F/CA/1917 Fast, France Armoured Cruiser laid down 1917 (Engine 1937)
Displacement:
16,817 t light; 17,602 t standard; 18,643 t normal; 19,477 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(751.80 ft / 742.00 ft) x 71.00 ft x (22.00 / 22.78 ft)
(229.15 m / 226.16 m) x 21.64 m x (6.71 / 6.94 m)
Armament:
8 - 9.40" / 239 mm 55.0 cal guns - 449.00lbs / 203.66kg shells, 150 per gun
Breech loading guns in turret on barbette mounts, 1917 Model
2 x Quad mounts on centreline, forward deck forward
1 raised mount - superfiring
12 - 5.50" / 140 mm 55.0 cal guns - 90.00lbs / 40.82kg shells, 150 per gun
Quick firing guns in turret on barbette mounts, 1917 Model
4 x Triple mounts on sides, aft deck forward
8 - 3.40" / 86.4 mm 50.0 cal guns - 20.80lbs / 9.43kg shells, 150 per gun
Anti-air guns in deck and hoist mounts, 1917 Model
4 x Twin mounts on sides, aft deck aft
4 raised mounts
Weight of broadside 4,838 lbs / 2,195 kg
6 - 21.3" / 540 mm, 22.00 ft / 6.71 m torpedoes - 1.440 t each, 8.642 t total
In 2 sets of deck mounted carriage/fixed tubes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 5.00" / 127 mm 480.00 ft / 146.30 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 100 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.00" / 25 mm 480.00 ft / 146.30 m 22.00 ft / 6.71 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.00" / 102 mm 3.00" / 76 mm 4.00" / 102 mm
2nd: 3.00" / 76 mm 3.00" / 76 mm 3.00" / 76 mm
- Box over magazines: 3.00" / 76 mm
- Conning towers: Forward 6.00" / 152 mm, Aft 0.00" / 0 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 186,710 shp / 139,286 Kw = 36.00 kts
Range 5,600nm at 15.00 kts
Bunker at max displacement = 1,875 tons
Complement:
797 - 1,037
Cost:
£3.393 million / $13.573 million
Distribution of weights at normal displacement:
Armament: 1,328 tons, 7.1 %
- Guns: 1,320 tons, 7.1 %
- Torpedoes: 9 tons, 0.0 %
Armour: 2,452 tons, 13.2 %
- Belts: 1,179 tons, 6.3 %
- Torpedo bulkhead: 391 tons, 2.1 %
- Armament: 675 tons, 3.6 %
- Armour Deck: 117 tons, 0.6 %
- Conning Tower: 91 tons, 0.5 %
Machinery: 5,175 tons, 27.8 %
Hull, fittings & equipment: 7,862 tons, 42.2 %
Fuel, ammunition & stores: 1,826 tons, 9.8 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
17,081 lbs / 7,748 Kg = 41.1 x 9.4 " / 239 mm shells or 2.1 torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 3.4 ft / 1.0 m
Roll period: 16.2 seconds
Steadiness - As gun platform (Average = 50 %): 54 %
- Recoil effect (Restricted arc if above 1.00): 0.85
Seaboat quality (Average = 1.00): 1.09
Hull form characteristics:
Hull has rise forward of midbreak,
an extended bulbous bow and a cruiser stern
Block coefficient (normal/deep): 0.563 / 0.568
Length to Beam Ratio: 10.45 : 1
'Natural speed' for length: 27.24 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 12.00 degrees
Stern overhang: 3.00 ft / 0.91 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 27.00 %, 32.00 ft / 9.75 m, 28.00 ft / 8.53 m
- Forward deck: 36.00 %, 28.00 ft / 8.53 m, 28.00 ft / 8.53 m
- Aft deck: 21.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Quarter deck: 16.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Average freeboard: 25.47 ft / 7.76 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 163.0 %
- Above water (accommodation/working, high = better): 221.4 %
Waterplane Area: 37,217 Square feet or 3,458 Square metres
Displacement factor (Displacement / loading): 103 %
Structure weight / hull surface area: 141 lbs/sq ft or 689 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.43
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
This is a forum for discussion of topics relating to the Dreadnought era, prior to the ascendency of naval aviation. We will be discussing history, ship design, and naval wargaming.
Tuesday, July 03, 2007
A faster French armoured cruiser
I decided that I would see if I could achieve a higher speed for my French fast armoured cruiser design. I was able to reach 36 knots with the ship by changing the shape and reducing protection. This is the Springsharp report:
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