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Monday, July 23, 2007

Another shot at a Ger/CS/1909 scout

This is the original specification for the Ger/CS/1909 scout:
Scout   2100 tons  4-5in QF guns, 2-21in TT
   350ft x 37ft x 12ft  Cp=0.56  Cm=0.85
  45 SHP/ton = 1000 tons machinery       45,000 SHP
                900 tons hull
                 44 tons armament
                168 tons miscellaneous

I took that a tried to see what could be done with Springsharp 3.0b2 Beta. I wanted the 45,000 SHP and about 1000 tons of machinery. I ended up having to go with a lower displacement, to achieve adequate seakeeping. This is a photograph of one of the ships at sea:

This is the Springsharp report:
Ger/CS/1909, Germany Scout laid down 1909 (Engine 1937)

Displacement:
 1,598 t light; 1,660 t standard; 1,874 t normal; 2,045 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (350.00 ft / 350.00 ft) x 37.00 ft x (12.00 / 12.74 ft)
 (106.68 m / 106.68 m) x 11.28 m  x (3.66 / 3.88 m)

Armament:
      4 - 5.00" / 127 mm 50.0 cal guns - 66.16lbs / 30.01kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1909 Model
   3 x Single mounts on centreline ends, majority aft
   1 x Single mount on centreline, forward deck aft
  1 raised mount aft
      Weight of broadside 265 lbs / 120 kg
      2 - 21.0" / 533 mm, 20.00 ft / 6.10 m torpedoes - 1.259 t each, 2.518 t total
 In 2 sets of deck mounted centre rotating tubes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 3.00" / 76 mm 1.00" / 25 mm  3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 44,965 shp / 33,544 Kw = 33.50 kts
 Range 4,800nm at 15.00 kts
 Bunker at max displacement = 385 tons

Complement:
 142 - 185

Cost:
 £0.220 million / $0.879 million

Distribution of weights at normal displacement:
 Armament: 82 tons, 4.4 %
    - Guns: 79 tons, 4.2 %
    - Torpedoes: 3 tons, 0.1 %
 Armour: 36 tons, 1.9 %
    - Armament: 36 tons, 1.9 %
 Machinery: 970 tons, 51.8 %
 Hull, fittings & equipment: 509 tons, 27.2 %
 Fuel, ammunition & stores: 276 tons, 14.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   503 lbs / 228 Kg = 8.0 x 5.0 " / 127 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.30
 Metacentric height 1.8 ft / 0.5 m
 Roll period: 11.6 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - 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 cruiser stern
 Block coefficient (normal/deep): 0.422 / 0.434
 Length to Beam Ratio: 9.46 : 1
 'Natural speed' for length: 18.71 kts
 Power going to wave formation at top speed: 68 %
 Trim (Max stability = 0, Max steadiness = 100): 53
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: -3.00 ft / -0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 15.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Forward deck: 18.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Aft deck: 52.00 %,  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:  16.64 ft / 5.07 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 180.8 %
  - Above water (accommodation/working, high = better): 142.1 %
 Waterplane Area: 8,085 Square feet or 751 Square metres
 Displacement factor (Displacement / loading): 67 %
 Structure weight / hull surface area: 34 lbs/sq ft or 167 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.44
  - Longitudinal: 2.10
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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