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Friday, April 27, 2007

I had to go large with the German H44 class

To make the German H44 design study work in Springsharp 3.0b1 Beta, I had to "go large". The displacment had to be greater to achieve adequate structural strength. I got the specifications from the Wikipedia page. I used the drawing at the German Navy website. This is the Springsharp report:
H44, Germany Battleship laid down 1942 (Engine 1945)

Displacement:
 116,674 t light; 122,502 t standard; 141,444 t normal; 156,598 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (1,155.56 ft / 1,133.00 ft) x 169.00 ft x (41.50 / 45.21 ft)
 (352.21 m / 345.34 m) x 51.51 m  x (12.65 / 13.78 m)

Armament:
      8 - 20.00" / 508 mm 50.0 cal guns - 4,250.00lbs / 1,927.77kg shells, 150 per gun
   Breech loading guns in turret on barbette mounts , 1942 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      12 - 5.91" / 150 mm 55.0 cal guns - 112.00lbs / 50.80kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts , 1942 Model
   6 x Twin mounts on sides, evenly spread
      16 - 4.13" / 105 mm 55.0 cal guns - 38.13lbs / 17.29kg shells, 150 per gun
   Anti-air guns in deck and hoist mounts , 1942 Model
   8 x Twin mounts on sides, evenly spread
  8 raised mounts
      16 - 1.46" / 37.0 mm 60.0 cal guns - 1.69lbs / 0.77kg shells, 150 per gun
   Anti-air guns in deck mounts , 1942 Model
   8 x Twin mounts on sides, evenly spread
  8 raised mounts
      40 - 0.79" / 20.0 mm 60.0 cal guns - 0.27lbs / 0.12kg shells, 150 per gun
   Anti-air guns in deck mounts , 1942 Model
   20 x Single mounts on sides, evenly spread
  20 raised mounts
 Weight of broadside 35,992 lbs / 35,992 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 15.0" / 381 mm 640.00 ft / 195.07 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 87 % of normal length

   - Torpedo Bulkhead:
  8.00" / 203 mm 640.00 ft / 195.07 m 41.50 ft / 12.65 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 15.0" / 381 mm 11.0" / 279 mm  15.0" / 381 mm
 2nd: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 3rd: 1.00" / 25 mm       -   1.00" / 25 mm

   - Armour deck: 13.00" / 330 mm, Conning tower: 15.00" / 381 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 289,757 shp / 216,159 Kw = 29.80 kts
 Range 20,000nm at 19.00 kts
 Bunker at max displacement = 34,096 tons

Complement:
 3,646 - 4,740

Cost:
 £56.276 million / $225.104 million

Distribution of weights at normal displacement:
 Armament: 6,093 tons, 4.3 %
 Armour: 57,458 tons, 40.6 %
    - Belts: 6,913 tons, 4.9 %
    - Torpedo bulkhead: 7,862 tons, 5.6 %
    - Armament: 7,397 tons, 5.2 %
    - Armour Deck: 34,409 tons, 24.3 %
    - Conning Tower: 877 tons, 0.6 %
 Machinery: 7,317 tons, 5.2 %
 Hull, fittings & equipment: 47,451 tons, 33.5 %
 Fuel, ammunition & stores: 24,771 tons, 17.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   365,705 lbs / 165,881 Kg = 91.4 x 20.0 " / 508 mm shells or 127.3 torpedoes
 Stability (Unstable if below 1.00): 1.42
 Metacentric height 20.2 ft / 6.2 m
 Roll period: 15.8 seconds
 Steadiness - As gun platform (Average = 50 %): 74 %
   - Recoil effect (Restricted arc if above 1.00): 0.26
 Seaboat quality  (Average = 1.00): 1.48

Hull form characteristics:
 Hull has low forecastle,
   a normal bow and a cruiser stern
 Block coefficient (normal/deep): 0.623 / 0.633
 Length to Beam Ratio: 6.70 : 1
 'Natural speed' for length: 33.66 kts
 Power going to wave formation at top speed: 45 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 20.00 degrees
 Stern overhang: 8.00 ft / 2.44 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  40.00 ft / 12.19 m,  30.00 ft / 9.14 m
    - Forward deck: 30.00 %,  32.00 ft / 9.75 m,  28.00 ft / 8.53 m
    - Aft deck: 35.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Quarter deck: 15.00 %,  28.00 ft / 8.53 m,  28.00 ft / 8.53 m
    - Average freeboard:  29.80 ft / 9.08 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 48.0 %
  - Above water (accommodation/working, high = better): 216.2 %
 Waterplane Area: 143,075 Square feet or 13,292 Square metres
 Displacement factor (Displacement / loading): 131 %
 Structure weight / hull surface area: 259 lbs/sq ft or 1,266 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.00
  - Longitudinal: 1.02
  - 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
 Good seaboat, rides out heavy weather easily

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