GB/CB/1905, Great Britain Battlecruiser laid down 1905 (Engine 1916) Displacement: 22,071 t light; 22,832 t standard; 25,295 t normal; 27,267 t full load Dimensions: Length overall / water x beam x draught 770.00 ft / 770.00 ft x 85.00 ft x 27.00 ft (normal load) 234.70 m / 234.70 m x 25.91 m x 8.23 m Armament: 4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1905 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread, all raised mounts 9 - 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 ends, majority aft, all raised mounts - superfiring Weight of broadside 4,428 lbs / 2,009 kg Shells per gun, main battery: 100 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 4.00" / 102 mm 510.00 ft / 155.45 m 21.00 ft / 6.40 m Ends: Unarmoured Main Belt covers 102 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 1.50" / 38 mm 510.00 ft / 155.45 m 25.00 ft / 7.62 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 9.00" / 229 mm 5.00" / 127 mm 8.00" / 203 mm 2nd: 1.00" / 25 mm - - - Armour deck: 2.50" / 64 mm, Conning tower: 9.00" / 229 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 154,764 shp / 115,454 Kw = 33.00 kts Range 8,500nm at 15.00 kts Bunker at max displacement = 4,435 tons Complement: 1,002 - 1,303 Cost: £2.045 million / $8.179 million Distribution of weights at normal displacement: Armament: 554 tons, 2.2 % Armour: 5,629 tons, 22.3 % - Belts: 1,793 tons, 7.1 % - Torpedo bulkhead: 708 tons, 2.8 % - Armament: 943 tons, 3.7 % - Armour Deck: 2,019 tons, 8.0 % - Conning Tower: 167 tons, 0.7 % Machinery: 5,766 tons, 22.8 % Hull, fittings & equipment: 10,122 tons, 40.0 % Fuel, ammunition & stores: 3,225 tons, 12.7 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 31,134 lbs / 14,122 Kg = 36.0 x 12.0 " / 305 mm shells or 4.1 torpedoes Stability (Unstable if below 1.00): 1.15 Metacentric height 5.1 ft / 1.6 m Roll period: 15.8 seconds Steadiness - As gun platform (Average = 50 %): 70 % - Recoil effect (Restricted arc if above 1.00): 0.44 Seaboat quality (Average = 1.00): 1.40 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.501 Length to Beam Ratio: 9.06 : 1 'Natural speed' for length: 27.75 kts Power going to wave formation at top speed: 53 % 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 (67 %): 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: 28.16 ft / 8.58 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 118.8 % - Above water (accommodation/working, high = better): 182.5 % Waterplane Area: 43,647 Square feet or 4,055 Square metres Displacement factor (Displacement / loading): 117 % Structure weight / hull surface area: 146 lbs/sq ft or 713 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.97 - Longitudinal: 1.43 - 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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Tuesday, February 01, 2005
If you allow for higher output machinery, the GB/CB/1905 is a supership
I adjusted the machinery date in Springsharp, so as to get a higher SHP/ton reading, and with that, the GB/CB/1905 works really well. I was actually able to add armor, and go with my revised speed of 33 knots. Frank Fox's advice was to have more and smaller caliber guns. David K. Brown had a similar comment, as well as suggesting that the belt be increased to 6in. I have posted on this subject before, but this is the first time that I have achieved a satisfactory design (essentially by cheating on power, but not unreasonably: 26.84 SHP/ton).
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