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
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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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