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Thursday, July 07, 2005

A good version of the Ger/BB/1909A battleship design

With what I now know about Springsharp, the Ger/BB/1909A design came out quite well. The drawing and specifications were probably from 1973, as the drawing is done in that style. The ship comes out quite fast, as the size is such that the armor is not that significant. Admittedly, the machinery is fairly light for the power. The armament is 9-12in/50 BLR and 8-6in/50 QF. The speed is 27 knots. The displacement is 33,500 tons. This is the Springsharp report:
Ger/BB/1909A, Enter country Enter ship type laid down 1909 (Engine 1917)

Displacement:
 29,893 t light; 31,003 t standard; 33,500 t normal; 35,498 t full load

Dimensions: Length overall / water x beam x draught
 645.00 ft / 645.00 ft x 106.00 ft x 30.00 ft (normal load)
 196.60 m / 196.60 m x 32.31 m  x 9.14 m

Armament:
      9 - 12.00" / 305 mm guns (3x3 guns), 864.00lbs / 391.90kg shells, 1909 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1909 Model
   Quick firing guns in deck mounts with hoists
   on side, evenly spread
 Weight of broadside 8,640 lbs / 3,919 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 14.0" / 356 mm 450.00 ft / 137.16 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 107 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 450.00 ft / 137.16 m 28.00 ft / 8.53 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 10.0" / 254 mm  14.0" / 356 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 5.00" / 127 mm, Conning tower: 14.00" / 356 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 96,329 shp / 71,861 Kw = 27.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 4,495 tons

Complement:
 1,237 - 1,609

Cost:
 £2.448 million / $9.791 million

Distribution of weights at normal displacement:
 Armament: 1,080 tons, 3.2 %
 Armour: 13,134 tons, 39.2 %
    - Belts: 4,625 tons, 13.8 %
    - Torpedo bulkhead: 932 tons, 2.8 %
    - Armament: 2,759 tons, 8.2 %
    - Armour Deck: 4,504 tons, 13.4 %
    - Conning Tower: 313 tons, 0.9 %
 Machinery: 3,531 tons, 10.5 %
 Hull, fittings & equipment: 12,148 tons, 36.3 %
 Fuel, ammunition & stores: 3,607 tons, 10.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   63,900 lbs / 28,985 Kg = 74.0 x 12.0 " / 305 mm shells or 11.2 torpedoes
 Stability (Unstable if below 1.00): 1.14
 Metacentric height 7.0 ft / 2.1 m
 Roll period: 16.8 seconds
 Steadiness - As gun platform (Average = 50 %): 70 %
   - Recoil effect (Restricted arc if above 1.00): 0.42
 Seaboat quality  (Average = 1.00): 1.40

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.572
 Length to Beam Ratio: 6.08 : 1
 'Natural speed' for length: 25.40 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  32.00 ft / 9.75 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: 26.60 ft / 8.11 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 72.9 %
  - Above water (accommodation/working, high = better): 200.8 %
 Waterplane Area: 48,694 Square feet or 4,524 Square metres
 Displacement factor (Displacement / loading): 116 %
 Structure weight / hull surface area: 176 lbs/sq ft or 857 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 1.98
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily

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