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Tuesday, June 21, 2005

The upgraded version of the Ger/CS/1905, the "Mod.A" works great

I was pleasantly surprised that the upgraded version of the Ger/CS/1905 scout cruiser, as rebuilt after 1914, works very well. I used the pencil drawing that showed the 3-6in/50 QF gun, 4-21in TT, and 2in side armor, as a guide. The one thing that I did was to reduce the maximum speed to 34 knots. That seemed like a reasonable compromise for a WWI-era ship. This is the Springsharp report:
Ger/CS/1905 Mod.A, Germany Scout Cruiser laid down 1905 (Engine 1933)

Displacement:
 2,249 t light; 2,326 t standard; 2,500 t normal; 2,639 t full load

Dimensions: Length overall / water x beam x draught
 370.87 ft / 370.00 ft x 36.00 ft x 15.00 ft (normal load)
 113.04 m / 112.78 m x 10.97 m  x 4.57 m

Armament:
      3 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, majority forward
 Weight of broadside 324 lbs / 147 kg
 Shells per gun, main battery: 150
 4 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 2.00" / 51 mm 260.00 ft / 79.25 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 108 % 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       -         -

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 55,573 shp / 41,458 Kw = 34.00 kts
 Range 3,600nm at 14.00 kts
 Bunker at max displacement = 313 tons

Complement:
 176 - 229

Cost:
 £0.295 million / $1.181 million

Distribution of weights at normal displacement:
 Armament: 41 tons, 1.6 %
 Armour: 299 tons, 12.0 %
    - Belts: 278 tons, 11.1 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 21 tons, 0.8 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 1,303 tons, 52.1 %
 Hull, fittings & equipment: 606 tons, 24.3 %
 Fuel, ammunition & stores: 251 tons, 10.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   553 lbs / 251 Kg = 5.1 x 6.0 " / 152 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.36
 Metacentric height 1.9 ft / 0.6 m
 Roll period: 11.1 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.34
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has raised forecastle, rise forward of midbreak
 Block coefficient: 0.438
 Length to Beam Ratio: 10.28 : 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): 2.00 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 (0.00 ft / 0.00 m aft of break)
    - Mid (34 %):  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: 16.27 ft / 4.96 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 180.6 %
  - Above water (accommodation/working, high = better): 102.9 %
 Waterplane Area: 8,415 Square feet or 782 Square metres
 Displacement factor (Displacement / loading): 65 %
 Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.45
  - Longitudinal: 1.90
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate

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