Ger/CL/1914, Germany Light Cruiser laid down 1914 (Engine 1933) Displacement: 3,820 t light; 3,957 t standard; 4,307 t normal; 4,588 t full load Dimensions: Length overall / water x beam x draught 437.80 ft / 435.00 ft x 43.00 ft x 20.00 ft (normal load) 133.44 m / 132.59 m x 13.11 m x 6.10 m Armament: 9 - 5.12" / 130 mm guns in single mounts, 67.03lbs / 30.41kg shells, 1914 Model Breech loading guns in deck mounts with hoists on side ends, majority forward, all raised mounts - superfiring Weight of broadside 603 lbs / 274 kg Shells per gun, main battery: 150 4 - 23.6" / 600.0001 mm above water torpedoes Armour: - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 2.00" / 51 mm - - - Armour deck: 2.00" / 51 mm, Conning tower: 3.00" / 76 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 54,846 shp / 40,915 Kw = 32.00 kts Range 4,500nm at 15.00 kts Bunker at max displacement = 632 tons Complement: 265 - 345 Cost: £0.536 million / $2.142 million Distribution of weights at normal displacement: Armament: 75 tons, 1.8 % Armour: 496 tons, 11.5 % - Belts: 0 tons, 0.0 % - Torpedo bulkhead: 0 tons, 0.0 % - Armament: 52 tons, 1.2 % - Armour Deck: 427 tons, 9.9 % - Conning Tower: 17 tons, 0.4 % Machinery: 1,598 tons, 37.1 % Hull, fittings & equipment: 1,651 tons, 38.3 % Fuel, ammunition & stores: 487 tons, 11.3 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 2,605 lbs / 1,182 Kg = 38.9 x 5.1 " / 130 mm shells or 0.7 torpedoes Stability (Unstable if below 1.00): 1.18 Metacentric height 1.9 ft / 0.6 m Roll period: 13.0 seconds Steadiness - As gun platform (Average = 50 %): 51 % - Recoil effect (Restricted arc if above 1.00): 0.42 Seaboat quality (Average = 1.00): 1.02 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.403 Length to Beam Ratio: 10.12 : 1 'Natural speed' for length: 20.86 kts Power going to wave formation at top speed: 60 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 2.00 degrees Stern overhang: 2.00 ft / 0.61 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 23.00 ft / 7.01 m - Forecastle (32 %): 21.00 ft / 6.40 m - Mid (32 %): 21.00 ft / 6.40 m (13.00 ft / 3.96 m aft of break) - Quarterdeck (15 %): 13.00 ft / 3.96 m - Stern: 13.00 ft / 3.96 m - Average freeboard: 15.82 ft / 4.82 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 133.7 % - Above water (accommodation/working, high = better): 87.7 % Waterplane Area: 11,534 Square feet or 1,072 Square metres Displacement factor (Displacement / loading): 100 % Structure weight / hull surface area: 75 lbs/sq ft or 368 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.92 - Longitudinal: 2.14 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is cramped
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Monday, January 31, 2005
My latest attempt at the Ger/CL/1914 design
The Ger/CL/1914 design is essentially a 3rd Class protected cruiser, whose sole protection is a 2in deck. That does some interesting things. For one, hull strength is easier to achieve. My current strategy for increasing hull strength while having a good seakeeping ability is to increase the draft. That will increase the composite strength by some amount. From there, I reduce the displacement to reduce the composite strength back to 1.0. That should increase the seakeeping ability. I keep doing that until I have a seakeeping ability above 1.0 along with adequate composite strength. As you can see, I increased the date on the engine, to get a better SHP/ton of machinery (to 34.32 SHP/ton). Real ships in 1914 actually were better than that. This is an issue with Springsharp that we can hope will be corrected.
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