Amazon Ad

Sunday, August 13, 2006

The Ger/BB/1909A battleship design

The Ger/BB/1909A design was intended to look more "German", as my friend Cliff had criticized my German designs for looking too "British". With an intended Standard displacement of 32,000 tons, the design was over-designed for the intended characteristics. The Springsharp design came out light, even after increasing the speed, with normal weight machinery, to 27 knots. The armour basis is 14in with a 5in deck. The armament is 9-12in/50 and 8-6in QF guns. For some reason, my secondary armaments at this time were inadequate. The protection came out heavy, even after omitting a second deck (which Springsharp really doesn't accommodate, anyway). The design is really more of a battleship-cruiser than normal battleship, as the speed is high, but with heavy armour. This is the Springsharp report:
Ger/BB/1909A, Germany Battleship laid down 1909

Displacement:
 29,537 t light; 30,650 t standard; 33,700 t normal; 36,140 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, all amidships
 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 375.00 ft / 114.30 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 89 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 375.00 ft / 114.30 m 30.00 ft / 9.14 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 6.00" / 152 mm  14.0" / 356 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

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

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 96,837 shp / 72,240 Kw = 27.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 5,490 tons

Complement:
 1,243 - 1,616

Cost:
 £2.557 million / $10.229 million

Distribution of weights at normal displacement:
 Armament: 1,080 tons, 3.2 %
 Armour: 12,054 tons, 35.8 %
    - Belts: 3,793 tons, 11.3 %
    - Torpedo bulkhead: 833 tons, 2.5 %
    - Armament: 2,595 tons, 7.7 %
    - Armour Deck: 4,519 tons, 13.4 %
    - Conning Tower: 315 tons, 0.9 %
 Machinery: 4,402 tons, 13.1 %
 Hull, fittings & equipment: 12,001 tons, 35.6 %
 Fuel, ammunition & stores: 4,163 tons, 12.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   56,245 lbs / 25,512 Kg = 65.1 x 12.0 " / 305 mm shells or 9.0 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 7.4 ft / 2.3 m
 Roll period: 16.3 seconds
 Steadiness - As gun platform (Average = 50 %): 67 %
   - Recoil effect (Restricted arc if above 1.00): 0.38
 Seaboat quality  (Average = 1.00): 1.34

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.575
 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 %): 28.00 ft / 8.53 m
    - Mid (65 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 25.52 ft / 7.78 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 82.6 %
  - Above water (accommodation/working, high = better): 191.2 %
 Waterplane Area: 48,850 Square feet or 4,538 Square metres
 Displacement factor (Displacement / loading): 114 %
 Structure weight / hull surface area: 175 lbs/sq ft or 852 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.85
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

No comments:

Amazon Context Links