Ger/CS/1905, Germany Scout Cruiser laid down 1905 (Engine 1945) Displacement: 2,373 t light; 2,446 t standard; 2,800 t normal; 3,083 t full load Dimensions: Length overall / water x beam x draught 371.75 ft / 370.00 ft x 38.00 ft x 13.50 ft (normal load) 113.31 m / 112.78 m x 11.58 m x 4.11 m Armament: 3 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model Breech loading guns in deck mounts with hoists on centreline, evenly spread Aft Main mounts separated by engine room 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, all amidships Weight of broadside 160 lbs / 73 kg Shells per gun, main battery: 180 2 - 18.0" / 457.2 mm above water torpedoes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 2.00" / 51 mm 220.00 ft / 67.06 m 8.00 ft / 2.44 m Ends: Unarmoured Upper: 2.00" / 51 mm 140.00 ft / 42.67 m 8.00 ft / 2.44 m Main Belt covers 91 % 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 - - - Conning tower: 3.00" / 76 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 2 shafts, 63,385 shp / 47,285 Kw = 34.00 kts Range 4,200nm at 18.00 kts Bunker at max displacement = 636 tons Complement: 192 - 250 Cost: £0.300 million / $1.198 million Distribution of weights at normal displacement: Armament: 20 tons, 0.7 % Armour: 276 tons, 9.9 % - Belts: 252 tons, 9.0 % - Torpedo bulkhead: 0 tons, 0.0 % - Armament: 11 tons, 0.4 % - Armour Deck: 0 tons, 0.0 % - Conning Tower: 13 tons, 0.5 % Machinery: 1,427 tons, 50.9 % Hull, fittings & equipment: 650 tons, 23.2 % Fuel, ammunition & stores: 427 tons, 15.3 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 802 lbs / 364 Kg = 25.1 x 4.0 " / 102 mm shells or 0.4 torpedoes Stability (Unstable if below 1.00): 1.46 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: 0.516 Length to Beam Ratio: 9.74 : 1 'Natural speed' for length: 19.24 kts Power going to wave formation at top speed: 71 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 4.00 degrees Stern overhang: 0.00 ft / 0.00 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 25.00 ft / 7.62 m - Forecastle (20 %): 23.00 ft / 7.01 m - Mid (36 %): 23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break) - Quarterdeck (15 %): 15.00 ft / 4.57 m - Stern: 15.00 ft / 4.57 m - Average freeboard: 18.04 ft / 5.50 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 170.3 % - Above water (accommodation/working, high = better): 148.6 % Waterplane Area: 9,509 Square feet or 883 Square metres Displacement factor (Displacement / loading): 77 % Structure weight / hull surface area: 33 lbs/sq ft or 161 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.44 - Longitudinal: 2.13 - Overall: 0.52 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Wednesday, August 02, 2006
The Ger/CS/1905 suffers from the usual Springsharp problems
Small, fast warships are in issue in Springsharp. I suspect that part of the issue is the empirical equation used to compute speed of power works best for large warships. I struggled to get the Ger/CS/1905 design to have adequate seakeeping, while accepting a lower speed than desired. The design wants a 36 knot speed, but I accepted a 34 knot speed to get an acceptable result. The ship has 5-4in QF guns and 2-18in TT. A complicating factor is the 2in armour to flash off hits form 12pdrs and similar hits. The designed dimensions are 370ft x 38ft x 13ft with a Standard displacement of 2,480 tons. This is the Springsharp report:
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