Durance-class French Fleet Replenishment Ship laid down 1940
Displacement:
9,210 t light; 9,840 t standard; 28,926 t normal; 44,195 t full load
Dimensions: Length overall / water x beam x draught
629.11 ft / 614.99 ft x 83.01 ft x 31.99 ft (normal load)
191.75 m / 187.45 m x 25.30 m x 9.75 m
Armament:
2 - 2.95" / 75.0 mm guns (1x2 guns), 12.87lbs / 5.84kg shells, 1940 Model
Anti-aircraft guns in deck mount
on centreline forward
4 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 1.57" / 40.0 mm guns (2x4 guns), 1.95lbs / 0.89kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
2 - 0.91" / 23.0 mm guns in single mounts, 0.37lbs / 0.17kg shells, 1940 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 94 lbs / 42 kg
Shells per gun, main battery: 750
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 19,011 shp / 14,182 Kw = 18.00 kts
Range 58,000nm at 18.00 kts
Bunker at max displacement = 34,355 tons
Complement:
1,108 - 1,441
Cost:
£2.420 million / $9.681 million
Distribution of weights at normal displacement:
Armament: 12 tons, 0.0 %
Machinery: 508 tons, 1.8 %
Hull, fittings & equipment: 6,090 tons, 21.1 %
Fuel, ammunition & stores: 19,716 tons, 68.2 %
Miscellaneous weights: 2,600 tons, 9.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
183,781 lbs / 83,362 Kg = 14,277.4 x 3.0 " / 75 mm shells or 19.2 torpedoes
Stability (Unstable if below 1.00): 1.75
Metacentric height 9.4 ft / 2.9 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- 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: 0.620
Length to Beam Ratio: 7.41 : 1
'Natural speed' for length: 24.80 kts
Power going to wave formation at top speed: 34 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 9.00 ft / 2.74 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 29.00 ft / 8.84 m
- Forecastle (20 %): 26.00 ft / 7.92 m (19.00 ft / 5.79 m aft of break)
- Mid (50 %): 19.00 ft / 5.79 m
- Quarterdeck (15 %): 25.00 ft / 7.62 m (19.00 ft / 5.79 m before break)
- Stern: 26.00 ft / 7.92 m
- Average freeboard: 21.62 ft / 6.59 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 17.8 %
- Above water (accommodation/working, high = better): 124.2 %
Waterplane Area: 38,038 Square feet or 3,534 Square metres
Displacement factor (Displacement / loading): 780 %
Structure weight / hull surface area: 105 lbs/sq ft or 513 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.36
- Overall: 1.00
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
Breakdown of Miscellaneous Weights:
- 250 tons 120mm resupply ammunition (8,800 rounds @ 28kg per round)
- 300 tons 40mm resupply ammunition (288,000 rounds @ 1kg per round)
- 20 metric tons 12.7mm or 20mm resupply ammunition (600,000 rounds 12.7mm @ 0.03kg per round, or 180,000 rounds 20mm @ 0.11kg per round)
- 30 tons other ammunition
- 100 tons cranes and underway replenishment equipment
- 25 tons navigational/anti-collision radar
- 125 tons landing pad and two helicopters
- 1,800 tons consumable stores
Ships in Class:
-
Durance (1940)
-
Somme (1940)
-
Var (1941)
-
Oise (1941)
-
Rance (1942)
-
Loire (1942)