WesWorld

De Grasse-class Minelaying-Cruisers

De Grasse
Dupleix
Edgard Quinet
Waldeck Rousseau

De Grasse-class, French CL rebuilt as Minelayer Cruiser laid down 1919 (Engine 1940)

Displacement:
7,609 t light; 7,940 t standard; 8,869 t normal; 9,612 t full load

Dimensions: Length overall / water x beam x draught
572.90 ft / 551.18 ft x 55.77 ft x 22.97 ft (normal load)
174.62 m / 168.00 m x 17.00 m x 7.00 m

Armament:
8 - 5.43" / 138 mm guns (4x2 guns), 80.19lbs / 36.37kg shells, 1940 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 3.54" / 90.0 mm guns (4x2 guns), 22.24lbs / 10.09kg shells, 1940 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all amidships
16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.88kg shells, 1940 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 851 lbs / 386 kg
Shells per gun, main battery: 300

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.54" / 90 mm 380.58 ft / 116.00 m 8.96 ft / 2.73 m
Ends: Unarmoured
Main Belt covers 106 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.72" / 120 mm 1.18" / 30 mm 2.36" / 60 mm
2nd: 0.79" / 20 mm - -

- Armour deck: 1.97" / 50 mm, Conning tower: 4.72" / 120 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 89,198 shp / 66,541 Kw = 33.00 kts
Range 8,500nm at 15.00 kts
Bunker at max displacement = 1,673 tons

Complement:
456 - 594

Cost:
£1.542 million / $6.168 million

Distribution of weights at normal displacement:
Armament: 127 tons, 1.4 %
Armour: 1,331 tons, 15.0 %
- Belts: 497 tons, 5.6 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 82 tons, 0.9 %
- Armour Deck: 708 tons, 8.0 %
- Conning Tower: 44 tons, 0.5 %
Machinery: 2,385 tons, 26.9 %
Hull, fittings & equipment: 3,216 tons, 36.3 %
Fuel, ammunition & stores: 1,260 tons, 14.2 %
Miscellaneous weights: 550 tons, 6.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
8,680 lbs / 3,937 Kg = 108.2 x 5.4 " / 138 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 2.5 ft / 0.8 m
Roll period: 14.8 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.28
Seaboat quality (Average = 1.00): 1.05

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.440
Length to Beam Ratio: 9.88 : 1
'Natural speed' for length: 23.48 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 57
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.25 ft / 8.00 m
- Forecastle (20 %): 21.33 ft / 6.50 m
- Mid (50 %): 16.40 ft / 5.00 m
- Quarterdeck (15 %): 16.40 ft / 5.00 m
- Stern: 19.69 ft / 6.00 m
- Average freeboard: 18.77 ft / 5.72 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 106.1 %
- Above water (accommodation/working, high = better): 142.5 %
Waterplane Area: 19,448 Square feet or 1,807 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 96 lbs/sq ft or 467 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.68
- Overall: 1.03
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

450 tons of naval mines on rails
100 tons radar etc.

3804 tons apiece to rebuild as Minelayers.