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Thursday, March 30, 2006

The F/CA/1918 is a much more modern design

The F/CA/1918, with four twin 7.6in (19.5cm) gun turrets is a much more modern design than its predecessor. The secondary armament is reduced in caliber to 5.1in guns (13cm). The ship has a torpedo armament, as well. The speed is increased to 32 knots, a modern minimum. This is the Springsharp report:
F/CA/1918, France Cruiser laid down 1918 (Engine 1922)

Displacement:
 11,584 t light; 11,989 t standard; 12,900 t normal; 13,629 t full load

Dimensions: Length overall / water x beam x draught
 619.10 ft / 615.00 ft x 62.00 ft x 20.00 ft (normal load)
 188.70 m / 187.45 m x 18.90 m  x 6.10 m

Armament:
      8 - 7.68" / 195 mm guns (4x2 guns), 226.24lbs / 102.62kg shells, 1918 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, evenly spread, 2 raised mounts
   Aft Main mounts separated by engine room
      8 - 5.12" / 130 mm guns in single mounts, 67.03lbs / 30.41kg shells, 1918 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
      4 - 3.54" / 90.0 mm guns in single mounts, 22.24lbs / 10.09kg shells, 1918 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, 2 raised mounts - superfiring
      16 - 1.85" / 47.0 mm guns in single mounts, 3.17lbs / 1.44kg shells, 1918 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 8 raised mounts
 Weight of broadside 2,486 lbs / 1,128 kg
 Shells per gun, main battery: 100
 4 - 21.7" / 549.9999 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 400.00 ft / 121.92 m 12.00 ft / 3.66 m
 Ends: 3.00" / 76 mm 175.00 ft / 53.34 m 10.00 ft / 3.05 m
   40.00 ft / 12.19 m Unarmoured ends
   Main Belt covers 100 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 400.00 ft / 121.92 m 18.00 ft / 5.49 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: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 101,743 shp / 75,901 Kw = 32.00 kts
 Range 5,400nm at 15.00 kts
 Bunker at max displacement = 1,640 tons

Complement:
 604 - 786

Cost:
 £2.299 million / $9.197 million

Distribution of weights at normal displacement:
 Armament: 311 tons, 2.4 %
 Armour: 2,846 tons, 22.1 %
    - Belts: 997 tons, 7.7 %
    - Torpedo bulkhead: 266 tons, 2.1 %
    - Armament: 511 tons, 4.0 %
    - Armour Deck: 1,024 tons, 7.9 %
    - Conning Tower: 47 tons, 0.4 %
 Machinery: 3,451 tons, 26.8 %
 Hull, fittings & equipment: 4,976 tons, 38.6 %
 Fuel, ammunition & stores: 1,316 tons, 10.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   14,776 lbs / 6,702 Kg = 65.3 x 7.7 " / 195 mm shells or 1.9 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 3.3 ft / 1.0 m
 Roll period: 14.3 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.59
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.592
 Length to Beam Ratio: 9.92 : 1
 'Natural speed' for length: 24.80 kts
 Power going to wave formation at top speed: 58 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  30.00 ft / 9.14 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (67 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 21.84 ft / 6.66 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 155.2 %
  - Above water (accommodation/working, high = better): 175.6 %
 Waterplane Area: 27,681 Square feet or 2,572 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 112 lbs/sq ft or 547 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.27
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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