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Tuesday, September 04, 2007

Light weight machinery makes all sorts of things possible: the Ger/CS/1909 variant

I don't have the exact specification along, but I know the general outline of the Ger/CS/1909 fast scout design. By using the lightest machinery allowed by Springsharp 3.0b2 Beta, I was able to achieve the desired 35 knot speed. The draft and freeboard are rather large, but "it works". The ship was intended to have 4-5in guns, 2-21in TT, and a 35 knot speed. This is a photograph of one of the ships at sea:

This is the Springsharp report:
Ger/CS/1909 Variant, Germany Scout laid down 1909 (Engine 1950)

Displacement:
 1,600 t light; 1,660 t standard; 1,802 t normal; 1,915 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (350.00 ft / 350.00 ft) x 36.00 ft x (13.00 / 13.52 ft)
 (106.68 m / 106.68 m) x 10.97 m  x (3.96 / 4.12 m)

Armament:
      4 - 5.00" / 127 mm 50.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1909 Model
   4 x Single mounts on centreline, evenly spread
   Aft Main mounts separated by engine room
      Weight of broadside 260 lbs / 118 kg
      2 - 21.0" / 533 mm, 21.00 ft / 6.40 m torpedoes - 1.318 t each, 2.636 t total
 In 2 sets of deck mounted carriage/fixed tubes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 3.00" / 76 mm 2.00" / 51 mm  3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 51,365 shp / 38,318 Kw = 35.00 kts
 Range 4,200nm at 14.00 kts
 Bunker at max displacement = 255 tons

Complement:
 137 - 179

Cost:
 £0.214 million / $0.857 million

Distribution of weights at normal displacement:
 Armament: 82 tons, 4.5 %
    - Guns: 79 tons, 4.4 %
    - Torpedoes: 3 tons, 0.1 %
 Armour: 60 tons, 3.3 %
    - Armament: 60 tons, 3.3 %
 Machinery: 930 tons, 51.6 %
 Hull, fittings & equipment: 528 tons, 29.3 %
 Fuel, ammunition & stores: 202 tons, 11.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   466 lbs / 211 Kg = 7.5 x 5.0 " / 127 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.22
 Metacentric height 1.6 ft / 0.5 m
 Roll period: 12.1 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.38
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and a round stern
 Block coefficient (normal/deep): 0.385 / 0.394
 Length to Beam Ratio: 9.72 : 1
 'Natural speed' for length: 18.71 kts
 Power going to wave formation at top speed: 69 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  23.00 ft / 7.01 m,  22.00 ft / 6.71 m
    - Forward deck: 15.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Aft deck: 50.00 %,  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:  16.88 ft / 5.15 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 180.8 %
  - Above water (accommodation/working, high = better): 167.5 %
 Waterplane Area: 7,678 Square feet or 713 Square metres
 Displacement factor (Displacement / loading): 65 %
 Structure weight / hull surface area: 35 lbs/sq ft or 170 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.44
  - Longitudinal: 2.51
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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