GB/CA/1906, Great Britain Armoured Cruiser laid down 1906 Displacement: 14,600 t light; 15,186 t standard; 16,800 t normal; 18,091 t full load Dimensions: Length overall / water x beam x draught 565.00 ft / 565.00 ft x 78.00 ft x 24.00 ft (normal load) 172.21 m / 172.21 m x 23.77 m x 7.32 m Armament: 8 - 9.20" / 234 mm guns (4x2 guns), 389.34lbs / 176.60kg shells, 1906 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread 16 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1906 Model Quick firing guns in casemate mounts on side, evenly spread, 4 raised mounts Weight of broadside 3,627 lbs / 1,645 kg Shells per gun, main battery: 120 4 - 21.0" / 533.4 mm above water torpedoes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 7.00" / 178 mm 370.00 ft / 112.78 m 17.00 ft / 5.18 m Ends: Unarmoured Main Belt covers 101 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 1.00" / 25 mm 370.00 ft / 112.78 m 23.00 ft / 7.01 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 7.00" / 178 mm 4.00" / 102 mm 7.00" / 178 mm 2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm - Armour deck: 2.00" / 51 mm, Conning tower: 7.00" / 178 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 64,156 shp / 47,860 Kw = 27.00 kts Range 4,400nm at 15.00 kts Bunker at max displacement = 2,904 tons Complement: 737 - 959 Cost: £1.475 million / $5.900 million Distribution of weights at normal displacement: Armament: 453 tons, 2.7 % Armour: 4,358 tons, 25.9 % - Belts: 1,893 tons, 11.3 % - Torpedo bulkhead: 315 tons, 1.9 % - Armament: 907 tons, 5.4 % - Armour Deck: 1,144 tons, 6.8 % - Conning Tower: 99 tons, 0.6 % Machinery: 4,166 tons, 24.8 % Hull, fittings & equipment: 5,623 tons, 33.5 % Fuel, ammunition & stores: 2,200 tons, 13.1 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 19,774 lbs / 8,969 Kg = 50.8 x 9.2 " / 234 mm shells or 2.6 torpedoes Stability (Unstable if below 1.00): 1.33 Metacentric height 5.7 ft / 1.7 m Roll period: 13.7 seconds Steadiness - As gun platform (Average = 50 %): 63 % - Recoil effect (Restricted arc if above 1.00): 0.30 Seaboat quality (Average = 1.00): 1.26 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.556 Length to Beam Ratio: 7.24 : 1 'Natural speed' for length: 23.77 kts Power going to wave formation at top speed: 55 % 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: 26.00 ft / 7.92 m - Forecastle (20 %): 23.00 ft / 7.01 m - Mid (67 %): 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: 20.60 ft / 6.28 m Ship tends to be wet forward Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 136.1 % - Above water (accommodation/working, high = better): 155.7 % Waterplane Area: 30,928 Square feet or 2,873 Square metres Displacement factor (Displacement / loading): 103 % Structure weight / hull surface area: 124 lbs/sq ft or 604 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.96 - Longitudinal: 1.49 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent Good seaboat, rides out heavy weather easily
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Monday, October 31, 2005
How about a fast 1906 Armoured Cruiser?
I thought that a fast 1906 armoured cruiser might be a way to better explore the ship design space. This is a 27-knot ship with 7in side armour and 8-9.2in guns. I lapsed back into my usual mode, so the ends are unarmoured and the side armour is a uniform 7in, 17ft high. I increased the length over my initial 545ft to 565ft. I am assuming that the main armament is in echelon, as sort of Indefatigable-like arrangement. I would think that there would be an 8-gun broadside possible, at least on some bearings. This is the Springsharp report:
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