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Saturday, August 27, 2005

I have a sheet that must go with a drawing I have seen for an alternate GB/CB/1905 design

This is more like what Frank Fox and David K. Brown had recommended to me in 2001. They had actually recommended 8-12in guns and a 6in belt, with less speed than 32 or 33 knots. This seems to be an alternate specification that would accompany a drawing I have seen for an alternate GB/CB/1905 design with 6-12in and 8-6in guns. The belt would be 4-6in and the speed would be 31.2knots. To achieve adequate hull strength, I needed to cheat in Springsharp and use lighter-weight machinery. The ship is very pleasant three twin turrets, the second in a superfiring position, a tripod foremast and twin funnels with the fore funnel raised. This is the Springsharp report:
GB/CB/1905 Design Study, Enter country Enter ship type laid down 1905 (Engine 1910)

Displacement:
 22,796 t light; 23,601 t standard; 26,500 t normal; 28,819 t full load

Dimensions: Length overall / water x beam x draught
 770.00 ft / 770.00 ft x 85.00 ft x 26.00 ft (normal load)
 234.70 m / 234.70 m x 25.91 m  x 7.92 m

Armament:
      6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1905 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, 1905 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 6,048 lbs / 2,743 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 540.00 ft / 164.59 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 4.00" / 102 mm 540.00 ft / 164.59 m 8.00 ft / 2.44 m
   Main Belt covers 108 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 540.00 ft / 164.59 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 4.00" / 102 mm  8.00" / 203 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 130,202 shp / 97,130 Kw = 31.20 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 5,218 tons

Complement:
 1,038 - 1,350

Cost:
 £2.186 million / $8.744 million

Distribution of weights at normal displacement:
 Armament: 756 tons, 2.9 %
 Armour: 5,948 tons, 22.4 %
    - Belts: 1,795 tons, 6.8 %
    - Torpedo bulkhead: 999 tons, 3.8 %
    - Armament: 1,318 tons, 5.0 %
    - Armour Deck: 1,682 tons, 6.3 %
    - Conning Tower: 153 tons, 0.6 %
 Machinery: 5,380 tons, 20.3 %
 Hull, fittings & equipment: 10,711 tons, 40.4 %
 Fuel, ammunition & stores: 3,704 tons, 14.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   38,534 lbs / 17,479 Kg = 44.6 x 12.0 " / 305 mm shells or 4.9 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 5.2 ft / 1.6 m
 Roll period: 15.6 seconds
 Steadiness - As gun platform (Average = 50 %): 74 %
   - Recoil effect (Restricted arc if above 1.00): 0.64
 Seaboat quality  (Average = 1.00): 1.48

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.545
 Length to Beam Ratio: 9.06 : 1
 'Natural speed' for length: 27.75 kts
 Power going to wave formation at top speed: 51 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -1.00 ft / -0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (67 %):  30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break)
    - Quarterdeck (15 %): 22.00 ft / 6.71 m
    - Stern:  22.00 ft / 6.71 m
    - Average freeboard: 27.60 ft / 8.41 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 114.4 %
  - Above water (accommodation/working, high = better): 231.8 %
 Waterplane Area: 45,465 Square feet or 4,224 Square metres
 Displacement factor (Displacement / loading): 116 %
 Structure weight / hull surface area: 152 lbs/sq ft or 743 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.37
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 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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