambang (La Combattante II)-class Patrol Torpedo Vessel
Displacement: 160 tonnes (light), 175 tonnes (normal)
Length: 42.5 m (- ft) overall
Beam: 6.8 m (- ft)
Draught: 2.1 m (- ft) full load
Machinery: 4 Alsthom-SACM MD.12/135 marine diesel engines, all of 3,000hp
Speed: 19 knots (cruising); 38 knots (sprint speed)
Cruising range: 650nm at 31 knots
Crew: 33 men
Armament:
- 2 x 40mm AA guns (one forward, one aft) in enclosed mounts
- 2 x 15mm Hotchkiss machine guns amidships
- 4 x 550mm torpedoes
- 2 racks for four depth charges or naval mines
Ships in Class: Battambang, Koh Kong, Preah Sihanouk, and Kampong Speu

Notes: Export-built version of the French La Combattante II torpedo boats. The largest difference is the use of 15mm Hotchkiss machine guns instead of 20mm or 23mm cannon. These vessels are envisioned as the primary surface combatants of the Cambodian Navy.

4

Friday, March 6th 2015, 4:43am

River Patrol Boat 101-class, 12.2m (12.2m River Utility Boat)
Displacement: 10 tonnes
Length: 12.2 m (40 ft) overall
Beam: 3.5 m (11.5 ft)
Draught: 1 m (3.25 ft) full load
Machinery: 1 V6 diesel engine, 225cv, driving one shaft
Speed: 12 knots
Range: 338km (210 miles)
Crew: 5 men
Armament:
- 1 x 15mm machine gun[/quote]
Ships in Class: 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116

5

Friday, March 6th 2015, 4:49am

And now, some proposals at how to spend the remaining 560 tons...

First, there's a 30-ton coastal minesweeper of French design. The French have acquired a few of these for use as minesweeping and patrol boats in harbors. They are also among the craft that the Polynesie class avisos are designed to serve as motherships for. These would most likely be built in Indochina for Cambodian purchase.

Quoted

Dragueur de mines 17.4m-class Light Minesweeper
Displacement: 30 tonnes (light), 38 tonnes (normal)
Length: 17.4 m (57 ft) overall
Beam: 4.9 m (16 ft)
Draught: 1.3 m (4.33 ft) full load
Machinery: 2 Renault marine diesel engines, both of 342hp; two shafts
Speed: 12 knots (full load)
Cruising range: 380nm at 12 knots
Crew: 6 men
Armament:
- 1 x 15mm machine gun


And second of all comes a proper Springsharp design for a small (very small!) harbour tug. Since the Cambodian Navy's largest vessels are the chunky-monkey 300t displacement Sea Trucks, they really don't need anything all that spectacular. The ship would probably double as a buoy tender, netlayer, port guard...

Quoted

Ta Khmao, Cambodian Harbour Tug laid down 1946

Displacement:
85 t light; 89 t standard; 100 t normal; 109 t full load

Dimensions: Length overall / water x beam x draught
90.22 ft / 90.22 ft x 18.04 ft x 4.92 ft (normal load)
27.50 m / 27.50 m x 5.50 m x 1.50 m

Armament:
1 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1946 Model
Anti-aircraft gun in deck mount
on centreline forward, 1 raised gun
2 - 0.59" / 15.0 mm guns (1x2 guns), 0.10lbs / 0.05kg shells, 1946 Model
Machine guns in deck mount
on centreline aft, all raised guns - superfiring
Weight of broadside 2 lbs / 1 kg
Shells per gun, main battery: 1,500

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.79" / 20 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 423 shp / 316 Kw = 15.00 kts
Range 2,500nm at 12.00 kts
Bunker at max displacement = 20 tons

Complement:
15 - 20

Cost:
£0.033 million / $0.133 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.3 %
Armour: 1 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 11 tons, 10.6 %
Hull, fittings & equipment: 61 tons, 61.4 %
Fuel, ammunition & stores: 15 tons, 15.2 %
Miscellaneous weights: 12 tons, 12.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
348 lbs / 158 Kg = 178.0 x 1.6 " / 40 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.4 ft / 0.1 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 1.47

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.437
Length to Beam Ratio: 5.00 : 1
'Natural speed' for length: 11.69 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 35
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: 12.00 ft / 3.66 m
- Forecastle (20 %): 10.00 ft / 3.05 m
- Mid (50 %): 8.00 ft / 2.44 m
- Quarterdeck (15 %): 8.00 ft / 2.44 m
- Stern: 8.00 ft / 2.44 m
- Average freeboard: 8.86 ft / 2.70 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 52.7 %
- Above water (accommodation/working, high = better): 114.7 %
Waterplane Area: 1,067 Square feet or 99 Square metres
Displacement factor (Displacement / loading): 279 %
Structure weight / hull surface area: 28 lbs/sq ft or 137 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 20.62
- Overall: 1.38
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily

6

Friday, March 6th 2015, 5:12am

A last one - basically a submarine chaser in the form of a patrol boat. Less of a brawler than the Battambang class, but likely easier to maintain!

If I built four Sea Trucks, four Battambangs, sixteen 101s, the singular tug Ta Khmao, four of the 30t light minesweepers, and two of these vessels, that runs the bill up to 1,855 tons out of the 2,000 tons I'd identified at project start. That's a whopping 145 tons remaining for... uh... Wikipedia says the Cambodian Navy has a whole lot of motor canoes...?

Quoted

Phnom Aural, Cambodian Patrol Vessel laid down 1946

Displacement:
105 t light; 111 t standard; 123 t normal; 134 t full load

Dimensions: Length overall / water x beam x draught
114.24 ft / 109.91 ft x 18.04 ft x 5.25 ft (normal load)
34.82 m / 33.50 m x 5.50 m x 1.60 m

Armament:
2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1946 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread
2 - 0.59" / 15.0 mm guns in single mounts, 0.10lbs / 0.05kg shells, 1946 Model
Machine guns in deck mounts
on centreline, all aft
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 1,500

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm - -

- Conning tower: 0.59" / 15 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,172 shp / 875 Kw = 18.00 kts
Range 1,150nm at 15.00 kts
Bunker at max displacement = 23 tons

Complement:
18 - 24

Cost:
£0.058 million / $0.232 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.4 %
Armour: 2 tons, 1.2 %
- 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, 0.3 %
Machinery: 29 tons, 23.7 %
Hull, fittings & equipment: 55 tons, 44.7 %
Fuel, ammunition & stores: 19 tons, 15.3 %
Miscellaneous weights: 18 tons, 14.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
205 lbs / 93 Kg = 104.9 x 1.6 " / 40 mm shells or 0.3 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 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 1.04

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.415
Length to Beam Ratio: 6.09 : 1
'Natural speed' for length: 10.48 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 48
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: 11.90 ft / 3.63 m
- Forecastle (20 %): 7.51 ft / 2.29 m
- Mid (50 %): 7.51 ft / 2.29 m
- Quarterdeck (15 %): 7.51 ft / 2.29 m
- Stern: 7.51 ft / 2.29 m
- Average freeboard: 7.86 ft / 2.40 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 99.4 %
- Above water (accommodation/working, high = better): 97.9 %
Waterplane Area: 1,232 Square feet or 114 Square metres
Displacement factor (Displacement / loading): 150 %
Structure weight / hull surface area: 23 lbs/sq ft or 114 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 7.58
- Overall: 1.03
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate

- Phnom Aural
- Phnom Samkos