Ger/CM/1914, Germany Cruiser Minelayer laid down 1914 (Engine 1950)
Displacement:
3,323 t light; 3,414 t standard; 3,733 t normal; 3,989 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(437.95 ft / 435.00 ft) x 38.00 ft x (17.00 / 17.81 ft)
(133.49 m / 132.59 m) x 11.58 m x (5.18 / 5.43 m)
Armament:
3 - 5.00" / 127 mm 45.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
Quick firing guns in deck and hoist mounts, 1914 Model
1 x Single mount on centreline forward
1 x Single mount on centreline, aft deck forward
Weight of broadside 195 lbs / 88 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,
Geared drive, 2 shafts, 99,257 shp / 74,046 Kw = 39.00 kts
Range 4,800nm at 15.00 kts
Bunker at max displacement = 575 tons
Complement:
238 - 310
Cost:
£0.562 million / $2.248 million
Distribution of weights at normal displacement:
Armament: 51 tons, 1.4 %
Armour: 31 tons, 0.8 %
- Armament: 31 tons, 0.8 %
Machinery: 2,195 tons, 58.8 %
Hull, fittings & equipment: 908 tons, 24.3 %
Fuel, ammunition & stores: 411 tons, 11.0 %
Miscellaneous weights: 138 tons, 3.7 %
- On freeboard deck: 138 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
740 lbs / 335 Kg = 11.8 x 5.0 " / 127 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.21
Metacentric height 1.7 ft / 0.5 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.25
Seaboat quality (Average = 1.00): 1.10
Hull form characteristics:
Hull has a flush deck,
a normal bow and large transom stern
Block coefficient (normal/deep): 0.465 / 0.474
Length to Beam Ratio: 11.45 : 1
'Natural speed' for length: 23.66 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 55
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: 20.00 %, 24.00 ft / 7.32 m, 22.00 ft / 6.71 m
- Forward deck: 25.00 %, 22.00 ft / 6.71 m, 20.00 ft / 6.10 m
- Aft deck: 40.00 %, 20.00 ft / 6.10 m, 18.00 ft / 5.49 m
- Quarter deck: 15.00 %, 18.00 ft / 5.49 m, 18.00 ft / 5.49 m
- Average freeboard: 20.11 ft / 6.13 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 194.2 %
- Above water (accommodation/working, high = better): 175.5 %
Waterplane Area: 11,095 Square feet or 1,031 Square metres
Displacement factor (Displacement / loading): 73 %
Structure weight / hull surface area: 36 lbs/sq ft or 173 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.42
- Longitudinal: 2.56
- Overall: 0.51
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
This is a forum for discussion of topics relating to the Dreadnought era, prior to the ascendency of naval aviation. We will be discussing history, ship design, and naval wargaming.
Friday, September 28, 2007
An alternative Ger/CM/1914 design
There is a sketch of the largest ship in the family of specifications for fast German minelayers. That ship is flush-decked. That inspired me to try a flush-decked alternative to what I last wrote about. This would be a Ger/CM/1914 that tries to have a more typical draft, or at least not an oddly deep draft. That is the main difference. The ship might well not have had the mines on the upper deck, but I kept them there. The Germans only used 5in guns in my alternate universe, of course. This is at least a more rational design, in my opinion, although not quite as fast:
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