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Thursday, February 22, 2007

My latest (failed) attempt at Colonel Cuniberti's "Ideal Battleship"

My latest attempt to design Colonel Cuniberti's "An Ideal Battleship for the British Fleet" works no better than any other attempt. Perhaps that is an exaggeration, to some extent, as this ship has adequate stability, seakeeping, and the recoil is acceptable. The steadiness is substandard, and probably the only way to fix that is to increase the beam or change the gun layout. The protection is also reduced, as there is no complete 12in belt. The ends are 6in, in this version, done with Springsharp 3.0b Beta. This is the Springsharp report:
Ideal Battleship, Great Britain Battleship laid down 1904 (Engine 1912)

Displacement:
 19,106 t light; 20,064 t standard; 21,436 t normal; 22,534 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (535.50 ft / 521.50 ft) x 82.00 ft x (27.50 / 28.69 ft)
 (163.22 m / 158.95 m) x 24.99 m  x (8.38 / 8.74 m)

Armament:
      8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts , 1904 Model
   2 x Twin mounts on centreline ends, evenly spread
   2 x Twin mounts on sides, forward deck aft
  2 double raised mounts
      4 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts , 1904 Model
   4 x Single mounts on sides, evenly spread
      12 - 3.00" / 76.2 mm 45.0 cal guns - 12.00lbs / 5.44kg shells, 90 per gun
   Quick firing guns in casemate mounts , 1904 Model
   12 x Single mounts on sides, evenly spread
  12 hull mounts in casemates- Limited use in heavy seas
 Weight of broadside 10,600 lbs / 10,600 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 340.00 ft / 103.63 m 8.00 ft / 2.44 m
 Ends: 6.00" / 152 mm 181.50 ft / 55.32 m 8.00 ft / 2.44 m
 Upper: 12.0" / 305 mm 190.00 ft / 57.91 m 8.00 ft / 2.44 m
   Main Belt covers 100 % of normal length

   - Torpedo Bulkhead:
  1.00" / 25 mm 340.00 ft / 103.63 m 27.50 ft / 8.38 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 7.00" / 178 mm  12.0" / 305 mm
 2nd: 12.0" / 305 mm 7.00" / 178 mm  12.0" / 305 mm
 3rd: 6.00" / 152 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 12.00" / 305 mm

Machinery:
 Coal fired boilers, steam turbines, 
 ERROR: Revise drives, 4 shafts, 35,655 shp / 26,599 Kw = 22.00 kts
 Range 5,200nm at 12.00 kts
 Bunker at max displacement = 2,470 tons (100% coal)

Complement:
 885 - 1,151

Cost:
 £1.872 million / $7.487 million

Distribution of weights at normal displacement:
 Armament: 2,031 tons, 9.5 %
 Armour: 7,769 tons, 36.2 %
    - Belts: 2,691 tons, 12.6 %
    - Torpedo bulkhead: 346 tons, 1.6 %
    - Armament: 3,334 tons, 15.6 %
    - Armour Deck: 1,199 tons, 5.6 %
    - Conning Tower: 200 tons, 0.9 %
 Machinery: 1,564 tons, 7.3 %
 Hull, fittings & equipment: 8,601 tons, 40.1 %
 Fuel, ammunition & stores: 2,331 tons, 10.9 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   31,135 lbs / 14,122 Kg = 36.0 x 12.0 " / 305 mm shells or 5.1 torpedoes
 Stability (Unstable if below 1.00): 1.03
 Metacentric height 4.0 ft / 1.2 m
 Roll period: 17.3 seconds
 Steadiness - As gun platform (Average = 50 %): 45 %
   - Recoil effect (Restricted arc if above 1.00): 0.98
 Seaboat quality  (Average = 1.00): 1.11

Hull form characteristics:
 Hull has raised forecastle,
   a ram bow and a round stern
 Block coefficient (normal/deep): 0.638 / 0.643
 Length to Beam Ratio: 6.36 : 1
 'Natural speed' for length: 22.84 kts
 Power going to wave formation at top speed: 50 %
 Trim (Max stability = 0, Max steadiness = 100): 36
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 6.00 ft / 1.83 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 8.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Forward deck: 30.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Aft deck: 47.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Quarter deck: 15.00 %,  20.00 ft / 6.10 m,  20.00 ft / 6.10 m
    - Average freeboard:  20.64 ft / 6.29 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 86.3 %
  - Above water (accommodation/working, high = better): 139.5 %
 Waterplane Area: 32,400 Square feet or 3,010 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 182 lbs/sq ft or 891 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.87
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

1 comment:

David Stefanini said...

I love the blog that you have. I was wondering if you would link my blog to yours and in return I would do the same for your blog. If you want to, my site name is American Legends and the URL is:

www.americanlegends.blogspot.com

If you want to do this just go to my blog and in one of the comments just write your blog name and the URL and I will add it to my site.

Thanks,
David

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