Mercury, anachronistic version, Great Britain 2nd Class Cruiser laid down 1906 (Engine 1908) Displacement: 3,473 t light; 3,640 t standard; 4,250 t normal; 4,738 t full load Dimensions: Length overall / water x beam x draught 318.21 ft / 315.00 ft x 46.00 ft x 21.00 ft (normal load) 96.99 m / 96.01 m x 14.02 m x 6.40 m Armament: 8 - 5.00" / 127 mm guns (4x2 guns), 62.50lbs / 28.35kg shells, 1906 Model Quick firing guns in deck mounts with hoists on centreline ends, evenly spread, 2 raised mounts - superfiring 4 - 5.00" / 127 mm guns (2x2 guns), 62.50lbs / 28.35kg shells, 1906 Model Quick firing guns in deck mounts with hoists on side, all amidships 4 - 1.85" / 47.0 mm guns in single mounts, 3.17lbs / 1.44kg shells, 1906 Model Quick firing guns in deck mounts with hoists on side, all amidships, all raised mounts - superfiring Weight of broadside 763 lbs / 346 kg Shells per gun, main battery: 180 4 - 18.0" / 457.2 mm above water torpedoes Machinery: Coal fired boilers, complex reciprocating steam engines, Direct drive, 2 shafts, 21,380 ihp / 15,950 Kw = 24.00 kts Range 5,600nm at 12.00 kts Bunker at max displacement = 1,098 tons (100% coal) Complement: 263 - 342 Cost: £0.470 million / $1.880 million Distribution of weights at normal displacement: Armament: 95 tons, 2.2 % Machinery: 1,918 tons, 45.1 % Hull, fittings & equipment: 1,460 tons, 34.3 % Fuel, ammunition & stores: 777 tons, 18.3 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 1,895 lbs / 859 Kg = 30.3 x 5.0 " / 127 mm shells or 0.5 torpedoes Stability (Unstable if below 1.00): 1.16 Metacentric height 2.1 ft / 0.6 m Roll period: 13.5 seconds Steadiness - As gun platform (Average = 50 %): 100 % - Recoil effect (Restricted arc if above 1.00): 0.83 Seaboat quality (Average = 1.00): 1.67 Hull form characteristics: Hull has a flush deck Block coefficient: 0.489 Length to Beam Ratio: 6.85 : 1 'Natural speed' for length: 17.75 kts Power going to wave formation at top speed: 63 % Trim (Max stability = 0, Max steadiness = 100): 73 Bow angle (Positive = bow angles forward): 3.00 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 (20 %): 19.00 ft / 5.79 m - Mid (50 %): 19.00 ft / 5.79 m - Quarterdeck (15 %): 19.00 ft / 5.79 m - Stern: 19.00 ft / 5.79 m - Average freeboard: 19.32 ft / 5.89 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 163.5 % - Above water (accommodation/working, high = better): 113.1 % Waterplane Area: 9,557 Square feet or 888 Square metres Displacement factor (Displacement / loading): 91 % Structure weight / hull surface area: 76 lbs/sq ft or 369 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.82 - Longitudinal: 5.56 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is adequate Ship has slow, easy roll, a good, steady gun platform Excellent seaboat, comfortable, can fire her guns in the heaviest weather
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Thursday, January 25, 2007
My anachronistic Mercury cruiser
I have planned to try some of the early British cruisers as anachronistic Springsharp designs. Tonight, I tried a Mercury design. This is an unarmoured 2nd Class Cruiser. My ship has 12-5in QF guns and 4-47mm (3pdr) QF guns. The speed is a pretty fast 24 knots. My ship would have twin funnels and a rather high flush deck. I had to raise the freeboard to help increase the roll period to over 13 seconds. This is the Springsharp report:
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