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Tuesday, February 13, 2007

My first attempt at the Ger/CS/1905 design in Springsharp 3.0b Beta

I went ahead got a Ger/CS/1905 scout cruiser design done with Springsharp 3.0b Beta. The main problem is that too much power is required for the size ship. I always tell myself the HMS Swift, a similar ship, could achieve up to 60 SHP/ton of machinery. This is the Springsharp report:
Ger/CS/1905, Germany Scout Cruiser laid down 1905 (Engine 1945)

Displacement:
 2,304 t light; 2,368 t standard; 2,542 t normal; 2,681 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (371.75 ft / 370.00 ft) x 38.00 ft x (14.00 / 14.54 ft)
 (113.31 m / 112.78 m) x 11.58 m  x (4.27 / 4.43 m)

Armament:
      3 - 4.00" / 102 mm 50.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Breech loading guns in deck and hoist mount , 1905 Model
   2 x Single mounts on sides, forward deck centre
  2 raised mounts
      2 - 4.00" / 102 mm 50.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Breech loading guns in deck and hoist mounts , 1905 Model
   1 x Single mount on centreline, aft deck forward
  1 raised mount
   1 x Single mount on centreline, aft deck aft
  1 raised mount
 Weight of broadside 160 lbs / 160 kg
 2 - 18.0" / 457 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 2.00" / 51 mm 160.00 ft / 48.77 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 2.00" / 51 mm 100.00 ft / 30.48 m 8.00 ft / 2.44 m
   Main Belt covers 67 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 2.00" / 51 mm       -   2.00" / 51 mm

Machinery:
 Oil fired boilers, steam turbines, 
 ERROR: Revise drives, 2 shafts, 64,846 shp / 48,375 Kw = 35.00 kts
 Range 4,000nm at 14.00 kts
 Bunker at max displacement = 313 tons

Complement:
 178 - 232

Cost:
 £0.291 million / $1.163 million

Distribution of weights at normal displacement:
 Armament: 52 tons, 2.0 %
 Armour: 201 tons, 7.9 %
    - Belts: 195 tons, 7.7 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 6 tons, 0.3 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 1,371 tons, 53.9 %
 Hull, fittings & equipment: 710 tons, 27.9 %
 Fuel, ammunition & stores: 238 tons, 9.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   611 lbs / 277 Kg = 19.1 x 4.0 " / 102 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 1.7 ft / 0.5 m
 Roll period: 12.4 seconds
 Steadiness - As gun platform (Average = 50 %): 64 %
   - Recoil effect (Restricted arc if above 1.00): 0.25
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has raised forecastle,
   a normal bow and a round stern
 Block coefficient (normal/deep): 0.452 / 0.459
 Length to Beam Ratio: 9.74 : 1
 'Natural speed' for length: 19.24 kts
 Power going to wave formation at top speed: 70 %
 Trim (Max stability = 0, Max steadiness = 100): 62
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 35.00 %,  25.00 ft / 7.62 m,  23.00 ft / 7.01 m
    - Forward deck: 30.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
    - Aft deck: 20.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
    - Quarter deck: 15.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
    - Average freeboard:  18.08 ft / 5.51 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 180.6 %
  - Above water (accommodation/working, high = better): 133.8 %
 Waterplane Area: 8,983 Square feet or 835 Square metres
 Displacement factor (Displacement / loading): 70 %
 Structure weight / hull surface area: 37 lbs/sq ft or 180 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.48
  - Longitudinal: 2.58
  - Overall: 0.57
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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