GB/CA/1921, Great Britain Heavy Cruiser laid down 1921 Displacement: 13,824 t light; 14,377 t standard; 15,600 t normal; 16,579 t full load Dimensions: Length overall / water x beam x draught 627.03 ft / 625.00 ft x 63.00 ft x 23.00 ft (normal load) 191.12 m / 190.50 m x 19.20 m x 7.01 m Armament: 9 - 8.00" / 203 mm guns (3x3 guns), 256.00lbs / 116.12kg shells, 1921 Model Breech loading guns in turrets (on barbettes) on centreline ends, majority forward, 1 raised mount - superfiring 8 - 4.70" / 119 mm guns (4x2 guns), 51.91lbs / 23.55kg shells, 1921 Model Dual purpose guns in deck mounts with hoists on side, all amidships 24 - 1.57" / 40.0 mm guns (6x4 guns), 2.00lbs / 0.91kg shells, 1921 Model Anti-aircraft guns in deck mounts on side, evenly spread 4 - 0.00" / 0.0 mm guns in single mounts, 0.00lbs / 0.00kg shells, 1921 Model Breech loading guns in deck mount on side, evenly spread Weight of broadside 2,767 lbs / 1,255 kg Shells per gun, main battery: 150 16 - 21.0" / 533.4 mm above water torpedoes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 4.00" / 102 mm 590.00 ft / 179.83 m 14.00 ft / 4.27 m Ends: Unarmoured Main Belt covers 145 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 1.00" / 25 mm 590.00 ft / 179.83 m 22.00 ft / 6.71 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 4.00" / 102 mm 3.00" / 76 mm 4.00" / 102 mm 2nd: 2.00" / 51 mm 2.00" / 51 mm 2.00" / 51 mm - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm Machinery: Oil fired boilers, steam turbines, Direct drive, 4 shafts, 129,200 shp / 96,383 Kw = 33.00 kts Range 6,500nm at 15.00 kts Bunker at max displacement = 2,202 tons Complement: 697 - 907 Cost: £3.556 million / $14.226 million Distribution of weights at normal displacement: Armament: 346 tons, 2.2 % Armour: 3,397 tons, 21.8 % - Belts: 1,303 tons, 8.4 % - Torpedo bulkhead: 480 tons, 3.1 % - Armament: 492 tons, 3.2 % - Armour Deck: 1,068 tons, 6.8 % - Conning Tower: 54 tons, 0.3 % Machinery: 4,449 tons, 28.5 % Hull, fittings & equipment: 5,632 tons, 36.1 % Fuel, ammunition & stores: 1,776 tons, 11.4 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 15,545 lbs / 7,051 Kg = 60.7 x 8.0 " / 203 mm shells or 2.0 torpedoes Stability (Unstable if below 1.00): 1.19 Metacentric height 3.4 ft / 1.0 m Roll period: 14.3 seconds Steadiness - As gun platform (Average = 50 %): 55 % - Recoil effect (Restricted arc if above 1.00): 0.61 Seaboat quality (Average = 1.00): 1.10 Hull form characteristics: Hull has a flush deck Block coefficient: 0.603 Length to Beam Ratio: 9.92 : 1 'Natural speed' for length: 25.00 kts Power going to wave formation at top speed: 60 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 4.00 degrees Stern overhang: -2.00 ft / -0.61 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 29.00 ft / 8.84 m - Forecastle (20 %): 23.00 ft / 7.01 m - Mid (67 %): 23.00 ft / 7.01 m - Quarterdeck (15 %): 23.00 ft / 7.01 m - Stern: 23.00 ft / 7.01 m - Average freeboard: 23.48 ft / 7.16 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 161.0 % - Above water (accommodation/working, high = better): 130.7 % Waterplane Area: 28,876 Square feet or 2,683 Square metres Displacement factor (Displacement / loading): 104 % Structure weight / hull surface area: 115 lbs/sq ft or 561 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.95 - Longitudinal: 1.59 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Sunday, December 18, 2005
The GB/CA/1921 design
I was greatly tempted to switch to light weight machinery, but I did not want to alter the series that way. I probably will try a new series with light weight machinery, to demonstrate the radical difference that I know it makes. The GB/CA/1921 does have a flush deck and triple 8in turrets, along with dual-purpose 4.7in guns. The speed is now 33 knots. The armour basis is still 4in and the deck is 2in. This is the Springsharp report:
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