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Wednesday, June 06, 2007

An alternative Ger/DL/1915 design

I had another Ger/DL/1915 design study that took a different approach. The ship is much longer, and because of that, is able to make 35 knots. The armament is changed in flavor to favor torpedoes: 4-5in QF guns and 6-23.6in TT with reloads. The look is very German, with twin funnels and caps. This is the Springsharp report:
Ger/DL/1915 alternative design, Germany Destroyer Leader laid down 1915 (Engine 1950)

Displacement:
 1,718 t light; 1,780 t standard; 2,011 t normal; 2,196 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (393.37 ft / 390.00 ft) x 40.00 ft x (12.00 / 12.68 ft)
 (119.90 m / 118.87 m) x 12.19 m  x (3.66 / 3.86 m)

Armament:
      4 - 5.00" / 127 mm 50.0 cal guns - 66.16lbs / 30.01kg shells, 150 per gun
   Breech loading guns in deck and hoist mounts , 1915 Model
   4 x Single mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
 Weight of broadside 265 lbs / 265 kg
 6 - 23.6" / 599 mm above water torpedoes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 2.00" / 51 mm 1.00" / 25 mm  2.00" / 51 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 51,288 shp / 38,261 Kw = 35.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 415 tons

Complement:
 149 - 195

Cost:
 £0.335 million / $1.341 million

Distribution of weights at normal displacement:
 Armament: 79 tons, 3.9 %
 Armour: 32 tons, 1.6 %
    - Belts: 0 tons, 0.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 32 tons, 1.6 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 1,017 tons, 50.6 %
 Hull, fittings & equipment: 636 tons, 31.6 %
 Fuel, ammunition & stores: 293 tons, 14.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   594 lbs / 269 Kg = 9.5 x 5.0 " / 127 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.34
 Metacentric height 2.1 ft / 0.6 m
 Roll period: 11.5 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.29
 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): 0.376 / 0.388
 Length to Beam Ratio: 9.75 : 1
 'Natural speed' for length: 19.75 kts
 Power going to wave formation at top speed: 66 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 8.00 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,  21.00 ft / 6.40 m
    - Forward deck: 20.00 %,  21.00 ft / 6.40 m,  21.00 ft / 6.40 m
    - Aft deck: 45.00 %,  13.00 ft / 3.96 m,  13.00 ft / 3.96 m
    - Quarter deck: 15.00 %,  13.00 ft / 3.96 m,  13.00 ft / 3.96 m
    - Average freeboard:  16.44 ft / 5.01 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 176.0 %
  - Above water (accommodation/working, high = better): 124.9 %
 Waterplane Area: 9,498 Square feet or 882 Square metres
 Displacement factor (Displacement / loading): 73 %
 Structure weight / hull surface area: 36 lbs/sq ft or 178 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.45
  - Longitudinal: 1.58
  - Overall: 0.51
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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