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Friday, September 14, 2007

The Ger/DL/1915 alternate version

An alternative version of a German destroyer leader for 1915 was 390ft long and had a beam of 40ft. I had thought that giving up one 5in mount and adding a twin 23.6in TT mount would be beneficial. With that, the design could achieve a 36 knot speed. The "look" is very German, although of a later era. There is long forecastle and two funnels with prominent caps. This the Springsharp report:
Ger/DL/1915 alternate version, Germany Destroyer Leader laid down 1915 (Engine 1950)

Displacement:
 1,745 t light; 1,818 t standard; 2,006 t normal; 2,156 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (394.23 ft / 390.00 ft) x 40.00 ft x (12.00 / 12.54 ft)
 (120.16 m / 118.87 m) x 12.19 m  x (3.66 / 3.82 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, 1915 Model
   4 x Single mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      Weight of broadside 260 lbs / 118 kg
      6 - 23.6" / 599 mm, 23.00 ft / 7.01 m torpedoes - 1.818 t each, 10.908 t total
 In 3 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, 
 Geared drive, 2 shafts, 47,569 shp / 35,487 Kw = 36.00 kts
 Range 4,000nm at 15.00 kts
 Bunker at max displacement = 338 tons

Complement:
 149 - 194

Cost:
 £0.328 million / $1.311 million

Distribution of weights at normal displacement:
 Armament: 90 tons, 4.5 %
    - Guns: 79 tons, 4.0 %
    - Torpedoes: 11 tons, 0.5 %
 Armour: 60 tons, 3.0 %
    - Armament: 60 tons, 3.0 %
 Machinery: 974 tons, 48.5 %
 Hull, fittings & equipment: 621 tons, 31.0 %
 Fuel, ammunition & stores: 260 tons, 13.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   640 lbs / 290 Kg = 10.2 x 5.0 " / 127 mm shells or 0.4 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 1.7 ft / 0.5 m
 Roll period: 12.9 seconds
 Steadiness - As gun platform (Average = 50 %): 58 %
   - Recoil effect (Restricted arc if above 1.00): 0.36
 Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
 Hull has rise forward of midbreak,
   a normal bow and large transom stern
 Block coefficient (normal/deep): 0.375 / 0.386
 Length to Beam Ratio: 9.75 : 1
 'Natural speed' for length: 22.99 kts
 Power going to wave formation at top speed: 67 %
 Trim (Max stability = 0, Max steadiness = 100): 57
 Bow angle (Positive = bow angles forward): 10.00 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 %,  24.00 ft / 7.32 m,  22.00 ft / 6.71 m
    - Forward deck: 21.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Aft deck: 44.00 %,  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:  17.44 ft / 5.32 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 169.5 %
  - Above water (accommodation/working, high = better): 202.2 %
 Waterplane Area: 9,809 Square feet or 911 Square metres
 Displacement factor (Displacement / loading): 77 %
 Structure weight / hull surface area: 36 lbs/sq ft or 176 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.44
  - Longitudinal: 1.84
  - Overall: 0.51
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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