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Saturday, May 28, 2005

Since I'm redoing Springsharp designs, here is the Ger/CS/1905 scout cruiser

The main difference about this attempt at the Ger/CS/1905 design is that I have the armament located correctly in the design. It seems a necessity, now that I know how to do it. I was able to keep the draft from getting too great, although it still is, due to the need to get adequate structural strength. The dimensions are 370ft x 38ft x 13ft. The displacement is only 2,240 tons, which is too low. The intended normal displacement is 2,480 tons. The speed is not quite what I wanted, as it is just 35 knots, not 36. The cruising speed and range are too low, but the only way to do better is to have a better SHP/ton for the machinery. I'm already skewing the date to get it. At about 45SHP/ton, it is still much below the maximum output achieved by the British super-destroyer Swift, which could produce 60SHP/ton, and in the same time period as this design. This is the Springsharp report:
Ger/CS/1905, Germany Scout Cruiser laid down 1905 (Engine 1931)

Displacement:
 2,127 t light; 2,189 t standard; 2,240 t normal; 2,282 t full load

Dimensions: Length overall / water x beam x draught
 370.84 ft / 370.00 ft x 38.00 ft x 13.00 ft (normal load)
 113.03 m / 112.78 m x 11.58 m  x 3.96 m

Armament:
      1 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
   Quick firing gun in a deck mount with hoist
   on centreline forward
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
   Quick firing guns in deck mounts with hoists
   on side, evenly spread
      2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
   Quick firing guns in deck mounts with hoists
   on centreline, all aft
 Weight of broadside 160 lbs / 73 kg
 Shells per gun, main battery: 160
 2 - 18.0" / 457.2 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 2.00" / 51 mm 135.00 ft / 41.15 m 15.00 ft / 4.57 m
 Ends: Unarmoured
   Main Belt covers 56 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 1.00" / 25 mm       -         -
 2nd: 1.00" / 25 mm       -         -
 3rd: 1.00" / 25 mm       -         -

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 58,875 shp / 43,921 Kw = 35.00 kts
 Range 2,000nm at 10.00 kts
 Bunker at max displacement = 93 tons

Complement:
 162 - 211

Cost:
 £0.273 million / $1.093 million

Distribution of weights at normal displacement:
 Armament: 20 tons, 0.9 %
 Armour: 198 tons, 8.9 %
    - Belts: 188 tons, 8.4 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 11 tons, 0.5 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 1,300 tons, 58.0 %
 Hull, fittings & equipment: 608 tons, 27.1 %
 Fuel, ammunition & stores: 113 tons, 5.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   529 lbs / 240 Kg = 16.5 x 4.0 " / 102 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.47
 Metacentric height 2.3 ft / 0.7 m
 Roll period: 10.6 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.15
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.429
 Length to Beam Ratio: 9.74 : 1
 'Natural speed' for length: 19.24 kts
 Power going to wave formation at top speed: 69 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  24.00 ft / 7.32 m
    - Forecastle (20 %): 22.00 ft / 6.71 m
    - Mid (36 %):  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: 17.04 ft / 5.19 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 194.2 %
  - Above water (accommodation/working, high = better): 153.7 %
 Waterplane Area: 8,822 Square feet or 820 Square metres
 Displacement factor (Displacement / loading): 58 %
 Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.45
  - Longitudinal: 2.09
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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