WesWorld

Survey Vessels
Pourqoi Pas? class Survey Ship - 1937
- Pourqoi Pas?
- Le Suroit

Ingénieur Elie Monnier class Hydrographic Aviso - 1943
- Ingénieur Elie Monnier - 1943

Géographe class Survey Ship - 1943
- Géographe - 1944
- Naturaliste - 1944

Research Submarines
CNRS-1 class Research Submarine - 1943
- CNRS-1

Pourqoi Pas? and Le Suroit, French Oceanic Research Vessel laid down 1937

Displacement:
590 t light; 605 t standard; 749 t normal; 864 t full load

Dimensions: Length overall / water x beam x draught
252.34 ft / 246.06 ft x 29.53 ft x 8.20 ft (normal load)
76.91 m / 75.00 m x 9.00 m x 2.50 m

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2,116 shp / 1,578 Kw = 18.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 259 tons

Complement:
71 - 93

Cost:
£0.158 million / $0.630 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 59 tons, 7.8 %
Hull, fittings & equipment: 382 tons, 51.0 %
Fuel, ammunition & stores: 159 tons, 21.2 %
Miscellaneous weights: 150 tons, 20.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,481 lbs / 1,125 Kg = 23.0 x 6 " / 152 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.2 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
and transom stern
Block coefficient: 0.440
Length to Beam Ratio: 8.33 : 1
'Natural speed' for length: 18.32 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 35
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: 17.26 ft / 5.26 m
- Forecastle (20 %): 10.99 ft / 3.35 m
- Mid (50 %): 10.99 ft / 3.35 m
- Quarterdeck (15 %): 10.99 ft / 3.35 m
- Stern: 10.99 ft / 3.35 m
- Average freeboard: 11.49 ft / 3.50 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 48.4 %
- Above water (accommodation/working, high = better): 140.8 %
Waterplane Area: 4,775 Square feet or 444 Square metres
Displacement factor (Displacement / loading): 280 %
Structure weight / hull surface area: 48 lbs/sq ft or 232 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.16
- Longitudinal: 3.34
- Overall: 1.29
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, rides out heavy weather easily

Ships in Class:
- Pourqoi Pas?
- Le Suroit

Notes:
These ships are manned by civilian crews and are employed in conducting hydrographic research and maritime surveying.

CNRS-1, French Bathyscaphe
This bathyscaphe was designed by Swiss scientist Auguste Piccard, with work starting in 1937. Funding from the French Centre national de la recherche scientifique (CNRS) allowed Piccard to build this research submarine, which would be operated jointly by the CNRS and the French Navy.

Type: Deep-submergence vehicle
Length: 6.9 m (23 ft)
Beam: 3.2 m (10 ft)
Draft: 6 m (20 ft)
Installed power: 1kW electric motor
Speed: 0.5kn
Endurance: 24h
Test depth: 4,000 m (13,000 ft)
Complement: 2

Ingénieur Elie Monnier, French Hydrographic Ship laid down 1943

Displacement:
200 t light; 205 t standard; 264 t normal; 311 t full load

Dimensions: Length overall / water x beam x draught
113.98 ft / 111.55 ft x 22.97 ft x 6.56 ft (normal load)
34.74 m / 34.00 m x 7.00 m x 2.00 m

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 383 shp / 286 Kw = 12.00 kts
Range 6,000nm at 12.00 kts
Bunker at max displacement = 106 tons

Complement:
32 - 42

Cost:
£0.055 million / $0.219 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 10 tons, 3.7 %
Hull, fittings & equipment: 115 tons, 43.5 %
Fuel, ammunition & stores: 64 tons, 24.3 %
Miscellaneous weights: 75 tons, 28.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
699 lbs / 317 Kg = 6.5 x 6 " / 152 mm shells or 0.9 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.7 ft / 0.2 m
Roll period: 11.8 seconds
Steadiness - As gun platform (Average = 50 %): 61 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.50

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.550
Length to Beam Ratio: 4.86 : 1
'Natural speed' for length: 10.56 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 41
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13.78 ft / 4.20 m
- Forecastle (20 %): 10.66 ft / 3.25 m (6.56 ft / 2.00 m aft of break)
- Mid (50 %): 6.56 ft / 2.00 m
- Quarterdeck (15 %): 6.56 ft / 2.00 m
- Stern: 6.56 ft / 2.00 m
- Average freeboard: 7.63 ft / 2.33 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 44.3 %
- Above water (accommodation/working, high = better): 67.7 %
Waterplane Area: 1,734 Square feet or 161 Square metres
Displacement factor (Displacement / loading): 279 %
Structure weight / hull surface area: 42 lbs/sq ft or 206 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.44
- Longitudinal: 5.99
- Overall: 1.66
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Good seaboat, rides out heavy weather easily

Notes:
Light hydrographic ship. Can be used for maritime surveying, tending research craft, and sonar testing. This ships is manned by a predominantly civilian crew with French Navy officers.

Breakdown of Miscellaneous Weights:
- 2 tons for DRBN-1 navigational surface and air search radar
- 8 tons for high test crane and winch
- 65 tons for cargo, passengers, and gear

Ships in Class:
- Ingénieur Elie Monnier

Géographe class, French Survey Ship laid down 1940

Displacement:
3,225 t light; 3,401 t standard; 6,937 t normal; 9,766 t full load

Dimensions: Length overall / water x beam x draught
355.10 ft / 344.49 ft x 50.85 ft x 21.33 ft (normal load)
108.23 m / 105.00 m x 15.50 m x 6.50 m

Armament:
8 - 1.57" / 40.0 mm guns (4x2 guns), 1.95lbs / 0.88kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Aft Main mounts separated by engine room
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Machine guns in deck mounts
on side, all amidships
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 3,750

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 2,081 shp / 1,552 Kw = 12.00 kts
Range 65,300nm at 12.00 kts
Bunker at max displacement = 6,365 tons

Complement:
379 - 494

Cost:
£0.734 million / $2.938 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.0 %
Machinery: 56 tons, 0.8 %
Hull, fittings & equipment: 1,392 tons, 20.1 %
Fuel, ammunition & stores: 3,712 tons, 53.5 %
Miscellaneous weights: 1,775 tons, 25.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
19,860 lbs / 9,008 Kg = 10,170.3 x 1.6 " / 40 mm shells or 4.6 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 2.5 ft / 0.8 m
Roll period: 13.4 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 raised forecastle, raised quarterdeck
Block coefficient: 0.650
Length to Beam Ratio: 6.77 : 1
'Natural speed' for length: 18.56 kts
Power going to wave formation at top speed: 29 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22.97 ft / 7.00 m
- Forecastle (22 %): 19.69 ft / 6.00 m (13.12 ft / 4.00 m aft of break)
- Mid (50 %): 13.12 ft / 4.00 m
- Quarterdeck (25 %): 19.69 ft / 6.00 m (13.12 ft / 4.00 m before break)
- Stern: 19.69 ft / 6.00 m
- Average freeboard: 16.50 ft / 5.03 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 32.7 %
- Above water (accommodation/working, high = better): 87.3 %
Waterplane Area: 13,231 Square feet or 1,229 Square metres
Displacement factor (Displacement / loading): 365 %
Structure weight / hull surface area: 64 lbs/sq ft or 314 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.06
- Overall: 1.00
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, can fire her guns in the heaviest weather

Notes:
Range is actually 12,500nm at 12.00 kts
Bunker at max displacement is actually 1,269 tons
5097 tons of cargo simmed as bunker fuel.

These vessels are largely identical to the Élara-class dry cargo ships operated by the French Navy. Armament is not installed in peacetime; may be bolted to the deck during wartime.

Ships in Class:
- Géographe
- Naturaliste