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Tuesday, October 30, 2007

The F/CA/1919 design with 11in guns

Perhaps for realism, the F/CA/1919 design should have 10.8in guns, but it has 11in guns, instead. Back in the early 1970's, having a version of the fast belted cruiser with 11in guns seemed like the next logical step. The secondary armament grew to 8-6in guns. The speed is now 35 knots, so it is a very potent design:
F/CA/1919, France Armoured Cruiser laid down 1919 (Engine 1933)

Displacement:
 22,380 t light; 23,144 t standard; 24,369 t normal; 25,350 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (733.50 ft / 729.00 ft) x 80.00 ft x (25.00 / 25.82 ft)
 (223.57 m / 222.20 m) x 24.38 m  x (7.62 / 7.87 m)

Armament:
      6 - 11.00" / 279 mm 45.0 cal guns - 670.00lbs / 303.91kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1919 Model
   2 x Triple mounts on centreline, forward deck forward
  1 raised mount - superfiring
      8 - 6.00" / 152 mm 45.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1919 Model
   4 x Twin mounts on sides, aft deck forward
      Weight of broadside 4,820 lbs / 2,186 kg
      6 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.417 t each, 8.503 t total
 In 2 sets of deck mounted side rotating tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 370.00 ft / 112.78 m 8.00 ft / 2.44 m
 Ends: Unarmoured
   Main Belt covers 78 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 370.00 ft / 112.78 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 7.00" / 178 mm  10.0" / 254 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 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, 204,178 shp / 152,317 Kw = 35.00 kts
 Range 5,400nm at 15.00 kts
 Bunker at max displacement = 2,206 tons

Complement:
 974 - 1,267

Cost:
 £4.527 million / $18.106 million

Distribution of weights at normal displacement:
 Armament: 927 tons, 3.8 %
    - Guns: 918 tons, 3.8 %
    - Torpedoes: 9 tons, 0.0 %
 Armour: 5,951 tons, 24.4 %
    - Belts: 1,032 tons, 4.2 %
    - Torpedo bulkhead: 342 tons, 1.4 %
    - Armament: 1,298 tons, 5.3 %
    - Armour Deck: 3,134 tons, 12.9 %
    - Conning Tower: 145 tons, 0.6 %
 Machinery: 5,949 tons, 24.4 %
 Hull, fittings & equipment: 9,554 tons, 39.2 %
 Fuel, ammunition & stores: 1,989 tons, 8.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   32,486 lbs / 14,735 Kg = 48.8 x 11.0 " / 279 mm shells or 3.5 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 4.4 ft / 1.3 m
 Roll period: 16.0 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.61
 Seaboat quality  (Average = 1.00): 1.07

Hull form characteristics:
 Hull has low quarterdeck ,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.585 / 0.589
 Length to Beam Ratio: 9.11 : 1
 'Natural speed' for length: 27.00 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 8.00 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 %,  32.00 ft / 9.75 m,  30.00 ft / 9.14 m
    - Forward deck: 30.00 %,  30.00 ft / 9.14 m,  29.00 ft / 8.84 m
    - Aft deck: 23.00 %,  29.00 ft / 8.84 m,  29.00 ft / 8.84 m
    - Quarter deck: 27.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
    - Average freeboard:  27.35 ft / 8.34 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 128.6 %
  - Above water (accommodation/working, high = better): 238.1 %
 Waterplane Area: 42,060 Square feet or 3,907 Square metres
 Displacement factor (Displacement / loading): 110 %
 Structure weight / hull surface area: 150 lbs/sq ft or 733 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.56
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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