GB/CB/1905 Design Study, Enter country Enter ship type laid down 1905 (Engine 1910) Displacement: 22,796 t light; 23,601 t standard; 26,500 t normal; 28,819 t full load Dimensions: Length overall / water x beam x draught 770.00 ft / 770.00 ft x 85.00 ft x 26.00 ft (normal load) 234.70 m / 234.70 m x 25.91 m x 7.92 m Armament: 6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1905 Model Breech loading guns in turrets (on barbettes) on centreline ends, majority forward, 1 raised mount - superfiring 8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model Quick firing guns in deck mounts with hoists on side, all amidships Weight of broadside 6,048 lbs / 2,743 kg Shells per gun, main battery: 80 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 6.00" / 152 mm 540.00 ft / 164.59 m 8.00 ft / 2.44 m Ends: Unarmoured Upper: 4.00" / 102 mm 540.00 ft / 164.59 m 8.00 ft / 2.44 m Main Belt covers 108 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 2.00" / 51 mm 540.00 ft / 164.59 m 25.00 ft / 7.62 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 10.0" / 254 mm 4.00" / 102 mm 8.00" / 203 mm 2nd: 2.00" / 51 mm 2.00" / 51 mm 2.00" / 51 mm - Armour deck: 2.00" / 51 mm, Conning tower: 8.00" / 203 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 130,202 shp / 97,130 Kw = 31.20 kts Range 7,500nm at 15.00 kts Bunker at max displacement = 5,218 tons Complement: 1,038 - 1,350 Cost: £2.186 million / $8.744 million Distribution of weights at normal displacement: Armament: 756 tons, 2.9 % Armour: 5,948 tons, 22.4 % - Belts: 1,795 tons, 6.8 % - Torpedo bulkhead: 999 tons, 3.8 % - Armament: 1,318 tons, 5.0 % - Armour Deck: 1,682 tons, 6.3 % - Conning Tower: 153 tons, 0.6 % Machinery: 5,380 tons, 20.3 % Hull, fittings & equipment: 10,711 tons, 40.4 % Fuel, ammunition & stores: 3,704 tons, 14.0 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 38,534 lbs / 17,479 Kg = 44.6 x 12.0 " / 305 mm shells or 4.9 torpedoes Stability (Unstable if below 1.00): 1.17 Metacentric height 5.2 ft / 1.6 m Roll period: 15.6 seconds Steadiness - As gun platform (Average = 50 %): 74 % - Recoil effect (Restricted arc if above 1.00): 0.64 Seaboat quality (Average = 1.00): 1.48 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.545 Length to Beam Ratio: 9.06 : 1 'Natural speed' for length: 27.75 kts Power going to wave formation at top speed: 51 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): -2.00 degrees Stern overhang: -1.00 ft / -0.30 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 33.00 ft / 10.06 m - Forecastle (20 %): 30.00 ft / 9.14 m - Mid (67 %): 30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break) - Quarterdeck (15 %): 22.00 ft / 6.71 m - Stern: 22.00 ft / 6.71 m - Average freeboard: 27.60 ft / 8.41 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 114.4 % - Above water (accommodation/working, high = better): 231.8 % Waterplane Area: 45,465 Square feet or 4,224 Square metres Displacement factor (Displacement / loading): 116 % Structure weight / hull surface area: 152 lbs/sq ft or 743 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.96 - Longitudinal: 1.37 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent Ship has slow, easy roll, a good, steady gun platform Good seaboat, rides out heavy weather easily
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Saturday, August 27, 2005
I have a sheet that must go with a drawing I have seen for an alternate GB/CB/1905 design
This is more like what Frank Fox and David K. Brown had recommended to me in 2001. They had actually recommended 8-12in guns and a 6in belt, with less speed than 32 or 33 knots. This seems to be an alternate specification that would accompany a drawing I have seen for an alternate GB/CB/1905 design with 6-12in and 8-6in guns. The belt would be 4-6in and the speed would be 31.2knots. To achieve adequate hull strength, I needed to cheat in Springsharp and use lighter-weight machinery. The ship is very pleasant three twin turrets, the second in a superfiring position, a tripod foremast and twin funnels with the fore funnel raised. This is the Springsharp report:
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