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Sunday, July 24, 2005

The Ger/CL/1914 design now works quite nicely

I just tried the Ger/CL/1914 design in Springsharp, and using the methods that I learned from The Red Admiral from WesWorld, I was able to create what seems to be a reasonable design. This is a weight comparison between my 1971 design and what Springsharp produced:
             Original      Springsharp
Machinery:   1,335 tons    1,676 tons
Hull:        1,500 tons    1,038 tons
Protection:  110 tons      222 tons
Oil Fuel:    700 tons      694 tons (max. bunker)
This is the complete Springsharp report:
Ger/CL/1914, Germany Light Cruiser laid down 1914 (Engine 1917)

Displacement:
 3,006 t light; 3,140 t standard; 3,500 t normal; 3,788 t full load

Dimensions: Length overall / water x beam x draught
 431.87 ft / 430.00 ft x 40.00 ft x 16.00 ft (normal load)
 131.63 m / 131.06 m x 12.19 m  x 4.88 m

Armament:
      3 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1914 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, majority aft, 1 raised mount aft
      6 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1914 Model
   Quick firing guns in deck mounts with hoists
   on side, evenly spread
 Weight of broadside 563 lbs / 255 kg
 Shells per gun, main battery: 180
 4 - 21.0" / 533.4 mm above water torpedoes

Armour:

   - Armour deck: 1.00" / 25 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 48,865 shp / 36,453 Kw = 32.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 648 tons

Complement:
 226 - 295

Cost:
 £0.508 million / $2.031 million

Distribution of weights at normal displacement:
 Armament: 70 tons, 2.0 %
 Armour: 222 tons, 6.3 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 0 tons, 0.0 %
    - Armour Deck: 202 tons, 5.8 %
    - Conning Tower: 20 tons, 0.6 %
 Machinery: 1,676 tons, 47.9 %
 Hull, fittings & equipment: 1,038 tons, 29.7 %
 Fuel, ammunition & stores: 494 tons, 14.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   1,151 lbs / 522 Kg = 18.4 x 5.0 " / 127 mm shells or 0.4 torpedoes
 Stability (Unstable if below 1.00): 1.39
 Metacentric height 2.3 ft / 0.7 m
 Roll period: 11.2 seconds
 Steadiness - As gun platform (Average = 50 %): 66 %
   - Recoil effect (Restricted arc if above 1.00): 0.47
 Seaboat quality  (Average = 1.00): 1.31

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.445
 Length to Beam Ratio: 10.75 : 1
 'Natural speed' for length: 20.74 kts
 Power going to wave formation at top speed: 61 %
 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:  25.00 ft / 7.62 m
    - Forecastle (20 %): 22.00 ft / 6.71 m
    - Mid (34 %):  22.00 ft / 6.71 m (14.00 ft / 4.27 m aft of break)
    - Quarterdeck (15 %): 14.00 ft / 4.27 m
    - Stern:  14.00 ft / 4.27 m
    - Average freeboard: 16.96 ft / 5.17 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 170.6 %
  - Above water (accommodation/working, high = better): 121.6 %
 Waterplane Area: 10,928 Square feet or 1,015 Square metres
 Displacement factor (Displacement / loading): 80 %
 Structure weight / hull surface area: 48 lbs/sq ft or 232 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.61
  - Longitudinal: 1.79
  - Overall: 0.67
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

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