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Wednesday, June 22, 2005

The scout cruiser design Ger/CS/1915

I don't believe that I have written about this previously. I have a pencil drawing for a scout cruiser design to be part of the emergency war program for 1915. They were to be called S-8 to S-19, so I would have built 12. The armament was 4-6in QF guns and 4-23.6in TT. The look is very German with two funnels with slanting caps and a raised forecastle that is relatively short. This is the Springsharp report:
Ger/CS/1915, Germany Scout Cruiser laid down 1915 (Engine 1933)

Displacement:
 2,121 t light; 2,206 t standard; 2,606 t normal; 2,926 t full load

Dimensions: Length overall / water x beam x draught
 355.87 ft / 355.00 ft x 37.00 ft x 16.00 ft (normal load)
 108.47 m / 108.20 m x 11.28 m  x 4.88 m

Armament:
      4 - 6.00" / 152 mm guns in single mounts, 100.00lbs / 45.36kg shells, 1915 Model
   Breech loading guns in deck mounts with hoists
   on centreline ends, evenly spread, 1 raised mount
 Weight of broadside 400 lbs / 181 kg
 Shells per gun, main battery: 150
 4 - 23.6" / 599.44 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 59,122 shp / 44,105 Kw = 34.00 kts
 Range 4,500nm at 18.00 kts
 Bunker at max displacement = 720 tons

Complement:
 182 - 237

Cost:
 £0.464 million / $1.856 million

Distribution of weights at normal displacement:
 Armament: 54 tons, 2.1 %
 Machinery: 1,424 tons, 54.7 %
 Hull, fittings & equipment: 642 tons, 24.7 %
 Fuel, ammunition & stores: 485 tons, 18.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   551 lbs / 250 Kg = 5.1 x 6.0 " / 152 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.53
 Metacentric height 2.3 ft / 0.7 m
 Roll period: 10.2 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.41
 Seaboat quality  (Average = 1.00): 1.06

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.434
 Length to Beam Ratio: 9.59 : 1
 'Natural speed' for length: 18.84 kts
 Power going to wave formation at top speed: 70 %
 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
    - Mid (26 %):  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: 17.24 ft / 5.25 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 192.0 %
  - Above water (accommodation/working, high = better): 100.2 %
 Waterplane Area: 8,273 Square feet or 769 Square metres
 Displacement factor (Displacement / loading): 67 %
 Structure weight / hull surface area: 35 lbs/sq ft or 172 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.44
  - Longitudinal: 2.45
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate

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