F/CA/1917 Long, France Armoured Cruiser laid down 1917 (Engine 1931)
Displacement:
19,625 t light; 20,379 t standard; 21,548 t normal; 22,484 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(732.05 ft / 729.00 ft) x 75.00 ft x (22.00 / 22.80 ft)
(223.13 m / 222.20 m) x 22.86 m x (6.71 / 6.95 m)
Armament:
8 - 9.40" / 239 mm 50.0 cal guns - 439.64lbs / 199.42kg shells, 150 per gun
Breech loading guns in turret on barbette mounts, 1917 Model
8 x Quad mounts on centreline, forward deck forward
1 raised mount - superfiring
8 - 4.00" / 102 mm 45.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
Quick firing guns in deck and hoist mounts, 1917 Model
4 x Twin mounts on sides, aft deck forward
Weight of broadside 3,773 lbs / 1,711 kg
6 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.409 t each, 8.455 t total
In 2 sets of deck mounted side rotating tubes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 8.00" / 203 mm 340.00 ft / 103.63 m 8.00 ft / 2.44 m
Ends: Unarmoured
Main Belt covers 72 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.00" / 25 mm 340.00 ft / 103.63 m 20.00 ft / 6.10 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 5.00" / 127 mm 8.00" / 203 mm
- Armoured deck - multiple decks: 4.00" / 102 mm For and Aft decks
Forecastle: 4.00" / 102 mm Quarter deck: 4.00" / 102 mm
- Conning towers: Forward 8.00" / 203 mm, Aft 0.00" / 0 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 170,128 shp / 126,916 Kw = 34.00 kts
Range 5,400nm at 15.00 kts
Bunker at max displacement = 2,105 tons
Complement:
889 - 1,156
Cost:
£3.254 million / $13.016 million
Distribution of weights at normal displacement:
Armament: 936 tons, 4.3 %
- Guns: 927 tons, 4.3 %
- Torpedoes: 8 tons, 0.0 %
Armour: 5,792 tons, 26.9 %
- Belts: 957 tons, 4.4 %
- Torpedo bulkhead: 252 tons, 1.2 %
- Armament: 1,394 tons, 6.5 %
- Armour Deck: 3,056 tons, 14.2 %
- Conning Tower: 133 tons, 0.6 %
Machinery: 5,088 tons, 23.6 %
Hull, fittings & equipment: 7,810 tons, 36.2 %
Fuel, ammunition & stores: 1,923 tons, 8.9 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
29,720 lbs / 13,481 Kg = 71.6 x 9.4 " / 239 mm shells or 3.2 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 3.9 ft / 1.2 m
Roll period: 16.0 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.58
Seaboat quality (Average = 1.00): 1.04
Hull form characteristics:
Hull has low quarterdeck ,
an extended bulbous bow and a cruiser stern
Block coefficient (normal/deep): 0.627 / 0.631
Length to Beam Ratio: 9.72 : 1
'Natural speed' for length: 27.00 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 6.00 degrees
Stern overhang: -2.00 ft / -0.61 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 20.00 %, 29.00 ft / 8.84 m, 28.00 ft / 8.53 m
- Forward deck: 30.00 %, 28.00 ft / 8.53 m, 27.00 ft / 8.23 m
- Aft deck: 23.00 %, 27.00 ft / 8.23 m, 27.00 ft / 8.23 m
- Quarter deck: 27.00 %, 19.00 ft / 5.79 m, 19.00 ft / 5.79 m
- Average freeboard: 25.27 ft / 7.70 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 127.8 %
- Above water (accommodation/working, high = better): 236.9 %
Waterplane Area: 41,006 Square feet or 3,810 Square metres
Displacement factor (Displacement / loading): 109 %
Structure weight / hull surface area: 133 lbs/sq ft or 647 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.16
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
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Sunday, October 28, 2007
The longer version of the F/CA/1917
The longer version of the F/CA/1917 is a much better design. The draft is still too shallow, even when I increased it to 22ft in this version. The hull form is too full for what the ship is. The original concept had a 4in deck and with the 729ft length, that was easily achieved, along with a 34 knot maximum speed. The armament is still 8-9.4in and 8-4in QF guns, with 6-21in TT. The belt is a thick 8in, although it is very narrow at 8ft tall. The design is really a modern version of the 1880's belted cruiser. This is the Springsharp report:
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