GB/CL/1925, Great Britain Light Cruiser laid down 1927 (Engine 1950) Displacement: 6,102 t light; 6,318 t standard; 6,720 t normal; 7,042 t full load Dimensions: Length overall / water x beam x draught 555.36 ft / 550.00 ft x 52.00 ft x 21.00 ft (normal load) 169.27 m / 167.64 m x 15.85 m x 6.40 m Armament: 8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1927 Model Dual purpose guns in turrets (on barbettes) on centreline ends, evenly spread, 2 raised mounts - superfiring 8 - 2.24" / 57.0 mm guns (4x2 guns), 5.65lbs / 2.56kg shells, 1927 Model Anti-aircraft guns in deck mounts with hoists on side, all amidships, all raised mounts - superfiring 16 - 1.57" / 40.0 mm guns (8x2 guns), 1.95lbs / 0.89kg shells, 1927 Model Anti-aircraft guns in deck mounts on side, evenly spread, 6 raised mounts Weight of broadside 940 lbs / 427 kg Shells per gun, main battery: 150 4 - 21.0" / 533.4 mm above water torpedoes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 1.00" / 25 mm 530.00 ft / 161.54 m 10.00 ft / 3.05 m Ends: Unarmoured Main Belt covers 148 % of normal length - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 1.00" / 25 mm 0.75" / 19 mm 0.75" / 19 mm - Armour deck: 0.75" / 19 mm, Conning tower: 1.00" / 25 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 103,563 shp / 77,258 Kw = 36.00 kts Range 4,500nm at 15.00 kts Bunker at max displacement = 724 tons Complement: 370 - 482 Cost: £2.397 million / $9.588 million Distribution of weights at normal displacement: Armament: 118 tons, 1.7 % Armour: 521 tons, 7.8 % - Belts: 205 tons, 3.0 % - Torpedo bulkhead: 0 tons, 0.0 % - Armament: 65 tons, 1.0 % - Armour Deck: 243 tons, 3.6 % - Conning Tower: 8 tons, 0.1 % Machinery: 2,478 tons, 36.9 % Hull, fittings & equipment: 2,986 tons, 44.4 % Fuel, ammunition & stores: 618 tons, 9.2 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 4,931 lbs / 2,237 Kg = 45.7 x 6.0 " / 152 mm shells or 0.9 torpedoes Stability (Unstable if below 1.00): 1.23 Metacentric height 2.7 ft / 0.8 m Roll period: 13.2 seconds Steadiness - As gun platform (Average = 50 %): 55 % - Recoil effect (Restricted arc if above 1.00): 0.39 Seaboat quality (Average = 1.00): 1.10 Hull form characteristics: Hull has rise forward of midbreak Block coefficient: 0.392 Length to Beam Ratio: 10.58 : 1 'Natural speed' for length: 23.45 kts Power going to wave formation at top speed: 59 % Trim (Max stability = 0, Max steadiness = 100): 50 Bow angle (Positive = bow angles forward): 5.00 degrees Stern overhang: 3.00 ft / 0.91 m Freeboard (% = measuring location as a percentage of overall length): - Stem: 27.00 ft / 8.23 m - Forecastle (20 %): 24.00 ft / 7.32 m - Mid (37 %): 24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break) - Quarterdeck (15 %): 16.00 ft / 4.88 m - Stern: 16.00 ft / 4.88 m - Average freeboard: 19.20 ft / 5.85 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 133.0 % - Above water (accommodation/working, high = better): 147.5 % Waterplane Area: 17,527 Square feet or 1,628 Square metres Displacement factor (Displacement / loading): 105 % Structure weight / hull surface area: 93 lbs/sq ft or 455 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.92 - Longitudinal: 2.04 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Friday, November 18, 2005
A better protected GB/CL/1927
I failed at achieving 36.5 knots, but I was able to add more protection, partly by reducing some, so that I could have a 1in belt that covers a good bit of side. The range is less, but this seemed to be an improvement. Adding the belt improved seakeeping! This is the Springsharp report:
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