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Sunday, March 26, 2006

The F/BB/1941 battleship

The F/BB/1941 battleship now has a 32-knot speed and a 16in armour basis. The torpedo bulkhead is also increased to 5in in thickness. The French need is for a ship with good speed for operating on both the Atlantic coast and the Mediterranean Sea. This is the ultimate design in this series, although the armament is unchanged, as what we have been using seems to be sufficient. This is the Springsharp report:
F/BB/1941, France Battleship laid down 1941

Displacement:
 66,183 t light; 68,781 t standard; 72,250 t normal; 75,025 t full load

Dimensions: Length overall / water x beam x draught
 910.89 ft / 905.00 ft x 120.00 ft x 35.00 ft (normal load)
 277.64 m / 275.84 m x 36.58 m  x 10.67 m

Armament:
      8 - 18.00" / 457 mm guns (2x4 guns), 2,916.00lbs / 1,322.68kg shells, 1941 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
      18 - 5.51" / 140 mm guns (6x3 guns), 83.72lbs / 37.98kg shells, 1941 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, all raised mounts - superfiring
      16 - 3.94" / 100 mm guns (8x2 guns), 30.51lbs / 13.84kg shells, 1941 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      48 - 1.85" / 47.0 mm guns (24x2 guns), 3.17lbs / 1.44kg shells, 1941 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 18 raised mounts
 Weight of broadside 25,475 lbs / 11,555 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 16.0" / 406 mm 620.00 ft / 188.98 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 105 % of normal length

   - Torpedo Bulkhead:
  5.00" / 127 mm 620.00 ft / 188.98 m 34.00 ft / 10.36 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 16.0" / 406 mm 12.0" / 305 mm  16.0" / 406 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 8.00" / 203 mm, Conning tower: 16.00" / 406 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 270,882 shp / 202,078 Kw = 32.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 6,244 tons

Complement:
 2,202 - 2,864

Cost:
 £37.051 million / $148.203 million

Distribution of weights at normal displacement:
 Armament: 3,184 tons, 4.4 %
 Armour: 28,656 tons, 39.7 %
    - Belts: 6,775 tons, 9.4 %
    - Torpedo bulkhead: 3,900 tons, 5.4 %
    - Armament: 4,897 tons, 6.8 %
    - Armour Deck: 12,486 tons, 17.3 %
    - Conning Tower: 598 tons, 0.8 %
 Machinery: 7,159 tons, 9.9 %
 Hull, fittings & equipment: 27,184 tons, 37.6 %
 Fuel, ammunition & stores: 6,067 tons, 8.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   111,186 lbs / 50,433 Kg = 38.1 x 18.0 " / 457 mm shells or 20.5 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 8.3 ft / 2.5 m
 Roll period: 17.5 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.64
 Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.665
 Length to Beam Ratio: 7.54 : 1
 'Natural speed' for length: 30.08 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (67 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 26.68 ft / 8.13 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 78.5 %
  - Above water (accommodation/working, high = better): 195.5 %
 Waterplane Area: 84,364 Square feet or 7,838 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 235 lbs/sq ft or 1,149 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.28
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent

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