Amazon Ad

Friday, March 24, 2006

Not inspiring, but workmanlike: the F/BB/1933 battleship design

The F/BB/1933 design has nothing very exciting about it, but it is pretty compact and capable. The main improvements are a 30 knot speed and improved AA armament. The heavy AA guns are now 100mm, with 40-47mm AA guns. For a small increase and length and displacement, a higher speed was able to be achieved. The ship is only slightly faster than the optimal speed for the length. The only knock on the design is that it "tends to be wet forward". As an aside, Frank Fox says that most of the American fast battleships tended to be wet, and not have the best seakeeping characteristics. This is the Springsharp report:
F/BB/1933, France Battleship laid down 1933

Displacement:
 50,954 t light; 53,056 t standard; 56,200 t normal; 58,715 t full load

Dimensions: Length overall / water x beam x draught
 819.71 ft / 815.00 ft x 112.00 ft x 33.00 ft (normal load)
 249.85 m / 248.41 m x 34.14 m  x 10.06 m

Armament:
      8 - 16.93" / 430 mm guns (2x4 guns), 2,425.91lbs / 1,100.37kg shells, 1933 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, 1933 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, 1933 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      40 - 1.85" / 47.0 mm guns (20x2 guns), 3.17lbs / 1.44kg shells, 1933 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 16 raised mounts
 Weight of broadside 21,529 lbs / 9,765 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 14.0" / 356 mm 560.00 ft / 170.69 m 16.00 ft / 4.88 m
 Ends: 5.00" / 127 mm 235.00 ft / 71.63 m 12.00 ft / 3.66 m
   20.00 ft / 6.10 m Unarmoured ends
   Main Belt covers 106 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 550.00 ft / 167.64 m 30.00 ft / 9.14 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 11.0" / 279 mm  14.0" / 356 mm
 2nd: 5.00" / 127 mm 5.00" / 127 mm  5.00" / 127 mm

   - Armour deck: 7.00" / 178 mm, Conning tower: 15.00" / 381 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 186,456 shp / 139,096 Kw = 30.00 kts
 Range 8,500nm at 15.00 kts
 Bunker at max displacement = 5,660 tons

Complement:
 1,824 - 2,372

Cost:
 £22.712 million / $90.850 million

Distribution of weights at normal displacement:
 Armament: 2,691 tons, 4.8 %
 Armour: 21,248 tons, 37.8 %
    - Belts: 5,890 tons, 10.5 %
    - Torpedo bulkhead: 1,832 tons, 3.3 %
    - Armament: 3,972 tons, 7.1 %
    - Armour Deck: 9,080 tons, 16.2 %
    - Conning Tower: 474 tons, 0.8 %
 Machinery: 5,433 tons, 9.7 %
 Hull, fittings & equipment: 21,582 tons, 38.4 %
 Fuel, ammunition & stores: 5,246 tons, 9.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   82,674 lbs / 37,500 Kg = 34.1 x 16.9 " / 430 mm shells or 13.3 torpedoes
 Stability (Unstable if below 1.00): 1.11
 Metacentric height 7.2 ft / 2.2 m
 Roll period: 17.5 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.68
 Seaboat quality  (Average = 1.00): 1.09

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.653
 Length to Beam Ratio: 7.28 : 1
 'Natural speed' for length: 28.55 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: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 27.00 ft / 8.23 m
    - Mid (67 %):  27.00 ft / 8.23 m (19.00 ft / 5.79 m aft of break)
    - Quarterdeck (15 %): 19.00 ft / 5.79 m
    - Stern:  19.00 ft / 5.79 m
    - Average freeboard: 24.68 ft / 7.52 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 82.1 %
  - Above water (accommodation/working, high = better): 181.5 %
 Waterplane Area: 70,118 Square feet or 6,514 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 224 lbs/sq ft or 1,094 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.97
  - Longitudinal: 1.35
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent

No comments:

Amazon Context Links