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Saturday, February 26, 2005

Again, the GB/BB/1908 design is an amazing ship (to me)

Apparently, since the GB/BB/1908 is benefitting from a better SHP/ton figure than you might have otherwise allowed, it has become a supership. I actually had allowed 80,000 SHP for 25 knots, but Springsharp is only requiring 65,544 SHP to reach 25 knots. This is fast enough to be suitable for the "Battleship-Cruiser" role. The armament is 9-12in/50 BLR and 8-6in/50 QF guns. The belt is a respectable 13in, which is also the maximum turret face and barbette thicknesses, as well. The deck is unnaturally thick at 4in. Anyway, this is the ship that my friend Cliff designed for production, starting in 1908. I had though there were more, but the Hindustan was to be laid down in 1908, and the Falklands, Sandwich, and New Zealand in 1909.
GB/BB/1908, Great Britain Battleship laid down 1908 (Engine 1917)

Displacement:
    26,783 t light; 27,826 t standard; 30,160 t normal; 32,027 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, evenly spread, all raised mounts
    Weight of broadside 8,640 lbs / 3,919 kg
    Shells per gun, main battery: 90

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    13.0" / 330 mm    425.00 ft / 129.54 m    18.00 ft / 5.49 m
    Ends:    Unarmoured
      Main Belt covers 101 % of normal length

   - Torpedo Bulkhead:
        2.00" / 51 mm    425.00 ft / 129.54 m    27.00 ft / 8.23 m

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    13.0" / 330 mm    9.00" / 229 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, 65,544 shp / 48,896 Kw = 25.00 kts
    Range 7,500nm at 15.00 kts
    Bunker at max displacement = 4,202 tons

Complement:
    1,143 - 1,487

Cost:
    £2.181 million / $8.724 million

Distribution of weights at normal displacement:
    Armament: 1,080 tons, 3.6 %
    Armour: 11,620 tons, 38.5 %
       - Belts: 4,327 tons, 14.3 %
       - Torpedo bulkhead: 849 tons, 2.8 %
       - Armament: 2,868 tons, 9.5 %
       - Armour Deck: 3,388 tons, 11.2 %
       - Conning Tower: 188 tons, 0.6 %
    Machinery: 2,403 tons, 8.0 %
    Hull, fittings & equipment: 11,681 tons, 38.7 %
    Fuel, ammunition & stores: 3,377 tons, 11.2 %
    Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      54,293 lbs / 24,627 Kg = 62.8 x 12.0 " / 305 mm shells or 10.6 torpedoes
    Stability (Unstable if below 1.00): 1.02
    Metacentric height 5.2 ft / 1.6 m
    Roll period: 18.5 seconds
    Steadiness    - As gun platform (Average = 50 %): 84 %
            - Recoil effect (Restricted arc if above 1.00): 0.61
    Seaboat quality  (Average = 1.00): 1.68

Hull form characteristics:
    Hull has rise forward of midbreak
    Block coefficient: 0.560
    Length to Beam Ratio: 6.50 : 1
    'Natural speed' for length: 25.50 kts
    Power going to wave formation at top speed: 49 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): -2.00 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 (67 %):    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:    26.90 ft / 8.20 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 66.9 %
        - Above water (accommodation/working, high = better): 160.2 %
    Waterplane Area: 45,790 Square feet or 4,254 Square metres
    Displacement factor (Displacement / loading): 120 %
    Structure weight / hull surface area: 175 lbs/sq ft or 856 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.93
        - Longitudinal: 1.90
        - 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

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