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Wednesday, May 23, 2007

Another try at the Ger/CS/1905 design

I have an semi-acceptable Springsharp 3.0b1 Beta design for the Ger/CS/1905 design. I have had trouble getting an acceptable photo, but this probably gives a good picture of one of the ships at speed:

I should be able to do better, I keep thinking. I was only able to achieve 35 knots, rather than 36 knots that I had hoped. This is with 52.395 SHP/ton machinery. Remember that with 1907 technology, the British Swift was able to produce 60 SHP/ton. The 52.395 should be reasonable, given that the British were able to do this with a similar ship. The main difficulty is that Springsharp requires too much power for the speed. This is the Springsharp report:
Ger/CS/1905, Germany Scout Cruiser laid down 1905 (Engine 1950)

Displacement:
 1,825 t light; 1,879 t standard; 2,031 t normal; 2,153 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (372.95 ft / 370.00 ft) x 38.00 ft x (13.00 / 13.50 ft)
 (113.67 m / 112.78 m) x 11.58 m  x (3.96 / 4.11 m)

Armament:
      5 - 4.00" / 102 mm 50.0 cal guns - 32.00lbs / 14.51kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts , 1905 Model
   3 x Single mounts on centreline ends, majority aft
   2 x Single mounts on sides, forward deck forward
 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 185.00 ft / 56.39 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 2.00" / 51 mm   90.00 ft / 27.43 m 8.00 ft / 2.44 m
   Main Belt covers 77 % 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, 
 Geared drive, 2 shafts, 53,757 shp / 40,103 Kw = 35.00 kts
 Range 4,200nm at 14.00 kts
 Bunker at max displacement = 274 tons

Complement:
 150 - 196

Cost:
 £0.226 million / $0.903 million

Distribution of weights at normal displacement:
 Armament: 52 tons, 2.6 %
 Armour: 227 tons, 11.2 %
    - Belts: 203 tons, 10.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 24 tons, 1.2 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 1,026 tons, 50.5 %
 Hull, fittings & equipment: 551 tons, 27.1 %
 Fuel, ammunition & stores: 206 tons, 10.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   553 lbs / 251 Kg = 17.3 x 4.0 " / 102 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.34
 Metacentric height 2.0 ft / 0.6 m
 Roll period: 11.4 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.15
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has raised forecastle,
   a normal bow and a round stern
 Block coefficient (normal/deep): 0.389 / 0.397
 Length to Beam Ratio: 9.74 : 1
 'Natural speed' for length: 19.24 kts
 Power going to wave formation at top speed: 68 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 7.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 29.00 %,  24.00 ft / 7.32 m,  22.00 ft / 6.71 m
    - Forward deck: 30.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Aft deck: 26.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Quarter deck: 15.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Average freeboard:  16.55 ft / 5.05 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 171.3 %
  - Above water (accommodation/working, high = better): 142.0 %
 Waterplane Area: 8,605 Square feet or 799 Square metres
 Displacement factor (Displacement / loading): 68 %
 Structure weight / hull surface area: 32 lbs/sq ft or 157 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.44
  - Longitudinal: 1.87
  - Overall: 0.51
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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