Ger/CS/1905, Germany Scout Cruiser laid down 1905 (Engine 1931) Displacement: 2,127 t light; 2,189 t standard; 2,240 t normal; 2,282 t full load Dimensions: Length overall / water x beam x draught 370.84 ft / 370.00 ft x 38.00 ft x 13.00 ft (normal load) 113.03 m / 112.78 m x 11.58 m x 3.96 m Armament: 1 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model Quick firing gun in a deck mount with hoist on centreline forward 2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model Quick firing guns in deck mounts with hoists on side, evenly spread 2 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model Quick firing guns in deck mounts with hoists on centreline, all aft Weight of broadside 160 lbs / 73 kg Shells per gun, main battery: 160 2 - 18.0" / 457.2 mm above water torpedoes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 2.00" / 51 mm 135.00 ft / 41.15 m 15.00 ft / 4.57 m Ends: Unarmoured Main Belt covers 56 % of normal length Main belt does not fully cover magazines and engineering spaces - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 1.00" / 25 mm - - 2nd: 1.00" / 25 mm - - 3rd: 1.00" / 25 mm - - Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 58,875 shp / 43,921 Kw = 35.00 kts Range 2,000nm at 10.00 kts Bunker at max displacement = 93 tons Complement: 162 - 211 Cost: £0.273 million / $1.093 million Distribution of weights at normal displacement: Armament: 20 tons, 0.9 % Armour: 198 tons, 8.9 % - Belts: 188 tons, 8.4 % - Torpedo bulkhead: 0 tons, 0.0 % - Armament: 11 tons, 0.5 % - Armour Deck: 0 tons, 0.0 % - Conning Tower: 0 tons, 0.0 % Machinery: 1,300 tons, 58.0 % Hull, fittings & equipment: 608 tons, 27.1 % Fuel, ammunition & stores: 113 tons, 5.1 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 529 lbs / 240 Kg = 16.5 x 4.0 " / 102 mm shells or 0.3 torpedoes Stability (Unstable if below 1.00): 1.47 Metacentric height 2.3 ft / 0.7 m Roll period: 10.6 seconds Steadiness - As gun platform (Average = 50 %): 51 % - Recoil effect (Restricted arc if above 1.00): 0.15 Seaboat quality (Average = 1.00): 1.02 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.429 Length to Beam Ratio: 9.74 : 1 'Natural speed' for length: 19.24 kts Power going to wave formation at top speed: 69 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 2.00 degrees Stern overhang: 0.00 ft / 0.00 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 24.00 ft / 7.32 m - Forecastle (20 %): 22.00 ft / 6.71 m - Mid (36 %): 22.00 ft / 6.71 m (14.00 ft / 4.27 m aft of break) - Quarterdeck (15 %): 14.00 ft / 4.27 m - Stern: 14.00 ft / 4.27 m - Average freeboard: 17.04 ft / 5.19 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 194.2 % - Above water (accommodation/working, high = better): 153.7 % Waterplane Area: 8,822 Square feet or 820 Square metres Displacement factor (Displacement / loading): 58 % Structure weight / hull surface area: 34 lbs/sq ft or 166 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.45 - Longitudinal: 2.09 - Overall: 0.52 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Saturday, May 28, 2005
Since I'm redoing Springsharp designs, here is the Ger/CS/1905 scout cruiser
The main difference about this attempt at the Ger/CS/1905 design is that I have the armament located correctly in the design. It seems a necessity, now that I know how to do it. I was able to keep the draft from getting too great, although it still is, due to the need to get adequate structural strength. The dimensions are 370ft x 38ft x 13ft. The displacement is only 2,240 tons, which is too low. The intended normal displacement is 2,480 tons. The speed is not quite what I wanted, as it is just 35 knots, not 36. The cruising speed and range are too low, but the only way to do better is to have a better SHP/ton for the machinery. I'm already skewing the date to get it. At about 45SHP/ton, it is still much below the maximum output achieved by the British super-destroyer Swift, which could produce 60SHP/ton, and in the same time period as this design. This is the Springsharp report:
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