Amazon Ad

Sunday, March 13, 2005

The GB/BB/1908 battleship design (Hindustan)

My friend Cliff's 1908 battleship design had three triple 12in gun turrets. The maximum speed was 25 knots with the armor basis being 13in. The ship was intended to fill the battleship-cruiser role. Hopefully, there are no glaring errors that I'm not seeing. This is the Springsharp report:
GB/BB/1908, Great Britain Battleship laid down 1908 (Engine 1917)

Displacement:
 25,937 t light; 27,011 t standard; 29,298 t normal; 31,128 t full load

Dimensions: Length overall / water x beam x draught
 650.00 ft / 650.00 ft x 100.00 ft x 29.00 ft (normal load)
 198.12 m / 198.12 m x 30.48 m  x 8.84 m

Armament:
      9 - 12.00" / 305 mm guns (3x3 guns), 864.00lbs / 391.90kg shells, 1908 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, all raised mounts - superfiring
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1908 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 8,640 lbs / 3,919 kg
 Shells per gun, main battery: 100

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.0" / 330 mm 430.00 ft / 131.06 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 102 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 430.00 ft / 131.06 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.0" / 330 mm 7.00" / 178 mm  13.0" / 330 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 4.00" / 102 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 63,971 shp / 47,722 Kw = 25.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 4,117 tons

Complement:
 1,119 - 1,455

Cost:
 £2.143 million / $8.573 million

Distribution of weights at normal displacement:
 Armament: 1,080 tons, 3.7 %
 Armour: 11,160 tons, 38.1 %
    - Belts: 4,118 tons, 14.1 %
    - Torpedo bulkhead: 859 tons, 2.9 %
    - Armament: 2,660 tons, 9.1 %
    - Armour Deck: 3,338 tons, 11.4 %
    - Conning Tower: 184 tons, 0.6 %
 Machinery: 2,345 tons, 8.0 %
 Hull, fittings & equipment: 11,352 tons, 38.7 %
 Fuel, ammunition & stores: 3,361 tons, 11.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   50,076 lbs / 22,714 Kg = 58.0 x 12.0 " / 305 mm shells or 10.0 torpedoes
 Stability (Unstable if below 1.00): 1.03
 Metacentric height 5.3 ft / 1.6 m
 Roll period: 18.2 seconds
 Steadiness - As gun platform (Average = 50 %): 83 %
   - Recoil effect (Restricted arc if above 1.00): 0.54
 Seaboat quality  (Average = 1.00): 1.66

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.544
 Length to Beam Ratio: 6.50 : 1
 'Natural speed' for length: 25.50 kts
 Power going to wave formation at top speed: 48 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -1.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (67 %): 28.00 ft / 8.53 m
    - Mid (67 %):  28.00 ft / 8.53 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: 25.83 ft / 7.87 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 68.2 %
  - Above water (accommodation/working, high = better): 145.9 %
 Waterplane Area: 45,109 Square feet or 4,191 Square metres
 Displacement factor (Displacement / loading): 120 %
 Structure weight / hull surface area: 174 lbs/sq ft or 850 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.83
  - 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
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather

No comments:

Amazon Context Links