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Monday, April 09, 2007

Another attempt at the Ger/CS/1905 scout cruiser

I just used Springsharp 3.0b1 Beta to do a design for the Ger/CS/1905 scout cruiser, which was my attempt at a "Super Swift", except for 1905 for the Germans. My version that I intended to produce in numbers was to have 2in armour over the machinery spaces. I could only manage 34 knots, rather than the hoped for 36 knots. The problem was seakeeping, primarily. This is my drawing of one of the ships:

This is the Springsharp report:
Ger/CS/1905, Germany Scout Cruiser laid down 1905 (Engine 1945)

Displacement:
 2,073 t light; 2,133 t standard; 2,334 t normal; 2,495 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (372.10 ft / 370.00 ft) x 38.00 ft x (14.00 / 14.65 ft)
 (113.42 m / 112.78 m) x 11.58 m  x (4.27 / 4.46 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, evenly spread
   2 x Single mounts on sides, forward evenly spread
 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 240.00 ft / 73.15 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 2.00" / 51 mm 150.00 ft / 45.72 m 8.00 ft / 2.44 m
   Main Belt covers 100 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 3.00" / 76 mm       -   3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 52,833 shp / 39,413 Kw = 34.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 362 tons

Complement:
 167 - 218

Cost:
 £0.250 million / $1.000 million

Distribution of weights at normal displacement:
 Armament: 52 tons, 2.2 %
 Armour: 305 tons, 13.1 %
    - Belts: 269 tons, 11.5 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 37 tons, 1.6 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 1,138 tons, 48.7 %
 Hull, fittings & equipment: 608 tons, 26.1 %
 Fuel, ammunition & stores: 261 tons, 11.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   681 lbs / 309 Kg = 21.3 x 4.0 " / 102 mm shells or 0.4 torpedoes
 Stability (Unstable if below 1.00): 1.30
 Metacentric height 1.9 ft / 0.6 m
 Roll period: 11.7 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.15
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has raised forecastle,
   a normal bow and a round stern
 Block coefficient (normal/deep): 0.415 / 0.424
 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): 52
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 28.00 %,  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: 27.00 %,  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:  16.46 ft / 5.02 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 164.6 %
  - Above water (accommodation/working, high = better): 129.4 %
 Waterplane Area: 8,736 Square feet or 812 Square metres
 Displacement factor (Displacement / loading): 74 %
 Structure weight / hull surface area: 35 lbs/sq ft or 170 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.49
  - Longitudinal: 1.87
  - Overall: 0.56
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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