WesWorld

French mine warship, laid down 1922

Length, 70.0 m x Beam, 8.0 m x Depth, 2.5 m
565 tonnes normal displacement (503 tonnes standard)

Main battery: 3 x 7.5-cm
AA battery: 4 x 4.0-cm
Light battery: 4 x 1.3-cm
French Mine Warfare Ship, laid down 1922

Length, 70.0 m x Beam, 8.0 m x Depth, 2.6 m
589 tonnes normal displacement (496 tonnes standard)

Main battery: 1 x 7.5-cm
AA battery: 2 x 4.0-cm
Light battery: 2 x 1.3-cm

Weight of broadside: 8 kg

50 tons minesweeping equipment
100 tons mines

Hull unarmored

Battery armor:
Main, 2.5 cm shields
AA, 2.5 cm shields

Maximum speed for 2585 shaft kw = 20.50 knots
Approximate cruising radius, 6000 nm / 12 knots

Typical complement: 60-78


Estimated cost, $383,000 (£96,000)

Remarks:

Ship has slow, easy roll; a good, steady gun platform.

Good seaboat; rides out heavy weather easily.

Cramped ship; poor crew accommodation, limited working space.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 2 tonnes = 0 pct
Armor, total ..................... 1 tonnes = 0 pct

Armament 1 tonnes = 0 pct

Machinery ........................ 118 tonnes = 20 pct
Hull and fittings; equipment ..... 212 tonnes = 36 pct
Fuel, ammunition, stores ......... 106 tonnes = 18 pct
Miscellaneous weights ............ 150 tonnes = 25 pct
-----
589 tonnes = 100 pct

Estimated metacentric height, 0.2 m

Displacement summary:

Light ship: 483 tonnes
Standard displacement: 496 tonnes
Normal service: 589 tonnes
Full load: 661 tonnes

Loading submergence 303 tonnes/metre

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Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.01

Shellfire needed to sink: 331 kg = 56.5 x 7.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.5
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 70 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.04

Relative quality as a seaboat: 1.21

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Hull form characteristics:

Block coefficient: 0.40
Sharpness coefficient: 0.31
Hull speed coefficient 'M' = 8.37
'Natural speed' for length = 15.2 knots
Power going to wave formation
at top speed: 53 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 96 percent

Relative accommodation and working space: 89 percent


Displacement factor: 146 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.95
(Structure weight per square
metre of hull surface: 179 kg)

Relative longitudinal hull strength: 1.71
(for 2.62 m average freeboard)

Relative composite hull strength: 1.01

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[Machine-readable parameters: Spring Style v. 1.2.1]

229.60 x 26.24 x 8.66; 8.60 -- Dimensions
0.40 -- Block coefficient
1922 -- Year laid down
20.50 / 6000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
150 tons -- Miscellaneous weights
++++++++++
1 x 2.95; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
0 -- No secondary battery
2 x 1.57 -- Tertiary (QF/AA) battery
Gun-shields
:
2 x 0.51 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
0.98 / 0.00 / 0.98 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


+++++++++++++++++++++++++++++++++++++++++++++++++++++++


Faucon class, French Mine warfare vessel laid down 1925

Displacement:
569 t light; 585 t standard; 696 t normal; 785 t full load

Dimensions: Length overall / water x beam x draught
229.66 ft / 229.66 ft x 23.95 ft x 9.84 ft (normal load)
70.00 m / 70.00 m x 7.30 m x 3.00 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1925 Model
Breech loading gun in deck mount
on centreline forward
2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1925 Model
Breech loading guns in deck mounts
on side, all amidships
4 - 0.30" / 7.6 mm guns in single mounts, 0.01lbs / 0.01kg shells, 1925 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 200
50 tons mines
50 tons mineclearing equipment

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

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 10,243 shp / 7,641 Kw = 27.00 kts
Range 4,200nm at 15.00 kts (Bunkerage = 199 tons)

Complement:
67 - 88

Cost:
£0.208 million / $0.834 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.3 %
Armour: 3 tons, 0.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 300 tons, 43.1 %
Hull, fittings & equipment: 164 tons, 23.6 %
Fuel, ammunition & stores: 127 tons, 18.2 %
Miscellaneous weights: 100 tons, 14.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
239 lbs / 109 Kg = 18.6 x 3.0 " / 75 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 0.8 ft / 0.3 m
Roll period: 11.0 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 1.00

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.450
Length to Beam Ratio: 9.59 : 1
'Natural speed' for length: 17.46 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 13.12 ft / 4.00 m
- Forecastle (20 %): 13.12 ft / 4.00 m
- Mid (50 %): 13.12 ft / 4.00 m (9.02 ft / 2.75 m aft of break)
- Quarterdeck (15 %): 9.02 ft / 2.75 m
- Stern: 9.02 ft / 2.75 m
- Average freeboard: 11.07 ft / 3.38 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 157.3 %
- Above water (accommodation/working, high = better): 113.1 %
Waterplane Area: 3,645 Square feet or 339 Square metres
Displacement factor (Displacement / loading): 89 %
Structure weight / hull surface area: 22 lbs/sq ft or 106 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.42
- Overall: 0.59
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate

Eight to sixteen Flower-class minesweepers (aka Aubepine-class) will be laid down. These will replace the 1922 Noumea-class minesweepers.

