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Saturday, July 16, 2005

My original concept for a German scout for 1905

My original concept for a German scout for 1905 was rather like the later British Botha class, except faster. I was able to come close to the original concept in Springsharp. The draft had to be increased from 12ft to 13ft and the normal displacement had to be increased to 2,250 tons from 2,200 tons. The machinery necessarily had to be the highest power output possible, which was 56.29 SHP/ton of machinery. This approaches the 60SHP/ton of the Swift, which was a contemporary. The Swift suffered, however, from being considerably overweight. This is the Springsharp report:
Ger/CS/1905 Original Concept, Enter country Enter ship type laid down 1905 (Engine 1950)

Displacement:
 2,056 t light; 2,120 t standard; 2,250 t normal; 2,354 t full load

Dimensions: Length overall / water x beam x draught
 365.00 ft / 365.00 ft x 37.00 ft x 13.00 ft (normal load)
 111.25 m / 111.25 m x 11.28 m  x 3.96 m

Armament:
      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 ends, evenly spread
      4 - 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 amidships
 Weight of broadside 192 lbs / 87 kg
 Shells per gun, main battery: 150
 2 - 18.0" / 457.2 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 2 shafts, 76,781 shp / 57,278 Kw = 37.00 kts
 Range 2,800nm at 15.00 kts
 Bunker at max displacement = 234 tons

Complement:
 163 - 212

Cost:
 £0.283 million / $1.132 million

Distribution of weights at normal displacement:
 Armament: 24 tons, 1.1 %
 Machinery: 1,364 tons, 60.6 %
 Hull, fittings & equipment: 668 tons, 29.7 %
 Fuel, ammunition & stores: 194 tons, 8.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   492 lbs / 223 Kg = 15.4 x 4.0 " / 102 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.44
 Metacentric height 2.1 ft / 0.6 m
 Roll period: 10.7 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.23
 Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.449
 Length to Beam Ratio: 9.86 : 1
 'Natural speed' for length: 19.10 kts
 Power going to wave formation at top speed: 73 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  26.00 ft / 7.92 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (34 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 18.88 ft / 5.75 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 203.7 %
  - Above water (accommodation/working, high = better): 164.8 %
 Waterplane Area: 8,604 Square feet or 799 Square metres
 Displacement factor (Displacement / loading): 58 %
 Structure weight / hull surface area: 34 lbs/sq ft or 167 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.42
  - Longitudinal: 3.19
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is extremely poor
 Room for accommodation and workspaces is excellent

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