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Sunday, September 18, 2005

The September 2, 2001 version of the Ger/CS/1905 scout cruiser

My drawing for the Ger/CS/1905 scout cruiser that I drew on September 2, 2001, is quite different from the photos that I have created in the last 6 months. This version has three low cased funnels, cut away side, facing forward, to increase the arc of fire for the guns, and torpedo tubes mounted abreast, just aft of the funnels and on each side of a boat that has a derrick mounted just aft of the after funnel. For Springsharp, I reduced the displacement, have gone with the lightest weight machinery, and increased draft and freeboard. That was necessary to obtain a sufficient seakeeping capability, while maintaining a 36 knot speed and the patch of armor over the machinery spaces. This is the Springsharp report:
Ger/CS/1905, Germany Scout Cruiser laid down 1905 (Engine 1950)

Displacement:
 2,195 t light; 2,267 t standard; 2,350 t normal; 2,417 t full load

Dimensions: Length overall / water x beam x draught
 370.44 ft / 370.00 ft x 38.00 ft x 14.00 ft (normal load)
 112.91 m / 112.78 m x 11.58 m  x 4.27 m

Armament:
      3 - 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, evenly spread
   Aft Main mounts separated by engine room
      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, all forward
 Weight of broadside 160 lbs / 73 kg
 Shells per gun, main battery: 250
 2 - 18.0" / 457.2 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 105.00 ft / 32.00 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       -         -

   - Conning tower: 3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 68,083 shp / 50,790 Kw = 36.00 kts
 Range 2,750nm at 12.00 kts
 Bunker at max displacement = 150 tons

Complement:
 168 - 219

Cost:
 £0.274 million / $1.098 million

Distribution of weights at normal displacement:
 Armament: 20 tons, 0.9 %
 Armour: 222 tons, 9.4 %
    - Belts: 197 tons, 8.4 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 13 tons, 0.6 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 11 tons, 0.5 %
 Machinery: 1,292 tons, 55.0 %
 Hull, fittings & equipment: 662 tons, 28.2 %
 Fuel, ammunition & stores: 155 tons, 6.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   593 lbs / 269 Kg = 18.5 x 4.0 " / 102 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.36
 Metacentric height 2.0 ft / 0.6 m
 Roll period: 11.3 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.17
 Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.418
 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): 50
 Bow angle (Positive = bow angles forward): 1.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  25.00 ft / 7.62 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (33 %):  23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break)
    - Quarterdeck (15 %): 15.00 ft / 4.57 m
    - Stern:  15.00 ft / 4.57 m
    - Average freeboard: 17.80 ft / 5.43 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 184.5 %
  - Above water (accommodation/working, high = better): 152.9 %
 Waterplane Area: 8,753 Square feet or 813 Square metres
 Displacement factor (Displacement / loading): 65 %
 Structure weight / hull surface area: 35 lbs/sq ft or 173 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.45
  - Longitudinal: 2.53
  - Overall: 0.53
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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