Flower-class, French Minesweeper laid down 1940

Displacement:
578 t light; 602 t standard; 763 t normal; 891 t full load

Dimensions: Length overall / water x beam x draught
193.58 ft / 183.73 ft x 32.81 ft x 9.84 ft (normal load)
59.00 m / 56.00 m x 10.00 m x 3.00 m

Armament:
1 - 3.54" / 90.0 mm guns in single mounts, 22.24lbs / 10.09kg shells, 1940 Model
Dual purpose gun in deck mount
on centreline forward
4 - 1.57" / 40.0 mm guns (2x2 guns), 1.95lbs / 0.88kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 30 lbs / 14 kg
Shells per gun, main battery: 450

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2,025 shp / 1,511 Kw = 16.50 kts
Range 5,500nm at 15.00 kts
Bunker at max displacement = 289 tons

Complement:
72 - 94

Cost:
£0.186 million / $0.743 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.5 %
Machinery: 54 tons, 7.1 %
Hull, fittings & equipment: 370 tons, 48.5 %
Fuel, ammunition & stores: 185 tons, 24.2 %
Miscellaneous weights: 150 tons, 19.7 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,533 lbs / 1,149 Kg = 113.9 x 3.5 " / 90 mm shells or 1.4 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.1 ft / 0.3 m
Roll period: 13.0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.05
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.450
Length to Beam Ratio: 5.60 : 1
'Natural speed' for length: 13.55 kts
Power going to wave formation at top speed: 57 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.04 ft / 5.50 m
- Forecastle (20 %): 16.40 ft / 5.00 m
- Mid (50 %): 14.76 ft / 4.50 m
- Quarterdeck (15 %): 8.20 ft / 2.50 m (14.76 ft / 4.50 m before break)
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 14.48 ft / 4.42 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 50.3 %
- Above water (accommodation/working, high = better): 154.0 %
Waterplane Area: 3,845 Square feet or 357 Square metres
Displacement factor (Displacement / loading): 265 %
Structure weight / hull surface area: 50 lbs/sq ft or 243 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 10.30
- Overall: 1.26
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, can fire her guns in the heaviest weather

Here's the refit for the Faucon-class mine warfare ships. Their unusually high speed has been retained in the rebuild.

10 units in class

Faucon-class refit, French Minesweeper laid down 1925 (Engine 1940)

Displacement:
565 t light; 582 t standard; 696 t normal; 787 t full load

Dimensions: Length overall / water x beam x draught
229.66 ft / 229.66 ft x 23.95 ft x 9.84 ft (normal load)
70.00 m / 70.00 m x 7.30 m x 3.00 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1940 Model
Dual purpose gun in deck mount
on centreline forward
2 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships
4 - 0.30" / 7.6 mm guns in single mounts, 0.01lbs / 0.01kg shells, 1925 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 300

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

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 10,242 shp / 7,641 Kw = 27.00 kts
Range 5,000nm at 15.00 kts
Bunker at max displacement = 205 tons

Complement:
67 - 88

Cost:
£0.196 million / $0.784 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.3 %
Armour: 2 tons, 0.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 274 tons, 39.3 %
Hull, fittings & equipment: 187 tons, 26.9 %
Fuel, ammunition & stores: 131 tons, 18.8 %
Miscellaneous weights: 100 tons, 14.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
312 lbs / 141 Kg = 24.2 x 3.0 " / 75 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 0.8 ft / 0.2 m
Roll period: 11.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 0.99

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.450
Length to Beam Ratio: 9.59 : 1
'Natural speed' for length: 17.46 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 51
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: 13.12 ft / 4.00 m
- Forecastle (20 %): 13.12 ft / 4.00 m
- Mid (50 %): 13.12 ft / 4.00 m (9.02 ft / 2.75 m aft of break)
- Quarterdeck (15 %): 9.02 ft / 2.75 m
- Stern: 9.02 ft / 2.75 m
- Average freeboard: 11.07 ft / 3.38 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 145.5 %
- Above water (accommodation/working, high = better): 113.1 %
Waterplane Area: 3,644 Square feet or 339 Square metres
Displacement factor (Displacement / loading): 104 %
Structure weight / hull surface area: 25 lbs/sq ft or 120 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.57
- Longitudinal: 2.75
- Overall: 0.67
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather