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Thursday, August 30, 2007

My most successful Ger/DM/1913 design

My Ger/DM/1913 design would have had one ship built to it, named the Meteor, after the real German minelayer. The specifications are very demanding for the current state of the art Springsharp:
Ger/DM/1913  Meteor  

1600 tons   350ft x 36ft

2-6in guns and 250 mines   40,000 SHP = 35 knots

I had to have a draft that is too deep for a ship of that size and a freeboard that is rather high. Still, I have never been able to do this well:
Ger/DM/1913 Meteor, Germany Destroyer Minelayer laid down 1913 (Engine 1950)

Displacement:
 1,822 t light; 1,879 t standard; 2,022 t normal; 2,136 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (352.52 ft / 350.00 ft) x 36.00 ft x (13.00 / 13.49 ft)
 (107.45 m / 106.68 m) x 10.97 m  x (3.96 / 4.11 m)

Armament:
      2 - 6.00" / 152 mm 45.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Breech loading guns in deck and hoist mounts, 1913 Model
   1 x Single mount on centreline, forward deck forward
   1 x Single mount on centreline, aft deck forward
      Weight of broadside 200 lbs / 91 kg

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, 
 Direct drive, 2 shafts, 47,138 shp / 35,165 Kw = 35.00 kts
 Range 3,500nm at 14.00 kts
 Bunker at max displacement = 257 tons

Complement:
 149 - 195

Cost:
 £0.236 million / $0.943 million

Distribution of weights at normal displacement:
 Armament: 58 tons, 2.9 %
 Armour: 34 tons, 1.7 %
    - Armament: 34 tons, 1.7 %
 Machinery: 942 tons, 46.6 %
 Hull, fittings & equipment: 538 tons, 26.6 %
 Fuel, ammunition & stores: 200 tons, 9.9 %
 Miscellaneous weights: 250 tons, 12.4 %
    - On freeboard deck: 250 tons

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   628 lbs / 285 Kg = 5.8 x 6.0 " / 152 mm shells or 0.4 torpedoes
 Stability (Unstable if below 1.00): 1.10
 Metacentric height 1.3 ft / 0.4 m
 Roll period: 13.3 seconds
 Steadiness - As gun platform (Average = 50 %): 50 %
   - Recoil effect (Restricted arc if above 1.00): 0.32
 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): 0.432 / 0.440
 Length to Beam Ratio: 9.72 : 1
 'Natural speed' for length: 21.59 kts
 Power going to wave formation at top speed: 71 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 6.00 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: 15.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Aft deck: 50.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
    - Quarter deck: 15.00 %,  15.00 ft / 4.57 m,  15.00 ft / 4.57 m
    - Average freeboard:  17.61 ft / 5.37 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 159.9 %
  - Above water (accommodation/working, high = better): 174.8 %
 Waterplane Area: 8,228 Square feet or 764 Square metres
 Displacement factor (Displacement / loading): 74 %
 Structure weight / hull surface area: 32 lbs/sq ft or 158 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.43
  - Longitudinal: 2.76
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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