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Friday, June 15, 2007

Destroyers in Springsharp 3.0b1 Beta

One question that came to mind is if you can just accept the fact that destroyers will have a hard time in heavy weather and accept a seakeeping standard where they have less than 1.0 seakeeping in Springsharp 3.0b1. I have not been willing to do that, but the idea seems worth some experimentation. I have a design for the Ger/CS/1905 Mod.A scout cruiser that has 3-6in guns and four 21in TT with reloads. with my usual methods, I had to accept a 34 knot speed and some modifications to the dimensions to have adequate strength and seakeeping. What I found is that with a 35 knot speed, the design has seakeeping of 0.89. This is the Springsharp report for the design with acceptable seakeeping:
Ger/CS/1905 Mod.A, Germany Scout Cruiser laid down 1905 (Engine 1950)

Displacement:
 2,028 t light; 2,103 t standard; 2,312 t normal; 2,479 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (372.95 ft / 370.00 ft) x 36.00 ft x (13.50 / 14.19 ft)
 (113.67 m / 112.78 m) x 10.97 m  x (4.11 / 4.32 m)

Armament:
      3 - 6.00" / 152 mm 50.0 cal guns - 114.33lbs / 51.86kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts , 1905 Model
   3 x Single mounts on centreline, evenly spread
   Aft Main mounts separated by engine room
 Weight of broadside 343 lbs / 343 kg
 4 - 21.0" / 533 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 2.00" / 51 mm 185.00 ft / 56.39 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 2.00" / 51 mm   90.00 ft / 27.43 m 8.00 ft / 2.44 m
   Main Belt covers 77 % of normal length
   Main belt does not fully cover magazines and engineering spaces

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

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 53,231 shp / 39,711 Kw = 34.00 kts
 Range 5,400nm at 14.00 kts
 Bunker at max displacement = 376 tons

Complement:
 166 - 216

Cost:
 £0.259 million / $1.036 million

Distribution of weights at normal displacement:
 Armament: 101 tons, 4.4 %
 Armour: 219 tons, 9.5 %
    - Belts: 201 tons, 8.7 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 18 tons, 0.8 %
    - Armour Deck: 0 tons, 0.0 %
    - Conning Tower: 0 tons, 0.0 %
 Machinery: 1,086 tons, 47.0 %
 Hull, fittings & equipment: 680 tons, 29.4 %
 Fuel, ammunition & stores: 284 tons, 12.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   684 lbs / 310 Kg = 6.3 x 6.0 " / 152 mm shells or 0.4 torpedoes
 Stability (Unstable if below 1.00): 1.23
 Metacentric height 1.6 ft / 0.5 m
 Roll period: 12.0 seconds
 Steadiness - As gun platform (Average = 50 %): 51 %
   - Recoil effect (Restricted arc if above 1.00): 0.40
 Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
 Hull has raised forecastle,
   a normal bow and a round stern
 Block coefficient (normal/deep): 0.450 / 0.459
 Length to Beam Ratio: 10.28 : 1
 'Natural speed' for length: 19.24 kts
 Power going to wave formation at top speed: 68 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 7.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 29.00 %,  24.00 ft / 7.32 m,  22.00 ft / 6.71 m
    - Forward deck: 30.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Aft deck: 26.00 %,  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:  16.55 ft / 5.05 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 166.0 %
  - Above water (accommodation/working, high = better): 108.2 %
 Waterplane Area: 8,496 Square feet or 789 Square metres
 Displacement factor (Displacement / loading): 74 %
 Structure weight / hull surface area: 38 lbs/sq ft or 186 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.51
  - Longitudinal: 2.22
  - Overall: 0.59
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is adequate

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